更新至v0.9.6

.github/workflows/dotnet-desktop.yml

@@ -1,4 +1,4 @@
-name: Build and Release WinForms
+name: Build and Release
 
 on:
   push:

README.en.md

@@ -1,5 +1,7 @@
 # SpineViewer
 
+[![Build and Release](https://github.com/ww-rm/SpineViewer/actions/workflows/dotnet-desktop.yml/badge.svg)](https://github.com/ww-rm/SpineViewer/actions/workflows/dotnet-desktop.yml)
+
 [中文](README.md) | [English](README.en.md)
 
 A simple and user-friendly Spine file viewer and exporter.
@@ -19,6 +21,7 @@ Alternatively, you can download the zip package with the `SelfContained` suffix,
 ## Features
 
 - Supports viewing Spine files of different versions:
+    - [x] `v2.1.x`
     - [x] `v3.6.x`
     - [x] `v3.7.x`
     - [x] `v3.8.x`

README.md

@@ -1,5 +1,7 @@
 # SpineViewer
 
+[![Build and Release](https://github.com/ww-rm/SpineViewer/actions/workflows/dotnet-desktop.yml/badge.svg)](https://github.com/ww-rm/SpineViewer/actions/workflows/dotnet-desktop.yml)
+
 [中文](README.md) | [English](README.en.md)
 
 一个简单好用的 Spine 文件查看&导出程序.
@@ -19,6 +21,7 @@
 ## 功能
 
 - 支持不同版本 Spine 查看
+    - [x] `v2.1.x`
     - [x] `v3.6.x`
     - [x] `v3.7.x`
     - [x] `v3.8.x`

SpineRuntimes/SpineRuntime21/Animation.cs

@@ -0,0 +1,723 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	public class Animation {
+		internal List<Timeline> timelines;
+		internal float duration;
+		internal String name;
+
+		public String Name { get { return name; } }
+		public List<Timeline> Timelines { get { return timelines; } set { timelines = value; } }
+		public float Duration { get { return duration; } set { duration = value; } }
+
+		public Animation (String name, List<Timeline> timelines, float duration) {
+			if (name == null) throw new ArgumentNullException("name cannot be null.");
+			if (timelines == null) throw new ArgumentNullException("timelines cannot be null.");
+			this.name = name;
+			this.timelines = timelines;
+			this.duration = duration;
+		}
+
+		/// <summary>Poses the skeleton at the specified time for this animation.</summary>
+		/// <param name="lastTime">The last time the animation was applied.</param>
+		/// <param name="events">Any triggered events are added.</param>
+		public void Apply (Skeleton skeleton, float lastTime, float time, bool loop, List<Event> events) {
+			if (skeleton == null) throw new ArgumentNullException("skeleton cannot be null.");
+
+			if (loop && duration != 0) {
+				time %= duration;
+				lastTime %= duration;
+			}
+
+			List<Timeline> timelines = this.timelines;
+			for (int i = 0, n = timelines.Count; i < n; i++)
+				timelines[i].Apply(skeleton, lastTime, time, events, 1);
+		}
+
+		/// <summary>Poses the skeleton at the specified time for this animation mixed with the current pose.</summary>
+		/// <param name="lastTime">The last time the animation was applied.</param>
+		/// <param name="events">Any triggered events are added.</param>
+		/// <param name="alpha">The amount of this animation that affects the current pose.</param>
+		public void Mix (Skeleton skeleton, float lastTime, float time, bool loop, List<Event> events, float alpha) {
+			if (skeleton == null) throw new ArgumentNullException("skeleton cannot be null.");
+
+			if (loop && duration != 0) {
+				time %= duration;
+				lastTime %= duration;
+			}
+
+			List<Timeline> timelines = this.timelines;
+			for (int i = 0, n = timelines.Count; i < n; i++)
+				timelines[i].Apply(skeleton, lastTime, time, events, alpha);
+		}
+
+		/// <param name="target">After the first and before the last entry.</param>
+		internal static int binarySearch (float[] values, float target, int step) {
+			int low = 0;
+			int high = values.Length / step - 2;
+			if (high == 0) return step;
+			int current = (int)((uint)high >> 1);
+			while (true) {
+				if (values[(current + 1) * step] <= target)
+					low = current + 1;
+				else
+					high = current;
+				if (low == high) return (low + 1) * step;
+				current = (int)((uint)(low + high) >> 1);
+			}
+		}
+
+		/// <param name="target">After the first and before the last entry.</param>
+		internal static int binarySearch (float[] values, float target) {
+			int low = 0;
+			int high = values.Length - 2;
+			if (high == 0) return 1;
+			int current = (int)((uint)high >> 1);
+			while (true) {
+				if (values[(current + 1)] <= target)
+					low = current + 1;
+				else
+					high = current;
+				if (low == high) return (low + 1);
+				current = (int)((uint)(low + high) >> 1);
+			}
+		}
+
+		internal static int linearSearch (float[] values, float target, int step) {
+			for (int i = 0, last = values.Length - step; i <= last; i += step)
+				if (values[i] > target) return i;
+			return -1;
+		}
+	}
+
+	public interface Timeline {
+		/// <summary>Sets the value(s) for the specified time.</summary>
+		/// <param name="events">May be null to not collect fired events.</param>
+		void Apply (Skeleton skeleton, float lastTime, float time, List<Event> events, float alpha);
+	}
+
+	/// <summary>Base class for frames that use an interpolation bezier curve.</summary>
+	abstract public class CurveTimeline : Timeline {
+		protected const float LINEAR = 0, STEPPED = 1, BEZIER = 2;
+		protected const int BEZIER_SEGMENTS = 10, BEZIER_SIZE = BEZIER_SEGMENTS * 2 - 1;
+
+		private float[] curves; // type, x, y, ...
+		public int FrameCount { get { return curves.Length / BEZIER_SIZE + 1; } }
+
+		public CurveTimeline (int frameCount) {
+			curves = new float[(frameCount - 1) * BEZIER_SIZE];
+		}
+
+		abstract public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha);
+
+		public void SetLinear (int frameIndex) {
+			curves[frameIndex * BEZIER_SIZE] = LINEAR;
+		}
+
+		public void SetStepped (int frameIndex) {
+			curves[frameIndex * BEZIER_SIZE] = STEPPED;
+		}
+
+		/// <summary>Sets the control handle positions for an interpolation bezier curve used to transition from this keyframe to the next.
+		/// cx1 and cx2 are from 0 to 1, representing the percent of time between the two keyframes. cy1 and cy2 are the percent of
+		/// the difference between the keyframe's values.</summary>
+		public void SetCurve (int frameIndex, float cx1, float cy1, float cx2, float cy2) {
+			float subdiv1 = 1f / BEZIER_SEGMENTS, subdiv2 = subdiv1 * subdiv1, subdiv3 = subdiv2 * subdiv1;
+			float pre1 = 3 * subdiv1, pre2 = 3 * subdiv2, pre4 = 6 * subdiv2, pre5 = 6 * subdiv3;
+			float tmp1x = -cx1 * 2 + cx2, tmp1y = -cy1 * 2 + cy2, tmp2x = (cx1 - cx2) * 3 + 1, tmp2y = (cy1 - cy2) * 3 + 1;
+			float dfx = cx1 * pre1 + tmp1x * pre2 + tmp2x * subdiv3, dfy = cy1 * pre1 + tmp1y * pre2 + tmp2y * subdiv3;
+			float ddfx = tmp1x * pre4 + tmp2x * pre5, ddfy = tmp1y * pre4 + tmp2y * pre5;
+			float dddfx = tmp2x * pre5, dddfy = tmp2y * pre5;
+
+			int i = frameIndex * BEZIER_SIZE;
+			float[] curves = this.curves;
+			curves[i++] = BEZIER;
+
+			float x = dfx, y = dfy;
+			for (int n = i + BEZIER_SIZE - 1; i < n; i += 2) {
+				curves[i] = x;
+				curves[i + 1] = y;
+				dfx += ddfx;
+				dfy += ddfy;
+				ddfx += dddfx;
+				ddfy += dddfy;
+				x += dfx;
+				y += dfy;
+			}
+		}
+
+		public float GetCurvePercent (int frameIndex, float percent) {
+			float[] curves = this.curves;
+			int i = frameIndex * BEZIER_SIZE;
+			float type = curves[i];
+			if (type == LINEAR) return percent;
+			if (type == STEPPED) return 0;
+			i++;
+			float x = 0;
+			for (int start = i, n = i + BEZIER_SIZE - 1; i < n; i += 2) {
+				x = curves[i];
+				if (x >= percent) {
+					float prevX, prevY;
+					if (i == start) {
+						prevX = 0;
+						prevY = 0;
+					} else {
+						prevX = curves[i - 2];
+						prevY = curves[i - 1];
+					}
+					return prevY + (curves[i + 1] - prevY) * (percent - prevX) / (x - prevX);
+				}
+			}
+			float y = curves[i - 1];
+			return y + (1 - y) * (percent - x) / (1 - x); // Last point is 1,1.
+		}
+		public float GetCurveType (int frameIndex) {
+			return curves[frameIndex * BEZIER_SIZE];
+		}
+	}
+
+	public class RotateTimeline : CurveTimeline {
+		protected const int PREV_FRAME_TIME = -2;
+		protected const int FRAME_VALUE = 1;
+
+		internal int boneIndex;
+		internal float[] frames;
+
+		public int BoneIndex { get { return boneIndex; } set { boneIndex = value; } }
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, value, ...
+
+		public RotateTimeline (int frameCount)
+			: base(frameCount) {
+			frames = new float[frameCount << 1];
+		}
+
+		/// <summary>Sets the time and value of the specified keyframe.</summary>
+		public void SetFrame (int frameIndex, float time, float angle) {
+			frameIndex *= 2;
+			frames[frameIndex] = time;
+			frames[frameIndex + 1] = angle;
+		}
+
+		override public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			float[] frames = this.frames;
+			if (time < frames[0]) return; // Time is before first frame.
+
+			Bone bone = skeleton.bones[boneIndex];
+
+			float amount;
+
+			if (time >= frames[frames.Length - 2]) { // Time is after last frame.
+				amount = bone.data.rotation + frames[frames.Length - 1] - bone.rotation;
+				while (amount > 180)
+					amount -= 360;
+				while (amount < -180)
+					amount += 360;
+				bone.rotation += amount * alpha;
+				return;
+			}
+
+			// Interpolate between the previous frame and the current frame.
+			int frameIndex = Animation.binarySearch(frames, time, 2);
+			float prevFrameValue = frames[frameIndex - 1];
+			float frameTime = frames[frameIndex];
+			float percent = 1 - (time - frameTime) / (frames[frameIndex + PREV_FRAME_TIME] - frameTime);
+			percent = GetCurvePercent((frameIndex >> 1) - 1, percent < 0 ? 0 : (percent > 1 ? 1 : percent));
+
+			amount = frames[frameIndex + FRAME_VALUE] - prevFrameValue;
+			while (amount > 180)
+				amount -= 360;
+			while (amount < -180)
+				amount += 360;
+			amount = bone.data.rotation + (prevFrameValue + amount * percent) - bone.rotation;
+			while (amount > 180)
+				amount -= 360;
+			while (amount < -180)
+				amount += 360;
+			bone.rotation += amount * alpha;
+		}
+	}
+
+	public class TranslateTimeline : CurveTimeline {
+		protected const int PREV_FRAME_TIME = -3;
+		protected const int FRAME_X = 1;
+		protected const int FRAME_Y = 2;
+
+		internal int boneIndex;
+		internal float[] frames;
+
+		public int BoneIndex { get { return boneIndex; } set { boneIndex = value; } }
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, value, value, ...
+
+		public TranslateTimeline (int frameCount)
+			: base(frameCount) {
+			frames = new float[frameCount * 3];
+		}
+
+		/// <summary>Sets the time and value of the specified keyframe.</summary>
+		public void SetFrame (int frameIndex, float time, float x, float y) {
+			frameIndex *= 3;
+			frames[frameIndex] = time;
+			frames[frameIndex + 1] = x;
+			frames[frameIndex + 2] = y;
+		}
+
+		override public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			float[] frames = this.frames;
+			if (time < frames[0]) return; // Time is before first frame.
+
+			Bone bone = skeleton.bones[boneIndex];
+
+			if (time >= frames[frames.Length - 3]) { // Time is after last frame.
+				bone.x += (bone.data.x + frames[frames.Length - 2] - bone.x) * alpha;
+				bone.y += (bone.data.y + frames[frames.Length - 1] - bone.y) * alpha;
+				return;
+			}
+
+			// Interpolate between the previous frame and the current frame.
+			int frameIndex = Animation.binarySearch(frames, time, 3);
+			float prevFrameX = frames[frameIndex - 2];
+			float prevFrameY = frames[frameIndex - 1];
+			float frameTime = frames[frameIndex];
+			float percent = 1 - (time - frameTime) / (frames[frameIndex + PREV_FRAME_TIME] - frameTime);
+			percent = GetCurvePercent(frameIndex / 3 - 1, percent < 0 ? 0 : (percent > 1 ? 1 : percent));
+
+			bone.x += (bone.data.x + prevFrameX + (frames[frameIndex + FRAME_X] - prevFrameX) * percent - bone.x) * alpha;
+			bone.y += (bone.data.y + prevFrameY + (frames[frameIndex + FRAME_Y] - prevFrameY) * percent - bone.y) * alpha;
+		}
+	}
+
+	public class ScaleTimeline : TranslateTimeline {
+		public ScaleTimeline (int frameCount)
+			: base(frameCount) {
+		}
+
+		override public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			float[] frames = this.frames;
+			if (time < frames[0]) return; // Time is before first frame.
+
+			Bone bone = skeleton.bones[boneIndex];
+			if (time >= frames[frames.Length - 3]) { // Time is after last frame.
+				bone.scaleX += (bone.data.scaleX * frames[frames.Length - 2] - bone.scaleX) * alpha;
+				bone.scaleY += (bone.data.scaleY * frames[frames.Length - 1] - bone.scaleY) * alpha;
+				return;
+			}
+
+			// Interpolate between the previous frame and the current frame.
+			int frameIndex = Animation.binarySearch(frames, time, 3);
+			float prevFrameX = frames[frameIndex - 2];
+			float prevFrameY = frames[frameIndex - 1];
+			float frameTime = frames[frameIndex];
+			float percent = 1 - (time - frameTime) / (frames[frameIndex + PREV_FRAME_TIME] - frameTime);
+			percent = GetCurvePercent(frameIndex / 3 - 1, percent < 0 ? 0 : (percent > 1 ? 1 : percent));
+
+			bone.scaleX += (bone.data.scaleX * (prevFrameX + (frames[frameIndex + FRAME_X] - prevFrameX) * percent) - bone.scaleX) * alpha;
+			bone.scaleY += (bone.data.scaleY * (prevFrameY + (frames[frameIndex + FRAME_Y] - prevFrameY) * percent) - bone.scaleY) * alpha;
+		}
+	}
+
+	public class ColorTimeline : CurveTimeline {
+		protected const int PREV_FRAME_TIME = -5;
+		protected const int FRAME_R = 1;
+		protected const int FRAME_G = 2;
+		protected const int FRAME_B = 3;
+		protected const int FRAME_A = 4;
+
+		internal int slotIndex;
+		internal float[] frames;
+
+		public int SlotIndex { get { return slotIndex; } set { slotIndex = value; } }
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, r, g, b, a, ...
+
+		public ColorTimeline (int frameCount)
+			: base(frameCount) {
+			frames = new float[frameCount * 5];
+		}
+
+		/// <summary>Sets the time and value of the specified keyframe.</summary>
+		public void SetFrame (int frameIndex, float time, float r, float g, float b, float a) {
+			frameIndex *= 5;
+			frames[frameIndex] = time;
+			frames[frameIndex + 1] = r;
+			frames[frameIndex + 2] = g;
+			frames[frameIndex + 3] = b;
+			frames[frameIndex + 4] = a;
+		}
+
+		override public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			float[] frames = this.frames;
+			if (time < frames[0]) return; // Time is before first frame.
+
+			float r, g, b, a;
+			if (time >= frames[frames.Length - 5]) {
+				// Time is after last frame.
+				int i = frames.Length - 1;
+				r = frames[i - 3];
+				g = frames[i - 2];
+				b = frames[i - 1];
+				a = frames[i];
+			} else {
+				// Interpolate between the previous frame and the current frame.
+				int frameIndex = Animation.binarySearch(frames, time, 5);
+				float prevFrameR = frames[frameIndex - 4];
+				float prevFrameG = frames[frameIndex - 3];
+				float prevFrameB = frames[frameIndex - 2];
+				float prevFrameA = frames[frameIndex - 1];
+				float frameTime = frames[frameIndex];
+				float percent = 1 - (time - frameTime) / (frames[frameIndex + PREV_FRAME_TIME] - frameTime);
+				percent = GetCurvePercent(frameIndex / 5 - 1, percent < 0 ? 0 : (percent > 1 ? 1 : percent));
+
+				r = prevFrameR + (frames[frameIndex + FRAME_R] - prevFrameR) * percent;
+				g = prevFrameG + (frames[frameIndex + FRAME_G] - prevFrameG) * percent;
+				b = prevFrameB + (frames[frameIndex + FRAME_B] - prevFrameB) * percent;
+				a = prevFrameA + (frames[frameIndex + FRAME_A] - prevFrameA) * percent;
+			}
+			Slot slot = skeleton.slots[slotIndex];
+			if (alpha < 1) {
+				slot.r += (r - slot.r) * alpha;
+				slot.g += (g - slot.g) * alpha;
+				slot.b += (b - slot.b) * alpha;
+				slot.a += (a - slot.a) * alpha;
+			} else {
+				slot.r = r;
+				slot.g = g;
+				slot.b = b;
+				slot.a = a;
+			}
+		}
+	}
+
+	public class AttachmentTimeline : Timeline {
+		internal int slotIndex;
+		internal float[] frames;
+		private String[] attachmentNames;
+
+		public int SlotIndex { get { return slotIndex; } set { slotIndex = value; } }
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, ...
+		public String[] AttachmentNames { get { return attachmentNames; } set { attachmentNames = value; } }
+		public int FrameCount { get { return frames.Length; } }
+
+		public AttachmentTimeline (int frameCount) {
+			frames = new float[frameCount];
+			attachmentNames = new String[frameCount];
+		}
+
+		/// <summary>Sets the time and value of the specified keyframe.</summary>
+		public void SetFrame (int frameIndex, float time, String attachmentName) {
+			frames[frameIndex] = time;
+			attachmentNames[frameIndex] = attachmentName;
+		}
+
+		public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			float[] frames = this.frames;
+			if (time < frames[0]) {
+				if (lastTime > time) Apply(skeleton, lastTime, int.MaxValue, null, 0);
+				return;
+			} else if (lastTime > time) //
+				lastTime = -1;
+
+			int frameIndex = (time >= frames[frames.Length - 1] ? frames.Length : Animation.binarySearch(frames, time)) - 1;
+			if (frames[frameIndex] < lastTime) return;
+
+			String attachmentName = attachmentNames[frameIndex];
+			skeleton.slots[slotIndex].Attachment =
+				 attachmentName == null ? null : skeleton.GetAttachment(slotIndex, attachmentName);
+		}
+	}
+
+	public class EventTimeline : Timeline {
+		internal float[] frames;
+		private Event[] events;
+
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, ...
+		public Event[] Events { get { return events; } set { events = value; } }
+		public int FrameCount { get { return frames.Length; } }
+
+		public EventTimeline (int frameCount) {
+			frames = new float[frameCount];
+			events = new Event[frameCount];
+		}
+
+		/// <summary>Sets the time and value of the specified keyframe.</summary>
+		public void SetFrame (int frameIndex, float time, Event e) {
+			frames[frameIndex] = time;
+			events[frameIndex] = e;
+		}
+
+		/// <summary>Fires events for frames > lastTime and <= time.</summary>
+		public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			if (firedEvents == null) return;
+			float[] frames = this.frames;
+			int frameCount = frames.Length;
+
+			if (lastTime > time) { // Fire events after last time for looped animations.
+				Apply(skeleton, lastTime, int.MaxValue, firedEvents, alpha);
+				lastTime = -1f;
+			} else if (lastTime >= frames[frameCount - 1]) // Last time is after last frame.
+				return;
+			if (time < frames[0]) return; // Time is before first frame.
+
+			int frameIndex;
+			if (lastTime < frames[0])
+				frameIndex = 0;
+			else {
+				frameIndex = Animation.binarySearch(frames, lastTime);
+				float frame = frames[frameIndex];
+				while (frameIndex > 0) { // Fire multiple events with the same frame.
+					if (frames[frameIndex - 1] != frame) break;
+					frameIndex--;
+				}
+			}
+			for (; frameIndex < frameCount && time >= frames[frameIndex]; frameIndex++)
+				firedEvents.Add(events[frameIndex]);
+		}
+	}
+
+	public class DrawOrderTimeline : Timeline {
+		internal float[] frames;
+		private int[][] drawOrders;
+
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, ...
+		public int[][] DrawOrders { get { return drawOrders; } set { drawOrders = value; } }
+		public int FrameCount { get { return frames.Length; } }
+
+		public DrawOrderTimeline (int frameCount) {
+			frames = new float[frameCount];
+			drawOrders = new int[frameCount][];
+		}
+
+		/// <summary>Sets the time and value of the specified keyframe.</summary>
+		/// <param name="drawOrder">May be null to use bind pose draw order.</param>
+		public void SetFrame (int frameIndex, float time, int[] drawOrder) {
+			frames[frameIndex] = time;
+			drawOrders[frameIndex] = drawOrder;
+		}
+
+		public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			float[] frames = this.frames;
+			if (time < frames[0]) return; // Time is before first frame.
+
+			int frameIndex;
+			if (time >= frames[frames.Length - 1]) // Time is after last frame.
+				frameIndex = frames.Length - 1;
+			else
+				frameIndex = Animation.binarySearch(frames, time) - 1;
+
+			List<Slot> drawOrder = skeleton.drawOrder;
+			List<Slot> slots = skeleton.slots;
+			int[] drawOrderToSetupIndex = drawOrders[frameIndex];
+			if (drawOrderToSetupIndex == null) {
+				drawOrder.Clear();
+				drawOrder.AddRange(slots);
+			} else {
+				for (int i = 0, n = drawOrderToSetupIndex.Length; i < n; i++)
+					drawOrder[i] = slots[drawOrderToSetupIndex[i]];
+			}
+		}
+	}
+
+	public class FFDTimeline : CurveTimeline {
+		internal int slotIndex;
+		internal float[] frames;
+		private float[][] frameVertices;
+		internal Attachment attachment;
+
+		public int SlotIndex { get { return slotIndex; } set { slotIndex = value; } }
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, ...
+		public float[][] Vertices { get { return frameVertices; } set { frameVertices = value; } }
+		public Attachment Attachment { get { return attachment; } set { attachment = value; } }
+
+		public FFDTimeline (int frameCount)
+			: base(frameCount) {
+			frames = new float[frameCount];
+			frameVertices = new float[frameCount][];
+		}
+
+		/// <summary>Sets the time and value of the specified keyframe.</summary>
+		public void SetFrame (int frameIndex, float time, float[] vertices) {
+			frames[frameIndex] = time;
+			frameVertices[frameIndex] = vertices;
+		}
+
+		override public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			Slot slot = skeleton.slots[slotIndex];
+			if (slot.attachment != attachment) return;
+
+			float[] frames = this.frames;
+			if (time < frames[0]) return; // Time is before first frame.
+
+			float[][] frameVertices = this.frameVertices;
+			int vertexCount = frameVertices[0].Length;
+
+			float[] vertices = slot.attachmentVertices;
+			if (vertices.Length < vertexCount) {
+				vertices = new float[vertexCount];
+				slot.attachmentVertices = vertices;
+			}
+			if (vertices.Length != vertexCount) alpha = 1; // Don't mix from uninitialized slot vertices.
+			slot.attachmentVerticesCount = vertexCount;
+
+			if (time >= frames[frames.Length - 1]) { // Time is after last frame.
+				float[] lastVertices = frameVertices[frames.Length - 1];
+				if (alpha < 1) {
+					for (int i = 0; i < vertexCount; i++) {
+						float vertex = vertices[i];
+						vertices[i] = vertex + (lastVertices[i] - vertex) * alpha;
+					}
+				} else
+					Array.Copy(lastVertices, 0, vertices, 0, vertexCount);
+				return;
+			}
+
+			// Interpolate between the previous frame and the current frame.
+			int frameIndex = Animation.binarySearch(frames, time);
+			float frameTime = frames[frameIndex];
+			float percent = 1 - (time - frameTime) / (frames[frameIndex - 1] - frameTime);
+			percent = GetCurvePercent(frameIndex - 1, percent < 0 ? 0 : (percent > 1 ? 1 : percent));
+
+			float[] prevVertices = frameVertices[frameIndex - 1];
+			float[] nextVertices = frameVertices[frameIndex];
+
+			if (alpha < 1) {
+				for (int i = 0; i < vertexCount; i++) {
+					float prev = prevVertices[i];
+					float vertex = vertices[i];
+					vertices[i] = vertex + (prev + (nextVertices[i] - prev) * percent - vertex) * alpha;
+				}
+			} else {
+				for (int i = 0; i < vertexCount; i++) {
+					float prev = prevVertices[i];
+					vertices[i] = prev + (nextVertices[i] - prev) * percent;
+				}
+			}
+		}
+	}
+
+	public class IkConstraintTimeline : CurveTimeline {
+		private const int PREV_FRAME_TIME = -3;
+		private const int PREV_FRAME_MIX = -2;
+		private const int PREV_FRAME_BEND_DIRECTION = -1;
+		private const int FRAME_MIX = 1;
+
+		internal int ikConstraintIndex;
+		internal float[] frames;
+
+		public int IkConstraintIndex { get { return ikConstraintIndex; } set { ikConstraintIndex = value; } }
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, mix, bendDirection, ...
+
+		public IkConstraintTimeline (int frameCount)
+			: base(frameCount) {
+			frames = new float[frameCount * 3];
+		}
+
+		/** Sets the time, mix and bend direction of the specified keyframe. */
+		public void SetFrame (int frameIndex, float time, float mix, int bendDirection) {
+			frameIndex *= 3;
+			frames[frameIndex] = time;
+			frames[frameIndex + 1] = mix;
+			frames[frameIndex + 2] = bendDirection;
+		}
+
+		override public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			float[] frames = this.frames;
+			if (time < frames[0]) return; // Time is before first frame.
+
+			IkConstraint ikConstraint = skeleton.ikConstraints[ikConstraintIndex];
+
+			if (time >= frames[frames.Length - 3]) { // Time is after last frame.
+				ikConstraint.mix += (frames[frames.Length - 2] - ikConstraint.mix) * alpha;
+				ikConstraint.bendDirection = (int)frames[frames.Length - 1];
+				return;
+			}
+
+			// Interpolate between the previous frame and the current frame.
+			int frameIndex = Animation.binarySearch(frames, time, 3);
+			float prevFrameMix = frames[frameIndex + PREV_FRAME_MIX];
+			float frameTime = frames[frameIndex];
+			float percent = 1 - (time - frameTime) / (frames[frameIndex + PREV_FRAME_TIME] - frameTime);
+			percent = GetCurvePercent(frameIndex / 3 - 1, percent < 0 ? 0 : (percent > 1 ? 1 : percent));
+
+			float mix = prevFrameMix + (frames[frameIndex + FRAME_MIX] - prevFrameMix) * percent;
+			ikConstraint.mix += (mix - ikConstraint.mix) * alpha;
+			ikConstraint.bendDirection = (int)frames[frameIndex + PREV_FRAME_BEND_DIRECTION];
+		}
+	}
+
+	public class FlipXTimeline : Timeline {
+		internal int boneIndex;
+		internal float[] frames;
+
+		public int BoneIndex { get { return boneIndex; } set { boneIndex = value; } }
+		public float[] Frames { get { return frames; } set { frames = value; } } // time, flip, ...
+		public int FrameCount { get { return frames.Length >> 1; } }
+
+		public FlipXTimeline (int frameCount) {
+			frames = new float[frameCount << 1];
+		}
+
+		/// <summary>Sets the time and value of the specified keyframe.</summary>
+		public void SetFrame (int frameIndex, float time, bool flip) {
+			frameIndex *= 2;
+			frames[frameIndex] = time;
+			frames[frameIndex + 1] = flip ? 1 : 0;
+		}
+
+		public void Apply (Skeleton skeleton, float lastTime, float time, List<Event> firedEvents, float alpha) {
+			float[] frames = this.frames;
+			if (time < frames[0]) {
+				if (lastTime > time) Apply(skeleton, lastTime, int.MaxValue, null, 0);
+				return;
+			} else if (lastTime > time) //
+				lastTime = -1;
+
+			int frameIndex = (time >= frames[frames.Length - 2] ? frames.Length : Animation.binarySearch(frames, time, 2)) - 2;
+			if (frames[frameIndex] < lastTime) return;
+
+			SetFlip(skeleton.bones[boneIndex], frames[frameIndex + 1] != 0);
+		}
+
+		virtual protected void SetFlip (Bone bone, bool flip) {
+			bone.flipX = flip;
+		}
+	}
+
+	public class FlipYTimeline : FlipXTimeline {
+		public FlipYTimeline (int frameCount)
+			: base(frameCount) {
+		}
+
+		override protected void SetFlip (Bone bone, bool flip) {
+			bone.flipY = flip;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/AnimationState.cs

