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gstreamer/gst-libs/gst/gl/gstglcontext.c
Edward Hervey ef00d85f16 glcontext: Initialize variable 
Avoids the following warning:

gstglcontext.c:647:58: error: 'prev' may be used uninitialized in
 this function [-Werror=maybe-uninitialized]
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 = NULL;
/* 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], [d, f], [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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