348 lines
13 KiB
TypeScript
Executable File
348 lines
13 KiB
TypeScript
Executable File
/******************************************************************************
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* Spine Runtimes License Agreement
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* Last updated January 1, 2020. Replaces all prior versions.
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*
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* Copyright (c) 2013-2020, Esoteric Software LLC
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*
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* Integration of the Spine Runtimes into software or otherwise creating
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* derivative works of the Spine Runtimes is permitted under the terms and
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* conditions of Section 2 of the Spine Editor License Agreement:
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* http://esotericsoftware.com/spine-editor-license
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*
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* Otherwise, it is permitted to integrate the Spine Runtimes into software
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* or otherwise create derivative works of the Spine Runtimes (collectively,
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* "Products"), provided that each user of the Products must obtain their own
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* Spine Editor license and redistribution of the Products in any form must
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* include this license and copyright notice.
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*
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* THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
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* BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*****************************************************************************/
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module spine {
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export class SkeletonClipping {
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private triangulator = new Triangulator();
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private clippingPolygon = new Array<number>();
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private clipOutput = new Array<number>();
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clippedVertices = new Array<number>();
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clippedTriangles = new Array<number>();
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private scratch = new Array<number>();
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private clipAttachment: ClippingAttachment;
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private clippingPolygons: Array<Array<number>>;
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clipStart (slot: Slot, clip: ClippingAttachment): number {
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if (this.clipAttachment != null) return 0;
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this.clipAttachment = clip;
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let n = clip.worldVerticesLength;
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let vertices = Utils.setArraySize(this.clippingPolygon, n);
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clip.computeWorldVertices(slot, 0, n, vertices, 0, 2);
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let clippingPolygon = this.clippingPolygon;
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SkeletonClipping.makeClockwise(clippingPolygon);
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let clippingPolygons = this.clippingPolygons = this.triangulator.decompose(clippingPolygon, this.triangulator.triangulate(clippingPolygon));
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for (let i = 0, n = clippingPolygons.length; i < n; i++) {
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let polygon = clippingPolygons[i];
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SkeletonClipping.makeClockwise(polygon);
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polygon.push(polygon[0]);
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polygon.push(polygon[1]);
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}
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return clippingPolygons.length;
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}
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clipEndWithSlot (slot: Slot) {
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if (this.clipAttachment != null && this.clipAttachment.endSlot == slot.data) this.clipEnd();
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}
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clipEnd () {
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if (this.clipAttachment == null) return;
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this.clipAttachment = null;
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this.clippingPolygons = null;
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this.clippedVertices.length = 0;
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this.clippedTriangles.length = 0;
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this.clippingPolygon.length = 0;
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}
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isClipping (): boolean {
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return this.clipAttachment != null;
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}
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clipTriangles (vertices: ArrayLike<number>, verticesLength: number, triangles: ArrayLike<number>, trianglesLength: number, uvs: ArrayLike<number>,
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light: Color, dark: Color, twoColor: boolean) {
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let clipOutput = this.clipOutput, clippedVertices = this.clippedVertices;
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let clippedTriangles = this.clippedTriangles;
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let polygons = this.clippingPolygons;
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let polygonsCount = this.clippingPolygons.length;
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let vertexSize = twoColor ? 12 : 8;
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let index = 0;
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clippedVertices.length = 0;
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clippedTriangles.length = 0;
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outer:
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for (let i = 0; i < trianglesLength; i += 3) {
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let vertexOffset = triangles[i] << 1;
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let x1 = vertices[vertexOffset], y1 = vertices[vertexOffset + 1];
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let u1 = uvs[vertexOffset], v1 = uvs[vertexOffset + 1];
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vertexOffset = triangles[i + 1] << 1;
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let x2 = vertices[vertexOffset], y2 = vertices[vertexOffset + 1];
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let u2 = uvs[vertexOffset], v2 = uvs[vertexOffset + 1];
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vertexOffset = triangles[i + 2] << 1;
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let x3 = vertices[vertexOffset], y3 = vertices[vertexOffset + 1];
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let u3 = uvs[vertexOffset], v3 = uvs[vertexOffset + 1];
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for (let p = 0; p < polygonsCount; p++) {
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let s = clippedVertices.length;
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if (this.clip(x1, y1, x2, y2, x3, y3, polygons[p], clipOutput)) {
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let clipOutputLength = clipOutput.length;
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if (clipOutputLength == 0) continue;
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let d0 = y2 - y3, d1 = x3 - x2, d2 = x1 - x3, d4 = y3 - y1;
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let d = 1 / (d0 * d2 + d1 * (y1 - y3));
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let clipOutputCount = clipOutputLength >> 1;
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let clipOutputItems = this.clipOutput;
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let clippedVerticesItems = Utils.setArraySize(clippedVertices, s + clipOutputCount * vertexSize);
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for (let ii = 0; ii < clipOutputLength; ii += 2) {
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let x = clipOutputItems[ii], y = clipOutputItems[ii + 1];
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clippedVerticesItems[s] = x;
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clippedVerticesItems[s + 1] = y;
