Initial commit: Minecraft 光追着色器包（从零实现的 path tracing）
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#include "/Lib/Settings.glsl"
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#include "/Lib/Utilities.glsl"
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// MinecraftPT — GbufferData structures
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#ifndef GBUFFER_DATA_GLSL
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#define GBUFFER_DATA_GLSL
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struct Material{
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float roughness;
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float metalness;
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float emissiveness;
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float scattering;
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float reflectionStrength;
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};
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struct GbufferData{
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vec3 albedo;
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float albedoAlpha;
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vec3 worldNormal;
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vec3 vertexNormal;
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vec2 lightmap;
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float materialID;
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float parallaxShadow;
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Material material;
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};
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// Standard material defaults
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#define material_air Material(1.0, 0.0, 0.0, 0.0, 0.0);
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#define material_water Material(0.0, 0.018, 0.0, 0.0, 1.0);
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#define material_glass Material(0.0, 0.04, 0.0, 0.0, 1.0);
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// Material IDs (written to GBuffer)
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#define MATID_DEFAULT 0.0
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#define MATID_WATER 1.0
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#define MATID_STAINEDGLASS 2.0
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#define MATID_LEAVES 3.0
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#define MATID_GRASS 4.0 // cross plant
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#define MATID_HAND 5.0
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#define MATID_ENTITIES 6.0
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#define MATID_ENTITIES_PLAYER 7.0
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#define MATID_ENTITIES_SNOW 8.0
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#define MATID_LIGHTNING 9.0
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#define MATID_SKY 10.0
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#define MATID_TORCH 11.0
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#define MATID_FIRE 12.0
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#define MATID_ENDROD 13.0
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#define MATID_AMETHYST 14.0
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#define MATID_SOULTORCH 15.0
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#define MATID_REDSTONE_TORCH 16.0
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#define MATID_PARTICLE 17.0
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#define MATID_END_PORTAL 18.0
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#define MATID_SELECTION 19.0
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#define MATID_COPPER_LANTERN 20.0
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#define MATID_BEACON_BEAM 21.0
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// Material from specular texture (LAB PBR)
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Material MaterialFromTex(vec4 specTex){
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Material material;
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material.roughness = 1.0 - specTex.r;
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material.roughness = material.roughness * material.roughness;
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material.metalness = specTex.g;
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material.reflectionStrength = saturate(material.roughness < 0.1 ? 1.0 : pow(specTex.r, 0.2));
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material.reflectionStrength = saturate(material.reflectionStrength + material.metalness);
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material.metalness = max(material.metalness, 0.04);
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material.emissiveness = specTex.a;
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material.scattering = 0.0;
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return material;
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}
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// Predefined metal F0 values (from LAB PBR spec)
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vec3 PredefinedMetalF0(float index){
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vec3 f0 = vec3(0.0);
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if (abs(index - 230.0 / 255.0) < 2e-4){
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f0 = vec3(0.56, 0.58, 0.58); // Iron
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}else if (abs(index - 231.0 / 255.0) < 2e-4){
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f0 = vec3(1.00, 0.69, 0.28); // Gold
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}else if (abs(index - 232.0 / 255.0) < 2e-4){
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f0 = vec3(0.81, 0.82, 0.83); // Aluminum
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}else if (abs(index - 233.0 / 255.0) < 2e-4){
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f0 = vec3(0.50, 0.49, 0.49); // Chromium
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}else if (abs(index - 234.0 / 255.0) < 2e-4){
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f0 = vec3(0.95, 0.52, 0.35); // Copper
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}else if (abs(index - 235.0 / 255.0) < 2e-4){
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f0 = vec3(0.81, 0.83, 0.87); // Lead
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}else if (abs(index - 236.0 / 255.0) < 2e-4){
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f0 = vec3(0.66, 0.63, 0.58); // Platinum
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}else if (abs(index - 237.0 / 255.0) < 2e-4){
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f0 = vec3(0.95, 0.91, 0.81); // Silver
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}
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return f0;
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}
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// Read solid GBuffer data
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GbufferData GetGbufferDataSoild(ivec2 texelCoord){
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GbufferData data;
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vec4 gbuffer2 = texelFetch(colortex2, texelCoord, 0);
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vec4 gbuffer3 = texelFetch(colortex3, texelCoord, 0);
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data.albedo = GammaToLinear(texelFetch(colortex0, texelCoord, 0).rgb);
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data.albedoAlpha = 1.0;
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data.worldNormal = DecodeNormal(texelFetch(colortex1, texelCoord, 0).xy);
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data.vertexNormal = DecodeNormal(texelFetch(colortex1, texelCoord, 0).zw);
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data.lightmap = gbuffer3.xy;
