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gstreamer/gst-libs/gst/gl/gstglcontext.c
Matthew Waters 817417c005 glcontext: detect the sharegroup case where the context are in different chains 
In the end they will lead to the same root context in the tree so check that
for equality.
2017-12-09 19:31:47 +00:00

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/*
* GStreamer
* 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:gstglcontext
* @short_description: OpenGL context abstraction
* @title: GstGLContext
* @see_also: #GstGLDisplay, #GstGLWindow
*
* #GstGLContext wraps an OpenGL context object in a uniform API. As a result
* of the limitation on OpenGL context, this object is not thread safe unless
* specified and must only be activated in a single thread.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#if defined(ANDROID) || defined(__ANDROID__)
/* Avoid a linker error with _isoc99_sscanf() when building a shared library
* for android
*/
#define _GNU_SOURCE
#endif
#ifndef GL_NUM_EXTENSIONS
#define GL_NUM_EXTENSIONS 0x0000821d
#endif
#include <gmodule.h>
#include "gl.h"
#include "gstglcontext.h"
#if GST_GL_HAVE_PLATFORM_GLX
#include "x11/gstglcontext_glx.h"
#endif
#if GST_GL_HAVE_PLATFORM_EGL
#include "egl/gstglcontext_egl.h"
#endif
#if GST_GL_HAVE_PLATFORM_CGL
#include "cocoa/gstglcontext_cocoa.h"
#endif
#if GST_GL_HAVE_PLATFORM_WGL
#include "win32/gstglcontext_wgl.h"
#endif
#if GST_GL_HAVE_PLATFORM_EAGL
#include "eagl/gstglcontext_eagl.h"
#endif
GST_DEBUG_CATEGORY_STATIC (gst_performance);
static GModule *module_self;
#if GST_GL_HAVE_OPENGL
static GOnce module_opengl_gonce = G_ONCE_INIT;
static GModule *module_opengl;
static gpointer
load_opengl_module (gpointer user_data)
{
#ifdef GST_GL_LIBGL_MODULE_NAME
module_opengl = g_module_open (GST_GL_LIBGL_MODULE_NAME, G_MODULE_BIND_LAZY);
#else
/* On Linux the .so is only in -dev packages, try with a real soname
* Proper compilers will optimize away the strcmp */
if (strcmp (G_MODULE_SUFFIX, "so") == 0)
module_opengl = g_module_open ("libGL.so.1", G_MODULE_BIND_LAZY);
/* This automatically handles the suffix and even .la files */
if (!module_opengl)
module_opengl = g_module_open ("libGL", G_MODULE_BIND_LAZY);
#endif
return NULL;
}
#endif
#if GST_GL_HAVE_GLES2
static GOnce module_gles2_gonce = G_ONCE_INIT;
static GModule *module_gles2;
static gpointer
load_gles2_module (gpointer user_data)
{
#ifdef GST_GL_LIBGLESV2_MODULE_NAME
module_gles2 =
g_module_open (GST_GL_LIBGLESV2_MODULE_NAME, G_MODULE_BIND_LAZY);
#else
/* On Linux the .so is only in -dev packages, try with a real soname
* Proper compilers will optimize away the strcmp */
if (strcmp (G_MODULE_SUFFIX, "so") == 0)
module_gles2 = g_module_open ("libGLESv2.so.2", G_MODULE_BIND_LAZY);
/* This automatically handles the suffix and even .la files */
if (!module_gles2)
module_gles2 = g_module_open ("libGLESv2", G_MODULE_BIND_LAZY);
#endif
return NULL;
}
#endif
#if GST_GL_HAVE_GLES3
#error "Add module loading support for GLES3"
#endif
#define GST_CAT_DEFAULT gst_gl_context_debug
GST_DEBUG_CATEGORY (GST_CAT_DEFAULT);
#define gst_gl_context_parent_class parent_class
G_DEFINE_ABSTRACT_TYPE (GstGLContext, gst_gl_context, GST_TYPE_OBJECT);
#define GST_GL_CONTEXT_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE((o), GST_GL_TYPE_CONTEXT, GstGLContextPrivate))
static gpointer gst_gl_context_create_thread (GstGLContext * context);
static void gst_gl_context_finalize (GObject * object);
struct _GstGLContextPrivate
{
GstGLDisplay *display;
GThread *gl_thread;
GThread *active_thread;
/* conditions */
GMutex render_lock;
GCond create_cond;
GCond destroy_cond;
gboolean created;
gboolean alive;
GWeakRef other_context_ref;
GError **error;
gint gl_major;
gint gl_minor;
gchar *gl_exts;
};
typedef struct
{
GstGLContext parent;
guintptr handle;
GstGLPlatform platform;
GstGLAPI available_apis;
