17 lines
412 B
GLSL
17 lines
412 B
GLSL
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precision highp float; varying vec2 vPos;
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uniform vec2 p;
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uniform float r;
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const int I = 500;
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void main() {
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vec2 c = p + vPos * r, z = c;
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float n = 0.0;
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for (int i = I; i > 0; i --) {
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if(z.x*z.x+z.y*z.y > 4.0) {
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n = float(i)/float(I);
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break;
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}
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z = vec2(z.x*z.x-z.y*z.y, 2.0*z.x*z.y) + c;
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}
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gl_FragColor = vec4(0.5-cos(n*17.0)/2.0,0.5-cos(n*13.0)/2.0,0.5-cos(n*23.0)/2.0,1.0);
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}
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