godot/thirdparty/etcpak/ProcessCommon.hpp
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

50 lines
1.1 KiB
C++

#ifndef __PROCESSCOMMON_HPP__
#define __PROCESSCOMMON_HPP__
#include <assert.h>
#include <stddef.h>
#include <stdint.h>
template<class T>
static size_t GetLeastError( const T* err, size_t num )
{
size_t idx = 0;
for( size_t i=1; i<num; i++ )
{
if( err[i] < err[idx] )
{
idx = i;
}
}
return idx;
}
static uint64_t FixByteOrder( uint64_t d )
{
return ( ( d & 0x00000000FFFFFFFF ) ) |
( ( d & 0xFF00000000000000 ) >> 24 ) |
( ( d & 0x000000FF00000000 ) << 24 ) |
( ( d & 0x00FF000000000000 ) >> 8 ) |
( ( d & 0x0000FF0000000000 ) << 8 );
}
template<class T, class S>
static uint64_t EncodeSelectors( uint64_t d, const T terr[2][8], const S tsel[16][8], const uint32_t* id )
{
size_t tidx[2];
tidx[0] = GetLeastError( terr[0], 8 );
tidx[1] = GetLeastError( terr[1], 8 );
d |= tidx[0] << 26;
d |= tidx[1] << 29;
for( int i=0; i<16; i++ )
{
uint64_t t = tsel[i][tidx[id[i]%2]];
d |= ( t & 0x1 ) << ( i + 32 );
d |= ( t & 0x2 ) << ( i + 47 );
}
return d;
}
#endif