Complete ebiten backend

[0xkalle]

Hey,

I'd like to complete the ebiten backend a bit further to be able to use it as backend in giu ( see: AllenDang/giu#1001 ).

As far as I understand there are two problems now, one of which I do not understand.

1. SetShouldClose is not implemented (cimgui_backend_impl.go:89-102)

The problem here is, that a window can not be closed the same way as with a GLFW window (which is closed by setting the shouldClose flag). Instead as I understand it within ebiten you can only terminate "the window" by returning a ebiten.Termination error from the Update function. That works in general, but... see 2)

2. After Terminating a window I get an error I don't understand when creating a new one.

When opening a new window after closing the first one the line result.bgColorMagic.pkgMask1x1 = ebiten.NewImage(1, 1) (ebiten_backend.go:80) causes a panic because calling NewImage() cannot be called after RunGame finished (which it did because of closing the first window).

I don't understand why it complains about the NewImage() call when creating a new backend for the new window.

Any input and ideas are apprechiated.

Best,
Kalle

[gucio321]

After Terminating a window I get an error I don't understand when creating a new one.

Whats the error?

[0xkalle]

panic: ebiten: NewImage cannot be called after RunGame finishes

Which is triggert through the mentioned line:

result.bgColorMagic.pkgMask1x1 = ebiten.NewImage(1, 1) (ebiten_backend.go:80)

[gucio321]

could you show the whole bt

[0xkalle]

I'll but together minimal example real quick. Give me a second. :)

[gucio321]

summary

[after a chat on discord and a bit of research]

Ebiten does not (and will not) support running another instance after the first one (and only one) RunGame finishes. So calling any ebiten function (including NewImage) called after the first backend finishes (and the window is closed) will not work.