Initial commit: Minecraft 光追着色器包（从零实现的 path tracing）

shaders/Lib/Programs/Gbuffers/Skytextured_FS.glsl

@@ -0,0 +1,30 @@
+// MinecraftPT — Sky Fragment Shader
+// Writes sky color into GBuffer with MATID_SKY so composite can identify it.
+// Custom sky is drawn in composite20 (Sky_Overworld_FS) over this.
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+
+in vec2 texcoord;
+in vec3 worldPos;
+in vec4 color;
+
+layout(location = 0) out vec4 colortex0Out;
+layout(location = 1) out vec4 colortex1Out;
+layout(location = 2) out vec4 colortex2Out;
+layout(location = 3) out vec4 colortex3Out;
+layout(location = 4) out vec4 colortex4Out;
+layout(location = 5) out vec4 colortex5Out;
+
+void main(){
+	vec4 albedo = texture(tex, texcoord) * color;
+
+	// Sky: mark with MATID_SKY
+	colortex0Out = vec4(albedo.rgb, 0.0);
+	colortex1Out = vec4(0.5);
+	colortex2Out = vec4(0.0, 0.0, 0.0, 10.0 / 255.0); // MATID_SKY
+	colortex3Out = vec4(1.0, 1.0, 1.0, 1.0);
+
+	colortex4Out = vec4(0.0);
+	colortex5Out = vec4(0.0);
+}