d840165a32
- `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>
92 lines
1.7 KiB
C++
92 lines
1.7 KiB
C++
#ifndef __DARKRL__MATH_HPP__
|
|
#define __DARKRL__MATH_HPP__
|
|
|
|
#include <algorithm>
|
|
#include <cmath>
|
|
#include <stdint.h>
|
|
|
|
#include "ForceInline.hpp"
|
|
|
|
template<typename T>
|
|
static etcpak_force_inline T AlignPOT( T val )
|
|
{
|
|
if( val == 0 ) return 1;
|
|
val--;
|
|
for( unsigned int i=1; i<sizeof( T ) * 8; i <<= 1 )
|
|
{
|
|
val |= val >> i;
|
|
}
|
|
return val + 1;
|
|
}
|
|
|
|
static etcpak_force_inline int CountSetBits( uint32_t val )
|
|
{
|
|
val -= ( val >> 1 ) & 0x55555555;
|
|
val = ( ( val >> 2 ) & 0x33333333 ) + ( val & 0x33333333 );
|
|
val = ( ( val >> 4 ) + val ) & 0x0f0f0f0f;
|
|
val += val >> 8;
|
|
val += val >> 16;
|
|
return val & 0x0000003f;
|
|
}
|
|
|
|
static etcpak_force_inline int CountLeadingZeros( uint32_t val )
|
|
{
|
|
val |= val >> 1;
|
|
val |= val >> 2;
|
|
val |= val >> 4;
|
|
val |= val >> 8;
|
|
val |= val >> 16;
|
|
return 32 - CountSetBits( val );
|
|
}
|
|
|
|
static etcpak_force_inline float sRGB2linear( float v )
|
|
{
|
|
const float a = 0.055f;
|
|
if( v <= 0.04045f )
|
|
{
|
|
return v / 12.92f;
|
|
}
|
|
else
|
|
{
|
|
return pow( ( v + a ) / ( 1 + a ), 2.4f );
|
|
}
|
|
}
|
|
|
|
static etcpak_force_inline float linear2sRGB( float v )
|
|
{
|
|
const float a = 0.055f;
|
|
if( v <= 0.0031308f )
|
|
{
|
|
return 12.92f * v;
|
|
}
|
|
else
|
|
{
|
|
return ( 1 + a ) * pow( v, 1/2.4f ) - a;
|
|
}
|
|
}
|
|
|
|
template<class T>
|
|
static etcpak_force_inline T SmoothStep( T x )
|
|
{
|
|
return x*x*(3-2*x);
|
|
}
|
|
|
|
static etcpak_force_inline uint8_t clampu8( int32_t val )
|
|
{
|
|
if( ( val & ~0xFF ) == 0 ) return val;
|
|
return ( ( ~val ) >> 31 ) & 0xFF;
|
|
}
|
|
|
|
template<class T>
|
|
static etcpak_force_inline T sq( T val )
|
|
{
|
|
return val * val;
|
|
}
|
|
|
|
static etcpak_force_inline int mul8bit( int a, int b )
|
|
{
|
|
int t = a*b + 128;
|
|
return ( t + ( t >> 8 ) ) >> 8;
|
|
}
|
|
|
|
#endif
|