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