20 lines
No EOL
634 B
HLSL
20 lines
No EOL
634 B
HLSL
/*
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contributors: Patricio Gonzalez Vivo
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description: returns a coordinate of a sprite cell
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use: <float2> sprite(<float2> st, <float2> grid, <float> index)
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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_SPRITE
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#define FNC_SPRITE
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float2 sprite(float2 st, float2 grid, float index) {
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float2 f = 1.0/grid;
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float2 cell = float2(floor(index), floor(index * f.x) );
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cell.y = grid.y - cell.y;
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return frac( (st+cell)*f );
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}
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#endif |