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Add goodness color generator.

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Bartosz Taudul 2021-05-23 12:49:20 +02:00
parent 1b589855e8
commit 2544b891de
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1 changed files with 64 additions and 0 deletions
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extra/color-hot.cpp Normal file
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#include <algorithm>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <math.h>
inline float linear2sRGB( float v )
{
float s1 = sqrt( v );
float s2 = sqrt( s1 );
float s3 = sqrt( s2 );
return 0.585122381f * s1 + 0.783140355f * s2 - 0.368262736f * s3;
}
float lerp( float v0, float v1, float t )
{
return ( 1-t ) * v0 + t * v1;
}
inline float sRGB2linear( float v )
{
return v * ( v * ( v * 0.305306011f + 0.682171111f ) + 0.012522878f );
}
int main()
{
int c0 = 0x3333FF;
int c1 = 0x33FF33;
uint32_t t[256] = {};
float r0 = ( c0 & 0xFF ) / 255.f;
float r1 = ( c1 & 0xFF ) / 255.f;
float g0 = ( ( c0 >> 8 ) & 0xFF ) / 255.f;
float g1 = ( ( c1 >> 8 ) & 0xFF ) / 255.f;
float b0 = ( ( c0 >> 16 ) & 0xFF ) / 255.f;
float b1 = ( ( c1 >> 16 ) & 0xFF ) / 255.f;
for( int i=0; i<256; i++ )
{
float m = i / 255.f;
float rf = linear2sRGB( lerp( sRGB2linear( r0 ), sRGB2linear( r1 ), m ) );
float gf = linear2sRGB( lerp( sRGB2linear( g0 ), sRGB2linear( g1 ), m ) );
float bf = linear2sRGB( lerp( sRGB2linear( b0 ), sRGB2linear( b1 ), m ) );
int r = (int)std::clamp( rf * 255.f, 0.f, 255.f );
int g = (int)std::clamp( gf * 255.f, 0.f, 255.f );
int b = (int)std::clamp( bf * 255.f, 0.f, 255.f );
t[i] = 0xFF000000 | ( b << 16 ) | ( g << 8 ) | r;
}
printf( "uint32_t GoodnessColor[256] = {\n" );
for( int i=0; i<256; i += 8 )
{
printf( " " );
for( int j=i; j<i+8; j++ )
{
printf( " 0x%X,", t[j] );
}
printf( "\n" );
}
printf( "};\n" );
}