24 lines
680 B
GLSL
24 lines
680 B
GLSL
/*
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contributors: Ian Heisters
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description: Transforms the input signal into a triangle wave. For instance, if x goes between 0 and 2, the returned value will go from 0 to 1, and then 1 to 0 in a triangle shape.
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use: <float|vec2> mirror(<float|vec2> x)
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examples:
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- https://raw.githubusercontent.com/patriciogonzalezvivo/lygia_examples/main/math_functions.frag
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*/
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#ifndef FNC_MIRROR
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#define FNC_MIRROR
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float mirror(in float x) {
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float f = fract(x);
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float m = floor(mod(x, 2.));
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float fm = f * m;
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return f + m - fm * 2.;
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}
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vec2 mirror(in vec2 v) {
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vec2 f = fract(v);
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vec2 m = floor(mod(v, 2.));
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vec2 fm = f * m;
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return f + m - fm * 2.;
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}
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#endif
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