27 lines
No EOL
905 B
GLSL
27 lines
No EOL
905 B
GLSL
/*
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contributors: Patricio Gonzalez Vivo
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description: make some hexagonal tiles. XY provide coordenates of the tile. While Z provides the distance to the center of the tile
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use: <vec4> hexTile(<vec2> st)
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examples:
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- https://raw.githubusercontent.com/patriciogonzalezvivo/lygia_examples/main/draw_tiles.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_HEXTILE
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#define FNC_HEXTILE
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vec4 hexTile(vec2 st) {
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vec2 s = vec2(1., 1.7320508);
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vec2 o = vec2(.5, 1.);
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st = st.yx;
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vec4 i = floor(vec4(st,st-o)/s.xyxy)+.5;
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vec4 f = vec4(st-i.xy*s, st-(i.zw+.5)*s);
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return dot(f.xy,f.xy) < dot(f.zw,f.zw) ?
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vec4(f.yx+.5, i.xy):
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vec4(f.wz+.5, i.zw+o);
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}
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#endif |