} GstGLWrappedContext;
typedef struct
{
GstGLContextClass parent;
} GstGLWrappedContextClass;
#define GST_GL_TYPE_WRAPPED_CONTEXT (gst_gl_wrapped_context_get_type())
GType gst_gl_wrapped_context_get_type (void);
G_DEFINE_TYPE (GstGLWrappedContext, gst_gl_wrapped_context,
GST_GL_TYPE_CONTEXT);
#define GST_GL_WRAPPED_CONTEXT(o) (G_TYPE_CHECK_INSTANCE_CAST((o), GST_GL_TYPE_WRAPPED_CONTEXT, GstGLWrappedContext))
#define GST_GL_WRAPPED_CONTEXT_CLASS(k) (G_TYPE_CHECK_CLASS((k), GST_GL_TYPE_CONTEXT, GstGLContextClass))
#define GST_GL_IS_WRAPPED_CONTEXT(o) (G_TYPE_CHECK_INSTANCE_TYPE((o), GST_GL_TYPE_WRAPPED_CONTEXT))
#define GST_GL_IS_WRAPPED_CONTEXT_CLASS(k) (G_TYPE_CHECK_CLASS_TYPE((k), GST_GL_TYPE_WRAPPED_CONTEXT))
#define GST_GL_WRAPPED_CONTEXT_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS((o), GST_GL_TYPE_WRAPPED_CONTEXT, GstGLWrappedContextClass))
GQuark
gst_gl_context_error_quark (void)
{
return g_quark_from_static_string ("gst-gl-context-error-quark");
}
static void
_ensure_window (GstGLContext * context)
{
GstGLWindow *window;
if (context->window)
return;
window = gst_gl_window_new (context->priv->display);
gst_gl_context_set_window (context, window);
gst_object_unref (window);
}
static void
gst_gl_context_init (GstGLContext * context)
{
context->priv = GST_GL_CONTEXT_GET_PRIVATE (context);
context->window = NULL;
context->gl_vtable = g_slice_alloc0 (sizeof (GstGLFuncs));
g_mutex_init (&context->priv->render_lock);
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
gst_gl_context_class_init (GstGLContextClass * klass)
{
g_type_class_add_private (klass, sizeof (GstGLContextPrivate));
module_self = g_module_open (NULL, G_MODULE_BIND_LAZY);
klass->get_proc_address =
GST_DEBUG_FUNCPTR (gst_gl_context_default_get_proc_address);
G_OBJECT_CLASS (klass)->finalize = gst_gl_context_finalize;
}
static void
_init_debug (void)
{
static volatile gsize _init = 0;
if (g_once_init_enter (&_init)) {
GST_DEBUG_CATEGORY_INIT (gst_gl_context_debug, "glcontext", 0,
"glcontext element");
GST_DEBUG_CATEGORY_GET (gst_performance, "GST_PERFORMANCE");
g_once_init_leave (&_init, 1);
}
}
/**
* gst_gl_context_new:
* @display: a #GstGLDisplay
*
* Create a new #GstGLContext with the specified @display
*
* Returns: a new #GstGLContext
*/
GstGLContext *
gst_gl_context_new (GstGLDisplay * display)
{
GstGLContext *context = NULL;
const gchar *user_choice;
_init_debug ();
user_choice = g_getenv ("GST_GL_PLATFORM");
GST_INFO ("creating a context, user choice:%s", user_choice);
#if GST_GL_HAVE_PLATFORM_GLX
if (!context && (!user_choice || g_strstr_len (user_choice, 3, "glx")))
context = GST_GL_CONTEXT (gst_gl_context_glx_new ());
#endif
#if GST_GL_HAVE_PLATFORM_EGL
if (!context && (!user_choice || g_strstr_len (user_choice, 7, "egl")))
context = GST_GL_CONTEXT (gst_gl_context_egl_new ());
#endif
#if GST_GL_HAVE_PLATFORM_CGL
if (!context && (!user_choice || g_strstr_len (user_choice, 5, "cgl")))
context = GST_GL_CONTEXT (gst_gl_context_cocoa_new ());
#endif
#if GST_GL_HAVE_PLATFORM_WGL
if (!context && (!user_choice || g_strstr_len (user_choice, 3, "wgl"))) {
context = GST_GL_CONTEXT (gst_gl_context_wgl_new ());
}
#endif
#if GST_GL_HAVE_PLATFORM_EAGL
if (!context && (!user_choice || g_strstr_len (user_choice, 5, "eagl")))
context = GST_GL_CONTEXT (gst_gl_context_eagl_new ());
#endif
if (!context) {
/* subclass returned a NULL context */
GST_WARNING ("Could not create context. user specified %s",
user_choice ? user_choice : "(null)");
return NULL;
}
context->priv->display = gst_object_ref (display);
return context;
}
/**
* gst_gl_context_new_wrapped:
* @display: a #GstGLDisplay
* @handle: the OpenGL context to wrap
* @context_type: a #GstGLPlatform specifying the type of context in @handle
* @available_apis: a #GstGLAPI containing the available OpenGL apis in @handle
*
* Wraps an existing OpenGL context into a #GstGLContext.
