https://bugs.freedesktop.org/show_bug.cgi?id=28363
Andre Maasikas amaasikas@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- Product|DRI |Mesa Version|XOrg CVS |git Component|DRM/Radeon |Mesa core AssignedTo|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop. |.org |org
--- Comment #7 from Andre Maasikas amaasikas@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