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

shaders/Lib/RTWSM/BlurImportance.glsl

@@ -0,0 +1,31 @@
+// MinecraftPT — RTWSM Blur Importance
+// Gaussian-blurs the importance map to make the warp smooth.
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+
+const ivec3 workGroups = ivec3(32, 16, 1);
+layout (local_size_x = 32, local_size_y = 32) in;
+
+layout (r32f) uniform writeonly image2D img_rtwImportance2D;
+
+uniform sampler2D rtwImportance2D;
+
+void main(){
+	ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
+
+	float importance = 0.0;
+	float weightSum = 0.0;
+
+	int radius = int(RTW_BLUR_FACTOR);
+
+	for (int i = -radius; i <= radius; i++){
+	for (int j = -radius; j <= radius; j++){
+		vec2 coord = vec2(texel + ivec2(i, j)) / vec2(RTW_RESOLUTION, RTW_RESOLUTION_Y);
+		float w = exp(-(i * i + j * j) / (2.0 * RTW_BLUR_FACTOR * RTW_BLUR_FACTOR));
+		importance += textureLod(rtwImportance2D, coord, 0.0).r * w;
+		weightSum += w;
+	}}
+
+	imageStore(img_rtwImportance2D, texel, vec4(importance / weightSum));
+}