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godot/thirdparty/etcpak/BlockData.cpp
K. S. Ernest (iFire) Lee d840165a32
Add etcpak library for faster ETC/ETC2/S3TC imports. 
- `etc` module was renamed to `etcpak` and modified to use the new library.
- PKM importer is removed in the process, it's obsolete.
- Old library `etc2comp` is removed.
- S3TC compression no longer done via `squish` (but decompression still is).
- Slight modifications to etcpak sources for MinGW compatibility,
  to fix LLVM `-Wc++11-narrowing` errors, and to allow using vendored or
  system libpng.

Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>
2021-04-13 00:12:12 +02:00

1297 lines
39 KiB
C++
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#include <assert.h>
#include <string.h>
#include "BlockData.hpp"
#include "ColorSpace.hpp"
#include "Debug.hpp"
#include "MipMap.hpp"
#include "mmap.hpp"
#include "ProcessRGB.hpp"
#include "ProcessDxtc.hpp"
#include "Tables.hpp"
#include "TaskDispatch.hpp"
#ifdef __ARM_NEON
# include <arm_neon.h>
#endif
#if defined __SSE4_1__ || defined __AVX2__ || defined _MSC_VER
# ifdef _MSC_VER
# include <intrin.h>
# include <Windows.h>
# define _bswap(x) _byteswap_ulong(x)
# define _bswap64(x) _byteswap_uint64(x)
# else
# include <x86intrin.h>
# endif
#endif
#ifndef _bswap
# define _bswap(x) __builtin_bswap32(x)
# define _bswap64(x) __builtin_bswap64(x)
#endif
static uint8_t table59T58H[8] = { 3,6,11,16,23,32,41,64 };
BlockData::BlockData( const char* fn )
: m_file( fopen( fn, "rb" ) )
{
assert( m_file );
fseek( m_file, 0, SEEK_END );
m_maplen = ftell( m_file );
fseek( m_file, 0, SEEK_SET );
m_data = (uint8_t*)mmap( nullptr, m_maplen, PROT_READ, MAP_SHARED, fileno( m_file ), 0 );
auto data32 = (uint32_t*)m_data;
if( *data32 == 0x03525650 )
{
// PVR
switch( *(data32+2) )
{
case 6:
m_type = Etc1;
break;
case 7:
m_type = Dxt1;
break;
case 11:
m_type = Dxt5;
break;
case 22:
m_type = Etc2_RGB;
break;
case 23:
m_type = Etc2_RGBA;
break;
default:
assert( false );
break;
}
m_size.y = *(data32+6);
m_size.x = *(data32+7);
m_dataOffset = 52 + *(data32+12);
}
else if( *data32 == 0x58544BAB )
{
// KTX
switch( *(data32+7) )
{
case 0x9274:
m_type = Etc2_RGB;
break;
case 0x9278:
m_type = Etc2_RGBA;
break;
default:
assert( false );
break;
}
m_size.x = *(data32+9);
m_size.y = *(data32+10);
m_dataOffset = sizeof( uint32_t ) * 17 + *(data32+15);
}
else
{
assert( false );
}
}
static uint8_t* OpenForWriting( const char* fn, size_t len, const v2i& size, FILE** f, int levels, BlockData::Type type )
{
*f = fopen( fn, "wb+" );
assert( *f );
fseek( *f, len - 1, SEEK_SET );
const char zero = 0;
fwrite( &zero, 1, 1, *f );
fseek( *f, 0, SEEK_SET );
auto ret = (uint8_t*)mmap( nullptr, len, PROT_WRITE, MAP_SHARED, fileno( *f ), 0 );
auto dst = (uint32_t*)ret;
*dst++ = 0x03525650; // version
*dst++ = 0; // flags
switch( type ) // pixelformat[0]
{
case BlockData::Etc1:
*dst++ = 6;
break;
case BlockData::Etc2_RGB:
*dst++ = 22;
break;
case BlockData::Etc2_RGBA:
*dst++ = 23;
break;
case BlockData::Dxt1:
*dst++ = 7;
break;
case BlockData::Dxt5:
*dst++ = 11;
break;
default:
assert( false );
break;
}
*dst++ = 0; // pixelformat[1]
*dst++ = 0; // colourspace
*dst++ = 0; // channel type
*dst++ = size.y; // height
*dst++ = size.x; // width
*dst++ = 1; // depth
*dst++ = 1; // num surfs
*dst++ = 1; // num faces
*dst++ = levels; // mipmap count
*dst++ = 0; // metadata size
return ret;
}
static int AdjustSizeForMipmaps( const v2i& size, int levels )
{
int len = 0;
v2i current = size;
for( int i=1; i<levels; i++ )
{
assert( current.x != 1 || current.y != 1 );
current.x = std::max( 1, current.x / 2 );
current.y = std::max( 1, current.y / 2 );
len += std::max( 4, current.x ) * std::max( 4, current.y ) / 2;
}
assert( current.x == 1 && current.y == 1 );
return len;
}
BlockData::BlockData( const char* fn, const v2i& size, bool mipmap, Type type )
: m_size( size )
, m_dataOffset( 52 )
, m_maplen( m_size.x*m_size.y/2 )
, m_type( type )
{
assert( m_size.x%4 == 0 && m_size.y%4 == 0 );
uint32_t cnt = m_size.x * m_size.y / 16;
DBGPRINT( cnt << " blocks" );
int levels = 1;
if( mipmap )
{
levels = NumberOfMipLevels( size );
DBGPRINT( "Number of mipmaps: " << levels );
