Kidou Keisatsu Patlabor - Kamubakku MiniPato another screen problem

[sum2012]

Game or games this happens in

ULJS00026

What area of the game

Game issue history: #16992
In-game

What happens

What should happen

This is softgpu

GE frame capture

ULJS00026-BAD2.zip

Platform

Windows

Mobile phone model or graphics card

Nvidia Geforce 710

PPSSPP version affected

v1.14.4-736-gebd8a6391

Last working version

#16992 (comment)

Graphics backend (3D API)

Vulkan

Checklist

• Test in the latest git build in case it's already fixed.
• Search for other reports of the same issue.
• Try resetting settings or older versions and include if the issue is related.
• Try changing graphics settings to determine if one causes the glitch (especially speed hacks or enhancements/replacements.)
• Include logs or screenshots of issue.

[hrydgard]

This still happens. Checked the dump with renderdoc and the vertex data of the "missing" draw call is full of NaNs after the vertex shader. The other draws look normal.

This is very odd because the position data is the same, and the matrices are also the same, except a small tweak to pos. The only other change in the UBOs is small tweaks to u_depthRange and u_cullRangeMin/Max. Really struggling to see what could cause NaNs here... Well, I suppose we might be triggering the range culling. Does seem to be the case.

Same thing happens in OpenGL and D3D11. D3D9 fails entirely but meh.

[sum2012]

v1.16.6-333-gecab50346 still happens

[hrydgard]

Tiny adjustments to the range Z culling range makes the GE dump work, so I think this is a precision issue where our culling limits are just a smidge too tight. This single change is enough (on Vulkan): maxValues[2] = z.second + 1.0f/65536.0f; in ShaderUniforms.cpp.

[hrydgard]

This can now be worked around with the new setting. Pushing forward to the next version, since any change to the culling will need a lot of testing.

[sum2012]

Do I need open another issue for Nvidia gpu ? ( No color for police)
EDIT: Only error in D3D11 and Vulkan

Test on AMD cpu 7900 of internal gpu no problem

[sum2012]

What mean "Disable culling" ?
I want try to translate

[hrydgard]

I guess "Triangle removal outside of bounds" or something would be more accurate, but actually explaining the setting doesn't fit in a line...

The PSP will remove triangles that have corners that are either outside an X/Y range of 0..4096x0..4096 (offset by the offset register), or outside a Z range of 0 to 1. Some games rely on this. We still have some very small inaccuracies in both mechanisms, so we now have a setting to turn this behavior off.

If you have a better idea for a name for the setting let me know! :)

[hrydgard]

I'll do this minor adjustment right after the 1.18 release.