更换为wpf

Spine/Utils/SFMLShader.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SFML.Graphics;
+
+namespace Spine.Utils
+{
+    public static class SFMLShader
+    {
+        /// <summary>
+        /// 用于非预乘纹理的 fragment shader, 乘上了插值后的透明度用于实现透明度变化(插值预乘), 并且输出预乘后的像素值
+        /// </summary>
+        private const string FRAGMENT_VertexAlpha = 
+            "uniform sampler2D t;" +
+            "void main() { vec4 p = texture(t, gl_TexCoord[0].xy);" +
+            "p.rgb *= p.a * gl_Color.a;" +
+            "gl_FragColor = gl_Color * p; }"
+        ;
+
+        /// <summary>
+        /// 用于预乘纹理的 fragment shader, 乘上了插值后的透明度用于实现透明度变化(插值预乘)
+        /// </summary>
+        private const string FRAGMENT_VertexAlphaPma = 
+            "uniform sampler2D t;" +
+            "void main() { vec4 p = texture(t, gl_TexCoord[0].xy);" +
+            "p.rgb *= gl_Color.a;" +
+            "gl_FragColor = gl_Color * p; }"
+        ;
+
+        /// <summary>
+        /// 预乘转非预乘 fragment shader
+        /// </summary>
+        private const string FRAGMENT_InvPma = 
+            "uniform sampler2D t;" +
+            "void main() { vec4 p = texture(t, gl_TexCoord[0].xy);" +
+            "if (p.a > 0) p.rgb /= max(max(max(p.r, p.g), p.b), p.a);" +
+            "gl_FragColor = p; }"
+        ;
+
+        /// <summary>
+        /// 考虑了顶点透明度变化的着色器, 输入是非预乘纹理像素, 输出是预乘像素
+        /// </summary>
+        public static Shader? VertexAlpha { get; }
+
+        /// <summary>
+        /// 考虑了顶点透明度变化的着色器, 输入和输出均是预乘像素值
+        /// </summary>
+        public static Shader? VertexAlphaPma { get; }
+
+        /// <summary>
+        /// 反预乘着色器, 用于得到正确透明度的非预乘画面
+        /// </summary>
+        public static Shader? InversePma { get; }
+
+        /// <summary>
+        /// 加载 Shader, 可能会存在异常导致着色器加载失败, 会在日志中输出信息
+        /// </summary>
+        static SFMLShader()
+        {
+            try
+            {
+                VertexAlpha = Shader.FromString(null, null, FRAGMENT_VertexAlpha);
+                VertexAlphaPma = Shader.FromString(null, null, FRAGMENT_VertexAlphaPma);
+                InversePma = Shader.FromString(null, null, FRAGMENT_InvPma);
+            }
+            catch (Exception ex)
+            {
+                var logger = NLog.LogManager.GetCurrentClassLogger();
+                logger.Trace(ex.ToString());
+                logger.Error("Failed to init shaders, {0}", ex.Message);
+            }
+        }
+    }
+}