gstreamer/gst-libs/gst/gl/gstgldisplay.c

921 lines
25 KiB
C

/*
* GStreamer
* Copyright (C) 2007 David A. Schleef <ds@schleef.org>
* Copyright (C) 2008 Julien Isorce <julien.isorce@gmail.com>
* Copyright (C) 2008 Filippo Argiolas <filippo.argiolas@gmail.com>
* Copyright (C) 2013 Matthew Waters <ystreet00@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstgldisplay
* @short_description: window system display connection abstraction
* @title: GstGLDisplay
* @see_also: #GstContext, #GstGLContext, #GstGLWindow
*
* #GstGLDisplay represents a connection to the underlying windowing system.
* Elements are required to make use of #GstContext to share and propagate
* a #GstGLDisplay.
*
* There are a number of environment variables that influence the choice of
* platform and window system specific functionality.
* - GST_GL_WINDOW influences the window system to use. Common values are
* 'x11', 'wayland', 'win32' or 'cocoa'.
* - GST_GL_PLATFORM influences the OpenGL platform to use. Common values are
* 'egl', 'glx', 'wgl' or 'cgl'.
* - GST_GL_API influences the OpenGL API requested by the OpenGL platform.
* Common values are 'opengl', 'opengl3' and 'gles2'.
*
* > Certain window systems require a special function to be called to
* > initialize threading support. As this GStreamer GL library does not preclude
* > concurrent access to the windowing system, it is strongly advised that
* > applications ensure that threading support has been initialized before any
* > other toolkit/library functionality is accessed. Failure to do so could
* > result in sudden application abortion during execution. The most notably
* > example of such a function is X11's XInitThreads\().
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gl.h"
#include "gstgldisplay.h"
#if GST_GL_HAVE_WINDOW_COCOA
#include <gst/gl/cocoa/gstgldisplay_cocoa.h>
#endif
#if GST_GL_HAVE_WINDOW_X11
#include <gst/gl/x11/gstgldisplay_x11.h>
#endif
#if GST_GL_HAVE_WINDOW_WAYLAND
#include <gst/gl/wayland/gstgldisplay_wayland.h>
#endif
#if GST_GL_HAVE_PLATFORM_EGL
#include <gst/gl/egl/gstgldisplay_egl.h>
#include <gst/gl/egl/gstgldisplay_egl_device.h>
#include <gst/gl/egl/gsteglimage.h>
#include <gst/gl/egl/gstglmemoryegl.h>
#endif
#if GST_GL_HAVE_WINDOW_VIV_FB
#include <gst/gl/viv-fb/gstgldisplay_viv_fb.h>
#endif
#if GST_GL_HAVE_WINDOW_GBM
#include <gst/gl/gbm/gstgldisplay_gbm.h>
#endif
GST_DEBUG_CATEGORY_STATIC (gst_context);
GST_DEBUG_CATEGORY_STATIC (gst_gl_display_debug);
#define GST_CAT_DEFAULT gst_gl_display_debug
enum
{
SIGNAL_0,
CREATE_CONTEXT,
LAST_SIGNAL
};
static guint gst_gl_display_signals[LAST_SIGNAL] = { 0 };
static void gst_gl_display_dispose (GObject * object);
static void gst_gl_display_finalize (GObject * object);
static guintptr gst_gl_display_default_get_handle (GstGLDisplay * display);
static gboolean gst_gl_display_default_get_foreign_display (GstGLDisplay *
display);
static GstGLWindow *gst_gl_display_default_create_window (GstGLDisplay *
display);
struct _GstGLDisplayPrivate
{
GstGLAPI gl_api;
GList *contexts;
GThread *event_thread;
GMutex thread_lock;
GCond thread_cond;
GMutex window_lock;
};
#define DEBUG_INIT \
GST_DEBUG_CATEGORY_INIT (gst_gl_display_debug, "gldisplay", 0, "opengl display"); \
GST_DEBUG_CATEGORY_GET (gst_context, "GST_CONTEXT");
G_DEFINE_TYPE_WITH_CODE (GstGLDisplay, gst_gl_display, GST_TYPE_OBJECT,
