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glcontext: detect the sharegroup case where the context are in different chains

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In the end they will lead to the same root context in the tree so check that
for equality.
This commit is contained in:
Matthew Waters 2014-09-29 00:24:28 +10:00
parent eae09179f0
commit 3b9893192c
1 changed files with 31 additions and 5 deletions
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36
gst-libs/gst/gl/gstglcontext.c
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@ -581,14 +581,33 @@ gst_gl_context_get_window (GstGLContext * context)
}
static gboolean
_share_group_descendant (GstGLContext * context, GstGLContext * other_context)
_share_group_descendant (GstGLContext * context, GstGLContext * other_context,
GstGLContext ** root)
{
GstGLContext *next = gst_object_ref (context);
while (next != NULL) {
GstGLContext *prev;
GstGLContext *prev;
/* given a context tree where --> means "has other gl context":
*
* a-->b-->c-->d
* / /
* e /
* /
* f-->g
*
* return TRUE if @other_context is a descendant of @context
*
* e.g. [a, b], [f, d], [e, c] are all descendants
* but [b, a], [f, d], [e, f] are not descendants. Provide the root node (d)
* so that we can check if two chains end up at the end with the same
* GstGLContext
*/
while (next != NULL) {
if (next == other_context) {
gst_object_unref (next);
if (root)
*root = NULL;
return TRUE;
}
@ -597,6 +616,9 @@ _share_group_descendant (GstGLContext * context, GstGLContext * other_context)
gst_object_unref (prev);
}
if (root != NULL)
*root = prev;
return FALSE;
}
@ -613,12 +635,16 @@ _share_group_descendant (GstGLContext * context, GstGLContext * other_context)
gboolean
gst_gl_context_can_share (GstGLContext * context, GstGLContext * other_context)
{
GstGLContext *root1, *root2;
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), FALSE);
g_return_val_if_fail (GST_GL_IS_CONTEXT (other_context), FALSE);
/* check if the contexts are descendants or the root nodes are the same */
return context == other_context
|| _share_group_descendant (context, other_context)
|| _share_group_descendant (other_context, context);
|| _share_group_descendant (context, other_context, &root1)
|| _share_group_descendant (other_context, context, &root2)
|| ((root1 != NULL || root2 != NULL) && root1 == root2);
}
/**