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// Reference here: http://www.mrao.cam.ac.uk/~dag/CUBEHELIX/ | |
skg_color128_t skg_col_helix128(float h, float s, float l, float alpha) { | |
const float tau = 6.28318f; | |
l = fminf(1,l); | |
float angle = tau * (h+(1/3.f)); | |
float amp = s * l * (1.f - l); | |
float a_cos = cosf(angle); | |
float a_sin = sinf(angle); | |
float r = l + amp * (-0.14861f * a_cos + 1.78277f * a_sin); |