G_ADD_PRIVATE (GstGLDisplay)
DEBUG_INIT);
static gboolean
_unlock_main_thread (GstGLDisplay * display)
{
g_mutex_unlock (&display->priv->thread_lock);
return G_SOURCE_REMOVE;
}
static gpointer
_event_thread_main (GstGLDisplay * display)
{
g_mutex_lock (&display->priv->thread_lock);
display->main_context = g_main_context_new ();
display->main_loop = g_main_loop_new (display->main_context, FALSE);
g_main_context_invoke (display->main_context,
(GSourceFunc) _unlock_main_thread, display);
g_cond_broadcast (&display->priv->thread_cond);
g_main_loop_run (display->main_loop);
g_mutex_lock (&display->priv->thread_lock);
g_main_loop_unref (display->main_loop);
g_main_context_unref (display->main_context);
display->main_loop = NULL;
display->main_context = NULL;
g_cond_broadcast (&display->priv->thread_cond);
g_mutex_unlock (&display->priv->thread_lock);
return NULL;
}
static void
gst_gl_display_class_init (GstGLDisplayClass * klass)
{
/**
* GstGLDisplay::create-context:
* @object: the #GstGLDisplay
* @context: (transfer none): other context to share resources with.
*
* Overrides the @GstGLContext creation mechanism.
* It can be called in any thread and it is emitted with
* display's object lock held.
*
* Returns: (transfer full): the new context.
*/
gst_gl_display_signals[CREATE_CONTEXT] =
g_signal_new ("create-context", G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, GST_TYPE_GL_CONTEXT, 1,
GST_TYPE_GL_CONTEXT);
klass->get_handle = gst_gl_display_default_get_handle;
klass->get_foreign_display = gst_gl_display_default_get_foreign_display;
klass->create_window = gst_gl_display_default_create_window;
G_OBJECT_CLASS (klass)->finalize = gst_gl_display_finalize;
G_OBJECT_CLASS (klass)->dispose = gst_gl_display_dispose;
}
static void
gst_gl_display_init (GstGLDisplay * display)
{
display->priv = gst_gl_display_get_instance_private (display);
display->type = GST_GL_DISPLAY_TYPE_ANY;
display->priv->gl_api = GST_GL_API_ANY;
g_mutex_init (&display->priv->thread_lock);
g_cond_init (&display->priv->thread_cond);
g_mutex_init (&display->priv->window_lock);
display->priv->event_thread = g_thread_new ("gldisplay-event",
(GThreadFunc) _event_thread_main, display);
g_mutex_lock (&display->priv->thread_lock);
while (!display->main_loop)
g_cond_wait (&display->priv->thread_cond, &display->priv->thread_lock);
g_mutex_unlock (&display->priv->thread_lock);
GST_TRACE ("init %p", display);
gst_gl_buffer_init_once ();
gst_gl_memory_pbo_init_once ();
gst_gl_renderbuffer_init_once ();
#if GST_GL_HAVE_PLATFORM_EGL
gst_gl_memory_egl_init_once ();
#endif
}
static void
gst_gl_display_dispose (GObject * object)
{
GstGLDisplay *display = GST_GL_DISPLAY (object);
if (display->main_loop)
g_main_loop_quit (display->main_loop);
if (display->priv->event_thread) {
/* can't use g_thread_join() as we could lose the last ref from a user
* function */
g_mutex_lock (&display->priv->thread_lock);
while (display->main_loop)
g_cond_wait (&display->priv->thread_cond, &display->priv->thread_lock);
g_mutex_unlock (&display->priv->thread_lock);
g_thread_unref (display->priv->event_thread);
}
display->priv->event_thread = NULL;
if (display->event_source) {
g_source_destroy (display->event_source);
g_source_unref (display->event_source);
}
display->event_source = NULL;
G_OBJECT_CLASS (gst_gl_display_parent_class)->dispose (object);
