From 5e7f227d9244c4c375d3d04585177ee941fa4f40 Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Thu, 25 Jul 2024 15:22:24 +0200
Subject: [PATCH] gpu: Don't run long loops in shaders

If the border radius is too big, take bigger steps when computing the
shadow.

I randomly chose 8 because that looked good and was fast enough.
---
 gsk/gpu/shaders/gskgpuboxshadow.glsl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gsk/gpu/shaders/gskgpuboxshadow.glsl b/gsk/gpu/shaders/gskgpuboxshadow.glsl
index 8e26e43a35..5294e0b87d 100644
--- a/gsk/gpu/shaders/gskgpuboxshadow.glsl
+++ b/gsk/gpu/shaders/gskgpuboxshadow.glsl
@@ -112,7 +112,7 @@ blur_corner (vec2 p,
     return 0.0;
 
   float result = 0.0;
-  float step = 1.0;
+  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);