Method WriteBlockArea

src/Chunk.cpp:353–400

void cChunk::WriteBlockArea(cBlockArea & a_Area, int a_MinBlockX, int a_MinBlockY, int a_MinBlockZ, int a_DataTypes)
{
	if ((a_DataTypes & (cBlockArea::baTypes | cBlockArea::baMetas)) != (cBlockArea::baTypes | cBlockArea::baMetas))
	{
		LOGWARNING("cChunk::WriteBlockArea(): unsupported datatype request, can write only types + metas (0x%x), requested 0x%x. Ignoring.",
			(cBlockArea::baTypes | cBlockArea::baMetas), a_DataTypes & (cBlockArea::baTypes | cBlockArea::baMetas)
		);
		return;
	}
	
	// SizeX, SizeZ are the dimensions of the block data to copy to the chunk (size of the geometric union)

	int BlockStartX = std::max(a_MinBlockX, m_PosX * cChunkDef::Width);
	int BlockEndX   = std::min(a_MinBlockX + a_Area.GetSizeX(), (m_PosX + 1) * cChunkDef::Width);
	int BlockStartZ = std::max(a_MinBlockZ, m_PosZ * cChunkDef::Width);
	int BlockEndZ   = std::min(a_MinBlockZ + a_Area.GetSizeZ(), (m_PosZ + 1) * cChunkDef::Width);
	int SizeX = BlockEndX - BlockStartX;
	int SizeZ = BlockEndZ - BlockStartZ;
	int OffX = BlockStartX - m_PosX * cChunkDef::Width;
	int OffZ = BlockStartZ - m_PosZ * cChunkDef::Width;
	int BaseX = BlockStartX - a_MinBlockX;
	int BaseZ = BlockStartZ - a_MinBlockZ;
	int SizeY = a_Area.GetSizeY();

	// TODO: Improve this by not calling FastSetBlock() and doing the processing here
	// so that the heightmap is touched only once for each column.
	BLOCKTYPE *  AreaBlockTypes = a_Area.GetBlockTypes();
	NIBBLETYPE * AreaBlockMetas = a_Area.GetBlockMetas();
	for (int y = 0; y < SizeY; y++)
	{
		int ChunkY = a_MinBlockY + y;
		int AreaY = y;
		for (int z = 0; z < SizeZ; z++)
		{
			int ChunkZ = OffZ + z;
			int AreaZ = BaseZ + z;
			for (int x = 0; x < SizeX; x++)
			{
				int ChunkX = OffX + x;
				int AreaX = BaseX + x;
				int idx = a_Area.MakeIndex(AreaX, AreaY, AreaZ);
				BLOCKTYPE BlockType = AreaBlockTypes[idx];
				NIBBLETYPE BlockMeta = AreaBlockMetas[idx];
				FastSetBlock(ChunkX, ChunkY, ChunkZ, BlockType, BlockMeta);
			}  // for x
		}  // for z
	}  // for y
}