39 lines
1.1 KiB
GLSL
39 lines
1.1 KiB
GLSL
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/*
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2D LED Spectrum - Visualiser
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Based on Led Spectrum Analyser by: simesgreen - 27th February, 2013 https://www.shadertoy.com/view/Msl3zr
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2D LED Spectrum by: uNiversal - 27th May, 2015
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Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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*/
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void mainImage( out vec4 fragColor, in vec2 fragCoord )
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{
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// create pixel coordinates
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vec2 uv = fragCoord.xy / iResolution.xy;
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// quantize coordinates
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const float bands = 30.0;
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const float segs = 40.0;
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vec2 p;
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p.x = floor(uv.x*bands)/bands;
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p.y = floor(uv.y*segs)/segs;
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// read frequency data from first row of texture
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float fft = texture( iChannel0, vec2(p.x,0.0) ).x;
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// led color
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vec3 color = mix(vec3(0.0, 2.0, 0.0), vec3(2.0, 0.0, 0.0), sqrt(uv.y));
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// mask for bar graph
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float mask = (p.y < fft) ? 1.0 : 0.1;
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// led shape
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vec2 d = fract((uv - p) *vec2(bands, segs)) - 0.5;
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float led = smoothstep(0.5, 0.35, abs(d.x)) *
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smoothstep(0.5, 0.35, abs(d.y));
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vec3 ledColor = led*color*mask;
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// output final color
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fragColor = vec4(ledColor, 1.0);
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}
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