@@ -0,0 +1,299 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace SpineRuntime21 {
+	public class AnimationState {
+		private AnimationStateData data;
+		private List<TrackEntry> tracks = new List<TrackEntry>();
+		private List<Event> events = new List<Event>();
+		private float timeScale = 1;
+
+		public AnimationStateData Data { get { return data; } }
+		public float TimeScale { get { return timeScale; } set { timeScale = value; } }
+
+		public delegate void StartEndDelegate(AnimationState state, int trackIndex);
+		public event StartEndDelegate Start;
+		public event StartEndDelegate End;
+
+		public delegate void EventDelegate(AnimationState state, int trackIndex, Event e);
+		public event EventDelegate Event;
+		
+		public delegate void CompleteDelegate(AnimationState state, int trackIndex, int loopCount);
+		public event CompleteDelegate Complete;
+
+		public AnimationState (AnimationStateData data) {
+			if (data == null) throw new ArgumentNullException("data cannot be null.");
+			this.data = data;
+		}
+
+		public void Update (float delta) {
+			delta *= timeScale;
+			for (int i = 0; i < tracks.Count; i++) {
+				TrackEntry current = tracks[i];
+				if (current == null) continue;
+
+				float trackDelta = delta * current.timeScale;
+				float time = current.time + trackDelta;
+				float endTime = current.endTime;
+
+				current.time = time;
+				if (current.previous != null) {
+					current.previous.time += trackDelta;
+					current.mixTime += trackDelta;
+				}
+
+				// Check if completed the animation or a loop iteration.
+				if (current.loop ? (current.lastTime % endTime > time % endTime) : (current.lastTime < endTime && time >= endTime)) {
+					int count = (int)(time / endTime);
+					current.OnComplete(this, i, count);
+					if (Complete != null) Complete(this, i, count);
+				}
+
+				TrackEntry next = current.next;
+				if (next != null) {
+					next.time = current.lastTime - next.delay;
+					if (next.time >= 0) SetCurrent(i, next);
+				} else {
+					// End non-looping animation when it reaches its end time and there is no next entry.
+					if (!current.loop && current.lastTime >= current.endTime) ClearTrack(i);
+				}
+			}
+		}
+
+		public void Apply (Skeleton skeleton) {
+			List<Event> events = this.events;
+
+			for (int i = 0; i < tracks.Count; i++) {
+				TrackEntry current = tracks[i];
+				if (current == null) continue;
+
+				events.Clear();
+
+				float time = current.time;
+				bool loop = current.loop;
+				if (!loop && time > current.endTime) time = current.endTime;
+
+				TrackEntry previous = current.previous;
+				if (previous == null) {
+					if (current.mix == 1)
+						current.animation.Apply(skeleton, current.lastTime, time, loop, events);
+					else
+						current.animation.Mix(skeleton, current.lastTime, time, loop, events, current.mix);
+				} else {
+					float previousTime = previous.time;
+					if (!previous.loop && previousTime > previous.endTime) previousTime = previous.endTime;
+					previous.animation.Apply(skeleton, previousTime, previousTime, previous.loop, null);
+
+					float alpha = current.mixTime / current.mixDuration * current.mix;
+					if (alpha >= 1) {
+						alpha = 1;
+						current.previous = null;
+					}
+					current.animation.Mix(skeleton, current.lastTime, time, loop, events, alpha);
+				}
+
+				for (int ii = 0, nn = events.Count; ii < nn; ii++) {
+					Event e = events[ii];
+					current.OnEvent(this, i, e);
+					if (Event != null) Event(this, i, e);
+				}
+
+				current.lastTime = current.time;
+			}
+		}
+
+		public void ClearTracks () {
+			for (int i = 0, n = tracks.Count; i < n; i++)
+				ClearTrack(i);
+			tracks.Clear();
+		}
+
+		public void ClearTrack (int trackIndex) {
+			if (trackIndex >= tracks.Count) return;
+			TrackEntry current = tracks[trackIndex];
+			if (current == null) return;
+
+			current.OnEnd(this, trackIndex);
+			if (End != null) End(this, trackIndex);
+
+			tracks[trackIndex] = null;
+		}
+
+		private TrackEntry ExpandToIndex (int index) {
+			if (index < tracks.Count) return tracks[index];
+			while (index >= tracks.Count)
+				tracks.Add(null);
+			return null;
+		}
+
+		private void SetCurrent (int index, TrackEntry entry) {
+			TrackEntry current = ExpandToIndex(index);
+			if (current != null) {
+				TrackEntry previous = current.previous;
+				current.previous = null;
+
+				current.OnEnd(this, index);
+				if (End != null) End(this, index);
+
+				entry.mixDuration = data.GetMix(current.animation, entry.animation);
+				if (entry.mixDuration > 0) {
+					entry.mixTime = 0;
+					// If a mix is in progress, mix from the closest animation.
+					if (previous != null && current.mixTime / current.mixDuration < 0.5f)
+						entry.previous = previous;
+					else
+						entry.previous = current;
+				}
+			}
+
+			tracks[index] = entry;
+
+			entry.OnStart(this, index);
+			if (Start != null) Start(this, index);
+		}
+
+		public TrackEntry SetAnimation (int trackIndex, String animationName, bool loop) {
+			Animation animation = data.skeletonData.FindAnimation(animationName);
+			if (animation == null) throw new ArgumentException("Animation not found: " + animationName);
+			return SetAnimation(trackIndex, animation, loop);
+		}
+
+		/// <summary>Set the current animation. Any queued animations are cleared.</summary>
+		public TrackEntry SetAnimation (int trackIndex, Animation animation, bool loop) {
+			if (animation == null) throw new ArgumentException("animation cannot be null.");
+			TrackEntry entry = new TrackEntry();
+			entry.animation = animation;
+			entry.loop = loop;
+			entry.time = 0;
+			entry.endTime = animation.Duration;
+			SetCurrent(trackIndex, entry);
+			return entry;
+		}
+
+		public TrackEntry AddAnimation (int trackIndex, String animationName, bool loop, float delay) {
+			Animation animation = data.skeletonData.FindAnimation(animationName);
+			if (animation == null) throw new ArgumentException("Animation not found: " + animationName);
+			return AddAnimation(trackIndex, animation, loop, delay);
+		}
+
+		/// <summary>Adds an animation to be played delay seconds after the current or last queued animation.</summary>
+		/// <param name="delay">May be <= 0 to use duration of previous animation minus any mix duration plus the negative delay.</param>
+		public TrackEntry AddAnimation (int trackIndex, Animation animation, bool loop, float delay) {
+			if (animation == null) throw new ArgumentException("animation cannot be null.");
+			TrackEntry entry = new TrackEntry();
+			entry.animation = animation;
+			entry.loop = loop;
+			entry.time = 0;
+			entry.endTime = animation.Duration;
+
+			TrackEntry last = ExpandToIndex(trackIndex);
+			if (last != null) {
+				while (last.next != null)
+					last = last.next;
+				last.next = entry;
+			} else
+				tracks[trackIndex] = entry;
+
+			if (delay <= 0) {
+				if (last != null)
+					delay += last.endTime - data.GetMix(last.animation, animation);
+				else
+					delay = 0;
+			}
+			entry.delay = delay;
+
+			return entry;
+		}
+
+		/// <returns>May be null.</returns>
+		public TrackEntry GetCurrent (int trackIndex) {
+			if (trackIndex >= tracks.Count) return null;
+			return tracks[trackIndex];
+		}
+
+		override public String ToString () {
+			StringBuilder buffer = new StringBuilder();
+			for (int i = 0, n = tracks.Count; i < n; i++) {
+				TrackEntry entry = tracks[i];
+				if (entry == null) continue;
+				if (buffer.Length > 0) buffer.Append(", ");
+				buffer.Append(entry.ToString());
+			}
+			if (buffer.Length == 0) return "<none>";
+			return buffer.ToString();
+		}
+	}
+
+	public class TrackEntry {
+		internal TrackEntry next, previous;
+		internal Animation animation;
+		internal bool loop;
+		internal float delay, time, lastTime = -1, endTime, timeScale = 1;
+		internal float mixTime, mixDuration, mix = 1;
+
+		public Animation Animation { get { return animation; } }
+		public float Delay { get { return delay; } set { delay = value; } }
+		public float Time { get { return time; } set { time = value; } }
+		public float LastTime { get { return lastTime; } set { lastTime = value; } }
+		public float EndTime { get { return endTime; } set { endTime = value; } }
+		public float TimeScale { get { return timeScale; } set { timeScale = value; } }
+		public float Mix { get { return mix; } set { mix = value; } }
+		public bool Loop { get { return loop; } set { loop = value; } }
+
+		public event AnimationState.StartEndDelegate Start;
+		public event AnimationState.StartEndDelegate End;
+		public event AnimationState.EventDelegate Event;
+		public event AnimationState.CompleteDelegate Complete;
+
+		internal void OnStart (AnimationState state, int index) {
+			if (Start != null) Start(state, index);
+		}
+
+		internal void OnEnd (AnimationState state, int index) {
+			if (End != null) End(state, index);
+		}
+
+		internal void OnEvent (AnimationState state, int index, Event e) {
+			if (Event != null) Event(state, index, e);
+		}
+
+		internal void OnComplete (AnimationState state, int index, int loopCount) {
+			if (Complete != null) Complete(state, index, loopCount);
+		}
+
+		override public String ToString () {
+			return animation == null ? "<none>" : animation.name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/AnimationStateData.cs

@@ -0,0 +1,70 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	public class AnimationStateData {
+		internal SkeletonData skeletonData;
+		private Dictionary<KeyValuePair<Animation, Animation>, float> animationToMixTime = new Dictionary<KeyValuePair<Animation, Animation>, float>();
+		internal float defaultMix;
+
+		public SkeletonData SkeletonData { get { return skeletonData; } }
+		public float DefaultMix { get { return defaultMix; } set { defaultMix = value; } }
+
+		public AnimationStateData (SkeletonData skeletonData) {
+			this.skeletonData = skeletonData;
+		}
+
+		public void SetMix (String fromName, String toName, float duration) {
+			Animation from = skeletonData.FindAnimation(fromName);
+			if (from == null) throw new ArgumentException("Animation not found: " + fromName);
+			Animation to = skeletonData.FindAnimation(toName);
+			if (to == null) throw new ArgumentException("Animation not found: " + toName);
+			SetMix(from, to, duration);
+		}
+
+		public void SetMix (Animation from, Animation to, float duration) {
+			if (from == null) throw new ArgumentNullException("from cannot be null.");
+			if (to == null) throw new ArgumentNullException("to cannot be null.");
+			KeyValuePair<Animation, Animation> key = new KeyValuePair<Animation, Animation>(from, to);
+			animationToMixTime.Remove(key);
+			animationToMixTime.Add(key, duration);
+		}
+
+		public float GetMix (Animation from, Animation to) {
+			KeyValuePair<Animation, Animation> key = new KeyValuePair<Animation, Animation>(from, to);
+			float duration;
+			if (animationToMixTime.TryGetValue(key, out duration)) return duration;
+			return defaultMix;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Atlas.cs

@@ -0,0 +1,288 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+
+#if WINDOWS_STOREAPP
+using System.Threading.Tasks;
+using Windows.Storage;
+#endif
+
+namespace SpineRuntime21 {
+	public class Atlas {
+		List<AtlasPage> pages = new List<AtlasPage>();
+		List<AtlasRegion> regions = new List<AtlasRegion>();
+		TextureLoader textureLoader;
+
+#if WINDOWS_STOREAPP
+		private async Task ReadFile(string path, TextureLoader textureLoader) {
+			var folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
+			var file = await folder.GetFileAsync(path).AsTask().ConfigureAwait(false);
+			using (var reader = new StreamReader(await file.OpenStreamForReadAsync().ConfigureAwait(false))) {
+				try {
+					Load(reader, Path.GetDirectoryName(path), textureLoader);
+				} catch (Exception ex) {
+					throw new Exception("Error reading atlas file: " + path, ex);
+				}
+			}
+		}
+
+		public Atlas(String path, TextureLoader textureLoader) {
+			this.ReadFile(path, textureLoader).Wait();
+		}
+#else
+		public Atlas (String path, TextureLoader textureLoader) {
+
+#if WINDOWS_PHONE
+            Stream stream = Microsoft.Xna.Framework.TitleContainer.OpenStream(path);
+            using (StreamReader reader = new StreamReader(stream))
+            {
+#else
+            using (StreamReader reader = new StreamReader(path)) {
+#endif
+				try {
+					Load(reader, Path.GetDirectoryName(path), textureLoader);
+				} catch (Exception ex) {
+					throw new Exception("Error reading atlas file: " + path, ex);
+				}
+			}
+		}
+#endif
+
+		public Atlas (TextReader reader, String dir, TextureLoader textureLoader) {
+			Load(reader, dir, textureLoader);
+		}
+
+		public Atlas (List<AtlasPage> pages, List<AtlasRegion> regions) {
+			this.pages = pages;
+			this.regions = regions;
+			this.textureLoader = null;
+		}
+
+		private void Load (TextReader reader, String imagesDir, TextureLoader textureLoader) {
+			if (textureLoader == null) throw new ArgumentNullException("textureLoader cannot be null.");
+			this.textureLoader = textureLoader;
+
+			String[] tuple = new String[4];
+			AtlasPage page = null;
+			while (true) {
+				String line = reader.ReadLine();
+				if (line == null) break;
+				if (line.Trim().Length == 0)
+					page = null;
+				else if (page == null) {
+					page = new AtlasPage();
+					page.name = line;
+
+					if (readTuple(reader, tuple) == 2) { // size is only optional for an atlas packed with an old TexturePacker.
+						page.width = int.Parse(tuple[0]);
+						page.height = int.Parse(tuple[1]);
+						readTuple(reader, tuple);
+					}
+					page.format = (Format)Enum.Parse(typeof(Format), tuple[0], false);
+
+					readTuple(reader, tuple);
+					page.minFilter = (TextureFilter)Enum.Parse(typeof(TextureFilter), tuple[0], false);
+					page.magFilter = (TextureFilter)Enum.Parse(typeof(TextureFilter), tuple[1], false);
+
+					String direction = readValue(reader);
+					page.uWrap = TextureWrap.ClampToEdge;
+					page.vWrap = TextureWrap.ClampToEdge;
+					if (direction == "x")
+						page.uWrap = TextureWrap.Repeat;
+					else if (direction == "y")
+						page.vWrap = TextureWrap.Repeat;
+					else if (direction == "xy")
+						page.uWrap = page.vWrap = TextureWrap.Repeat;
+
+					textureLoader.Load(page, Path.Combine(imagesDir, line));
+
+					pages.Add(page);
+
+				} else {
+					AtlasRegion region = new AtlasRegion();
+					region.name = line;
+					region.page = page;
+
+					region.rotate = Boolean.Parse(readValue(reader));
+
+					readTuple(reader, tuple);
+					int x = int.Parse(tuple[0]);
+					int y = int.Parse(tuple[1]);
+
+					readTuple(reader, tuple);
+					int width = int.Parse(tuple[0]);
+					int height = int.Parse(tuple[1]);
+
+					region.u = x / (float)page.width;
+					region.v = y / (float)page.height;
+					if (region.rotate) {
+						region.u2 = (x + height) / (float)page.width;
+						region.v2 = (y + width) / (float)page.height;
+					} else {
+						region.u2 = (x + width) / (float)page.width;
+						region.v2 = (y + height) / (float)page.height;
+					}
+					region.x = x;
+					region.y = y;
+					region.width = Math.Abs(width);
+					region.height = Math.Abs(height);
+
+					if (readTuple(reader, tuple) == 4) { // split is optional
+						region.splits = new int[] {int.Parse(tuple[0]), int.Parse(tuple[1]),
+								int.Parse(tuple[2]), int.Parse(tuple[3])};
+
+						if (readTuple(reader, tuple) == 4) { // pad is optional, but only present with splits
+							region.pads = new int[] {int.Parse(tuple[0]), int.Parse(tuple[1]),
+									int.Parse(tuple[2]), int.Parse(tuple[3])};
+
+							readTuple(reader, tuple);
+						}
+					}
+
+					region.originalWidth = int.Parse(tuple[0]);
+					region.originalHeight = int.Parse(tuple[1]);
+
+					readTuple(reader, tuple);
+					region.offsetX = int.Parse(tuple[0]);
+					region.offsetY = int.Parse(tuple[1]);
+
+					region.index = int.Parse(readValue(reader));
+
+					regions.Add(region);
+				}
+			}
+		}
+
+		static String readValue (TextReader reader) {
+			String line = reader.ReadLine();
+			int colon = line.IndexOf(':');
+			if (colon == -1) throw new Exception("Invalid line: " + line);
+			return line.Substring(colon + 1).Trim();
+		}
+
+		/// <summary>Returns the number of tuple values read (1, 2 or 4).</summary>
+		static int readTuple (TextReader reader, String[] tuple) {
+			String line = reader.ReadLine();
+			int colon = line.IndexOf(':');
+			if (colon == -1) throw new Exception("Invalid line: " + line);
+			int i = 0, lastMatch = colon + 1;
+			for (; i < 3; i++) {
+				int comma = line.IndexOf(',', lastMatch);
+				if (comma == -1) break;
+				tuple[i] = line.Substring(lastMatch, comma - lastMatch).Trim();
+				lastMatch = comma + 1;
+			}
+			tuple[i] = line.Substring(lastMatch).Trim();
+			return i + 1;
+		}
+
+		public void FlipV () {
+			for (int i = 0, n = regions.Count; i < n; i++) {
+				AtlasRegion region = regions[i];
+				region.v = 1 - region.v;
+				region.v2 = 1 - region.v2;
+			}
+		}
+
+		/// <summary>Returns the first region found with the specified name. This method uses string comparison to find the region, so the result
+		/// should be cached rather than calling this method multiple times.</summary>
+		/// <returns>The region, or null.</returns>
+		public AtlasRegion FindRegion (String name) {
+			for (int i = 0, n = regions.Count; i < n; i++)
+				if (regions[i].name == name) return regions[i];
+			return null;
+		}
+
+		public void Dispose () {
+			if (textureLoader == null) return;
+			for (int i = 0, n = pages.Count; i < n; i++)
+				textureLoader.Unload(pages[i].rendererObject);
+		}
+	}
+
+	public enum Format {
+		Alpha,
+		Intensity,
+		LuminanceAlpha,
+		RGB565,
+		RGBA4444,
+		RGB888,
+		RGBA8888
+	}
+
+	public enum TextureFilter {
+		Nearest,
+		Linear,
+		MipMap,
+		MipMapNearestNearest,
+		MipMapLinearNearest,
+		MipMapNearestLinear,
+		MipMapLinearLinear
+	}
+
+	public enum TextureWrap {
+		MirroredRepeat,
+		ClampToEdge,
+		Repeat
+	}
+
+	public class AtlasPage {
+		public String name;
+		public Format format;
+		public TextureFilter minFilter;
+		public TextureFilter magFilter;
+		public TextureWrap uWrap;
+		public TextureWrap vWrap;
+		public Object rendererObject;
+		public int width, height;
+	}
+
+	public class AtlasRegion {
+		public AtlasPage page;
+		public String name;
+		public int x, y, width, height;
+		public float u, v, u2, v2;
+		public float offsetX, offsetY;
+		public int originalWidth, originalHeight;
+		public int index;
+		public bool rotate;
+		public int[] splits;
+		public int[] pads;
+	}
+
+	public interface TextureLoader {
+		void Load (AtlasPage page, String path);
+		void Unload (Object texture);
+	}
+}