m_maplen += AdjustSizeForMipmaps( size, levels );
}
if( type == Etc2_RGBA || type == Dxt5 ) m_maplen *= 2;
m_maplen += m_dataOffset;
m_data = OpenForWriting( fn, m_maplen, m_size, &m_file, levels, type );
}
BlockData::BlockData( const v2i& size, bool mipmap, Type type )
: m_size( size )
, m_dataOffset( 52 )
, m_file( nullptr )
, m_maplen( m_size.x*m_size.y/2 )
, m_type( type )
{
assert( m_size.x%4 == 0 && m_size.y%4 == 0 );
if( mipmap )
{
const int levels = NumberOfMipLevels( size );
m_maplen += AdjustSizeForMipmaps( size, levels );
}
if( type == Etc2_RGBA || type == Dxt5 ) m_maplen *= 2;
m_maplen += m_dataOffset;
m_data = new uint8_t[m_maplen];
}
BlockData::~BlockData()
{
if( m_file )
{
munmap( m_data, m_maplen );
fclose( m_file );
}
else
{
delete[] m_data;
}
}
void BlockData::Process( const uint32_t* src, uint32_t blocks, size_t offset, size_t width, Channels type, bool dither )
{
auto dst = ((uint64_t*)( m_data + m_dataOffset )) + offset;
if( type == Channels::Alpha )
{
if( m_type != Etc1 )
{
CompressEtc2Alpha( src, dst, blocks, width );
}
else
{
CompressEtc1Alpha( src, dst, blocks, width );
}
}
else
{
switch( m_type )
{
case Etc1:
if( dither )
{
CompressEtc1RgbDither( src, dst, blocks, width );
}
else
{
CompressEtc1Rgb( src, dst, blocks, width );
}
break;
case Etc2_RGB:
CompressEtc2Rgb( src, dst, blocks, width );
break;
case Dxt1:
if( dither )
{
CompressDxt1Dither( src, dst, blocks, width );
}
else
{
CompressDxt1( src, dst, blocks, width );
}
break;
default:
assert( false );
break;
}
}
}
void BlockData::ProcessRGBA( const uint32_t* src, uint32_t blocks, size_t offset, size_t width )
{
auto dst = ((uint64_t*)( m_data + m_dataOffset )) + offset * 2;
switch( m_type )
{
case Etc2_RGBA:
CompressEtc2Rgba( src, dst, blocks, width );
break;
case Dxt5:
CompressDxt5( src, dst, blocks, width );
break;
default:
assert( false );
break;
}
}
namespace
{
static etcpak_force_inline int32_t expand6(uint32_t value)
{
return (value << 2) | (value >> 4);
}
static etcpak_force_inline int32_t expand7(uint32_t value)
{
return (value << 1) | (value >> 6);
}
static etcpak_force_inline void DecodeT( uint64_t block, uint32_t* dst, uint32_t w )
{
const auto r0 = ( block >> 24 ) & 0x1B;
const auto rh0 = ( r0 >> 3 ) & 0x3;
const auto rl0 = r0 & 0x3;
const auto g0 = ( block >> 20 ) & 0xF;
const auto b0 = ( block >> 16 ) & 0xF;
const auto r1 = ( block >> 12 ) & 0xF;
const auto g1 = ( block >> 8 ) & 0xF;
const auto b1 = ( block >> 4 ) & 0xF;
const auto cr0 = ( ( rh0 << 6 ) | ( rl0 << 4 ) | ( rh0 << 2 ) | rl0);
const auto cg0 = ( g0 << 4 ) | g0;
const auto cb0 = ( b0 << 4 ) | b0;
const auto cr1 = ( r1 << 4 ) | r1;
const auto cg1 = ( g1 << 4 ) | g1;
const auto cb1 = ( b1 << 4 ) | b1;
const auto codeword_hi = ( block >> 2 ) & 0x3;
const auto codeword_lo = block & 0x1;
const auto codeword = ( codeword_hi << 1 ) | codeword_lo;
const auto c2r = clampu8( cr1 + table59T58H[codeword] );
const auto c2g = clampu8( cg1 + table59T58H[codeword] );
const auto c2b = clampu8( cb1 + table59T58H[codeword] );
const auto c3r = clampu8( cr1 - table59T58H[codeword] );
const auto c3g = clampu8( cg1 - table59T58H[codeword] );
const auto c3b = clampu8( cb1 - table59T58H[codeword] );
const uint32_t col_tab[4] = {
uint32_t(cr0 | ( cg0 << 8 ) | ( cb0 << 16 ) | 0xFF000000),
uint32_t(c2r | ( c2g << 8 ) | ( c2b << 16 ) | 0xFF000000),
uint32_t(cr1 | ( cg1 << 8 ) | ( cb1 << 16 ) | 0xFF000000),
uint32_t(c3r | ( c3g << 8 ) | ( c3b << 16 ) | 0xFF000000)
};
const uint32_t indexes = ( block >> 32 ) & 0xFFFFFFFF;
for( uint8_t j = 0; j < 4; j++ )
{
for( uint8_t i = 0; i < 4; i++ )
{
//2bit indices distributed on two lane 16bit numbers
const uint8_t index = ( ( ( indexes >> ( j + i * 4 + 16 ) ) & 0x1 ) << 1) | ( ( indexes >> ( j + i * 4 ) ) & 0x1);
dst[j * w + i] = col_tab[index];
}
}
}
static etcpak_force_inline void DecodeTAlpha( uint64_t block, uint64_t alpha, uint32_t* dst, uint32_t w )
{
const auto r0 = ( block >> 24 ) & 0x1B;
const auto rh0 = ( r0 >> 3 ) & 0x3;
const auto rl0 = r0 & 0x3;
const auto g0 = ( block >> 20 ) & 0xF;
const auto b0 = ( block >> 16 ) & 0xF;
const auto r1 = ( block >> 12 ) & 0xF;
const auto g1 = ( block >> 8 ) & 0xF;
