http://bugs.freedesktop.org/show_bug.cgi?id=22561
Summary: Some GLX_SGIX_fbconfig functions improperly check direct
extensions available when using indirect rendering
Product: Mesa
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: GLX
AssignedTo: [email protected]
ReportedBy: [email protected]
Created an attachment (id=27273)
--> (http://bugs.freedesktop.org/attachment.cgi?id=27273)
Patch which (incorrectly) removes the problematic calls to
__glXExtensionBitIsEnabled()
I'm using a Cygwin/X X server (which I'm writing some code for), which
announces GLX version 1.2 and the GLX_SGIX_fbconfig extension
Indirect rendering is forced for the client using LIBGL_ALWAYS_INDIRECT
glxgears_fbconfig demo fails due to glXCreateContextWithConfigSGIX failing.
The cause of this seems to be that the mesa implementation of
glXGetFBConfigFromVisualSGIX() uses __glXExtensionBitIsEnabled() to check if
the GLX_SGIX_fbconfig extension is available, but that function only checks if
the extension is supported for direct rendering.
Nothing else apart from these 3 functions from GLX_SGIX_fbconfig seems to use
__glXExtensionBitIsEnabled, so I'm not sure exactly what the bug is here, or
what the solution is.
Attached is a patch which removes those checks, and allows glxgears_fbconfig to
run successfully, but that's probably incorrect for the direct path.
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