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gpu: Simplify box-shadow shader

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Instead of doing complicated math, normalize the values to a sigma
of 1.0, and then use that.
This should also be beneficial for shader performance, because 1.0 is a
constant and constant-elimination can kick in on the inlined functions.
This commit is contained in:
Benjamin Otte 2024-07-29 17:33:34 +02:00
parent 50bb42f0f3
commit 5059ae1d7b
1 changed files with 3 additions and 1 deletions
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4
gsk/gpu/shaders/gskgpuboxshadow.glsl
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@ -111,12 +111,14 @@ blur_corner (vec2 p,
if (min (r.x, r.y) <= 0.0)
return 0.0;
p /= _sigma;
r /= _sigma;
float result = 0.0;
float step = max (1.0, r.y / 8.0);
for (float y = 0.5 * step; y <= r.y; y += step)
{
float x = r.x - ellipse_x (r, r.y - y);
result -= gauss (p.y - y, _sigma.y) * erf_range (vec2 (- p.x, x - p.x), _sigma.x);
result -= gauss (p.y - y, 1.0) * erf_range (vec2 (- p.x, x - p.x), 1.0);
}
return result;
}