mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-10-27 03:46:31 +00:00
28 lines
579 B
GLSL
28 lines
579 B
GLSL
#ifdef GL_ES
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precision mediump float;
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#endif
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#define PI 3.14159265359
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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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float plot(vec2 _st, float _pct){
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return smoothstep( _pct-0.01, _pct, _st.y) -
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smoothstep( _pct, _pct+0.01, _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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// Everthins is over 0.5 will be 1.0 the rest 0.0
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float y = smoothstep(0.1,0.9,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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} |