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kDxt1GCN flag

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master
Jack Andersen 8 years ago
parent 21d3742aa5
commit ac84440bec
8 changed files with 221 additions and 193 deletions
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  1. 11
      clusterfit.cpp
  2. 356
      colourblockGCN.cpp
  3. 2
      colourfit.cpp
  4. 2
      colourset.cpp
  5. 13
      rangefit.cpp
  6. 11
      singlecolourfit.cpp
  7. 16
      squish.cpp
  8. 3
      squish.h

11
clusterfit.cpp
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@ -27,6 +27,7 @@
#include "clusterfit.h"
#include "colourset.h"
#include "colourblock.h"
#include "colourblockGCN.h"
#include <cfloat>
namespace squish {
@ -237,7 +238,10 @@ void ClusterFit::Compress3( void* block )
m_colours->RemapIndices( unordered, bestindices );
// save the block
WriteColourBlock3( beststart.GetVec3(), bestend.GetVec3(), bestindices, block );
if ( ( m_flags & kDxt1GCN ) != 0 )
WriteColourBlock3GCN( beststart.GetVec3(), bestend.GetVec3(), bestindices, block );
else
WriteColourBlock3( beststart.GetVec3(), bestend.GetVec3(), bestindices, block );
// save the error
m_besterror = besterror;
@ -382,7 +386,10 @@ void ClusterFit::Compress4( void* block )
m_colours->RemapIndices( unordered, bestindices );
// save the block
WriteColourBlock4( beststart.GetVec3(), bestend.GetVec3(), bestindices, block );
if ( ( m_flags & kDxt1GCN ) != 0 )
WriteColourBlock4GCN( beststart.GetVec3(), bestend.GetVec3(), bestindices, block );
else
WriteColourBlock4( beststart.GetVec3(), bestend.GetVec3(), bestindices, block );
// save the error
m_besterror = besterror;

