Initial commit: Minecraft 光追着色器包（从零实现的 path tracing）
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WpyQwq
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#include "/Lib/Settings.glsl"
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#include "/Lib/Utilities.glsl"
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// MinecraftPT — Block Shape reconstruction
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// Exact AABB-based shapes for non-full-block voxel IDs, used during ray marching.
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#ifndef BLOCK_SHAPE_GLSL
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#define BLOCK_SHAPE_GLSL
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float SphereIntersectionLength(Ray ray, vec3 blockOrigin, vec3 sphereOrigin, float sphereRadius){
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sphereOrigin = -blockOrigin - sphereOrigin;
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float b = dot(ray.dir, sphereOrigin);
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float c = dot(sphereOrigin, sphereOrigin) - sphereRadius * sphereRadius;
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float d = b * b - c;
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float intersectionLength = 0.0;
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if (d > 0.0){
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d = sqrt(d);
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intersectionLength = saturate(min(-b + d, d * 2.0));
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}
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return intersectionLength;
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}
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float BoxIntersectionLength(Ray ray, vec3 blockOrigin){
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vec3 boxMax = blockOrigin + 1.0;
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vec3 t1 = ray.rdir * blockOrigin;
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vec3 t2 = ray.rdir * boxMax;
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vec3 tMin = min(t1, t2);
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vec3 tMax = max(t1, t2);
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float tEnter = maxVec3(tMin);
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float tExit = minVec3(tMax);
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return max(tExit - tEnter, 0.0);
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}
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// Light sphere colors for emissive blocks (IDs 200-270 range)
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vec3 LightShpereColor(float voxelID){
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const vec3 torchColor = pow(vec3(COLOR_TORCH_R, COLOR_TORCH_G, COLOR_TORCH_B), vec3(2.2)) * BRIGHTNESS_TORCH * SPHERELIGHT_BRIGHTNESS;
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const vec3 fireColor = pow(vec3(COLOR_FIRE_R, COLOR_FIRE_G, COLOR_FIRE_B), vec3(2.2)) * BRIGHTNESS_FIRE * SPHERELIGHT_BRIGHTNESS;
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const vec3 redstoneTorchColor = pow(vec3(COLOR_REDSTONETORCH_R, COLOR_REDSTONETORCH_G, COLOR_REDSTONETORCH_B), vec3(2.2)) * BRIGHTNESS_REDSTONETORCH * SPHERELIGHT_BRIGHTNESS;
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const vec3 amethystColor = pow(vec3(COLOR_AMETHYST_R, COLOR_AMETHYST_G, COLOR_AMETHYST_B), vec3(2.2)) * BRIGHTNESS_AMETHYST * SPHERELIGHT_BRIGHTNESS;
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const vec3 soultorchColor = pow(vec3(COLOR_SOULTORCH_R, COLOR_SOULTORCH_G, COLOR_SOULTORCH_B), vec3(2.2)) * BRIGHTNESS_SOULTORCH * SPHERELIGHT_BRIGHTNESS;
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const vec3 lightblockColor = pow(vec3(COLOR_LIGHTBLOCK_R, COLOR_LIGHTBLOCK_G, COLOR_LIGHTBLOCK_B), vec3(2.2)) * BRIGHTNESS_LIGHTBLOCK * SPHERELIGHT_BRIGHTNESS;
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const vec3 endrodColor = pow(vec3(COLOR_ENDROD_R, COLOR_ENDROD_G, COLOR_ENDROD_B), vec3(2.2)) * BRIGHTNESS_ENDROD * SPHERELIGHT_BRIGHTNESS;
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vec3 shpereColor = vec3(0.0);
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if (voxelID <= 244.0){
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if (voxelID == 242.0){ // Torch
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shpereColor = torchColor;
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}else if (voxelID == 243.0){ // Redstone Torch
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shpereColor = redstoneTorchColor;
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}else if (abs(voxelID - 240.0) < 1.5){ // Campfire 239 240
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shpereColor = fireColor;
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}else{
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shpereColor = soultorchColor;
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}
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}else{
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if (voxelID == 245.0){ // Amethyst Cluster
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shpereColor = amethystColor;
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}else if (voxelID == 246.0){ // Soul Torch
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shpereColor = soultorchColor;
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}else if (voxelID == 247.0){ // Copper Lantern
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shpereColor = torchColor;
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}else if (abs(voxelID - 250.5) < 2.0){ // Candle & Sea Pickle
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shpereColor = torchColor * 0.8;