}
static void
gst_gl_display_finalize (GObject * object)
{
GstGLDisplay *display = GST_GL_DISPLAY (object);
GList *l;
GST_TRACE_OBJECT (object, "finalizing");
for (l = display->priv->contexts; l; l = l->next) {
g_weak_ref_clear ((GWeakRef *) l->data);
g_free (l->data);
}
g_list_free (display->windows);
g_list_free (display->priv->contexts);
g_cond_clear (&display->priv->thread_cond);
g_mutex_clear (&display->priv->thread_lock);
g_mutex_clear (&display->priv->window_lock);
G_OBJECT_CLASS (gst_gl_display_parent_class)->finalize (object);
}
/**
* gst_gl_display_new:
*
* Returns: (transfer full): a new #GstGLDisplay
*
* Since: 1.4
*/
GstGLDisplay *
gst_gl_display_new (void)
{
GstGLDisplay *display = NULL;
const gchar *user_choice, *platform_choice;
static volatile gsize _init = 0;
if (g_once_init_enter (&_init)) {
GST_DEBUG_CATEGORY_INIT (gst_gl_display_debug, "gldisplay", 0,
"gldisplay element");
g_once_init_leave (&_init, 1);
}
user_choice = g_getenv ("GST_GL_WINDOW");
platform_choice = g_getenv ("GST_GL_PLATFORM");
GST_INFO ("creating a display, user choice:%s (platform: %s)",
GST_STR_NULL (user_choice), GST_STR_NULL (platform_choice));
#if GST_GL_HAVE_WINDOW_COCOA
if (!display && (!user_choice || g_strstr_len (user_choice, 5, "cocoa"))) {
display = GST_GL_DISPLAY (gst_gl_display_cocoa_new ());
if (!display)
return NULL;
}
#endif
#if GST_GL_HAVE_WINDOW_WAYLAND
if (!display && (!user_choice || g_strstr_len (user_choice, 7, "wayland")))
display = GST_GL_DISPLAY (gst_gl_display_wayland_new (NULL));
#endif
#if GST_GL_HAVE_WINDOW_X11
if (!display && (!user_choice || g_strstr_len (user_choice, 3, "x11")))
display = GST_GL_DISPLAY (gst_gl_display_x11_new (NULL));
#endif
#if GST_GL_HAVE_WINDOW_VIV_FB
if (!display && (!user_choice || g_strstr_len (user_choice, 6, "viv-fb"))) {
const gchar *disp_idx_str = NULL;
gint disp_idx = 0;
disp_idx_str = g_getenv ("GST_GL_VIV_FB");
if (disp_idx_str) {
gint64 v = g_ascii_strtoll (disp_idx_str, NULL, 10);
if (v >= G_MININT && v <= G_MAXINT)
disp_idx = v;
}
display = GST_GL_DISPLAY (gst_gl_display_viv_fb_new (disp_idx));
}
#endif
#if GST_GL_HAVE_WINDOW_GBM
if (!display && (!user_choice || g_strstr_len (user_choice, 3, "gbm"))) {
display = GST_GL_DISPLAY (gst_gl_display_gbm_new ());
}
#endif
#if GST_GL_HAVE_PLATFORM_EGL
if (!display && (user_choice && g_strstr_len (user_choice, 10, "egl-device"))) {
display = GST_GL_DISPLAY (gst_gl_display_egl_device_new (0));
}
if (!display && (!platform_choice
|| g_strstr_len (platform_choice, 3, "egl"))) {
display = GST_GL_DISPLAY (gst_gl_display_egl_new ());
}
#endif
if (!display) {
GST_INFO ("Could not create platform/winsys display. user specified %s "
"(platform: %s), creating dummy",
GST_STR_NULL (user_choice), GST_STR_NULL (platform_choice));
display = g_object_new (GST_TYPE_GL_DISPLAY, NULL);
gst_object_ref_sink (display);
}
return display;
}
/**
* gst_gl_display_get_handle:
* @display: a #GstGLDisplay
*
* Returns: the native handle for the display
*
* Since: 1.4
*/
guintptr
gst_gl_display_get_handle (GstGLDisplay * display)
{
GstGLDisplayClass *klass;
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), 0);
klass = GST_GL_DISPLAY_GET_CLASS (display);
g_return_val_if_fail (klass->get_handle != NULL, 0);
return klass->get_handle (display);
}
static guintptr