*
* Returns: a #GstGLContext wrapping @handle
*/
GstGLContext *
gst_gl_context_new_wrapped (GstGLDisplay * display, guintptr handle,
GstGLPlatform context_type, GstGLAPI available_apis)
{
GstGLContext *context;
GstGLWrappedContext *context_wrap = NULL;
_init_debug ();
context_wrap = g_object_new (GST_GL_TYPE_WRAPPED_CONTEXT, NULL);
if (!context_wrap) {
/* subclass returned a NULL context */
GST_ERROR ("Could not wrap existing context");
return NULL;
}
context = (GstGLContext *) context_wrap;
context->priv->display = gst_object_ref (display);
context_wrap->handle = handle;
context_wrap->platform = context_type;
context_wrap->available_apis = available_apis;
return context;
}
static void
gst_gl_context_finalize (GObject * object)
{
GstGLContext *context = GST_GL_CONTEXT (object);
if (context->window) {
gst_gl_window_set_resize_callback (context->window, NULL, NULL, NULL);
gst_gl_window_set_draw_callback (context->window, NULL, NULL, NULL);
if (context->priv->alive) {
g_mutex_lock (&context->priv->render_lock);
GST_INFO ("send quit gl window loop");
gst_gl_window_quit (context->window);
while (context->priv->alive) {
g_cond_wait (&context->priv->destroy_cond, &context->priv->render_lock);
}
g_mutex_unlock (&context->priv->render_lock);
}
gst_gl_window_set_close_callback (context->window, NULL, NULL, NULL);
if (context->priv->gl_thread) {
gpointer ret = g_thread_join (context->priv->gl_thread);
GST_INFO ("gl thread joined");
if (ret != NULL)
GST_ERROR ("gl thread returned a non-null pointer");
context->priv->gl_thread = NULL;
}
gst_object_unref (context->window);
}
gst_object_unref (context->priv->display);
if (context->gl_vtable) {
g_slice_free (GstGLFuncs, context->gl_vtable);
context->gl_vtable = NULL;
}
g_mutex_clear (&context->priv->render_lock);
g_cond_clear (&context->priv->destroy_cond);
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);
}
/**
* gst_gl_context_activate:
* @context: a #GstGLContext
* @activate: %TRUE to activate, %FALSE to deactivate
*
* (De)activate the OpenGL context represented by this @context.
*
* In OpenGL terms, calls eglMakeCurrent or similar with this context and the
* currently set window. See gst_gl_context_set_window() for details.
*
* Returns: Whether the activation succeeded
*/
gboolean
gst_gl_context_activate (GstGLContext * context, gboolean activate)
{
GstGLContextClass *context_class;
gboolean result;
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), FALSE);
context_class = GST_GL_CONTEXT_GET_CLASS (context);
g_return_val_if_fail (context_class->activate != NULL, FALSE);
GST_OBJECT_LOCK (context);
result = context_class->activate (context, activate);
context->priv->active_thread = result
&& activate ? context->priv->gl_thread : NULL;
GST_OBJECT_UNLOCK (context);
return result;
}
/**
* gst_gl_context_get_thread:
* @context: a #GstGLContext
*
* Returns: (transfer full): The #GThread, @context is current in or NULL
*
* Since: 1.6
*/
GThread *
gst_gl_context_get_thread (GstGLContext * context)
{
GThread *ret;
GST_OBJECT_LOCK (context);
ret = context->priv->active_thread;
if (ret)
g_thread_ref (ret);
GST_OBJECT_UNLOCK (context);
return ret;
}
/**
* gst_gl_context_get_gl_api:
* @context: a #GstGLContext
*
* Get the currently enabled OpenGL api.
*
* The currently available API may be limited by the #GstGLDisplay in use and/or
* the #GstGLWindow chosen.
*
* Returns: the currently available OpenGL api
*/
GstGLAPI
gst_gl_context_get_gl_api (GstGLContext * context)
{
GstGLContextClass *context_class;
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), GST_GL_API_NONE);
context_class = GST_GL_CONTEXT_GET_CLASS (context);
g_return_val_if_fail (context_class->get_gl_api != NULL, GST_GL_API_NONE);
return context_class->get_gl_api (context);
}
/**
* gst_gl_context_get_proc_address:
* @context: a #GstGLContext
* @name: an opengl function name
*
* Get a function pointer to a specified opengl function, @name. If the the
* specific function does not exist, NULL is returned instead.
*
* Platform specfic functions (names starting 'egl', 'glX', 'wgl', etc) can also
* be retreived using this method.
*
* Returns: a function pointer or NULL
*/
gpointer
gst_gl_context_get_proc_address (GstGLContext * context, const gchar * name)
{
gpointer ret;
GstGLContextClass *context_class;
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), NULL);
g_return_val_if_fail (!GST_GL_IS_WRAPPED_CONTEXT (context), NULL);
context_class = GST_GL_CONTEXT_GET_CLASS (context);
g_return_val_if_fail (context_class->get_proc_address != NULL, NULL);
ret = context_class->get_proc_address (context, name);
return ret;
}
gpointer
gst_gl_context_default_get_proc_address (GstGLContext * context,
const gchar * name)
{
gpointer ret = NULL;
GstGLAPI gl_api = gst_gl_context_get_gl_api (context);
/* First try to load symbol from the selected GL API for this context */
#if GST_GL_HAVE_GLES2
if (!ret && (gl_api & GST_GL_API_GLES2)) {
g_once (&module_gles2_gonce, load_gles2_module, NULL);
if (module_gles2)
g_module_symbol (module_gles2, name, &ret);
}
#endif
#if GST_GL_HAVE_OPENGL
if (!ret && (gl_api & (GST_GL_API_OPENGL | GST_GL_API_OPENGL3))) {
g_once (&module_opengl_gonce, load_opengl_module, NULL);
if (module_opengl)
g_module_symbol (module_opengl, name, &ret);
}
#endif
/* Otherwise fall back to the current module */
if (!ret)
g_module_symbol (module_self, name, &ret);
return ret;
}
/**
* gst_gl_context_set_window:
* @context: a #GstGLContext
* @window: (transfer full): a #GstGLWindow
*
* Set's the current window on @context to @window. The window can only be
* changed before gst_gl_context_create() has been called and the @window is not
* already running.
