VIF MODE register test - Githubissues

unknownbrackets / ps2autotests

A set of test programs run on a PS2, with accompanying results.

ISC License

25 stars 7 forks source link

VIF MODE register test #26

Closed jpd002 closed 8 years ago

jpd002 commented 8 years ago

This is a test that shows the way the MODE register affects the UNPACK process.

Every mode is tested with masking on and off to see how the behavior changes.

Mode 3 is not documented, but I figured I would leave it there since it does give an interesting and stable result which might need to be studied later on.

I've also included a commit that cleans some of the includes that are used in the mskpath3 test.

unknownbrackets commented 8 years ago

The behavior of mode 3 is interesting. Cool.

-[Unknown]

jpd002 commented 8 years ago

Yeah, but not quite sure I understand how mode 3 works though. Let's hope it's not used by a game...

unknownbrackets commented 8 years ago

It might be useful to spit out 5, not just 4 rows. But from the output, my guess is:

Each row updates the row register after write.
If masked, the row register is written to memory, and no update is made to the row register for that column.

It seems like a fairly consistent function, maybe. Does Play! use any sort of reporting system to collect things like that while users play game? In PPSSPP, it's opt-in, but it's helped a lot.

-[Unknown]