halbear/Terrain4J_Experimental_branch
halbear/Terrain4J_Experimental_branch
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voxel texture mapping

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Halbear 2026-09-17 21:48:04 +01:00
parent 4565188f15
commit 0074bf1d1f
7 changed files with 165 additions and 77 deletions
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88
resources/EngineResources/VoxelComputeShaders/meshGenerationShared.glsl
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@ -52,14 +52,68 @@ uint getVoxel(ivec3 pos) {
return voxels[flatten(pos)];
}
uint hash21(uvec2 p) {
p = p * 1664525u + 1013904223u;
p.x += p.y * 1664525u;
p.y += p.x * 1664525u;
return p.x ^ (p.x >> 16);
}
uint packFace(uvec3 voxelPos, uint faceIndex, uint materialId, uint ao) {
return (voxelPos.x & 0x1Fu) |
((voxelPos.y & 0x1Fu) << 5u) |
((voxelPos.z & 0x1Fu) << 10u) |
((faceIndex & 0x7u) << 15u) |
((materialId & 0xFFu) << 18u) |
((ao & 0x3u) << 26u);
uint random_1_to_3(vec2 uv, uint customSeed) {
uvec2 p = uvec2(floatBitsToUint(uv.x), floatBitsToUint(uv.y));
p.x ^= customSeed;
uint randInt = hash21(p);
return (randInt % 3u) + 1u;
}
uint packFace(uvec3 voxelPos, uint faceIndex, uint materialId) {
uint randomFaceValue = random_1_to_3(vec2(voxelPos.x, voxelPos.z),faceOffset);
uint textureIndexX = 0u;
uint textureIndexY = 0u;
if(materialId == 1u){
if(faceIndex == 0u){
textureIndexX = 0u;
textureIndexY = randomFaceValue;
} else if(faceIndex == 1u){
textureIndexX = 1u;
textureIndexY = 0u;
}
else{
textureIndexX = 0u;
textureIndexY = 0u;
}
} else if(materialId == 2u){
textureIndexX = 1u;
textureIndexY = 0u;
}else if(materialId == 3u){
textureIndexX = 1u;
textureIndexY = 0u;
}else if(materialId == 4u){
textureIndexX = 1u;
textureIndexY = randomFaceValue;
}else if(materialId == 5u){
textureIndexX = 2u;
textureIndexY = 3u;
}else if(materialId == 5u){
if (faceIndex == 0u || faceIndex == 1u){
textureIndexX = 2u;
textureIndexY = 1u;
} else{
textureIndexX = 2u;
textureIndexY = 2u;
}
}else if(materialId == 6u){
textureIndexX = 2u;
textureIndexY = 0u;
}
return (voxelPos.x & 0x1Fu) |
((voxelPos.y & 0x1Fu) << 5u) |
((voxelPos.z & 0x1Fu) << 10u) |
((faceIndex & 0x7u) << 15u) |
((materialId & 0xFFu) << 18u) |
((textureIndexX & 0x7u) << 26u) |
((textureIndexY & 0x7u) << 29u);
}
void emitFace(ivec3 voxelPos, uint faceIndex, uint voxelType) {
@ -69,7 +123,7 @@ void emitFace(ivec3 voxelPos, uint faceIndex, uint voxelType) {
return;
}
faces[faceOffset + localFace] = packFace(uvec3(voxelPos), faceIndex, voxelType, 0u);
faces[faceOffset + localFace] = packFace(uvec3(voxelPos), faceIndex, voxelType);
atomicAdd(drawCmds[indirectCommandIndex].vertexCount, VERTICES_PER_FACE);
}
@ -87,10 +141,16 @@ void main() {
return;
}
if (getVoxel(pos + ivec3( 0, 1, 0)) == 0u) emitFace(pos, 0u, current);
if (getVoxel(pos + ivec3( 0, -1, 0)) == 0u) emitFace(pos, 1u, current);
if (getVoxel(pos + ivec3( 1, 0, 0)) == 0u) emitFace(pos, 2u, current);
if (getVoxel(pos + ivec3(-1, 0, 0)) == 0u) emitFace(pos, 3u, current);
if (getVoxel(pos + ivec3( 0, 0, 1)) == 0u) emitFace(pos, 4u, current);
if (getVoxel(pos + ivec3( 0, 0, -1)) == 0u) emitFace(pos, 5u, current);
if (current == 4u) {
emitFace(pos, 6u, current);
emitFace(pos, 7u, current);
return;
}
if (getVoxel(pos + ivec3( 0, 1, 0)) == 0u || getVoxel(pos + ivec3( 0, 1, 0)) == 4u) emitFace(pos, 0u, current);
if (getVoxel(pos + ivec3( 0, -1, 0)) == 0u || getVoxel(pos + ivec3( 0, -1, 0)) == 4u) emitFace(pos, 1u, current);
if (getVoxel(pos + ivec3( 1, 0, 0)) == 0u || getVoxel(pos + ivec3( 1, 0, 0)) == 4u) emitFace(pos, 2u, current);
if (getVoxel(pos + ivec3(-1, 0, 0)) == 0u || getVoxel(pos + ivec3( -1, 0, 0)) == 4u) emitFace(pos, 3u, current);
if (getVoxel(pos + ivec3( 0, 0, 1)) == 0u|| getVoxel(pos + ivec3( 0, 0, 1)) == 4u) emitFace(pos, 4u, current);
if (getVoxel(pos + ivec3( 0, 0, -1)) == 0u || getVoxel(pos + ivec3( 0, 0, -1)) == 4u) emitFace(pos, 5u, current);
}