[Bug 28529] New: Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

Bug #: 28529
           Summary: Limbo game doesn't detect Shader Model 3.0, while card
                    supports it
           Product: Wine
           Version: 1.3.29
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

Created attachment 36616
  --> http://bugs.winehq.org/attachment.cgi?id=36616
log from running limbo.exe with wine

The game Limbo (http://limbogame.org) doesn't run, complaining about the
graphic card not supporting Shader Model 3.0. The card is GeForce 7300 GT,
according to NVIDIA it fully supports Shader 3.0. NVIDIA Drivers 275.21
installed.

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

[e-mail] changed:

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--- Comment #1 from [e-mail] 2012-02-19 12:30:50 CST ---
I met the same problem with Limbo on system with Intel graphics card.

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

gouriote  changed:

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                 CC|                            |[e-mail]

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

gouriote  changed:

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                 CC|[e-mail]       |

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

gouriote  changed:

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--- Comment #2 from gouriote  2012-05-23 12:32:44 CDT ---
I've done some search on this matter. Wine has error in shader support
detection. This bug is not presented in older versions, up to 1.3.22-138. You
need to revert this commit:
http://source.winehq.org/git/wine.git/commitdiff/c51db63ba4eda7e2cb565ebadf5...

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

gouriote  changed:

What    |Removed                     |Added
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                 CC|[e-mail]       |

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

Wylda  changed:

What    |Removed                     |Added
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           Keywords|                            |regression
             Status|UNCONFIRMED                 |NEW
                 CC|                            |[e-mail],
                   |                            |[e-mail]
            Version|1.3.29                      |1.3.23
     Ever Confirmed|0                           |1
    Regression SHA1|                            |c51db63ba4eda7e2cb565ebadf5
                   |                            |ede8fe6e1a9dd

--- Comment #3 from Wylda  2012-05-25 03:17:55 CDT ---

Confirmed several times. Updating some bug's fields...

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

Henri Verbeet  changed:

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             Status|NEW                         |RESOLVED
         Resolution|                            |UPSTREAM

--- Comment #4 from Henri Verbeet  2012-05-25 06:53:20 CDT ---
No, it's working as intended. ARB_shader_texture_lod is a requirement for SM3
support. If the driver doesn't support that while the hardware can do it, you
should probably file a feature request with NVIDIA. Note that the driver you're
using is fairly old though.

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

Wylda  changed:

What    |Removed                     |Added
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           Keywords|regression                  |
             Status|RESOLVED                    |CLOSED
    Regression SHA1|c51db63ba4eda7e2cb565ebadf5 |
                   |ede8fe6e1a9dd               |

--- Comment #5 from Wylda  2012-05-25 11:41:28 CDT ---

OK, thanks for explanation Henri. Closing.

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

gouriote  changed:

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--- Comment #6 from gouriote  2012-05-25 14:29:16 CDT ---
(In reply to comment #4)
Most NVIDIA cards doesn't support ARB_shader_texture_lod. Even most new. Even
with up-to-date drivers. And there is no standard demanding it to be the
requirement for shader model detection. So it is just working wrong. And opengl
does not follow Shader Model format. And it's not working as requirement,
because actually new Nvidia videocards are satisfying
gl_info->supported[EXT_GPU_SHADER4] condition, not ARB_shader_texture_lod. Even
7900gs is not passing this check. Only SM4 nvidia videocards could pass this
condition! I would so happy, if NV_vertex_program3 check were restored, so
nvidia 7 series cards shall be recognized by wine as SM3 compatible without
tricky manual patches.

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

Kirill  changed:

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--- Comment #7 from Kirill  2013-05-28 18:47:29 CDT ---
Please open this bug again. Comment #4 is wrong

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

--- Comment #8 from Kirill  2013-05-28 19:03:52 CDT ---
As said in Comment #6 GeForce 6/7 series cards do not support
ARB_shader_texture_lod, but they are SM3.0-compatible.
This bug is important because any game that use SM3.0 should be affected by
this bug

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

--- Comment #9 from Henri Verbeet  2013-05-29 02:13:13 CDT ---
(In reply to comment #8)
> As said in Comment #6 GeForce 6/7 series cards do not support
> ARB_shader_texture_lod, but they are SM3.0-compatible.

The hardware is, but the nvidia GL drivers don't expose the required
functionality. You need either ARB_shader_texture_lod, EXT_gpu_shader4 or GLSL
1.30 to implement the SM3 texldd and texldl instructions. The hardware clearly
can't support EXT_gpu_shader4 and GLSL 1.30, but it could do
ARB_shader_texture_lod if nvidia implemented it in their drivers.

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

--- Comment #10 from Kirill  2013-05-29 04:14:04 CDT ---
Thanks for fast answer!
Are you sure that SM3.0 that ARB_shader_texture_lod is required for supporting
SM3.0? For example, patching wine for disabling that commit
(http://source.winehq.org/git/wine.git/commitdiff/c51db63ba4eda7e2cb565ebadf5...)
gets running EVE Online with SM3.0

And I'm not sure that checking ARB_shader_texture_lod is the best method for
checking SM3.0
NVidia
(http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&am...)
recommends do it with NV_vertex_program3:

"In OpenGL, all you need to do is check for the presence of the
NV_vertex_program3 extension. If you are using the GLUT library, the
glutExtensionSupported function can perform that check. The number of
supported vertex texture images is queried as follows:
glGetIntegerv(MAX_VERTEX_TEXTURE_IMAGE_UNITS_ARB, &vtex_units);"

I don't know what functions are available in the NV_vertex_program3
(http://www.opengl.org/registry/specs/NV/vertex_program3.txt), but maybe better
will be giving Nvidia to correct their drivers? If we hide this driver error in
the Wine code, it will never be fixed.

(Sorry for my bad english)

[Bug 28529] Limbo game doesn't detect Shader Model 3.0, while card supports it

http://bugs.winehq.org/show_bug.cgi?id=28529

--- Comment #11 from Henri Verbeet  2013-05-29 05:07:56 CDT ---
(In reply to comment #10)
> Are you sure that SM3.0 that ARB_shader_texture_lod is required for supporting
> SM3.0? For example, patching wine for disabling that commit
> (http://source.winehq.org/git/wine.git/commitdiff/c51db63ba4eda7e2cb565ebadf5...)
> gets running EVE Online with SM3.0

Well, you can get lucky if the application doesn't actually use texldd or
texldl in fragment shaders. Many SM3 applications don't, but that doesn't mean
we can report the capability if the driver doesn't support it.
> And I'm not sure that checking ARB_shader_texture_lod is the best method for
> checking SM3.0
> NVidia
> (http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&am...)
> recommends do it with NV_vertex_program3:

That's for vertex shaders, the specific issue is with texldd and texldl in
fragment shaders. More importantly, that extension is for NVIDIA's proprietary
NV_vertex_program / NV_fragment_program extensions, it doesn't do anything for
GLSL shaders. That said, if the driver supports the NV_fragment_program2
extension, you should indeed get SM3 if you disable the GLSL shader backend and
use the ARB program shader backend instead. Note that that configuration is
mostly unsupported though.

Something else to consider may be using the Nouveau drivers instead. I'm not
entirely sure what level of support it has for GF6/7 hardware at this point,
but there's a decent chance it either already supports ARB_shader_texture_lod,
or could be made to relatively easily.