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

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/*
* 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
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* 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 propogate
* 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'.
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* - GST_GL_API influences the OpenGL API requested by the OpenGL platform.
* Common values are 'opengl' and 'gles2'.
*
* <note>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().</note>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gl.h"
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#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
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#if GST_GL_HAVE_PLATFORM_EGL
#include <gst/gl/egl/gstgldisplay_egl.h>
#include <gst/gl/egl/gsteglimagememory.h>
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#endif
GST_DEBUG_CATEGORY_STATIC (gst_context);
GST_DEBUG_CATEGORY_STATIC (gst_gl_display_debug);
#define GST_CAT_DEFAULT gst_gl_display_debug
#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,
DEBUG_INIT);
#define GST_GL_DISPLAY_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE((o), GST_TYPE_GL_DISPLAY, GstGLDisplayPrivate))
static void gst_gl_display_finalize (GObject * object);
static guintptr gst_gl_display_default_get_handle (GstGLDisplay * display);
struct _GstGLDisplayPrivate
{
GstGLAPI gl_api;
GList *contexts;
};
static void
gst_gl_display_class_init (GstGLDisplayClass * klass)
{
g_type_class_add_private (klass, sizeof (GstGLDisplayPrivate));
klass->get_handle = gst_gl_display_default_get_handle;
G_OBJECT_CLASS (klass)->finalize = gst_gl_display_finalize;
}
static void
gst_gl_display_init (GstGLDisplay * display)
{
display->priv = GST_GL_DISPLAY_GET_PRIVATE (display);
display->type = GST_GL_DISPLAY_TYPE_ANY;
display->priv->gl_api = GST_GL_API_ANY;
GST_TRACE ("init %p", display);
gst_gl_memory_init ();
#if GST_GL_HAVE_PLATFORM_EGL
gst_egl_image_memory_init ();
#endif
}
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->priv->contexts);
G_OBJECT_CLASS (gst_gl_display_parent_class)->finalize (object);
}
/**
* gst_gl_display_new:
*
* Returns: (transfer full): a new #GstGLDisplay
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*
* 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_X11
if (!display && (!user_choice || g_strstr_len (user_choice, 3, "x11")))
display = GST_GL_DISPLAY (gst_gl_display_x11_new (NULL));
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#endif
#if GST_GL_HAVE_WINDOW_WAYLAND
if (!display && (!user_choice || g_strstr_len (user_choice, 7, "wayland")))
display = g_object_new (GST_TYPE_GL_DISPLAY, NULL);
#endif
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#if GST_GL_HAVE_PLATFORM_EGL
if (!display && (!platform_choice
|| g_strstr_len (platform_choice, 3, "egl")))
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display = GST_GL_DISPLAY (gst_gl_display_egl_new ());
#endif
if (!display) {
/* subclass returned a NULL window */
GST_WARNING ("Could not create display. user specified %s "
"(platform: %s), creating dummy",
GST_STR_NULL (user_choice), GST_STR_NULL (platform_choice));
return g_object_new (GST_TYPE_GL_DISPLAY, NULL);
}
return display;
}
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_filter_gl_api:
* @display: a #GstGLDisplay
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* @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 retreiving 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);
}
/**
* 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
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*
* 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: resulting #GstGLDisplay
*
* Sets @display on @context
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*
* 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: resulting #GstGLDisplay
*
* Returns: Whether @display was in @context
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*
* 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;
}
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);
display->priv->contexts = g_list_delete_link (display->priv->contexts, l);
l = prev ? prev->next : display->priv->contexts;
continue;
}
context_thread = gst_gl_context_get_thread (context);
if (thread != NULL && 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);
return context;
}
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
*
* 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);
GST_OBJECT_LOCK (display);
context = _get_gl_context_for_thread_unlocked (display, thread);
GST_DEBUG_OBJECT (display, "returning context %" GST_PTR_FORMAT " for thread "
"%p", context, thread);
GST_OBJECT_UNLOCK (display);
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 (collision == context) {
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.
*
* 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_GL_IS_CONTEXT (context), FALSE);
context_display = gst_gl_context_get_display (context);
g_assert (context_display == display);
gst_object_unref (context_display);
GST_OBJECT_LOCK (display);
thread = gst_gl_context_get_thread (context);
if (thread) {
collision = _get_gl_context_for_thread_unlocked (display, thread);
g_thread_unref (thread);
if (_check_collision (context, collision)) {
ret = FALSE;
goto out;
}
}
ref = g_new0 (GWeakRef, 1);
g_weak_ref_init (ref, 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);
GST_OBJECT_UNLOCK (display);
return ret;
}