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MetaBackgroundActor: add a setter for GLSL uniforms

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It doesn't make sense to GLSL shaders without uniforms.

https://bugzilla.gnome.org/show_bug.cgi?id=682536
This commit is contained in:
Giovanni Campagna 2012-11-07 19:00:25 +01:00
parent 6004197064
commit e73946f0bf
2 changed files with 42 additions and 0 deletions
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35
src/compositor/meta-background-actor.c
View File

@ -668,3 +668,38 @@ meta_background_actor_add_glsl_snippet (MetaBackgroundActor *actor,
cogl_object_unref (snippet);
}
/**
* meta_background_actor_set_uniform_float:
* @actor: a #MetaBackgroundActor
* @uniform_name:
* @n_components: number of components (for vector uniforms)
* @count: number of uniforms (for array uniforms)
* @uniform: (array length=uniform_length): the float values to set
* @uniform_length: the length of @uniform. Must be exactly @n_components x @count,
* and is provided mainly for language bindings.
*
* Sets a new GLSL uniform to the provided value. This is mostly
* useful in congiunction with meta_background_actor_add_glsl_snippet().
*/
void
meta_background_actor_set_uniform_float (MetaBackgroundActor *actor,
const char *uniform_name,
int n_components,
int count,
const float *uniform,
int uniform_length)
{
MetaBackgroundActorPrivate *priv;
g_return_if_fail (META_IS_BACKGROUND_ACTOR (actor));
g_return_if_fail (uniform_length == n_components * count);
priv = actor->priv;
cogl_pipeline_set_uniform_float (priv->pipeline,
cogl_pipeline_get_uniform_location (priv->pipeline,
uniform_name),
n_components, count, uniform);
}

7
src/meta/meta-background-actor.h
View File

@ -90,4 +90,11 @@ void meta_background_actor_add_glsl_snippet (MetaBackgroundActor *actor,
const char *code,
gboolean is_replace);
void meta_background_actor_set_uniform_float (MetaBackgroundActor *actor,
const char *uniform_name,
int n_components,
int count,
const float *uniform,
int uniform_length);
#endif /* META_BACKGROUND_ACTOR_H */