gfx/gl/GLContextProviderImpl.h
author Justin Lebar <justin.lebar@gmail.com>
Wed, 24 Oct 2012 12:40:35 -0400
changeset 111263 592c3465a74231069e07b10b2a072b54ea0f06b0
parent 100772 f58214b53c9aa7d8c7e7db18f4c8ca9ff5f1191f
child 121814 38c7d7a7f58629f1dca230687f9223818dd0f0a6
permissions -rw-r--r--
Bug 803688 - Remove LinkedListElements from their list when they're destructed, and assert that a LinkedList is empty when it's destructed. r=waldo

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef IN_GL_CONTEXT_PROVIDER_H
#error GLContextProviderImpl.h must only be included from GLContextProvider.h
#endif

#ifndef GL_CONTEXT_PROVIDER_NAME
#error GL_CONTEXT_PROVIDER_NAME not defined
#endif

class THEBES_API GL_CONTEXT_PROVIDER_NAME
{
public:
    typedef GLContext::ContextFlags ContextFlags;
    /**
     * Create a context that renders to the surface of the widget that is
     * passed in.  The context is always created with an RGB pixel format,
     * with no alpha, depth or stencil.  If any of those features are needed,
     * either use a framebuffer, or use CreateOffscreen.
     *
     * This context will attempt to share resources with all other window
     * contexts.  As such, it's critical that resources allocated that are not
     * needed by other contexts be deleted before the context is destroyed.
     *
     * The GetSharedContext() method will return non-null if sharing
     * was successful.
     *
     * Note: a context created for a widget /must not/ hold a strong
     * reference to the widget; otherwise a cycle can be created through
     * a GL layer manager.
     *
     * @param aWidget Widget whose surface to create a context for
     *
     * @return Context to use for the window
     */
    static already_AddRefed<GLContext>
    CreateForWindow(nsIWidget *aWidget);

    /**
     * Create a context for offscreen rendering.  The target of this
     * context should be treated as opaque -- it might be a FBO, or a
     * pbuffer, or some other construct.  Users of this GLContext
     * should not bind framebuffer 0 directly, and instead should bind
     * the framebuffer returned by GetOffscreenFBO().
     *
     * The offscreen context returned by this method will always have
     * the ability to be rendered into a context created by a window.
     * It might or might not share resources with the global context;
     * query GetSharedContext() for a non-null result to check.  If
     * resource sharing can be avoided on the target platform, it will
     * be, in order to isolate the offscreen context.
     *
     * @param aSize The initial size of this offscreen context.
     * @param aFormat The ContextFormat for this offscreen context.
     *
     * @return Context to use for offscreen rendering
     */
    static already_AddRefed<GLContext>
    CreateOffscreen(const gfxIntSize& aSize,
                    const ContextFormat& aFormat = ContextFormat::BasicRGBA32Format,
                    const ContextFlags aFlags = GLContext::ContextFlagsNone);

    /**
     * Get a pointer to the global context, creating it if it doesn't exist.
     */
    static GLContext *
    GetGlobalContext( const ContextFlags aFlags = GLContext::ContextFlagsNone);

    /**
     * Free any resources held by this Context Provider.
     */
    static void
    Shutdown();
};