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clippedVerticesItems[s + 2] = light.r;
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clippedVerticesItems[s + 3] = light.g;
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clippedVerticesItems[s + 4] = light.b;
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clippedVerticesItems[s + 5] = light.a;
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let c0 = x - x3, c1 = y - y3;
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let a = (d0 * c0 + d1 * c1) * d;
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let b = (d4 * c0 + d2 * c1) * d;
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let c = 1 - a - b;
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clippedVerticesItems[s + 6] = u1 * a + u2 * b + u3 * c;
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clippedVerticesItems[s + 7] = v1 * a + v2 * b + v3 * c;
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if (twoColor) {
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clippedVerticesItems[s + 8] = dark.r;
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clippedVerticesItems[s + 9] = dark.g;
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clippedVerticesItems[s + 10] = dark.b;
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clippedVerticesItems[s + 11] = dark.a;
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}
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s += vertexSize;
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}
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s = clippedTriangles.length;
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let clippedTrianglesItems = Utils.setArraySize(clippedTriangles, s + 3 * (clipOutputCount - 2));
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clipOutputCount--;
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for (let ii = 1; ii < clipOutputCount; ii++) {
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clippedTrianglesItems[s] = index;
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clippedTrianglesItems[s + 1] = (index + ii);
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clippedTrianglesItems[s + 2] = (index + ii + 1);
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s += 3;
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}
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index += clipOutputCount + 1;
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} else {
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let clippedVerticesItems = Utils.setArraySize(clippedVertices, s + 3 * vertexSize);
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clippedVerticesItems[s] = x1;
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clippedVerticesItems[s + 1] = y1;
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clippedVerticesItems[s + 2] = light.r;
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clippedVerticesItems[s + 3] = light.g;
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clippedVerticesItems[s + 4] = light.b;
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clippedVerticesItems[s + 5] = light.a;
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if (!twoColor) {
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clippedVerticesItems[s + 6] = u1;
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clippedVerticesItems[s + 7] = v1;
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clippedVerticesItems[s + 8] = x2;
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clippedVerticesItems[s + 9] = y2;
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clippedVerticesItems[s + 10] = light.r;
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clippedVerticesItems[s + 11] = light.g;
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clippedVerticesItems[s + 12] = light.b;
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clippedVerticesItems[s + 13] = light.a;
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clippedVerticesItems[s + 14] = u2;
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clippedVerticesItems[s + 15] = v2;
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clippedVerticesItems[s + 16] = x3;
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clippedVerticesItems[s + 17] = y3;
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clippedVerticesItems[s + 18] = light.r;
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clippedVerticesItems[s + 19] = light.g;
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clippedVerticesItems[s + 20] = light.b;
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clippedVerticesItems[s + 21] = light.a;
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clippedVerticesItems[s + 22] = u3;
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clippedVerticesItems[s + 23] = v3;
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} else {
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clippedVerticesItems[s + 6] = u1;
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clippedVerticesItems[s + 7] = v1;
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clippedVerticesItems[s + 8] = dark.r;
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clippedVerticesItems[s + 9] = dark.g;
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clippedVerticesItems[s + 10] = dark.b;
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clippedVerticesItems[s + 11] = dark.a;
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clippedVerticesItems[s + 12] = x2;
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clippedVerticesItems[s + 13] = y2;
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clippedVerticesItems[s + 14] = light.r;
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clippedVerticesItems[s + 15] = light.g;
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clippedVerticesItems[s + 16] = light.b;
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clippedVerticesItems[s + 17] = light.a;
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clippedVerticesItems[s + 18] = u2;
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clippedVerticesItems[s + 19] = v2;
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clippedVerticesItems[s + 20] = dark.r;
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clippedVerticesItems[s + 21] = dark.g;
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clippedVerticesItems[s + 22] = dark.b;
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clippedVerticesItems[s + 23] = dark.a;
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clippedVerticesItems[s + 24] = x3;
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clippedVerticesItems[s + 25] = y3;
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clippedVerticesItems[s + 26] = light.r;
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clippedVerticesItems[s + 27] = light.g;
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clippedVerticesItems[s + 28] = light.b;
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clippedVerticesItems[s + 29] = light.a;
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clippedVerticesItems[s + 30] = u3;
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clippedVerticesItems[s + 31] = v3;
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clippedVerticesItems[s + 32] = dark.r;
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clippedVerticesItems[s + 33] = dark.g;
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clippedVerticesItems[s + 34] = dark.b;
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clippedVerticesItems[s + 35] = dark.a;
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}
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s = clippedTriangles.length;
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let clippedTrianglesItems = Utils.setArraySize(clippedTriangles, s + 3);
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clippedTrianglesItems[s] = index;
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clippedTrianglesItems[s + 1] = (index + 1);
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clippedTrianglesItems[s + 2] = (index + 2);
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index += 3;
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continue outer;
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}
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}
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}
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}
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/** Clips the input triangle against the convex, clockwise clipping area. If the triangle lies entirely within the clipping
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* area, false is returned. The clipping area must duplicate the first vertex at the end of the vertices list. */
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clip (x1: number, y1: number, x2: number, y2: number, x3: number, y3: number, clippingArea: Array<number>, output: Array<number>) {
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let originalOutput = output;
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let clipped = false;
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// Avoid copy at the end.
