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 — RTWSM Building Warp
+// Builds the final warp curve (cumulative importance) from the importance map.
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+
+const ivec3 workGroups = ivec3(32, 1, 1);
+layout (local_size_x = 32) in;
+
+layout (rg16) uniform writeonly image2D img_rtwWarp1D;
+
+uniform sampler2D rtwImportance2D;
+
+void main(){
+	int y = int(gl_GlobalInvocationID.y);
+
+	// Compute the cumulative importance curve for this row
+	float total = 0.0;
+	for (int x = 0; x < RTW_RESOLUTION; x++){
+		total += textureLod(rtwImportance2D, vec2(float(x) / float(RTW_RESOLUTION), float(y) / float(RTW_RESOLUTION_Y)), 0.0).r;
+	}
+
+	// Write warp curve: row 0 = cumulative, row 1 = inverse
+	if (total > 0.0){
+		float cum = 0.0;
+		for (int x = 0; x < RTW_RESOLUTION; x++){
+			cum += textureLod(rtwImportance2D, vec2(float(x) / float(RTW_RESOLUTION), float(y) / float(RTW_RESOLUTION_Y)), 0.0).r;
+			imageStore(img_rtwWarp1D, ivec2(x, 0), vec4(cum / total, 0.0, 0.0, 0.0));
+		}
+
+		// Inverse: for each output position find input position
+		for (int x = 0; x < RTW_RESOLUTION; x++){
+			float target = float(x) / float(RTW_RESOLUTION - 1);
+			int lo = 0;
+			int hi = RTW_RESOLUTION - 1;
+			for (int i = 0; i < 10; i++){
+				int mid = (lo + hi) / 2;
+				float v = textureLod(rtwImportance2D, vec2(float(mid) / float(RTW_RESOLUTION), float(y) / float(RTW_RESOLUTION_Y)), 0.0).r;
+				if (v < target) lo = mid; else hi = mid;
+			}
+			float inv = float(lo) / float(RTW_RESOLUTION);
+			imageStore(img_rtwWarp1D, ivec2(x, 1), vec4(inv, 0.0, 0.0, 0.0));
+		}
+	}else{
+		// Identity warp
+		for (int x = 0; x < RTW_RESOLUTION; x++){
+			float v = float(x) / float(RTW_RESOLUTION);
+			imageStore(img_rtwWarp1D, ivec2(x, 0), vec4(v, 0.0, 0.0, 0.0));
+			imageStore(img_rtwWarp1D, ivec2(x, 1), vec4(v, 0.0, 0.0, 0.0));
+		}
+	}
+}