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 — Sky_Overworld_FS
+// Renders the sky into the background (colortex12) where no geometry was drawn.
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+#include "/Lib/BasicFunctions/LightingConstants.glsl"
+#include "/Lib/BasicFunctions/PrecomputedAtmosphere.glsl"
+#include "/Lib/IndividualFunctions/EndSky.glsl"
+#include "/Lib/IndividualFunctions/PlanarClouds.glsl"
+#include "/Lib/IndividualFunctions/CloudShadow.glsl"
+
+uniform sampler2D depthtex0;
+
+layout(location = 0) out vec4 colorOut;
+
+void main(){
+	ivec2 texelCoord = ivec2(gl_FragCoord.xy);
+
+	float depth = texelFetch(depthtex0, texelCoord, 0).r;
+	if (depth < 1.0){
+		// Not sky — preserve scene
+		discard;
+	}
+
+	// Reconstruct view ray
+	vec4 viewPos = gbufferProjectionInverse * vec4(vec2(texelCoord) / screenSize * 2.0 - 1.0, 1.0, 1.0);
+	vec3 viewDir = normalize(viewPos.xyz / viewPos.w);
+	vec3 worldDir = normalize(mat3(gbufferModelViewInverse) * viewDir);
+
+	vec3 sunDir = GetSunDirWorld();
+
+	// Sky radiance
+	vec3 color = GetSkyRadiance(worldDir, sunDir);
+
+	#ifdef DIMENSION_END
+		color = GetEndSky(worldDir, sunDir);
+	#elif defined DIMENSION_NETHER
+		// Nether: dark smoky red-brown atmosphere
+		color = vec3(0.18, 0.06, 0.03) * 1.2;
+		color += vec3(0.5, 0.2, 0.1) * 0.3 * (1.0 - abs(worldDir.y) * 0.5);
+	#endif
+
+	// Planar clouds
+	#ifdef PLANAR_CLOUDS
+		if (PLANAR_CLOUDS > 0){
+			// Ray-plane intersection with cloud layer
+			float cloudAlt = mix(PC_ALTITUDE, CLOUD_CLEAR_ALTITUDE, wetness * 0.5);
+			if (worldDir.y > 0.001){
+				float t = (cloudAlt - cameraPosition.y) / worldDir.y;
+				if (t > 0.0){
+					vec3 cloudPos = cameraPosition + worldDir * t;
+					vec3 cloudColor;
+					float cloudDensity = GetPlanarCloudDensity(cloudPos.xz, frameTimeCounter * CLOUD_SPEED, cloudColor);
+
+					if (cloudDensity > 0.01){
+						// Soft cloud edge
+						vec3 cloudLight = mix(GetCloudAtmoIrradiance(), GetCloudSunIrradiance(), 0.8);
+						color = mix(color, cloudLight, cloudDensity * 0.8);
+					}
+				}
+			}
+		}
+	#endif
+
+	colorOut = vec4(color, 1.0);
+}