gst_gl_display_default_get_handle (GstGLDisplay * display)
{
return 0;
}
/**
* gst_gl_display_get_foreign_display:
* @display: a #GstGLDisplay
*
* Returns: whether the context belongs to a foreign display
*
* Since: 1.18
*/
gboolean
gst_gl_display_get_foreign_display (GstGLDisplay * display)
{
GstGLDisplayClass *klass;
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), FALSE);
klass = GST_GL_DISPLAY_GET_CLASS (display);
g_return_val_if_fail (klass->get_foreign_display != NULL, 0);
return klass->get_foreign_display (display);
}
static gboolean
gst_gl_display_default_get_foreign_display (GstGLDisplay * display)
{
return FALSE;
}
/**
* gst_gl_display_filter_gl_api:
* @display: a #GstGLDisplay
* @gl_api: a #GstGLAPI to filter with
*
* limit the use of OpenGL to the requested @gl_api. This is intended to allow
* application and elements to request a specific set of OpenGL API's based on
* what they support. See gst_gl_context_get_gl_api() for the retrieving the
* API supported by a #GstGLContext.
*/
void
gst_gl_display_filter_gl_api (GstGLDisplay * display, GstGLAPI gl_api)
{
gchar *gl_api_s;
g_return_if_fail (GST_IS_GL_DISPLAY (display));
gl_api_s = gst_gl_api_to_string (gl_api);
GST_TRACE_OBJECT (display, "filtering with api %s", gl_api_s);
g_free (gl_api_s);
GST_OBJECT_LOCK (display);
display->priv->gl_api &= gl_api;
GST_OBJECT_UNLOCK (display);
}
GstGLAPI
gst_gl_display_get_gl_api_unlocked (GstGLDisplay * display)
{
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), GST_GL_API_NONE);
return display->priv->gl_api;
}
/**
* gst_gl_display_get_gl_api:
* @display: a #GstGLDisplay
*
* see gst_gl_display_filter_gl_api() for what the returned value represents
*
* Returns: the #GstGLAPI configured for @display
*/
GstGLAPI
gst_gl_display_get_gl_api (GstGLDisplay * display)
{
GstGLAPI ret;
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), GST_GL_API_NONE);
GST_OBJECT_LOCK (display);
ret = display->priv->gl_api;
GST_OBJECT_UNLOCK (display);
return ret;
}
/**
* gst_gl_display_get_handle_type:
* @display: a #GstGLDisplay
*
* Returns: the #GstGLDisplayType of @display
*
* Since: 1.4
*/
GstGLDisplayType
gst_gl_display_get_handle_type (GstGLDisplay * display)
{
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), GST_GL_DISPLAY_TYPE_NONE);
return display->type;
}
/**
* gst_context_set_gl_display:
* @context: a #GstContext
* @display: (transfer none): resulting #GstGLDisplay
*
* Sets @display on @context
*
* Since: 1.4
*/
void
gst_context_set_gl_display (GstContext * context, GstGLDisplay * display)
{
GstStructure *s;
g_return_if_fail (context != NULL);
if (display)
GST_CAT_LOG (gst_context,
"setting GstGLDisplay(%" GST_PTR_FORMAT ") on context(%" GST_PTR_FORMAT
")", display, context);
s = gst_context_writable_structure (context);
gst_structure_set (s, GST_GL_DISPLAY_CONTEXT_TYPE, GST_TYPE_GL_DISPLAY,
display, NULL);
}
/**
* gst_context_get_gl_display:
* @context: a #GstContext
* @display: (out) (transfer full): resulting #GstGLDisplay
*
* Returns: Whether @display was in @context
*
* Since: 1.4
*/
gboolean
gst_context_get_gl_display (GstContext * context, GstGLDisplay ** display)
{
const GstStructure *s;
gboolean ret;
g_return_val_if_fail (display != NULL, FALSE);
g_return_val_if_fail (context != NULL, FALSE);
s = gst_context_get_structure (context);
