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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QDebug>
#include <QLibrary>
#include "qxcbwindow.h"
#include "qxcbscreen.h"
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <GL/glx.h>
#include <QtGui/QOpenGLContext>
#include "qglxintegration.h"
#include <QtPlatformSupport/private/qglxconvenience_p.h>
#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
#include <dlfcn.h>
#endif
QT_BEGIN_NAMESPACE
typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
#ifndef GLX_CONTEXT_CORE_PROFILE_BIT_ARB
#define GLX_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001
#endif
#ifndef GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB
#define GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002
#endif
#ifndef GLX_CONTEXT_PROFILE_MASK_ARB
#define GLX_CONTEXT_PROFILE_MASK_ARB 0x9126
#endif
QGLXContext::QGLXContext(QXcbScreen *screen, const QSurfaceFormat &format, QPlatformOpenGLContext *share)
: QPlatformOpenGLContext()
, m_screen(screen)
, m_context(0)
, m_format(format)
{
m_shareContext = 0;
if (share)
m_shareContext = static_cast<const QGLXContext*>(share)->glxContext();
GLXFBConfig config = qglx_findConfig(DISPLAY_FROM_XCB(screen),screen->screenNumber(),format);
if (config) {
// Resolve entry point for glXCreateContextAttribsARB
glXCreateContextAttribsARBProc glXCreateContextAttribsARB = 0;
glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc) glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");
if (glXCreateContextAttribsARB != 0) {
QVector<int> contextAttributes;
contextAttributes << GLX_CONTEXT_MAJOR_VERSION_ARB << m_format.majorVersion()
<< GLX_CONTEXT_MINOR_VERSION_ARB << m_format.minorVersion();
if (m_format.majorVersion() > 3 || (m_format.majorVersion() == 3 && m_format.minorVersion() > 1)) {
if (m_format.profile() == QSurfaceFormat::CoreProfile) {
contextAttributes << GLX_CONTEXT_FLAGS_ARB << GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB
<< GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_CORE_PROFILE_BIT_ARB;
} else {
contextAttributes << GLX_CONTEXT_PROFILE_MASK_ARB << GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
}
}
contextAttributes << None;
m_context = glXCreateContextAttribsARB(DISPLAY_FROM_XCB(screen), config, m_shareContext, true, contextAttributes.data());
if (!m_context && m_shareContext) {
// re-try without a shared glx context
m_context = glXCreateContextAttribsARB(DISPLAY_FROM_XCB(screen), config, 0, true, contextAttributes.data());
if (m_context)
m_shareContext = 0;
}
}
// Could not create a context using glXCreateContextAttribsARB, falling back to glXCreateNewContext.
if (!m_context) {
m_context = glXCreateNewContext(DISPLAY_FROM_XCB(screen), config, GLX_RGBA_TYPE, m_shareContext, true);
if (!m_context && m_shareContext) {
// re-try without a shared glx context
m_context = glXCreateNewContext(DISPLAY_FROM_XCB(screen), config, GLX_RGBA_TYPE, 0, true);
if (m_context)
m_shareContext = 0;
}
}
if (m_context) {
m_format = qglx_surfaceFormatFromGLXFBConfig(DISPLAY_FROM_XCB(screen), config, m_context);
m_format.setMajorVersion(format.majorVersion());
m_format.setMinorVersion(format.minorVersion());
m_format.setProfile(format.profile());
}
} else {
XVisualInfo *visualInfo = qglx_findVisualInfo(DISPLAY_FROM_XCB(m_screen), screen->screenNumber(), &m_format);
if (!visualInfo)
qFatal("Could not initialize GLX");
m_context = glXCreateContext(DISPLAY_FROM_XCB(screen), visualInfo, m_shareContext, true);
if (!m_context && m_shareContext) {
// re-try without a shared glx context
m_shareContext = 0;
m_context = glXCreateContext(DISPLAY_FROM_XCB(screen), visualInfo, 0, true);
}
XFree(visualInfo);
}
}
QGLXContext::~QGLXContext()
{
glXDestroyContext(DISPLAY_FROM_XCB(m_screen), m_context);
}
bool QGLXContext::makeCurrent(QPlatformSurface *surface)
{
Q_ASSERT(surface->surface()->surfaceType() == QSurface::OpenGLSurface);
GLXDrawable glxDrawable = static_cast<QXcbWindow *>(surface)->xcb_window();
return glXMakeCurrent(DISPLAY_FROM_XCB(m_screen), glxDrawable, m_context);
}
void QGLXContext::doneCurrent()
{
glXMakeCurrent(DISPLAY_FROM_XCB(m_screen), 0, 0);
}
void QGLXContext::swapBuffers(QPlatformSurface *surface)
{
GLXDrawable glxDrawable = static_cast<QXcbWindow *>(surface)->xcb_window();
glXSwapBuffers(DISPLAY_FROM_XCB(m_screen), glxDrawable);
}
void (*QGLXContext::getProcAddress(const QByteArray &procName)) ()
{
typedef void *(*qt_glXGetProcAddressARB)(const GLubyte *);
static qt_glXGetProcAddressARB glXGetProcAddressARB = 0;
static bool resolved = false;
if (resolved && !glXGetProcAddressARB)
return 0;
if (!glXGetProcAddressARB) {
QList<QByteArray> glxExt = QByteArray(glXGetClientString(DISPLAY_FROM_XCB(m_screen), GLX_EXTENSIONS)).split(' ');
if (glxExt.contains("GLX_ARB_get_proc_address")) {
#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
void *handle = dlopen(NULL, RTLD_LAZY);
if (handle) {
glXGetProcAddressARB = (qt_glXGetProcAddressARB) dlsym(handle, "glXGetProcAddressARB");
dlclose(handle);
}
if (!glXGetProcAddressARB)
#endif
{
extern const QString qt_gl_library_name();
// QLibrary lib(qt_gl_library_name());
QLibrary lib(QLatin1String("GL"));
glXGetProcAddressARB = (qt_glXGetProcAddressARB) lib.resolve("glXGetProcAddressARB");
}
}
resolved = true;
}
if (!glXGetProcAddressARB)
return 0;
return (void (*)())glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(procName.constData()));
}
QSurfaceFormat QGLXContext::format() const
{
return m_format;
}
bool QGLXContext::isSharing() const
{
return m_shareContext != 0;
}
bool QGLXContext::isValid() const
{
return m_context != 0;
}
QT_END_NAMESPACE
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