TASEmulators / TASEmulators/BizHawk
[Neshawk] Graphical glitches at Uchuu Keibitai SDF's intro cutscene
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- Dominant language
- C#
- Stars
- 2.8k
- Forks
- 468
- PR merge metrics
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Description
If you wait a bit at Uchuu Keibitai SDF's title screen, a cutscene showing your ship's stats will appear. It uses a split screen effect, which isn't emulated correctly in Neshawk. This is how it looks like there:
FCEUX in old PPU mode emulates it correctly (new PPU is also wrong). This is how it's supposed to look like:
That matches how things look on real hardware (I verified). Other emulators that also emulate it correctly are Nestopia UE and puNES. One thing worth mentioning is that surprisingly enough, it's also partially glitched in Mesen.
I'm guessing this is a result of bad MMC5 emulation, which is the mapper used by the game.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce Uchuu Keibitai SDF's intro cutscene in Neshawk and compare the split-screen output with the provided real-hardware and emulator videos. Start by tracing Neshawk's MMC5 and PPU emulation paths; done means the ship-stats cutscene renders like the reference, including the split-screen effect.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- csharp
- Domain
- computer-graphics
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100