78 lines
1.8 KiB
C++
78 lines
1.8 KiB
C++
#include <algorithm>
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#include <string.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <math.h>
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inline float sqrtfast( float v )
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{
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union
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{
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int i;
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float f;
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} u;
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u.f = v;
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u.i -= 1 << 23;
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u.i >>= 1;
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u.i += 1 << 29;
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return u.f;
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}
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inline float linear2sRGB( float v )
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{
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float s1 = sqrtfast( v );
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float s2 = sqrtfast( s1 );
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float s3 = sqrtfast( s2 );
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return 0.585122381f * s1 + 0.783140355f * s2 - 0.368262736f * s3;
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}
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int lerp( int v0, int v1, float t )
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{
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return int( ( 1-t ) * v0 + t * v1 );
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}
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inline float sRGB2linear( float v )
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{
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return v * ( v * ( v * 0.305306011f + 0.682171111f ) + 0.012522878f );
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}
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int main()
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{
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int c0 = std::min( 255, int( sRGB2linear( 1.f ) * 255 ) );
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int c1 = std::min( 255, int( sRGB2linear( 0x44 / 255.f ) * 255 ) );
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int s0 = std::min( 255, int( sRGB2linear( 1.f ) * 255 * 0.5 ) );
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int s1 = std::min( 255, int( sRGB2linear( 0x44 / 255.f ) * 255 * 0.5 ) );
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float target = 80.f;
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uint32_t t[256];
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memset( t, 0, sizeof( uint32_t ) * 256 );
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for( int i=1; i<128; i++ )
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{
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float m = (i-1) / target;
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int l0 = std::min( 255, lerp( s0, c0, m ) );
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int l1 = std::min( 255, lerp( s1, c1, m ) );
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int g0 = std::min( 255, int( linear2sRGB( l0/255.f ) * 255 ) );
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int g1 = std::min( 255, int( linear2sRGB( l1/255.f ) * 255 ) );
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g0 = l0;
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g1 = l1;
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t[i] = 0xFF000000 | ( g1 << 16 ) | ( g0 << 8 ) | g1;
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t[uint8_t(-i)] = 0xFF000000 | ( g1 << 16 ) | ( g1 << 8 ) | g0;
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}
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printf( "uint32_t MemDecayColor[256] = {\n" );
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for( int i=0; i<256; i += 8 )
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{
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printf( " " );
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for( int j=i; j<i+8; j++ )
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{
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printf( " 0x%X,", t[j] );
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}
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printf( "\n" );
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}
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printf( "};\n" );
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}
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