*
* Returns: Whether the window was successfully updated
*/
gboolean
gst_gl_context_set_window (GstGLContext * context, GstGLWindow * window)
{
g_return_val_if_fail (!GST_GL_IS_WRAPPED_CONTEXT (context), FALSE);
/* we can't change the window while we are running */
if (context->priv->alive)
return FALSE;
if (window) {
if (gst_gl_window_is_running (window))
return FALSE;
g_weak_ref_set (&window->context_ref, context);
}
if (context->window)
gst_object_unref (context->window);
context->window = window ? gst_object_ref (window) : NULL;
return TRUE;
}
/**
* gst_gl_context_get_window:
* @context: a #GstGLContext
*
* Returns: the currently set window
*/
GstGLWindow *
gst_gl_context_get_window (GstGLContext * context)
{
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), NULL);
if (GST_GL_IS_WRAPPED_CONTEXT (context))
return NULL;
_ensure_window (context);
return gst_object_ref (context->window);
}
static gboolean
_share_group_descendant (GstGLContext * context, GstGLContext * other_context,
GstGLContext ** root)
{
GstGLContext *next = gst_object_ref (context);
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;
}
prev = next;
next = g_weak_ref_get (&next->priv->other_context_ref);
gst_object_unref (prev);
}
if (root != NULL)
*root = 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)
{
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, &root1)
|| _share_group_descendant (other_context, context, &root2)
|| ((root1 != NULL || root2 != NULL) && root1 == root2);
}
/**
* gst_gl_context_create:
* @context: a #GstGLContext:
* @other_context: (allow-none): a #GstGLContext to share OpenGL objects with
* @error: (allow-none): a #GError
*
* Creates an OpenGL context in the current thread with the specified
* @other_context as a context to share shareable OpenGL objects with. See the
* OpenGL specification for what is shared between contexts.
*
* If an error occurs, and @error is not %NULL, then error will contain details
* of the error and %FALSE will be returned.
*
* Should only be called once.
*
* Returns: whether the context could successfully be created
*/
gboolean
gst_gl_context_create (GstGLContext * context,
GstGLContext * other_context, GError ** error)
{
gboolean alive = FALSE;
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), FALSE);
g_return_val_if_fail (!GST_GL_IS_WRAPPED_CONTEXT (context), FALSE);
_ensure_window (context);
g_mutex_lock (&context->priv->render_lock);
if (!context->priv->created) {
g_weak_ref_set (&context->priv->other_context_ref, other_context);
context->priv->error = error;
context->priv->gl_thread = g_thread_new ("gstglcontext",
(GThreadFunc) gst_gl_context_create_thread, context);
g_cond_wait (&context->priv->create_cond, &context->priv->render_lock);
context->priv->created = TRUE;
GST_INFO ("gl thread created");
}
alive = context->priv->alive;
g_mutex_unlock (&context->priv->render_lock);
return alive;
}
#ifndef GL_DEBUG_TYPE_ERROR
#define GL_DEBUG_TYPE_ERROR 0x824C
#endif
#ifndef GL_DEBUG_TYPE_DEPRECATED_BEHAVIOUR
#define GL_DEBUG_TYPE_DEPRECATED_BEHAVIOUR 0x824D
#endif
#ifndef GL_DEBUG_TYPE_UNDEFINED_BEHAVIOUR
#define GL_DEBUG_TYPE_UNDEFINED_BEHAVIOUR 0x824E
#endif
#ifndef GL_DEBUG_TYPE_PORTABILITY
#define GL_DEBUG_TYPE_PORTABILITY 0x824F
#endif
#ifndef GL_DEBUG_TYPE_PERFORMANCE
#define GL_DEBUG_TYPE_PERFORMANCE 0x8250
#endif
#ifndef GL_DEBUG_TYPE_MARKER
#define GL_DEBUG_TYPE_MARKER 0x8268
#endif
#ifndef GL_DEBUG_TYPE_OTHER
#define GL_DEBUG_TYPE_OTHER 0x8251
#endif
#ifndef GL_DEBUG_SEVERITY_HIGH
#define GL_DEBUG_SEVERITY_HIGH 0x9146
#endif
#ifndef GL_DEBUG_SEVERITY_MEDIUM
#define GL_DEBUG_SEVERITY_MEDIUM 0x9147
#endif
#ifndef GL_DEBUG_SEVERITY_LOW
#define GL_DEBUG_SEVERITY_LOW 0x9148
#endif
#ifndef GL_DEBUG_SEVERITY_NOTIFICATION
#define GL_DEBUG_SEVERITY_NOTIFICATION 0x826B
#endif
#ifndef GL_DEBUG_SOURCE_API
#define GL_DEBUG_SOURCE_API 0x8246
#endif
