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47 lines
1.0 KiB
GLSL
47 lines
1.0 KiB
GLSL
// Author @patriciogv - 2015 - patricio.io
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#ifdef GL_ES
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precision mediump float;
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#endif
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const float PI = 3.1415926535897932384626433832795;
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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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vec2 movingTiles(vec2 _st, float _zoom, float _speed){
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_st *= _zoom;
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float time = u_time*_speed;
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if( fract(time)>0.5 ){
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if (fract( _st.y * 0.5) > 0.5){
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_st.x += fract(time)*2.0;
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} else {
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_st.x -= fract(time)*2.0;
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}
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} else {
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if (fract( _st.x * 0.5) > 0.5){
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_st.y += fract(time)*2.0;
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} else {
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_st.y -= fract(time)*2.0;
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}
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}
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return fract(_st);
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}
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float circle(vec2 _st, float _radius){
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vec2 pos = vec2(0.5)-_st;
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return smoothstep(1.0-_radius,1.0-_radius+_radius*0.2,1.-dot(pos,pos)*3.14);
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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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st = movingTiles(st,10.,0.5);
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vec3 color = vec3( 1.0-circle(st, 0.3 ) );
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gl_FragColor = vec4(color,1.0);
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}
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