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let input: Array<number> = null;
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if (clippingArea.length % 4 >= 2) {
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input = output;
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output = this.scratch;
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} else
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input = this.scratch;
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input.length = 0;
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input.push(x1);
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input.push(y1);
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input.push(x2);
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input.push(y2);
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input.push(x3);
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input.push(y3);
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input.push(x1);
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input.push(y1);
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output.length = 0;
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let clippingVertices = clippingArea;
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let clippingVerticesLast = clippingArea.length - 4;
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for (let i = 0;; i += 2) {
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let edgeX = clippingVertices[i], edgeY = clippingVertices[i + 1];
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let edgeX2 = clippingVertices[i + 2], edgeY2 = clippingVertices[i + 3];
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let deltaX = edgeX - edgeX2, deltaY = edgeY - edgeY2;
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let inputVertices = input;
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let inputVerticesLength = input.length - 2, outputStart = output.length;
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for (let ii = 0; ii < inputVerticesLength; ii += 2) {
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let inputX = inputVertices[ii], inputY = inputVertices[ii + 1];
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let inputX2 = inputVertices[ii + 2], inputY2 = inputVertices[ii + 3];
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let side2 = deltaX * (inputY2 - edgeY2) - deltaY * (inputX2 - edgeX2) > 0;
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if (deltaX * (inputY - edgeY2) - deltaY * (inputX - edgeX2) > 0) {
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if (side2) { // v1 inside, v2 inside
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output.push(inputX2);
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output.push(inputY2);
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continue;
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}
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// v1 inside, v2 outside
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let c0 = inputY2 - inputY, c2 = inputX2 - inputX;
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let s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
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if (Math.abs(s) > 0.000001) {
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let ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
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output.push(edgeX + (edgeX2 - edgeX) * ua);
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output.push(edgeY + (edgeY2 - edgeY) * ua);
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} else {
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output.push(edgeX);
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output.push(edgeY);
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}
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} else if (side2) { // v1 outside, v2 inside
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let c0 = inputY2 - inputY, c2 = inputX2 - inputX;
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let s = c0 * (edgeX2 - edgeX) - c2 * (edgeY2 - edgeY);
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if (Math.abs(s) > 0.000001) {
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let ua = (c2 * (edgeY - inputY) - c0 * (edgeX - inputX)) / s;
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output.push(edgeX + (edgeX2 - edgeX) * ua);
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output.push(edgeY + (edgeY2 - edgeY) * ua);
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} else {
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output.push(edgeX);
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output.push(edgeY);
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}
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output.push(inputX2);
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output.push(inputY2);
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}
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clipped = true;
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}
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if (outputStart == output.length) { // All edges outside.
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originalOutput.length = 0;
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return true;
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}
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output.push(output[0]);
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output.push(output[1]);
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if (i == clippingVerticesLast) break;
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let temp = output;
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output = input;
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output.length = 0;
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input = temp;
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}
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if (originalOutput != output) {
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originalOutput.length = 0;
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for (let i = 0, n = output.length - 2; i < n; i++)
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originalOutput[i] = output[i];
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} else
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originalOutput.length = originalOutput.length - 2;
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return clipped;
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}
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public static makeClockwise (polygon: ArrayLike<number>) {
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let vertices = polygon;
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let verticeslength = polygon.length;
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let area = vertices[verticeslength - 2] * vertices[1] - vertices[0] * vertices[verticeslength - 1], p1x = 0, p1y = 0, p2x = 0, p2y = 0;
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for (let i = 0, n = verticeslength - 3; i < n; i += 2) {
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p1x = vertices[i];
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p1y = vertices[i + 1];
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p2x = vertices[i + 2];
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p2y = vertices[i + 3];
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area += p1x * p2y - p2x * p1y;
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}
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if (area < 0) return;
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for (let i = 0, lastX = verticeslength - 2, n = verticeslength >> 1; i < n; i += 2) {
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let x = vertices[i], y = vertices[i + 1];
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let other = lastX - i;
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vertices[i] = vertices[other];
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vertices[i + 1] = vertices[other + 1];
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vertices[other] = x;
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vertices[other + 1] = y;
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}
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}
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}
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}
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