Function CompressNormalMap3Dc

trinity/Tr2DxtCompressor.cpp:795–830

}

void CompressNormalMap3Dc( const uint8_t* inBuf, uint8_t* outBuf, int width, int height, ptrdiff_t& outputBytes, volatile const bool& cancel )
{
	uint8_t block[64];
	uint8_t normalMin[4];
	uint8_t normalMax[4];

	uint8_t** outData = &outBuf;

	for( int j = 0; j < height; j += 4, inBuf += width * 4 * 4 )
	{
		if( cancel )
		{
			return;
		}
		for( int i = 0; i < width; i += 4 )
		{

			ExtractBlock( inBuf + i * 4, width, block );

			GetMinMaxNormalsBBox( block, normalMin, normalMax );
			InsetNormalsBBox3Dc( normalMin, normalMax );

			// Write out Nx as an alpha channel.
			EmitByte( normalMax[0], outData );
			EmitByte( normalMin[0], outData );
			EmitAlphaIndicesForNormals( block, 0, normalMin[0], normalMax[0], outData );

			// Write out Ny as an alpha channel.
			EmitByte( normalMax[1], outData );
			EmitByte( normalMin[1], outData );
			EmitAlphaIndicesForNormals( block, 1, normalMin[1], normalMax[1], outData );
		}
	}

	outputBytes = *outData - outBuf;
}

bool Tr2DxtCompressSurface( Tr2DxtCompressionFormat eCompressFmt,
							const uint8_t* inBuf,