// Step & render.
void GraphicsCanvas::nextFrame()
{
float timeStep = (float) m_hrTimer.seconds();
// Measure frame time
m_hrTimer.tick();
// Step & render
Q_EMIT step(timeStep);
if (this->isVisible() && this->size() == m_lastSize)
{
if (m_officialSize != this->size())
{
m_officialSize = this->size();
Q_EMIT resized(m_officialSize.width(), m_officialSize.height());
}
// Draw scene
Q_EMIT render();
present();
}
m_lastSize = this->size();
// Compute time to next frame
int targetFrameDelay = 1000 / targetFPS() - (int) m_hrTimer.milliseconds();
// Enqueue next frame
if (!this->isHidden())
m_timer.start( lean::max(targetFrameDelay, 0) );
}
void DemoApplication::update(const OTimeIndex& timeIndex)
{
int deltaTime_us = (timeIndex - _last_timeIndex).toInt();
char buff[128];
/* update camera */
_camCtrl.update(timeIndex);
/* calculate FPS average and update the text object (to show on the screen) */
if (targetFPS() == 0) snprintf(buff, 32, "%.02f fps", fpsStats().average());
else snprintf(buff, 32, "%.02f/%d fps", fpsStats().average(), targetFPS());
_fpsText->setContent(buff);
/* simulation stats and idle time */
snprintf(buff, 32, "Perf coef: %.04f", performanceStats().average());
_perfText->setContent(buff);
snprintf(buff, 32, "Idle time: %.02f", idleTimeStats().average());
_idleText->setContent(buff);
snprintf(buff, 32, "Render time: %.02f", renderTimeStats().average());
_renderText->setContent(buff);
OVector3 camSpeed = camera()->state()->motionComponent(1, OState::Scene) * 1e6;
OVector3 orientation = camera()->state()->orientation().toEulerAngles();
snprintf(buff, 128, "Camera @ (%.02f, %.02f, %.02f), spd: (%.02f, %.02f, %.02f)/sec, or: Euler(%.02f, %.02f, %.02f)",
camera()->position().x(), camera()->position().y(), camera()->position().z(),
camSpeed.x(), camSpeed.y(), camSpeed.z(),
orientation.x(), orientation.y(), orientation.z()
);
_cameraText->setContent(buff);
/* calculating new positions */
if (!_pauseFlag) {
_thetaA = _thetaA + 2 * PI * deltaTime_us / (_periodA * 1000000);
_thetaB = _thetaB + 2 * PI * deltaTime_us / (_periodB * 1000000);
if (_thetaA > 2 * PI) _thetaA -= 2 * PI;
if (_thetaB > 2 * PI) _thetaB -= 2 * PI;
}
/* update last time index */
_last_timeIndex = timeIndex;
}
void DemoApplication::onKeyboardPress(const OKeyboardPressEvent *evt)
{
switch (evt->code()) {
case OKeyboardPressEvent::OKey_Space:
_pauseFlag = !_pauseFlag;
break;
case OKeyboardPressEvent::OKey_L:
case OKeyboardPressEvent::OKey_l:
setTargetFPS((targetFPS() == 0) ? 40 : 0);
break;
}
}