ret = gst_structure_get (s, GST_GL_DISPLAY_CONTEXT_TYPE,
GST_TYPE_GL_DISPLAY, display, NULL);
GST_CAT_LOG (gst_context, "got GstGLDisplay(%p) from context(%p)", *display,
context);
return ret;
}
/**
* gst_gl_display_create_context:
* @display: a #GstGLDisplay
* @other_context: (transfer none): other #GstGLContext to share resources with.
* @p_context: (transfer full) (out): resulting #GstGLContext
* @error: (allow-none): resulting #GError
*
* It requires the display's object lock to be held.
*
* Returns: whether a new context could be created.
*
* Since: 1.6
*/
gboolean
gst_gl_display_create_context (GstGLDisplay * display,
GstGLContext * other_context, GstGLContext ** p_context, GError ** error)
{
GstGLContext *context = NULL;
gboolean ret = FALSE;
g_return_val_if_fail (display != NULL, FALSE);
g_return_val_if_fail (p_context != NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
g_signal_emit (display, gst_gl_display_signals[CREATE_CONTEXT], 0,
other_context, &context);
if (context) {
*p_context = context;
return TRUE;
}
context = gst_gl_context_new (display);
if (!context) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_FAILED,
"Failed to create GL context");
return FALSE;
}
GST_DEBUG_OBJECT (display,
"creating context %" GST_PTR_FORMAT " from other context %"
GST_PTR_FORMAT, context, other_context);
ret = gst_gl_context_create (context, other_context, error);
if (ret)
*p_context = context;
else
gst_object_unref (context);
return ret;
}
/**
* gst_gl_display_create_window:
* @display: a #GstGLDisplay
*
* Returns: (transfer full): a new #GstGLWindow for @display or %NULL.
*/
/* XXX: previous versions had documentation requiring the OBJECT lock to be
* held when this fuction is called so that needs to always work. */
GstGLWindow *
gst_gl_display_create_window (GstGLDisplay * display)
{
GstGLDisplayClass *klass;
GstGLWindow *window;
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), NULL);
klass = GST_GL_DISPLAY_GET_CLASS (display);
g_return_val_if_fail (klass->create_window != NULL, NULL);
g_mutex_lock (&display->priv->window_lock);
window = klass->create_window (display);
if (window) {
display->windows = g_list_prepend (display->windows, window);
}
g_mutex_unlock (&display->priv->window_lock);
GST_DEBUG_OBJECT (display, "Adding window %" GST_PTR_FORMAT
" (%p) to internal list", window, window);
return window;
}
static GstGLWindow *
gst_gl_display_default_create_window (GstGLDisplay * display)
{
return gst_gl_window_new (display);
}
/**
* gst_gl_display_remove_window:
* @display: a #GstGLDisplay
* @window: a #GstGLWindow to remove
*
* Returns: if @window could be removed from @display
*
* Since: 1.12
*/
gboolean
gst_gl_display_remove_window (GstGLDisplay * display, GstGLWindow * window)
{
gboolean ret = FALSE;
GList *l;
g_mutex_lock (&display->priv->window_lock);
l = g_list_find (display->windows, window);
if (l) {
display->windows = g_list_delete_link (display->windows, l);
ret = TRUE;
}
GST_DEBUG_OBJECT (display, "Removing window %" GST_PTR_FORMAT
" (%p) from internal list", window, window);
g_mutex_unlock (&display->priv->window_lock);
return ret;
}
/**
* gst_gl_display_find_window:
* @display: a #GstGLDisplay
* @data: (closure): some data to pass to @compare_func
* @compare_func: (scope call): a comparison function to run
*
* Deprecated for gst_gl_display_retrieve_window().
