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#include "swaphook.h"
#include <cstdio>
#include <ctime>
#include <QObject>
#include <QEvent>
#include <QDebug>
#include <QTimer>
#include <MApplication>
#include <MWindow>
#ifdef EGL
#include <dlfcn.h>
#endif
class SwapHookPrivate : public QObject
{
Q_OBJECT
public:
SwapHookPrivate();
~SwapHookPrivate();
bool eventFilter(QObject *object, QEvent *e);
void frameFinished();
#ifdef EGL
EGLBoolean eglSwapBuffers(EGLDisplay dpy, EGLSurface surface);
typedef EGLAPI EGLBoolean EGLAPIENTRY (*eglSwapBuffers_ptr)(EGLDisplay dpy, EGLSurface surface);
eglSwapBuffers_ptr func;
#else
void *func;
#endif
void *lib;
bool lurk;
timestamp lurkBegin;
bool firstTimestamp;
QLinkedList<timestamp> stamps;
};
class Clock
{
public:
static timestamp time();
};
#ifdef EGL
extern "C" EGLAPI EGLBoolean EGLAPIENTRY eglSwapBuffers(EGLDisplay dpy, EGLSurface surface)
{
return SwapHook::instance()->d->eglSwapBuffers(dpy, surface);
}
#endif
timestamp Clock::time()
{
// TODO: port this to QElapsedTimer once we have Qt 4.7
#ifdef Q_OS_LINUX
struct timespec now;
if(clock_gettime(CLOCK_MONOTONIC, &now))
qFatal("clock_gettime errored");
return ((timestamp)(now.tv_sec))*1000 + now.tv_nsec / 1000000;
#else
qFatal("swap monitoring on this operating system is not supported right now");
return 0;
#endif
}
SwapHookPrivate::SwapHookPrivate() :
QObject(),
func(0),
lib(0),
lurk(false),
lurkBegin(0),
firstTimestamp(true),
stamps()
{
#ifdef EGL
QString preload = qgetenv("LD_PRELOAD");
QStringList libs = preload.split(':', QString::SkipEmptyParts);
libs << QString("libEGL.so");
foreach (const QString& candidate, libs) {
lib = dlopen(candidate.toAscii().data(), RTLD_NOW);
if(!lib) {
qWarning("%s:%d: can't dlopen %s (%s)\n", __FILE__, __LINE__, qPrintable(candidate), dlerror());
continue;
}
func = (eglSwapBuffers_ptr)dlsym(lib, "eglSwapBuffers");
if(!func) {
qWarning("%s:%d: can't find eglSwapBuffers from %s (%s)\n", __FILE__, __LINE__, qPrintable(candidate), dlerror());
continue;
}
return;
}
qFatal("%s:%d: failed to redirect eglSwapBuffers()", __FILE__, __LINE__);
#endif
}
SwapHookPrivate::~SwapHookPrivate()
{
#ifdef EGL
if(lib) {
dlclose(lib);
}
#endif
}
bool SwapHookPrivate::eventFilter(QObject *object, QEvent *e) {
if (e->type() == QEvent::Paint) {
frameFinished();
}
return QObject::eventFilter(object, e);
}
#ifdef EGL
EGLBoolean SwapHookPrivate::eglSwapBuffers(EGLDisplay dpy, EGLSurface surface)
{
if (!func)
qFatal("SwapHook object not properly initialized");
frameFinished();
return func(dpy, surface);
}
#endif
void SwapHookPrivate::frameFinished() {
if (lurk) {
timestamp ts = Clock::time();
if (firstTimestamp) {
lurkBegin = ts;
firstTimestamp = false;
}
stamps.push_back(ts);
if (!MApplication::showFps()) {
// Update again on return to the main loop, in order to refresh
// the scene as frequently as possible for benchmark purposes.
QTimer::singleShot(0, MApplication::activeWindow()->viewport(), SLOT(update()));
}
}
}
SwapHook::SwapHook()
: QObject(),
d(new SwapHookPrivate)
{
}
SwapHook::~SwapHook()
{
}
SwapHook* SwapHook::instance() {
static SwapHook *gSwapHook = 0;
if (!gSwapHook) {
gSwapHook = new SwapHook();
}
return gSwapHook;
}
void SwapHook::startLurking()
{
if(d->lurk)
return;
if (!d->func) {
// fallback to even filtering as swap buffer monitoring is not available
MApplication::activeWindow()->viewport()->installEventFilter(d.data());
}
d->stamps.clear();
d->lurk = true;
d->firstTimestamp = true;
MApplication::activeWindow()->viewport()->update();
}
void SwapHook::stopLurking()
{
if(!(d->lurk))
return;
if (!d->func) {
MApplication::activeWindow()->viewport()->removeEventFilter(d.data());
}
d->lurk = false;
}
QLinkedList<timestamp> SwapHook::timestamps() {
return d->stamps;
}
#include "swaphook.moc"
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