Silent Hill 2 missing polygons in software mode

[LordArchantos]

PCSX2 version:
v1.5.0-dev-2673-g15733ed8c

PCSX2 options:
Tried with defaults as well as every possible round / clamp mode combinations, with and without speedhacks, attempted all gamefixes one at a time as well.

Plugins used:
GSdx, each renderer. Issue exists with each in software mode, but not in hardware.

Description of the issue:
Some polygons in some places are missing. Right in the beginning, visible also in the beginning cutscene on the left side of the screen, there is a urinal with polygons missing in software mode. Maybe related to a similar issue in Silent Hill 3 ( #1562 (comment) )?

How to reproduce the issue:
Start a new game and watch the beginning cutscene (after the initial FMV) in software mode, keeping an eye on the left side of the screen. Issue is also visible right after the cutscene ends by walking straight left to the next screen; the urinal is on the left side of the screen close to the camera, and in software mode you can only see thin "lines" of the edges of the urinal.

PC specifications:
CPU: Intel i5-7600K GPU: MSI GTX 1060 3GB OS: Windows 10 64 Bit

[MrCK1]

This is already patched out I believe, can you post the emulog please.

[LordArchantos]

Here ya go.
emuLog.txt

[lightningterror]

Hmm hardware mode is fine but on debug mode I'm triggering

pcsx2/plugins/GSdx/Renderers/OpenGL/GSRendererOGL.cpp

Line 203 in 2e1db41

ASSERT(m_vt.m_min.p.z > max_z); // sfex capcom logo

I wonder if it's related.

[MrCK1]

Alot of games trigger that, it might just be normal.

[gregory38]

No it isn't normal. It means invalid depth for the GS.

It could explain the SW renderer issue. SW really emulate the GS memory. So if you have a 16 bits depth, you can't use/write value bigger than 0xFFFF. HW renderer is backed with a float depth buffer, so you could write any value.

Depth issue might drop some polygons

[Krusher97]

https://gfycat.com/NippyInformalAcaciarat

Video of the issue

[lightningterror]

Fixed in #3433