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65 lines
1.6 KiB
C++
65 lines
1.6 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 linear2sRGB( float v )
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{
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float s1 = sqrt( v );
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float s2 = sqrt( s1 );
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float s3 = sqrt( s2 );
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return 0.585122381f * s1 + 0.783140355f * s2 - 0.368262736f * s3;
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}
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float lerp( float v0, float v1, float t )
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{
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return ( 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 = 0x3333FF;
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int c1 = 0x33FF33;
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uint32_t t[256] = {};
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float r0 = ( c0 & 0xFF ) / 255.f;
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float r1 = ( c1 & 0xFF ) / 255.f;
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float g0 = ( ( c0 >> 8 ) & 0xFF ) / 255.f;
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float g1 = ( ( c1 >> 8 ) & 0xFF ) / 255.f;
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float b0 = ( ( c0 >> 16 ) & 0xFF ) / 255.f;
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float b1 = ( ( c1 >> 16 ) & 0xFF ) / 255.f;
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for( int i=0; i<256; i++ )
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{
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float m = i / 255.f;
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float rf = linear2sRGB( lerp( sRGB2linear( r0 ), sRGB2linear( r1 ), m ) );
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float gf = linear2sRGB( lerp( sRGB2linear( g0 ), sRGB2linear( g1 ), m ) );
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float bf = linear2sRGB( lerp( sRGB2linear( b0 ), sRGB2linear( b1 ), m ) );
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int r = (int)std::clamp( rf * 255.f, 0.f, 255.f );
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int g = (int)std::clamp( gf * 255.f, 0.f, 255.f );
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int b = (int)std::clamp( bf * 255.f, 0.f, 255.f );
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t[i] = 0xFF000000 | ( b << 16 ) | ( g << 8 ) | r;
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}
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printf( "uint32_t GoodnessColor[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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