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36 lines
759 B
GLSL
36 lines
759 B
GLSL
// Author: Inigo Quiles
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// Title: Pcurve
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#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 pcurve( float x, float a, float b ){
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float k = pow(a+b,a+b) / (pow(a,a)*pow(b,b));
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return k * pow( x, a ) * pow( 1.0-x, b );
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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 = pcurve(st.x,3.0,1.0);
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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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}
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