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