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MetaBackground: draw twice with different constants instead of blending with Cogl

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This is in preparation for having a more complex drawing sequence, which
would require custom attributes to implement with a single pass.
This commit is contained in:
Giovanni Campagna 2013-02-03 19:35:02 +01:00
parent b61e221e8f
commit 7332eb3db2
1 changed files with 60 additions and 68 deletions
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128
src/compositor/meta-background-actor.c
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@ -69,8 +69,6 @@ struct _MetaBackgroundActorPrivate
MetaBackground *background;
GSettings *settings;
CoglPipeline *single_pipeline;
CoglPipeline *crossfade_pipeline;
CoglPipeline *pipeline;
CoglMaterialWrapMode wrap_mode;
@ -182,25 +180,8 @@ update_actor_pipeline (MetaBackgroundActor *self,
{
MetaBackgroundActorPrivate *priv = self->priv;
if (crossfade)
{
priv->pipeline = priv->crossfade_pipeline;
priv->is_crossfading = TRUE;
cogl_pipeline_set_layer_texture (priv->pipeline, 0, priv->background->old_texture);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 0, priv->wrap_mode);
cogl_pipeline_set_layer_texture (priv->pipeline, 1, priv->background->texture);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 1, priv->wrap_mode);
}
else
{
priv->pipeline = priv->single_pipeline;
priv->is_crossfading = FALSE;
cogl_pipeline_set_layer_texture (priv->pipeline, 0, priv->background->texture);
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 0, priv->wrap_mode);
}
priv->is_crossfading = crossfade;
cogl_pipeline_set_layer_wrap_mode (priv->pipeline, 0, priv->wrap_mode);
clutter_actor_queue_redraw (CLUTTER_ACTOR (self));
}
@ -325,8 +306,7 @@ meta_background_actor_dispose (GObject *object)
priv->background = NULL;
}
g_clear_pointer (&priv->single_pipeline, cogl_object_unref);
g_clear_pointer (&priv->crossfade_pipeline, cogl_object_unref);
g_clear_pointer (&priv->pipeline, cogl_object_unref);
g_clear_object (&priv->settings);
G_OBJECT_CLASS (meta_background_actor_parent_class)->dispose (object);
@ -370,39 +350,14 @@ meta_background_actor_get_preferred_height (ClutterActor *actor,
}
static void
meta_background_actor_paint (ClutterActor *actor)
paint_background (MetaBackgroundActor *self)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
MetaBackgroundActorPrivate *priv = self->priv;
guint8 opacity = clutter_actor_get_paint_opacity (actor);
guint8 color_component;
int width, height;
CoglColor crossfade_color;
float width, height;
ClutterActorBox alloc;
meta_background_ensure_rendered (priv->background);
meta_screen_get_size (priv->screen, &width, &height);
color_component = (int)(0.5 + opacity * priv->dim_factor);
cogl_pipeline_set_color4ub (priv->pipeline,
color_component,
color_component,
color_component,
opacity);
if (priv->is_crossfading)
{
cogl_color_init_from_4f (&crossfade_color,
priv->crossfade_progress,
priv->crossfade_progress,
priv->crossfade_progress,
priv->crossfade_progress);
cogl_pipeline_set_layer_combine_constant (priv->pipeline,
1, &crossfade_color);
}
cogl_set_source (priv->pipeline);
clutter_actor_get_allocation_box (CLUTTER_ACTOR (self), &alloc);
clutter_actor_box_get_size (&alloc, &width, &height);
if (priv->visible_region)
{
@ -432,6 +387,53 @@ meta_background_actor_paint (ClutterActor *actor)
}
}
static void
meta_background_actor_paint (ClutterActor *actor)
{
MetaBackgroundActor *self = META_BACKGROUND_ACTOR (actor);
MetaBackgroundActorPrivate *priv = self->priv;
guint8 opacity = clutter_actor_get_paint_opacity (actor);
float crossfade_progress;
float first_color_factor, first_alpha_factor,
second_color_factor, second_alpha_factor;
meta_background_ensure_rendered (priv->background);
if (priv->is_crossfading)
crossfade_progress = priv->crossfade_progress;
else
crossfade_progress = 1.0;
first_color_factor = (opacity / 256.f) * priv->dim_factor * crossfade_progress;
first_alpha_factor = (opacity / 256.f) * crossfade_progress;
second_color_factor = (opacity / 256.f) * priv->dim_factor * (1 - crossfade_progress);
second_alpha_factor = (opacity / 256.f) * (1 - crossfade_progress);
cogl_set_source (priv->pipeline);
if (priv->is_crossfading)
{
cogl_pipeline_set_color4f (priv->pipeline,
second_color_factor,
second_color_factor,
second_color_factor,
second_alpha_factor);
cogl_pipeline_set_layer_texture (priv->pipeline, 0, priv->background->old_texture);
paint_background (self);
}
cogl_pipeline_set_color4f (priv->pipeline,
first_color_factor,
first_color_factor,
first_color_factor,
first_alpha_factor);
cogl_pipeline_set_layer_texture (priv->pipeline, 0, priv->background->texture);
paint_background (self);
}
static gboolean
meta_background_actor_get_paint_volume (ClutterActor *actor,
ClutterPaintVolume *volume)
@ -659,9 +661,7 @@ meta_background_actor_constructed (GObject *object)
priv->background = meta_background_get (priv->screen, priv->settings);
priv->background->actors = g_slist_prepend (priv->background->actors, self);
priv->single_pipeline = meta_create_texture_material (priv->background->texture);
priv->crossfade_pipeline = meta_create_crossfade_material (priv->background->old_texture,
priv->background->texture);
priv->pipeline = meta_create_texture_material (priv->background->texture);
if (priv->background->texture != COGL_INVALID_HANDLE)
update_actor_pipeline (self, FALSE);
@ -855,15 +855,11 @@ meta_background_actor_add_glsl_snippet (MetaBackgroundActor *actor,
if (hook == META_SNIPPET_HOOK_VERTEX ||
hook == META_SNIPPET_HOOK_FRAGMENT)
{
cogl_pipeline_add_snippet (priv->single_pipeline, snippet);
cogl_pipeline_add_snippet (priv->crossfade_pipeline, snippet);
cogl_pipeline_add_snippet (priv->pipeline, snippet);
}
else
{
/* In case of crossfading, apply the snippet only to the new texture.
We can't apply it to both because declarations would be doubled. */
cogl_pipeline_add_layer_snippet (priv->single_pipeline, 0, snippet);
cogl_pipeline_add_layer_snippet (priv->crossfade_pipeline, 1, snippet);
cogl_pipeline_add_layer_snippet (priv->pipeline, 0, snippet);
}
cogl_object_unref (snippet);
@ -898,12 +894,8 @@ meta_background_actor_set_uniform_float (MetaBackgroundActor *actor,
priv = actor->priv;
cogl_pipeline_set_uniform_float (priv->single_pipeline,
cogl_pipeline_get_uniform_location (priv->single_pipeline,
uniform_name),
n_components, count, uniform);
cogl_pipeline_set_uniform_float (priv->crossfade_pipeline,
cogl_pipeline_get_uniform_location (priv->crossfade_pipeline,
cogl_pipeline_set_uniform_float (priv->pipeline,
cogl_pipeline_get_uniform_location (priv->pipeline,
uniform_name),
n_components, count, uniform);
}