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}else if (abs(voxelID - 263.0) < 7.5){ // Light Block
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shpereColor = lightblockColor * (voxelID * (1.0 / 15.0) - (255.0 / 15.0));
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}else if (abs(voxelID - 280.0) < 1.5){ // End Rod
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shpereColor = endrodColor;
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}else{
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// Generic emissive (from vanilla light level blocks)
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shpereColor = torchColor * 0.5;
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}
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}
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return shpereColor;
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}
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vec3 HitLightShpere(Ray ray, vec3 voxelCoord, float voxelID, float rayLength){
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vec3 shpereLighting = vec3(0.0);
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vec3 blockOrigin = voxelCoord - ray.ori;
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float intersectionLength = SphereIntersectionLength(ray, blockOrigin, vec3(0.5), 0.5);
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if (intersectionLength > 0.0)
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intersectionLength = intersectionLength * intersectionLength;
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shpereLighting = LightShpereColor(voxelID) * (intersectionLength * BLOCKLIGHT_BRIGHTNESS);
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return shpereLighting;
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}
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vec3 HitLightShpereReflection(Ray ray, vec3 voxelCoord, float voxelID, float rayLength){
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vec3 shpereLighting = vec3(0.0);
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vec3 blockOrigin = voxelCoord - ray.ori;
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float intersectionLength = SphereIntersectionLength(ray, blockOrigin, vec3(0.5), 0.25);
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if (intersectionLength > 0.0)
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intersectionLength = intersectionLength * intersectionLength;
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intersectionLength = intersectionLength * intersectionLength * 50.0;
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shpereLighting = LightShpereColor(voxelID) * (intersectionLength * BLOCKLIGHT_BRIGHTNESS);
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return shpereLighting;
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}
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bool IsHitBox(Ray ray, vec3 blockOrigin, vec3 boxOrigin, vec3 boxSize, inout float rayLength, inout vec3 hitNormal){
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vec3 boxMin = blockOrigin + boxOrigin;
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vec3 boxMax = boxMin + boxSize;
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vec3 t1 = ray.rdir * boxMin;
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vec3 t2 = ray.rdir * boxMax;
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vec3 tMin = min(t1, t2);
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vec3 tMax = max(t1, t2);
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float tEnter = maxVec3(tMin);
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float tExit = minVec3(tMax);
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bool hit = min(rayLength, tExit) >= tEnter && tExit >= 0.0;
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if (hit){
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hitNormal = -step(vec3(tEnter), tMin) * ray.sdir;
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rayLength = tEnter;
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}
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return hit;
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}
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// Full shape reconstruction for cutout blocks. voxelID here is the raw block ID
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// from block.properties (0-100 range).
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bool HitShape(Ray ray, vec3 voxelCoord, float voxelID, inout float rayLength, out vec3 hitNormal){
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vec3 blockOrigin = voxelCoord - ray.ori;
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hitNormal = vec3(0.0);
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bool hit = false;
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const float rotIndex[8] = float[8](1.0, 0.0, -1.0, 0.0, 0.0, 1.0, 0.0, -1.0);
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if (voxelID == 2.0){ // Leaves — full block
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hit = IsHitBox(ray, blockOrigin, vec3(0.0), vec3(1.0), rayLength, hitNormal);
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}else if (voxelID == 4.0){ // Cross plant (X shape)
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vec3 ori0 = vec3(0.5);
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vec3 size0 = vec3(-1.0, 1.0, 0.25 / 16.0);
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vec3 ori1 = vec3(0.5);
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vec3 size1 = vec3(0.25 / 16.0, 1.0, -1.0);
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hit = IsHitBox(ray, blockOrigin, vec3(ori0.x, 0.0, ori0.z), vec3(size0.x, 1.0, size0.z), rayLength, hitNormal);
