31 lines
1.7 KiB
HLSL
31 lines
1.7 KiB
HLSL
// The MIT License
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// Copyright © 2015 Inigo Quilez
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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// and associated documentation files (the "Software"), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
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//subject to the following conditions: The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS",
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
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// OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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// CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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// OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// From https://www.shadertoy.com/view/4llXD7
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// Signed distance to a 2D rounded box with four individual corner sizes
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// p = position, b = box half width/height
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// r = corner radiuses (top right, bottom right, top left, bottom left)
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float sdRoundBox( in float2 p, in float2 b, in float4 r )
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{
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// We choose the radius based on the quadrant we're in
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// We cap the radius based on the minimum of the box half width/height
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r.xy = (p.x>0.0)?r.xy : r.zw;
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r.x = (p.y>0.0)?r.x : r.y;
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r.x = min(2.0f*r.x, min(b.x, b.y));
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float2 q = abs(p)-b+r.x;
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return min(max(q.x,q.y),0.0) + length(max(q,0.0)) - r.x;
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}
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