Created
July 30, 2017 16:52
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glsl fun example
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| #ifdef GL_ES | |
| precision mediump float; | |
| #endif | |
| uniform vec2 u_resolution; | |
| #define PI 3.14159265358979 | |
| uniform float u_time; | |
| float stroke(float x, float s, float w) { | |
| float d = step(s,x+w*.5)-step(s,x-w*.5); | |
| return clamp(d,0.,1.); | |
| } | |
| void main() { | |
| vec3 color = vec3(0.); | |
| vec2 st = gl_FragCoord.xy/u_resolution; | |
| float offset = cos((.3*u_time+st.y)*PI*10.)*.05; | |
| float width = 0.02+0.08*abs(cos(u_time*PI)); | |
| color += stroke(st.x,.28+offset,width); | |
| color += stroke(st.x,.5 +offset,width); | |
| color += stroke(st.x,.72+offset,width); | |
| gl_FragColor = vec4(color,1.); | |
| } |
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| <html> | |
| <head> | |
| <title>pixel spirit deck fun</title> | |
| </head> | |
| <body> | |
| <canvas class="glslCanvas" data-fragment-url="glsl.frag" width="700" height="600" style="border: 1px solid #333"></canvas> | |
| <script type="text/javascript" src="https://rawgit.com/patriciogonzalezvivo/glslCanvas/master/build/GlslCanvas.js"></script> | |
| </body> | |
| </html> |
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