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REVIEWED: audio_fft_spectrum_visualizer, not working on web

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Ray
2025-11-19 12:30:38 +01:00
parent e3738c1b17
commit 5fdf178969
5 changed files with 133 additions and 49 deletions
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32
examples/audio/resources/fft.glsl
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@ -1,32 +0,0 @@
#version 330
in vec2 fragTexCoord;
in vec4 fragColor;
out vec4 finalColor;
uniform vec2 iResolution;
uniform sampler2D iChannel0;
const vec4 BLACK = vec4(0.0, 0.0, 0.0, 1.0);
const vec4 WHITE = vec4(1.0, 1.0, 1.0, 1.0);
const float FFT_ROW = 0.0;
const float NUM_OF_BINS = 512.0;
void main() {
vec2 fragCoord = fragTexCoord*iResolution;
float cell_width = iResolution.x/NUM_OF_BINS;
float bin_index = floor(fragCoord.x/cell_width);
float local_x = mod(fragCoord.x, cell_width);
float bar_width = cell_width - 1.0;
vec4 color = BLACK;
if (local_x <= bar_width) {
float sample_x = (bin_index + 0.5)/NUM_OF_BINS;
vec2 sample_coord = vec2(sample_x, FFT_ROW);
float amplitude = texture(iChannel0, sample_coord).r; // only filled the red channel, all channels left open for alternative use
if (fragTexCoord.y < amplitude) {
color = WHITE;
}
}
finalColor = color;
}

37
examples/audio/resources/shaders/glsl100/fft.fs Normal file
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#version 100
precision mediump float;
// Input vertex attributes (from vertex shader)
varying vec2 fragTexCoord;
varying vec4 fragColor;
// Input uniform values
uniform vec2 iResolution;
uniform sampler2D iChannel0;
const vec4 BLACK = vec4(0.0, 0.0, 0.0, 1.0);
const vec4 WHITE = vec4(1.0, 1.0, 1.0, 1.0);
const float FFT_ROW = 0.0;
const float NUM_OF_BINS = 512.0;
void main()
{
vec2 fragCoord = fragTexCoord*iResolution;
float cellWidth = iResolution.x/NUM_OF_BINS;
float binIndex = floor(fragCoord.x/cellWidth);
float localX = mod(fragCoord.x, cellWidth);
float barWidth = cellWidth - 1.0;
vec4 color = WHITE;
if (localX <= barWidth)
{
float sampleX = (binIndex + 0.5)/NUM_OF_BINS;
vec2 sampleCoord = vec2(sampleX, FFT_ROW);
float amplitude = texture2D(iChannel0, sampleCoord).r; // Only filled the red channel, all channels left open for alternative use
if (fragTexCoord.y < amplitude) color = BLACK;
}
gl_FragColor = color;
}

35
examples/audio/resources/shaders/glsl120/fft.fs Normal file
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#version 120
// Input vertex attributes (from vertex shader)
varying vec2 fragTexCoord;
varying vec4 fragColor;
// Input uniform values
uniform vec2 iResolution;
uniform sampler2D iChannel0;
const vec4 BLACK = vec4(0.0, 0.0, 0.0, 1.0);
const vec4 WHITE = vec4(1.0, 1.0, 1.0, 1.0);
const float FFT_ROW = 0.0;
const float NUM_OF_BINS = 512.0;
void main()
{
vec2 fragCoord = fragTexCoord*iResolution;
float cellWidth = iResolution.x/NUM_OF_BINS;
float binIndex = floor(fragCoord.x/cellWidth);
float localX = mod(fragCoord.x, cellWidth);
float barWidth = cellWidth - 1.0;
vec4 color = WHITE;
if (localX <= barWidth)
{
float sampleX = (binIndex + 0.5)/NUM_OF_BINS;
vec2 sampleCoord = vec2(sampleX, FFT_ROW);
float amplitude = texture2D(iChannel0, sampleCoord).r; // Only filled the red channel, all channels left open for alternative use
if (fragTexCoord.y < amplitude) color = BLACK;
}
gl_FragColor = color;
}

35
examples/audio/resources/shaders/glsl330/fft.fs Normal file
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@ -0,0 +1,35 @@
#version 330
in vec2 fragTexCoord;
in vec4 fragColor;
out vec4 finalColor;
uniform vec2 iResolution;
uniform sampler2D iChannel0;
const vec4 BLACK = vec4(0.0, 0.0, 0.0, 1.0);
const vec4 WHITE = vec4(1.0, 1.0, 1.0, 1.0);
const float FFT_ROW = 0.0;
const float NUM_OF_BINS = 512.0;
void main()
{
vec2 fragCoord = fragTexCoord*iResolution;
float cellWidth = iResolution.x/NUM_OF_BINS;
float binIndex = floor(fragCoord.x/cellWidth);
float localX = mod(fragCoord.x, cellWidth);
float barWidth = cellWidth - 1.0;
vec4 color = WHITE;
if (localX <= barWidth)
{
float sampleX = (binIndex + 0.5)/NUM_OF_BINS;
vec2 sampleCoord = vec2(sampleX, FFT_ROW);
float amplitude = texture(iChannel0, sampleCoord).r; // Only filled the red channel, all channels left open for alternative use
if (fragTexCoord.y < amplitude) color = BLACK;
}
finalColor = color;
}