lygia/v1.2.0/math/gain)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/
Use:
<float> gain(<float> x, <float> k)
#ifndef FNC_GAIN
#define FNC_GAIN
float gain(float x, float k) {
float a = 0.5 * pow(2.0*((x<0.5)? x : 1.0-x), k);
return (x < 0.5) ? a : 1.0-a;
}
#endif
Use:
<float> gain(<float> x, <float> k)
#ifndef FNC_GAIN
#define FNC_GAIN
float gain(float x, float k) {
const float a = 0.5*pow(2.0*((x<0.5)?x:1.0-x), k);
return (x<0.5)?a:1.0-a;
}
#endif
Dependencies:
Use:
<float> gain(<float> x, <float> k)
#ifndef FNC_GAIN
#define FNC_GAIN
inline __host__ __device__ float gain(float x, float k) {
const float a = 0.5f * pow(2.0f * ((x < 0.5f)? x : 1.0f - x), k);
return (x < 0.5f)? a : 1.0f - a;
}
#endif
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