mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-15 18:13:59 +00:00
51 lines
1.3 KiB
GLSL
51 lines
1.3 KiB
GLSL
// Author @patriciogv - 2015
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// http://patriciogonzalezvivo.com
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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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float random (in float x) {
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return fract(sin(x)*1e4);
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}
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float random (in vec2 st) {
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return fract(sin(dot(st.xy, vec2(12.9898,78.233)))* 43758.5453123);
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}
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float pattern(vec2 st, vec2 v, float t) {
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vec2 p = floor(st+v);
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return step(t, random(100.+p*.000001)+random(p.x)*0.5 );
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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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st.x *= u_resolution.x/u_resolution.y;
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vec2 grid = vec2(100.0,50.);
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st *= grid;
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vec2 ivec = floor(st); // integer
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vec2 fvec = fract(st); // fraction
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vec2 vel = vec2(u_time*2.*max(grid.x,grid.y)); // time
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vel *= vec2(-1.,0.0) * random(1.0+ivec.y); // direction
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// vel *= (step(1., mod(ivec.y,2.0))-0.5)*2.; // Oposite directions
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// Assign a random value base on the integer coord
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vec2 offset = vec2(0.1,0.);
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vec3 color = vec3(0.);
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color.r = pattern(st+offset,vel,0.5+u_mouse.x/u_resolution.x);
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color.g = pattern(st,vel,0.5+u_mouse.x/u_resolution.x);
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color.b = pattern(st-offset,vel,0.5+u_mouse.x/u_resolution.x);
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// Margins
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// color *= step(0.2,fvec.y);
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gl_FragColor = vec4(1.0-color,1.0);
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} |