mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-08 01:10:27 +00:00
38 lines
863 B
GLSL
38 lines
863 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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vec3 colorA = vec3(0.149,0.141,0.912);
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vec3 colorB = vec3(1.000,0.833,0.224);
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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.xy;
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vec3 color = vec3(0.0);
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vec3 pct = vec3(st.x);
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// pct.r = smoothstep(0.0,1.0, st.x);
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// pct.g = sin(st.x*PI);
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// pct.b = pow(st.x,0.5);
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color = mix(colorA, colorB, pct);
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// Plot transition lines for each channel
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color = mix(color,vec3(1.0,0.0,0.0),plot(st,pct.r));
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color = mix(color,vec3(0.0,1.0,0.0),plot(st,pct.g));
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color = mix(color,vec3(0.0,0.0,1.0),plot(st,pct.b));
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gl_FragColor = vec4(color,1.0);
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}
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