Function EmitColorIndices

trinity/Tr2DxtCompressor.cpp:421–457

}

void EmitColorIndices( const uint8_t* colorBlock, const uint8_t* minColor, const uint8_t* maxColor, uint8_t** outBuff )
{
	word colors[4][4];
	dword result = 0;
	colors[0][0] = ( maxColor[0] & C565_5_MASK ) | ( maxColor[0] >> 5 );
	colors[0][1] = ( maxColor[1] & C565_6_MASK ) | ( maxColor[1] >> 6 );
	colors[0][2] = ( maxColor[2] & C565_5_MASK ) | ( maxColor[2] >> 5 );
	colors[1][0] = ( minColor[0] & C565_5_MASK ) | ( minColor[0] >> 5 );
	colors[1][1] = ( minColor[1] & C565_6_MASK ) | ( minColor[1] >> 6 );
	colors[1][2] = ( minColor[2] & C565_5_MASK ) | ( minColor[2] >> 5 );
	colors[2][0] = ( 2 * colors[0][0] + 1 * colors[1][0] ) / 3;
	colors[2][1] = ( 2 * colors[0][1] + 1 * colors[1][1] ) / 3;
	colors[2][2] = ( 2 * colors[0][2] + 1 * colors[1][2] ) / 3;
	colors[3][0] = ( 1 * colors[0][0] + 2 * colors[1][0] ) / 3;
	colors[3][1] = ( 1 * colors[0][1] + 2 * colors[1][1] ) / 3;
	colors[3][2] = ( 1 * colors[0][2] + 2 * colors[1][2] ) / 3;
	for( int i = 15; i >= 0; i-- )
	{
		int c0 = colorBlock[i * 4 + 0];
		int c1 = colorBlock[i * 4 + 1];
		int c2 = colorBlock[i * 4 + 2];
		int d0 = abs( colors[0][0] - c0 ) + abs( colors[0][1] - c1 ) + abs( colors[0][2] - c2 );
		int d1 = abs( colors[1][0] - c0 ) + abs( colors[1][1] - c1 ) + abs( colors[1][2] - c2 );
		int d2 = abs( colors[2][0] - c0 ) + abs( colors[2][1] - c1 ) + abs( colors[2][2] - c2 );
		int d3 = abs( colors[3][0] - c0 ) + abs( colors[3][1] - c1 ) + abs( colors[3][2] - c2 );
		int b0 = d0 > d3;
		int b1 = d1 > d2;
		int b2 = d0 > d2;
		int b3 = d1 > d3;
		int b4 = d2 > d3;
		int x0 = b1 & b2;
		int x1 = b0 & b3;
		int x2 = b0 & b4;
		result |= ( x2 | ( ( x0 | x1 ) << 1 ) ) << ( i << 1 );
	}
	EmitDoubleWord( result, outBuff );
}
void GetMinMaxNormalsBBox( const uint8_t* block, uint8_t* minNormal, uint8_t* maxNormal )
{