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texturec: Added BC4/5 compression.

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This commit is contained in:
Branimir Karadžić
2015-12-22 15:40:55 -08:00
parent 1a96194429
commit c82d3e86d9
5 changed files with 124 additions and 67 deletions
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46
3rdparty/libsquish/squish.cpp vendored
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@@ -37,13 +37,18 @@ namespace squish {
static int FixFlags( int flags )
{
// grab the flag bits
int method = flags & ( kDxt1 | kDxt3 | kDxt5 );
int method = flags & ( kDxt1 | kDxt3 | kDxt5 | kBc4 | kBc5 );
int fit = flags & ( kColourIterativeClusterFit | kColourClusterFit | kColourRangeFit );
int extra = flags & kWeightColourByAlpha;
// set defaults
if( method != kDxt3 && method != kDxt5 )
if ( method != kDxt3
&& method != kDxt5
&& method != kBc4
&& method != kBc5 )
{
method = kDxt1;
}
if( fit != kColourRangeFit && fit != kColourIterativeClusterFit )
fit = kColourClusterFit;
@@ -56,9 +61,34 @@ void CompressMasked( u8 const* rgba, int mask, void* block, int flags, float* me
// fix any bad flags
flags = FixFlags( flags );
if ( ( flags & ( kBc4 | kBc5 ) ) != 0 )
{
u8 alpha[16*4];
for( int i = 0; i < 16; ++i )
{
alpha[i*4 + 3] = rgba[i*4 + 0]; // copy R to A
}
u8* rBlock = reinterpret_cast< u8* >( block );
CompressAlphaDxt5( alpha, mask, rBlock );
if ( ( flags & ( kBc5 ) ) != 0 )
{
for( int i = 0; i < 16; ++i )
{
alpha[i*4 + 3] = rgba[i*4 + 1]; // copy G to A
}
u8* gBlock = reinterpret_cast< u8* >( block ) + 8;
CompressAlphaDxt5( alpha, mask, gBlock );
}
return;
}
// get the block locations
void* colourBlock = block;
void* alphaBock = block;
void* alphaBlock = block;
if( ( flags & ( kDxt3 | kDxt5 ) ) != 0 )
colourBlock = reinterpret_cast< u8* >( block ) + 8;
@@ -87,9 +117,9 @@ void CompressMasked( u8 const* rgba, int mask, void* block, int flags, float* me
// compress alpha separately if necessary
if( ( flags & kDxt3 ) != 0 )
CompressAlphaDxt3( rgba, mask, alphaBock );
CompressAlphaDxt3( rgba, mask, alphaBlock );
else if( ( flags & kDxt5 ) != 0 )
CompressAlphaDxt5( rgba, mask, alphaBock );
CompressAlphaDxt5( rgba, mask, alphaBlock );
}
void Decompress( u8* rgba, void const* block, int flags )
@@ -120,7 +150,7 @@ int GetStorageRequirements( int width, int height, int flags )
// compute the storage requirements
int blockcount = ( ( width + 3 )/4 ) * ( ( height + 3 )/4 );
int blocksize = ( ( flags & kDxt1 ) != 0 ) ? 8 : 16;
int blocksize = ( ( flags & ( kDxt1 | kBc4 ) ) != 0 ) ? 8 : 16;
return blockcount*blocksize;
}
@@ -131,7 +161,7 @@ void CompressImage( u8 const* rgba, int width, int height, void* blocks, int fla
// initialise the block output
u8* targetBlock = reinterpret_cast< u8* >( blocks );
int bytesPerBlock = ( ( flags & kDxt1 ) != 0 ) ? 8 : 16;
int bytesPerBlock = ( ( flags & ( kDxt1 | kBc4 ) ) != 0 ) ? 8 : 16;
// loop over blocks
for( int y = 0; y < height; y += 4 )
@@ -185,7 +215,7 @@ void DecompressImage( u8* rgba, int width, int height, void const* blocks, int f
// initialise the block input
u8 const* sourceBlock = reinterpret_cast< u8 const* >( blocks );
int bytesPerBlock = ( ( flags & kDxt1 ) != 0 ) ? 8 : 16;
int bytesPerBlock = ( ( flags & ( kDxt1 | kBc4 ) ) != 0 ) ? 8 : 16;
// loop over blocks
for( int y = 0; y < height; y += 4 )