96 lines
No EOL
2.6 KiB
GLSL
96 lines
No EOL
2.6 KiB
GLSL
#version 460
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layout(local_size_x = 4, local_size_y = 4, local_size_z = 4) in;
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const int CHUNK_SIZE = 16;
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const int CHUNK_AREA = CHUNK_SIZE * CHUNK_SIZE;
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const int VOXEL_COUNT = CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE;
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const uint VERTICES_PER_FACE = 6u;
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const uint MAX_VISIBLE_FACES_PER_CHUNK = uint(CHUNK_SIZE * CHUNK_SIZE * CHUNK_SIZE * 6);
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layout(std430, binding = 0) readonly buffer VoxelData {
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uint voxels[];
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};
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layout(std430, binding = 1) buffer FaceBuffer {
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uint faces[];
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};
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struct DrawCommand {
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uint vertexCount;
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uint instanceCount;
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uint firstVertex;
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uint firstInstance;
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};
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layout(std430, binding = 2) buffer DrawCommands {
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DrawCommand drawCmds[];
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};
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layout(std430, binding = 3) buffer Counters {
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uint faceCount;
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} counters;
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layout(push_constant) uniform ChunkInfo {
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ivec3 chunkPos;
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int slot;
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uint faceOffset;
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uint unused0;
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uint indirectCommandIndex;
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uint padding0;
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};
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uint flatten(ivec3 pos) {
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return uint((pos.x * CHUNK_AREA) + (pos.y * CHUNK_SIZE) + pos.z);
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}
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uint getVoxel(ivec3 pos) {
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if (pos.x < 0 || pos.x >= CHUNK_SIZE) return 0u;
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if (pos.y < 0 || pos.y >= CHUNK_SIZE) return 0u;
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if (pos.z < 0 || pos.z >= CHUNK_SIZE) return 0u;
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return voxels[flatten(pos)];
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}
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uint packFace(uvec3 voxelPos, uint faceIndex, uint materialId, uint ao) {
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return (voxelPos.x & 0x1Fu) |
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((voxelPos.y & 0x1Fu) << 5u) |
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((voxelPos.z & 0x1Fu) << 10u) |
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((faceIndex & 0x7u) << 15u) |
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((materialId & 0xFFu) << 18u) |
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((ao & 0x3u) << 26u);
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}
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void emitFace(ivec3 voxelPos, uint faceIndex, uint voxelType) {
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uint localFace = atomicAdd(counters.faceCount, 1u);
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if (localFace >= MAX_VISIBLE_FACES_PER_CHUNK) {
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return;
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}
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faces[faceOffset + localFace] = packFace(uvec3(voxelPos), faceIndex, voxelType, 0u);
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atomicAdd(drawCmds[indirectCommandIndex].vertexCount, VERTICES_PER_FACE);
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}
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void main() {
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ivec3 pos = ivec3(gl_GlobalInvocationID.xyz);
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if (pos.x >= CHUNK_SIZE || pos.y >= CHUNK_SIZE || pos.z >= CHUNK_SIZE) {
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return;
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}
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uint current = getVoxel(pos);
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if (current == 0u) {
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return;
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}
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if (getVoxel(pos + ivec3( 0, 1, 0)) == 0u) emitFace(pos, 0u, current);
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if (getVoxel(pos + ivec3( 0, -1, 0)) == 0u) emitFace(pos, 1u, current);
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if (getVoxel(pos + ivec3( 1, 0, 0)) == 0u) emitFace(pos, 2u, current);
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if (getVoxel(pos + ivec3(-1, 0, 0)) == 0u) emitFace(pos, 3u, current);
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if (getVoxel(pos + ivec3( 0, 0, 1)) == 0u) emitFace(pos, 4u, current);
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if (getVoxel(pos + ivec3( 0, 0, -1)) == 0u) emitFace(pos, 5u, current);
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} |