16 lines
No EOL
589 B
Text
16 lines
No EOL
589 B
Text
/*
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contributors: Inigo Quiles
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description: |
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Remapping the unit interval into the unit interval by expanding the sides and compressing the center, and keeping 1/2 mapped to 1/2, that can be done with the gain() function. From https://iquilezles.org/articles/functions/
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use: <float> gain(<float> x, <float> k)
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examples:
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- https://raw.githubusercontent.com/patriciogonzalezvivo/lygia_examples/main/math_functions.frag
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*/
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#ifndef FNC_GAIN
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#define FNC_GAIN
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float gain(float x, float k) {
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float a = 0.5 * pow(2.0*((x<0.5)? x : 1.0-x), k);
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return (x < 0.5) ? a : 1.0-a;
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}
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#endif |