*
* Execute @compare_func over the list of windows stored by @display. The
* first argument to @compare_func is the #GstGLWindow being checked and the
* second argument is @data.
*
* Returns: (transfer none): The first #GstGLWindow that causes a match
* from @compare_func
*
* Since: 1.12
*/
GstGLWindow *
gst_gl_display_find_window (GstGLDisplay * display, gpointer data,
GCompareFunc compare_func)
{
GstGLWindow *ret;
ret = gst_gl_display_retrieve_window (display, data, compare_func);
if (ret)
gst_object_unref (ret);
return ret;
}
/**
* gst_gl_display_retrieve_window:
* @display: a #GstGLDisplay
* @data: (closure): some data to pass to @compare_func
* @compare_func: (scope call): a comparison function to run
*
* Execute @compare_func over the list of windows stored by @display. The
* first argument to @compare_func is the #GstGLWindow being checked and the
* second argument is @data.
*
* Returns: (transfer full): The first #GstGLWindow that causes a match
* from @compare_func
*
* Since: 1.18
*/
GstGLWindow *
gst_gl_display_retrieve_window (GstGLDisplay * display, gpointer data,
GCompareFunc compare_func)
{
GstGLWindow *ret = NULL;
GList *l;
g_mutex_lock (&display->priv->window_lock);
l = g_list_find_custom (display->windows, data, compare_func);
if (l)
ret = gst_object_ref (l->data);
GST_DEBUG_OBJECT (display, "Found window %" GST_PTR_FORMAT
" (%p) in internal list", ret, ret);
g_mutex_unlock (&display->priv->window_lock);
return ret;
}
static GstGLContext *
_get_gl_context_for_thread_unlocked (GstGLDisplay * display, GThread * thread)
{
GstGLContext *context = NULL;
GList *prev = NULL, *l = display->priv->contexts;
while (l) {
GWeakRef *ref = l->data;
GThread *context_thread;
context = g_weak_ref_get (ref);
if (!context) {
/* remove dead contexts */
g_weak_ref_clear (l->data);
g_free (l->data);
display->priv->contexts = g_list_delete_link (display->priv->contexts, l);
l = prev ? prev->next : display->priv->contexts;
continue;
}
if (thread == NULL) {
GST_DEBUG_OBJECT (display, "Returning GL context %" GST_PTR_FORMAT " for "
"NULL thread", context);
return context;
}
context_thread = gst_gl_context_get_thread (context);
if (thread != context_thread) {
g_thread_unref (context_thread);
gst_object_unref (context);
prev = l;
l = l->next;
continue;
}
if (context_thread)
g_thread_unref (context_thread);
GST_DEBUG_OBJECT (display, "Returning GL context %" GST_PTR_FORMAT " for "
"thread %p", context, thread);
return context;
}
GST_DEBUG_OBJECT (display, "No GL context for thread %p", thread);
return NULL;
}
/**
* gst_gl_display_get_gl_context_for_thread:
* @display: a #GstGLDisplay
* @thread: a #GThread
*
* Returns: (transfer full): the #GstGLContext current on @thread or %NULL
*
* Must be called with the object lock held.
