Initial commit: Minecraft 光追着色器包（从零实现的 path tracing）

shaders/Lib/Programs/Composite/DepthCopy_CS.glsl

@@ -0,0 +1,19 @@
+// MinecraftPT — DepthCopy_CS
+// Copies the current frame depth to prevDepth2D at the end of the frame,
+// so temporal filters in the next frame have the previous depth for
+// reprojection validation.
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+
+const ivec3 workGroups = ivec3(int(ceil(viewWidth * 0.0625)), int(ceil(viewHeight * 0.0625)), 1);
+layout (local_size_x = 8, local_size_y = 8) in;
+
+layout (r32f) uniform writeonly image2D img_prevDepth2D;
+
+uniform sampler2D depthtex0;
+
+void main(){
+	ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
+	imageStore(img_prevDepth2D, texel, vec4(texelFetch(depthtex0, texel * 2, 0).r));
+}