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Disabling super game boy border makes window show garbage pixels. #1898

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Lokathor opened this issue Sep 27, 2020 · 2 comments
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Disabling super game boy border makes window show garbage pixels. #1898

Lokathor opened this issue Sep 27, 2020 · 2 comments
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mGBA 0.9.0

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@Lokathor
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  • Version: 0.9-6424-4a28264d
  • Git Hash: master 4a28264

With a game boy game running and the Super Game Boy border displayed, if you turn off the super game boy border in the settings then the window displays garbage pixels.

  • It happens reliably, and with more than just one game (tried Pokemon Red and also Donkey Kong)
  • It doesn't happen with games that don't have a super game boy border (tried Dragon Warrior 1+2)
  • If you take a screenshot using mGBA itself the screenshot produced shows the proper output.
@Lokathor
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Lokathor commented Sep 27, 2020 •
edited

Meanwhile, this is what you actually see ("showing" the pokemon red title screen):
PXL_20200927_002211550

@endrift endrift added this to the mGBA 0.9.0 milestone Oct 1, 2020
@endrift
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endrift commented Oct 7, 2020 •
edited

This appears to be because the GL backend gets confused about the stride when the resolution changes. GL thinks the stride is equal to the width, whereas the core has no such illusions. It's most likely a regression, since I don't remember that issue always existing, especially when I added disabling in the first place.

endrift added a commit that referenced this issue Oct 15, 2020
@endrift
Qt: Fix stride changing when toggling SGB borders (fixes #1898)
e7f76e6
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