fft_fragment_program_resolve.glsl.frag.h

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#include "shaders_common.h"

static const char *fft_fragment_program_resolve = GLSL_300(
 precision mediump float;
 precision highp int;
 precision highp usampler2D;
 precision highp isampler2D;
 in vec2 vTex;
 out vec4 FragColor;
 uniform usampler2D sFFT;

 vec4 get_heights(highp uvec2 h) {
 vec2 l = unpackHalf2x16(h.x);
 vec2 r = unpackHalf2x16(h.y);
 vec2 channels[4] = vec2[4](
 l, 0.5 * (l + r), r, 0.5 * (l - r));
 vec4 amps;
 for (int i = 0; i < 4; i++)
 amps[i] = dot(channels[i], channels[i]);

 return 9.0 * log(amps + 0.0001) - 22.0;
 }

 void main() {
 uvec2 h = textureLod(sFFT, vTex, 0.0).rg;
 vec4 height = get_heights(h);
 height = (height + 40.0) / 80.0;
 FragColor = height;
 }
);