From e38a41624679cee2331f460de36c3d8314a362c0 Mon Sep 17 00:00:00 2001
From: Daniel van Vugt <daniel.van.vugt@canonical.com>
Date: Tue, 25 Jan 2022 17:06:49 +0800
Subject: [PATCH] lightbox: GLSL requires real numbers, not integers

At least backward-compatible GLSL requires real numbers only. It's a
fatal shader compilation error to use integers in GLES and older GL
versions like that of i915.

Fixes: https://gitlab.gnome.org/GNOME/mutter/-/issues/2115
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2125>
---
 js/ui/lightbox.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/ui/lightbox.js b/js/ui/lightbox.js
index cf68ea828..08bf5641d 100644
--- a/js/ui/lightbox.js
+++ b/js/ui/lightbox.js
@@ -20,7 +20,7 @@ vec2 position = cogl_tex_coord_in[0].xy - 0.5;\n\
 float t = length(2.0 * position);\n\
 t = clamp(t, 0.0, 1.0);\n\
 float pixel_brightness = mix(1.0, 1.0 - vignette_sharpness, t);\n\
-cogl_color_out.a = cogl_color_out.a * (1 - pixel_brightness * brightness);';
+cogl_color_out.a = cogl_color_out.a * (1.0 - pixel_brightness * brightness);';
 
 var RadialShaderEffect = GObject.registerClass({
     Properties: {