#ifndef DARKRL__MATH_HPP__ #define DARKRL__MATH_HPP__ #if defined __GNUC__ # pragma GCC diagnostic push # pragma GCC diagnostic ignored "-Wunused-parameter" #endif #include <algorithm> #if defined __GNUC__ # pragma GCC diagnostic pop #endif #include "Types.hpp" template<typename T> 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; } inline int CountSetBits( uint32 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; } inline int CountLeadingZeros( uint32 val ) { val |= val >> 1; val |= val >> 2; val |= val >> 4; val |= val >> 8; val |= val >> 16; return 32 - CountSetBits( val ); } 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 ); } } 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> inline T SmoothStep( T x ) { return x*x*(3-2*x); } inline uint8 clampu8( int32 val ) { return std::min( std::max( 0, val ), 255 ); } template<class T> inline T sq( T val ) { return val * val; } static inline int mul8bit( int a, int b ) { int t = a*b + 128; return ( t + ( t >> 8 ) ) >> 8; } #endif