356
colourblockGCN.cpp
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@ -1,28 +1,28 @@
/* -----------------------------------------------------------------------------
Fork of colourblock.cpp from libSquish.. modified to encode/decode DXT1
packed for the Nintendo GameCube's GX hardware.
Copyright (c) 2006 Simon Brown si@sjbrown.co.uk
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Fork of colourblock.cpp from libSquish.. modified to encode/decode DXT1
packed for the Nintendo GameCube's GX hardware.
Copyright (c) 2006 Simon Brown si@sjbrown.co.uk
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-------------------------------------------------------------------------- */
@ -32,188 +32,188 @@ namespace squish {
static int FloatToInt( float a, int limit )
{
// use ANSI round-to-zero behaviour to get round-to-nearest
int i = ( int )( a + 0.5f );
// use ANSI round-to-zero behaviour to get round-to-nearest
int i = ( int )( a + 0.5f );
// clamp to the limit
if( i < 0 )
i = 0;
else if( i > limit )
i = limit;
// clamp to the limit
if( i < 0 )
i = 0;
else if( i > limit )
i = limit;
// done
return i;
// done
return i;
}
static int FloatTo565( Vec3::Arg colour )
{
// get the components in the correct range
int r = FloatToInt( 31.0f*colour.X(), 31 );
int g = FloatToInt( 63.0f*colour.Y(), 63 );
int b = FloatToInt( 31.0f*colour.Z(), 31 );
// get the components in the correct range
int r = FloatToInt( 31.0f*colour.X(), 31 );
int g = FloatToInt( 63.0f*colour.Y(), 63 );
int b = FloatToInt( 31.0f*colour.Z(), 31 );
// pack into a single value
return ( r << 11 ) | ( g << 5 ) | b;
// pack into a single value
return ( r << 11 ) | ( g << 5 ) | b;
}
static void WriteColourBlock( int a, int b, u8* indices, void* block )
{
// get the block as bytes
u8* bytes = ( u8* )block;
// write the endpoints - GCN 16-bit words byte-swapped
bytes[1] = ( u8 )( a & 0xff );
bytes[0] = ( u8 )( a >> 8 );
bytes[3] = ( u8 )( b & 0xff );
bytes[2] = ( u8 )( b >> 8 );
// write the indices
for( int i = 0; i < 4; ++i )
{
u8 const* ind = indices + 4*i;
// GCN: indices reversed
bytes[4 + i] = ind[3] | ( ind[2] << 2 ) | ( ind[1] << 4 ) | ( ind[0] << 6 );
}
// get the block as bytes
u8* bytes = ( u8* )block;
// write the endpoints - GCN: 16-bit words byte-swapped
bytes[1] = ( u8 )( a & 0xff );
bytes[0] = ( u8 )( a >> 8 );
bytes[3] = ( u8 )( b & 0xff );
bytes[2] = ( u8 )( b >> 8 );
// write the indices
for( int i = 0; i < 4; ++i )
{
u8 const* ind = indices + 4*i;
// GCN: indices reversed
bytes[4 + i] = ind[3] | ( ind[2] << 2 ) | ( ind[1] << 4 ) | ( ind[0] << 6 );
}
}
void WriteColourBlock3GCN( Vec3::Arg start, Vec3::Arg end, u8 const* indices, void* block )
{
// get the packed values
int a = FloatTo565( start );
int b = FloatTo565( end );
// remap the indices
u8 remapped[16];
if( a <= b )
{
// use the indices directly
for( int i = 0; i < 16; ++i )
remapped[i] = indices[i];
}
else
{
// swap a and b
std::swap( a, b );
for( int i = 0; i < 16; ++i )
{
if( indices[i] == 0 )
remapped[i] = 1;
else if( indices[i] == 1 )
remapped[i] = 0;
else
remapped[i] = indices[i];
}
}
// write the block
WriteColourBlock( a, b, remapped, block );
// get the packed values
int a = FloatTo565( start );
int b = FloatTo565( end );
// remap the indices
u8 remapped[16];
if( a <= b )
{
// use the indices directly
for( int i = 0; i < 16; ++i )
remapped[i] = indices[i];
}
else
{
// swap a and b
std::swap( a, b );
for( int i = 0; i < 16; ++i )
{
if( indices[i] == 0 )
remapped[i] = 1;
else if( indices[i] == 1 )
remapped[i] = 0;
else
remapped[i] = indices[i];
}
}
// write the block
WriteColourBlock( a, b, remapped, block );
}
void WriteColourBlock4GCN( Vec3::Arg start, Vec3::Arg end, u8 const* indices, void* block )
{
// get the packed values
int a = FloatTo565( start );
int b = FloatTo565( end );
// remap the indices
u8 remapped[16];
if( a < b )
{
// swap a and b