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data.materialID = gbuffer2.a;
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data.parallaxShadow = gbuffer3.b;
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vec4 specTex = vec4(gbuffer2.r, gbuffer2.g, gbuffer2.b, 0.0);
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data.material = MaterialFromTex(specTex);
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return data;
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}
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// Read translucent GBuffer data
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GbufferData GetGbufferDataTranslucent(ivec2 texelCoord, out bool isSmooth){
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GbufferData data;
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vec4 gbuffer5 = texelFetch(colortex5, texelCoord, 0);
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vec4 gbuffer6 = texelFetch(colortex6, texelCoord, 0);
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data.worldNormal = DecodeNormal(gbuffer6.xy);
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data.vertexNormal = DecodeNormal(gbuffer6.zw);
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data.lightmap = texelFetch(colortex7, texelCoord, 0).xy;
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data.materialID = gbuffer6.a;
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data.parallaxShadow = 1.0;
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isSmooth = false;
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if (data.materialID == MATID_WATER){
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data.albedo = GammaToLinear(gbuffer5.rgb);
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data.albedoAlpha = gbuffer5.a;
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data.material = material_water;
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isSmooth = true;
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}else if (data.materialID == MATID_STAINEDGLASS){
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data.albedo = GammaToLinear(gbuffer5.rgb);
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data.albedoAlpha = gbuffer5.a;
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data.material = material_glass;
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isSmooth = true;
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}else if (data.materialID == MATID_PARTICLE){
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data.albedo = GammaToLinear(gbuffer5.rgb);
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data.albedoAlpha = gbuffer5.a;
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data.material = material_air;
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}else{
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data.albedo = GammaToLinear(texelFetch(colortex0, texelCoord, 0).rgb);
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data.albedoAlpha = 1.0;
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vec4 specTex = vec4(gbuffer2.r, gbuffer2.g, gbuffer2.b, 0.0);
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data.material = MaterialFromTex(specTex);
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}
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return data;
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}
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// Material mask utilities
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struct MaterialMask{
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float sky;
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float grass;
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float leaves;
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float hand;
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float entityPlayer;
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float water;
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float stainedGlass;
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float lightning;
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float entitiesSnow;
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float endrod;
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float fire;
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float torch;
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float lightSource;
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float redstoneTorch;
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float soulTorch;
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float amethyst;
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float particle;
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float endPortal;
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float selection;
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};
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MaterialMask CalculateMasks(float materialIDs){
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MaterialMask mask;
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mask.sky = float(materialIDs == MATID_SKY);
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mask.grass = float(materialIDs == MATID_GRASS || materialIDs == MATID_BEACON_BEAM);
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mask.leaves = float(materialIDs == MATID_LEAVES);
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mask.hand = float(materialIDs == MATID_HAND);
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mask.water = float(materialIDs == MATID_WATER);
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mask.stainedGlass = float(materialIDs == MATID_STAINEDGLASS);
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mask.entityPlayer = float(materialIDs == MATID_ENTITIES_PLAYER);
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mask.entitiesSnow = float(materialIDs == MATID_ENTITIES_SNOW || materialIDs == MATID_BEACON_BEAM);
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mask.lightning = float(materialIDs == MATID_LIGHTNING);
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mask.endrod = float(materialIDs == MATID_ENDROD);
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mask.fire = float(materialIDs == MATID_FIRE);
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mask.torch = float(materialIDs == MATID_TORCH);
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mask.redstoneTorch = float(materialIDs == MATID_REDSTONE_TORCH);
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mask.amethyst = float(materialIDs == MATID_AMETHYST);
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mask.soulTorch = float(materialIDs == MATID_SOULTORCH || materialIDs == MATID_COPPER_LANTERN);
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mask.particle = float(materialIDs == MATID_PARTICLE);
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mask.endPortal = float(materialIDs == MATID_END_PORTAL);
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mask.selection = float(materialIDs == MATID_SELECTION);
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return mask;
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}
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void ApplyMaterial(inout Material material, in MaterialMask materialMask, inout bool isSmooth){
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if (materialMask.water > 0.5){
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material = material_water;
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isSmooth = true;
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}else if (materialMask.stainedGlass > 0.5){
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material = material_glass;
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isSmooth = true;
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}
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}
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#endif
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