gl renderer: Fix inset shadow offset calculation

diff --git a/gsk/resources/glsl/inset_shadow.fs.glsl b/gsk/resources/glsl/inset_shadow.fs.glsl
index 4337dac4e930de338c9464c7189de241b0d65fdb..b6bb87c82a670f2a3e01f1bfeb392c4d7f0208cd 100644 (file)
--- a/gsk/resources/glsl/inset_shadow.fs.glsl
+++ b/gsk/resources/glsl/inset_shadow.fs.glsl
@@ -18,10 +18,10 @@ void main() {
   RoundedRect inside = rounded_rect_shrink(outline, vec4(u_spread));
 
 
-
+  vec2 offset = vec2(u_offset.x, - u_offset.y);
   vec4 color = vec4(u_color.rgb * u_color.a, u_color.a);
   color = color * clamp (rounded_rect_coverage (outline, f.xy) -
-                         rounded_rect_coverage (inside, f.xy + u_offset),
+                         rounded_rect_coverage (inside, f.xy - offset),
                          0.0, 1.0);
   setOutputColor(color);
 }