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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+// MinecraftPT — Tracing Noise
+// Noise functions for ray tracing (hash-based, temporally stable).
+
+#ifndef TRACING_NOISE_GLSL
+#define TRACING_NOISE_GLSL
+
+// Per-pixel temporal noise, stable across frames
+float GetTracingNoise(vec2 screenPos, int frame, int offset){
+	// Blue noise from texture + temporal interleave
+	vec2 coord = (screenPos + 0.5) / screenSize;
+	coord = fract(coord * vec2(128.0, 128.0) + 0.5);
+	vec2 texel = coord * vec2(127.0 / 128.0) + vec2(0.5 / 128.0);
+	float noise = textureLod(noisetex, texel, 0.0).r;
+	return fract(noise + (frame + offset) * 0.03125);
+}
+
+vec2 GetTracingNoise2(vec2 screenPos, int frame, int offset){
+	// 2D noise for ray directions
+	vec2 coord = (screenPos + 0.5) / screenSize;
+	coord = fract(coord * vec2(128.0, 128.0) + 0.5);
+	vec2 texel = coord * vec2(127.0 / 128.0) + vec2(0.5 / 128.0);
+	vec2 noise = textureLod(noisetex, texel, 0.0).rg;
+	return fract(noise + (frame + offset) * 0.03125);
+}
+
+// Golden-ratio based sample rotation (for progressive sampling)
+vec2 RotateNoise(vec2 uv, int sampleIndex, int totalSamples){
+	float angle = 6.28318 * float(sampleIndex) / float(totalSamples);
+	mat2 rot = mat2(cos(angle), sin(angle), -sin(angle), cos(angle));
+	return rot * uv;
+}
+
+#endif