mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-26 15:06:22 +01:00
26 lines
561 B
Text
26 lines
561 B
Text
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//
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// Simple passthrough fragment shader
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//
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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#define PI 3.14159265359
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uniform float strength;
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void main() {
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float inCircle = length(v_vTexcoord - vec2(0.5));
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if(inCircle > 0.5) {
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gl_FragColor = vec4(128. / 255., 128. / 255., 0., 0.);
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return;
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}
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vec2 pos = vec2(0.5) - v_vTexcoord;
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float rad = inCircle * 2.;
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float angle = atan(pos.y, pos.x);
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float dist = (1. - rad) * strength;
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gl_FragColor = vec4(128. / 255. + cos(angle) * 0.125 * dist, 128. / 255. + sin(angle) * 0.125 * dist, 0., 1.);
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}
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