const auto b1 = ( block >> 4 ) & 0xF;
const auto cr0 = ( ( rh0 << 6 ) | ( rl0 << 4 ) | ( rh0 << 2 ) | rl0);
const auto cg0 = ( g0 << 4 ) | g0;
const auto cb0 = ( b0 << 4 ) | b0;
const auto cr1 = ( r1 << 4 ) | r1;
const auto cg1 = ( g1 << 4 ) | g1;
const auto cb1 = ( b1 << 4 ) | b1;
const auto codeword_hi = ( block >> 2 ) & 0x3;
const auto codeword_lo = block & 0x1;
const auto codeword = (codeword_hi << 1) | codeword_lo;
const int32_t base = alpha >> 56;
const int32_t mul = ( alpha >> 52 ) & 0xF;
const auto tbl = g_alpha[( alpha >> 48 ) & 0xF];
const auto c2r = clampu8( cr1 + table59T58H[codeword] );
const auto c2g = clampu8( cg1 + table59T58H[codeword] );
const auto c2b = clampu8( cb1 + table59T58H[codeword] );
const auto c3r = clampu8( cr1 - table59T58H[codeword] );
const auto c3g = clampu8( cg1 - table59T58H[codeword] );
const auto c3b = clampu8( cb1 - table59T58H[codeword] );
const uint32_t col_tab[4] = {
uint32_t(cr0 | ( cg0 << 8 ) | ( cb0 << 16 )),
uint32_t(c2r | ( c2g << 8 ) | ( c2b << 16 )),
uint32_t(cr1 | ( cg1 << 8 ) | ( cb1 << 16 )),
uint32_t(c3r | ( c3g << 8 ) | ( c3b << 16 ))
};
const uint32_t indexes = ( block >> 32 ) & 0xFFFFFFFF;
for( uint8_t j = 0; j < 4; j++ )
{
for( uint8_t i = 0; i < 4; i++ )
{
//2bit indices distributed on two lane 16bit numbers
const uint8_t index = ( ( ( indexes >> ( j + i * 4 + 16 ) ) & 0x1 ) << 1 ) | ( ( indexes >> ( j + i * 4 ) ) & 0x1 );
const auto amod = tbl[( alpha >> ( 45 - j * 3 - i * 12 ) ) & 0x7];
const uint32_t a = clampu8( base + amod * mul );
dst[j * w + i] = col_tab[index] | ( a << 24 );
}
}
}
static etcpak_force_inline void DecodeH( uint64_t block, uint32_t* dst, uint32_t w )
{
const uint32_t indexes = ( block >> 32 ) & 0xFFFFFFFF;
const auto r0444 = ( block >> 27 ) & 0xF;
const auto g0444 = ( ( block >> 20 ) & 0x1 ) | ( ( ( block >> 24 ) & 0x7 ) << 1 );
const auto b0444 = ( ( block >> 15 ) & 0x7 ) | ( ( ( block >> 19 ) & 0x1 ) << 3 );
const auto r1444 = ( block >> 11 ) & 0xF;
const auto g1444 = ( block >> 7 ) & 0xF;
const auto b1444 = ( block >> 3 ) & 0xF;
const auto r0 = ( r0444 << 4 ) | r0444;
const auto g0 = ( g0444 << 4 ) | g0444;
const auto b0 = ( b0444 << 4 ) | b0444;
const auto r1 = ( r1444 << 4 ) | r1444;
const auto g1 = ( g1444 << 4 ) | g1444;
const auto b1 = ( b1444 << 4 ) | b1444;
const auto codeword_hi = ( ( block & 0x1 ) << 1 ) | ( ( block & 0x4 ) );
const auto c0 = ( r0444 << 8 ) | ( g0444 << 4 ) | ( b0444 << 0 );
const auto c1 = ( block >> 3 ) & ( ( 1 << 12 ) - 1 );
const auto codeword_lo = ( c0 >= c1 ) ? 1 : 0;
const auto codeword = codeword_hi | codeword_lo;
const uint32_t col_tab[] = {
uint32_t(clampu8( r0 + table59T58H[codeword] ) | ( clampu8( g0 + table59T58H[codeword] ) << 8 ) | ( clampu8( b0 + table59T58H[codeword] ) << 16 )),
uint32_t(clampu8( r0 - table59T58H[codeword] ) | ( clampu8( g0 - table59T58H[codeword] ) << 8 ) | ( clampu8( b0 - table59T58H[codeword] ) << 16 )),
uint32_t(clampu8( r1 + table59T58H[codeword] ) | ( clampu8( g1 + table59T58H[codeword] ) << 8 ) | ( clampu8( b1 + table59T58H[codeword] ) << 16 )),
uint32_t(clampu8( r1 - table59T58H[codeword] ) | ( clampu8( g1 - table59T58H[codeword] ) << 8 ) | ( clampu8( b1 - table59T58H[codeword] ) << 16 ))
};
for( uint8_t j = 0; j < 4; j++ )
{
for( uint8_t i = 0; i < 4; i++ )
{
const uint8_t index = ( ( ( indexes >> ( j + i * 4 + 16 ) ) & 0x1 ) << 1 ) | ( ( indexes >> ( j + i * 4 ) ) & 0x1 );
dst[j * w + i] = col_tab[index] | 0xFF000000;
}
}
}
static etcpak_force_inline void DecodeHAlpha( uint64_t block, uint64_t alpha, uint32_t* dst, uint32_t w )
{
const uint32_t indexes = ( block >> 32 ) & 0xFFFFFFFF;
const auto r0444 = ( block >> 27 ) & 0xF;
const auto g0444 = ( ( block >> 20 ) & 0x1 ) | ( ( ( block >> 24 ) & 0x7 ) << 1 );
const auto b0444 = ( ( block >> 15 ) & 0x7 ) | ( ( ( block >> 19 ) & 0x1 ) << 3 );
const auto r1444 = ( block >> 11 ) & 0xF;
const auto g1444 = ( block >> 7 ) & 0xF;
const auto b1444 = ( block >> 3 ) & 0xF;
const auto r0 = ( r0444 << 4 ) | r0444;
const auto g0 = ( g0444 << 4 ) | g0444;
const auto b0 = ( b0444 << 4 ) | b0444;
const auto r1 = ( r1444 << 4 ) | r1444;
const auto g1 = ( g1444 << 4 ) | g1444;
const auto b1 = ( b1444 << 4 ) | b1444;
