26 lines
729 B
GLSL
26 lines
729 B
GLSL
/*
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contributors: Patricio Gonzalez Vivo
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description: Returns a triangle-shaped sdf
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use: triSDF(<vec2> st)
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options:
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- CENTER_2D: vec2, defaults to vec2(.5)
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examples:
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- https://raw.githubusercontent.com/patriciogonzalezvivo/lygia_examples/main/draw_shapes.frag
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#ifndef FNC_TRISDF
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#define FNC_TRISDF
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float triSDF(in vec2 st) {
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#ifdef CENTER_2D
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st -= CENTER_2D;
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st *= 5.0;
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#else
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st -= 0.5;
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st *= 5.0;
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#endif
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return max(abs(st.x) * .866025 + st.y * .5, -st.y * 0.5);
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}
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#endif
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