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lightbox: Fix banding issues with the vignette shader

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Just as https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/352
did for the MetaBackgroundActor in mutter, let's fix the vignette shader
in gnome-shell, too.

Based on a patch originally propsed by Nikita Churaev, see
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/59.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3942
(cherry picked from commit 81f62e9df8)

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2181>
This commit is contained in:
Jonas Dreßler 2022-01-27 17:48:20 +01:00 • committed by Florian Müllner
parent 6ef3431acd
commit 0fb2ee5bcc
1 changed files with 15 additions and 11 deletions
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26
js/ui/lightbox.js
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@ -9,18 +9,22 @@ var DEFAULT_FADE_FACTOR = 0.4;
var VIGNETTE_BRIGHTNESS = 0.5;
var VIGNETTE_SHARPNESS = 0.7;
const VIGNETTE_DECLARATIONS = '\
uniform float brightness;\n\
uniform float vignette_sharpness;\n';
const VIGNETTE_DECLARATIONS = ' \
uniform float brightness; \n\
uniform float vignette_sharpness; \n\
float rand(vec2 p) { \n\
return fract(sin(dot(p, vec2(12.9898, 78.233))) * 43758.5453123); \n\
} \n';
const VIGNETTE_CODE = ' \
cogl_color_out.a = cogl_color_in.a; \n\
cogl_color_out.rgb = vec3(0.0, 0.0, 0.0); \n\
vec2 position = cogl_tex_coord_in[0].xy - 0.5; \n\
float t = clamp(length(1.41421 * position), 0.0, 1.0); \n\
float pixel_brightness = mix(1.0, 1.0 - vignette_sharpness, t); \n\
cogl_color_out.a *= 1.0 - pixel_brightness * brightness; \n\
cogl_color_out.a += (rand(position) - 0.5) / 100.0; \n';
const VIGNETTE_CODE = '\
cogl_color_out.a = cogl_color_in.a;\n\
cogl_color_out.rgb = vec3(0.0, 0.0, 0.0);\n\
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 * (1.0 - pixel_brightness * brightness);';
var RadialShaderEffect = GObject.registerClass({
Properties: {