SpineRuntimes/SpineRuntime21/Attachments/AtlasAttachmentLoader.cs

@@ -0,0 +1,111 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	public class AtlasAttachmentLoader : AttachmentLoader {
+		private Atlas[] atlasArray;
+
+		public AtlasAttachmentLoader (params Atlas[] atlasArray) {
+			if (atlasArray == null) throw new ArgumentNullException("atlas array cannot be null.");
+			this.atlasArray = atlasArray;
+		}
+
+		public RegionAttachment NewRegionAttachment (Skin skin, String name, String path) {
+			AtlasRegion region = FindRegion(path);
+			if (region == null) throw new Exception("Region not found in atlas: " + path + " (region attachment: " + name + ")");
+			RegionAttachment attachment = new RegionAttachment(name);
+			attachment.RendererObject = region;
+			attachment.SetUVs(region.u, region.v, region.u2, region.v2, region.rotate);
+			attachment.regionOffsetX = region.offsetX;
+			attachment.regionOffsetY = region.offsetY;
+			attachment.regionWidth = region.width;
+			attachment.regionHeight = region.height;
+			attachment.regionOriginalWidth = region.originalWidth;
+			attachment.regionOriginalHeight = region.originalHeight;
+			return attachment;
+		}
+
+		public MeshAttachment NewMeshAttachment (Skin skin, String name, String path) {
+			AtlasRegion region = FindRegion(path);
+			if (region == null) throw new Exception("Region not found in atlas: " + path + " (mesh attachment: " + name + ")");
+			MeshAttachment attachment = new MeshAttachment(name);
+			attachment.RendererObject = region;
+			attachment.RegionU = region.u;
+			attachment.RegionV = region.v;
+			attachment.RegionU2 = region.u2;
+			attachment.RegionV2 = region.v2;
+			attachment.RegionRotate = region.rotate;
+			attachment.regionOffsetX = region.offsetX;
+			attachment.regionOffsetY = region.offsetY;
+			attachment.regionWidth = region.width;
+			attachment.regionHeight = region.height;
+			attachment.regionOriginalWidth = region.originalWidth;
+			attachment.regionOriginalHeight = region.originalHeight;
+			return attachment;
+		}
+
+		public SkinnedMeshAttachment NewSkinnedMeshAttachment (Skin skin, String name, String path) {
+			AtlasRegion region = FindRegion(path);
+			if (region == null) throw new Exception("Region not found in atlas: " + path + " (skinned mesh attachment: " + name + ")");
+			SkinnedMeshAttachment attachment = new SkinnedMeshAttachment(name);
+			attachment.RendererObject = region;
+			attachment.RegionU = region.u;
+			attachment.RegionV = region.v;
+			attachment.RegionU2 = region.u2;
+			attachment.RegionV2 = region.v2;
+			attachment.RegionRotate = region.rotate;
+			attachment.regionOffsetX = region.offsetX;
+			attachment.regionOffsetY = region.offsetY;
+			attachment.regionWidth = region.width;
+			attachment.regionHeight = region.height;
+			attachment.regionOriginalWidth = region.originalWidth;
+			attachment.regionOriginalHeight = region.originalHeight;
+			return attachment;
+		}
+
+		public BoundingBoxAttachment NewBoundingBoxAttachment (Skin skin, String name) {
+			return new BoundingBoxAttachment(name);
+		}
+
+		public AtlasRegion FindRegion(string name) {
+			AtlasRegion region;
+
+			for (int i = 0; i < atlasArray.Length; i++) {
+				region = atlasArray[i].FindRegion(name);
+				if (region != null)
+					return region;
+			}
+
+			return null;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Attachments/Attachment.cs

@@ -0,0 +1,46 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	abstract public class Attachment {
+		public String Name { get; private set; }
+
+		public Attachment (String name) {
+			if (name == null) throw new ArgumentNullException("name cannot be null.");
+			Name = name;
+		}
+
+		override public String ToString () {
+			return Name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Attachments/AttachmentLoader.cs

@@ -0,0 +1,47 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	public interface AttachmentLoader {
+		/// <return>May be null to not load any attachment.</return>
+		RegionAttachment NewRegionAttachment (Skin skin, String name, String path);
+
+		/// <return>May be null to not load any attachment.</return>
+		MeshAttachment NewMeshAttachment (Skin skin, String name, String path);
+
+		/// <return>May be null to not load any attachment.</return>
+		SkinnedMeshAttachment NewSkinnedMeshAttachment (Skin skin, String name, String path);
+
+		/// <return>May be null to not load any attachment.</return>
+		BoundingBoxAttachment NewBoundingBoxAttachment (Skin skin, String name);
+	}
+}

SpineRuntimes/SpineRuntime21/Attachments/AttachmentType.cs

@@ -0,0 +1,35 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+namespace SpineRuntime21 {
+	public enum AttachmentType {
+		region, boundingbox, mesh, skinnedmesh
+	}
+}

SpineRuntimes/SpineRuntime21/Attachments/BoundingBoxAttachment.cs

@@ -0,0 +1,60 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	/// <summary>Attachment that has a polygon for bounds checking.</summary>
+	public class BoundingBoxAttachment : Attachment {
+		internal float[] vertices;
+
+		public float[] Vertices { get { return vertices; } set { vertices = value; } }
+
+		public BoundingBoxAttachment (string name)
+			: base(name) {
+		}
+
+		/// <param name="worldVertices">Must have at least the same length as this attachment's vertices.</param>
+		public void ComputeWorldVertices (Bone bone, float[] worldVertices) {
+			float x = bone.skeleton.x + bone.worldX, y = bone.skeleton.y + bone.worldY;
+			float m00 = bone.m00;
+			float m01 = bone.m01;
+			float m10 = bone.m10;
+			float m11 = bone.m11;
+			float[] vertices = this.vertices;
+			for (int i = 0, n = vertices.Length; i < n; i += 2) {
+				float px = vertices[i];
+				float py = vertices[i + 1];
+				worldVertices[i] = px * m00 + py * m01 + x;
+				worldVertices[i + 1] = px * m10 + py * m11 + y;
+			}
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Attachments/MeshAttachment.cs

@@ -0,0 +1,108 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	/// <summary>Attachment that displays a texture region.</summary>
+	public class MeshAttachment : Attachment {
+		internal float[] vertices, uvs, regionUVs;
+		internal int[] triangles;
+		internal float regionOffsetX, regionOffsetY, regionWidth, regionHeight, regionOriginalWidth, regionOriginalHeight;
+		internal float r = 1, g = 1, b = 1, a = 1;
+
+		public int HullLength { get; set; }
+		public float[] Vertices { get { return vertices; } set { vertices = value; } }
+		public float[] RegionUVs { get { return regionUVs; } set { regionUVs = value; } }
+		public float[] UVs { get { return uvs; } set { uvs = value; } }
+		public int[] Triangles { get { return triangles; } set { triangles = value; } }
+
+		public float R { get { return r; } set { r = value; } }
+		public float G { get { return g; } set { g = value; } }
+		public float B { get { return b; } set { b = value; } }
+		public float A { get { return a; } set { a = value; } }
+
+		public String Path { get; set; }
+		public Object RendererObject { get; set; }
+		public float RegionU { get; set; }
+		public float RegionV { get; set; }
+		public float RegionU2 { get; set; }
+		public float RegionV2 { get; set; }
+		public bool RegionRotate { get; set; }
+		public float RegionOffsetX { get { return regionOffsetX; } set { regionOffsetX = value; } }
+		public float RegionOffsetY { get { return regionOffsetY; } set { regionOffsetY = value; } } // Pixels stripped from the bottom left, unrotated.
+		public float RegionWidth { get { return regionWidth; } set { regionWidth = value; } }
+		public float RegionHeight { get { return regionHeight; } set { regionHeight = value; } } // Unrotated, stripped size.
+		public float RegionOriginalWidth { get { return regionOriginalWidth; } set { regionOriginalWidth = value; } }
+		public float RegionOriginalHeight { get { return regionOriginalHeight; } set { regionOriginalHeight = value; } } // Unrotated, unstripped size.
+
+		// Nonessential.
+		public int[] Edges { get; set; }
+		public float Width { get; set; }
+		public float Height { get; set; }
+
+		public MeshAttachment (string name)
+			: base(name) {
+		}
+
+		public void UpdateUVs () {
+			float u = RegionU, v = RegionV, width = RegionU2 - RegionU, height = RegionV2 - RegionV;
+			float[] regionUVs = this.regionUVs;
+			if (this.uvs == null || this.uvs.Length != regionUVs.Length) this.uvs = new float[regionUVs.Length];
+			float[] uvs = this.uvs;
+			if (RegionRotate) {
+				for (int i = 0, n = uvs.Length; i < n; i += 2) {
+					uvs[i] = u + regionUVs[i + 1] * width;
+					uvs[i + 1] = v + height - regionUVs[i] * height;
+				}
+			} else {
+				for (int i = 0, n = uvs.Length; i < n; i += 2) {
+					uvs[i] = u + regionUVs[i] * width;
+					uvs[i + 1] = v + regionUVs[i + 1] * height;
+				}
+			}
+		}
+
+		public void ComputeWorldVertices (Slot slot, float[] worldVertices) {
+			Bone bone = slot.bone;
+			float x = bone.skeleton.x + bone.worldX, y = bone.skeleton.y + bone.worldY;
+			float m00 = bone.m00, m01 = bone.m01, m10 = bone.m10, m11 = bone.m11;
+			float[] vertices = this.vertices;
+			int verticesCount = vertices.Length;
+			if (slot.attachmentVerticesCount == verticesCount) vertices = slot.AttachmentVertices;
+			for (int i = 0; i < verticesCount; i += 2) {
+				float vx = vertices[i];
+				float vy = vertices[i + 1];
+				worldVertices[i] = vx * m00 + vy * m01 + x;
+				worldVertices[i + 1] = vx * m10 + vy * m11 + y;
+			}
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Attachments/RegionAttachment.cs

@@ -0,0 +1,151 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	/// <summary>Attachment that displays a texture region.</summary>
+	public class RegionAttachment : Attachment {
+		public const int X1 = 0;
+		public const int Y1 = 1;
+		public const int X2 = 2;
+		public const int Y2 = 3;
+		public const int X3 = 4;
+		public const int Y3 = 5;
+		public const int X4 = 6;
+		public const int Y4 = 7;
+
+		internal float x, y, rotation, scaleX = 1, scaleY = 1, width, height;
+		internal float regionOffsetX, regionOffsetY, regionWidth, regionHeight, regionOriginalWidth, regionOriginalHeight;
+		internal float[] offset = new float[8], uvs = new float[8];
+		internal float r = 1, g = 1, b = 1, a = 1;
+
+		public float X { get { return x; } set { x = value; } }
+		public float Y { get { return y; } set { y = value; } }
+		public float Rotation { get { return rotation; } set { rotation = value; } }
+		public float ScaleX { get { return scaleX; } set { scaleX = value; } }
+		public float ScaleY { get { return scaleY; } set { scaleY = value; } }
+		public float Width { get { return width; } set { width = value; } }
+		public float Height { get { return height; } set { height = value; } }
+
+		public float R { get { return r; } set { r = value; } }
+		public float G { get { return g; } set { g = value; } }
+		public float B { get { return b; } set { b = value; } }
+		public float A { get { return a; } set { a = value; } }
+
+		public String Path { get; set; }
+		public Object RendererObject { get; set; }
+		public float RegionOffsetX { get { return regionOffsetX; } set { regionOffsetX = value; } }
+		public float RegionOffsetY { get { return regionOffsetY; } set { regionOffsetY = value; } } // Pixels stripped from the bottom left, unrotated.
+		public float RegionWidth { get { return regionWidth; } set { regionWidth = value; } }
+		public float RegionHeight { get { return regionHeight; } set { regionHeight = value; } } // Unrotated, stripped size.
+		public float RegionOriginalWidth { get { return regionOriginalWidth; } set { regionOriginalWidth = value; } }
+		public float RegionOriginalHeight { get { return regionOriginalHeight; } set { regionOriginalHeight = value; } } // Unrotated, unstripped size.
+
+		public float[] Offset { get { return offset; } }
+		public float[] UVs { get { return uvs; } }
+
+		public RegionAttachment (string name)
+			: base(name) {
+		}
+
+		public void SetUVs (float u, float v, float u2, float v2, bool rotate) {
+			float[] uvs = this.uvs;
+			if (rotate) {
+				uvs[X2] = u;
+				uvs[Y2] = v2;
+				uvs[X3] = u;
+				uvs[Y3] = v;
+				uvs[X4] = u2;
+				uvs[Y4] = v;
+				uvs[X1] = u2;
+				uvs[Y1] = v2;
+			} else {
+				uvs[X1] = u;
+				uvs[Y1] = v2;
+				uvs[X2] = u;
+				uvs[Y2] = v;
+				uvs[X3] = u2;
+				uvs[Y3] = v;
+				uvs[X4] = u2;
+				uvs[Y4] = v2;
+			}
+		}
+
+		public void UpdateOffset () {
+			float width = this.width;
+			float height = this.height;
+			float scaleX = this.scaleX;
+			float scaleY = this.scaleY;
+			float regionScaleX = width / regionOriginalWidth * scaleX;
+			float regionScaleY = height / regionOriginalHeight * scaleY;
+			float localX = -width / 2 * scaleX + regionOffsetX * regionScaleX;
+			float localY = -height / 2 * scaleY + regionOffsetY * regionScaleY;
+			float localX2 = localX + regionWidth * regionScaleX;
+			float localY2 = localY + regionHeight * regionScaleY;
+			float radians = rotation * (float)Math.PI / 180;
+			float cos = (float)Math.Cos(radians);
+			float sin = (float)Math.Sin(radians);
+			float x = this.x;
+			float y = this.y;
+			float localXCos = localX * cos + x;
+			float localXSin = localX * sin;
+			float localYCos = localY * cos + y;
+			float localYSin = localY * sin;
+			float localX2Cos = localX2 * cos + x;
+			float localX2Sin = localX2 * sin;
+			float localY2Cos = localY2 * cos + y;
+			float localY2Sin = localY2 * sin;
+			float[] offset = this.offset;
+			offset[X1] = localXCos - localYSin;
+			offset[Y1] = localYCos + localXSin;
+			offset[X2] = localXCos - localY2Sin;
+			offset[Y2] = localY2Cos + localXSin;
+			offset[X3] = localX2Cos - localY2Sin;
+			offset[Y3] = localY2Cos + localX2Sin;
+			offset[X4] = localX2Cos - localYSin;
+			offset[Y4] = localYCos + localX2Sin;
+		}
+
+		public void ComputeWorldVertices (Bone bone, float[] worldVertices) {
+			float x = bone.skeleton.x + bone.worldX, y = bone.skeleton.y + bone.worldY;
+			float m00 = bone.m00, m01 = bone.m01, m10 = bone.m10, m11 = bone.m11;
+			float[] offset = this.offset;
+			worldVertices[X1] = offset[X1] * m00 + offset[Y1] * m01 + x;
+			worldVertices[Y1] = offset[X1] * m10 + offset[Y1] * m11 + y;
+			worldVertices[X2] = offset[X2] * m00 + offset[Y2] * m01 + x;
+			worldVertices[Y2] = offset[X2] * m10 + offset[Y2] * m11 + y;
+			worldVertices[X3] = offset[X3] * m00 + offset[Y3] * m01 + x;
+			worldVertices[Y3] = offset[X3] * m10 + offset[Y3] * m11 + y;
+			worldVertices[X4] = offset[X4] * m00 + offset[Y4] * m01 + x;
+			worldVertices[Y4] = offset[X4] * m10 + offset[Y4] * m11 + y;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Attachments/SkinnedMeshAttachment.cs

@@ -0,0 +1,132 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	/// <summary>Attachment that displays a texture region.</summary>
+	public class SkinnedMeshAttachment : Attachment {
+		internal int[] bones;
+		internal float[] weights, uvs, regionUVs;
+		internal int[] triangles;
+		internal float regionOffsetX, regionOffsetY, regionWidth, regionHeight, regionOriginalWidth, regionOriginalHeight;
+		internal float r = 1, g = 1, b = 1, a = 1;
+
+		public int HullLength { get; set; }
+		public int[] Bones { get { return bones; } set { bones = value; } }
+		public float[] Weights { get { return weights; } set { weights = value; } }
+		public float[] RegionUVs { get { return regionUVs; } set { regionUVs = value; } }
+		public float[] UVs { get { return uvs; } set { uvs = value; } }
+		public int[] Triangles { get { return triangles; } set { triangles = value; } }
+
+		public float R { get { return r; } set { r = value; } }
+		public float G { get { return g; } set { g = value; } }
+		public float B { get { return b; } set { b = value; } }
+		public float A { get { return a; } set { a = value; } }
+
+		public String Path { get; set; }
+		public Object RendererObject { get; set; }
+		public float RegionU { get; set; }
+		public float RegionV { get; set; }
+		public float RegionU2 { get; set; }
+		public float RegionV2 { get; set; }
+		public bool RegionRotate { get; set; }
+		public float RegionOffsetX { get { return regionOffsetX; } set { regionOffsetX = value; } }
+		public float RegionOffsetY { get { return regionOffsetY; } set { regionOffsetY = value; } } // Pixels stripped from the bottom left, unrotated.
+		public float RegionWidth { get { return regionWidth; } set { regionWidth = value; } }
+		public float RegionHeight { get { return regionHeight; } set { regionHeight = value; } } // Unrotated, stripped size.
+		public float RegionOriginalWidth { get { return regionOriginalWidth; } set { regionOriginalWidth = value; } }
+		public float RegionOriginalHeight { get { return regionOriginalHeight; } set { regionOriginalHeight = value; } } // Unrotated, unstripped size.
+
+		// Nonessential.
+		public int[] Edges { get; set; }
+		public float Width { get; set; }
+		public float Height { get; set; }
+
+		public SkinnedMeshAttachment (string name)
+			: base(name) {
+		}
+
+		public void UpdateUVs () {
+			float u = RegionU, v = RegionV, width = RegionU2 - RegionU, height = RegionV2 - RegionV;
+			float[] regionUVs = this.regionUVs;
+			if (this.uvs == null || this.uvs.Length != regionUVs.Length) this.uvs = new float[regionUVs.Length];
+			float[] uvs = this.uvs;
+			if (RegionRotate) {
+				for (int i = 0, n = uvs.Length; i < n; i += 2) {
+					uvs[i] = u + regionUVs[i + 1] * width;
+					uvs[i + 1] = v + height - regionUVs[i] * height;
+				}
+			} else {
+				for (int i = 0, n = uvs.Length; i < n; i += 2) {
+					uvs[i] = u + regionUVs[i] * width;
+					uvs[i + 1] = v + regionUVs[i + 1] * height;
+				}
+			}
+		}
+
+		public void ComputeWorldVertices (Slot slot, float[] worldVertices) {
+			Skeleton skeleton = slot.bone.skeleton;
+			List<Bone> skeletonBones = skeleton.bones;
+			float x = skeleton.x, y = skeleton.y;
+			float[] weights = this.weights;
+			int[] bones = this.bones;
+			if (slot.attachmentVerticesCount == 0) {
+				for (int w = 0, v = 0, b = 0, n = bones.Length; v < n; w += 2) {
+					float wx = 0, wy = 0;
+					int nn = bones[v++] + v;
+					for (; v < nn; v++, b += 3) {
+						Bone bone = skeletonBones[bones[v]];
+						float vx = weights[b], vy = weights[b + 1], weight = weights[b + 2];
+						wx += (vx * bone.m00 + vy * bone.m01 + bone.worldX) * weight;
+						wy += (vx * bone.m10 + vy * bone.m11 + bone.worldY) * weight;
+					}
+					worldVertices[w] = wx + x;
+					worldVertices[w + 1] = wy + y;
+				}
+			} else {
+				float[] ffd = slot.AttachmentVertices;
+				for (int w = 0, v = 0, b = 0, f = 0, n = bones.Length; v < n; w += 2) {
+					float wx = 0, wy = 0;
+					int nn = bones[v++] + v;
+					for (; v < nn; v++, b += 3, f += 2) {
+						Bone bone = skeletonBones[bones[v]];
+						float vx = weights[b] + ffd[f], vy = weights[b + 1] + ffd[f + 1], weight = weights[b + 2];
+						wx += (vx * bone.m00 + vy * bone.m01 + bone.worldX) * weight;
+						wy += (vx * bone.m10 + vy * bone.m11 + bone.worldY) * weight;
+					}
+					worldVertices[w] = wx + x;
+					worldVertices[w + 1] = wy + y;
+				}
+			}
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Bone.cs

@@ -0,0 +1,165 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	public class Bone{
+		static public bool yDown;
+
+		internal BoneData data;
+		internal Skeleton skeleton;
+		internal Bone parent;
+		internal List<Bone> children = new List<Bone>();
+		internal float x, y, rotation, rotationIK, scaleX, scaleY;
+		internal bool flipX, flipY;
+		internal float m00, m01, m10, m11;
+		internal float worldX, worldY, worldRotation, worldScaleX, worldScaleY;
+		internal bool worldFlipX, worldFlipY;
+
+		public BoneData Data { get { return data; } }
+		public Skeleton Skeleton { get { return skeleton; } }
+		public Bone Parent { get { return parent; } }
+		public List<Bone> Children { get { return children; } }
+		public float X { get { return x; } set { x = value; } }
+		public float Y { get { return y; } set { y = value; } }
+		/// <summary>The forward kinetics rotation.</summary>
+		public float Rotation { get { return rotation; } set { rotation = value; } }
+		/// <summary>The inverse kinetics rotation, as calculated by any IK constraints.</summary>
+		public float RotationIK { get { return rotationIK; } set { rotationIK = value; } }
+		public float ScaleX { get { return scaleX; } set { scaleX = value; } }
+		public float ScaleY { get { return scaleY; } set { scaleY = value; } }
+		public bool FlipX { get { return flipX; } set { flipX = value; } }
+		public bool FlipY { get { return flipY; } set { flipY = value; } }
+
+		public float M00 { get { return m00; } }
+		public float M01 { get { return m01; } }
+		public float M10 { get { return m10; } }
+		public float M11 { get { return m11; } }
+		public float WorldX { get { return worldX; } }
+		public float WorldY { get { return worldY; } }
+		public float WorldRotation { get { return worldRotation; } }
+		public float WorldScaleX { get { return worldScaleX; } }
+		public float WorldScaleY { get { return worldScaleY; } }
+		public bool WorldFlipX { get { return worldFlipX; } set { worldFlipX = value; } }
+		public bool WorldFlipY { get { return worldFlipY; } set { worldFlipY = value; } }
+
+		/// <param name="parent">May be null.</param>
+		public Bone (BoneData data, Skeleton skeleton, Bone parent) {
+			if (data == null) throw new ArgumentNullException("data cannot be null.");
+			if (skeleton == null) throw new ArgumentNullException("skeleton cannot be null.");
+			this.data = data;
+			this.skeleton = skeleton;
+			this.parent = parent;
+			SetToSetupPose();
+		}
+
+		/// <summary>Computes the world SRT using the parent bone and the local SRT.</summary>
+		public void UpdateWorldTransform () {
+			Bone parent = this.parent;
+			float x = this.x, y = this.y;
+			if (parent != null) {
+				worldX = x * parent.m00 + y * parent.m01 + parent.worldX;
+				worldY = x * parent.m10 + y * parent.m11 + parent.worldY;
+				if (data.inheritScale) {
+					worldScaleX = parent.worldScaleX * scaleX;
+					worldScaleY = parent.worldScaleY * scaleY;
+				} else {
+					worldScaleX = scaleX;
+					worldScaleY = scaleY;
+				}
+				worldRotation = data.inheritRotation ? parent.worldRotation + rotationIK : rotationIK;
+				worldFlipX = parent.worldFlipX != flipX;
+				worldFlipY = parent.worldFlipY != flipY;
+			} else {
+				Skeleton skeleton = this.skeleton;
+				bool skeletonFlipX = skeleton.flipX, skeletonFlipY = skeleton.flipY;
+				worldX = skeletonFlipX ? -x : x;
+				worldY = skeletonFlipY != yDown ? -y : y;
+				worldScaleX = scaleX;
+				worldScaleY = scaleY;
+				worldRotation = rotationIK;
+				worldFlipX = skeletonFlipX != flipX;
+				worldFlipY = skeletonFlipY != flipY;
+			}
+			float radians = worldRotation * (float)Math.PI / 180;
+			float cos = (float)Math.Cos(radians);
+			float sin = (float)Math.Sin(radians);
+			if (worldFlipX) {
+				m00 = -cos * worldScaleX;
+				m01 = sin * worldScaleY;
+			} else {
+				m00 = cos * worldScaleX;
+				m01 = -sin * worldScaleY;
+			}
+			if (worldFlipY != yDown) {
+				m10 = -sin * worldScaleX;
+				m11 = -cos * worldScaleY;
+			} else {
+				m10 = sin * worldScaleX;
+				m11 = cos * worldScaleY;
+			}
+		}
+
+		public void SetToSetupPose () {
+			BoneData data = this.data;
+			x = data.x;
+			y = data.y;
+			rotation = data.rotation;
+			rotationIK = rotation;
+			scaleX = data.scaleX;
+			scaleY = data.scaleY;
+			flipX = data.flipX;
+			flipY = data.flipY;
+		}
+
+		public void worldToLocal (float worldX, float worldY, out float localX, out float localY) {
+			float dx = worldX - this.worldX, dy = worldY - this.worldY;
+			float m00 = this.m00, m10 = this.m10, m01 = this.m01, m11 = this.m11;
+			if (worldFlipX != (worldFlipY != yDown)) {
+				m00 = -m00;
+				m11 = -m11;
+			}
+			float invDet = 1 / (m00 * m11 - m01 * m10);
+			localX = (dx * m00 * invDet - dy * m01 * invDet);
+			localY = (dy * m11 * invDet - dx * m10 * invDet);
+		}
+
+		public void localToWorld (float localX, float localY, out float worldX, out float worldY) {
+			worldX = localX * m00 + localY * m01 + this.worldX;
+			worldY = localX * m10 + localY * m11 + this.worldY;
+		}
+
+		override public String ToString () {
+			return data.name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/BoneData.cs

