[Bug 50135] New: Unigine Heaven black stripes and weird shaders

[Bug 50135] New: Unigine Heaven black stripes and weird shaders

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https://bugs.freedesktop.org/show_bug.cgi?id=50135

             Bug #: 50135
           Summary: Unigine Heaven black stripes and weird shaders
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Drivers/Gallium/r600
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: kam1kaz3@gmail.com


Created attachment 61868
  --> https://bugs.freedesktop.org/attachment.cgi?id=61868
day time rendered image 1

Black stripes appear across geometry, which appears to be wrongly computed
shadows, but I'm not sure (see day_* attachments). And some weird rendering
happens when night time is rendered (see night_* attachments)

System:
OS: Arch Linux
Kernel: 3.4 RC7
OpenGL renderer string: Gallium 0.4 on AMD RV670
OpenGL version string: 2.1 Mesa 8.1-devel (git-27b821b)
OpenGL shading language version string: 1.30

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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https://bugs.freedesktop.org/show_bug.cgi?id=50135

--- Comment #1 from Micael Dias <kam1kaz3@gmail.com> 2012-05-19 21:17:36 UTC ---
Created attachment 61869
  --> https://bugs.freedesktop.org/attachment.cgi?id=61869
day time rendered image 2

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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--- Comment #3 from Micael Dias <kam1kaz3@gmail.com> 2012-05-19 21:19:55 UTC ---
Created attachment 61871
  --> https://bugs.freedesktop.org/attachment.cgi?id=61871
night time rendered image 2

A bunch of errors also appear on the console when the app starts rendering
night time.
Error sample:

GLShader::loadFragment(): error in
"core/shaders/default/mesh/fragment_base_light_omni.shader" file
defines:
UNKNOWN,QUALITY_LOW,QUALITY_MEDIUM,MULTISAMPLE_0,USE_INSTANCING,USE_TEXTURE_3D,USE_TEXTURE_ARRAY,USE_ALPHA_FADE,USE_REFLECTION,USE_DEFERRED,USE_PARALLAX,HAS_DEFERRED_COLOR,HAS_DEFERRED_NORMAL,HAS_DEFERRED_PARALLAX,USE_PHONG_RIM,USE_ENVIRONMENT,USE_NORMALIZATION,USE_DIRECTIONAL_LIGHTMAPS,USE_SCATTERING_FALLOFF,USE_SHADOW_KERNEL,OPENGL,USE_PSEUDO_INSTANCING,USE_PSEUDO_TRANSFORM,USE_ARB_BLEND_FUNC_EXTENDED,HAS_ARB_DRAW_INSTANCED,BASE_LIGHT_OMNI,OMNI,SHADOW,PHONG_RIM,OVERLAY_0
0:629(18): error: syntax error, unexpected NEW_IDENTIFIER

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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https://bugs.freedesktop.org/show_bug.cgi?id=50135

--- Comment #2 from Micael Dias <kam1kaz3@gmail.com> 2012-05-19 21:18:04 PDT ---
Created attachment 61870
  --> https://bugs.freedesktop.org/attachment.cgi?id=61870
night time rendered image 1

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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https://bugs.freedesktop.org/show_bug.cgi?id=50135

--- Comment #4 from Vadim Girlin <ptpzz@yandex.ru> 2012-05-19 23:28:13 PDT ---
Created attachment 61874
  --> https://bugs.freedesktop.org/attachment.cgi?id=61874
[PATCH] st/mesa: expose "force_glsl_extensions_warn" option

I think attached patch might help. It allows to use less strict extension
handling to workaround some unigine problems. You'll also need to set
"force_glsl_extensions_warn" environment variable to "1" or "true" before
running the app:

force_glsl_extensions_warn=1 ./heaven

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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--- Comment #5 from hadack@gmx.de 2012-05-20 06:02:40 PDT ---
I see this too on a similar setup:
Slackware-current
kernel 3.4-rc7

OpenGL renderer string: Gallium 0.4 on AMD RV670
OpenGL version string: 2.1 Mesa 8.1-devel
OpenGL shading language version string: 1.30

The patch from Vadim fixes the night-time scenes and the errors are away, but
not the wrong rendering of the shadows.
I have the same wrong shadows in HoN too, disabling shadows fixes this.

