[BUG]: Texture flickering in background in Rayman 3 Hoodlum Havoc

[JordanTheToaster]

Describe the Bug

During the opening stages of Rayman 3 as you come out to an overview you can observe the background flickering as you move or if you sit in the correct spot you can see black squares or chunks missing.

Reproduction Steps

Load the provided GS dump and observe the flickering in the background as rayman moves.

Expected Behavior

The background to not flicker.

PCSX2 Revision

v1.7.2755

Operating System

Windows 10 (64bit)

If Linux - Specify Distro

No response

CPU

Ryzen 5 5600x

GPU

RTX 2060 Super

GS Settings

Vulkan Full (Hash Cache) preloading native internal res.

Emulation Settings

No response

GS Window Screenshots

No response

Logs & Dumps

https://drive.google.com/file/d/1BX3pZwX_3RZ0tDpPMzYl5cOL7TEyJOhB/view

[coornio]

Here's a savestate on 1.7.2755 for anyone interested. No hack or round/clamp mode fixes this issue, which I think was present since many, many years ago. I suspect Z-fighting, in which case that PR about doubles for Z in software may be of help?

SLUS-20601 (146F67E5).00.zip

[lightningterror]

in which case that PR about doubles for Z in software may be of help?

Can you give it a go?

[dio-gh]

Was tested yesterday on Discord, doesn't affect this specific issue.

[refractionpcsx2]

New dump link Rayman3.zip

[refractionpcsx2]

Also reproduced on real hardware, but leaving open for our HW mode which is just jacked.

[refractionpcsx2]

Well the problem is Z depth accuracy, and it's lacking Z accuracy in the HW renderer more than the PS2 and SW mode do, so that needs to be delt with at some point, but SW mode is PS2 accurate.