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31 lines
528 B
GLSL
31 lines
528 B
GLSL
#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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#define PI 3.14159265359
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float circleSDF(vec2 st) {
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return length(st-.5)*2.;
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}
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float fill(float x, float size) {
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return 1.-step(size, x);
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}
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void main() {
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vec2 st = gl_FragCoord.xy/u_resolution;
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vec3 color = vec3(0.0,0.0,0.0);
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float alpha = 1.0;
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color += fill(circleSDF(st),.65);
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vec2 offset = vec2(.1,.05);
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color -= fill(circleSDF(st-offset),.5);
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gl_FragColor = vec4(color, alpha);
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}
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