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Implement non-linear overview shade for background

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Adding a radial gradent to the dimming effect gives more depth to
the background.
Shading is computed in a GLSL fragment shader, and uses distance to
center of the screen to interpolate the darkening value to use.

Based on a patch by Pierre-Eric Pelloux-Prayer <pelloux@gmail.com>

https://bugzilla.gnome.org/show_bug.cgi?id=669798
This commit is contained in:
Giovanni Campagna 2012-08-30 02:22:39 +02:00
parent b189cbd46e
commit 025c63c045
1 changed files with 23 additions and 1 deletions
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24
js/ui/overview.js
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@ -28,6 +28,24 @@ const DASH_MAX_WIDTH = 96;
const DND_WINDOW_SWITCH_TIMEOUT = 1250;
const GLSL_DIM_EFFECT_DECLARATIONS = '';
const GLSL_DIM_EFFECT_CODE = '\
vec2 dist = cogl_tex_coord_in[0].xy - vec2(0.5, 0.5); \
float elipse_radius = 0.5; \
/* from https://bugzilla.gnome.org/show_bug.cgi?id=669798: \
the alpha on the gradient goes from 165 at its darkest to 98 at its most transparent. */ \
float y = 165.0 / 255.0; \
float x = 98.0 / 255.0; \
/* interpolate darkening value, based on distance from screen center */ \
float val = min(length(dist), elipse_radius); \
float a = mix(x, y, val / elipse_radius); \
/* dim_factor varies from [1.0 -> 0.5] when overview is showing \
We use it to smooth value, then we clamp it to valid color interval */ \
a = clamp(a - cogl_color_in.r + 0.5, 0.0, 1.0); \
/* We\'re blending between: color and black color (obviously omitted in the equation) */ \
cogl_color_out.xyz = cogl_color_out.xyz * (1.0 - a); \
cogl_color_out.a = 1.0;';
const SwipeScrollDirection = {
NONE: 0,
HORIZONTAL: 1,
@ -119,6 +137,10 @@ const Overview = new Lang.Class({
// scenes which allows us to show the background with different
// rendering options without duplicating the texture data.
this._background = Meta.BackgroundActor.new_for_screen(global.screen);
this._background.add_glsl_snippet(Meta.SnippetHook.FRAGMENT,
GLSL_DIM_EFFECT_DECLARATIONS,
GLSL_DIM_EFFECT_CODE,
false);
this._background.hide();
global.overlay_group.add_actor(this._background);
@ -633,7 +655,7 @@ const Overview = new Lang.Class({
});
Tweener.addTween(this._background,
{ dim_factor: 0.4,
{ dim_factor: 0.8,
time: ANIMATION_TIME,
transition: 'easeOutQuad'
});