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https://bugs.freedesktop.org/show_bug.cgi?id=3378
Summary: _glapi_add_entrypoint does not generate offset for
drivers
Product: DRI
Version: DRI CVS
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: libGL
AssignedTo: [email protected]
ReportedBy: [EMAIL PROTECTED]
BugsThisDependsOn: 3377
_glapi_add_entrypoint accepts an offset of ~0 for two reaons. The primary
reason is so that glXGetProcAddress can always return a non-NULL value. If an
unknown function is requested, a dummy stub will be generated and returned to
the application. The intention being that a loaded driver will later fill-in
the offset to complete the function.
The other reason is so that drivers can extend the GL API with functions that do
not have statically assigned offsets. For example, an IHV could add a new,
perhaps experimental, extension. It would register its functions by calling
'_glapi_add_entrypoint("glNewFunctionIHV", ~0)' and get the actual offset by
calling '_glapi_get_proc_offset("glNewFunctionIHV")'. This second usage
requires that libGL assign an offset. Currently, there is NO code to do this.
If a loaded driver calls _glapi_add_entrypoint with an offset of ~0, the offset
will remain ~0!
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