std::swap( a, b );
for( int i = 0; i < 16; ++i )
remapped[i] = ( indices[i] ^ 0x1 ) & 0x3;
}
else if( a == b )
{
// use index 0
for( int i = 0; i < 16; ++i )
remapped[i] = 0;
}
else
{
// use the indices directly
for( int i = 0; i < 16; ++i )
remapped[i] = indices[i];
}
// write the block
WriteColourBlock( a, b, remapped, block );
// get the packed values
int a = FloatTo565( start );
int b = FloatTo565( end );
// remap the indices
u8 remapped[16];
if( a < b )
{
// swap a and b
std::swap( a, b );
for( int i = 0; i < 16; ++i )
remapped[i] = ( indices[i] ^ 0x1 ) & 0x3;
}
else if( a == b )
{
// use index 0
for( int i = 0; i < 16; ++i )
remapped[i] = 0;
}
else
{
// use the indices directly
for( int i = 0; i < 16; ++i )
remapped[i] = indices[i];
}
// write the block
WriteColourBlock( a, b, remapped, block );
}
static int Unpack565( u8 const* packed, u8* colour )
{
// build the packed value - GCN: indices reversed
int value = ( int )packed[1] | ( ( int )packed[0] << 8 );
// get the components in the stored range
u8 red = ( u8 )( ( value >> 11 ) & 0x1f );
u8 green = ( u8 )( ( value >> 5 ) & 0x3f );
u8 blue = ( u8 )( value & 0x1f );
// scale up to 8 bits
colour[0] = ( red << 3 ) | ( red >> 2 );
colour[1] = ( green << 2 ) | ( green >> 4 );
colour[2] = ( blue << 3 ) | ( blue >> 2 );
colour[3] = 255;
// return the value
return value;
// build the packed value - GCN: indices reversed
int value = ( int )packed[1] | ( ( int )packed[0] << 8 );
// get the components in the stored range
u8 red = ( u8 )( ( value >> 11 ) & 0x1f );
u8 green = ( u8 )( ( value >> 5 ) & 0x3f );
u8 blue = ( u8 )( value & 0x1f );
// scale up to 8 bits
colour[0] = ( red << 3 ) | ( red >> 2 );
colour[1] = ( green << 2 ) | ( green >> 4 );
colour[2] = ( blue << 3 ) | ( blue >> 2 );
colour[3] = 255;
// return the value
return value;
}
void DecompressColourGCN( u8* rgba, void const* block )
{
// get the block bytes
u8 const* bytes = reinterpret_cast< u8 const* >( block );
// unpack the endpoints
u8 codes[16];
int a = Unpack565( bytes, codes );
int b = Unpack565( bytes + 2, codes + 4 );
// generate the midpoints
for( int i = 0; i < 3; ++i )
{
int c = codes[i];
int d = codes[4 + i];
if( a <= b )
{
codes[8 + i] = ( u8 )( ( c + d )/2 );
codes[12 + i] = 0;
}
else
{
codes[8 + i] = ( u8 )( ( 2*c + d )/3 );
codes[12 + i] = ( u8 )( ( c + 2*d )/3 );
}
}
// fill in alpha for the intermediate values
codes[8 + 3] = 255;
codes[12 + 3] = ( a <= b ) ? 0 : 255;
// unpack the indices
u8 indices[16];
for( int i = 0; i < 4; ++i )
{
u8* ind = indices + 4*i;
u8 packed = bytes[4 + i];
// GCN: indices reversed
ind[3] = packed & 0x3;
ind[2] = ( packed >> 2 ) & 0x3;
ind[1] = ( packed >> 4 ) & 0x3;
ind[0] = ( packed >> 6 ) & 0x3;
}
// store out the colours
for( int i = 0; i < 16; ++i )
{
u8 offset = 4*indices[i];
for( int j = 0; j < 4; ++j )
rgba[4*i + j] = codes[offset + j];
}
// get the block bytes
u8 const* bytes = reinterpret_cast< u8 const* >( block );
// unpack the endpoints
u8 codes[16];
int a = Unpack565( bytes, codes );
int b = Unpack565( bytes + 2, codes + 4 );
// generate the midpoints
for( int i = 0; i < 3; ++i )
{
int c = codes[i];
int d = codes[4 + i];
if( a <= b )
{
codes[8 + i] = ( u8 )( ( c + d )/2 );
codes[12 + i] = 0;
}
else
{
codes[8 + i] = ( u8 )( ( 2*c + d )/3 );
codes[12 + i] = ( u8 )( ( c + 2*d )/3 );
}
}
// fill in alpha for the intermediate values
codes[8 + 3] = 255;
codes[12 + 3] = ( a <= b ) ? 0 : 255;
// unpack the indices
u8 indices[16];
for( int i = 0; i < 4; ++i )
{
u8* ind = indices + 4*i;
u8 packed = bytes[4 + i];
// GCN: indices reversed
ind[3] = packed & 0x3;
ind[2] = ( packed >> 2 ) & 0x3;
ind[1] = ( packed >> 4 ) & 0x3;
ind[0] = ( packed >> 6 ) & 0x3;
}
// store out the colours
for( int i = 0; i < 16; ++i )
{
u8 offset = 4*indices[i];
for( int j = 0; j < 4; ++j )
rgba[4*i + j] = codes[offset + j];
}
}
} // namespace squish

