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grade - compute white point in CIExy

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Dogway 2020-07-27 17:42:36 +01:00
parent 7e6c924d71
commit 1d654b5049
1 changed files with 12 additions and 28 deletions
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40
misc/grade.slang
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@ -56,9 +56,9 @@ layout(std140, set = 0, binding = 0) uniform UBO
/*
Grade
> Ubershader grouping some monolithic color related shaders:
::color-mangler (hunterk), ntsc color tuning knobs (Doriphor), white_point (hunterk, Dogway), RA Reshade LUT.
::color-mangler (hunterk), ntsc color tuning knobs (Doriphor), RA Reshade LUT.
> and the addition of:
::analogue color emulation, phosphor gamut, color space + TRC support, vibrance, HUE vs SAT, vignette (shared by Syh), black level, rolled gain and sigmoidal contrast.
::analogue color emulation, phosphor gamut, color space + TRC support, vibrance, HUE vs SAT, temperature, vignette (shared by Syh), black level, rolled gain and sigmoidal contrast.
Author: Dogway
License: Public domain
@ -275,41 +275,25 @@ vec3 YxytoXYZ(vec3 Yxy){
///////////////////////// White Point Mapping /////////////////////////
//
//
// From the first comment post (sRGB primaries and linear light compensated)
// >> http://www.zombieprototypes.com/?p=210#comment-4695029660
// Based on the Neil Bartlett's blog update
// >> http://www.zombieprototypes.com/?p=210
// Inspired itself by Tanner Helland's work
// >> http://www.tannerhelland.com/4435/convert-temperature-rgb-algorithm-code/
//
// PAL: D65 NTSC-U: D65 NTSC-J: CCT NTSC-J NTSC-FCC: C
// PAL: 6489K NTSC-U: 6504K NTSC-J: 8942K NTSC-FCC: 6780K
// 0.313 0.329 0.3127 0.3290 0.281 0.311 0.310, 0.316
vec3 wp_adjust(float temperature){
float temp = temperature / 100.;
float k = temperature / 10000.;
float lk = log(k);
float temp3 = pow(10.,3.) / temperature;
float temp6 = pow(10.,6.) / pow(temperature, 2.);
float temp9 = pow(10.,9.) / pow(temperature, 3.);
vec3 wp = vec3(1.);
// calculate RED
wp.r = (temp <= 65.) ? 1. : 0.32068362618584273 + (0.19668730877673762 * pow(k - 0.21298613432655075, - 1.5139012907556737)) + (- 0.013883432789258415 * lk);
wp.x = (temperature <= 7000.) ? 0.244063 + 0.09911 * temp3 + 2.9678 * temp6 - 4.6070 * temp9 : \
0.237040 + 0.24748 * temp3 + 1.9018 * temp6 - 2.0064 * temp9 ;
// calculate GREEN
float mg = 1.226916242502167 + (- 1.3109482654223614 * pow(k - 0.44267061967913873, 3.) * exp(- 5.089297600846147 * (k - 0.44267061967913873))) + (0.6453936305542096 * lk);
float pg = 0.4860175851734596 + (0.1802139719519286 * pow(k - 0.14573069517701578, - 1.397716496795082)) + (- 0.00803698899233844 * lk);
wp.g = (temp <= 65.5) ? ((temp <= 8.) ? 0. : mg) : pg;
wp.y = -3.000 * pow(wp.x,2.) + 2.870 * wp.x - 0.275;
wp.z = 1. - wp.x - wp.y;
// calculate BLUE
wp.b = (temp <= 19.) ? 0. : (temp >= 66.) ? 1. : 1.677499032830161 + (- 0.02313594016938082 * pow(k - 1.1367244820333684, 3.) * exp(- 4.221279555918655 * (k - 1.1367244820333684))) + (1.6550275798913296 * lk);
// clamp
wp.rgb = clamp(wp.rgb, vec3(0.), vec3(1.));
// Linear color input
return wp;
return wp.xyz;
}
////////////////////////////////////////////////////////////////////////////////
@ -808,7 +792,7 @@ void main()
vec3 vcolor = (global.LUT1_toggle == 0.0) ? col : mixfix(color1, color2, mixer);
// OETF - Opto-Electronic Transfer Function
// OETF - Opto-Electronic Transfer Function (to linear in Digital Terms)
vcolor = moncurve_f_f3(vcolor, 2.20 + 0.20, 0.055);
vcolor = RGB_to_XYZ(vcolor, 0.);
@ -908,7 +892,7 @@ void main()
m_in*src_h;
// White Point Mapping
vec3 wp = RGB_to_XYZ(wp_adjust(global.wp_temperature), 0.);
vec3 wp = wp_adjust(global.wp_temperature);
vec3 base = (crtgamut == 0.0) ? RGB_to_XYZ(src_h, SPC) : gamut;
base = XYZtoYxy(base);
vec3 adjusted = (crtgamut == 0.0) ? RGB_to_XYZ(src_h, SPC) * wp : gamut * wp;