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

shaders/Lib/Programs/Gbuffers/Water_FS.glsl

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+// MinecraftPT — Water Fragment Shader
+// Writes the water GBuffer with waves, caustics data
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+
+in vec2 texcoord;
+in vec3 worldPos;
+in vec3 worldNormal;
+in vec3 vertexNormal;
+in vec4 color;
+in vec2 lightmap;
+
+layout(location = 0) out vec4 colortex0Out; // albedo + emissive
+layout(location = 1) out vec4 colortex1Out; // normals
+layout(location = 2) out vec4 colortex2Out; // spec + matID
+layout(location = 3) out vec4 colortex3Out; // lightmap
+layout(location = 4) out vec4 colortex4Out; // translucent albedo + alpha
+layout(location = 5) out vec4 colortex5Out; // translucent normal + matID
+
+#include "/Lib/IndividualFunctions/WaterWaves.glsl"
+
+void main(){
+	vec4 albedo = texture(tex, texcoord) * color;
+
+	// Water surface height / waves
+	vec3 wPos = worldPos;
+	#ifdef WAVE_PARALLAX
+		vec3 waveNormal = GetWaveNormal(wPos, lightmap.y);
+	#else
+		vec3 waveNormal = GetWaveNormal(wPos, lightmap.y);
+	#endif
+
+	// Water color — deep water tint
+	vec3 waterColor = mix(vec3(0.05, 0.15, 0.2), vec3(0.1, 0.3, 0.4), wetness * 0.5);
+
+	// Water lightmap
+	vec2 lm = lightmap;
+	lm.y = SkyLightmapCurve(lightmap.y);
+
+	// Water is translucent
+	colortex0Out = vec4(waterColor, 0.0);
+	colortex1Out = vec4(EncodeNormal(waveNormal), EncodeNormal(vertexNormal));
+	colortex2Out = vec4(0.0, 0.018, 0.0, 1.0 / 255.0); // matID = MATID_WATER
+	colortex3Out = vec4(lm, 1.0, 1.0);
+
+	// Translucent buffer: water albedo is mostly transparent, we store depth tint
+	colortex4Out = vec4(waterColor, 0.6);
+	colortex5Out = vec4(EncodeNormal(waveNormal), 1.0 / 255.0, 0.0);
+}