Running from another go routine (systray)? glfw: DestroyWindow failed: Access is denied.

[phrozen]

I am doing something similar to the mascot example in the repo, but I want to be able to control the ebiten app window (create and destroy cycles) with a systray icon app. I can create everything in the goroutine just fine, but when closing the window (by returning an error on the Update() call) I get a log with glfw: DestroyWindow failed: Access is denied.. This prevents me from creating everything again to "re launch" the ebiten app from scratch, program immediately panics with: panic: ui: u.window must not exist at createWindow.

I tried using runtime.LockOSThread() to no avail. Is there any workaround for this? Is it possible to create and destroy the whole app from within a goroutine?

[hajimehoshi]

There is a restriction that RunGame must be called from the main goroutine: https://pkg.go.dev/github.com/hajimehoshi/ebiten/v2#RunGame Were you trying to call this from different goroutines?

[phrozen]

As a side note on CPU usage, minimizing does nothing to it, and lowering the TPS to things like 5 still has the same CPU usage (while affecting the dragging animation). Tracking the time in Draw() to only redraw every 500ms does nothing to CPU usage as well. I have tried optimizing everything I can think off, but is still around 8% consistently with some spikes up to 12%. The app only loads a font, calculates the size of the window, and just draws the text, nothing more, which is why I believe usage is quite high for that basic example.

[hajimehoshi]

Probably I'd use multiple processes as one Ebitengine process can treat one window.

For CPU usages, you might be able to mitigate it by using ebiten.SetScreenClearedEveryFrame(false) and update the screen only when necesasry. Even with this, Ebitengine applications tend to use relatively high CPU usages.

[phrozen]

Thanks! I will give that one a try and check if it helps. I'll have everything up in the a repo soon. I can ask again later with concrete code examples. Is there a Discord or some other community to reach you? Or is this the preferred method?

[hajimehoshi]

Is there a Discord or some other community to reach you? Or is this the preferred method?

Here you are :) https://discord.gg/3tVdM5H8cC

[phrozen]

Lovely! That last thing (using ebiten.SetScreenClearedEveryFrame(false)) and keeping track of last rendered time to only update every 500ms+ brought it down to around 2%, which I guess is way more acceptable (75% CPU usage reduction), will keep optimizing and see where else I can gain a few things. Closing this now.