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/*
* Copyright (C) 2011, 2012 Igalia, S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "GLContext.h"
#if USE(OPENGL)
#include "GLContextEGL.h"
#include "GLContextGLX.h"
#include <wtf/MainThread.h>
#if PLATFORM(X11)
#include <X11/Xlib.h>
#endif
namespace WebCore {
GLContext* GLContext::sharingContext()
{
ASSERT(isMainThread());
DEFINE_STATIC_LOCAL(OwnPtr<GLContext>, sharing, (createOffscreenContext()));
return sharing.get();
}
#if PLATFORM(X11)
// We do not want to call glXMakeContextCurrent using different Display pointers,
// because it might lead to crashes in some drivers (fglrx). We use a shared display
// pointer here.
static Display* gSharedX11Display = 0;
Display* GLContext::sharedX11Display()
{
if (!gSharedX11Display)
gSharedX11Display = XOpenDisplay(0);
return gSharedX11Display;
}
void GLContext::cleanupSharedX11Display()
{
if (!gSharedX11Display)
return;
XCloseDisplay(gSharedX11Display);
gSharedX11Display = 0;
}
#endif // PLATFORM(X11)
// Because of driver bugs, exiting the program when there are active pbuffers
// can crash the X server (this has been observed with the official Nvidia drivers).
// We need to ensure that we clean everything up on exit. There are several reasons
// that GraphicsContext3Ds will still be alive at exit, including user error (memory
// leaks) and the page cache. In any case, we don't want the X server to crash.
typedef Vector<GLContext*> ActiveContextList;
static ActiveContextList& activeContextList()
{
DEFINE_STATIC_LOCAL(ActiveContextList, activeContexts, ());
return activeContexts;
}
void GLContext::addActiveContext(GLContext* context)
{
static bool addedAtExitHandler = false;
if (!addedAtExitHandler) {
atexit(&GLContext::cleanupActiveContextsAtExit);
addedAtExitHandler = true;
}
activeContextList().append(context);
}
static bool gCleaningUpAtExit = false;
void GLContext::removeActiveContext(GLContext* context)
{
// If we are cleaning up the context list at exit, don't bother removing the context
// from the list, since we don't want to modify the list while it's being iterated.
if (gCleaningUpAtExit)
return;
ActiveContextList& contextList = activeContextList();
size_t i = contextList.find(context);
if (i != notFound)
contextList.remove(i);
}
void GLContext::cleanupActiveContextsAtExit()
{
gCleaningUpAtExit = true;
ActiveContextList& contextList = activeContextList();
for (size_t i = 0; i < contextList.size(); ++i)
delete contextList[i];
#if PLATFORM(X11)
cleanupSharedX11Display();
#endif
}
PassOwnPtr<GLContext> GLContext::createContextForWindow(uint64_t windowHandle, GLContext* sharingContext)
{
#if USE(GLX)
if (OwnPtr<GLContext> glxContext = GLContextGLX::createContext(windowHandle, sharingContext))
return glxContext.release();
#endif
#if USE(EGL)
if (OwnPtr<GLContext> eglContext = GLContextEGL::createContext(windowHandle, sharingContext))
return eglContext.release();
#endif
return nullptr;
}
GLContext::GLContext()
{
addActiveContext(this);
}
PassOwnPtr<GLContext> GLContext::createOffscreenContext(GLContext* sharingContext)
{
#if USE(GLX)
if (OwnPtr<GLContext> glxContext = GLContextGLX::createContext(0, sharingContext))
return glxContext.release();
#endif
#if USE(EGL)
if (OwnPtr<GLContext> eglContext = GLContextEGL::createContext(0, sharingContext))
return eglContext.release();
#endif
return nullptr;
}
// FIXME: This should be a thread local eventually if we
// want to support using GLContexts from multiple threads.
static GLContext* gCurrentContext = 0;
GLContext::~GLContext()
{
if (this == gCurrentContext)
gCurrentContext = 0;
removeActiveContext(this);
}
bool GLContext::makeContextCurrent()
{
ASSERT(isMainThread());
gCurrentContext = this;
return true;
}
GLContext* GLContext::getCurrent()
{
ASSERT(isMainThread());
return gCurrentContext;
}
} // namespace WebCore
#endif // USE(OPENGL)
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