[Bug 108340] Ambient Occlusion in Two Point Hospital shows black spot artifacts

[Bug 108340] Ambient Occlusion in Two Point Hospital shows black spot artifacts

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https://bugs.freedesktop.org/show_bug.cgi?id=108340

            Bug ID: 108340
           Summary: Ambient Occlusion in Two Point Hospital shows black
                    spot artifacts
           Product: Mesa
           Version: 18.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: christos.kotsaris@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Two point hospital works pretty well on my Archlinux system using Mesa 18.2.2,
LLVM 7.0, kernel 4.18.12 with max graphical settings. The only setting that has
an issue is Ambient Occlusion. With that enabled, when you move the camera
around it produces a lot of black spots around the edges of walls and items.
With that setting disabled everything displays fine. 

>From what little search i did, i saw other people reporting this issue on the
steam forums of the game but it is not reported here and i think it is an issue
with Mesa. For the record i am using an R9 380 card and i saw people reporting
the same problem on Polaris cards.

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[Bug 108340] Ambient Occlusion in Two Point Hospital shows black spot artifacts

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https://bugs.freedesktop.org/show_bug.cgi?id=108340

Timothy Arceri <t_arceri@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #1 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Getting an apitrace [1] of the problem would be useful.

[1] https://github.com/apitrace/apitrace/wiki/Steam

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[Bug 108340] Ambient Occlusion in Two Point Hospital shows black spot artifacts

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https://bugs.freedesktop.org/show_bug.cgi?id=108340

--- Comment #2 from wietse.jorissen@gmail.com ---
I am noticing the same issue, also running on max graphical settings.

Ubuntu 18.10
Kernel 4.18.0-13-generic
AMD RX 480
OpenGL version string: 4.4 (Compatibility Profile) Mesa 18.2.2

Steps followed:
1. Installed apitrace (sudo apt-get install apitrace)
2. Looked up the ID of Two Point Hospital (535930)
3. Ran the following command in terminal (DEBUGGER="apitrace trace" steam
steam://rungameid/535930)
4. Once ingame with the Ambient Occlusion option active, I zoomed in and out
and moved the camera around as this seems to exacerbate the black spots.
5. The trace file is stored next to the game executable
(/home/username/.local/share/Steam/steamapps/common/TPH/TPH.x86_64.trace)

6. I compressed the trace file with 7z

https://mega.nz/#!y3IzRY6A!ksUZcYGjgeHnBk9XtZb3J7pnIb5meZV8TxB-T27XmPs
The file is hosted on MEGA, and I used 7z compression to make the uploaded file
somewhat smaller.

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[Bug 108340] Ambient Occlusion in Two Point Hospital shows black spot artifacts

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https://bugs.freedesktop.org/show_bug.cgi?id=108340

--- Comment #3 from wietse.jorissen@gmail.com ---
Created attachment 142915
  --> https://bugs.freedesktop.org/attachment.cgi?id=142915&action=edit
Recurring error in trace file replay in qapitrace

I've now installed qapitrace (sudo apt-get install apitrace-gui) and can now
look into what errors are being listed after I replay the trace therein. 

Then I tried delving deeper into the error messages and think I may have at
least found something relevant. But I'm quite out of my element here.

In the attached screenshot, you can see it lists 4 errors regarding "array
index must be a scalar". These errors seem to refer to a glShaderSource call
for a GL_FRAGMENT_SHADER, shader string 0, at lines 65,98,99 and 100.

What these four lines have in common is that they all use the same value to
address a certain index in an array: 

ivec4(u_xlati12)

For line 65 it's unity_Builtins0Array and for 98,99 and 100 it's
unity_Builtins0Array.

So now the question is, what is the value of ivec4(u_xlati12) and what
generates it, to find out what is causing it.

The error is repeated quite often, and it's always that index.

The fact that I can also see variables named _OcclusionStrength and
_OcclusionMap at least makes me think I'm looking in the right direction.

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[Bug 108340] Ambient Occlusion in Two Point Hospital shows black spot artifacts

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https://bugs.freedesktop.org/show_bug.cgi?id=108340

--- Comment #4 from Thomas R. <freedesktop-bugs@digital-trauma.de> ---
Parkitect has the same issue, it seems to be a general Unity thing.

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[Bug 108340] Ambient Occlusion in Two Point Hospital shows black spot artifacts

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https://bugs.freedesktop.org/show_bug.cgi?id=108340

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |MOVED

--- Comment #5 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1336.

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