mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-01 21:40:27 +00:00
34 lines
726 B
GLSL
34 lines
726 B
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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uniform vec2 u_resolution;
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uniform vec2 u_mouse;
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uniform float u_time;
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// Function from Iñigo Quiles
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// www.iquilezles.org/www/articles/functions/functions.htm
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float cubicPulse( float c, float w, float x ){
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x = abs(x - c);
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if( x>w ) return 0.0;
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x /= w;
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return 1.0 - x*x*(3.0-2.0*x);
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}
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float plot(vec2 st, float pct){
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return smoothstep( pct-0.02, pct, st.y) -
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smoothstep( pct, pct+0.02, st.y);
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}
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution;
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float y = cubicPulse(0.5,0.2,st.x);
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vec3 color = vec3(y);
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float pct = plot(st,y);
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color = (1.0-pct)*color+pct*vec3(0.0,1.0,0.0);
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gl_FragColor = vec4(color,1.0);
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} |