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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--- Comment #6 from Micael Dias <kam1kaz3@gmail.com> 2012-05-20 17:08:50 PDT ---
I confirm that the patch doesn't help with the daylight scenes. They look the
same.

It helped with night time scenes, just like the previous comment says.

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--- Comment #7 from Andreas Boll <andreas.boll.dev@gmail.com> 2012-09-10 12:12:44 UTC ---
(In reply to comment #6)
> I confirm that the patch doesn't help with the daylight scenes. They look the
> same.
> 
> It helped with night time scenes, just like the previous comment says.

The night time scenes should be fixed with the fixes from Bug 43477 .
You can test the fixes with current mesa git master or with the 9.0 branch.

What's up with the day time issue?
I can't reproduce this issue on my system:

Kernel 3.4
OpenGL renderer string: Gallium 0.4 on AMD RV770
OpenGL version string: 2.1 Mesa 9.1-devel (git-e81ee67)
OpenGL shading language version string: 1.30

Additionally I'm using MESA_EXTENSION_OVERRIDE="-GL_ARB_shader_bit_encoding"
as workaround for Bug 53118 .

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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--- Comment #8 from Micael Dias <kam1kaz3@gmail.com> 2012-09-10 12:44:16 UTC ---
Created attachment 66925
  --> https://bugs.freedesktop.org/attachment.cgi?id=66925
OgreSampleBrowser - Shadows

Appears to be related.

I'd say it looks like a depth precision/bias issue, but I'm not sure.

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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https://bugs.freedesktop.org/show_bug.cgi?id=50135

--- Comment #9 from Simone Scanzoni <nonno.cicala@tiscali.it> ---
I still have this problem with Mesa 9.2-devel (git-4deefd9)
( patched with:
 r600g: emit a ps partial flush after CP DMA
 r600g: enable CP DMA on r6xx (v3) )
The night times scenes work better with force_glsl_extensions_warn=true

I saw this problem with Unigine Heaven 3.0, Heroes of Newerth 3.0.3 (also 2.x)
and Xonotic 0.6.0 .

I think the last one is interesting because it is under GPL and works fine if I
just enable shadows from realtime world lights but shows the problem if I
enable "Soft shadows" too. The tooltip of "Soft shadows" is:
[enables use of shadowmapping (depth texture sampling) instead of stencil
shadow volumes, requires gl_fbo 1]
The problem in Xonotic can be seen only in a few places with dynamic world
lightning, like some rooms with lava in level 6 and the lights behind some big
fans in level 8.

HD3850 (RV670) AGP, kernel 3.8.0

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[Bug 50135] Unigine Heaven black stripes and weird shaders

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https://bugs.freedesktop.org/show_bug.cgi?id=50135

--- Comment #10 from Simone Scanzoni <nonno.cicala@tiscali.it> ---
Created attachment 80226
  --> https://bugs.freedesktop.org/attachment.cgi?id=80226&action=edit
Xonotic with shadow mapping

Bug still present today in Mesa 9.2.0 (git-c754f7a), kernel 3.9.4.

I saw a similar glitch also in Brütal Legend, Stacking and Costume Quest,
especially with ambient occlusion, so I suppose all the games using the Buddha
engine from Double Fine are affected.


I think the bug title should be changed for the following reasons:

The black stripes problem isn't specific to Unigine but happens with at least 4
different engines: Unigine, Buddha, DarkPlaces and K2.

The 3 people who see the bug here all use an RV670.

There is a workaround for the wrong shaders in the night time scenes.