@@ -0,0 +1,66 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	public class BoneData {
+		internal BoneData parent;
+		internal String name;
+		internal float length, x, y, rotation, scaleX = 1, scaleY = 1;
+		internal bool flipX, flipY;
+		internal bool inheritScale = true, inheritRotation = true;
+
+		/// <summary>May be null.</summary>
+		public BoneData Parent { get { return parent; } }
+		public String Name { get { return name; } }
+		public float Length { get { return length; } set { length = value; } }
+		public float X { get { return x; } set { x = value; } }
+		public float Y { get { return y; } set { y = value; } }
+		public float Rotation { get { return rotation; } set { rotation = value; } }
+		public float ScaleX { get { return scaleX; } set { scaleX = value; } }
+		public float ScaleY { get { return scaleY; } set { scaleY = value; } }
+		public bool FlipX { get { return flipX; } set { flipX = value; } }
+		public bool FlipY { get { return flipY; } set { flipY = value; } }
+		public bool InheritScale { get { return inheritScale; } set { inheritScale = value; } }
+		public bool InheritRotation { get { return inheritRotation; } set { inheritRotation = value; } }
+
+		/// <param name="parent">May be null.</param>
+		public BoneData (String name, BoneData parent) {
+			if (name == null) throw new ArgumentNullException("name cannot be null.");
+			this.name = name;
+			this.parent = parent;
+		}
+
+		override public String ToString () {
+			return name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Event.cs

@@ -0,0 +1,48 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	public class Event {
+		public EventData Data { get; private set; }
+		public int Int { get; set; }
+		public float Float { get; set; }
+		public String String { get; set; }
+
+		public Event (EventData data) {
+			Data = data;
+		}
+
+		override public String ToString () {
+			return Data.Name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/EventData.cs

@@ -0,0 +1,51 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	public class EventData {
+		internal String name;
+
+		public String Name { get { return name; } }
+		public int Int { get; set; }
+		public float Float { get; set; }
+		public String String { get; set; }
+
+		public EventData (String name) {
+			if (name == null) throw new ArgumentNullException("name cannot be null.");
+			this.name = name;
+		}
+
+		override public String ToString () {
+			return Name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/IkConstraint.cs

@@ -0,0 +1,150 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	public class IkConstraint {
+		private const float radDeg = 180 / (float)Math.PI;
+
+		internal IkConstraintData data;
+		internal List<Bone> bones = new List<Bone>();
+		internal Bone target;
+		internal int bendDirection;
+		internal float mix;
+
+		public IkConstraintData Data { get { return data; } }
+		public List<Bone> Bones { get { return bones; } }
+		public Bone Target { get { return target; } set { target = value; } }
+		public int BendDirection { get { return bendDirection; } set { bendDirection = value; } }
+		public float Mix { get { return mix; } set { mix = value; } }
+
+		public IkConstraint (IkConstraintData data, Skeleton skeleton) {
+			if (data == null) throw new ArgumentNullException("data cannot be null.");
+			if (skeleton == null) throw new ArgumentNullException("skeleton cannot be null.");
+			this.data = data;
+			mix = data.mix;
+			bendDirection = data.bendDirection;
+
+			bones = new List<Bone>(data.bones.Count);
+			foreach (BoneData boneData in data.bones)
+				bones.Add(skeleton.FindBone(boneData.name));
+			target = skeleton.FindBone(data.target.name);
+		}
+
+		public void apply () {
+			Bone target = this.target;
+			List<Bone> bones = this.bones;
+			switch (bones.Count) {
+			case 1:
+				apply(bones[0], target.worldX, target.worldY, mix);
+				break;
+			case 2:
+				apply(bones[0], bones[1], target.worldX, target.worldY, bendDirection, mix);
+				break;
+			}
+		}
+
+		override public String ToString () {
+			return data.name;
+		}
+
+		/// <summary>Adjusts the bone rotation so the tip is as close to the target position as possible. The target is specified
+		/// in the world coordinate system.</summary>
+		static public void apply (Bone bone, float targetX, float targetY, float alpha) {
+			float parentRotation = (!bone.data.inheritRotation || bone.parent == null) ? 0 : bone.parent.worldRotation;
+			float rotation = bone.rotation;
+			float rotationIK = (float)Math.Atan2(targetY - bone.worldY, targetX - bone.worldX) * radDeg;
+			if (bone.worldFlipX != (bone.worldFlipY != Bone.yDown)) rotationIK = -rotationIK;
+			rotationIK -= parentRotation;
+			bone.rotationIK = rotation + (rotationIK - rotation) * alpha;
+		}
+
+		/// <summary>Adjusts the parent and child bone rotations so the tip of the child is as close to the target position as
+		/// possible. The target is specified in the world coordinate system.</summary>
+		/// <param name="child">Any descendant bone of the parent.</param>
+		static public void apply (Bone parent, Bone child, float targetX, float targetY, int bendDirection, float alpha) {
+			float childRotation = child.rotation, parentRotation = parent.rotation;
+			if (alpha == 0) {
+				child.rotationIK = childRotation;
+				parent.rotationIK = parentRotation;
+				return;
+			}
+			float positionX, positionY;
+			Bone parentParent = parent.parent;
+			if (parentParent != null) {
+				parentParent.worldToLocal(targetX, targetY, out positionX, out positionY);
+				targetX = (positionX - parent.x) * parentParent.worldScaleX;
+				targetY = (positionY - parent.y) * parentParent.worldScaleY;
+			} else {
+				targetX -= parent.x;
+				targetY -= parent.y;
+			}
+			if (child.parent == parent) {
+				positionX = child.x;
+				positionY = child.y;
+			} else {
+				child.parent.localToWorld(child.x, child.y, out positionX, out positionY);
+				parent.worldToLocal(positionX, positionY, out positionX, out positionY);
+			}
+			float childX = positionX * parent.worldScaleX, childY = positionY * parent.worldScaleY;
+			float offset = (float)Math.Atan2(childY, childX);
+			float len1 = (float)Math.Sqrt(childX * childX + childY * childY), len2 = child.data.length * child.worldScaleX;
+			// Based on code by Ryan Juckett with permission: Copyright (c) 2008-2009 Ryan Juckett, http://www.ryanjuckett.com/
+			float cosDenom = 2 * len1 * len2;
+			if (cosDenom < 0.0001f) {
+				child.rotationIK = childRotation + ((float)Math.Atan2(targetY, targetX) * radDeg - parentRotation - childRotation)
+					* alpha;
+				return;
+			}
+			float cos = (targetX * targetX + targetY * targetY - len1 * len1 - len2 * len2) / cosDenom;
+			if (cos < -1)
+				cos = -1;
+			else if (cos > 1)
+				cos = 1;
+			float childAngle = (float)Math.Acos(cos) * bendDirection;
+			float adjacent = len1 + len2 * cos, opposite = len2 * (float)Math.Sin(childAngle);
+			float parentAngle = (float)Math.Atan2(targetY * adjacent - targetX * opposite, targetX * adjacent + targetY * opposite);
+			float rotation = (parentAngle - offset) * radDeg - parentRotation;
+			if (rotation > 180)
+				rotation -= 360;
+			else if (rotation < -180) //
+				rotation += 360;
+			parent.rotationIK = parentRotation + rotation * alpha;
+			rotation = (childAngle + offset) * radDeg - childRotation;
+			if (rotation > 180)
+				rotation -= 360;
+			else if (rotation < -180) //
+				rotation += 360;
+			child.rotationIK = childRotation + (rotation + parent.worldRotation - child.parent.worldRotation) * alpha;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/IkConstraintData.cs

@@ -0,0 +1,57 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	public class IkConstraintData {
+		internal String name;
+		internal List<BoneData> bones = new List<BoneData>();
+		internal BoneData target;
+		internal int bendDirection = 1;
+		internal float mix = 1;
+
+		public String Name { get { return name; } }
+		public List<BoneData> Bones { get { return bones; } }
+		public BoneData Target { get { return target; } set { target = value; } }
+		public int BendDirection { get { return bendDirection; } set { bendDirection = value; } }
+		public float Mix { get { return mix; } set { mix = value; } }
+
+		public IkConstraintData (String name) {
+			if (name == null) throw new ArgumentNullException("name cannot be null.");
+			this.name = name;
+		}
+
+		override public String ToString () {
+			return name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Json.cs

@@ -0,0 +1,542 @@
+/*
+ * Copyright (c) 2012 Calvin Rien
+ *
+ * Based on the JSON parser by Patrick van Bergen
+ * http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
+ *
+ * Simplified it so that it doesn't throw exceptions
+ * and can be used in Unity iPhone with maximum code stripping.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+using System.Globalization;
+ 
+namespace SpineRuntime21
+{
+    // Example usage:
+    //
+    //  using UnityEngine;
+    //  using System.Collections;
+    //  using System.Collections.Generic;
+    //  using MiniJSON;
+    //
+    //  public class MiniJSONTest : MonoBehaviour {
+    //      void Start () {
+    //          var jsonString = "{ \"array\": [1.44,2,3], " +
+    //                          "\"object\": {\"key1\":\"value1\", \"key2\":256}, " +
+    //                          "\"string\": \"The quick brown fox \\\"jumps\\\" over the lazy dog \", " +
+    //                          "\"unicode\": \"\\u3041 Men\u00fa sesi\u00f3n\", " +
+    //                          "\"int\": 65536, " +
+    //                          "\"float\": 3.1415926, " +
+    //                          "\"bool\": true, " +
+    //                          "\"null\": null }";
+    //
+    //          var dict = Json.Deserialize(jsonString) as Dictionary<string,object>;
+    //
+    //          Debug.Log("deserialized: " + dict.GetType());
+    //          Debug.Log("dict['array'][0]: " + ((List<object>) dict["array"])[0]);
+    //          Debug.Log("dict['string']: " + (string) dict["string"]);
+	 //          Debug.Log("dict['float']: " + (float) dict["float"]);
+    //          Debug.Log("dict['int']: " + (long) dict["int"]); // ints come out as longs
+    //          Debug.Log("dict['unicode']: " + (string) dict["unicode"]);
+    //
+    //          var str = Json.Serialize(dict);
+    //
+    //          Debug.Log("serialized: " + str);
+    //      }
+    //  }
+ 
+    /// <summary>
+    /// This class encodes and decodes JSON strings.
+    /// Spec. details, see http://www.json.org/
+    ///
+    /// JSON uses Arrays and Objects. These correspond here to the datatypes IList and IDictionary.
+    /// All numbers are parsed to floats.
+    /// </summary>
+    public static class Json {
+        /// <summary>
+        /// Parses the string json into a value
+        /// </summary>
+        /// <param name="json">A JSON string.</param>
+		 /// <returns>An List&lt;object&gt;, a Dictionary&lt;string, object&gt;, a float, an integer,a string, null, true, or false</returns>
+		 public static object Deserialize (TextReader json) {
+            if (json == null) {
+                return null;
+            } 
+            return Parser.Parse(json);
+        }
+ 
+        sealed class Parser : IDisposable {
+            const string WHITE_SPACE = " \t\n\r";
+            const string WORD_BREAK = " \t\n\r{}[],:\"";
+ 
+            enum TOKEN {
+                NONE,
+                CURLY_OPEN,
+                CURLY_CLOSE,
+                SQUARED_OPEN,
+                SQUARED_CLOSE,
+                COLON,
+                COMMA,
+                STRING,
+                NUMBER,
+                TRUE,
+                FALSE,
+                NULL
+            };
+ 
+            TextReader json;
+ 
+            Parser(TextReader reader) {
+					json = reader;
+            }
+
+				public static object Parse (TextReader reader) {
+                using (var instance = new Parser(reader)) {
+                    return instance.ParseValue();
+                }
+            }
+ 
+            public void Dispose() {
+                json.Dispose();
+                json = null;
+            }
+ 
+            Dictionary<string, object> ParseObject() {
+                Dictionary<string, object> table = new Dictionary<string, object>();
+ 
+                // ditch opening brace
+                json.Read();
+ 
+                // {
+                while (true) {
+                    switch (NextToken) {
+                    case TOKEN.NONE:
+                        return null;
+                    case TOKEN.COMMA:
+                        continue;
+                    case TOKEN.CURLY_CLOSE:
+                        return table;
+                    default:
+                        // name
+                        string name = ParseString();
+                        if (name == null) {
+                            return null;
+                        }
+ 
+                        // :
+                        if (NextToken != TOKEN.COLON) {
+                            return null;
+                        }
+                        // ditch the colon
+                        json.Read();
+ 
+                        // value
+                        table[name] = ParseValue();
+                        break;
+                    }
+                }
+            }
+ 
+            List<object> ParseArray() {
+                List<object> array = new List<object>();
+ 
+                // ditch opening bracket
+                json.Read();
+ 
+                // [
+                var parsing = true;
+                while (parsing) {
+                    TOKEN nextToken = NextToken;
+ 
+                    switch (nextToken) {
+                    case TOKEN.NONE:
+                        return null;
+                    case TOKEN.COMMA:
+                        continue;
+                    case TOKEN.SQUARED_CLOSE:
+                        parsing = false;
+                        break;
+                    default:
+                        object value = ParseByToken(nextToken);
+ 
+                        array.Add(value);
+                        break;
+                    }
+                }
+ 
+                return array;
+            }
+ 
+            object ParseValue() {
+                TOKEN nextToken = NextToken;
+                return ParseByToken(nextToken);
+            }
+ 
+            object ParseByToken(TOKEN token) {
+                switch (token) {
+                case TOKEN.STRING:
+                    return ParseString();
+                case TOKEN.NUMBER:
+                    return ParseNumber();
+                case TOKEN.CURLY_OPEN:
+                    return ParseObject();
+                case TOKEN.SQUARED_OPEN:
+                    return ParseArray();
+                case TOKEN.TRUE:
+                    return true;
+                case TOKEN.FALSE:
+                    return false;
+                case TOKEN.NULL:
+                    return null;
+                default:
+                    return null;
+                }
+            }
+ 
+            string ParseString() {
+                StringBuilder s = new StringBuilder();
+                char c;
+ 
+                // ditch opening quote
+                json.Read();
+ 
+                bool parsing = true;
+                while (parsing) {
+ 
+                    if (json.Peek() == -1) {
+                        parsing = false;
+                        break;
+                    }
+ 
+                    c = NextChar;
+                    switch (c) {
+                    case '"':
+                        parsing = false;
+                        break;
+                    case '\\':
+                        if (json.Peek() == -1) {
+                            parsing = false;
+                            break;
+                        }
+ 
+                        c = NextChar;
+                        switch (c) {
+                        case '"':
+                        case '\\':
+                        case '/':
+                            s.Append(c);
+                            break;
+                        case 'b':
+                            s.Append('\b');
+                            break;
+                        case 'f':
+                            s.Append('\f');
+                            break;
+                        case 'n':
+                            s.Append('\n');
+                            break;
+                        case 'r':
+                            s.Append('\r');
+                            break;
+                        case 't':
+                            s.Append('\t');
+                            break;
+                        case 'u':
+                            var hex = new StringBuilder();
+ 
+                            for (int i=0; i< 4; i++) {
+                                hex.Append(NextChar);
+                            }
+ 
+                            s.Append((char) Convert.ToInt32(hex.ToString(), 16));
+                            break;
+                        }
+                        break;
+                    default:
+                        s.Append(c);
+                        break;
+                    }
+                }
+ 
+                return s.ToString();
+            }
+ 
+            object ParseNumber() {
+                string number = NextWord;
+					 float parsedFloat;
+					 float.TryParse(number, NumberStyles.Float, CultureInfo.InvariantCulture, out parsedFloat); 
+					 return parsedFloat;
+            }
+ 
+            void EatWhitespace() {
+                while (WHITE_SPACE.IndexOf(PeekChar) != -1) {
+                    json.Read();
+ 
+                    if (json.Peek() == -1) {
+                        break;
+                    }
+                }
+            }
+ 
+            char PeekChar {
+                get {
+                    return Convert.ToChar(json.Peek());
+                }
+            }
+ 
+            char NextChar {
+                get {
+                    return Convert.ToChar(json.Read());
+                }
+            }
+ 
+            string NextWord {
+                get {
+                    StringBuilder word = new StringBuilder();
+ 
+                    while (WORD_BREAK.IndexOf(PeekChar) == -1) {
+                        word.Append(NextChar);
+ 
+                        if (json.Peek() == -1) {
+                            break;
+                        }
+                    }
+ 
+                    return word.ToString();
+                }
+            }
+ 
+            TOKEN NextToken {
+                get {
+                    EatWhitespace();
+ 
+                    if (json.Peek() == -1) {
+                        return TOKEN.NONE;
+                    }
+ 
+                    char c = PeekChar;
+                    switch (c) {
+                    case '{':
+                        return TOKEN.CURLY_OPEN;
+                    case '}':
+                        json.Read();
+                        return TOKEN.CURLY_CLOSE;
+                    case '[':
+                        return TOKEN.SQUARED_OPEN;
+                    case ']':
+                        json.Read();
+                        return TOKEN.SQUARED_CLOSE;
+                    case ',':
+                        json.Read();
+                        return TOKEN.COMMA;
+                    case '"':
+                        return TOKEN.STRING;
+                    case ':':
+                        return TOKEN.COLON;
+                    case '0':
+                    case '1':
+                    case '2':
+                    case '3':
+                    case '4':
+                    case '5':
+                    case '6':
+                    case '7':
+                    case '8':
+                    case '9':
+                    case '-':
+                        return TOKEN.NUMBER;
+                    }
+ 
+                    string word = NextWord;
+ 
+                    switch (word) {
+                    case "false":
+                        return TOKEN.FALSE;
+                    case "true":
+                        return TOKEN.TRUE;
+                    case "null":
+                        return TOKEN.NULL;
+                    }
+ 
+                    return TOKEN.NONE;
+                }
+            }
+        }
+ 
+        /// <summary>
+        /// Converts a IDictionary / IList object or a simple type (string, int, etc.) into a JSON string
+        /// </summary>
+        /// <param name="json">A Dictionary&lt;string, object&gt; / List&lt;object&gt;</param>
+        /// <returns>A JSON encoded string, or null if object 'json' is not serializable</returns>
+        public static string Serialize(object obj) {
+            return Serializer.Serialize(obj);
+        }
+ 
+        sealed class Serializer {
+            StringBuilder builder;
+ 
+            Serializer() {
+                builder = new StringBuilder();
+            }
+ 
+            public static string Serialize(object obj) {
+                var instance = new Serializer();
+ 
+                instance.SerializeValue(obj);
+ 
+                return instance.builder.ToString();
+            }
+ 
+            void SerializeValue(object value) {
+                IList asList;
+                IDictionary asDict;
+                string asStr;
+ 
+                if (value == null) {
+                    builder.Append("null");
+                }
+                else if ((asStr = value as string) != null) {
+                    SerializeString(asStr);
+                }
+                else if (value is bool) {
+                    builder.Append(value.ToString().ToLower());
+                }
+                else if ((asList = value as IList) != null) {
+                    SerializeArray(asList);
+                }
+                else if ((asDict = value as IDictionary) != null) {
+                    SerializeObject(asDict);
+                }
+                else if (value is char) {
+                    SerializeString(value.ToString());
+                }
+                else {
+                    SerializeOther(value);
+                }
+            }
+ 
+            void SerializeObject(IDictionary obj) {
+                bool first = true;
+ 
+                builder.Append('{');
+ 
+                foreach (object e in obj.Keys) {
+                    if (!first) {
+                        builder.Append(',');
+                    }
+ 
+                    SerializeString(e.ToString());
+                    builder.Append(':');
+ 
+                    SerializeValue(obj[e]);
+ 
+                    first = false;
+                }
+ 
+                builder.Append('}');
+            }
+ 
+            void SerializeArray(IList anArray) {
+                builder.Append('[');
+ 
+                bool first = true;
+ 
+                foreach (object obj in anArray) {
+                    if (!first) {
+                        builder.Append(',');
+                    }
+ 
+                    SerializeValue(obj);
+ 
+                    first = false;
+                }
+ 
+                builder.Append(']');
+            }
+ 
+            void SerializeString(string str) {
+                builder.Append('\"');
+ 
+                char[] charArray = str.ToCharArray();
+                foreach (var c in charArray) {
+                    switch (c) {
+                    case '"':
+                        builder.Append("\\\"");
+                        break;
+                    case '\\':
+                        builder.Append("\\\\");
+                        break;
+                    case '\b':
+                        builder.Append("\\b");
+                        break;
+                    case '\f':
+                        builder.Append("\\f");
+                        break;
+                    case '\n':
+                        builder.Append("\\n");
+                        break;
+                    case '\r':
+                        builder.Append("\\r");
+                        break;
+                    case '\t':
+                        builder.Append("\\t");
+                        break;
+                    default:
+                        int codepoint = Convert.ToInt32(c);
+                        if ((codepoint >= 32) && (codepoint <= 126)) {
+                            builder.Append(c);
+                        }
+                        else {
+                            builder.Append("\\u" + Convert.ToString(codepoint, 16).PadLeft(4, '0'));
+                        }
+                        break;
+                    }
+                }
+ 
+                builder.Append('\"');
+            }
+ 
+            void SerializeOther(object value) {
+                if (value is float
+                    || value is int
+                    || value is uint
+                    || value is long
+						  || value is float
+                    || value is sbyte
+                    || value is byte
+                    || value is short
+                    || value is ushort
+                    || value is ulong
+                    || value is decimal) {
+                    builder.Append(value.ToString());
+                }
+                else {
+                    SerializeString(value.ToString());
+                }
+            }
+        }
+    }
+}