*
* Since: 1.6
*/
GstGLContext *
gst_gl_display_get_gl_context_for_thread (GstGLDisplay * display,
GThread * thread)
{
GstGLContext *context;
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), NULL);
context = _get_gl_context_for_thread_unlocked (display, thread);
GST_DEBUG_OBJECT (display, "returning context %" GST_PTR_FORMAT " for thread "
"%p", context, thread);
return context;
}
static gboolean
_check_collision (GstGLContext * context, GstGLContext * collision)
{
GThread *thread, *collision_thread;
gboolean ret = FALSE;
if (!context || !collision)
return FALSE;
thread = gst_gl_context_get_thread (context);
collision_thread = gst_gl_context_get_thread (collision);
if (!thread || !collision_thread) {
ret = FALSE;
goto out;
}
if (thread == collision_thread) {
ret = TRUE;
goto out;
}
out:
if (thread)
g_thread_unref (thread);
if (collision_thread)
g_thread_unref (collision_thread);
return ret;
}
/**
* gst_gl_display_add_context:
* @display: a #GstGLDisplay
* @context: (transfer none): a #GstGLContext
*
* Returns: whether @context was successfully added. %FALSE may be returned
* if there already exists another context for @context's active thread.
*
* Must be called with the object lock held.
*
* Since: 1.6
*/
gboolean
gst_gl_display_add_context (GstGLDisplay * display, GstGLContext * context)
{
GstGLContext *collision = NULL;
GstGLDisplay *context_display;
gboolean ret = TRUE;
GThread *thread;
GWeakRef *ref;
g_return_val_if_fail (GST_IS_GL_DISPLAY (display), FALSE);
g_return_val_if_fail (GST_IS_GL_CONTEXT (context), FALSE);
context_display = gst_gl_context_get_display (context);
g_assert (context_display == display);
gst_object_unref (context_display);
thread = gst_gl_context_get_thread (context);
if (thread) {
collision = _get_gl_context_for_thread_unlocked (display, thread);
g_thread_unref (thread);
/* adding the same context is a no-op */
if (context == collision) {
GST_LOG_OBJECT (display, "Attempting to add the same GL context %"
GST_PTR_FORMAT ". Ignoring", context);
ret = TRUE;
goto out;
}
if (_check_collision (context, collision)) {
GST_DEBUG_OBJECT (display, "Collision detected adding GL context "
"%" GST_PTR_FORMAT, context);
ret = FALSE;
goto out;
}
}
ref = g_new0 (GWeakRef, 1);
g_weak_ref_init (ref, context);
GST_DEBUG_OBJECT (display, "Adding GL context %" GST_PTR_FORMAT, context);
display->priv->contexts = g_list_prepend (display->priv->contexts, ref);
out:
if (collision)
gst_object_unref (collision);
GST_DEBUG_OBJECT (display, "%ssuccessfully inserted context %" GST_PTR_FORMAT,
ret ? "" : "un", context);
return ret;
}
/**
* gst_gl_display_remove_context:
* @display: a #GstGLDisplay
* @context: (transfer none): the #GstGLContext to remove
*
* Must be called with the object lock held.
*
* Since: 1.18
*/
void
gst_gl_display_remove_context (GstGLDisplay * display, GstGLContext * needle)
{
GstGLContext *context;
GList *prev = NULL, *l;
g_return_if_fail (GST_IS_GL_DISPLAY (display));
g_return_if_fail (GST_IS_GL_CONTEXT (needle));
l = display->priv->contexts;
while (l) {
GWeakRef *ref = l->data;
context = g_weak_ref_get (ref);
if (!context || context == needle) {
/* remove dead contexts */
g_weak_ref_clear (l->data);
g_free (l->data);
display->priv->contexts = g_list_delete_link (display->priv->contexts, l);
l = prev ? prev->next : display->priv->contexts;
if (context) {
GST_INFO_OBJECT (display, "removed context %" GST_PTR_FORMAT
" from internal list", context);
return;
} else
continue;
}
}
GST_WARNING_OBJECT (display, "%" GST_PTR_FORMAT " was not found in this "
"display", needle);
}