[Bug 35144] New: r300g should advertise GL_ARB_half_float_vertex on rv350

[Bug 35144] New: r300g should advertise GL_ARB_half_float_vertex on rv350

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35144

           Summary: r300g should advertise GL_ARB_half_float_vertex on
                    rv350
           Product: Mesa
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r300
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: aaalmosss@gmail.com


Created an attachment (id=44273)
 View: https://bugs.freedesktop.org/attachment.cgi?id=44273
 Review: https://bugs.freedesktop.org/review?bug=35144&attachment=44273

halffloat.diff

The windows driver does advertise this extension. As the attached patch shows,
the comment in the code already says it should be supported, but the chip
revision check is incomplete.

I couldn't test the patch, as the only program actually using this extension
that I know of is unigine, but it also needs GL_EXT_texture_swizzle (which is
supported by the windows driver).

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[Bug 35144] r300g should advertise GL_ARB_half_float_vertex on rv350

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35144

--- Comment #1 from Marek Olšák <maraeo@gmail.com> 2011-03-09 07:11:42 PST ---
rv350 really can't do ARB_half_float_vertex. I tested it on RV350 long time ago
and it locked up pretty hard. fglrx lies and uses some fallback probably. If
you really need this extension, I can enable the fallback for r300g too.

r3xx cannot do GL_EXT_texture_swizzle with compressed textures, so it's
disabled if the S3TC lib is available and enabled otherwise. fglrx here lies
again and I don't think they use any kind of fallback.

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[Bug 35144] r300g should advertise GL_ARB_half_float_vertex on rv350

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35144

--- Comment #2 from Álmos <aaalmosss@gmail.com> 2011-03-09 09:52:44 PST ---
(In reply to comment #1)
> rv350 really can't do ARB_half_float_vertex. I tested it on RV350 long time ago
> and it locked up pretty hard. fglrx lies and uses some fallback probably. If
> you really need this extension, I can enable the fallback for r300g too.
It's not terribly important. I just noticed this inconsistency and decided to
ask if it is known. The fallback would be useful only if there were some really
important applications (like compiz or googleearth) requiring this extension,
but I don't think there are any.

> r3xx cannot do GL_EXT_texture_swizzle with compressed textures, so it's
> disabled if the S3TC lib is available and enabled otherwise. fglrx here lies
> again and I don't think they use any kind of fallback.
Sounds nasty. Maybe these quirks should be documented somewhere...

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[Bug 35144] r300g should advertise GL_ARB_half_float_vertex on rv350

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=35144

Marek Olšák <maraeo@gmail.com> changed:

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

--- Comment #3 from Marek Olšák <maraeo@gmail.com> 2011-03-10 21:33:39 PST ---
I am closing this bug.

Let me know if you need any of those extensions. RV350 is too slow for unigine
anyway.

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