void NormalCompressorDXT1::compressBlock(ColorSet & set, nvtt::AlphaMode alphaMode, const nvtt::CompressionOptions::Private & compressionOptions, void * output)
{
set.setUniformWeights();
set.createMinimalSet(false);
ClusterFit fit;
fit.setMetric(compressionOptions.colorWeight);
BlockDXT1 * block = new(output) BlockDXT1;
if (set.isSingleColor(true))
{
Color32 c;
c.r = uint8(clamp(set.colors[0].x, 0.0f, 1.0f) * 255);
c.g = uint8(clamp(set.colors[0].y, 0.0f, 1.0f) * 255);
c.b = uint8(clamp(set.colors[0].z, 0.0f, 1.0f) * 255);
c.a = 255;
OptimalCompress::compressDXT1(c, block);
}
else
{
fit.setColourSet(&set);
Vector3 start, end;
fit.compress4(&start, &end);
QuickCompress::outputBlock4(set, start, end, block);
if (fit.compress3(&start, &end)) {
QuickCompress::outputBlock3(set, start, end, block);
}
}
}
void nv::compress_dxt1_cluster_fit(const Vector3 input_colors[16], const Vector3 * colors, const float * weights, int count, const Vector3 & color_weights, BlockDXT1 * output)
{
ClusterFit fit;
fit.setColorWeights(Vector4(color_weights, 1));
fit.setColorSet(colors, weights, count);
// start & end are in [0, 1] range.
Vector3 start, end;
fit.compress4(&start, &end);
if (fit.compress3(&start, &end)) {
output_block3(input_colors, color_weights, start, end, output);
}
else {
output_block4(input_colors, color_weights, start, end, output);
}
}
void Compress( u8 const* rgba, void* block, int flags )
{
// fix any bad flags
flags = FixFlags( flags );
// get the block locations
void* colourBlock = block;
void* alphaBock = block;
if( ( flags & ( kDxt3 | kDxt5 ) ) != 0 )
colourBlock = reinterpret_cast< u8* >( block ) + 8;
// create the minimal point set
ColourSet colours( rgba, flags );
// check the compression type and compress colour
if( colours.GetCount() == 1 )
{
// always do a single colour fit
SingleColourFit fit;
fit.SetColourSet( &colours, flags );
fit.Compress( colourBlock );
}
else if( ( flags & kColourRangeFit ) != 0 )
{
// do a range fit
RangeFit fit;
fit.SetColourSet( &colours, flags );
fit.Compress( colourBlock );
}
else
{
// default to a cluster fit
ClusterFit fit;
fit.SetColourSet( &colours, flags );
fit.SetMetric( 1.0f, 1.0f, 1.0f );
fit.Compress( colourBlock );
}
// compress alpha separately if necessary
if( ( flags & kDxt3 ) != 0 )
CompressAlphaDxt3( rgba, alphaBock );
else if( ( flags & kDxt5 ) != 0 )
CompressAlphaDxt5( rgba, alphaBock );
}