#ifndef GL_DEBUG_SOURCE_WINDOW_SYSTEM
#define GL_DEBUG_SOURCE_WINDOW_SYSTEM 0x8247
#endif
#ifndef GL_DEBUG_SOURCE_SHADER_COMPILER
#define GL_DEBUG_SOURCE_SHADER_COMPILER 0x8248
#endif
#ifndef GL_DEBUG_SOURCE_THIRD_PARTY
#define GL_DEBUG_SOURCE_THIRD_PARTY 0x8249
#endif
#ifndef GL_DEBUG_SOURCE_APPLICATION
#define GL_DEBUG_SOURCE_APPLICATION 0x824A
#endif
#ifndef GL_DEBUG_SOURCE_OTHER
#define GL_DEBUG_SOURCE_OTHER 0x824B
#endif
#if !defined(GST_DISABLE_GST_DEBUG)
static inline const gchar *
_debug_severity_to_string (GLenum severity)
{
switch (severity) {
case GL_DEBUG_SEVERITY_HIGH:
return "high";
case GL_DEBUG_SEVERITY_MEDIUM:
return "medium";
case GL_DEBUG_SEVERITY_LOW:
return "low";
case GL_DEBUG_SEVERITY_NOTIFICATION:
return "notification";
default:
return "invalid";
}
}
static inline const gchar *
_debug_source_to_string (GLenum source)
{
switch (source) {
case GL_DEBUG_SOURCE_API:
return "API";
case GL_DEBUG_SOURCE_WINDOW_SYSTEM:
return "winsys";
case GL_DEBUG_SOURCE_SHADER_COMPILER:
return "shader compiler";
case GL_DEBUG_SOURCE_THIRD_PARTY:
return "third party";
case GL_DEBUG_SOURCE_APPLICATION:
return "application";
case GL_DEBUG_SOURCE_OTHER:
return "other";
default:
return "invalid";
}
}
static inline const gchar *
_debug_type_to_string (GLenum type)
{
switch (type) {
case GL_DEBUG_TYPE_ERROR:
return "error";
case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOUR:
return "deprecated";
case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOUR:
return "undefined";
case GL_DEBUG_TYPE_PORTABILITY:
return "portability";
case GL_DEBUG_TYPE_PERFORMANCE:
return "performance";
case GL_DEBUG_TYPE_MARKER:
return "debug marker";
case GL_DEBUG_TYPE_OTHER:
return "other";
default:
return "invalid";
}
}
static void GSTGLAPI
_gst_gl_debug_callback (GLenum source, GLenum type, GLuint id, GLenum severity,
GLsizei length, const gchar * message, gpointer user_data)
{
GstGLContext *context = user_data;
const gchar *severity_str = _debug_severity_to_string (severity);
const gchar *source_str = _debug_source_to_string (source);
const gchar *type_str = _debug_type_to_string (type);
switch (type) {
case GL_DEBUG_TYPE_ERROR:
case GL_DEBUG_TYPE_UNDEFINED_BEHAVIOUR:
GST_ERROR_OBJECT (context, "%s: GL %s from %s id:%u, %s", severity_str,
type_str, source_str, id, message);
break;
case GL_DEBUG_TYPE_DEPRECATED_BEHAVIOUR:
case GL_DEBUG_TYPE_PORTABILITY:
GST_FIXME_OBJECT (context, "%s: GL %s from %s id:%u, %s", severity_str,
type_str, source_str, id, message);
break;
case GL_DEBUG_TYPE_PERFORMANCE:
GST_CAT_DEBUG_OBJECT (gst_performance, context, "%s: GL %s from %s id:%u,"
" %s", severity_str, type_str, source_str, id, message);
break;
default:
GST_DEBUG_OBJECT (context, "%s: GL %s from %s id:%u, %s", severity_str,
type_str, source_str, id, message);
break;
}
}
#endif
static gboolean
_create_context_info (GstGLContext * context, GstGLAPI gl_api, gint * gl_major,
gint * gl_minor, GError ** error)
{
const GstGLFuncs *gl;
guint maj = 0, min = 0;
GLenum gl_err = GL_NO_ERROR;
const gchar *opengl_version = NULL;
gl = context->gl_vtable;
GST_INFO ("GL_VERSION: %s",
GST_STR_NULL ((const gchar *) gl->GetString (GL_VERSION)));
GST_INFO ("GL_SHADING_LANGUAGE_VERSION: %s", GST_STR_NULL ((const gchar *)
gl->GetString (GL_SHADING_LANGUAGE_VERSION)));
GST_INFO ("GL_VENDOR: %s",
GST_STR_NULL ((const gchar *) gl->GetString (GL_VENDOR)));
GST_INFO ("GL_RENDERER: %s",
GST_STR_NULL ((const gchar *) gl->GetString (GL_RENDERER)));
gl_err = gl->GetError ();
if (gl_err != GL_NO_ERROR) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_FAILED,
"glGetString error: 0x%x", gl_err);
return FALSE;
}
opengl_version = (const gchar *) gl->GetString (GL_VERSION);
if (opengl_version && gl_api & GST_GL_API_GLES2)
/* gles starts with "OpenGL ES " */
opengl_version = &opengl_version[10];
if (opengl_version)
sscanf (opengl_version, "%d.%d", &maj, &min);
