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 — Bloom_CS
+// Bloom compute passes: two downsample levels + axial blur X/Y.
+// Uses two alternating images (bloomA/bloomB) to avoid read-write conflicts.
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+
+const ivec3 workGroups = ivec3(int(ceil(viewWidth * 0.03125)), int(ceil(viewHeight * 0.03125)), 1);
+layout (local_size_x = 8, local_size_y = 8) in;
+
+layout (rgba16f) uniform writeonly image2D img_bloomA;
+layout (rgba16f) uniform writeonly image2D img_bloomB;
+
+uniform sampler2D colortex12;
+uniform sampler2D bloomA;
+uniform sampler2D bloomB;
+
+// Downsample pass
+#ifdef PROGRAM_BLOOM_DOWNSAMPLE
+	void main(){
+		ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
+
+		vec3 color = vec3(0.0);
+
+		#if PROGRAM_BLOOM_DOWNSAMPLE_LEVEL == 1
+			// Level 1: 2x2 box from the HDR scene -> bloomA
+			for (int i = 0; i < 2; i++){
+			for (int j = 0; j < 2; j++){
+				color += texelFetch(colortex12, texel * 2 + ivec2(i, j), 0).rgb;
+			}}
+			color *= 0.25;
+
+			float brightness = luminance(color);
+			color *= saturate(brightness * BLOOM_CLAMP_STRENGTH);
+
+			ivec2 imgSize = imageSize(img_bloomA);
+			if (all(lessThan(texel, imgSize))){
+				imageStore(img_bloomA, texel, vec4(color, 1.0));
+			}
+
+		#else
+			// Level 2: 2x2 box from bloomA -> bloomB
+			for (int i = 0; i < 2; i++){
+			for (int j = 0; j < 2; j++){
+				color += texelFetch(bloomA, texel * 2 + ivec2(i, j), 0).rgb;
+			}}
+			color *= 0.25;
+
+			float brightness = luminance(color);
+			color *= saturate(brightness * BLOOM_CLAMP_STRENGTH);
+
+			ivec2 imgSize = imageSize(img_bloomB);
+			if (all(lessThan(texel, imgSize))){
+				imageStore(img_bloomB, texel, vec4(color, 1.0));
+			}
+
+		#endif
+	}
+#endif
+
+// Axial blur pass (X or Y depending on defines)
+#ifdef PROGRAM_BLOOM_AXIALBLUR
+	void main(){
+		ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
+		ivec2 imgSize = imageSize(img_bloomA);
+		if (any(greaterThanEqual(texel, imgSize))) return;
+
+		vec2 uv = (vec2(texel) + 0.5) / vec2(imgSize);
+
+		// Which buffer to read (BLOOM_AXIAL_READ_A defined for the pass reading bloomA)
+		#ifdef BLOOM_AXIAL_READ_A
+			sampler2D src = bloomA;
+		#else
+			sampler2D src = bloomB;
+		#endif
+
+		#ifdef PROGRAM_BLOOM_AXIALBLUR_X
+			vec2 axis = vec2(1.0, 0.0);
+		#else
+			vec2 axis = vec2(0.0, 1.0);
+		#endif
+
+		vec3 color = vec3(0.0);
+		float weightSum = 0.0;
+
+		for (int i = -8; i <= 8; i++){
+			vec2 coord = uv + axis * float(i) / vec2(imgSize);
+			float w = exp(-float(i * i) * 0.05);
+			color += textureLod(src, coord, 0.0).rgb * w;
+			weightSum += w;
+		}
+
+		// Write to the opposite buffer of the read source
+		#ifdef BLOOM_AXIAL_READ_A
+			imageStore(img_bloomB, texel, vec4(color / weightSum, 1.0));
+		#else
+			imageStore(img_bloomA, texel, vec4(color / weightSum, 1.0));
+		#endif
+	}
+#endif