const auto codeword_hi = ( ( block & 0x1 ) << 1 ) | ( ( block & 0x4 ) );
const auto c0 = ( r0444 << 8 ) | ( g0444 << 4 ) | ( b0444 << 0 );
const auto c1 = ( block >> 3 ) & ( ( 1 << 12 ) - 1 );
const auto codeword_lo = ( c0 >= c1 ) ? 1 : 0;
const auto codeword = codeword_hi | codeword_lo;
const int32_t base = alpha >> 56;
const int32_t mul = ( alpha >> 52 ) & 0xF;
const auto tbl = g_alpha[(alpha >> 48) & 0xF];
const uint32_t col_tab[] = {
uint32_t(clampu8( r0 + table59T58H[codeword] ) | ( clampu8( g0 + table59T58H[codeword] ) << 8 ) | ( clampu8( b0 + table59T58H[codeword] ) << 16 )),
uint32_t(clampu8( r0 - table59T58H[codeword] ) | ( clampu8( g0 - table59T58H[codeword] ) << 8 ) | ( clampu8( b0 - table59T58H[codeword] ) << 16 )),
uint32_t(clampu8( r1 + table59T58H[codeword] ) | ( clampu8( g1 + table59T58H[codeword] ) << 8 ) | ( clampu8( b1 + table59T58H[codeword] ) << 16 )),
uint32_t(clampu8( r1 - table59T58H[codeword] ) | ( clampu8( g1 - table59T58H[codeword] ) << 8 ) | ( clampu8( b1 - table59T58H[codeword] ) << 16 ))
};
for( uint8_t j = 0; j < 4; j++ )
{
for( uint8_t i = 0; i < 4; i++ )
{
const uint8_t index = ( ( ( indexes >> ( j + i * 4 + 16 ) ) & 0x1 ) << 1 ) | ( ( indexes >> ( j + i * 4 ) ) & 0x1 );
const auto amod = tbl[( alpha >> ( 45 - j * 3 - i * 12) ) & 0x7];
const uint32_t a = clampu8( base + amod * mul );
dst[j * w + i] = col_tab[index] | ( a << 24 );
}
}
}
static etcpak_force_inline void DecodePlanar( uint64_t block, uint32_t* dst, uint32_t w )
{
const auto bv = expand6((block >> ( 0 + 32)) & 0x3F);
const auto gv = expand7((block >> ( 6 + 32)) & 0x7F);
const auto rv = expand6((block >> (13 + 32)) & 0x3F);
const auto bh = expand6((block >> (19 + 32)) & 0x3F);
const auto gh = expand7((block >> (25 + 32)) & 0x7F);
const auto rh0 = (block >> (32 - 32)) & 0x01;
const auto rh1 = ((block >> (34 - 32)) & 0x1F) << 1;
const auto rh = expand6(rh0 | rh1);
const auto bo0 = (block >> (39 - 32)) & 0x07;
const auto bo1 = ((block >> (43 - 32)) & 0x3) << 3;
const auto bo2 = ((block >> (48 - 32)) & 0x1) << 5;
const auto bo = expand6(bo0 | bo1 | bo2);
const auto go0 = (block >> (49 - 32)) & 0x3F;
const auto go1 = ((block >> (56 - 32)) & 0x01) << 6;
const auto go = expand7(go0 | go1);
const auto ro = expand6((block >> (57 - 32)) & 0x3F);
#ifdef __ARM_NEON
uint64_t init = uint64_t(uint16_t(rh-ro)) | ( uint64_t(uint16_t(gh-go)) << 16 ) | ( uint64_t(uint16_t(bh-bo)) << 32 );
int16x8_t chco = vreinterpretq_s16_u64( vdupq_n_u64( init ) );
init = uint64_t(uint16_t( (rv-ro) - 4 * (rh-ro) )) | ( uint64_t(uint16_t( (gv-go) - 4 * (gh-go) )) << 16 ) | ( uint64_t(uint16_t( (bv-bo) - 4 * (bh-bo) )) << 32 );
int16x8_t cvco = vreinterpretq_s16_u64( vdupq_n_u64( init ) );
init = uint64_t(4*ro+2) | ( uint64_t(4*go+2) << 16 ) | ( uint64_t(4*bo+2) << 32 ) | ( uint64_t(0xFFF) << 48 );
int16x8_t col = vreinterpretq_s16_u64( vdupq_n_u64( init ) );
for( int j=0; j<4; j++ )
{
for( int i=0; i<4; i++ )
{
uint8x8_t c = vqshrun_n_s16( col, 2 );
vst1_lane_u32( dst+j*w+i, vreinterpret_u32_u8( c ), 0 );
col = vaddq_s16( col, chco );
}
col = vaddq_s16( col, cvco );
}
#elif defined __AVX2__
const auto R0 = 4*ro+2;
const auto G0 = 4*go+2;
const auto B0 = 4*bo+2;
const auto RHO = rh-ro;
const auto GHO = gh-go;
const auto BHO = bh-bo;
__m256i cvco = _mm256_setr_epi16( rv - ro, gv - go, bv - bo, 0, rv - ro, gv - go, bv - bo, 0, rv - ro, gv - go, bv - bo, 0, rv - ro, gv - go, bv - bo, 0 );
__m256i col = _mm256_setr_epi16( R0, G0, B0, 0xFFF, R0+RHO, G0+GHO, B0+BHO, 0xFFF, R0+2*RHO, G0+2*GHO, B0+2*BHO, 0xFFF, R0+3*RHO, G0+3*GHO, B0+3*BHO, 0xFFF );
for( int j=0; j<4; j++ )
{
__m256i c = _mm256_srai_epi16( col, 2 );
__m128i s = _mm_packus_epi16( _mm256_castsi256_si128( c ), _mm256_extracti128_si256( c, 1 ) );
_mm_storeu_si128( (__m128i*)(dst+j*w), s );
col = _mm256_add_epi16( col, cvco );
}
#elif defined __SSE4_1__
__m128i chco = _mm_setr_epi16( rh - ro, gh - go, bh - bo, 0, 0, 0, 0, 0 );
__m128i cvco = _mm_setr_epi16( (rv - ro) - 4 * (rh - ro), (gv - go) - 4 * (gh - go), (bv - bo) - 4 * (bh - bo), 0, 0, 0, 0, 0 );
__m128i col = _mm_setr_epi16( 4*ro+2, 4*go+2, 4*bo+2, 0xFFF, 0, 0, 0, 0 );
for( int j=0; j<4; j++ )
{
for( int i=0; i<4; i++ )
{
