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

2026-09-19 12:06:22 +08:00
commit 59e30822f8
314 changed files with 9259 additions and 0 deletions
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+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+// MinecraftPT — Diffuse Variance Estimation
+// Computes luminance moments to drive temporal accumulation and firefly rejection.
+
+#ifndef DIFFUSE_VARIANCE_ESTIMATION_GLSL
+#define DIFFUSE_VARIANCE_ESTIMATION_GLSL
+
+#include "/Lib/Utilities.glsl"
+
+vec2 DiffuseEstimateVariance(vec3 color, vec2 texelCoord){
+	float lum = luminance(color);
+	float lum2 = lum * lum;
+
+	// Local variance from neighbors (5-tap)
+	float variance = 0.0;
+	for (int i = -1; i <= 1; i++){
+	for (int j = -1; j <= 1; j++){
+		if (i == 0 && j == 0) continue;
+		vec3 c = texelFetch(colortex7, ivec2(texelCoord) + ivec2(i, j), 0).rgb;
+		float l = luminance(c);
+		variance += (l - lum) * (l - lum);
+	}}
+	variance /= 8.0;
+
+	// Clamp fireflies
+	float firefly = step(1.0, lum / max(variance * 4.0, 0.001));
+
+	return vec2(lum, firefly);
+}
+
+#endif