91 lines
1.5 KiB
C++
91 lines
1.5 KiB
C++
#ifndef __DARKRL__MATH_HPP__
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#define __DARKRL__MATH_HPP__
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#include <algorithm>
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#include <math.h>
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#include "Types.hpp"
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template<typename T>
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inline T AlignPOT( T val )
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{
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if( val == 0 ) return 1;
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val--;
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for( unsigned int i=1; i<sizeof( T ) * 8; i <<= 1 )
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{
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val |= val >> i;
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}
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return val + 1;
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}
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inline int CountSetBits( uint32 val )
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{
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val -= ( val >> 1 ) & 0x55555555;
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val = ( ( val >> 2 ) & 0x33333333 ) + ( val & 0x33333333 );
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val = ( ( val >> 4 ) + val ) & 0x0f0f0f0f;
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val += val >> 8;
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val += val >> 16;
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return val & 0x0000003f;
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}
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inline int CountLeadingZeros( uint32 val )
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{
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val |= val >> 1;
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val |= val >> 2;
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val |= val >> 4;
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val |= val >> 8;
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val |= val >> 16;
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return 32 - CountSetBits( val );
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}
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inline float sRGB2linear( float v )
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{
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const float a = 0.055f;
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if( v <= 0.04045f )
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{
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return v / 12.92f;
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}
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else
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{
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return powf( ( v + a ) / ( 1 + a ), 2.4f );
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}
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}
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inline float linear2sRGB( float v )
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{
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const float a = 0.055f;
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if( v <= 0.0031308f )
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{
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return 12.92f * v;
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}
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else
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{
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return ( 1 + a ) * pow( v, 1/2.4f ) - a;
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}
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}
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template<class T>
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inline T SmoothStep( T x )
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{
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return x*x*(3-2*x);
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}
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inline uint8 clampu8( int32 val )
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{
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return std::min( std::max( 0, val ), 255 );
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}
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template<class T>
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inline T sq( T val )
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{
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return val * val;
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}
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static inline int mul8bit( int a, int b )
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{
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int t = a*b + 128;
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return ( t + ( t >> 8 ) ) >> 8;
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}
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#endif
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