52 lines
649 B
GLSL
52 lines
649 B
GLSL
|
// -*-C++-*-
|
||
|
|
#version 120
|
||
|
|
|
||
|
|
|
||
|
|
vec4 color_temperature (in float T)
|
||
|
|
{
|
||
|
|
T *=0.01;
|
||
|
|
|
||
|
|
float red;
|
||
|
|
float green;
|
||
|
|
float blue;
|
||
|
|
float alpha;
|
||
|
|
|
||
|
|
red = 1.0;
|
||
|
|
|
||
|
|
if (T<66.0)
|
||
|
|
{
|
||
|
|
red = 255.0;
|
||
|
|
green = T;
|
||
|
|
green = 99.4708025 * log(green) - 161.11956;
|
||
|
|
|
||
|
|
if (T <=19)
|
||
|
|
{blue = 0.0;}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
blue = T-10;
|
||
|
|
blue = 138.517731 * log(blue) - 305.044792;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
red = T - 60.0;
|
||
|
|
red = 329.6987 * pow(red, -0.1332047);
|
||
|
|
|
||
|
|
green = T - 60.0;
|
||
|
|
green = 288.122169 * pow(green, -0.075514);
|
||
|
|
|
||
|
|
blue = 255.0;
|
||
|
|
}
|
||
|
|
|
||
|
|
alpha = 0.8 * smoothstep(5.0, 15.0, T);
|
||
|
|
|
||
|
|
vec3 color = vec3 (red, green, blue);
|
||
|
|
color /= 255.0;
|
||
|
|
|
||
|
|
color = clamp(color, 0.0, 1.0);
|
||
|
|
|
||
|
|
return vec4 (color, alpha);
|
||
|
|
}
|