[gtk/wip/baedert/for-master: 3/6] gl renderer: Adjust gaussian blur sigma

[Timm Bäder <baedert src gnome org>]

commit c1c2205018c738a5e96ee8a8922ebfe711c5ce1b
Author: Timm Bäder <mail baedert org>
Date:   Sat Aug 29 11:30:45 2020 +0200

    gl renderer: Adjust gaussian blur sigma
    
    To look more like what browsers do.

 gsk/resources/glsl/blur.glsl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gsk/resources/glsl/blur.glsl b/gsk/resources/glsl/blur.glsl
index 055b95cbf7..13bf588b0e 100644
--- a/gsk/resources/glsl/blur.glsl
+++ b/gsk/resources/glsl/blur.glsl
@@ -18,7 +18,7 @@ void main() {
   pixel_step = (vec2(1.0) / u_blur_size) * u_blur_dir;
   pixels_per_side = floor(u_blur_radius * RADIUS_MULTIPLIER / 2.0);
 
-  float sigma = u_blur_radius; // *shrug*
+  float sigma = u_blur_radius / 2.0; // *shrug*
   initial_gaussian.x = 1.0 / (sqrt(2.0 * PI) * sigma);
   initial_gaussian.y = exp(-0.5 / (sigma * sigma));
   initial_gaussian.z = initial_gaussian.y * initial_gaussian.y;