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glcontext: add gst_gl_context_can_share

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Which determines whether two GstGLContext's can share sharable
OpenGL resources.
This commit is contained in:
Matthew Waters 2014-09-23 12:01:04 +10:00
parent 229e9911cb
commit d99b517b53
3 changed files with 55 additions and 3 deletions
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1
docs/libs/gst-plugins-bad-libs-sections.txt
View file

@ -805,6 +805,7 @@ gst_gl_context_get_gl_api
gst_gl_context_get_gl_context
gst_gl_context_get_gl_platform
gst_gl_context_get_thread
gst_gl_context_can_share
gst_gl_context_check_feature
gst_gl_context_check_gl_version
gst_gl_context_get_gl_version

56
gst-libs/gst/gl/gstglcontext.c
View file

@ -149,7 +149,7 @@ struct _GstGLContextPrivate
gboolean created;
gboolean alive;
GstGLContext *other_context;
GWeakRef other_context_ref;
GError **error;
gint gl_major;
@ -217,6 +217,8 @@ gst_gl_context_init (GstGLContext * context)
g_cond_init (&context->priv->create_cond);
g_cond_init (&context->priv->destroy_cond);
context->priv->created = FALSE;
g_weak_ref_init (&context->priv->other_context_ref, NULL);
}
static void
@ -382,6 +384,7 @@ gst_gl_context_finalize (GObject * object)
g_cond_clear (&context->priv->create_cond);
g_free (context->priv->gl_exts);
g_weak_ref_clear (&context->priv->other_context_ref);
G_OBJECT_CLASS (gst_gl_context_parent_class)->finalize (object);
}
@ -577,6 +580,47 @@ gst_gl_context_get_window (GstGLContext * context)
return gst_object_ref (context->window);
}
static gboolean
_share_group_descendant (GstGLContext * context, GstGLContext * other_context)
{
GstGLContext *next = gst_object_ref (context);
while (next != NULL) {
GstGLContext *prev;
if (next == other_context) {
gst_object_unref (next);
return TRUE;
}
prev = next;
next = g_weak_ref_get (&next->priv->other_context_ref);
gst_object_unref (prev);
}
return FALSE;
}
/**
* gst_gl_context_can_share:
* @context: a #GstGLContext
* @other_context: another #GstGLContext
*
* Returns: whether @context and @other_context are able to share OpenGL
* resources.
*
* Since: 1.6
*/
gboolean
gst_gl_context_can_share (GstGLContext * context, GstGLContext * other_context)
{
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), FALSE);
g_return_val_if_fail (GST_GL_IS_CONTEXT (other_context), FALSE);
return context == other_context
|| _share_group_descendant (context, other_context)
|| _share_group_descendant (other_context, context);
}
/**
* gst_gl_context_create:
* @context: a #GstGLContext:
@ -607,7 +651,7 @@ gst_gl_context_create (GstGLContext * context,
g_mutex_lock (&context->priv->render_lock);
if (!context->priv->created) {
context->priv->other_context = other_context;
g_weak_ref_set (&context->priv->other_context_ref, other_context);
context->priv->error = error;
context->priv->gl_thread = g_thread_new ("gstglcontext",
@ -889,7 +933,7 @@ gst_gl_context_create_thread (GstGLContext * context)
g_mutex_lock (&context->priv->render_lock);
error = context->priv->error;
other_context = context->priv->other_context;
other_context = g_weak_ref_get (&context->priv->other_context_ref);
context_class = GST_GL_CONTEXT_GET_CLASS (context);
window_class = GST_GL_WINDOW_GET_CLASS (context->window);
@ -1024,6 +1068,9 @@ gst_gl_context_create_thread (GstGLContext * context)
#endif
}
if (other_context)
gst_object_unref (other_context);
g_cond_signal (&context->priv->create_cond);
// g_mutex_unlock (&context->priv->render_lock);
@ -1059,6 +1106,9 @@ gst_gl_context_create_thread (GstGLContext * context)
failure:
{
if (other_context)
gst_object_unref (other_context);
g_cond_signal (&context->priv->create_cond);
g_mutex_unlock (&context->priv->render_lock);
return NULL;

1
gst-libs/gst/gl/gstglcontext.h
View file

@ -127,6 +127,7 @@ gpointer gst_gl_context_get_proc_address (GstGLContext *context, const gcha
GstGLPlatform gst_gl_context_get_gl_platform (GstGLContext *context);
GstGLAPI gst_gl_context_get_gl_api (GstGLContext *context);
guintptr gst_gl_context_get_gl_context (GstGLContext *context);
gboolean gst_gl_context_can_share (GstGLContext * context, GstGLContext *other_context);
gboolean gst_gl_context_create (GstGLContext *context, GstGLContext *other_context, GError ** error);
void gst_gl_context_destroy (GstGLContext *context);