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 — Terrain Fragment Shader
+// Writes the solid and translucent GBuffer
+
+#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; // 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
+
+// Material IDs from block.properties
+#define BLOCK_LEAVES       1
+#define BLOCK_TRANSLUCENT  2
+#define BLOCK_WATER        3
+#define BLOCK_CROSS        4
+#define BLOCK_TORCH        5
+#define BLOCK_LANTERN      6
+#define BLOCK_FIRE         7
+#define BLOCK_CAMPFIRE     8
+#define BLOCK_LAVA         9
+#define BLOCK_GLASS_PANE   10
+#define BLOCK_IRON_BARS    11
+#define BLOCK_STAIRS       12
+#define BLOCK_SLAB         13
+#define BLOCK_WALL         14
+#define BLOCK_FENCE        15
+#define BLOCK_FENCE_GATE   16
+#define BLOCK_DOOR         17
+#define BLOCK_RAIL         18
+#define BLOCK_REDSTONE     19
+#define BLOCK_ENDROD       20
+#define BLOCK_CHAIN        21
+#define BLOCK_AMETHYST     22
+#define BLOCK_CANDLE       23
+#define BLOCK_GLOWSTONE    24
+#define BLOCK_LIGHT        25
+#define BLOCK_PORTAL       26
+#define BLOCK_LADDER       27
+#define BLOCK_SUGARCANE    28
+#define BLOCK_BAMBOO       29
+#define BLOCK_CACTUS       30
+#define BLOCK_CHORUS       31
+#define BLOCK_CORAL        32
+#define BLOCK_DRIPSTONE    33
+#define BLOCK_CONDUIT      34
+#define BLOCK_LIGHTNING_ROD 35
+#define BLOCK_POT          36
+#define BLOCK_SNOW_LAYERS  37
+#define BLOCK_COBWEB       80
+
+void main(){
+	vec4 albedo = texture(tex, texcoord) * color;
+
+	// Cutout (alpha test)
+	if (albedo.a < 0.004) discard;
+
+	// Material ID determination
+	float matID = 0.0;   // MATID_DEFAULT
+	#ifdef IS_HAND
+		matID = 5.0;    // MATID_HAND
+	#endif
+	bool isTranslucent = false;
+
+	if (blockId == BLOCK_LEAVES){
+		matID = 3.0;    // MATID_LEAVES
+	}else if (blockId == BLOCK_TRANSLUCENT){
+		matID = 2.0;    // MATID_STAINEDGLASS
+		isTranslucent = true;
+	}else if (blockId == BLOCK_WATER){
+		matID = 1.0;    // MATID_WATER (should be handled by gbuffers_water)
+		isTranslucent = true;
+	}else if (blockId == BLOCK_CROSS){
+		matID = 4.0;    // MATID_GRASS
+	}else if (blockId == BLOCK_TORCH){
+		matID = 11.0;   // MATID_TORCH
+	}else if (blockId == BLOCK_LANTERN){
+		matID = 20.0;   // MATID_COPPER_LANTERN
+	}else if (blockId == BLOCK_FIRE || blockId == BLOCK_CAMPFIRE){
+		matID = 12.0;   // MATID_FIRE
+	}else if (blockId == BLOCK_LAVA){
+		matID = 12.0;
+	}else if (blockId == BLOCK_GLASS_PANE){
+		matID = 2.0;    // MATID_STAINEDGLASS
+		isTranslucent = true;
+	}else if (blockId == BLOCK_ENDROD){
+		matID = 13.0;   // MATID_ENDROD
+	}else if (blockId == BLOCK_AMETHYST){
+		matID = 14.0;   // MATID_AMETHYST
+	}else if (blockId == BLOCK_PORTAL){
+		matID = 18.0;   // MATID_END_PORTAL
+	}else if (blockId == BLOCK_COBWEB){
+		matID = 17.0;   // MATID_PARTICLE-like
+		isTranslucent = true;
+	}
+
+	// Emissive detection
+	float emissive = 0.0;
+	#ifdef HARDCODED_EMISSIVENESS_MODE
+		if (blockId == BLOCK_LAVA || blockId == BLOCK_FIRE || blockId == BLOCK_CAMPFIRE ||
+			blockId == BLOCK_GLOWSTONE || blockId == BLOCK_ENDROD || blockId == BLOCK_LANTERN ||
+			blockId == BLOCK_AMETHYST || blockId == BLOCK_TORCH || blockId == BLOCK_CANDLE ||
+			blockId == BLOCK_LIGHT || blockId == BLOCK_CONDUIT){
+			emissive = 1.0;
+		}
+	#endif
+
+	#ifdef VANILLA_EMISSIVE
+		// Emissive blocks from vanilla light level (at_midBlock.w = 0-15)
+		emissive = max(emissive, step(13.5, blockLightLevel) * blockLightLevel / 15.0);
+	#endif
+
+	// LAB PBR specular
+	vec4 specTex = vec4(0.0);
+	#ifdef TEXTURE_PBR_FORMAT
+		if (TEXTURE_PBR_FORMAT >= 1 && blockId != BLOCK_WATER){
+			specTex = texture(atlasSpecular2D, texcoord);
+		}
+	#endif
+
+	// Lightmap
+	vec2 lm = lightmap;
+	lm.y = SkyLightmapCurve(lightmap.y);
+
+	// Parallax shadow (POM)
+	float parallaxShadow = 1.0;
+
+	// Encode normals (octahedral)
+	vec2 worldNormalEnc = EncodeNormal(worldNormal);
+	vec2 vertexNormalEnc = EncodeNormal(vertexNormal);
+
+	// Solid write
+	colortex0Out = vec4(albedo.rgb, emissive);
+	colortex1Out = vec4(worldNormalEnc, vertexNormalEnc);
+	colortex2Out = vec4(specTex.r, specTex.g, specTex.b, matID / 255.0);
+	colortex3Out = vec4(lm, parallaxShadow, 1.0);
+
+	// Translucent write (glass, panes, cobweb)
+	if (isTranslucent){
+		colortex4Out = vec4(albedo.rgb, albedo.a);
+		colortex5Out = vec4(worldNormalEnc, matID / 255.0, specTex.r);
+	}else{
+		colortex4Out = vec4(0.0);
+		colortex5Out = vec4(0.0);
+	}
+}