/* OpenGL > 1.2.0 */
if (gl_api & GST_GL_API_OPENGL || gl_api & GST_GL_API_OPENGL3) {
if ((maj < 1) || (maj < 2 && maj >= 1 && min < 2)) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_OLD_LIBS,
"OpenGL >= 1.2.0 required, found %u.%u", maj, min);
return FALSE;
}
}
if (gl_major)
*gl_major = maj;
if (gl_minor)
*gl_minor = min;
return TRUE;
}
static GstGLAPI
_compiled_api (void)
{
GstGLAPI ret = GST_GL_API_NONE;
#if GST_GL_HAVE_OPENGL
ret |= GST_GL_API_OPENGL | GST_GL_API_OPENGL3;
#endif
#if GST_GL_HAVE_GLES2
ret |= GST_GL_API_GLES2;
#endif
return ret;
}
static void
_unlock_create_thread (GstGLContext * context)
{
g_mutex_unlock (&context->priv->render_lock);
}
static GString *
_build_extension_string (GstGLContext * context)
{
const GstGLFuncs *gl = context->gl_vtable;
GString *ext_g_str = g_string_sized_new (1024);
const gchar *ext_const_c_str = NULL;
int i, n;
gl->GetIntegerv (GL_NUM_EXTENSIONS, &n);
for (i = 0; i < n; i++) {
ext_const_c_str = (const gchar *) gl->GetStringi (GL_EXTENSIONS, i);
if (ext_const_c_str)
g_string_append_printf (ext_g_str, "%s ", ext_const_c_str);
}
return ext_g_str;
}
//gboolean
//gst_gl_context_create (GstGLContext * context, GstGLContext * other_context, GError ** error)
static gpointer
gst_gl_context_create_thread (GstGLContext * context)
{
GstGLContextClass *context_class;
GstGLWindowClass *window_class;
GstGLFuncs *gl;
gboolean ret = FALSE;
GstGLAPI compiled_api, user_api, gl_api;
gchar *api_string;
gchar *compiled_api_s;
gchar *user_api_string;
const gchar *user_choice;
GError **error;
GstGLContext *other_context;
GString *ext_g_str = NULL;
const gchar *ext_const_c_str = NULL;
g_mutex_lock (&context->priv->render_lock);
error = context->priv->error;
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);
if (window_class->open) {
if (!window_class->open (context->window, error)) {
g_assert (error == NULL || *error != NULL);
goto failure;
}
}
gl = context->gl_vtable;
compiled_api = _compiled_api ();
user_choice = g_getenv ("GST_GL_API");
user_api = gst_gl_api_from_string (user_choice);
user_api_string = gst_gl_api_to_string (user_api);
compiled_api_s = gst_gl_api_to_string (compiled_api);
if ((user_api & compiled_api) == GST_GL_API_NONE) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_WRONG_API,
"Cannot create context with the user requested api (%s). "
"We have support for (%s)", user_api_string, compiled_api_s);
g_free (user_api_string);
g_free (compiled_api_s);
goto failure;
}
if (context_class->choose_format &&
!context_class->choose_format (context, error)) {
g_assert (error == NULL || *error != NULL);
g_free (compiled_api_s);
g_free (user_api_string);
goto failure;
}
GST_INFO ("Attempting to create opengl context. user chosen api(s) (%s), "
"compiled api support (%s)", user_api_string, compiled_api_s);
if (!context_class->create_context (context, compiled_api & user_api,
other_context, error)) {
g_assert (error == NULL || *error != NULL);
g_free (compiled_api_s);
g_free (user_api_string);
goto failure;
}
GST_INFO ("created context");
if (!context_class->activate (context, TRUE)) {
g_set_error (error, GST_GL_CONTEXT_ERROR,
GST_GL_CONTEXT_ERROR_RESOURCE_UNAVAILABLE,
"Failed to activate the GL Context");
g_free (compiled_api_s);
g_free (user_api_string);
goto failure;
}
gl_api = gst_gl_context_get_gl_api (context);
g_assert (gl_api != GST_GL_API_NONE && gl_api != GST_GL_API_ANY);
api_string = gst_gl_api_to_string (gl_api);
GST_INFO ("available GL APIs: %s", api_string);
if (((compiled_api & gl_api) & user_api) == GST_GL_API_NONE) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_WRONG_API,
"failed to create context, context "
"could not provide correct api. user (%s), compiled (%s), context (%s)",
user_api_string, compiled_api_s, api_string);
g_free (api_string);
g_free (compiled_api_s);
g_free (user_api_string);
