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compositor: fix background vignette for non-stretched styles

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The background vignette currently fits itself to the painted
texture, instead of the monitor.  This causes some very
wrong looking drawing for backgrounds that don't fill the screen.

This commit reworks the vignette shader code to be clearer, more
correct, and parameterized so that it knows how to scale and
position the vignette.

https://bugzilla.gnome.org/show_bug.cgi?id=694393
This commit is contained in:
Ray Strode 2013-02-24 21:24:54 -05:00
parent 0e3d164117
commit 6e831c88a6
1 changed files with 46 additions and 4 deletions
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50
src/compositor/meta-background.c
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@ -64,14 +64,16 @@
"cogl_texel = apply_blur(cogl_sampler, cogl_tex_coord.st);\n"
#define FRAGMENT_SHADER_DECLARATIONS \
"uniform vec2 texture_scale;\n" \
"uniform vec2 actor_size;\n" \
"uniform vec2 offset;\n" \
"uniform float brightness;\n" \
"uniform float vignette_sharpness;\n" \
#define VIGNETTE_CODE \
"float unit_length = 0.5;\n" \
"vec2 center = vec2(unit_length, unit_length);\n" \
"vec2 position = cogl_tex_coord_in[0].xy - center;\n" \
"float t = min(length(position), unit_length) / unit_length;\n" \
"vec2 position = cogl_tex_coord_in[0].xy * texture_scale - offset;\n" \
"float t = length(2.0 * (position / actor_size));\n" \
"t = clamp(t, 0.0, 1.0);\n" \
"float pixel_brightness = mix(1.0, 1.0 - vignette_sharpness, t);\n" \
"cogl_color_out.rgb = cogl_color_out.rgb * pixel_brightness * brightness;\n"
@ -373,6 +375,44 @@ set_blur_parameters (MetaBackground *self,
2, 1, pixel_step);
}
static void
set_vignette_parameters (MetaBackground *self,
ClutterActorBox *actor_box,
cairo_rectangle_int_t *texture_area,
float texture_x_scale,
float texture_y_scale)
{
MetaBackgroundPrivate *priv = self->priv;
float texture_scale[2];
float actor_size[2];
float offset[2];
if (!(priv->effects & META_BACKGROUND_EFFECTS_VIGNETTE))
return;
texture_scale[0] = 1.0 / texture_x_scale;
texture_scale[1] = 1.0 / texture_y_scale;
actor_size[0] = actor_box->x2 - actor_box->x1;
actor_size[1] = actor_box->y2 - actor_box->y1;
offset[0] = -texture_area->x + (actor_size[0] / 2.0);
offset[1] = -texture_area->y + (actor_size[1] / 2.0);
cogl_pipeline_set_uniform_float (priv->pipeline,
cogl_pipeline_get_uniform_location (priv->pipeline,
"texture_scale"),
2, 1, texture_scale);
cogl_pipeline_set_uniform_float (priv->pipeline,
cogl_pipeline_get_uniform_location (priv->pipeline,
"actor_size"),
2, 1, actor_size);
cogl_pipeline_set_uniform_float (priv->pipeline,
cogl_pipeline_get_uniform_location (priv->pipeline,
"offset"),
2, 1, offset);
}
static void
meta_background_paint_content (ClutterContent *content,
ClutterActor *actor,
@ -408,6 +448,8 @@ meta_background_paint_content (ClutterContent *content,
&texture_x_scale,
&texture_y_scale);
set_vignette_parameters (self, &actor_box, &texture_area, texture_x_scale, texture_y_scale);
/* Now figure out what to actually paint. We start by clipping the texture area to
* the actor's bounds.
*/