__m128i c = _mm_srai_epi16( col, 2 );
__m128i s = _mm_packus_epi16( c, c );
dst[j*w+i] = _mm_cvtsi128_si32( s );
col = _mm_add_epi16( col, chco );
}
col = _mm_add_epi16( col, cvco );
}
#else
for( int j=0; j<4; j++ )
{
for( int i=0; i<4; i++ )
{
const uint32_t r = (i * (rh - ro) + j * (rv - ro) + 4 * ro + 2) >> 2;
const uint32_t g = (i * (gh - go) + j * (gv - go) + 4 * go + 2) >> 2;
const uint32_t b = (i * (bh - bo) + j * (bv - bo) + 4 * bo + 2) >> 2;
if( ( ( r | g | b ) & ~0xFF ) == 0 )
{
dst[j*w+i] = r | ( g << 8 ) | ( b << 16 ) | 0xFF000000;
}
else
{
const auto rc = clampu8( r );
const auto gc = clampu8( g );
const auto bc = clampu8( b );
dst[j*w+i] = rc | ( gc << 8 ) | ( bc << 16 ) | 0xFF000000;
}
}
}
#endif
}
static etcpak_force_inline void DecodePlanarAlpha( uint64_t block, uint64_t alpha, uint32_t* dst, uint32_t w )
{
const auto bv = expand6((block >> ( 0 + 32)) & 0x3F);
const auto gv = expand7((block >> ( 6 + 32)) & 0x7F);
const auto rv = expand6((block >> (13 + 32)) & 0x3F);
const auto bh = expand6((block >> (19 + 32)) & 0x3F);
const auto gh = expand7((block >> (25 + 32)) & 0x7F);
const auto rh0 = (block >> (32 - 32)) & 0x01;
const auto rh1 = ((block >> (34 - 32)) & 0x1F) << 1;
const auto rh = expand6(rh0 | rh1);
const auto bo0 = (block >> (39 - 32)) & 0x07;
const auto bo1 = ((block >> (43 - 32)) & 0x3) << 3;
const auto bo2 = ((block >> (48 - 32)) & 0x1) << 5;
const auto bo = expand6(bo0 | bo1 | bo2);
const auto go0 = (block >> (49 - 32)) & 0x3F;
const auto go1 = ((block >> (56 - 32)) & 0x01) << 6;
const auto go = expand7(go0 | go1);
const auto ro = expand6((block >> (57 - 32)) & 0x3F);
const int32_t base = alpha >> 56;
const int32_t mul = ( alpha >> 52 ) & 0xF;
const auto tbl = g_alpha[( alpha >> 48 ) & 0xF];
#ifdef __ARM_NEON
uint64_t init = uint64_t(uint16_t(rh-ro)) | ( uint64_t(uint16_t(gh-go)) << 16 ) | ( uint64_t(uint16_t(bh-bo)) << 32 );
int16x8_t chco = vreinterpretq_s16_u64( vdupq_n_u64( init ) );
init = uint64_t(uint16_t( (rv-ro) - 4 * (rh-ro) )) | ( uint64_t(uint16_t( (gv-go) - 4 * (gh-go) )) << 16 ) | ( uint64_t(uint16_t( (bv-bo) - 4 * (bh-bo) )) << 32 );
int16x8_t cvco = vreinterpretq_s16_u64( vdupq_n_u64( init ) );
init = uint64_t(4*ro+2) | ( uint64_t(4*go+2) << 16 ) | ( uint64_t(4*bo+2) << 32 );
int16x8_t col = vreinterpretq_s16_u64( vdupq_n_u64( init ) );
for( int j=0; j<4; j++ )
{
for( int i=0; i<4; i++ )
{
const auto amod = tbl[(alpha >> ( 45 - j*3 - i*12 )) & 0x7];
const uint32_t a = clampu8( base + amod * mul );
uint8x8_t c = vqshrun_n_s16( col, 2 );
dst[j*w+i] = vget_lane_u32( vreinterpret_u32_u8( c ), 0 ) | ( a << 24 );
col = vaddq_s16( col, chco );
}
col = vaddq_s16( col, cvco );
}
#elif defined __SSE4_1__
__m128i chco = _mm_setr_epi16( rh - ro, gh - go, bh - bo, 0, 0, 0, 0, 0 );
__m128i cvco = _mm_setr_epi16( (rv - ro) - 4 * (rh - ro), (gv - go) - 4 * (gh - go), (bv - bo) - 4 * (bh - bo), 0, 0, 0, 0, 0 );
__m128i col = _mm_setr_epi16( 4*ro+2, 4*go+2, 4*bo+2, 0, 0, 0, 0, 0 );
for( int j=0; j<4; j++ )
{
for( int i=0; i<4; i++ )
{
const auto amod = tbl[(alpha >> ( 45 - j*3 - i*12 )) & 0x7];
const uint32_t a = clampu8( base + amod * mul );
__m128i c = _mm_srai_epi16( col, 2 );
__m128i s = _mm_packus_epi16( c, c );
dst[j*w+i] = _mm_cvtsi128_si32( s ) | ( a << 24 );
col = _mm_add_epi16( col, chco );
}
col = _mm_add_epi16( col, cvco );
}
#else
for (auto j = 0; j < 4; j++)
{
for (auto i = 0; i < 4; i++)
{
const uint32_t r = (i * (rh - ro) + j * (rv - ro) + 4 * ro + 2) >> 2;
const uint32_t g = (i * (gh - go) + j * (gv - go) + 4 * go + 2) >> 2;
const uint32_t b = (i * (bh - bo) + j * (bv - bo) + 4 * bo + 2) >> 2;
const auto amod = tbl[(alpha >> ( 45 - j*3 - i*12 )) & 0x7];
const uint32_t a = clampu8( base + amod * mul );
if( ( ( r | g | b ) & ~0xFF ) == 0 )
{
dst[j*w+i] = r | ( g << 8 ) | ( b << 16 ) | ( a << 24 );
}
else
{
const auto rc = clampu8( r );
const auto gc = clampu8( g );
const auto bc = clampu8( b );
dst[j*w+i] = rc | ( gc << 8 ) | ( bc << 16 ) | ( a << 24 );
}
}
}
#endif
}
}
BitmapPtr BlockData::Decode()
{
switch( m_type )
{
case Etc1:
case Etc2_RGB:
return DecodeRGB();
case Etc2_RGBA:
return DecodeRGBA();
case Dxt1:
return DecodeDxt1();
case Dxt5:
return DecodeDxt5();
default:
assert( false );
return nullptr;
}
}
