libretro / libretro/RetroArch

GL/Mupen64 broken scaling on Xbox

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Dominant language
C
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Description

When trying to use the Muphen64 core the scaling becomes far too large. The only visible portion of the screen is the bottom left quadrant. This occurs on a fresh install on a Xbox series S. The bug seems to be related to using the gl video driver, as when I switch to using the rdp plugin angrylion and then changing the video driver to d3d the correct scaling returns. I went back and checked and this issue was not present in version 1.11.0, but from version 1.11.1 till current (1.12.0) the bug manifests. This is my first time raising an issue, so I hope this explanation was detailed enough to reproduce!

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the scaling issue on an Xbox Series S with the Mupen64 core and the GL video driver, then compare it with angrylion/RDP using D3D. Compare behavior between RetroArch 1.11.0 and 1.11.1 or later; done means GL scaling matches the expected full-screen output without regressing the working configuration.

Written by the indexing model from the issue text.

Assessment

Tech stack
c
Domain
computer-graphics
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
38/100

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