void *QGLContext::getProcAddress(const QString &proc) const
{
typedef void *(*qt_glXGetProcAddressARB)(const GLubyte *);
static qt_glXGetProcAddressARB glXGetProcAddressARB = 0;
static bool resolved = false;
if (resolved && !glXGetProcAddressARB)
return 0;
if (!glXGetProcAddressARB) {
QString glxExt = QString(QLatin1String(glXGetClientString(QX11Info::display(), GLX_EXTENSIONS)));
if (glxExt.contains(QLatin1String("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());
glXGetProcAddressARB = (qt_glXGetProcAddressARB) lib.resolve("glXGetProcAddressARB");
}
}
resolved = true;
}
if (!glXGetProcAddressARB)
return 0;
return glXGetProcAddressARB(reinterpret_cast<const GLubyte *>(proc.toLatin1().data()));
}
static bool qt_resolve_pbuffer_extensions()
{
static int resolved = false;
if (resolved && qt_glXMakeContextCurrent)
return true;
else if (resolved)
return false;
#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
void *handle = dlopen(NULL, RTLD_LAZY);
if (handle) {
qt_glXChooseFBConfig = (_glXChooseFBConfig) dlsym(handle, "glXChooseFBConfig");
qt_glXCreateNewContext = (_glXCreateNewContext) dlsym(handle, "glXCreateNewContext");
qt_glXCreatePbuffer = (_glXCreatePbuffer) dlsym(handle, "glXCreatePbuffer");
qt_glXDestroyPbuffer = (_glXDestroyPbuffer) dlsym(handle, "glXDestroyPbuffer");
qt_glXGetFBConfigAttrib = (_glXGetFBConfigAttrib) dlsym(handle, "glXGetFBConfigAttrib");
qt_glXMakeContextCurrent = (_glXMakeContextCurrent) dlsym(handle, "glXMakeContextCurrent");
dlclose(handle);
}
if (!qt_glXChooseFBConfig)
#endif
{
extern const QString qt_gl_library_name();
QLibrary gl(qt_gl_library_name());
qt_glXChooseFBConfig = (_glXChooseFBConfig) gl.resolve("glXChooseFBConfig");
qt_glXCreateNewContext = (_glXCreateNewContext) gl.resolve("glXCreateNewContext");
qt_glXCreatePbuffer = (_glXCreatePbuffer) gl.resolve("glXCreatePbuffer");
qt_glXDestroyPbuffer = (_glXDestroyPbuffer) gl.resolve("glXDestroyPbuffer");
qt_glXGetFBConfigAttrib = (_glXGetFBConfigAttrib) gl.resolve("glXGetFBConfigAttrib");
qt_glXMakeContextCurrent = (_glXMakeContextCurrent) gl.resolve("glXMakeContextCurrent");
}
resolved = qt_glXMakeContextCurrent ? true : false;
return resolved;
}
void QGLContext::swapBuffers() const
{
Q_D(const QGLContext);
if (!d->valid)
return;
if (!deviceIsPixmap()) {
int interval = d->glFormat.swapInterval();
if (interval > 0) {
typedef int (*qt_glXGetVideoSyncSGI)(uint *);
typedef int (*qt_glXWaitVideoSyncSGI)(int, int, uint *);
static qt_glXGetVideoSyncSGI glXGetVideoSyncSGI = 0;
static qt_glXWaitVideoSyncSGI glXWaitVideoSyncSGI = 0;
static bool resolved = false;
if (!resolved) {
QString glxExt = QString(QLatin1String(glXGetClientString(QX11Info::display(), GLX_EXTENSIONS)));
if (glxExt.contains(QLatin1String("GLX_SGI_video_sync"))) {
#if defined(Q_OS_LINUX) || defined(Q_OS_BSD4)
void *handle = dlopen(NULL, RTLD_LAZY);
if (handle) {
glXGetVideoSyncSGI = (qt_glXGetVideoSyncSGI) dlsym(handle, "glXGetVideoSyncSGI");
glXWaitVideoSyncSGI = (qt_glXWaitVideoSyncSGI) dlsym(handle, "glXWaitVideoSyncSGI");
dlclose(handle);
}
if (!glXGetVideoSyncSGI)
#endif
{
extern const QString qt_gl_library_name();
QLibrary lib(qt_gl_library_name());
glXGetVideoSyncSGI = (qt_glXGetVideoSyncSGI) lib.resolve("glXGetVideoSyncSGI");
glXWaitVideoSyncSGI = (qt_glXWaitVideoSyncSGI) lib.resolve("glXWaitVideoSyncSGI");
}
}
resolved = true;
}
if (glXGetVideoSyncSGI && glXWaitVideoSyncSGI) {
uint counter;
if (!glXGetVideoSyncSGI(&counter))
glXWaitVideoSyncSGI(interval + 1, (counter + interval) % (interval + 1), &counter);
}
}
glXSwapBuffers(qt_x11Info(d->paintDevice)->display(),
static_cast<QWidget *>(d->paintDevice)->winId());
}
}
