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

shaders/Lib/IndividualFunctions/DOF.glsl

@@ -0,0 +1,37 @@
+// MinecraftPT — Depth of Field
+// Circle of confusion computation and bokeh blur.
+
+#ifndef DOF_GLSL
+#define DOF_GLSL
+
+// Compute CoC (circle of confusion) for a fragment
+float GetCoC(float depth, float focalDepth){
+	float focus = focalDepth;
+	float aperture = DOF_BLUR;
+	float coc = abs(depth - focus) / focus * aperture * DOF_MAX_COC;
+	return clamp(coc, 0.0, DOF_MAX_COC);
+}
+
+// Simple bokeh blur (gather)
+vec3 DofBlur(vec2 texelCoord, float coc){
+	vec3 color = vec3(0.0);
+	float weight = 0.0;
+
+	int radius = int(min(coc, 8.0)) + 1;
+	for (int i = -radius; i <= radius; i++){
+	for (int j = -radius; j <= radius; j++){
+		float dist = length(vec2(i, j));
+		if (dist > coc) continue;
+
+		vec2 coord = texelCoord + vec2(i, j);
+		vec3 sampleColor = texelFetch(colortex12, ivec2(coord), 0).rgb;
+		float w = max(0.0, 1.0 - dist / coc);
+
+		color += sampleColor * w;
+		weight += w;
+	}}
+
+	return weight > 0.0 ? color / weight : color;
+}
+
+#endif