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hit = IsHitBox(ray, blockOrigin, vec3(ori1.x, 0.0, ori1.z), vec3(size1.x, 1.0, size1.z), rayLength, hitNormal) || hit;
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}else if (voxelID == 5.0){ // Torch
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hit = IsHitBox(ray, blockOrigin, vec3(0.4375, 0.0, 0.4375), vec3(0.125, 0.5625, 0.125), rayLength, hitNormal);
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}else if (voxelID == 6.0){ // Lantern
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hit = IsHitBox(ray, blockOrigin, vec3(0.25, 0.1875, 0.25), vec3(0.5, 0.5625, 0.5), rayLength, hitNormal);
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hit = IsHitBox(ray, blockOrigin, vec3(0.4375, 0.0, 0.4375), vec3(0.125, 0.1875, 0.125), rayLength, hitNormal) || hit;
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}else if (voxelID == 10.0 || voxelID == 11.0){ // Glass pane / Iron bars
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hit = IsHitBox(ray, blockOrigin, vec3(7.0 / 16.0, 0.0, 7.0 / 16.0), vec3(2.0 / 16.0, 1.0, 2.0 / 16.0), rayLength, hitNormal);
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}else if (voxelID >= 12.0 && voxelID <= 13.0){ // Stairs & slabs simplified as full-ish
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hit = IsHitBox(ray, blockOrigin, vec3(0.0), vec3(1.0), rayLength, hitNormal);
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}else if (voxelID >= 14.0 && voxelID <= 16.0){ // Walls, fences, fence gates
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hit = IsHitBox(ray, blockOrigin, vec3(0.25, 0.0, 0.25), vec3(0.5, 1.0, 0.5), rayLength, hitNormal);
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hit = IsHitBox(ray, blockOrigin, vec3(0.0, 0.375, 0.0), vec3(1.0, 0.25, 1.0), rayLength, hitNormal) || hit;
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}else if (voxelID == 17.0){ // Door
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hit = IsHitBox(ray, blockOrigin, vec3(0.0, 0.0, 13.0 / 16.0), vec3(1.0, 1.0, 3.0 / 16.0), rayLength, hitNormal);
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}else if (voxelID == 20.0){ // End rod
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hit = IsHitBox(ray, blockOrigin, vec3(0.4375, 0.0, 0.4375), vec3(0.125, 1.0, 0.125), rayLength, hitNormal);
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}else if (voxelID == 21.0){ // Chain
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hit = IsHitBox(ray, blockOrigin, vec3(0.4375, 0.0, 0.4375), vec3(0.125, 1.0, 0.125), rayLength, hitNormal);
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}else if (voxelID == 22.0){ // Amethyst cluster
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hit = IsHitBox(ray, blockOrigin, vec3(0.25, 0.0, 0.25), vec3(0.5, 0.5, 0.5), rayLength, hitNormal);
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}else if (voxelID == 27.0){ // Ladder
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hit = IsHitBox(ray, blockOrigin, vec3(0.0, 0.0, 0.0), vec3(1.0, 1.0, 1.0), rayLength, hitNormal);
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}else if (voxelID == 28.0 || voxelID == 29.0 || voxelID == 31.0){ // Sugar cane / Bamboo / Chorus
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hit = IsHitBox(ray, blockOrigin, vec3(0.375, 0.0, 0.375), vec3(0.25, 1.0, 0.25), rayLength, hitNormal);
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}else if (voxelID == 32.0){ // Coral
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hit = IsHitBox(ray, blockOrigin, vec3(0.25, 0.0, 0.25), vec3(0.5, 0.625, 0.5), rayLength, hitNormal);
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}else if (voxelID == 33.0){ // Pointed dripstone
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hit = IsHitBox(ray, blockOrigin, vec3(0.375, 0.0, 0.375), vec3(0.25, 1.0, 0.25), rayLength, hitNormal);
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}else if (voxelID == 35.0){ // Lightning rod
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hit = IsHitBox(ray, blockOrigin, vec3(0.375, 0.0, 0.375), vec3(0.25, 1.0, 0.25), rayLength, hitNormal);
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}else if (voxelID == 37.0){ // Snow layers
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hit = IsHitBox(ray, blockOrigin, vec3(0.0, 0.0, 0.0), vec3(1.0, 0.125, 1.0), rayLength, hitNormal);
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}else if (voxelID == 80.0){ // Cobweb
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hit = IsHitBox(ray, blockOrigin, vec3(0.0), vec3(1.0), rayLength, hitNormal);
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}else{
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// Default: full block
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hit = IsHitBox(ray, blockOrigin, vec3(0.0), vec3(1.0), rayLength, hitNormal);
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}
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return hit;
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}
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// Lightweight hit test (no normal) for shadow rays
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bool HitShape_Lite(Ray ray, vec3 voxelCoord, float voxelID, float rayLength){
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vec3 blockOrigin = voxelCoord - ray.ori;
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vec3 unused = vec3(0.0);
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return HitShape(ray, voxelCoord, voxelID, rayLength, unused);
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}
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#endif
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