static etcpak_force_inline uint64_t ConvertByteOrder( uint64_t d )
{
uint32_t word[2];
memcpy( word, &d, 8 );
word[0] = _bswap( word[0] );
word[1] = _bswap( word[1] );
memcpy( &d, word, 8 );
return d;
}
static etcpak_force_inline void DecodeRGBPart( uint64_t d, uint32_t* dst, uint32_t w )
{
d = ConvertByteOrder( d );
uint32_t br[2], bg[2], bb[2];
if( d & 0x2 )
{
int32_t dr, dg, db;
uint32_t r0 = ( d & 0xF8000000 ) >> 27;
uint32_t g0 = ( d & 0x00F80000 ) >> 19;
uint32_t b0 = ( d & 0x0000F800 ) >> 11;
dr = ( int32_t(d) << 5 ) >> 29;
dg = ( int32_t(d) << 13 ) >> 29;
db = ( int32_t(d) << 21 ) >> 29;
int32_t r1 = int32_t(r0) + dr;
int32_t g1 = int32_t(g0) + dg;
int32_t b1 = int32_t(b0) + db;
// T mode
if ( (r1 < 0) || (r1 > 31) )
{
DecodeT( d, dst, w );
return;
}
// H mode
if ((g1 < 0) || (g1 > 31))
{
DecodeH( d, dst, w );
return;
}
// P mode
if( (b1 < 0) || (b1 > 31) )
{
DecodePlanar( d, dst, w );
return;
}
br[0] = ( r0 << 3 ) | ( r0 >> 2 );
br[1] = ( r1 << 3 ) | ( r1 >> 2 );
bg[0] = ( g0 << 3 ) | ( g0 >> 2 );
bg[1] = ( g1 << 3 ) | ( g1 >> 2 );
bb[0] = ( b0 << 3 ) | ( b0 >> 2 );
bb[1] = ( b1 << 3 ) | ( b1 >> 2 );
}
else
{
br[0] = ( ( d & 0xF0000000 ) >> 24 ) | ( ( d & 0xF0000000 ) >> 28 );
br[1] = ( ( d & 0x0F000000 ) >> 20 ) | ( ( d & 0x0F000000 ) >> 24 );
bg[0] = ( ( d & 0x00F00000 ) >> 16 ) | ( ( d & 0x00F00000 ) >> 20 );
bg[1] = ( ( d & 0x000F0000 ) >> 12 ) | ( ( d & 0x000F0000 ) >> 16 );
bb[0] = ( ( d & 0x0000F000 ) >> 8 ) | ( ( d & 0x0000F000 ) >> 12 );
bb[1] = ( ( d & 0x00000F00 ) >> 4 ) | ( ( d & 0x00000F00 ) >> 8 );
}
unsigned int tcw[2];
tcw[0] = ( d & 0xE0 ) >> 5;
tcw[1] = ( d & 0x1C ) >> 2;
uint32_t b1 = ( d >> 32 ) & 0xFFFF;
uint32_t b2 = ( d >> 48 );
b1 = ( b1 | ( b1 << 8 ) ) & 0x00FF00FF;
b1 = ( b1 | ( b1 << 4 ) ) & 0x0F0F0F0F;
b1 = ( b1 | ( b1 << 2 ) ) & 0x33333333;
b1 = ( b1 | ( b1 << 1 ) ) & 0x55555555;
b2 = ( b2 | ( b2 << 8 ) ) & 0x00FF00FF;
b2 = ( b2 | ( b2 << 4 ) ) & 0x0F0F0F0F;
b2 = ( b2 | ( b2 << 2 ) ) & 0x33333333;
b2 = ( b2 | ( b2 << 1 ) ) & 0x55555555;
uint32_t idx = b1 | ( b2 << 1 );
if( d & 0x1 )
{
for( int i=0; i<4; i++ )
{
for( int j=0; j<4; j++ )
{
const auto mod = g_table[tcw[j/2]][idx & 0x3];
const auto r = br[j/2] + mod;
const auto g = bg[j/2] + mod;
const auto b = bb[j/2] + mod;
if( ( ( r | g | b ) & ~0xFF ) == 0 )
{
dst[j*w+i] = r | ( g << 8 ) | ( b << 16 ) | 0xFF000000;
}
else
{
const auto rc = clampu8( r );
const auto gc = clampu8( g );
const auto bc = clampu8( b );
dst[j*w+i] = rc | ( gc << 8 ) | ( bc << 16 ) | 0xFF000000;
}
idx >>= 2;
}
}
}
else
{
for( int i=0; i<4; i++ )
{
const auto tbl = g_table[tcw[i/2]];
const auto cr = br[i/2];
const auto cg = bg[i/2];
const auto cb = bb[i/2];
for( int j=0; j<4; j++ )
{
const auto mod = tbl[idx & 0x3];
const auto r = cr + mod;
const auto g = cg + mod;
const auto b = cb + mod;
if( ( ( r | g | b ) & ~0xFF ) == 0 )
{
dst[j*w+i] = r | ( g << 8 ) | ( b << 16 ) | 0xFF000000;
}
else
{
const auto rc = clampu8( r );
const auto gc = clampu8( g );
const auto bc = clampu8( b );
dst[j*w+i] = rc | ( gc << 8 ) | ( bc << 16 ) | 0xFF000000;
}
idx >>= 2;
}
}
}
}
static etcpak_force_inline void DecodeRGBAPart( uint64_t d, uint64_t alpha, uint32_t* dst, uint32_t w )
{
d = ConvertByteOrder( d );
alpha = _bswap64( alpha );
uint32_t br[2], bg[2], bb[2];
if( d & 0x2 )
{
int32_t dr, dg, db;
uint32_t r0 = ( d & 0xF8000000 ) >> 27;
uint32_t g0 = ( d & 0x00F80000 ) >> 19;
uint32_t b0 = ( d & 0x0000F800 ) >> 11;
dr = ( int32_t(d) << 5 ) >> 29;
dg = ( int32_t(d) << 13 ) >> 29;
db = ( int32_t(d) << 21 ) >> 29;
int32_t r1 = int32_t(r0) + dr;
int32_t g1 = int32_t(g0) + dg;
int32_t b1 = int32_t(b0) + db;
// T mode
if ( (r1 < 0) || (r1 > 31) )
{
DecodeTAlpha( d, alpha, dst, w );
return;
}
// H mode
if ( (g1 < 0) || (g1 > 31) )
{
DecodeHAlpha( d, alpha, dst, w );
return;
}
// P mode
if ( (b1 < 0) || (b1 > 31) )
{
DecodePlanarAlpha( d, alpha, dst, w );
return;
}
br[0] = ( r0 << 3 ) | ( r0 >> 2 );
br[1] = ( r1 << 3 ) | ( r1 >> 2 );
bg[0] = ( g0 << 3 ) | ( g0 >> 2 );
bg[1] = ( g1 << 3 ) | ( g1 >> 2 );
bb[0] = ( b0 << 3 ) | ( b0 >> 2 );
bb[1] = ( b1 << 3 ) | ( b1 >> 2 );
}
else
{
br[0] = ( ( d & 0xF0000000 ) >> 24 ) | ( ( d & 0xF0000000 ) >> 28 );
