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

shaders/Lib/BasicFunctions/VanillaComposite.glsl

@@ -0,0 +1,17 @@
+// MinecraftPT — Vanilla Composite helpers
+// Sky/cloud colors approximating vanilla for transitions and fog.
+
+#ifndef VANILLA_COMPOSITE_GLSL
+#define VANILLA_COMPOSITE_GLSL
+
+vec3 GetVanillaSkyColor(vec3 dir){
+	vec3 skyColor = vec3(0.6, 0.8, 1.0);
+	float horizon = exp(-max(dir.y, 0.0) * 3.0);
+	return mix(skyColor * 0.3, skyColor, 1.0 - horizon);
+}
+
+vec3 GetVanillaFogColor(vec3 skyColor, float nightFactor){
+	return mix(skyColor, skyColor * vec3(0.2, 0.25, 0.4), nightFactor);
+}
+
+#endif