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Optimize scalar DXT1 compression.

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This commit is contained in:
Bartosz Taudul 2020-02-15 13:43:40 +01:00
parent b4d8cdd714
commit 0b82902618
1 changed files with 7 additions and 6 deletions
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13
client/TracyDxt1.cpp
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@ -453,19 +453,20 @@ static tracy_force_inline uint64_t ProcessRGB( const uint8_t* src )
return uint64_t( ( uint64_t( to565( vmin ) ) << 16 ) | to565( vmax ) | ( uint64_t( vp ) << 32 ) );
# endif
#else
const auto ref = to565( src[0], src[1], src[2] );
uint32_t ref;
memcpy( &ref, src, 4 );
uint32_t refMask = ref & 0xF8FCF8;
auto stmp = src + 4;
for( int i=1; i<16; i++ )
{
if( to565( stmp[0], stmp[1], stmp[2] ) != ref )
{
break;
}
uint32_t px;
memcpy( &px, stmp, 4 );
if( ( px & 0xF8FCF8 ) != refMask ) break;
stmp += 4;
}
if( stmp == src + 64 )
{
return uint64_t( ref ) << 16;
return uint64_t( to565( ref ) ) << 16;
}
uint8_t min[3] = { src[0], src[1], src[2] };