[Flickering and graphical glitches] Advance wars 1 and 2

[cjlaborde]

Here is another problem

Not sure if this is the exact same issue, but I ran into this with Advance Wars 2 dialogue. The issue persists whether or not I have interframe blending or sync to video enabled (in the gif both are enabled).

I have same issue with advanced wars

I am using Retoarch with MGBA on linux.
Issue seems to be happening more often when there is Dialog text at the top of the screen.

@tnelling Seems to have same issue.

[endrift]

Retroarch huh. I believe they're currently basing off of mGBA 0.8.2.

[cjlaborde]

Here are my specs

[tnelling]

When I encountered the issue, I was running mGBA 0.8.1 on Windows 10.

[cjlaborde]

I am using VBA-M now and doesn't have this issue.
Seems VBA had issues with Advance Wars 2 in the Past but they fixed it as in mentioned in the screenshot below.
https://emulation.gametechwiki.com/index.php/Game_Boy_Advance_emulators

The good news is you can use mGBA save file on VBA-M so you can use both with no problem.

[endrift]

It doesn't actually mention what issues it had though. (Also it's VBA, not VGA.)

[endrift]

Regressed in 223be49. That means you can use a real BIOS to temporarily work around the issue. The bug appears to be related to how long it takes for division to occur. That commit made it so that division in mGBA takes non-zero time in the HLE BIOS. In the regular BIOS, division is an interruptable process, but in the HLE BIOS it's not, so since it now takes non-zero time that can push some things back to happening too late. This may be a tricky one to solve without using a proper BIOS.

[endrift]

It doesn't look like I'll be able to fix this in 0.8.3 (or 0.8.x at all), so I'm retargeting it for 0.9.0 (as a blocker)