dotfiles/.config/hypr/shaders/blue-light-v2.frag

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2024-01-08 22:21:05 +01:00
precision mediump float;
varying vec2 v_texcoord;
uniform sampler2D tex;
// 17.00 5600
// 17.30 5300
const float temperature = 2300.0;
const float temperatureStrength = 1.0;
#define WithQuickAndDirtyLuminancePreservation
const float LuminancePreservationFactor = 1.0;
// function from https://www.shadertoy.com/view/4sc3D7
// valid from 1000 to 40000 K (and additionally 0 for pure full white)
vec3 colorTemperatureToRGB(const in float temperature){
// values from: http://blenderartists.org/forum/showthread.php?270332-OSL-Goodness&p=2268693&viewfull=1#post2268693
mat3 m = (temperature <= 6500.0) ? mat3(vec3(0.0, -2902.1955373783176, -8257.7997278925690),
vec3(0.0, 1669.5803561666639, 2575.2827530017594),
vec3(1.0, 1.3302673723350029, 1.8993753891711275)) :
mat3(vec3(1745.0425298314172, 1216.6168361476490, -8257.7997278925690),
vec3(-2666.3474220535695, -2173.1012343082230, 2575.2827530017594),
vec3(0.55995389139931482, 0.70381203140554553, 1.8993753891711275));
return mix(
clamp(vec3(m[0] / (vec3(clamp(temperature, 1000.0, 40000.0)) + m[1]) + m[2]), vec3(0.0), vec3(1.0)),
vec3(1.0),
smoothstep(1000.0, 0.0, temperature)
);
}
void main() {
vec4 pixColor = texture2D(tex, v_texcoord);
// RGB
vec3 color = vec3(pixColor[0], pixColor[1], pixColor[2]);
#ifdef WithQuickAndDirtyLuminancePreservation
color *= mix(1.0,
dot(color, vec3(0.2126, 0.7152, 0.0722)) / max(dot(color, vec3(0.2126, 0.7152, 0.0722)), 1e-5),
LuminancePreservationFactor);
#endif
color = mix(color, color * colorTemperatureToRGB(temperature), temperatureStrength);
vec4 outCol = vec4(color, pixColor[3]);
gl_FragColor = outCol;
}