Duration of the last update

[j-jorge]

Axmol has a feature to display the FPS counter over the UI via ax::Director::setStatsDisplay(). I would like this function to also display the duration of the last update. Ideally I would like to be able to retrieve this duration too, so I can plot them.

The problem I would like to solve with this is the following. If I add a processing that turns my update from 2 ms to 15 ms, it is a very expensive processing, but I won't see it because the FPS counter would still be at 60. It's only when I'll introduce the next feature that would costs 2 ms (for example) that I would see a drop. Unfortunately it would be quite late.

[rh101]

I would like this function to also display the duration of the last update.

Isn't this the value you're after:

That is the duration of the update. Isn't it displaying the correct value for you?

To read the value, use Director::getSecondsPerFrame().

[j-jorge]

This is not what I'm looking for :) If I tracked this value correctly this is based on _deltaTime, which is computed in calculateDeltaTime() as the time since the last call. Consequently it includes the call to sleep() that happened in between. What I'm looking for is the time it took to go from the opening brace of mainLoop() to the closing brace.

[rh101]

In that case, have you tried using listeners for events that are dispatched from the mainLoop? Specifically, these events:

const char* Director::EVENT_AFTER_DRAW            = "director_after_draw";
const char* Director::EVENT_AFTER_VISIT           = "director_after_visit";
const char* Director::EVENT_BEFORE_UPDATE         = "director_before_update";
const char* Director::EVENT_AFTER_UPDATE          = "director_after_update";
const char* Director::EVENT_BEFORE_DRAW           = "director_before_draw";

A combination of them should provide the timings you are after. Refer to the mainLoop implementation to see when each event is dispatched.