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[BUG]: Grandia III [SLUS-21334] - Shadows z-fighting, rounding issue

Open trostboot opened this issue 2 years ago • 2 comments

Describe the Bug

In Sabatar Harbor, static shadow textures in a specific area appear to be suffering from z-fighting issues. Seemingly not a GS issue (and is accordingly present across all renderers), is fixed by EE rounding mode set to either Nearest or Negative.

Verified to not be an issue on real hardware.

I likely won't be able to play through large stretches of the game with one or both of these to see if any issues arise from changing it, so I don't feel comfortable making a call for changing either one of these options in the GameDB.

Reproduction Steps

Walk towards the harbor area in Sabatar Harbor, observe shadows around the wooden crates.

Expected Behavior

Stable, non-flickery shadows.

PCSX2 Revision

v1.7.4506

Operating System

Windows 11

If Linux - Specify Distro

No response

CPU

Ryzen R9 3900X

GPU

GTX1080

GS Settings

No response

Emulation Settings

No response

GS Window Screenshots

Grandia III Disc 1 of 2 _SLUS-21334_20230513232500

Logs & Dumps

GSDump (for illustration purposes only, rounding changes will not affect the dump) Memory Card (Leave building and walk towards the harbor area) Savestate

trostboot avatar May 13 '23 22:05 trostboot

dose the z-fighting issues happen on SW without the ee change ?

Mrlinkwii avatar May 13 '23 22:05 Mrlinkwii

Yes. As I mentioned, it is present across all renderers.

trostboot avatar May 13 '23 22:05 trostboot