64 lines
1.9 KiB
GLSL
64 lines
1.9 KiB
GLSL
|
|
#ifndef _SMOOTH_GLSL /* include gaurd */
|
|
#define _SMOOTH_GLSL
|
|
|
|
#ifndef TWOPI
|
|
#define TWOPI 6.28318530718
|
|
#endif
|
|
|
|
#ifndef PI
|
|
#define PI 3.14159265359
|
|
#endif
|
|
|
|
#include ":smooth_parameters.glsl"
|
|
|
|
/* window value t that resides in range [0, sz)*/
|
|
#define window(t, sz) (0.53836 - (0.46164 * cos(TWOPI * t / (sz - 1))))
|
|
/* this does nothing, but we keep it as an option for config */
|
|
#define linear(x) (x)
|
|
/* take value x that scales linearly between [0, 1) and return its sinusoidal curve */
|
|
#define sinusoidal(x) ((0.5 * sin((PI * (x)) - (PI / 2))) + 0.5)
|
|
/* take value x that scales linearly between [0, 1) and return its circlar curve */
|
|
#define circular(x) sqrt(1 - (((x) - 1) * ((x) - 1)))
|
|
|
|
float scale_audio(float idx) {
|
|
return -log((-(SAMPLE_RANGE) * idx) + 1) / (SAMPLE_SCALE);
|
|
}
|
|
|
|
float iscale_audio(float idx) {
|
|
return -log((SAMPLE_RANGE) * idx) / (SAMPLE_SCALE);
|
|
}
|
|
|
|
float smooth_audio(in sampler1D tex, int tex_sz, highp float idx, float r) {
|
|
float
|
|
smin = scale_audio(clamp(idx - r, 0, 1)) * tex_sz,
|
|
smax = scale_audio(clamp(idx + r, 0, 1)) * tex_sz,
|
|
avg = 0, s, weight = 0;
|
|
float m = ((smax - smin) / 2.0F);
|
|
float rm = smin + m; /* middle */
|
|
for (s = smin; s <= smax; s += 1.0F) {
|
|
float w = ROUND_FORMULA(clamp((m - abs(rm - s)) / m, 0, 1));
|
|
weight += w;
|
|
avg += texture(tex, float(s) / float(tex_sz)).r * w;
|
|
}
|
|
avg /= weight;
|
|
return avg;
|
|
}
|
|
|
|
/* Applies the audio smooth sampling function three times to the adjacent values */
|
|
float smooth_audio_adj(in sampler1D tex, int tex_sz, highp float idx, float r, highp float pixel) {
|
|
float
|
|
al = smooth_audio(tex, tex_sz, max(idx - pixel, 0.0F), r),
|
|
am = smooth_audio(tex, tex_sz, idx, r),
|
|
ar = smooth_audio(tex, tex_sz, min(idx + pixel, 1.0F), r);
|
|
return (al + am + ar) / 3.0F;
|
|
}
|
|
|
|
#ifdef TWOPI
|
|
#undef TWOPI
|
|
#endif
|
|
#ifdef PI
|
|
#undef PI
|
|
#endif
|
|
#endif /* _SMOOTH_GLSL */
|