br[1] = ( ( d & 0x0F000000 ) >> 20 ) | ( ( d & 0x0F000000 ) >> 24 );
bg[0] = ( ( d & 0x00F00000 ) >> 16 ) | ( ( d & 0x00F00000 ) >> 20 );
bg[1] = ( ( d & 0x000F0000 ) >> 12 ) | ( ( d & 0x000F0000 ) >> 16 );
bb[0] = ( ( d & 0x0000F000 ) >> 8 ) | ( ( d & 0x0000F000 ) >> 12 );
bb[1] = ( ( d & 0x00000F00 ) >> 4 ) | ( ( d & 0x00000F00 ) >> 8 );
}
unsigned int tcw[2];
tcw[0] = ( d & 0xE0 ) >> 5;
tcw[1] = ( d & 0x1C ) >> 2;
uint32_t b1 = ( d >> 32 ) & 0xFFFF;
uint32_t b2 = ( d >> 48 );
b1 = ( b1 | ( b1 << 8 ) ) & 0x00FF00FF;
b1 = ( b1 | ( b1 << 4 ) ) & 0x0F0F0F0F;
b1 = ( b1 | ( b1 << 2 ) ) & 0x33333333;
b1 = ( b1 | ( b1 << 1 ) ) & 0x55555555;
b2 = ( b2 | ( b2 << 8 ) ) & 0x00FF00FF;
b2 = ( b2 | ( b2 << 4 ) ) & 0x0F0F0F0F;
b2 = ( b2 | ( b2 << 2 ) ) & 0x33333333;
b2 = ( b2 | ( b2 << 1 ) ) & 0x55555555;
uint32_t idx = b1 | ( b2 << 1 );
const int32_t base = alpha >> 56;
const int32_t mul = ( alpha >> 52 ) & 0xF;
const auto atbl = g_alpha[( alpha >> 48 ) & 0xF];
if( d & 0x1 )
{
for( int i=0; i<4; i++ )
{
for( int j=0; j<4; j++ )
{
const auto mod = g_table[tcw[j/2]][idx & 0x3];
const auto r = br[j/2] + mod;
const auto g = bg[j/2] + mod;
const auto b = bb[j/2] + mod;
const auto amod = atbl[(alpha >> ( 45 - j*3 - i*12 )) & 0x7];
const uint32_t a = clampu8( base + amod * mul );
if( ( ( r | g | b ) & ~0xFF ) == 0 )
{
dst[j*w+i] = r | ( g << 8 ) | ( b << 16 ) | ( a << 24 );
}
else
{
const auto rc = clampu8( r );
const auto gc = clampu8( g );
const auto bc = clampu8( b );
dst[j*w+i] = rc | ( gc << 8 ) | ( bc << 16 ) | ( a << 24 );
}
idx >>= 2;
}
}
}
else
{
for( int i=0; i<4; i++ )
{
const auto tbl = g_table[tcw[i/2]];
const auto cr = br[i/2];
const auto cg = bg[i/2];
const auto cb = bb[i/2];
for( int j=0; j<4; j++ )
{
const auto mod = tbl[idx & 0x3];
const auto r = cr + mod;
const auto g = cg + mod;
const auto b = cb + mod;
const auto amod = atbl[(alpha >> ( 45 - j*3 - i*12 )) & 0x7];
const uint32_t a = clampu8( base + amod * mul );
if( ( ( r | g | b ) & ~0xFF ) == 0 )
{
dst[j*w+i] = r | ( g << 8 ) | ( b << 16 ) | ( a << 24 );
}
else
{
const auto rc = clampu8( r );
const auto gc = clampu8( g );
const auto bc = clampu8( b );
dst[j*w+i] = rc | ( gc << 8 ) | ( bc << 16 ) | ( a << 24 );
}
idx >>= 2;
}
}
}
}
BitmapPtr BlockData::DecodeRGB()
{
auto ret = std::make_shared<Bitmap>( m_size );
const uint64_t* src = (const uint64_t*)( m_data + m_dataOffset );
uint32_t* dst = ret->Data();
for( int y=0; y<m_size.y/4; y++ )
{
for( int x=0; x<m_size.x/4; x++ )
{
uint64_t d = *src++;
DecodeRGBPart( d, dst, m_size.x );
dst += 4;
}
dst += m_size.x*3;
}
return ret;
}
BitmapPtr BlockData::DecodeRGBA()
{
auto ret = std::make_shared<Bitmap>( m_size );
const uint64_t* src = (const uint64_t*)( m_data + m_dataOffset );
uint32_t* dst = ret->Data();
for( int y=0; y<m_size.y/4; y++ )
{
for( int x=0; x<m_size.x/4; x++ )
{
uint64_t a = *src++;
uint64_t d = *src++;
DecodeRGBAPart( d, a, dst, m_size.x );
dst += 4;
}
dst += m_size.x*3;
}
return ret;
}
static etcpak_force_inline void DecodeDxt1Part( uint64_t d, uint32_t* dst, uint32_t w )
{
uint8_t* in = (uint8_t*)&d;
uint16_t c0, c1;
uint32_t idx;
memcpy( &c0, in, 2 );
memcpy( &c1, in+2, 2 );
memcpy( &idx, in+4, 4 );
uint8_t r0 = ( ( c0 & 0xF800 ) >> 8 ) | ( ( c0 & 0xF800 ) >> 13 );
uint8_t g0 = ( ( c0 & 0x07E0 ) >> 3 ) | ( ( c0 & 0x07E0 ) >> 9 );
uint8_t b0 = ( ( c0 & 0x001F ) << 3 ) | ( ( c0 & 0x001F ) >> 2 );
uint8_t r1 = ( ( c1 & 0xF800 ) >> 8 ) | ( ( c1 & 0xF800 ) >> 13 );
uint8_t g1 = ( ( c1 & 0x07E0 ) >> 3 ) | ( ( c1 & 0x07E0 ) >> 9 );
uint8_t b1 = ( ( c1 & 0x001F ) << 3 ) | ( ( c1 & 0x001F ) >> 2 );
uint32_t dict[4];
dict[0] = 0xFF000000 | ( b0 << 16 ) | ( g0 << 8 ) | r0;
dict[1] = 0xFF000000 | ( b1 << 16 ) | ( g1 << 8 ) | r1;
uint32_t r, g, b;
if( c0 > c1 )
{
r = (2*r0+r1)/3;
g = (2*g0+g1)/3;
b = (2*b0+b1)/3;
dict[2] = 0xFF000000 | ( b << 16 ) | ( g << 8 ) | r;
r = (2*r1+r0)/3;
g = (2*g1+g0)/3;
b = (2*b1+b0)/3;
dict[3] = 0xFF000000 | ( b << 16 ) | ( g << 8 ) | r;
}
else
{
r = (int(r0)+r1)/2;
g = (int(g0)+g1)/2;
b = (int(b0)+b1)/2;
dict[2] = 0xFF000000 | ( b << 16 ) | ( g << 8 ) | r;
dict[3] = 0xFF000000;
}
memcpy( dst+0, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+1, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+2, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+3, dict + (idx & 0x3), 4 );