2
colourfit.cpp
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@ -40,7 +40,7 @@ ColourFit::~ColourFit()
void ColourFit::Compress( void* block )
{
bool isDxt1 = ( ( m_flags & kDxt1 ) != 0 );
bool isDxt1 = ( ( m_flags & ( kDxt1 | kDxt1GCN ) ) != 0 );
if( isDxt1 )
{
Compress3( block );

2
colourset.cpp
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@ -32,7 +32,7 @@ ColourSet::ColourSet( u8 const* rgba, int mask, int flags )
m_transparent( false )
{
// check the compression mode for dxt1
bool isDxt1 = ( ( flags & kDxt1 ) != 0 );
bool isDxt1 = ( ( flags & ( kDxt1 | kDxt1GCN ) ) != 0 );
bool weightByAlpha = ( ( flags & kWeightColourByAlpha ) != 0 );
// create the minimal set

13
rangefit.cpp
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@ -26,6 +26,7 @@
#include "rangefit.h"
#include "colourset.h"
#include "colourblock.h"
#include "colourblockGCN.h"
#include <cfloat>
namespace squish {
@ -138,8 +139,11 @@ void RangeFit::Compress3( void* block )
m_colours->RemapIndices( closest, indices );
// save the block
WriteColourBlock3( m_start, m_end, indices, block );
if ( ( m_flags & kDxt1GCN ) != 0 )
WriteColourBlock3GCN( m_start, m_end, indices, block );
else
WriteColourBlock3( m_start, m_end, indices, block );
// save the error
m_besterror = error;
}
@ -191,7 +195,10 @@ void RangeFit::Compress4( void* block )
m_colours->RemapIndices( closest, indices );
// save the block
WriteColourBlock4( m_start, m_end, indices, block );
if ( ( m_flags & kDxt1GCN ) != 0 )
WriteColourBlock4GCN( m_start, m_end, indices, block );
else
WriteColourBlock4( m_start, m_end, indices, block );
// save the error
m_besterror = error;

11
singlecolourfit.cpp
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@ -26,6 +26,7 @@
#include "singlecolourfit.h"
#include "colourset.h"
#include "colourblock.h"
#include "colourblockGCN.h"
namespace squish {
@ -92,7 +93,10 @@ void SingleColourFit::Compress3( void* block )
m_colours->RemapIndices( &m_index, indices );
// save the block
WriteColourBlock3( m_start, m_end, indices, block );
if ( ( m_flags & kDxt1GCN ) != 0 )
WriteColourBlock3GCN( m_start, m_end, indices, block );
else
WriteColourBlock3( m_start, m_end, indices, block );
// save the error
m_besterror = m_error;
@ -120,7 +124,10 @@ void SingleColourFit::Compress4( void* block )
m_colours->RemapIndices( &m_index, indices );
// save the block
WriteColourBlock4( m_start, m_end, indices, block );
if ( ( m_flags & kDxt1GCN ) != 0 )
WriteColourBlock4GCN( m_start, m_end, indices, block );
else
WriteColourBlock4( m_start, m_end, indices, block );
// save the error
m_besterror = m_error;

16
squish.cpp
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@ -29,6 +29,7 @@
#include "rangefit.h"
#include "clusterfit.h"
#include "colourblock.h"
#include "colourblockGCN.h"
#include "alpha.h"
#include "singlecolourfit.h"
@ -37,12 +38,12 @@ namespace squish {
static int FixFlags( int flags )
{
// grab the flag bits
int method = flags & ( kDxt1 | kDxt3 | kDxt5 );
int method = flags & ( kDxt1 | kDxt3 | kDxt5 | kDxt1GCN );
int fit = flags & ( kColourIterativeClusterFit | kColourClusterFit | kColourRangeFit );
int extra = flags & kWeightColourByAlpha;
// set defaults
if( method != kDxt3 && method != kDxt5 )
if( method != kDxt3 && method != kDxt5 && method != kDxt1GCN )
method = kDxt1;
if( fit != kColourRangeFit && fit != kColourIterativeClusterFit )
fit = kColourClusterFit;
@ -104,7 +105,10 @@ void Decompress( u8* rgba, void const* block, int flags )
colourBlock = reinterpret_cast< u8 const* >( block ) + 8;
// decompress colour
DecompressColour( rgba, colourBlock, ( flags & kDxt1 ) != 0 );
if ( ( flags & kDxt1GCN ) != 0 )
DecompressColourGCN( rgba, colourBlock );
else
DecompressColour( rgba, colourBlock, ( flags & kDxt1 ) != 0 );
// decompress alpha separately if necessary
if( ( flags & kDxt3 ) != 0 )
@ -120,7 +124,7 @@ 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 | kDxt1GCN ) ) != 0 ) ? 8 : 16;
return blockcount*blocksize;
}
@ -131,7 +135,7 @@ 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 | kDxt1GCN ) ) != 0 ) ? 8 : 16;
// loop over blocks
for( int y = 0; y < height; y += 4 )
@ -185,7 +189,7 @@ 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 | kDxt1GCN ) ) != 0 ) ? 8 : 16;
// loop over blocks
for( int y = 0; y < height; y += 4 )

3
squish.h
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@ -46,6 +46,9 @@ enum
//! Use DXT5 compression.
kDxt5 = ( 1 << 2 ),
//! Use DXT1 compression with GCN byte-ordering
kDxt1GCN = ( 1 << 9 ),
//! Use a very slow but very high quality colour compressor.
kColourIterativeClusterFit = ( 1 << 8 ),

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