Re: gl calls before context set up = crash!

Initially, all functions are supposed to jump into no-op functions.

In the NULLfuncs.c file, when we declare (define?) the glim table, we 
initialize all the pointers to no-op functions.

Jonathan, could you use a debugger to examine the value of 
glim.SomeFunc to make sure it points to a null/no-op function?

-Brian

Greg Humphreys wrote:
> I'm pretty sure that at some point in the past glim was set up to
> point to the NOP spu, which was always loaded by default.  Has this
> changed?
> 
> 
> On Fri, 25 Feb 2005 19:46:15 -0700, [email protected]
> <[email protected]> wrote:
> 
>>Hi all,
>>
>>My research group is working on some modifications to Cr to allow head-tracked
>>stereo for CAVE-type environments and we've had some good success!
>>
>>But I've run into a nasty problem: we're running a 3rd-party client app that's
>>very naughty... It appears to be calling gl calls before setting up its
>>rendering context.
>>
>>We're working on Windows, starting from the 1.7 release code (I know, I should
>>probably grab what's in CVS...) and the functions in windows_exports.c
>>typically do the following:
>>
>>NAKED void cr_SomeFunc( argsGoHere )
>>{
>>        __asm jmp [glim.SomeFunc]
>>        UNUSED( argsGoHere );
>>}
>>
>>I haven't dug too far into this yet, but I think this blind jmp is the
>>problem, since glim hasn't been set up yet. We would either need to test for
>>this or glim needs to be set up sooner...
>>
>>Can anyone comment on what would be involved in getting a high-performance
>>work-around going for this degenerate case!
>>
>>Thanks,
>>Jon
>>
>>Jonathan Marbach
>>BP Center for Visualization
>>3400 Marine St.
>>Boulder, CO 80218
>>www.bpvizcenter.com
>>
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> 
> 
> 



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