goto failure;
}
g_free (api_string);
g_free (compiled_api_s);
g_free (user_api_string);
gl->GetError = gst_gl_context_get_proc_address (context, "glGetError");
gl->GetString = gst_gl_context_get_proc_address (context, "glGetString");
gl->GetStringi = gst_gl_context_get_proc_address (context, "glGetStringi");
gl->GetIntegerv = gst_gl_context_get_proc_address (context, "glGetIntegerv");
if (!gl->GetError || !gl->GetString) {
g_set_error (error, GST_GL_CONTEXT_ERROR, GST_GL_CONTEXT_ERROR_FAILED,
"could not GetProcAddress core opengl functions");
goto failure;
}
/* gl api specific code */
ret = _create_context_info (context, gl_api, &context->priv->gl_major,
&context->priv->gl_minor, error);
if (!ret) {
g_assert (error == NULL || *error != NULL);
goto failure;
}
/* GL core contexts and GLES3 */
if (gl->GetIntegerv && gl->GetStringi && context->priv->gl_major >= 3)
ext_g_str = _build_extension_string (context);
if (ext_g_str && ext_g_str->len) {
GST_DEBUG_OBJECT (context, "GL_EXTENSIONS: %s", ext_g_str->str);
_gst_gl_feature_check_ext_functions (context, context->priv->gl_major,
context->priv->gl_minor, ext_g_str->str);
context->priv->gl_exts = g_string_free (ext_g_str, FALSE);
} else {
ext_const_c_str = (const gchar *) gl->GetString (GL_EXTENSIONS);
if (!ext_const_c_str)
ext_const_c_str = "";
GST_DEBUG_OBJECT (context, "GL_EXTENSIONS: %s", ext_const_c_str);
_gst_gl_feature_check_ext_functions (context, context->priv->gl_major,
context->priv->gl_minor, ext_const_c_str);
context->priv->gl_exts = g_strdup (ext_const_c_str);
}
context->priv->alive = TRUE;
if (gl->DebugMessageCallback) {
#if !defined(GST_DISABLE_GST_DEBUG)
GST_INFO ("Enabling GL context debugging");
/* enable them all */
gl->DebugMessageControl (GL_DONT_CARE, GL_DONT_CARE, GL_DONT_CARE, 0, 0,
GL_TRUE);
gl->DebugMessageCallback (_gst_gl_debug_callback, context);
#endif
}
if (other_context)
gst_object_unref (other_context);
g_cond_signal (&context->priv->create_cond);
// g_mutex_unlock (&context->priv->render_lock);
gst_gl_window_send_message_async (context->window,
(GstGLWindowCB) _unlock_create_thread, context, NULL);
gst_gl_window_run (context->window);
GST_INFO ("loop exited\n");
g_mutex_lock (&context->priv->render_lock);
context->priv->alive = FALSE;
context_class->activate (context, FALSE);
context_class->destroy_context (context);
/* User supplied callback */
if (context->window->close)
context->window->close (context->window->close_data);
/* window specific shutdown */
if (window_class->close) {
window_class->close (context->window);
}
g_cond_signal (&context->priv->destroy_cond);
g_mutex_unlock (&context->priv->render_lock);
return NULL;
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;
}
}
/**
* gst_gl_context_destroy:
* @context: a #GstGLContext:
*
* Destroys an OpenGL context.
*
* Should only be called after gst_gl_context_create() has been successfully
* called for this context.
*/
void
gst_gl_context_destroy (GstGLContext * context)
{
GstGLContextClass *context_class;
g_return_if_fail (GST_GL_IS_CONTEXT (context));
context_class = GST_GL_CONTEXT_GET_CLASS (context);
g_return_if_fail (context_class->destroy_context != NULL);
context_class->destroy_context (context);
}
/**
* gst_gl_context_get_gl_context:
* @context: a #GstGLContext:
*
* Gets the backing OpenGL context used by @context.
*
* Returns: The platform specific backing OpenGL context
*/
guintptr
gst_gl_context_get_gl_context (GstGLContext * context)
{
GstGLContextClass *context_class;
guintptr result;
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), 0);
context_class = GST_GL_CONTEXT_GET_CLASS (context);
g_return_val_if_fail (context_class->get_gl_context != NULL, 0);
result = context_class->get_gl_context (context);
return result;
}
/**
* gst_gl_context_get_gl_platform:
* @context: a #GstGLContext:
*
* Gets the OpenGL platform that used by @context.
