17 lines
327 B
GLSL
17 lines
327 B
GLSL
#ifndef _RECT_FRAG_
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#define _RECT_FRAG_
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#include "rect.glsl"
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float
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rect_coverage (Rect r, vec2 p)
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{
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vec2 dFdp = abs(fwidth (p));
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Rect prect = Rect(vec4(p - 0.5 * dFdp, p + 0.5 * dFdp));
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Rect coverect = rect_intersect (r, prect);
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vec2 coverage = rect_size(coverect) / dFdp;
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return coverage.x * coverage.y;
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}
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#endif
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