Incorrect window behaviors with Software mode

[AlanDrake]

Describe the bug
The SDL2 renderer has two issues that I don't recall being there when using true fullscreen:

• the game screen remains on top after alt tabbing out
• it often fails to resize the window when switching to windowed mode, keeping full screen size and drawing the game on the top left corner

Not sure if it's due to SDL

AGS Version
AGS 3 and 4 (latest)

To Reproduce
Steps to reproduce the behavior:

1. Set software renderer and disable borderless fulscreen
2. launch game
3. alt-tab to see first issue
4. alt-enter to see second issue

Expected behavior
Should work just like it does for D3D and OGL.

Desktop:

• OS: Windows 10

[ivan-mogilko]

This reminds me of the bug report that I opened in SDL2 repo:
libsdl-org/SDL#7838

Idk if it's same case, but the symptoms are very similar.

That problem only occured if SDL created "direct3d" renderer. This may be controlled by writing "software_driver" in config, as explained in readme: https://github.com/adventuregamestudio/ags/blob/master/OPTIONS.md#configuration-file-options

[AlanDrake]

Interesting, if I force software_driver=direct3d it works fine, but if remove it then it's back to working incorrectly.
And to make it more weird, the logs from one case to the other are identical (both report Created SDL Renderer: direct3d).

What could possibly change when "software_driver" is manually set to "direct3d" vs default?

[ivan-mogilko]

And to make it more weird, the logs from one case to the other are identical (both report Created SDL Renderer: direct3d).
What could possibly change when "software_driver" is manually set to "direct3d" vs default?

That's what i mentioned in the linked ticket: when renderer is undefined, then SDL creates one in a "batching" mode, but if it's requested explicitly, then the batching mode is disabled (unless requested explicitly too).

[AlanDrake]

I see, a SDL2 quirk then.

[ivan-mogilko]

Hmm, since I started to have this behavior too, I guess this might be happening on multi-monitor systems.