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

shaders/Lib/Programs/Gbuffers/Entities_FS.glsl

@@ -0,0 +1,60 @@
+// MinecraftPT — Entities Fragment Shader
+// Handles entities (players, mobs), hands are in Hand_FS
+
+#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;
+flat in int blockId;
+flat in float blockLightLevel;
+
+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;
+
+uniform bool isPlayer;
+
+void main(){
+	vec4 albedo = texture(tex, texcoord) * color;
+
+	if (albedo.a < 0.004) discard;
+
+	// Entity material ID — default entity
+	float matID = 6.0; // MATID_ENTITIES
+
+	// Player special handling (OptiFine provides isPlayer uniform in entities pass)
+	if (isPlayer){
+		matID = 7.0; // MATID_ENTITIES_PLAYER
+	}
+
+	vec4 specTex = vec4(0.0);
+	#ifdef TEXTURE_PBR_FORMAT
+		if (TEXTURE_PBR_FORMAT >= 1){
+			specTex = texture(atlasSpecular2D, texcoord);
+		}
+	#endif
+
+	vec2 lm = lightmap;
+	lm.y = SkyLightmapCurve(lightmap.y);
+
+	float emissive = 0.0;
+	#ifdef VANILLA_EMISSIVE
+		emissive = step(13.5, blockLightLevel) * blockLightLevel / 15.0;
+	#endif
+
+	colortex0Out = vec4(albedo.rgb, emissive);
+	colortex1Out = vec4(EncodeNormal(worldNormal), EncodeNormal(vertexNormal));
+	colortex2Out = vec4(specTex.r, specTex.g, specTex.b, matID / 255.0);
+	colortex3Out = vec4(lm, 1.0, 1.0);
+
+	colortex4Out = vec4(0.0);
+	colortex5Out = vec4(0.0);
+}