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
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+// MinecraftPT — SpecularTracing_FS
+// Specular reflection path tracing at half resolution.
+// Output: colortex9 = noisy specular, colortex11 = history (ping-pong)
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+#include "/Lib/BasicFunctions/LightingConstants.glsl"
+#include "/Lib/GbufferData.glsl"
+#include "/Lib/PathTracing/Tracer/TracingNoise.glsl"
+#include "/Lib/PathTracing/Tracer/TracingUtilities.glsl"
+#include "/Lib/PathTracing/Tracer/SpecularTracer.glsl"
+#include "/Lib/BasicFunctions/TemporalNoise.glsl"
+
+layout(location = 0) out vec4 specularOut;
+
+void main(){
+	ivec2 texelCoord = ivec2(gl_FragCoord.xy);
+	ivec2 fullCoord = texelCoord * 2;
+
+	float depth = texelFetch(depthtex0, fullCoord, 0).r;
+	if (depth >= 1.0){
+		specularOut = vec4(0.0);
+		return;
+	}
+
+	vec4 normalData = texelFetch(colortex1, fullCoord, 0);
+	vec3 worldNormal = DecodeNormal(normalData.xy);
+	vec4 materialData = texelFetch(colortex2, fullCoord, 0);
+
+	float roughness = 1.0 - materialData.r;
+	roughness = roughness * roughness;
+	float metalness = materialData.g;
+
+	// Skip rough non-metal surfaces when rough specular is disabled
+	#if ENABLE_ROUGH_SPECULAR == 0
+		if (roughness > 0.5 && metalness < 0.04){
+			specularOut = vec4(0.0);
+			return;
+		}
+	#endif
+
+	// Reconstruct view position
+	vec4 viewPos = gbufferProjectionInverse * vec4(vec2(fullCoord) / screenSize * 2.0 - 1.0, depth * 2.0 - 1.0, 1.0);
+	viewPos.xyz /= viewPos.w;
+
+	vec3 worldPos = gbufferModelViewInverse[3].xyz + viewPos.xyz;
+	vec3 viewDir = normalize(-viewPos.xyz);
+
+	vec2 noise = GetTracingNoise2(vec2(texelCoord), frameCounter, 1);
+
+	// Importance-sample GGX reflection direction
+	vec3 reflDir = ImportanceSampleGGX(noise, worldNormal, roughness);
+
+	// Or use pure reflection for smooth surfaces
+	if (roughness < 0.05){
+		reflDir = reflect(-viewDir, worldNormal);
+	}
+
+	// Trace the specular ray
+	vec3 result = SpecularTrace(WorldToVoxel(worldPos + worldNormal * 0.02), reflDir, PT_SPECULAR_TRACING_DISTANCE, noise);
+
+	specularOut = vec4(result, 1.0);
+}