SpineRuntimes/SpineRuntime21/Skeleton.cs

@@ -0,0 +1,306 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	public class Skeleton {
+		internal SkeletonData data;
+		internal List<Bone> bones;
+		internal List<Slot> slots;
+		internal List<Slot> drawOrder;
+		internal List<IkConstraint> ikConstraints;
+		private List<List<Bone>> boneCache = new List<List<Bone>>();
+		internal Skin skin;
+		internal float r = 1, g = 1, b = 1, a = 1;
+		internal float time;
+		internal bool flipX, flipY;
+		internal float x, y;
+
+		public SkeletonData Data { get { return data; } }
+		public List<Bone> Bones { get { return bones; } }
+		public List<Slot> Slots { get { return slots; } }
+		public List<Slot> DrawOrder { get { return drawOrder; } }
+		public List<IkConstraint> IkConstraints { get { return ikConstraints; } set { ikConstraints = value; } }
+		public Skin Skin { get { return skin; } set { skin = value; } }
+		public float R { get { return r; } set { r = value; } }
+		public float G { get { return g; } set { g = value; } }
+		public float B { get { return b; } set { b = value; } }
+		public float A { get { return a; } set { a = value; } }
+		public float Time { get { return time; } set { time = value; } }
+		public float X { get { return x; } set { x = value; } }
+		public float Y { get { return y; } set { y = value; } }
+		public bool FlipX { get { return flipX; } set { flipX = value; } }
+		public bool FlipY { get { return flipY; } set { flipY = value; } }
+
+		public Bone RootBone {
+			get {
+				return bones.Count == 0 ? null : bones[0];
+			}
+		}
+
+		public Skeleton (SkeletonData data) {
+			if (data == null) throw new ArgumentNullException("data cannot be null.");
+			this.data = data;
+
+			bones = new List<Bone>(data.bones.Count);
+			foreach (BoneData boneData in data.bones) {
+				Bone parent = boneData.parent == null ? null : bones[data.bones.IndexOf(boneData.parent)];
+				Bone bone = new Bone(boneData, this, parent);
+				if (parent != null) parent.children.Add(bone);
+				bones.Add(bone);
+			}
+
+			slots = new List<Slot>(data.slots.Count);
+			drawOrder = new List<Slot>(data.slots.Count);
+			foreach (SlotData slotData in data.slots) {
+				Bone bone = bones[data.bones.IndexOf(slotData.boneData)];
+				Slot slot = new Slot(slotData, bone);
+				slots.Add(slot);
+				drawOrder.Add(slot);
+			}
+
+			ikConstraints = new List<IkConstraint>(data.ikConstraints.Count);
+			foreach (IkConstraintData ikConstraintData in data.ikConstraints)
+				ikConstraints.Add(new IkConstraint(ikConstraintData, this));
+
+			UpdateCache();
+		}
+
+		/// <summary>Caches information about bones and IK constraints. Must be called if bones or IK constraints are added or
+		/// removed.</summary>
+		public void UpdateCache () {
+			List<List<Bone>> boneCache = this.boneCache;
+			List<IkConstraint> ikConstraints = this.ikConstraints;
+			int ikConstraintsCount = ikConstraints.Count;
+
+			int arrayCount = ikConstraintsCount + 1;
+			if (boneCache.Count > arrayCount) boneCache.RemoveRange(arrayCount, boneCache.Count - arrayCount);
+			for (int i = 0, n = boneCache.Count; i < n; i++)
+				boneCache[i].Clear();
+			while (boneCache.Count < arrayCount)
+				boneCache.Add(new List<Bone>());
+
+			List<Bone> nonIkBones = boneCache[0];
+
+			for (int i = 0, n = bones.Count; i < n; i++) {
+				Bone bone = bones[i];
+				Bone current = bone;
+				do {
+					for (int ii = 0; ii < ikConstraintsCount; ii++) {
+						IkConstraint ikConstraint = ikConstraints[ii];
+						Bone parent = ikConstraint.bones[0];
+						Bone child = ikConstraint.bones[ikConstraint.bones.Count - 1];
+						while (true) {
+							if (current == child) {
+								boneCache[ii].Add(bone);
+								boneCache[ii + 1].Add(bone);
+								goto outer;
+							}
+							if (child == parent) break;
+							child = child.parent;
+						}
+					}
+					current = current.parent;
+				} while (current != null);
+				nonIkBones.Add(bone);
+				outer: {}
+			}
+		}
+
+		/// <summary>Updates the world transform for each bone and applies IK constraints.</summary>
+		public void UpdateWorldTransform () {
+			List<Bone> bones = this.bones;
+			for (int ii = 0, nn = bones.Count; ii < nn; ii++) {
+				Bone bone = bones[ii];
+				bone.rotationIK = bone.rotation;
+			}
+			List<List<Bone>> boneCache = this.boneCache;
+			List<IkConstraint> ikConstraints = this.ikConstraints;
+			int i = 0, last = boneCache.Count - 1;
+			while (true) {
+				List<Bone> updateBones = boneCache[i];
+				for (int ii = 0, nn = updateBones.Count; ii < nn; ii++)
+					updateBones[ii].UpdateWorldTransform();
+				if (i == last) break;
+				ikConstraints[i].apply();
+				i++;
+			}
+		}
+
+		/// <summary>Sets the bones and slots to their setup pose values.</summary>
+		public void SetToSetupPose () {
+			SetBonesToSetupPose();
+			SetSlotsToSetupPose();
+		}
+
+		public void SetBonesToSetupPose () {
+			List<Bone> bones = this.bones;
+			for (int i = 0, n = bones.Count; i < n; i++)
+				bones[i].SetToSetupPose();
+
+			List<IkConstraint> ikConstraints = this.ikConstraints;
+			for (int i = 0, n = ikConstraints.Count; i < n; i++) {
+				IkConstraint ikConstraint = ikConstraints[i];
+				ikConstraint.bendDirection = ikConstraint.data.bendDirection;
+				ikConstraint.mix = ikConstraint.data.mix;
+			}
+		}
+
+		public void SetSlotsToSetupPose () {
+			List<Slot> slots = this.slots;
+			drawOrder.Clear();
+			drawOrder.AddRange(slots);
+			for (int i = 0, n = slots.Count; i < n; i++)
+				slots[i].SetToSetupPose(i);
+		}
+
+		/// <returns>May be null.</returns>
+		public Bone FindBone (String boneName) {
+			if (boneName == null) throw new ArgumentNullException("boneName cannot be null.");
+			List<Bone> bones = this.bones;
+			for (int i = 0, n = bones.Count; i < n; i++) {
+				Bone bone = bones[i];
+				if (bone.data.name == boneName) return bone;
+			}
+			return null;
+		}
+
+		/// <returns>-1 if the bone was not found.</returns>
+		public int FindBoneIndex (String boneName) {
+			if (boneName == null) throw new ArgumentNullException("boneName cannot be null.");
+			List<Bone> bones = this.bones;
+			for (int i = 0, n = bones.Count; i < n; i++)
+				if (bones[i].data.name == boneName) return i;
+			return -1;
+		}
+
+		/// <returns>May be null.</returns>
+		public Slot FindSlot (String slotName) {
+			if (slotName == null) throw new ArgumentNullException("slotName cannot be null.");
+			List<Slot> slots = this.slots;
+			for (int i = 0, n = slots.Count; i < n; i++) {
+				Slot slot = slots[i];
+				if (slot.data.name == slotName) return slot;
+			}
+			return null;
+		}
+
+		/// <returns>-1 if the bone was not found.</returns>
+		public int FindSlotIndex (String slotName) {
+			if (slotName == null) throw new ArgumentNullException("slotName cannot be null.");
+			List<Slot> slots = this.slots;
+			for (int i = 0, n = slots.Count; i < n; i++)
+				if (slots[i].data.name.Equals(slotName)) return i;
+			return -1;
+		}
+
+		/// <summary>Sets a skin by name (see SetSkin).</summary>
+		public void SetSkin (String skinName) {
+			Skin skin = data.FindSkin(skinName);
+			if (skin == null) throw new ArgumentException("Skin not found: " + skinName);
+			SetSkin(skin);
+		}
+
+		/// <summary>Sets the skin used to look up attachments before looking in the {@link SkeletonData#getDefaultSkin() default 
+		/// skin}. Attachmentsfrom the new skin are attached if the corresponding attachment from the old skin was attached. If 
+		/// there was no old skin, each slot's setup mode attachment is attached from the new skin.</summary>
+		/// <param name="newSkin">May be null.</param>
+		public void SetSkin (Skin newSkin) {
+			if (newSkin != null) {
+				if (skin != null)
+					newSkin.AttachAll(this, skin);
+				else {
+					List<Slot> slots = this.slots;
+					for (int i = 0, n = slots.Count; i < n; i++) {
+						Slot slot = slots[i];
+						String name = slot.data.attachmentName;
+						if (name != null) {
+							Attachment attachment = newSkin.GetAttachment(i, name);
+							if (attachment != null) slot.Attachment = attachment;
+						}
+					}
+				}
+			}
+			skin = newSkin;
+		}
+
+		/// <returns>May be null.</returns>
+		public Attachment GetAttachment (String slotName, String attachmentName) {
+			return GetAttachment(data.FindSlotIndex(slotName), attachmentName);
+		}
+
+		/// <returns>May be null.</returns>
+		public Attachment GetAttachment (int slotIndex, String attachmentName) {
+			if (attachmentName == null) throw new ArgumentNullException("attachmentName cannot be null.");
+			if (skin != null) {
+				Attachment attachment = skin.GetAttachment(slotIndex, attachmentName);
+				if (attachment != null) return attachment;
+			}
+			if (data.defaultSkin != null) return data.defaultSkin.GetAttachment(slotIndex, attachmentName);
+			return null;
+		}
+
+		/// <param name="attachmentName">May be null.</param>
+		public void SetAttachment (String slotName, String attachmentName) {
+			if (slotName == null) throw new ArgumentNullException("slotName cannot be null.");
+			List<Slot> slots = this.slots;
+			for (int i = 0, n = slots.Count; i < n; i++) {
+				Slot slot = slots[i];
+				if (slot.data.name == slotName) {
+					Attachment attachment = null;
+					if (attachmentName != null) {
+						attachment = GetAttachment(i, attachmentName);
+						if (attachment == null) throw new Exception("Attachment not found: " + attachmentName + ", for slot: " + slotName);
+					}
+					slot.Attachment = attachment;
+					return;
+				}
+			}
+			throw new Exception("Slot not found: " + slotName);
+		}
+
+		/** @return May be null. */
+		public IkConstraint FindIkConstraint (String ikConstraintName) {
+			if (ikConstraintName == null) throw new ArgumentNullException("ikConstraintName cannot be null.");
+			List<IkConstraint> ikConstraints = this.ikConstraints;
+			for (int i = 0, n = ikConstraints.Count; i < n; i++) {
+				IkConstraint ikConstraint = ikConstraints[i];
+				if (ikConstraint.data.name == ikConstraintName) return ikConstraint;
+			}
+			return null;
+		}
+
+		public void Update (float delta) {
+			time += delta;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/SkeletonBinary.cs

@@ -0,0 +1,663 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.IO;
+using System.Collections.Generic;
+
+#if WINDOWS_STOREAPP
+using System.Threading.Tasks;
+using Windows.Storage;
+#endif
+
+namespace SpineRuntime21 {
+	public class SkeletonBinary {
+		public const int TIMELINE_SCALE = 0;
+		public const int TIMELINE_ROTATE = 1;
+		public const int TIMELINE_TRANSLATE = 2;
+		public const int TIMELINE_ATTACHMENT = 3;
+		public const int TIMELINE_COLOR = 4;
+		public const int TIMELINE_FLIPX = 5;
+		public const int TIMELINE_FLIPY = 6;
+
+		public const int CURVE_LINEAR = 0;
+		public const int CURVE_STEPPED = 1;
+		public const int CURVE_BEZIER = 2;
+
+		private AttachmentLoader attachmentLoader;
+		public float Scale { get; set; }
+		private char[] chars = new char[32];
+		private byte[] buffer = new byte[4];
+
+		public SkeletonBinary (params Atlas[] atlasArray)
+			: this(new AtlasAttachmentLoader(atlasArray)) {
+		}
+
+		public SkeletonBinary (AttachmentLoader attachmentLoader) {
+			if (attachmentLoader == null) throw new ArgumentNullException("attachmentLoader cannot be null.");
+			this.attachmentLoader = attachmentLoader;
+			Scale = 1;
+		}
+
+#if WINDOWS_STOREAPP
+		private async Task<SkeletonData> ReadFile(string path) {
+			var folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
+			using (var input = new BufferedStream(await folder.GetFileAsync(path).AsTask().ConfigureAwait(false))) {
+				SkeletonData skeletonData = ReadSkeletonData(input);
+				skeletonData.Name = Path.GetFileNameWithoutExtension(path);
+				return skeletonData;
+			}
+		}
+
+		public SkeletonData ReadSkeletonData (String path) {
+			return this.ReadFile(path).Result;
+		}
+#else
+		public SkeletonData ReadSkeletonData (String path) {
+#if WINDOWS_PHONE
+			using (var input = new BufferedStream(Microsoft.Xna.Framework.TitleContainer.OpenStream(path)))
+			{
+#else
+			using (var input = new BufferedStream(new FileStream(path, FileMode.Open))) {
+#endif
+				SkeletonData skeletonData = ReadSkeletonData(input);
+				skeletonData.name = Path.GetFileNameWithoutExtension(path);
+				return skeletonData;
+			}
+		}
+#endif
+
+		public SkeletonData ReadSkeletonData (Stream input) {
+			if (input == null) throw new ArgumentNullException("input cannot be null.");
+			float scale = Scale;
+
+			var skeletonData = new SkeletonData();
+			skeletonData.hash = ReadString(input);
+			if (skeletonData.hash.Length == 0) skeletonData.hash = null;
+			skeletonData.version = ReadString(input);
+			if (skeletonData.version.Length == 0) skeletonData.version = null;
+			skeletonData.width = ReadFloat(input);
+			skeletonData.height = ReadFloat(input);
+
+			bool nonessential = ReadBoolean(input);
+
+			if (nonessential) {
+				skeletonData.imagesPath = ReadString(input);
+				if (skeletonData.imagesPath.Length == 0) skeletonData.imagesPath = null;
+			}
+
+			// Bones.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++) {
+				String name = ReadString(input);
+				BoneData parent = null;
+				int parentIndex = ReadInt(input, true) - 1;
+				if (parentIndex != -1) parent = skeletonData.bones[parentIndex];
+				BoneData boneData = new BoneData(name, parent);
+				boneData.x = ReadFloat(input) * scale;
+				boneData.y = ReadFloat(input) * scale;
+				boneData.scaleX = ReadFloat(input);
+				boneData.scaleY = ReadFloat(input);
+				boneData.rotation = ReadFloat(input);
+				boneData.length = ReadFloat(input) * scale;
+				boneData.flipX = ReadBoolean(input);
+				boneData.flipY = ReadBoolean(input);
+				boneData.inheritScale = ReadBoolean(input);
+				boneData.inheritRotation = ReadBoolean(input);
+				if (nonessential) ReadInt(input); // Skip bone color.
+				skeletonData.bones.Add(boneData);
+			}
+
+			// IK constraints.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++) {
+				IkConstraintData ikConstraintData = new IkConstraintData(ReadString(input));
+				for (int ii = 0, nn = ReadInt(input, true); ii < nn; ii++)
+					ikConstraintData.bones.Add(skeletonData.bones[ReadInt(input, true)]);
+				ikConstraintData.target = skeletonData.bones[ReadInt(input, true)];
+				ikConstraintData.mix = ReadFloat(input);
+				ikConstraintData.bendDirection = ReadSByte(input);
+				skeletonData.ikConstraints.Add(ikConstraintData);
+			}
+
+			// Slots.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++) {
+				String slotName = ReadString(input);
+				BoneData boneData = skeletonData.bones[ReadInt(input, true)];
+				SlotData slotData = new SlotData(slotName, boneData);
+				int color = ReadInt(input);
+				slotData.r = ((color & 0xff000000) >> 24) / 255f;
+				slotData.g = ((color & 0x00ff0000) >> 16) / 255f;
+				slotData.b = ((color & 0x0000ff00) >> 8) / 255f;
+				slotData.a = ((color & 0x000000ff)) / 255f;
+				slotData.attachmentName = ReadString(input);
+				slotData.additiveBlending = ReadBoolean(input);
+				skeletonData.slots.Add(slotData);
+			}
+
+			// Default skin.
+			Skin defaultSkin = ReadSkin(input, "default", nonessential);
+			if (defaultSkin != null) {
+				skeletonData.defaultSkin = defaultSkin;
+				skeletonData.skins.Add(defaultSkin);
+			}
+
+			// Skins.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++)
+				skeletonData.skins.Add(ReadSkin(input, ReadString(input), nonessential));
+
+			// Events.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++) {
+				EventData eventData = new EventData(ReadString(input));
+				eventData.Int = ReadInt(input, false);
+				eventData.Float = ReadFloat(input);
+				eventData.String = ReadString(input);
+				skeletonData.events.Add(eventData);
+			}
+
+			// Animations.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++)
+				ReadAnimation(ReadString(input), input, skeletonData);
+
+			skeletonData.bones.TrimExcess();
+			skeletonData.slots.TrimExcess();
+			skeletonData.skins.TrimExcess();
+			skeletonData.events.TrimExcess();
+			skeletonData.animations.TrimExcess();
+			skeletonData.ikConstraints.TrimExcess();
+			return skeletonData;
+		}
+
+		/** @return May be null. */
+		private Skin ReadSkin (Stream input, String skinName, bool nonessential) {
+			int slotCount = ReadInt(input, true);
+			if (slotCount == 0) return null;
+			Skin skin = new Skin(skinName);
+			for (int i = 0; i < slotCount; i++) {
+				int slotIndex = ReadInt(input, true);
+				for (int ii = 0, nn = ReadInt(input, true); ii < nn; ii++) {
+					String name = ReadString(input);
+					skin.AddAttachment(slotIndex, name, ReadAttachment(input, skin, name, nonessential));
+				}
+			}
+			return skin;
+		}
+
+		private Attachment ReadAttachment (Stream input, Skin skin, String attachmentName, bool nonessential) {
+			float scale = Scale;
+
+			String name = ReadString(input);
+			if (name == null) name = attachmentName;
+
+			switch ((AttachmentType)input.ReadByte()) {
+			case AttachmentType.region: {
+				String path = ReadString(input);
+				if (path == null) path = name;
+				RegionAttachment region = attachmentLoader.NewRegionAttachment(skin, name, path);
+				if (region == null) return null;
+				region.Path = path;
+				region.x = ReadFloat(input) * scale;
+				region.y = ReadFloat(input) * scale;
+				region.scaleX = ReadFloat(input);
+				region.scaleY = ReadFloat(input);
+				region.rotation = ReadFloat(input);
+				region.width = ReadFloat(input) * scale;
+				region.height = ReadFloat(input) * scale;
+				int color = ReadInt(input);
+				region.r = ((color & 0xff000000) >> 24) / 255f;
+				region.g = ((color & 0x00ff0000) >> 16) / 255f;
+				region.b = ((color & 0x0000ff00) >> 8) / 255f;
+				region.a = ((color & 0x000000ff)) / 255f;
+				region.UpdateOffset();
+				return region;
+			}
+			case AttachmentType.boundingbox: {
+				BoundingBoxAttachment box = attachmentLoader.NewBoundingBoxAttachment(skin, name);
+				if (box == null) return null;
+				box.vertices = ReadFloatArray(input, scale);
+				return box;
+			}
+			case AttachmentType.mesh: {
+				String path = ReadString(input);
+				if (path == null) path = name;
+				MeshAttachment mesh = attachmentLoader.NewMeshAttachment(skin, name, path);
+				if (mesh == null) return null;
+				mesh.Path = path;
+				mesh.regionUVs = ReadFloatArray(input, 1);
+				mesh.triangles = ReadShortArray(input);
+				mesh.vertices = ReadFloatArray(input, scale);
+				mesh.UpdateUVs();
+				int color = ReadInt(input);
+				mesh.r = ((color & 0xff000000) >> 24) / 255f;
+				mesh.g = ((color & 0x00ff0000) >> 16) / 255f;
+				mesh.b = ((color & 0x0000ff00) >> 8) / 255f;
+				mesh.a = ((color & 0x000000ff)) / 255f;
+				mesh.HullLength = ReadInt(input, true) * 2;
+				if (nonessential) {
+					mesh.Edges = ReadIntArray(input);
+					mesh.Width = ReadFloat(input) * scale;
+					mesh.Height = ReadFloat(input) * scale;
+				}
+				return mesh;
+			}
+			case AttachmentType.skinnedmesh: {
+				String path = ReadString(input);
+				if (path == null) path = name;
+				SkinnedMeshAttachment mesh = attachmentLoader.NewSkinnedMeshAttachment(skin, name, path);
+				if (mesh == null) return null;
+				mesh.Path = path;
+				float[] uvs = ReadFloatArray(input, 1);
+				int[] triangles = ReadShortArray(input);
+
+				int vertexCount = ReadInt(input, true);
+				var weights = new List<float>(uvs.Length * 3 * 3);
+				var bones = new List<int>(uvs.Length * 3);
+				for (int i = 0; i < vertexCount; i++) {
+					int boneCount = (int)ReadFloat(input);
+					bones.Add(boneCount);
+					for (int nn = i + boneCount * 4; i < nn; i += 4) {
+						bones.Add((int)ReadFloat(input));
+						weights.Add(ReadFloat(input) * scale);
+						weights.Add(ReadFloat(input) * scale);
+						weights.Add(ReadFloat(input));
+					}
+				}
+				mesh.bones = bones.ToArray();
+				mesh.weights = weights.ToArray();
+				mesh.triangles = triangles;
+				mesh.regionUVs = uvs;
+				mesh.UpdateUVs();
+				int color = ReadInt(input);
+				mesh.r = ((color & 0xff000000) >> 24) / 255f;
+				mesh.g = ((color & 0x00ff0000) >> 16) / 255f;
+				mesh.b = ((color & 0x0000ff00) >> 8) / 255f;
+				mesh.a = ((color & 0x000000ff)) / 255f;
+				mesh.HullLength = ReadInt(input, true) * 2;
+				if (nonessential) {
+					mesh.Edges = ReadIntArray(input);
+					mesh.Width = ReadFloat(input) * scale;
+					mesh.Height = ReadFloat(input) * scale;
+				}
+				return mesh;
+			}
+			}
+			return null;
+		}
+
+		private float[] ReadFloatArray (Stream input, float scale) {
+			int n = ReadInt(input, true);
+			float[] array = new float[n];
+			if (scale == 1) {
+				for (int i = 0; i < n; i++)
+					array[i] = ReadFloat(input);
+			} else {
+				for (int i = 0; i < n; i++)
+					array[i] = ReadFloat(input) * scale;
+			}
+			return array;
+		}
+
+		private int[] ReadShortArray (Stream input) {
+			int n = ReadInt(input, true);
+			int[] array = new int[n];
+			for (int i = 0; i < n; i++)
+				array[i] = (input.ReadByte() << 8) + input.ReadByte();
+			return array;
+		}
+
+		private int[] ReadIntArray (Stream input) {
+			int n = ReadInt(input, true);
+			int[] array = new int[n];
+			for (int i = 0; i < n; i++)
+				array[i] = ReadInt(input, true);
+			return array;
+		}
+
+		private void ReadAnimation (String name, Stream input, SkeletonData skeletonData) {
+			var timelines = new List<Timeline>();
+			float scale = Scale;
+			float duration = 0;
+	
+			// Slot timelines.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++) {
+				int slotIndex = ReadInt(input, true);
+				for (int ii = 0, nn = ReadInt(input, true); ii < nn; ii++) {
+					int timelineType = input.ReadByte();
+					int frameCount = ReadInt(input, true);
+					switch (timelineType) {
+					case TIMELINE_COLOR: {
+						ColorTimeline timeline = new ColorTimeline(frameCount);
+						timeline.slotIndex = slotIndex;
+						for (int frameIndex = 0; frameIndex < frameCount; frameIndex++) {
+							float time = ReadFloat(input);
+							int color = ReadInt(input);
+							float r = ((color & 0xff000000) >> 24) / 255f;
+							float g = ((color & 0x00ff0000) >> 16) / 255f;
+							float b = ((color & 0x0000ff00) >> 8) / 255f;
+							float a = ((color & 0x000000ff)) / 255f;
+							timeline.SetFrame(frameIndex, time, r, g, b, a);
+							if (frameIndex < frameCount - 1) ReadCurve(input, frameIndex, timeline);
+						}
+						timelines.Add(timeline);
+						duration = Math.Max(duration, timeline.frames[frameCount * 5 - 5]);
+						break;
+					}
+					case TIMELINE_ATTACHMENT: {
+						AttachmentTimeline timeline = new AttachmentTimeline(frameCount);
+						timeline.slotIndex = slotIndex;
+						for (int frameIndex = 0; frameIndex < frameCount; frameIndex++)
+							timeline.SetFrame(frameIndex, ReadFloat(input), ReadString(input));
+						timelines.Add(timeline);
+						duration = Math.Max(duration, timeline.frames[frameCount - 1]);
+						break;
+					}
+					}
+				}
+			}
+
+			// Bone timelines.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++) {
+				int boneIndex = ReadInt(input, true);
+				for (int ii = 0, nn = ReadInt(input, true); ii < nn; ii++) {
+					int timelineType = input.ReadByte();
+					int frameCount = ReadInt(input, true);
+					switch (timelineType) {
+					case TIMELINE_ROTATE: {
+						RotateTimeline timeline = new RotateTimeline(frameCount);
+						timeline.boneIndex = boneIndex;
+						for (int frameIndex = 0; frameIndex < frameCount; frameIndex++) {
+							timeline.SetFrame(frameIndex, ReadFloat(input), ReadFloat(input));
+							if (frameIndex < frameCount - 1) ReadCurve(input, frameIndex, timeline);
+						}
+						timelines.Add(timeline);
+						duration = Math.Max(duration, timeline.frames[frameCount * 2 - 2]);
+						break;
+					}
+					case TIMELINE_TRANSLATE:
+					case TIMELINE_SCALE: {
+						TranslateTimeline timeline;
+						float timelineScale = 1;
+						if (timelineType == TIMELINE_SCALE)
+							timeline = new ScaleTimeline(frameCount);
+						else {
+							timeline = new TranslateTimeline(frameCount);
+							timelineScale = scale;
+						}
+						timeline.boneIndex = boneIndex;
+						for (int frameIndex = 0; frameIndex < frameCount; frameIndex++) {
+							timeline.SetFrame(frameIndex, ReadFloat(input), ReadFloat(input) * timelineScale, ReadFloat(input)
+								* timelineScale);
+							if (frameIndex < frameCount - 1) ReadCurve(input, frameIndex, timeline);
+						}
+						timelines.Add(timeline);
+						duration = Math.Max(duration, timeline.frames[frameCount * 3 - 3]);
+						break;
+					}
+					case TIMELINE_FLIPX:
+					case TIMELINE_FLIPY: {
+						FlipXTimeline timeline = timelineType == TIMELINE_FLIPX ? new FlipXTimeline(frameCount) : new FlipYTimeline(
+							frameCount);
+						timeline.boneIndex = boneIndex;
+						for (int frameIndex = 0; frameIndex < frameCount; frameIndex++)
+							timeline.SetFrame(frameIndex, ReadFloat(input), ReadBoolean(input));
+						timelines.Add(timeline);
+						duration = Math.Max(duration, timeline.frames[frameCount * 2 - 2]);
+						break;
+					}
+					}
+				}
+			}
+
+			// IK timelines.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++) {
+				IkConstraintData ikConstraint = skeletonData.ikConstraints[ReadInt(input, true)];
+				int frameCount = ReadInt(input, true);
+				IkConstraintTimeline timeline = new IkConstraintTimeline(frameCount);
+				timeline.ikConstraintIndex = skeletonData.ikConstraints.IndexOf(ikConstraint);
+				for (int frameIndex = 0; frameIndex < frameCount; frameIndex++) {
+					timeline.SetFrame(frameIndex, ReadFloat(input), ReadFloat(input), ReadSByte(input));
+					if (frameIndex < frameCount - 1) ReadCurve(input, frameIndex, timeline);
+				}
+				timelines.Add(timeline);
+				duration = Math.Max(duration, timeline.frames[frameCount * 3 - 3]);
+			}
+
+			// FFD timelines.
+			for (int i = 0, n = ReadInt(input, true); i < n; i++) {
+				Skin skin = skeletonData.skins[ReadInt(input, true)];
+				for (int ii = 0, nn = ReadInt(input, true); ii < nn; ii++) {
+					int slotIndex = ReadInt(input, true);
+					for (int iii = 0, nnn = ReadInt(input, true); iii < nnn; iii++) {
+						Attachment attachment = skin.GetAttachment(slotIndex, ReadString(input));
+						int frameCount = ReadInt(input, true);
+						FFDTimeline timeline = new FFDTimeline(frameCount);
+						timeline.slotIndex = slotIndex;
+						timeline.attachment = attachment;
+						for (int frameIndex = 0; frameIndex < frameCount; frameIndex++) {
+							float time = ReadFloat(input);
+
+							float[] vertices;
+							int vertexCount;
+							if (attachment is MeshAttachment)
+								vertexCount = ((MeshAttachment)attachment).vertices.Length;
+							else
+								vertexCount = ((SkinnedMeshAttachment)attachment).weights.Length / 3 * 2;
+
+							int end = ReadInt(input, true);
+							if (end == 0) {
+								if (attachment is MeshAttachment)
+									vertices = ((MeshAttachment)attachment).vertices;
+								else
+									vertices = new float[vertexCount];
+							} else {
+								vertices = new float[vertexCount];
+								int start = ReadInt(input, true);
+								end += start;
+								if (scale == 1) {
+									for (int v = start; v < end; v++)
+										vertices[v] = ReadFloat(input);
+								} else {
+									for (int v = start; v < end; v++)
+										vertices[v] = ReadFloat(input) * scale;
+								}
+								if (attachment is MeshAttachment) {
+									float[] meshVertices = ((MeshAttachment)attachment).vertices;
+									for (int v = 0, vn = vertices.Length; v < vn; v++)
+										vertices[v] += meshVertices[v];
+								}
+							}
+
+							timeline.SetFrame(frameIndex, time, vertices);
+							if (frameIndex < frameCount - 1) ReadCurve(input, frameIndex, timeline);
+						}
+						timelines.Add(timeline);
+						duration = Math.Max(duration, timeline.frames[frameCount - 1]);
+					}
+				}
+			}
+
+			// Draw order timeline.
+			int drawOrderCount = ReadInt(input, true);
+			if (drawOrderCount > 0) {
+				DrawOrderTimeline timeline = new DrawOrderTimeline(drawOrderCount);
+				int slotCount = skeletonData.slots.Count;
+				for (int i = 0; i < drawOrderCount; i++) {
+					int offsetCount = ReadInt(input, true);
+					int[] drawOrder = new int[slotCount];
+					for (int ii = slotCount - 1; ii >= 0; ii--)
+						drawOrder[ii] = -1;
+					int[] unchanged = new int[slotCount - offsetCount];
+					int originalIndex = 0, unchangedIndex = 0;
+					for (int ii = 0; ii < offsetCount; ii++) {
+						int slotIndex = ReadInt(input, true);
+						// Collect unchanged items.
+						while (originalIndex != slotIndex)
+							unchanged[unchangedIndex++] = originalIndex++;
+						// Set changed items.
+						drawOrder[originalIndex + ReadInt(input, true)] = originalIndex++;
+					}
+					// Collect remaining unchanged items.
+					while (originalIndex < slotCount)
+						unchanged[unchangedIndex++] = originalIndex++;
+					// Fill in unchanged items.
+					for (int ii = slotCount - 1; ii >= 0; ii--)
+						if (drawOrder[ii] == -1) drawOrder[ii] = unchanged[--unchangedIndex];
+					timeline.SetFrame(i, ReadFloat(input), drawOrder);
+				}
+				timelines.Add(timeline);
+				duration = Math.Max(duration, timeline.frames[drawOrderCount - 1]);
+			}
+
+			// Event timeline.
+			int eventCount = ReadInt(input, true);
+			if (eventCount > 0) {
+				EventTimeline timeline = new EventTimeline(eventCount);
+				for (int i = 0; i < eventCount; i++) {
+					float time = ReadFloat(input);
+					EventData eventData = skeletonData.events[ReadInt(input, true)];
+					Event e = new Event(eventData);
+					e.Int = ReadInt(input, false);
+					e.Float = ReadFloat(input);
+					e.String = ReadBoolean(input) ? ReadString(input) : eventData.String;
+					timeline.SetFrame(i, time, e);
+				}
+				timelines.Add(timeline);
+				duration = Math.Max(duration, timeline.frames[eventCount - 1]);
+			}
+
+			timelines.TrimExcess();
+			skeletonData.animations.Add(new Animation(name, timelines, duration));
+		}
+
+		private void ReadCurve (Stream input, int frameIndex, CurveTimeline timeline) {
+			switch (input.ReadByte()) {
+			case CURVE_STEPPED:
+				timeline.SetStepped(frameIndex);
+				break;
+			case CURVE_BEZIER:
+				timeline.SetCurve(frameIndex, ReadFloat(input), ReadFloat(input), ReadFloat(input), ReadFloat(input));
+				break;
+			}
+		}
+
+		private sbyte ReadSByte (Stream input) {
+			int value = input.ReadByte();
+			if (value == -1) throw new EndOfStreamException();
+			return (sbyte)value;
+		}
+
+		private bool ReadBoolean (Stream input) {
+			return input.ReadByte() != 0;
+		}
+
+		private float ReadFloat (Stream input) {
+			buffer[3] = (byte)input.ReadByte();
+			buffer[2] = (byte)input.ReadByte();
+			buffer[1] = (byte)input.ReadByte();
+			buffer[0] = (byte)input.ReadByte();
+			return BitConverter.ToSingle(buffer, 0);
+		}
+
+		private int ReadInt (Stream input) {
+			return (input.ReadByte() << 24) + (input.ReadByte() << 16) + (input.ReadByte() << 8) + input.ReadByte();
+		}
+
+		private int ReadInt (Stream input, bool optimizePositive) {
+			int b = input.ReadByte();
+			int result = b & 0x7F;
+			if ((b & 0x80) != 0) {
+				b = input.ReadByte();
+				result |= (b & 0x7F) << 7;
+				if ((b & 0x80) != 0) {
+					b = input.ReadByte();
+					result |= (b & 0x7F) << 14;
+					if ((b & 0x80) != 0) {
+						b = input.ReadByte();
+						result |= (b & 0x7F) << 21;
+						if ((b & 0x80) != 0) {
+							b = input.ReadByte();
+							result |= (b & 0x7F) << 28;
+						}
+					}
+				}
+			}
+			return optimizePositive ? result : ((result >> 1) ^ -(result & 1));
+		}
+
+		private string ReadString (Stream input) {
+			int charCount = ReadInt(input, true);
+			switch (charCount) {
+			case 0:
+				return null;
+			case 1:
+				return "";
+			}
+			charCount--;
+			char[] chars = this.chars;
+			if (chars.Length < charCount) this.chars = chars = new char[charCount];
+			// Try to read 7 bit ASCII chars.
+			int charIndex = 0;
+			int b = 0;
+			while (charIndex < charCount) {
+				b = input.ReadByte();
+				if (b > 127) break;
+				chars[charIndex++] = (char)b;
+			}
+			// If a char was not ASCII, finish with slow path.
+			if (charIndex < charCount) ReadUtf8_slow(input, charCount, charIndex, b);
+			return new String(chars, 0, charCount);
+		}
+
+		private void ReadUtf8_slow (Stream input, int charCount, int charIndex, int b) {
+			char[] chars = this.chars;
+			while (true) {
+				switch (b >> 4) {
+				case 0:
+				case 1:
+				case 2:
+				case 3:
+				case 4:
+				case 5:
+				case 6:
+				case 7:
+					chars[charIndex] = (char)b;
+					break;
+				case 12:
+				case 13:
+					chars[charIndex] = (char)((b & 0x1F) << 6 | input.ReadByte() & 0x3F);
+					break;
+				case 14:
+					chars[charIndex] = (char)((b & 0x0F) << 12 | (input.ReadByte() & 0x3F) << 6 | input.ReadByte() & 0x3F);
+					break;
+				}
+				if (++charIndex >= charCount) break;
+				b = input.ReadByte() & 0xFF;
+			}
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/SkeletonBounds.cs