The black stripes problem seems related to shadows, because disabling them in
Xonotic and Heroes of Newerth removes the stripes and disabling ambient
occlusion in games using the Buddha engine reduces the stripes slightly.


So I propose to change the title to: Broken shadows on RV670

I'm not sure if it's just a problem with shadow mapping because even if using
stencil shadow volumes works in Xonotic the screenshot posted by Micael of the
OgreSampleBrowser exhibit a similar problem and the text: "Technique Stencil".


Could the output of any R600_DEBUG setting be useful?


Attached a screenshot of the bug in Xonotic.

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--- Comment #11 from Simone Scanzoni <nonno.cicala@tiscali.it> ---
Created attachment 80228
  --> https://bugs.freedesktop.org/attachment.cgi?id=80228&action=edit
Xonotic with shadow mapping, sharp flavour

The black stripes in Xonotic can be soft or sharp.

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--- Comment #12 from Simone Scanzoni <nonno.cicala@tiscali.it> ---
Created attachment 80229
  --> https://bugs.freedesktop.org/attachment.cgi?id=80229&action=edit
Xonotic with stencil shadow volumes

Stencil shadow volumes work in Xonotic, so you can see how the shadows should
be.

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--- Comment #13 from Simone Scanzoni <nonno.cicala@tiscali.it> ---
Created attachment 80230
  --> https://bugs.freedesktop.org/attachment.cgi?id=80230&action=edit
Xonotic without shadows from realtime world lights

Comparing this to the screenshot with stencil shadow volumes you can see which
shadows are affected.

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--- Comment #14 from Michel Dänzer <michel@daenzer.net> ---
Is this still an issue with current Mesa?

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--- Comment #15 from Micael Dias <kam1kaz3@gmail.com> ---
(In reply to comment #14)
> Is this still an issue with current Mesa?

I no longer have access to the hardware, so I cannot confirm.

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--- Comment #16 from Alicia <britbaby22@gmail.com> ---
First off, please bear with me if I make some noobish mistakes. I just recently
switched to Linux, and this is my first actual report I've made on a bug. This
is also my first venture into the depths of the actual GPU hardware.

I have a Radeon HD3650 (RV635, non-mobility) card, and I can verify that the
shadow stripes are still present. I don't play HoN, but I am playing the new S2
game, Strife, which uses the same engine. Setting shadows to lowest possible
does accomplish the same as Off in HoN as mentioned above.

I'd like to point out that the stripes actually change in size depending on the
variability of the setting. Medium shadows have about a 50/50 split of the dark
stripe compared to the light stripe. High has mostly full shadows with a very
little bit on the lighter stripe.

One last thing, and probably unrelated, but my card also seems to have problems
with some transparent shaders, as well. In Strife, it's visible in the launcher
quite easily.
http://i.imgur.com/17vq5In.jpg
This is with Shaders on Low. Higher settings result in worse corruption for
this. The blue and green boxes seem to change depending on which part they're
in. Green for the lightshaft/fog that runs across the center, as well as the
gem glow in the top-left. Cyan/blue for the background lighting.

For the record, both of these problems render fine in software mode.

I'm using Xubuntu 14.04, with the obiaf ppa, if it helps, though I can say this
issue is present in every version I've tried, including the default drivers on
the original 14.04 disc, as well as some of the stuff I managed to get working
from 13.10. Therefore, I can assume they're both not regressions, but just
missing or otherwise not-fully-working implementations.

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--- Comment #17 from Alicia <britbaby22@gmail.com> ---
Just searching around, and found this:
https://bugs.freedesktop.org/show_bug.cgi?id=37296
Seems like this bug is similar, and possibly the same problem.

Oh, and before I forget, if anyone needs more info, or wants me to test
something, I'm more than willing to help. However, in terms of applying/testing
patches, I'd need some guidance since I've never done that before, so probably
a how-to or whatever will be needed.

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

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

--- Comment #18 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/410.

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