Ratchet & Clank - Light bleeding through walls

[LasagnaPie]

PPSSPP v0.9.8-695-g8c11559
Windows 7 x64
Buffered Rendering

[unknownbrackets]

Is this with hardware transform on, off, or both?

https://github.com/hrydgard/ppsspp/wiki/How-to-find-a-graphic-issue-with-the-GE-debugger

-[Unknown]

[LasagnaPie]

yes, both hardware transform

[thedax]

I wouldn't be surprised if it's a depth issue, we still have multiple games with depth issues.

[unknownbrackets]

Did it ever work in a previous version? If yes, what's the first build that stopped working, and the last build that did work?

Yes, definitely could be depth. Not clear on how it's drawing those lights...

-[Unknown]

[ClubIce]

this is a depth issue (?)

[unknownbrackets]

Well, that does look like a testing issue of some sort.

-[Unknown]

[ClubIce]

game looks fine in lastest builds.

[LasagnaPie]

Things still bleed through the walls like sprites and the waterfall in the first level

[ppmeis]

Tested with latest build. Same issues:

[DerekTurtleRoe]

I have the same issue as well on both v1.1.1 and the latest Git build. Here is a screenshot:

[unknownbrackets]

Yes, we know this is still an issue.

So far, depth is just a guess. I don't have the game, but what probably needs to happen is someone needs to walk through a frame, and see what it's drawing. For example, does it do anything with depth that looks interesting before drawing the lights? Does it seem like the lights ought not be drawn?

Also, it could be worthwhile to set a breakpoint where it has its depth buffer, to see if it's manually clearing it to some value or something at some point.

Want to give it a shot?

-[Unknown]

[DerekTurtleRoe]

@unknownbrackets Sure, I am somewhat unfamiliar with PPSSPP's debugging features because I haven't run into any issues besides this, but I will do my best.

Is there a good place to start?

[unknownbrackets]

The GE debugger really really really helps. It's Windows only, so if you're not on Windows, I suggest WINE. It works pretty well per my last test, although it helps a lot to have Windows fonts. The first thing I usually do is click "step tex" to get a mindset for how the game is rendering the frame, and at what point it draws the problem thing.

So, I would look to see when it draws these things, what under the "Flags" tab it's using to draw. Many of these are tests - depth test, alpha test, etc. Note that @LasagnaPie's screenshot above implies that it's rendering these things to a temporary buffer - so how it initializes / clears this temporary buffer is likely important too.

Then look to see where it's rendering this temporary buffer (if my assumption is correct) to the screen. This may also use tests, such as alpha, stencil, or etc.

It's likely that one of these tests should be preventing the thing from drawing. You can double click a test to disable it, and under "Settings" you can change the test parameters.

There are a lot of areas where things get complicated (stencil and alpha are the same bits on a PSP, for example.) I think if we first establish what it's even trying to do, we'll be in a good starting place.

-[Unknown]