*
* Returns: The platform specific backing OpenGL context
*/
GstGLPlatform
gst_gl_context_get_gl_platform (GstGLContext * context)
{
GstGLContextClass *context_class;
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), 0);
context_class = GST_GL_CONTEXT_GET_CLASS (context);
g_return_val_if_fail (context_class->get_gl_platform != NULL, 0);
return context_class->get_gl_platform (context);
}
/**
* gst_gl_context_get_display:
* @context: a #GstGLContext:
*
* Returns: the #GstGLDisplay associated with this @context
*/
GstGLDisplay *
gst_gl_context_get_display (GstGLContext * context)
{
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), NULL);
return gst_object_ref (context->priv->display);
}
typedef struct
{
GstGLContext *context;
GstGLContextThreadFunc func;
gpointer data;
} RunGenericData;
static void
_gst_gl_context_thread_run_generic (RunGenericData * data)
{
GST_TRACE ("running function:%p data:%p", data->func, data->data);
data->func (data->context, data->data);
}
/**
* gst_gl_context_thread_add:
* @context: a #GstGLContext
* @func: a #GstGLContextThreadFunc
* @data: (closure): user data to call @func with
*
* Execute @func in the OpenGL thread of @context with @data
*
* MT-safe
*/
void
gst_gl_context_thread_add (GstGLContext * context,
GstGLContextThreadFunc func, gpointer data)
{
GstGLWindow *window;
RunGenericData rdata;
g_return_if_fail (GST_GL_IS_CONTEXT (context));
g_return_if_fail (func != NULL);
g_return_if_fail (!GST_GL_IS_WRAPPED_CONTEXT (context));
rdata.context = context;
rdata.data = data;
rdata.func = func;
window = gst_gl_context_get_window (context);
gst_gl_window_send_message (window,
GST_GL_WINDOW_CB (_gst_gl_context_thread_run_generic), &rdata);
gst_object_unref (window);
}
/**
* gst_gl_context_get_gl_version:
* @context: a #GstGLContext
* @maj: (out): resulting major version
* @min: (out): resulting minor version
*
* Returns the OpenGL version implemented by @context. See
* gst_gl_context_get_gl_api() for retreiving the OpenGL api implemented by
* @context.
*/
void
gst_gl_context_get_gl_version (GstGLContext * context, gint * maj, gint * min)
{
g_return_if_fail (GST_GL_IS_CONTEXT (context));
g_return_if_fail (maj == NULL && min == NULL);
if (maj)
*maj = context->priv->gl_major;
if (min)
*min = context->priv->gl_minor;
}
/**
* gst_gl_context_check_gl_version:
* @context: a #GstGLContext
* @api: api type required
* @maj: major version required
* @min: minor version required
*
* Returns: whether OpenGL context implements the required api and specified
* version.
*/
gboolean
gst_gl_context_check_gl_version (GstGLContext * context, GstGLAPI api,
gint maj, gint min)
{
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), FALSE);
if (maj > context->priv->gl_major)
return FALSE;
if ((gst_gl_context_get_gl_api (context) & api) == GST_GL_API_NONE)
return FALSE;
if (maj < context->priv->gl_major)
return TRUE;
if (min > context->priv->gl_minor)
return FALSE;
return TRUE;
}
/**
* gst_gl_context_check_feature:
* @context: a #GstGLContext
* @feature: a platform specific feature
*
* Some features require that the context be created before it is possible to
* determine their existence and so will fail if that is not the case.
*
* Returns: Whether @feature is supported by @context
*/
gboolean
gst_gl_context_check_feature (GstGLContext * context, const gchar * feature)
{
GstGLContextClass *context_class;
g_return_val_if_fail (GST_GL_IS_CONTEXT (context), FALSE);
g_return_val_if_fail (feature != NULL, FALSE);
context_class = GST_GL_CONTEXT_GET_CLASS (context);
if (g_strstr_len (feature, 3, "GL_"))
return gst_gl_check_extension (feature, context->priv->gl_exts);
if (!context_class->check_feature)
return FALSE;
return context_class->check_feature (context, feature);
}
static GstGLAPI
gst_gl_wrapped_context_get_gl_api (GstGLContext * context)
{
GstGLWrappedContext *context_wrap = GST_GL_WRAPPED_CONTEXT (context);
return context_wrap->available_apis;
}
static guintptr
gst_gl_wrapped_context_get_gl_context (GstGLContext * context)
{
GstGLWrappedContext *context_wrap = GST_GL_WRAPPED_CONTEXT (context);
return context_wrap->handle;
}
static GstGLPlatform
gst_gl_wrapped_context_get_gl_platform (GstGLContext * context)
{
GstGLWrappedContext *context_wrap = GST_GL_WRAPPED_CONTEXT (context);
return context_wrap->platform;
}
static gboolean
gst_gl_wrapped_context_activate (GstGLContext * context, gboolean activate)
{
g_assert_not_reached ();
return FALSE;
}
static void
gst_gl_wrapped_context_class_init (GstGLWrappedContextClass * klass)
{
GstGLContextClass *context_class = (GstGLContextClass *) klass;
context_class->get_gl_context =
GST_DEBUG_FUNCPTR (gst_gl_wrapped_context_get_gl_context);
context_class->get_gl_api =
GST_DEBUG_FUNCPTR (gst_gl_wrapped_context_get_gl_api);
context_class->get_gl_platform =
GST_DEBUG_FUNCPTR (gst_gl_wrapped_context_get_gl_platform);
context_class->activate = GST_DEBUG_FUNCPTR (gst_gl_wrapped_context_activate);
}
static void
gst_gl_wrapped_context_init (GstGLWrappedContext * context)
{
}
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