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Make various forms of throttling more consistent and give it a chance of actually reaching target.

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This commit is contained in:
Howard Stearns 2015-12-02 21:48:06 -08:00
parent 53bfcd17e2
commit ed86a88083
1 changed files with 7 additions and 5 deletions
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12
libraries/display-plugins/src/display-plugins/Basic2DWindowOpenGLDisplayPlugin.cpp
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@ -90,12 +90,8 @@ void Basic2DWindowOpenGLDisplayPlugin::display(GLuint sceneTexture, const glm::u
int Basic2DWindowOpenGLDisplayPlugin::getDesiredInterval() const {
static const int THROTTLED_PAINT_TIMER_DELAY_MS = MSECS_PER_SECOND / 15;
static const int ULIMIITED_PAINT_TIMER_DELAY_MS = 1;
int result = ULIMIITED_PAINT_TIMER_DELAY_MS;
if (_isThrottled) {
result = THROTTLED_PAINT_TIMER_DELAY_MS;
}
if (0 != _framerateTarget) {
result = MSECS_PER_SECOND / _framerateTarget;
}
@ -139,12 +135,18 @@ void Basic2DWindowOpenGLDisplayPlugin::updateFramerate() {
} else if (FRAMERATE_30 == actionText) {
_framerateTarget = 30;
}
} else if (_isThrottled) {
_framerateTarget = 15;
}
_inverseFrameRate = _framerateTarget ? 1.0f / (float) _framerateTarget : 1.0f / TARGET_FRAMERATE_Basic2DWindowOpenGL; // not truncated
int newInterval = getDesiredInterval();
if (_framerateTarget) { // For any target other than vsync, we have little hope of achieving it with timer alone:
const int ALLOWANCE_FOR_DISPLAY_FINISHFRAME_AND_TIMER = 3; // ideally a windowed average of qApp->getLastPaintWait and then some, but not worth the complexity
newInterval -= ALLOWANCE_FOR_DISPLAY_FINISHFRAME_AND_TIMER; // Otherwise, any controller expecting us to hit "target" will always be disappointed.
}
qDebug() << newInterval;
_timer.start(getDesiredInterval());
_timer.start(newInterval);
}
// FIXME target the screen the window is currently on