Added SDL2 timers #12
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Just took a peek at SDL_AddTimer and it does indeed fire it from a worker thread. All the UI code assumes timer callbacks run on the UI thread, so for this to work safely the callback passed to SDL_AddTimer will have to then call SDL_PushEvent with a custom event. If I understand SDL_PushEvent correctly, the event must first be registered using SDL_RegisterEvents. Then in the event loop where it checks all the other events it can then check for this custom event and dispatch it to a zwidget timer callback. |
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Yeah, for some reason the event id I put in to the event (which comes from SDL_RegisterEvents), is different by 1 from the event that is received by the event loop. I'll take another crack at it today |
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Ahh, figured it out. The event was being filtered by windowevent, so the only user event I was seeing was from paintevent. Paintevents just happen to be fired when I was expecting to see the timer event, so I got confused. |
This was built and texted in the gzdoom repo, which seems to not be up-to-date. I hope everything works here
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This was built and texted in the gzdoom repo, which seems to not be up-to-date. I hope everything works here.
I'm a little worried about the onTimer function being called from a background thread, instead of the event loop. I tried to implement with pushing events to the main thread, but for some reason I'm unable to receive user events.