idx >>= 2;
dst += w;
memcpy( dst+0, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+1, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+2, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+3, dict + (idx & 0x3), 4 );
idx >>= 2;
dst += w;
memcpy( dst+0, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+1, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+2, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+3, dict + (idx & 0x3), 4 );
idx >>= 2;
dst += w;
memcpy( dst+0, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+1, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+2, dict + (idx & 0x3), 4 );
idx >>= 2;
memcpy( dst+3, dict + (idx & 0x3), 4 );
}
static etcpak_force_inline void DecodeDxt5Part( uint64_t a, uint64_t d, uint32_t* dst, uint32_t w )
{
uint8_t* ain = (uint8_t*)&a;
uint8_t a0, a1;
uint64_t aidx = 0;
memcpy( &a0, ain, 1 );
memcpy( &a1, ain+1, 1 );
memcpy( &aidx, ain+2, 6 );
uint8_t* in = (uint8_t*)&d;
uint16_t c0, c1;
uint32_t idx;
memcpy( &c0, in, 2 );
memcpy( &c1, in+2, 2 );
memcpy( &idx, in+4, 4 );
uint32_t adict[8];
adict[0] = a0 << 24;
adict[1] = a1 << 24;
if( a0 > a1 )
{
adict[2] = ( (6*a0+1*a1)/7 ) << 24;
adict[3] = ( (5*a0+2*a1)/7 ) << 24;
adict[4] = ( (4*a0+3*a1)/7 ) << 24;
adict[5] = ( (3*a0+4*a1)/7 ) << 24;
adict[6] = ( (2*a0+5*a1)/7 ) << 24;
adict[7] = ( (1*a0+6*a1)/7 ) << 24;
}
else
{
adict[2] = ( (4*a0+1*a1)/5 ) << 24;
adict[3] = ( (3*a0+2*a1)/5 ) << 24;
adict[4] = ( (2*a0+3*a1)/5 ) << 24;
adict[5] = ( (1*a0+4*a1)/5 ) << 24;
adict[6] = 0;
adict[7] = 0xFF000000;
}
uint8_t r0 = ( ( c0 & 0xF800 ) >> 8 ) | ( ( c0 & 0xF800 ) >> 13 );
uint8_t g0 = ( ( c0 & 0x07E0 ) >> 3 ) | ( ( c0 & 0x07E0 ) >> 9 );
uint8_t b0 = ( ( c0 & 0x001F ) << 3 ) | ( ( c0 & 0x001F ) >> 2 );
uint8_t r1 = ( ( c1 & 0xF800 ) >> 8 ) | ( ( c1 & 0xF800 ) >> 13 );
uint8_t g1 = ( ( c1 & 0x07E0 ) >> 3 ) | ( ( c1 & 0x07E0 ) >> 9 );
uint8_t b1 = ( ( c1 & 0x001F ) << 3 ) | ( ( c1 & 0x001F ) >> 2 );
uint32_t dict[4];
dict[0] = ( b0 << 16 ) | ( g0 << 8 ) | r0;
dict[1] = ( b1 << 16 ) | ( g1 << 8 ) | r1;
uint32_t r, g, b;
if( c0 > c1 )
{
r = (2*r0+r1)/3;
g = (2*g0+g1)/3;
b = (2*b0+b1)/3;
dict[2] = ( b << 16 ) | ( g << 8 ) | r;
r = (2*r1+r0)/3;
g = (2*g1+g0)/3;
b = (2*b1+b0)/3;
dict[3] = ( b << 16 ) | ( g << 8 ) | r;
}
else
{
r = (int(r0)+r1)/2;
g = (int(g0)+g1)/2;
b = (int(b0)+b1)/2;
dict[2] = ( b << 16 ) | ( g << 8 ) | r;
dict[3] = 0;
}
dst[0] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[1] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[2] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[3] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst += w;
dst[0] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[1] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[2] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[3] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst += w;
dst[0] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[1] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[2] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[3] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst += w;
dst[0] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[1] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[2] = dict[idx & 0x3] | adict[aidx & 0x7];
idx >>= 2;
aidx >>= 3;
dst[3] = dict[idx & 0x3] | adict[aidx & 0x7];
}
BitmapPtr BlockData::DecodeDxt1()
{
auto ret = std::make_shared<Bitmap>( m_size );
const uint64_t* src = (const uint64_t*)( m_data + m_dataOffset );
uint32_t* dst = ret->Data();
for( int y=0; y<m_size.y/4; y++ )
{
for( int x=0; x<m_size.x/4; x++ )
{
uint64_t d = *src++;
DecodeDxt1Part( d, dst, m_size.x );
dst += 4;
}
dst += m_size.x*3;
}
return ret;
}
BitmapPtr BlockData::DecodeDxt5()
{
auto ret = std::make_shared<Bitmap>( m_size );
const uint64_t* src = (const uint64_t*)( m_data + m_dataOffset );
uint32_t* dst = ret->Data();
for( int y=0; y<m_size.y/4; y++ )
{
for( int x=0; x<m_size.x/4; x++ )
{
uint64_t a = *src++;
uint64_t d = *src++;
DecodeDxt5Part( a, d, dst, m_size.x );
dst += 4;
}
dst += m_size.x*3;
}
return ret;
}
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