bool ChunkMesh::isAirNearBlockFace(const ChunkData & chunkData, int blockX, int blockY, int blockZ, BlockFace face)
{
switch(face)
{
case BlockFace::North:
return blockZ == 0 || chunkData.getBlock(blockX, blockY, blockZ - 1) == 0;
case BlockFace::South:
return blockZ == chunkData.getZSize() - 1 || chunkData.getBlock(blockX, blockY, blockZ + 1) == 0;
case BlockFace::West:
return blockX == 0 || chunkData.getBlock(blockX - 1, blockY, blockZ) == 0;
case BlockFace::East:
return blockX == chunkData.getXSize() - 1 || chunkData.getBlock(blockX + 1, blockY, blockZ) == 0;
case BlockFace::Bottom:
return blockY == 0 || chunkData.getBlock(blockX, blockY - 1, blockZ) == 0;
case BlockFace::Top:
return blockY == chunkData.getYSize() - 1 || chunkData.getBlock(blockX, blockY + 1, blockZ) == 0;
default:
return false;
}
}
ChunkMesh ChunkMesh::createFromChunkData(const ChunkData & chunkData)
{
ChunkMesh mesh;
mesh.m_isValid = true;
unsigned int indicesOffset = 0;
for(int y = 0; y < chunkData.getYSize(); ++y)
{
for(int z = 0; z < chunkData.getZSize(); ++z)
{
for(int x = 0; x < chunkData.getXSize(); ++x)
{
const int blockCode = chunkData.getBlock(x, y, z);
if(blockCode != 0)
{
if(isAirNearBlockFace(chunkData, x, y, z, BlockFace::North))
{
mesh.m_vertices.insert(
mesh.m_vertices.end(),
{
1.0f + x, 0.0f + y, 0.0f + z, 0.0f, 0.0f,
0.0f + x, 0.0f + y, 0.0f + z, 0.0f, 1.0f,
0.0f + x, 1.0f + y, 0.0f + z, 1.0f, 1.0f,
1.0f + x, 1.0f + y, 0.0f + z, 1.0f, 0.0f
}
);
mesh.m_indices.insert(
mesh.m_indices.end(),
{
0 + indicesOffset, 1 + indicesOffset, 2 + indicesOffset,
0 + indicesOffset, 2 + indicesOffset, 3 + indicesOffset
}
);
indicesOffset += 4;
}
if(isAirNearBlockFace(chunkData, x, y, z, BlockFace::South))
{
mesh.m_vertices.insert(
mesh.m_vertices.end(),
{
0.0f + x, 0.0f + y, 1.0f + z, 0.0f, 0.0f,
0.0f + x, 1.0f + y, 1.0f + z, 0.0f, 1.0f,
1.0f + x, 1.0f + y, 1.0f + z, 1.0f, 1.0f,
1.0f + x, 0.0f + y, 1.0f + z, 1.0f, 0.0f
}
);
mesh.m_indices.insert(
mesh.m_indices.end(),
{
0 + indicesOffset, 1 + indicesOffset, 2 + indicesOffset,
0 + indicesOffset, 2 + indicesOffset, 3 + indicesOffset
}
);
indicesOffset += 4;
}
if(isAirNearBlockFace(chunkData, x, y, z, BlockFace::West))
{
mesh.m_vertices.insert(
mesh.m_vertices.end(),
{
0.0f + x, 0.0f + y, 0.0f + z, 0.0f, 0.0f,
0.0f + x, 1.0f + y, 0.0f + z, 0.0f, 1.0f,
0.0f + x, 1.0f + y, 1.0f + z, 1.0f, 1.0f,
0.0f + x, 0.0f + y, 1.0f + z, 1.0f, 0.0f
}
);
mesh.m_indices.insert(
mesh.m_indices.end(),
{
0 + indicesOffset, 1 + indicesOffset, 2 + indicesOffset,
0 + indicesOffset, 2 + indicesOffset, 3 + indicesOffset
}
);
indicesOffset += 4;
}
if(isAirNearBlockFace(chunkData, x, y, z, BlockFace::East))
{
mesh.m_vertices.insert(
mesh.m_vertices.end(),
{
1.0f + x, 0.0f + y, 1.0f + z, 0.0f, 0.0f,
1.0f + x, 1.0f + y, 1.0f + z, 0.0f, 1.0f,
1.0f + x, 1.0f + y, 0.0f + z, 1.0f, 1.0f,
1.0f + x, 0.0f + y, 0.0f + z, 1.0f, 0.0f
}
);
mesh.m_indices.insert(
mesh.m_indices.end(),
{
0 + indicesOffset, 1 + indicesOffset, 2 + indicesOffset,
0 + indicesOffset, 2 + indicesOffset, 3 + indicesOffset
}
);
indicesOffset += 4;
}
if(isAirNearBlockFace(chunkData, x, y, z, BlockFace::Bottom))
{
mesh.m_vertices.insert(
mesh.m_vertices.end(),
{
0.0f + x, 0.0f + y, 0.0f + z, 0.0f, 0.0f,
0.0f + x, 0.0f + y, 1.0f + z, 0.0f, 1.0f,
1.0f + x, 0.0f + y, 1.0f + z, 1.0f, 1.0f,
1.0f + x, 0.0f + y, 0.0f + z, 1.0f, 0.0f
}
);
mesh.m_indices.insert(
mesh.m_indices.end(),
{
0 + indicesOffset, 1 + indicesOffset, 2 + indicesOffset,
0 + indicesOffset, 2 + indicesOffset, 3 + indicesOffset
}
);
indicesOffset += 4;
}
if(isAirNearBlockFace(chunkData, x, y, z, BlockFace::Top))
{
mesh.m_vertices.insert(
mesh.m_vertices.end(),
{
0.0f + x, 1.0f + y, 1.0f + z, 0.0f, 0.0f,
0.0f + x, 1.0f + y, 0.0f + z, 0.0f, 1.0f,
1.0f + x, 1.0f + y, 0.0f + z, 1.0f, 1.0f,
1.0f + x, 1.0f + y, 1.0f + z, 1.0f, 0.0f
}
);
mesh.m_indices.insert(
mesh.m_indices.end(),
{
0 + indicesOffset, 1 + indicesOffset, 2 + indicesOffset,
0 + indicesOffset, 2 + indicesOffset, 3 + indicesOffset
}
);
indicesOffset += 4;
}
}
}
}
}
return mesh;
}