Handling lost gpu context on stage3d

[Antriel]

Primitive way to handle lost context. Keeps texture data in memory when created via createTextureFromImage. Custom made textures need to listen on hasGPU and recreate manually.
usage - add compiler flag:
-D stage3d_handle_context_loss

Notes:

• Increases memory usage. If that is a problem it should be possible to reload the data from source, I didn't need it though and it would be more complicated. @purplepwny has implemented embedded assets with flash preloader, which I improved for my needs. There it would make more sense to load from source (since it's embedded).
• For some reason my builds sometimes fail with flambe.platform.BasicTexture.R has no field readPixels/writePixels/createTexture. If I remove @:generic from BasicTexture it works. It also works if I return back again after it compiled first time. Not sure what is going on.
• Fixes Error #3694 After locking the computer #217

[markknol]

Very nice! Could it be optional to store all bitmaps in memory? Maybe I'm okay just by restart+reloading the app.

[Antriel]

Well now it shouldn't crash even if you don't enable handling of context loss. So you should be able to just listen to when GPU context is recreated and restart the game.

[markknol]

Ah that is awesome! Will try soon! 👍

[elibroide]

Hey guys, did it work for anyone?
I'm having some trouble with context lost after showing the users a video commercial