[Piglit] [PATCH 2/2] glx-destroycontext-3: A new way to mess with glXDestroyContext().

[Brian Paul]

On Fri, Feb 4, 2011 at 4:48 PM, Eric Anholt <eric at anholt.net> wrote:
> A side note: There's some weird spec text about contexts.  They're
> pointers to GLX structures, so they're freed on destroy.  But if you
> destroy a pointer that "is not a valid rendering context", it's
> supposed to throw GLXBadContext.  I'm not sure how it should intuit
> that some arbitrary pointer is not a valid context without
> dereferencing that pointer and segfaulting instead.

I think once upon a time, GLXContext was defined in glx.h as an opaque
handle, like an X GC or GLXDrawable.  If that was the case, the
GLXContext handle could be validated.  Maybe that's where the language
comes from.

Of course, context pointers could be validated too if we kept a list
of all the contexts we've created.

-Brian