@@ -0,0 +1,215 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	public class SkeletonBounds {
+		private List<Polygon> polygonPool = new List<Polygon>();
+		private float minX, minY, maxX, maxY;
+
+		public List<BoundingBoxAttachment> BoundingBoxes { get; private set; }
+		public List<Polygon> Polygons { get; private set; }
+		public float MinX { get { return minX; } set { minX = value; } }
+		public float MinY { get { return minY; } set { minY = value; } }
+		public float MaxX { get { return maxX; } set { maxX = value; } }
+		public float MaxY { get { return maxY; } set { maxY = value; } }
+		public float Width { get { return maxX - minX; } }
+		public float Height { get { return maxY - minY; } }
+
+		public SkeletonBounds () {
+			BoundingBoxes = new List<BoundingBoxAttachment>();
+			Polygons = new List<Polygon>();
+		}
+
+		public void Update (Skeleton skeleton, bool updateAabb) {
+			List<BoundingBoxAttachment> boundingBoxes = BoundingBoxes;
+			List<Polygon> polygons = Polygons;
+			List<Slot> slots = skeleton.slots;
+			int slotCount = slots.Count;
+
+			boundingBoxes.Clear();
+			foreach (Polygon polygon in polygons)
+				polygonPool.Add(polygon);
+			polygons.Clear();
+
+			for (int i = 0; i < slotCount; i++) {
+				Slot slot = slots[i];
+				BoundingBoxAttachment boundingBox = slot.attachment as BoundingBoxAttachment;
+				if (boundingBox == null) continue;
+				boundingBoxes.Add(boundingBox);
+
+				Polygon polygon = null;
+				int poolCount = polygonPool.Count;
+				if (poolCount > 0) {
+					polygon = polygonPool[poolCount - 1];
+					polygonPool.RemoveAt(poolCount - 1);
+				} else
+					polygon = new Polygon();
+				polygons.Add(polygon);
+
+				int count = boundingBox.Vertices.Length;
+				polygon.Count = count;
+				if (polygon.Vertices.Length < count) polygon.Vertices = new float[count];
+				boundingBox.ComputeWorldVertices(slot.bone, polygon.Vertices);
+			}
+
+			if (updateAabb) aabbCompute();
+		}
+
+		private void aabbCompute () {
+			float minX = int.MaxValue, minY = int.MaxValue, maxX = int.MinValue, maxY = int.MinValue;
+			List<Polygon> polygons = Polygons;
+			for (int i = 0, n = polygons.Count; i < n; i++) {
+				Polygon polygon = polygons[i];
+				float[] vertices = polygon.Vertices;
+				for (int ii = 0, nn = polygon.Count; ii < nn; ii += 2) {
+					float x = vertices[ii];
+					float y = vertices[ii + 1];
+					minX = Math.Min(minX, x);
+					minY = Math.Min(minY, y);
+					maxX = Math.Max(maxX, x);
+					maxY = Math.Max(maxY, y);
+				}
+			}
+			this.minX = minX;
+			this.minY = minY;
+			this.maxX = maxX;
+			this.maxY = maxY;
+		}
+
+
+		/// <summary>Returns true if the axis aligned bounding box contains the point.</summary>
+		public bool AabbContainsPoint (float x, float y) {
+			return x >= minX && x <= maxX && y >= minY && y <= maxY;
+		}
+
+		/// <summary>Returns true if the axis aligned bounding box intersects the line segment.</summary>
+		public bool AabbIntersectsSegment (float x1, float y1, float x2, float y2) {
+			float minX = this.minX;
+			float minY = this.minY;
+			float maxX = this.maxX;
+			float maxY = this.maxY;
+			if ((x1 <= minX && x2 <= minX) || (y1 <= minY && y2 <= minY) || (x1 >= maxX && x2 >= maxX) || (y1 >= maxY && y2 >= maxY))
+				return false;
+			float m = (y2 - y1) / (x2 - x1);
+			float y = m * (minX - x1) + y1;
+			if (y > minY && y < maxY) return true;
+			y = m * (maxX - x1) + y1;
+			if (y > minY && y < maxY) return true;
+			float x = (minY - y1) / m + x1;
+			if (x > minX && x < maxX) return true;
+			x = (maxY - y1) / m + x1;
+			if (x > minX && x < maxX) return true;
+			return false;
+		}
+
+		/// <summary>Returns true if the axis aligned bounding box intersects the axis aligned bounding box of the specified bounds.</summary>
+		public bool AabbIntersectsSkeleton (SkeletonBounds bounds) {
+			return minX < bounds.maxX && maxX > bounds.minX && minY < bounds.maxY && maxY > bounds.minY;
+		}
+
+		/// <summary>Returns true if the polygon contains the point.</summary>
+		public bool ContainsPoint (Polygon polygon, float x, float y) {
+			float[] vertices = polygon.Vertices;
+			int nn = polygon.Count;
+
+			int prevIndex = nn - 2;
+			bool inside = false;
+			for (int ii = 0; ii < nn; ii += 2) {
+				float vertexY = vertices[ii + 1];
+				float prevY = vertices[prevIndex + 1];
+				if ((vertexY < y && prevY >= y) || (prevY < y && vertexY >= y)) {
+					float vertexX = vertices[ii];
+					if (vertexX + (y - vertexY) / (prevY - vertexY) * (vertices[prevIndex] - vertexX) < x) inside = !inside;
+				}
+				prevIndex = ii;
+			}
+			return inside;
+		}
+
+		/// <summary>Returns the first bounding box attachment that contains the point, or null. When doing many checks, it is usually more
+		/// efficient to only call this method if {@link #aabbContainsPoint(float, float)} returns true.</summary>
+		public BoundingBoxAttachment ContainsPoint (float x, float y) {
+			List<Polygon> polygons = Polygons;
+			for (int i = 0, n = polygons.Count; i < n; i++)
+				if (ContainsPoint(polygons[i], x, y)) return BoundingBoxes[i];
+			return null;
+		}
+
+		/// <summary>Returns the first bounding box attachment that contains the line segment, or null. When doing many checks, it is usually
+		/// more efficient to only call this method if {@link #aabbIntersectsSegment(float, float, float, float)} returns true.</summary>
+		public BoundingBoxAttachment IntersectsSegment (float x1, float y1, float x2, float y2) {
+			List<Polygon> polygons = Polygons;
+			for (int i = 0, n = polygons.Count; i < n; i++)
+				if (IntersectsSegment(polygons[i], x1, y1, x2, y2)) return BoundingBoxes[i];
+			return null;
+		}
+
+		/// <summary>Returns true if the polygon contains the line segment.</summary>
+		public bool IntersectsSegment (Polygon polygon, float x1, float y1, float x2, float y2) {
+			float[] vertices = polygon.Vertices;
+			int nn = polygon.Count;
+
+			float width12 = x1 - x2, height12 = y1 - y2;
+			float det1 = x1 * y2 - y1 * x2;
+			float x3 = vertices[nn - 2], y3 = vertices[nn - 1];
+			for (int ii = 0; ii < nn; ii += 2) {
+				float x4 = vertices[ii], y4 = vertices[ii + 1];
+				float det2 = x3 * y4 - y3 * x4;
+				float width34 = x3 - x4, height34 = y3 - y4;
+				float det3 = width12 * height34 - height12 * width34;
+				float x = (det1 * width34 - width12 * det2) / det3;
+				if (((x >= x3 && x <= x4) || (x >= x4 && x <= x3)) && ((x >= x1 && x <= x2) || (x >= x2 && x <= x1))) {
+					float y = (det1 * height34 - height12 * det2) / det3;
+					if (((y >= y3 && y <= y4) || (y >= y4 && y <= y3)) && ((y >= y1 && y <= y2) || (y >= y2 && y <= y1))) return true;
+				}
+				x3 = x4;
+				y3 = y4;
+			}
+			return false;
+		}
+
+		public Polygon getPolygon (BoundingBoxAttachment attachment) {
+			int index = BoundingBoxes.IndexOf(attachment);
+			return index == -1 ? null : Polygons[index];
+		}
+	}
+
+	public class Polygon {
+		public float[] Vertices { get; set; }
+		public int Count { get; set; }
+
+		public Polygon () {
+			Vertices = new float[16];
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/SkeletonData.cs

@@ -0,0 +1,158 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	public class SkeletonData {
+		internal String name;
+		internal List<BoneData> bones = new List<BoneData>();
+		internal List<SlotData> slots = new List<SlotData>();
+		internal List<Skin> skins = new List<Skin>();
+		internal Skin defaultSkin;
+		internal List<EventData> events = new List<EventData>();
+		internal List<Animation> animations = new List<Animation>();
+		internal List<IkConstraintData> ikConstraints = new List<IkConstraintData>();
+		internal float width, height;
+		internal String version, hash, imagesPath;
+
+		public String Name { get { return name; } set { name = value; } }
+		public List<BoneData> Bones { get { return bones; } } // Ordered parents first.
+		public List<SlotData> Slots { get { return slots; } } // Setup pose draw order.
+		public List<Skin> Skins { get { return skins; } set { skins = value; } }
+		/// <summary>May be null.</summary>
+		public Skin DefaultSkin { get { return defaultSkin; } set { defaultSkin = value; } }
+		public List<EventData> Events { get { return events; } set { events = value; } }
+		public List<Animation> Animations { get { return animations; } set { animations = value; } }
+		public List<IkConstraintData> IkConstraints { get { return ikConstraints; } set { ikConstraints = value; } }
+		public float Width { get { return width; } set { width = value; } }
+		public float Height { get { return height; } set { height = value; } }
+		/// <summary>The Spine version used to export this data.</summary>
+		public String Version { get { return version; } set { version = value; } }
+		public String Hash { get { return hash; } set { hash = value; } }
+
+		// --- Bones.
+
+		/// <returns>May be null.</returns>
+		public BoneData FindBone (String boneName) {
+			if (boneName == null) throw new ArgumentNullException("boneName cannot be null.");
+			List<BoneData> bones = this.bones;
+			for (int i = 0, n = bones.Count; i < n; i++) {
+				BoneData bone = bones[i];
+				if (bone.name == boneName) return bone;
+			}
+			return null;
+		}
+
+		/// <returns>-1 if the bone was not found.</returns>
+		public int FindBoneIndex (String boneName) {
+			if (boneName == null) throw new ArgumentNullException("boneName cannot be null.");
+			List<BoneData> bones = this.bones;
+			for (int i = 0, n = bones.Count; i < n; i++)
+				if (bones[i].name == boneName) return i;
+			return -1;
+		}
+
+		// --- Slots.
+
+		/// <returns>May be null.</returns>
+		public SlotData FindSlot (String slotName) {
+			if (slotName == null) throw new ArgumentNullException("slotName cannot be null.");
+			List<SlotData> slots = this.slots;
+			for (int i = 0, n = slots.Count; i < n; i++) {
+				SlotData slot = slots[i];
+				if (slot.name == slotName) return slot;
+			}
+			return null;
+		}
+
+		/// <returns>-1 if the bone was not found.</returns>
+		public int FindSlotIndex (String slotName) {
+			if (slotName == null) throw new ArgumentNullException("slotName cannot be null.");
+			List<SlotData> slots = this.slots;
+			for (int i = 0, n = slots.Count; i < n; i++)
+				if (slots[i].name == slotName) return i;
+			return -1;
+		}
+
+		// --- Skins.
+		
+		/// <returns>May be null.</returns>
+		public Skin FindSkin (String skinName) {
+			if (skinName == null) throw new ArgumentNullException("skinName cannot be null.");
+			foreach (Skin skin in skins)
+				if (skin.name == skinName) return skin;
+			return null;
+		}
+
+		// --- Events.
+
+		/// <returns>May be null.</returns>
+		public EventData FindEvent (String eventDataName) {
+			if (eventDataName == null) throw new ArgumentNullException("eventDataName cannot be null.");
+			foreach (EventData eventData in events)
+				if (eventData.name == eventDataName) return eventData;
+			return null;
+		}
+
+		// --- Animations.
+		
+		/// <returns>May be null.</returns>
+		public Animation FindAnimation (String animationName) {
+			if (animationName == null) throw new ArgumentNullException("animationName cannot be null.");
+			List<Animation> animations = this.animations;
+			for (int i = 0, n = animations.Count; i < n; i++) {
+				Animation animation = animations[i];
+				if (animation.name == animationName) return animation;
+			}
+			return null;
+		}
+
+		// --- IK constraints.
+
+		/// <returns>May be null.</returns>
+		public IkConstraintData FindIkConstraint (String ikConstraintName) {
+			if (ikConstraintName == null) throw new ArgumentNullException("ikConstraintName cannot be null.");
+			List<IkConstraintData> ikConstraints = this.ikConstraints;
+			for (int i = 0, n = ikConstraints.Count; i < n; i++) {
+				IkConstraintData ikConstraint = ikConstraints[i];
+				if (ikConstraint.name == ikConstraintName) return ikConstraint;
+			}
+			return null;
+		}
+
+		// ---
+
+		override public String ToString () {
+			return name ?? base.ToString();
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/SkeletonJson.cs

