[gnome-shell/gnome-3-38] blur-effect: Ensure float are used explictly

[Marge Bot <marge-bot src gnome org>]

commit 2fbd8e61cf16aaa09648dd822e13627047f10f96
Author: Frederic Crozat <fcrozat suse com>
Date:   Wed Mar 10 15:29:00 2021 +0100

    blur-effect: Ensure float are used explictly
    
    ceil(int) doesn't exist, we need to use an explicit float to prevent
    error when shader is compiled.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1750>

 src/shell-blur-effect.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/shell-blur-effect.c b/src/shell-blur-effect.c
index ca645112a6..fca4d011ca 100644
--- a/src/shell-blur-effect.c
+++ b/src/shell-blur-effect.c
@@ -99,7 +99,7 @@ static const gchar *gaussian_blur_glsl =
 "  vec4 ret = texture2D (cogl_sampler, uv) * gauss_coefficient.x;          \n"
 "  gauss_coefficient.xy *= gauss_coefficient.yz;                           \n"
 "                                                                          \n"
-"  int n_steps = int (ceil (3 * sigma));                                   \n"
+"  int n_steps = int (ceil (3.0 * sigma));                                 \n"
 "                                                                          \n"
 "  for (int i = 1; i < n_steps; i += 2) {                                  \n"
 "    float coefficient_subtotal = gauss_coefficient.x;                     \n"