[Bug 28363] [r600c, kms] shadows wrong in doom3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28363

Andre Maasikas <amaasikas at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|DRI                         |Mesa
            Version|XOrg CVS                    |git
          Component|DRM/Radeon                  |Mesa core
         AssignedTo|dri-devel at lists.freedesktop |mesa-dev at lists.freedesktop.
                   |.org                        |org

--- Comment #7 from Andre Maasikas <amaasikas at gmail.com> 2010-06-03 12:39:00 PDT ---
I looked it a while back and if i remember correctly this went like:
Doom uses ext_stencil_two_side if available
There's 2 back stencil states: 
1 opengl 2.0
2 ext_stencil_two_side
Mesa sets ctx->Stencil._BackFace to 2 if GL_STENCIL_TEST_TWO_SIDE_EXT
is enabled and to 1 otherwise - this is what r600 and also intel? uses

Doom3 does some stencil setup while
GL_STENCIL_TEST_TWO_SIDE_EXT disabled and the driver uses wrong values then

The spec is imho also inconclusive but i read it as
GL_STENCIL_TEST_TWO_SIDE_EXT
should be 'tested' at rendering time and you can set up backface stencil state
(via glActiveStencilFaceEXT) while this enable is not (yet) set.

2 options, use ctx->Stencil.ActiveFace in driver as in stencil.c
or set ctx->Stencil._BackFace also to 2 in _mesa_ActiveStencilFaceEXT()

I'm setting this to core mesa for comments

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