mirror of
https://github.com/bvanroll/shaders.git
synced 2025-08-28 19:42:49 +00:00
42 lines
1.1 KiB
GLSL
42 lines
1.1 KiB
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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const vec3 uAColor = vec3(.5,.5,.5);
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const vec3 uBColor = vec3(.5,.5,.5);
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const vec3 uCColor = vec3(1.,1.,1.);
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const vec3 uDColor = vec3(.0,.33,.67);
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//get colors from http://dev.thi.ng/gradients/
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vec3 cosPalette(float t) { return uAColor + uBColor*cos(6.28318*(uCColor*t+uDColor)); }
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float fill(float x, float size) { return 1.-step(size, x); }
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float polySDF(vec2 st, float angles) {
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st = st*2.-1.;
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float a = atan(st.x,st.y)+PI;
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float r = length(st);
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float v = (2.*PI)/angles;
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return cos(floor(.5+a/v)*v-a)*r;
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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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float d1 = polySDF(st,5.);
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vec2 ts = vec2(st.x,1.-st.y); //flips the y coords, interesting name btw
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float d2 = polySDF(ts,5.);
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//color += fract(d1*3.);
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color += fill(d1,.75)*fill(fract(d1*5.),.5);
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color -= fill(d1,.6)*fill(fract(d2*4.9),.45);
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//color = vec3(fill(fract(d1*10.),.5));
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gl_FragColor = vec4(color, alpha);
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}
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