@@ -0,0 +1,641 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.IO;
+using System.Collections.Generic;
+
+#if WINDOWS_STOREAPP
+using System.Threading.Tasks;
+using Windows.Storage;
+#endif
+
+namespace SpineRuntime21 {
+	public class SkeletonJson {
+		private AttachmentLoader attachmentLoader;
+		public float Scale { get; set; }
+
+		public SkeletonJson (params Atlas[] atlasArray)
+			: this(new AtlasAttachmentLoader(atlasArray)) {
+		}
+
+		public SkeletonJson (AttachmentLoader attachmentLoader) {
+			if (attachmentLoader == null) throw new ArgumentNullException("attachmentLoader cannot be null.");
+			this.attachmentLoader = attachmentLoader;
+			Scale = 1;
+		}
+
+#if WINDOWS_STOREAPP
+		private async Task<SkeletonData> ReadFile(string path) {
+			var folder = Windows.ApplicationModel.Package.Current.InstalledLocation;
+			var file = await folder.GetFileAsync(path).AsTask().ConfigureAwait(false);
+			using (var reader = new StreamReader(await file.OpenStreamForReadAsync().ConfigureAwait(false))) {
+				SkeletonData skeletonData = ReadSkeletonData(reader);
+				skeletonData.Name = Path.GetFileNameWithoutExtension(path);
+				return skeletonData;
+			}
+		}
+
+		public SkeletonData ReadSkeletonData (String path) {
+			return this.ReadFile(path).Result;
+		}
+#else
+		public SkeletonData ReadSkeletonData (String path) {
+#if WINDOWS_PHONE
+			Stream stream = Microsoft.Xna.Framework.TitleContainer.OpenStream(path);
+			using (StreamReader reader = new StreamReader(stream)) {
+#else
+			using (StreamReader reader = new StreamReader(path)) {
+#endif
+				SkeletonData skeletonData = ReadSkeletonData(reader);
+				skeletonData.name = Path.GetFileNameWithoutExtension(path);
+				return skeletonData;
+			}
+		}
+#endif
+
+		public SkeletonData ReadSkeletonData (TextReader reader) {
+			if (reader == null) throw new ArgumentNullException("reader cannot be null.");
+
+			var skeletonData = new SkeletonData();
+
+			var root = Json.Deserialize(reader) as Dictionary<String, Object>;
+			if (root == null) throw new Exception("Invalid JSON.");
+
+			// Skeleton.
+			if (root.ContainsKey("skeleton")) {
+				var skeletonMap = (Dictionary<String, Object>)root["skeleton"];
+				skeletonData.hash = (String)skeletonMap["hash"];
+				skeletonData.version = (String)skeletonMap["spine"];
+				skeletonData.width = GetFloat(skeletonMap, "width", 0);
+				skeletonData.height = GetFloat(skeletonMap, "height", 0);
+			}
+
+			// Bones.
+			foreach (Dictionary<String, Object> boneMap in (List<Object>)root["bones"]) {
+				BoneData parent = null;
+				if (boneMap.ContainsKey("parent")) {
+					parent = skeletonData.FindBone((String)boneMap["parent"]);
+					if (parent == null)
+						throw new Exception("Parent bone not found: " + boneMap["parent"]);
+				}
+				var boneData = new BoneData((String)boneMap["name"], parent);
+				boneData.length = GetFloat(boneMap, "length", 0) * Scale;
+				boneData.x = GetFloat(boneMap, "x", 0) * Scale;
+				boneData.y = GetFloat(boneMap, "y", 0) * Scale;
+				boneData.rotation = GetFloat(boneMap, "rotation", 0);
+				boneData.scaleX = GetFloat(boneMap, "scaleX", 1);
+				boneData.scaleY = GetFloat(boneMap, "scaleY", 1);
+				boneData.flipX = GetBoolean(boneMap, "flipX", false);
+				boneData.flipY = GetBoolean(boneMap, "flipY", false);
+				boneData.inheritScale = GetBoolean(boneMap, "inheritScale", true);
+				boneData.inheritRotation = GetBoolean(boneMap, "inheritRotation", true);
+				skeletonData.bones.Add(boneData);
+			}
+
+			// IK constraints.
+			if (root.ContainsKey("ik")) {
+				foreach (Dictionary<String, Object> ikMap in (List<Object>)root["ik"]) {
+					IkConstraintData ikConstraintData = new IkConstraintData((String)ikMap["name"]);
+
+					foreach (String boneName in (List<Object>)ikMap["bones"]) {
+						BoneData bone = skeletonData.FindBone(boneName);
+						if (bone == null) throw new Exception("IK bone not found: " + boneName);
+						ikConstraintData.bones.Add(bone);
+					}
+
+					String targetName = (String)ikMap["target"];
+					ikConstraintData.target = skeletonData.FindBone(targetName);
+					if (ikConstraintData.target == null) throw new Exception("Target bone not found: " + targetName);
+
+					ikConstraintData.bendDirection = GetBoolean(ikMap, "bendPositive", true) ? 1 : -1;
+					ikConstraintData.mix = GetFloat(ikMap, "mix", 1);
+
+					skeletonData.ikConstraints.Add(ikConstraintData);
+				}
+			}
+
+			// Slots.
+			if (root.ContainsKey("slots")) {
+				foreach (Dictionary<String, Object> slotMap in (List<Object>)root["slots"]) {
+					var slotName = (String)slotMap["name"];
+					var boneName = (String)slotMap["bone"];
+					BoneData boneData = skeletonData.FindBone(boneName);
+					if (boneData == null)
+						throw new Exception("Slot bone not found: " + boneName);
+					var slotData = new SlotData(slotName, boneData);
+
+					if (slotMap.ContainsKey("color")) {
+						var color = (String)slotMap["color"];
+						slotData.r = ToColor(color, 0);
+						slotData.g = ToColor(color, 1);
+						slotData.b = ToColor(color, 2);
+						slotData.a = ToColor(color, 3);
+					}
+
+					if (slotMap.ContainsKey("attachment"))
+						slotData.attachmentName = (String)slotMap["attachment"];
+
+					if (slotMap.ContainsKey("additive"))
+						slotData.additiveBlending = (bool)slotMap["additive"];
+
+					skeletonData.slots.Add(slotData);
+				}
+			}
+
+			// Skins.
+			if (root.ContainsKey("skins")) {
+				foreach (KeyValuePair<String, Object> entry in (Dictionary<String, Object>)root["skins"]) {
+					var skin = new Skin(entry.Key);
+					foreach (KeyValuePair<String, Object> slotEntry in (Dictionary<String, Object>)entry.Value) {
+						int slotIndex = skeletonData.FindSlotIndex(slotEntry.Key);
+						foreach (KeyValuePair<String, Object> attachmentEntry in ((Dictionary<String, Object>)slotEntry.Value)) {
+							Attachment attachment = ReadAttachment(skin, attachmentEntry.Key, (Dictionary<String, Object>)attachmentEntry.Value);
+							if (attachment != null) skin.AddAttachment(slotIndex, attachmentEntry.Key, attachment);
+						}
+					}
+					skeletonData.skins.Add(skin);
+					if (skin.name == "default")
+						skeletonData.defaultSkin = skin;
+				}
+			}
+
+			// Events.
+			if (root.ContainsKey("events")) {
+				foreach (KeyValuePair<String, Object> entry in (Dictionary<String, Object>)root["events"]) {
+					var entryMap = (Dictionary<String, Object>)entry.Value;
+					var eventData = new EventData(entry.Key);
+					eventData.Int = GetInt(entryMap, "int", 0);
+					eventData.Float = GetFloat(entryMap, "float", 0);
+					eventData.String = GetString(entryMap, "string", null);
+					skeletonData.events.Add(eventData);
+				}
+			}
+
+			// Animations.
+			if (root.ContainsKey("animations")) {
+				foreach (KeyValuePair<String, Object> entry in (Dictionary<String, Object>)root["animations"])
+					ReadAnimation(entry.Key, (Dictionary<String, Object>)entry.Value, skeletonData);
+			}
+
+			skeletonData.bones.TrimExcess();
+			skeletonData.slots.TrimExcess();
+			skeletonData.skins.TrimExcess();
+			skeletonData.events.TrimExcess();
+			skeletonData.animations.TrimExcess();
+			skeletonData.ikConstraints.TrimExcess();
+			return skeletonData;
+		}
+
+		private Attachment ReadAttachment (Skin skin, String name, Dictionary<String, Object> map) {
+			if (map.ContainsKey("name"))
+				name = (String)map["name"];
+
+			var type = AttachmentType.region;
+			if (map.ContainsKey("type"))
+				type = (AttachmentType)Enum.Parse(typeof(AttachmentType), (String)map["type"], false);
+
+			String path = name;
+			if (map.ContainsKey("path"))
+				path = (String)map["path"];
+
+			switch (type) {
+			case AttachmentType.region:
+				RegionAttachment region = attachmentLoader.NewRegionAttachment(skin, name, path);
+				if (region == null) return null;
+				region.Path = path;
+				region.x = GetFloat(map, "x", 0) * Scale;
+				region.y = GetFloat(map, "y", 0) * Scale;
+				region.scaleX = GetFloat(map, "scaleX", 1);
+				region.scaleY = GetFloat(map, "scaleY", 1);
+				region.rotation = GetFloat(map, "rotation", 0);
+				region.width = GetFloat(map, "width", 32) * Scale;
+				region.height = GetFloat(map, "height", 32) * Scale;
+				region.UpdateOffset();
+
+				if (map.ContainsKey("color")) {
+					var color = (String)map["color"];
+					region.r = ToColor(color, 0);
+					region.g = ToColor(color, 1);
+					region.b = ToColor(color, 2);
+					region.a = ToColor(color, 3);
+				}
+
+				return region;
+			case AttachmentType.mesh: {
+					MeshAttachment mesh = attachmentLoader.NewMeshAttachment(skin, name, path);
+					if (mesh == null) return null;
+
+					mesh.Path = path; 
+					mesh.vertices = GetFloatArray(map, "vertices", Scale);
+					mesh.triangles = GetIntArray(map, "triangles");
+					mesh.regionUVs = GetFloatArray(map, "uvs", 1);
+					mesh.UpdateUVs();
+
+					if (map.ContainsKey("color")) {
+						var color = (String)map["color"];
+						mesh.r = ToColor(color, 0);
+						mesh.g = ToColor(color, 1);
+						mesh.b = ToColor(color, 2);
+						mesh.a = ToColor(color, 3);
+					}
+
+					mesh.HullLength = GetInt(map, "hull", 0) * 2;
+					if (map.ContainsKey("edges")) mesh.Edges = GetIntArray(map, "edges");
+					mesh.Width = GetInt(map, "width", 0) * Scale;
+					mesh.Height = GetInt(map, "height", 0) * Scale;
+
+					return mesh;
+				}
+			case AttachmentType.skinnedmesh: {
+					SkinnedMeshAttachment mesh = attachmentLoader.NewSkinnedMeshAttachment(skin, name, path);
+					if (mesh == null) return null;
+
+					mesh.Path = path;
+					float[] uvs = GetFloatArray(map, "uvs", 1);
+					float[] vertices = GetFloatArray(map, "vertices", 1);
+					var weights = new List<float>(uvs.Length * 3 * 3);
+					var bones = new List<int>(uvs.Length * 3);
+					float scale = Scale;
+					for (int i = 0, n = vertices.Length; i < n; ) {
+						int boneCount = (int)vertices[i++];
+						bones.Add(boneCount);
+						for (int nn = i + boneCount * 4; i < nn; ) {
+							bones.Add((int)vertices[i]);
+							weights.Add(vertices[i + 1] * scale);
+							weights.Add(vertices[i + 2] * scale);
+							weights.Add(vertices[i + 3]);
+							i += 4;
+						}
+					}
+					mesh.bones = bones.ToArray();
+					mesh.weights = weights.ToArray();
+					mesh.triangles = GetIntArray(map, "triangles");
+					mesh.regionUVs = uvs;
+					mesh.UpdateUVs();
+
+					if (map.ContainsKey("color")) {
+						var color = (String)map["color"];
+						mesh.r = ToColor(color, 0);
+						mesh.g = ToColor(color, 1);
+						mesh.b = ToColor(color, 2);
+						mesh.a = ToColor(color, 3);
+					}
+
+					mesh.HullLength = GetInt(map, "hull", 0) * 2;
+					if (map.ContainsKey("edges")) mesh.Edges = GetIntArray(map, "edges");
+					mesh.Width = GetInt(map, "width", 0) * Scale;
+					mesh.Height = GetInt(map, "height", 0) * Scale;
+
+					return mesh;
+				}
+			case AttachmentType.boundingbox:
+				BoundingBoxAttachment box = attachmentLoader.NewBoundingBoxAttachment(skin, name);
+				if (box == null) return null;
+				box.vertices = GetFloatArray(map, "vertices", Scale);
+				return box;
+			}
+			return null;
+		}
+
+		private float[] GetFloatArray (Dictionary<String, Object> map, String name, float scale) {
+			var list = (List<Object>)map[name];
+			var values = new float[list.Count];
+			if (scale == 1) {
+				for (int i = 0, n = list.Count; i < n; i++)
+					values[i] = (float)list[i];
+			} else {
+				for (int i = 0, n = list.Count; i < n; i++)
+					values[i] = (float)list[i] * scale;
+			}
+			return values;
+		}
+
+		private int[] GetIntArray (Dictionary<String, Object> map, String name) {
+			var list = (List<Object>)map[name];
+			var values = new int[list.Count];
+			for (int i = 0, n = list.Count; i < n; i++)
+				values[i] = (int)(float)list[i];
+			return values;
+		}
+
+		private float GetFloat (Dictionary<String, Object> map, String name, float defaultValue) {
+			if (!map.ContainsKey(name))
+				return defaultValue;
+			return (float)map[name];
+		}
+
+		private int GetInt (Dictionary<String, Object> map, String name, int defaultValue) {
+			if (!map.ContainsKey(name))
+				return defaultValue;
+			return (int)(float)map[name];
+		}
+
+		private bool GetBoolean (Dictionary<String, Object> map, String name, bool defaultValue) {
+			if (!map.ContainsKey(name))
+				return defaultValue;
+			return (bool)map[name];
+		}
+
+		private String GetString (Dictionary<String, Object> map, String name, String defaultValue) {
+			if (!map.ContainsKey(name))
+				return defaultValue;
+			return (String)map[name];
+		}
+
+		private float ToColor (String hexString, int colorIndex) {
+			if (hexString.Length != 8)
+				throw new ArgumentException("Color hexidecimal length must be 8, recieved: " + hexString);
+			return Convert.ToInt32(hexString.Substring(colorIndex * 2, 2), 16) / (float)255;
+		}
+
+		private void ReadAnimation (String name, Dictionary<String, Object> map, SkeletonData skeletonData) {
+			var timelines = new List<Timeline>();
+			float duration = 0;
+			float scale = Scale;
+
+			if (map.ContainsKey("slots")) {
+				foreach (KeyValuePair<String, Object> entry in (Dictionary<String, Object>)map["slots"]) {
+					String slotName = entry.Key;
+					int slotIndex = skeletonData.FindSlotIndex(slotName);
+					var timelineMap = (Dictionary<String, Object>)entry.Value;
+
+					foreach (KeyValuePair<String, Object> timelineEntry in timelineMap) {
+						var values = (List<Object>)timelineEntry.Value;
+						var timelineName = (String)timelineEntry.Key;
+						if (timelineName == "color") {
+							var timeline = new ColorTimeline(values.Count);
+							timeline.slotIndex = slotIndex;
+
+							int frameIndex = 0;
+							foreach (Dictionary<String, Object> valueMap in values) {
+								float time = (float)valueMap["time"];
+								String c = (String)valueMap["color"];
+								timeline.SetFrame(frameIndex, time, ToColor(c, 0), ToColor(c, 1), ToColor(c, 2), ToColor(c, 3));
+								ReadCurve(timeline, frameIndex, valueMap);
+								frameIndex++;
+							}
+							timelines.Add(timeline);
+							duration = Math.Max(duration, timeline.frames[timeline.FrameCount * 5 - 5]);
+
+						} else if (timelineName == "attachment") {
+							var timeline = new AttachmentTimeline(values.Count);
+							timeline.slotIndex = slotIndex;
+
+							int frameIndex = 0;
+							foreach (Dictionary<String, Object> valueMap in values) {
+								float time = (float)valueMap["time"];
+								timeline.SetFrame(frameIndex++, time, (String)valueMap["name"]);
+							}
+							timelines.Add(timeline);
+							duration = Math.Max(duration, timeline.frames[timeline.FrameCount - 1]);
+
+						} else
+							throw new Exception("Invalid timeline type for a slot: " + timelineName + " (" + slotName + ")");
+					}
+				}
+			}
+
+			if (map.ContainsKey("bones")) {
+				foreach (KeyValuePair<String, Object> entry in (Dictionary<String, Object>)map["bones"]) {
+					String boneName = entry.Key;
+					int boneIndex = skeletonData.FindBoneIndex(boneName);
+					if (boneIndex == -1)
+						throw new Exception("Bone not found: " + boneName);
+
+					var timelineMap = (Dictionary<String, Object>)entry.Value;
+					foreach (KeyValuePair<String, Object> timelineEntry in timelineMap) {
+						var values = (List<Object>)timelineEntry.Value;
+						var timelineName = (String)timelineEntry.Key;
+						if (timelineName == "rotate") {
+							var timeline = new RotateTimeline(values.Count);
+							timeline.boneIndex = boneIndex;
+
+							int frameIndex = 0;
+							foreach (Dictionary<String, Object> valueMap in values) {
+								float time = (float)valueMap["time"];
+								timeline.SetFrame(frameIndex, time, (float)valueMap["angle"]);
+								ReadCurve(timeline, frameIndex, valueMap);
+								frameIndex++;
+							}
+							timelines.Add(timeline);
+							duration = Math.Max(duration, timeline.frames[timeline.FrameCount * 2 - 2]);
+
+						} else if (timelineName == "translate" || timelineName == "scale") {
+							TranslateTimeline timeline;
+							float timelineScale = 1;
+							if (timelineName == "scale")
+								timeline = new ScaleTimeline(values.Count);
+							else {
+								timeline = new TranslateTimeline(values.Count);
+								timelineScale = scale;
+							}
+							timeline.boneIndex = boneIndex;
+
+							int frameIndex = 0;
+							foreach (Dictionary<String, Object> valueMap in values) {
+								float time = (float)valueMap["time"];
+								float x = valueMap.ContainsKey("x") ? (float)valueMap["x"] : 0;
+								float y = valueMap.ContainsKey("y") ? (float)valueMap["y"] : 0;
+								timeline.SetFrame(frameIndex, time, (float)x * timelineScale, (float)y * timelineScale);
+								ReadCurve(timeline, frameIndex, valueMap);
+								frameIndex++;
+							}
+							timelines.Add(timeline);
+							duration = Math.Max(duration, timeline.frames[timeline.FrameCount * 3 - 3]);
+
+						} else if (timelineName == "flipX" || timelineName == "flipY") {
+							bool x = timelineName == "flipX";
+							var timeline = x ? new FlipXTimeline(values.Count) : new FlipYTimeline(values.Count);
+							timeline.boneIndex = boneIndex;
+
+							String field = x ? "x" : "y";
+							int frameIndex = 0;
+							foreach (Dictionary<String, Object> valueMap in values) {
+								float time = (float)valueMap["time"];
+								timeline.SetFrame(frameIndex, time, valueMap.ContainsKey(field) ? (bool)valueMap[field] : false);
+								frameIndex++;
+							}
+							timelines.Add(timeline);
+							duration = Math.Max(duration, timeline.frames[timeline.FrameCount * 2 - 2]);
+
+						} else
+							throw new Exception("Invalid timeline type for a bone: " + timelineName + " (" + boneName + ")");
+					}
+				}
+			}
+
+			if (map.ContainsKey("ik")) {
+				foreach (KeyValuePair<String, Object> ikMap in (Dictionary<String, Object>)map["ik"]) {
+					IkConstraintData ikConstraint = skeletonData.FindIkConstraint(ikMap.Key);
+					var values = (List<Object>)ikMap.Value;
+					var timeline = new IkConstraintTimeline(values.Count);
+					timeline.ikConstraintIndex = skeletonData.ikConstraints.IndexOf(ikConstraint);
+					int frameIndex = 0;
+					foreach (Dictionary<String, Object> valueMap in values) {
+						float time = (float)valueMap["time"];
+						float mix = valueMap.ContainsKey("mix") ? (float)valueMap["mix"] : 1;
+						bool bendPositive = valueMap.ContainsKey("bendPositive") ? (bool)valueMap["bendPositive"] : true;
+						timeline.SetFrame(frameIndex, time, mix, bendPositive ? 1 : -1);
+						ReadCurve(timeline, frameIndex, valueMap);
+						frameIndex++;
+					}
+					timelines.Add(timeline);
+					duration = Math.Max(duration, timeline.frames[timeline.FrameCount * 3 - 3]);
+				}
+			}
+
+			if (map.ContainsKey("ffd")) {
+				foreach (KeyValuePair<String, Object> ffdMap in (Dictionary<String, Object>)map["ffd"]) {
+					Skin skin = skeletonData.FindSkin(ffdMap.Key);
+					foreach (KeyValuePair<String, Object> slotMap in (Dictionary<String, Object>)ffdMap.Value) {
+						int slotIndex = skeletonData.FindSlotIndex(slotMap.Key);
+						foreach (KeyValuePair<String, Object> meshMap in (Dictionary<String, Object>)slotMap.Value) {
+							var values = (List<Object>)meshMap.Value;
+							var timeline = new FFDTimeline(values.Count);
+							Attachment attachment = skin.GetAttachment(slotIndex, meshMap.Key);
+							if (attachment == null) throw new Exception("FFD attachment not found: " + meshMap.Key);
+							timeline.slotIndex = slotIndex;
+							timeline.attachment = attachment;
+
+							int vertexCount;
+							if (attachment is MeshAttachment)
+								vertexCount = ((MeshAttachment)attachment).vertices.Length;
+							else
+								vertexCount = ((SkinnedMeshAttachment)attachment).Weights.Length / 3 * 2;
+
+							int frameIndex = 0;
+							foreach (Dictionary<String, Object> valueMap in values) {
+								float[] vertices;
+								if (!valueMap.ContainsKey("vertices")) {
+									if (attachment is MeshAttachment)
+										vertices = ((MeshAttachment)attachment).vertices;
+									else
+										vertices = new float[vertexCount];
+								} else {
+									var verticesValue = (List<Object>)valueMap["vertices"];
+									vertices = new float[vertexCount];
+									int start = GetInt(valueMap, "offset", 0);
+									if (scale == 1) {
+										for (int i = 0, n = verticesValue.Count; i < n; i++)
+											vertices[i + start] = (float)verticesValue[i];
+									} else {
+										for (int i = 0, n = verticesValue.Count; i < n; i++)
+											vertices[i + start] = (float)verticesValue[i] * scale;
+									}
+									if (attachment is MeshAttachment) {
+										float[] meshVertices = ((MeshAttachment)attachment).vertices;
+										for (int i = 0; i < vertexCount; i++)
+											vertices[i] += meshVertices[i];
+									}
+								}
+
+								timeline.SetFrame(frameIndex, (float)valueMap["time"], vertices);
+								ReadCurve(timeline, frameIndex, valueMap);
+								frameIndex++;
+							}
+							timelines.Add(timeline);
+							duration = Math.Max(duration, timeline.frames[timeline.FrameCount - 1]);
+						}
+					}
+				}
+			}
+
+			if (map.ContainsKey("drawOrder") || map.ContainsKey("draworder")) {
+				var values = (List<Object>)map[map.ContainsKey("drawOrder") ? "drawOrder" : "draworder"];
+				var timeline = new DrawOrderTimeline(values.Count);
+				int slotCount = skeletonData.slots.Count;
+				int frameIndex = 0;
+				foreach (Dictionary<String, Object> drawOrderMap in values) {
+					int[] drawOrder = null;
+					if (drawOrderMap.ContainsKey("offsets")) {
+						drawOrder = new int[slotCount];
+						for (int i = slotCount - 1; i >= 0; i--)
+							drawOrder[i] = -1;
+						var offsets = (List<Object>)drawOrderMap["offsets"];
+						int[] unchanged = new int[slotCount - offsets.Count];
+						int originalIndex = 0, unchangedIndex = 0;
+						foreach (Dictionary<String, Object> offsetMap in offsets) {
+							int slotIndex = skeletonData.FindSlotIndex((String)offsetMap["slot"]);
+							if (slotIndex == -1) throw new Exception("Slot not found: " + offsetMap["slot"]);
+							// Collect unchanged items.
+							while (originalIndex != slotIndex)
+								unchanged[unchangedIndex++] = originalIndex++;
+							// Set changed items.
+							int index = originalIndex + (int)(float)offsetMap["offset"];
+							drawOrder[index] = originalIndex++;
+						}
+						// Collect remaining unchanged items.
+						while (originalIndex < slotCount)
+							unchanged[unchangedIndex++] = originalIndex++;
+						// Fill in unchanged items.
+						for (int i = slotCount - 1; i >= 0; i--)
+							if (drawOrder[i] == -1) drawOrder[i] = unchanged[--unchangedIndex];
+					}
+					timeline.SetFrame(frameIndex++, (float)drawOrderMap["time"], drawOrder);
+				}
+				timelines.Add(timeline);
+				duration = Math.Max(duration, timeline.frames[timeline.FrameCount - 1]);
+			}
+
+			if (map.ContainsKey("events")) {
+				var eventsMap = (List<Object>)map["events"];
+				var timeline = new EventTimeline(eventsMap.Count);
+				int frameIndex = 0;
+				foreach (Dictionary<String, Object> eventMap in eventsMap) {
+					EventData eventData = skeletonData.FindEvent((String)eventMap["name"]);
+					if (eventData == null) throw new Exception("Event not found: " + eventMap["name"]);
+					var e = new Event(eventData);
+					e.Int = GetInt(eventMap, "int", eventData.Int);
+					e.Float = GetFloat(eventMap, "float", eventData.Float);
+					e.String = GetString(eventMap, "string", eventData.String);
+					timeline.SetFrame(frameIndex++, (float)eventMap["time"], e);
+				}
+				timelines.Add(timeline);
+				duration = Math.Max(duration, timeline.frames[timeline.FrameCount - 1]);
+			}
+
+			timelines.TrimExcess();
+			skeletonData.animations.Add(new Animation(name, timelines, duration));
+		}
+
+		private void ReadCurve (CurveTimeline timeline, int frameIndex, Dictionary<String, Object> valueMap) {
+			if (!valueMap.ContainsKey("curve"))
+				return;
+			Object curveObject = valueMap["curve"];
+			if (curveObject.Equals("stepped"))
+				timeline.SetStepped(frameIndex);
+			else if (curveObject is List<Object>) {
+				var curve = (List<Object>)curveObject;
+				timeline.SetCurve(frameIndex, (float)curve[0], (float)curve[1], (float)curve[2], (float)curve[3]);
+			}
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Skin.cs

