mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-26 15:06:22 +01:00
28 lines
646 B
GLSL
28 lines
646 B
GLSL
varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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uniform vec4 color;
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uniform float angle;
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uniform vec2 amount;
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float sdArc( in vec2 p, in float tb, in float ra, float rb ) {
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vec2 sc = vec2(sin(tb), cos(tb));
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p.x = abs(p.x);
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return ((sc.y*p.x>sc.x*p.y) ? length(p-sc*ra) :
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abs(length(p)-ra)) - rb;
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}
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void main() {
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vec2 p = v_vTexcoord - .5;
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p *= mat2(cos(angle), -sin(angle), sin(angle), cos(angle)) * 1.5;
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float dist = 1. - sdArc(p, .6, .5, 0.) * 2. - 0.4;
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float a;
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vec4 c = vec4(0.);
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a = smoothstep(amount.x, amount.y, dist);
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c = mix(c, color, a);
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gl_FragColor = c;
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}
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