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39 lines
959 B
GLSL
39 lines
959 B
GLSL
// Author @patriciogv - 2015 - patricio.io
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#extension GL_OES_standard_derivatives : enable
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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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float aastep(float threshold, float value) {
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#ifdef GL_OES_standard_derivatives
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float afwidth = length(vec2(dFdx(value), dFdy(value))) * 0.70710678118654757;
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return smoothstep(threshold-afwidth, threshold+afwidth, value);
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#else
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return step(threshold, value);
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#endif
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}
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mat2 rotate2d(float angle){
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return mat2(cos(angle),-sin(angle),
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sin(angle),cos(angle));
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}
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float stripes(vec2 st){
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st = rotate2d(.72)*st;
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st *= 92.;
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return aastep(.3,abs(sin(st.y*3.14159265358)));
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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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vec3 color = vec3(stripes(st));
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gl_FragColor = vec4(color, 1.0);
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}
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