@@ -0,0 +1,101 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+using System.Collections.Generic;
+
+namespace SpineRuntime21 {
+	/// <summary>Stores attachments by slot index and attachment name.</summary>
+	public class Skin {
+		internal String name;
+		private Dictionary<KeyValuePair<int, String>, Attachment> attachments =
+			new Dictionary<KeyValuePair<int, String>, Attachment>(AttachmentComparer.Instance);
+
+		public String Name { get { return name; } }
+
+		public Skin (String name) {
+			if (name == null) throw new ArgumentNullException("name cannot be null.");
+			this.name = name;
+		}
+
+		public void AddAttachment (int slotIndex, String name, Attachment attachment) {
+			if (attachment == null) throw new ArgumentNullException("attachment cannot be null.");
+			attachments[new KeyValuePair<int, String>(slotIndex, name)] = attachment;
+		}
+
+		/// <returns>May be null.</returns>
+		public Attachment GetAttachment (int slotIndex, String name) {
+			Attachment attachment;
+			attachments.TryGetValue(new KeyValuePair<int, String>(slotIndex, name), out attachment);
+			return attachment;
+		}
+
+		public void FindNamesForSlot (int slotIndex, List<String> names) {
+			if (names == null) throw new ArgumentNullException("names cannot be null.");
+			foreach (KeyValuePair<int, String> key in attachments.Keys)
+				if (key.Key == slotIndex) names.Add(key.Value);
+		}
+
+		public void FindAttachmentsForSlot (int slotIndex, List<Attachment> attachments) {
+			if (attachments == null) throw new ArgumentNullException("attachments cannot be null.");
+			foreach (KeyValuePair<KeyValuePair<int, String>, Attachment> entry in this.attachments)
+				if (entry.Key.Key == slotIndex) attachments.Add(entry.Value);
+		}
+
+		override public String ToString () {
+			return name;
+		}
+
+		/// <summary>Attach all attachments from this skin if the corresponding attachment from the old skin is currently attached.</summary>
+		internal void AttachAll (Skeleton skeleton, Skin oldSkin) {
+			foreach (KeyValuePair<KeyValuePair<int, String>, Attachment> entry in oldSkin.attachments) {
+				int slotIndex = entry.Key.Key;
+				Slot slot = skeleton.slots[slotIndex];
+				if (slot.attachment == entry.Value) {
+					Attachment attachment = GetAttachment(slotIndex, entry.Key.Value);
+					if (attachment != null) slot.Attachment = attachment;
+				}
+			}
+		}
+
+		// Avoids boxing in the dictionary.
+		private class AttachmentComparer : IEqualityComparer<KeyValuePair<int, String>> {
+			internal static readonly AttachmentComparer Instance = new AttachmentComparer();
+
+			bool IEqualityComparer<KeyValuePair<int, string>>.Equals (KeyValuePair<int, string> o1, KeyValuePair<int, string> o2) {
+				return o1.Key == o2.Key && o1.Value == o2.Value;
+			}
+
+			int IEqualityComparer<KeyValuePair<int, string>>.GetHashCode (KeyValuePair<int, string> o) {
+				return o.Key;
+			}
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/Slot.cs

@@ -0,0 +1,99 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	public class Slot {
+		internal SlotData data;
+		internal Bone bone;
+		internal float r, g, b, a;
+		internal Attachment attachment;
+		internal float attachmentTime;
+		internal float[] attachmentVertices = new float[0];
+		internal int attachmentVerticesCount;
+
+		public SlotData Data { get { return data; } }
+		public Bone Bone { get { return bone; } }
+		public Skeleton Skeleton { get { return bone.skeleton; } }
+		public float R { get { return r; } set { r = value; } }
+		public float G { get { return g; } set { g = value; } }
+		public float B { get { return b; } set { b = value; } }
+		public float A { get { return a; } set { a = value; } }
+
+		/// <summary>May be null.</summary>
+		public Attachment Attachment {
+			get {
+				return attachment;
+			}
+			set {
+				attachment = value;
+				attachmentTime = bone.skeleton.time;
+				attachmentVerticesCount = 0;
+			}
+		}
+
+		public float AttachmentTime {
+			get {
+				return bone.skeleton.time - attachmentTime;
+			}
+			set {
+				attachmentTime = bone.skeleton.time - value;
+			}
+		}
+
+		public float[] AttachmentVertices { get { return attachmentVertices; } set { attachmentVertices = value; } }
+		public int AttachmentVerticesCount { get { return attachmentVerticesCount; } set { attachmentVerticesCount = value; } }
+
+		public Slot (SlotData data, Bone bone) {
+			if (data == null) throw new ArgumentNullException("data cannot be null.");
+			if (bone == null) throw new ArgumentNullException("bone cannot be null.");
+			this.data = data;
+			this.bone = bone;
+			SetToSetupPose();
+		}
+
+		internal void SetToSetupPose (int slotIndex) {
+			r = data.r;
+			g = data.g;
+			b = data.b;
+			a = data.a;
+			Attachment = data.attachmentName == null ? null : bone.skeleton.GetAttachment(slotIndex, data.attachmentName);
+		}
+
+		public void SetToSetupPose () {
+			SetToSetupPose(bone.skeleton.data.slots.IndexOf(data));
+		}
+
+		override public String ToString () {
+			return data.name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/SlotData.cs

@@ -0,0 +1,62 @@
+/******************************************************************************
+ * Spine Runtimes Software License
+ * Version 2.1
+ * 
+ * Copyright (c) 2013, Esoteric Software
+ * All rights reserved.
+ * 
+ * You are granted a perpetual, non-exclusive, non-sublicensable and
+ * non-transferable license to install, execute and perform the Spine Runtimes
+ * Software (the "Software") solely for internal use. Without the written
+ * permission of Esoteric Software (typically granted by licensing Spine), you
+ * may not (a) modify, translate, adapt or otherwise create derivative works,
+ * improvements of the Software or develop new applications using the Software
+ * or (b) remove, delete, alter or obscure any trademarks or any copyright,
+ * trademark, patent or other intellectual property or proprietary rights
+ * notices on or in the Software, including any copy thereof. Redistributions
+ * in binary or source form must include this license and terms.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *****************************************************************************/
+
+using System;
+
+namespace SpineRuntime21 {
+	public class SlotData {
+		internal String name;
+		internal BoneData boneData;
+		internal float r = 1, g = 1, b = 1, a = 1;
+		internal String attachmentName;
+		internal bool additiveBlending;
+
+		public String Name { get { return name; } }
+		public BoneData BoneData { get { return boneData; } }
+		public float R { get { return r; } set { r = value; } }
+		public float G { get { return g; } set { g = value; } }
+		public float B { get { return b; } set { b = value; } }
+		public float A { get { return a; } set { a = value; } }
+		/// <summary>May be null.</summary>
+		public String AttachmentName { get { return attachmentName; } set { attachmentName = value; } }
+		public bool AdditiveBlending { get { return additiveBlending; } set { additiveBlending = value; } }
+
+		public SlotData (String name, BoneData boneData) {
+			if (name == null) throw new ArgumentNullException("name cannot be null.");
+			if (boneData == null) throw new ArgumentNullException("boneData cannot be null.");
+			this.name = name;
+			this.boneData = boneData;
+		}
+
+		override public String ToString () {
+			return name;
+		}
+	}
+}

SpineRuntimes/SpineRuntime21/SpineRuntime21.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <Platforms>x64</Platforms>
+        <TargetFramework>net8.0-windows</TargetFramework>
+        <RuntimeIdentifier>win-x64</RuntimeIdentifier>
+        <BaseOutputPath>$(SolutionDir)out</BaseOutputPath>
+        <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
+        <Version>2.1.25</Version>
+    </PropertyGroup>
+
+</Project>

SpineViewer.sln

@@ -15,6 +15,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution
 	ProjectSection(SolutionItems) = preProject
 		.editorconfig = .editorconfig
 		.gitignore = .gitignore
+		README.en.md = README.en.md
 		README.md = README.md
 	EndProjectSection
 EndProject
@@ -26,6 +27,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SpineRuntime41", "SpineRunt
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SpineRuntime42", "SpineRuntimes\SpineRuntime42\SpineRuntime42.csproj", "{1D96AAF6-AB7B-8050-4C7E-03431778628F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SpineRuntime21", "SpineRuntimes\SpineRuntime21\SpineRuntime21.csproj", "{628CA98E-1D21-2282-C01E-0470CAF211E1}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -60,6 +63,10 @@ Global
 		{1D96AAF6-AB7B-8050-4C7E-03431778628F}.Debug|x64.Build.0 = Debug|x64
 		{1D96AAF6-AB7B-8050-4C7E-03431778628F}.Release|x64.ActiveCfg = Release|x64
 		{1D96AAF6-AB7B-8050-4C7E-03431778628F}.Release|x64.Build.0 = Release|x64
+		{628CA98E-1D21-2282-C01E-0470CAF211E1}.Debug|x64.ActiveCfg = Debug|x64
+		{628CA98E-1D21-2282-C01E-0470CAF211E1}.Debug|x64.Build.0 = Debug|x64
+		{628CA98E-1D21-2282-C01E-0470CAF211E1}.Release|x64.ActiveCfg = Release|x64
+		{628CA98E-1D21-2282-C01E-0470CAF211E1}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -71,6 +78,7 @@ Global
 		{2E19353C-9C0B-85F7-4EF4-98A778A79059} = {EA2E1399-02BC-43BC-AD9F-42E23E9C3DA8}
 		{C7B93D57-A896-38B2-1D43-25B28502F756} = {EA2E1399-02BC-43BC-AD9F-42E23E9C3DA8}
 		{1D96AAF6-AB7B-8050-4C7E-03431778628F} = {EA2E1399-02BC-43BC-AD9F-42E23E9C3DA8}
+		{628CA98E-1D21-2282-C01E-0470CAF211E1} = {EA2E1399-02BC-43BC-AD9F-42E23E9C3DA8}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {91F0EFD1-4B07-4C3C-82D8-90432349D3A5}

SpineViewer/Spine/Implementations/Spine21.cs

@@ -0,0 +1,374 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SpineRuntime21;
+
+namespace SpineViewer.Spine.Implementations
+{
+    [SpineImplementation(Version.V21)]
+    internal class Spine21 : Spine
+    {
+        private class TextureLoader : SpineRuntime21.TextureLoader
+        {
+            public void Load(AtlasPage page, string path)
+            {
+                var texture = new SFML.Graphics.Texture(path);
+                if (page.magFilter == TextureFilter.Linear)
+                    texture.Smooth = true;
+                if (page.uWrap == TextureWrap.Repeat && page.vWrap == TextureWrap.Repeat)
+                    texture.Repeated = true;
+
+                page.rendererObject = texture;
+                page.width = (int)texture.Size.X;
+                page.height = (int)texture.Size.Y;
+            }
+
+            public void Unload(object texture)
+            {
+                ((SFML.Graphics.Texture)texture).Dispose();
+            }
+        }
+        private static TextureLoader textureLoader = new();
+
+        private Atlas atlas;
+        private SkeletonBinary? skeletonBinary;
+        private SkeletonJson? skeletonJson;
+        private SkeletonData skeletonData;
+        private AnimationStateData animationStateData;
+
+        private Skeleton skeleton;
+        private AnimationState animationState;
+
+        // 2.1.x 不支持剪裁
+        //private SkeletonClipping clipping = new(); 
+
+        public Spine21(string skelPath, string? atlasPath = null) : base(skelPath, atlasPath)
+        {
+            atlas = new Atlas(AtlasPath, textureLoader);
+            try
+            {
+                // 先尝试二进制文件
+                skeletonJson = null;
+                skeletonBinary = new SkeletonBinary(atlas);
+                skeletonData = skeletonBinary.ReadSkeletonData(SkelPath);
+            }
+            catch
+            {
+                try
+                {
+                    // 再尝试 Json 文件
+                    skeletonBinary = null;
+                    skeletonJson = new SkeletonJson(atlas);
+                    skeletonData = skeletonJson.ReadSkeletonData(SkelPath);
+                }
+                catch
+                {
+                    // 都不行就报错
+                    throw new ArgumentException($"Unknown skeleton file format {SkelPath}");
+                }
+            }
+
+            animationStateData = new AnimationStateData(skeletonData);
+            skeleton = new Skeleton(skeletonData);
+            animationState = new AnimationState(animationStateData);
+
+            foreach (var anime in skeletonData.Animations)
+                animationNames.Add(anime.Name);
+            CurrentAnimation = DefaultAnimationName;
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+            atlas.Dispose();
+        }
+
+        public override float Scale
+        {
+            get
+            {
+                if (skeletonBinary is not null)
+                    return skeletonBinary.Scale;
+                else if (skeletonJson is not null)
+                    return skeletonJson.Scale;
+                else
+                    return 1f;
+            }
+            set
+            {
+                // 保存状态
+                var position = Position;
+                var flipX = FlipX;
+                var flipY = FlipY;
+                var savedTrack0 = animationState.GetCurrent(0);
+
+                var val = Math.Max(value, SCALE_MIN);
+                if (skeletonBinary is not null)
+                {
+                    skeletonBinary.Scale = val;
+                    skeletonData = skeletonBinary.ReadSkeletonData(SkelPath);
+                }
+                else if (skeletonJson is not null)
+                {
+                    skeletonJson.Scale = val;
+                    skeletonData = skeletonJson.ReadSkeletonData(SkelPath);
+                }
+
+                // reload skel-dependent data
+                animationStateData = new AnimationStateData(skeletonData) { DefaultMix = animationStateData.DefaultMix };
+                skeleton = new Skeleton(skeletonData);
+                animationState = new AnimationState(animationStateData);
+
+                // 恢复状态
+                Position = position;
+                FlipX = flipX;
+                FlipY = flipY;
+
+                // 恢复原本 Track0 上所有动画
+                if (savedTrack0 is not null)
+                {
+                    var entry = animationState.SetAnimation(0, savedTrack0.Animation.Name, true);
+                    entry.Time = savedTrack0.Time;
+                    // 2.1.x 没有提供 Next 访问器，故放弃还原后续动画，问题不大，因为预览画面目前不需要连续播放不同动画，只需要循环同一个动画
+                    //var savedEntry = savedTrack0.Next;
+                    //while (savedEntry is not null)
+                    //{
+                    //    entry = animationState.AddAnimation(0, savedEntry.Animation.Name, true, 0);
+                    //    entry.Time = savedEntry.TrackTime;
+                    //    savedEntry = savedEntry.Next;
+                    //}
+                }
+            }
+        }
+
+        public override PointF Position 
+        { 
+            get => new(skeleton.X, skeleton.Y); 
+            set 
+            { 
+                skeleton.X = value.X; 
+                skeleton.Y = value.Y; 
+            } 
+        }
+
+        public override bool FlipX
+        {
+            get => skeleton.FlipX;
+            set => skeleton.FlipX = value;
+        }
+
+        public override bool FlipY
+        {
+            get => skeleton.FlipY;
+            set => skeleton.FlipY = value;
+        }
+
+        public override string CurrentAnimation
+        {
+            get => animationState.GetCurrent(0)?.Animation.Name ?? DefaultAnimationName;
+            set { if (animationNames.Contains(value)) { animationState.SetAnimation(0, value, true); Update(0); } }
+        }
+
+        public override RectangleF Bounds
+        {
+            get
+            {
+                float[] temp = new float[8];
+                var drawOrderItems = skeleton.DrawOrder;
+                float minX = int.MaxValue, minY = int.MaxValue, maxX = int.MinValue, maxY = int.MinValue;
+                for (int i = 0, n = skeleton.DrawOrder.Count; i < n; i++)
+                {
+                    Slot slot = drawOrderItems[i];
+                    int verticesLength = 0;
+                    float[] vertices = null;
+                    Attachment attachment = slot.Attachment;
+                    var regionAttachment = attachment as RegionAttachment;
+                    if (regionAttachment != null)
+                    {
+                        verticesLength = 8;
+                        vertices = temp;
+                        if (vertices.Length < 8) vertices = temp = new float[8];
+                        regionAttachment.ComputeWorldVertices(slot.Bone, temp);
+                    }
+                    else
+                    {
+                        var meshAttachment = attachment as MeshAttachment;
+                        if (meshAttachment != null)
+                        {
+                            MeshAttachment mesh = meshAttachment;
+                            verticesLength = mesh.Vertices.Length;
+                            vertices = temp;
+                            if (vertices.Length < verticesLength) vertices = temp = new float[verticesLength];
+                            mesh.ComputeWorldVertices(slot, temp);
+                        }
+                    }
+
+                    if (vertices != null)
+                    {
+                        for (int ii = 0; ii < verticesLength; ii += 2)
+                        {
+                            float vx = vertices[ii], vy = vertices[ii + 1];
+                            minX = Math.Min(minX, vx);
+                            minY = Math.Min(minY, vy);
+                            maxX = Math.Max(maxX, vx);
+                            maxY = Math.Max(maxY, vy);
+                        }
+                    }
+                }
+                return new RectangleF(minX, minY, maxX - minX, maxY - minY);
+            }
+        }
+
+        public override float GetAnimationDuration(string name) { return skeletonData.FindAnimation(name)?.Duration ?? 0f; }
+
+        public override void Update(float delta)
+        {
+            skeleton.Update(delta);
+            animationState.Update(delta);
+            animationState.Apply(skeleton);
+            skeleton.UpdateWorldTransform();
+        }
+
+        //private SFML.Graphics.BlendMode GetSFMLBlendMode(SpineRuntime21.BlendMode spineBlendMode)
+        //{
+        //    return spineBlendMode switch
+        //    {
+        //        SpineRuntime21.BlendMode.Normal => BlendMode.Normal,
+        //        SpineRuntime21.BlendMode.Additive => BlendMode.Additive,
+        //        SpineRuntime21.BlendMode.Multiply => BlendMode.Multiply,
+        //        SpineRuntime21.BlendMode.Screen => BlendMode.Screen,
+        //        _ => throw new NotImplementedException($"{spineBlendMode}"),
+        //    };
+        //}
+
+        public override void Draw(SFML.Graphics.RenderTarget target, SFML.Graphics.RenderStates states)
+        {
+            vertexArray.Clear();
+            states.Texture = null;
+
+            // 要用 DrawOrder 而不是 Slots
+            foreach (var slot in skeleton.DrawOrder)
+            {
+                var attachment = slot.Attachment;
+
+                SFML.Graphics.Texture texture;
+
+                float[] worldVertices = worldVerticesBuffer;    // 顶点世界坐标, 连续的 [x0, y0, x1, y1, ...] 坐标值
+                int worldVerticesCount;                         // 等于顶点数组的长度除以 2
+                int[] worldTriangleIndices;                     // 三角形索引, 从顶点坐标数组取的时候要乘以 2, 最大值是 worldVerticesCount - 1
+                int worldTriangleIndicesLength;                 // 三角形索引数组长度
+                float[] uvs;                                    // 纹理坐标
+                float tintR = skeleton.R * slot.R;
+                float tintG = skeleton.G * slot.G;
+                float tintB = skeleton.B * slot.B;
+                float tintA = skeleton.A * slot.A;
+
+                if (attachment is RegionAttachment regionAttachment)
+                {
+                    texture = (SFML.Graphics.Texture)((AtlasRegion)regionAttachment.RendererObject).page.rendererObject;
+
+                    regionAttachment.ComputeWorldVertices(slot.Bone, worldVertices);
+                    worldVerticesCount = 4;
+                    worldTriangleIndices = [0, 1, 2, 2, 3, 0];
+                    worldTriangleIndicesLength = 6;
+                    uvs = regionAttachment.UVs;
+                    tintR *= regionAttachment.R;
+                    tintG *= regionAttachment.G;
+                    tintB *= regionAttachment.B;
+                    tintA *= regionAttachment.A;
+                }
+                else if (attachment is MeshAttachment meshAttachment)
+                {
+                    texture = (SFML.Graphics.Texture)((AtlasRegion)meshAttachment.RendererObject).page.rendererObject;
+
+                    if (meshAttachment.Vertices.Length > worldVertices.Length)
+                        worldVertices = worldVerticesBuffer = new float[meshAttachment.Vertices.Length * 2];
+                    meshAttachment.ComputeWorldVertices(slot, worldVertices);
+                    worldVerticesCount = meshAttachment.Vertices.Length / 2;
+                    worldTriangleIndices = meshAttachment.Triangles;
+                    worldTriangleIndicesLength = meshAttachment.Triangles.Length;
+                    uvs = meshAttachment.UVs;
+                    tintR *= meshAttachment.R;
+                    tintG *= meshAttachment.G;
+                    tintB *= meshAttachment.B;
+                    tintA *= meshAttachment.A;
+                }
+                // 2.1.x 不支持剪裁
+                //else if (attachment is ClippingAttachment clippingAttachment)
+                //{
+                //    clipping.ClipStart(slot, clippingAttachment);
+                //    continue;
+                //}
+                else
+                {
+                    //clipping.ClipEnd(slot);
+                    continue;
+                }
+
+                // 似乎 2.1.x 也没有 BlendMode
+                SFML.Graphics.BlendMode blendMode = slot.Data.AdditiveBlending ? BlendMode.Additive : BlendMode.Normal;
+
+                states.Texture ??= texture;
+                if (states.BlendMode != blendMode || states.Texture != texture)
+                {
+                    if (vertexArray.VertexCount > 0)
+                    {
+                        if (UsePremultipliedAlpha && (states.BlendMode == BlendMode.Normal || states.BlendMode == BlendMode.Additive))
+                            states.Shader = FragmentShader;
+                        else
+                            states.Shader = null;
+                        target.Draw(vertexArray, states);
+                        vertexArray.Clear();
+                    }
+                    states.BlendMode = blendMode;
+                    states.Texture = texture;
+                }
+
+                //if (clipping.IsClipping)
+                //{
+                //    // 这里必须单独记录 Count, 和 Items 的 Length 是不一致的
+                //    clipping.ClipTriangles(worldVertices, worldVerticesCount * 2, worldTriangleIndices, worldTriangleIndicesLength, uvs);
+                //    worldVertices = clipping.ClippedVertices.Items;
+                //    worldVerticesCount = clipping.ClippedVertices.Count / 2;
+                //    worldTriangleIndices = clipping.ClippedTriangles.Items;
+                //    worldTriangleIndicesLength = clipping.ClippedTriangles.Count;
+                //    uvs = clipping.ClippedUVs.Items;
+                //}
+
+                var textureSizeX = texture.Size.X;
+                var textureSizeY = texture.Size.Y;
+
+                SFML.Graphics.Vertex vertex = new();
+                vertex.Color.R = (byte)(tintR * 255);
+                vertex.Color.G = (byte)(tintG * 255);
+                vertex.Color.B = (byte)(tintB * 255);
+                vertex.Color.A = (byte)(tintA * 255);
+
+                // 必须用 worldTriangleIndicesLength 不能直接 foreach
+                for (int i = 0; i < worldTriangleIndicesLength; i++)
+                {
+                    var index = worldTriangleIndices[i] * 2;
+                    vertex.Position.X = worldVertices[index];
+                    vertex.Position.Y = worldVertices[index + 1];
+                    vertex.TexCoords.X = uvs[index] * textureSizeX;
+                    vertex.TexCoords.Y = uvs[index + 1] * textureSizeY;
+                    vertexArray.Append(vertex);
+                }
+
+                //clipping.ClipEnd(slot);
+            }
+
+            if (UsePremultipliedAlpha && (states.BlendMode == BlendMode.Normal || states.BlendMode == BlendMode.Additive))
+                states.Shader = FragmentShader;
+            else
+                states.Shader = null;
+            target.Draw(vertexArray, states);
+            //clipping.ClipEnd();
+        }
+    }
+}

SpineViewer/Spine/Version.cs

@@ -40,6 +40,7 @@ namespace SpineViewer.Spine
     /// </summary>
     public enum Version
     {
+        [Description("v2.1.x")] V21 = 0x0201,
         [Description("v3.6.x")] V36 = 0x0306,
         [Description("v3.7.x")] V37 = 0x0307,
         [Description("v3.8.x")] V38 = 0x0308,

SpineViewer/SpineViewer.csproj

@@ -8,7 +8,7 @@
         <RuntimeIdentifier>win-x64</RuntimeIdentifier>
         <BaseOutputPath>$(SolutionDir)out</BaseOutputPath>
         <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
-        <Version>0.9.5</Version>
+        <Version>0.9.6</Version>
         <OutputType>WinExe</OutputType>
         <UseWindowsForms>true</UseWindowsForms>
         <ApplicationIcon>appicon.ico</ApplicationIcon>
@@ -25,6 +25,7 @@
     </ItemGroup>
 
     <ItemGroup>
+      <ProjectReference Include="..\SpineRuntimes\SpineRuntime21\SpineRuntime21.csproj" />
       <ProjectReference Include="..\SpineRuntimes\SpineRuntime36\SpineRuntime36.csproj" />
       <ProjectReference Include="..\SpineRuntimes\SpineRuntime37\SpineRuntime37.csproj" />
       <ProjectReference Include="..\SpineRuntimes\SpineRuntime38\SpineRuntime38.csproj" />