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gldisplay: Add gst_gl_display_ensure_context

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See https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/issues/439

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3843>
This commit is contained in:
Anders Hellerup Madsen 2023-02-06 16:14:07 +01:00
parent 06b778e0a1
commit 0da0da69aa
2 changed files with 59 additions and 1 deletions
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54
subprojects/gst-plugins-base/gst-libs/gst/gl/gstgldisplay.c
View file

@ -1014,3 +1014,57 @@ gst_gl_display_remove_context (GstGLDisplay * display, GstGLContext * needle)
GST_WARNING_OBJECT (display, "%" GST_PTR_FORMAT " was not found in this "
"display", needle);
}
/**
* gst_gl_display_ensure_context:
* @display: a #GstGLDisplay
* @other_context: (transfer none)(nullable): other #GstGLContext to share resources with.
* @context: (inout)(transfer full)(nullable): the resulting #GstGLContext
* @error: (out)(transfer full)(nullable): possible error
*
* Ensures that the display has a valid GL context for the current thread. If
* @context already contains a valid context, this does nothing.
*
* Returns: wether @context contains a valid context.
*
* Since: 1.24
*/
gboolean
gst_gl_display_ensure_context (GstGLDisplay * display,
GstGLContext * other_context, GstGLContext ** context, GError ** error)
{
gboolean ret = FALSE;
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), FALSE);
g_return_val_if_fail (other_context == NULL
|| GST_IS_GL_CONTEXT (other_context), FALSE);
g_return_val_if_fail (context != NULL, FALSE);
g_return_val_if_fail (*context == NULL
|| GST_IS_GL_CONTEXT (*context), FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
if (*context && (*context)->display == display) {
return TRUE;
}
GST_OBJECT_LOCK (display);
do {
if (*context) {
gst_object_unref (*context);
*context = NULL;
}
/* just get a GL context. we don't care */
*context = gst_gl_display_get_gl_context_for_thread (display, NULL);
if (!*context) {
if (!gst_gl_display_create_context (display, other_context, &*context,
error)) {
goto out;
}
}
} while (!gst_gl_display_add_context (display, *context));
ret = TRUE;
out:
GST_OBJECT_UNLOCK (display);
return ret;
}

6
subprojects/gst-plugins-base/gst-libs/gst/gl/gstgldisplay.h
View file

@ -175,7 +175,11 @@ gboolean gst_gl_display_add_context (GstGLDisplay * display,
GST_GL_API
void gst_gl_display_remove_context (GstGLDisplay * display,
GstGLContext * context);
GST_GL_API
gboolean gst_gl_display_ensure_context (GstGLDisplay * display,
GstGLContext * other_context,
GstGLContext ** context,
GError ** error);
GST_GL_API
GstGLWindow * gst_gl_display_create_window (GstGLDisplay * display);
GST_GL_API