Re: Darwin Port

Did anyone take a look at the patch I submit last December?  It 
addressed/fixed a lot of these linker problems and got things working 
for GLX applications on OS X.  I was planning on working on it further 
this summer but been kinda busy.

-jOrGe W.

On Jun 24, 2004, at 12:09 PM, Christopher Waters wrote:

> I did some browsing around the Mac documentation, and I came across 
> some articles on Umbrella Frameworks, which is another way of saying 
> "frameworks within frameworks." The nifty thing about these is that 
> when the dynamic linker cannot find a symbol in the base framework, it 
> looks in its child frameworks for the symbols.  This takes care of a 
> lot of problems the dynamic linker has given me about certain symbols 
> it expected to find in libGL.dylib (specifically gll_noop and 
> gll_pkey).  In order to implement this, though, we have to create a 
> temporary framework file structure.  The following is a list of the 
> folders I used to test this out:
>
> /private/tmp/OpenGL.framework
> cwaters% ls -lR
>  Frameworks -> Versions/Current/Frameworks
>  Headers -> Versions/Current/Headers
>  Libraries -> Versions/Current/Libraries
>  OpenGL -> Versions/Current/OpenGL
>  Resources -> Versions/Current/Resources
>  Versions
>
> ./Versions:
>  A
>  Current -> A
>
> ./Versions/A:
>  Frameworks
>  Headers -> 
> /System/Library/Frameworks/OpenGL.framework/Versions/A/Headers
>  Libraries
>  OpenGL -> /cr/lib/Darwin/libcrfaker.dylib
>  Resources -> 
> /System/Library/Frameworks/OpenGL.framework/Versions/A/Resources
>
> ./Versions/A/Frameworks:
>  NOpenGL.framework -> /System/Library/Frameworks/OpenGL.framework
>
> ./Versions/A/Libraries:
>  libGL.dylib -> /cr/lib/Darwin/libcrfaker.dylib
>
> After I made all the folders and symbolic links, I preappeneded "/tmp" 
> to DYLD_FRAMEWORK_PATH (in app_faker.c)
> I wouldn't say it worked sucessfully, since the program itself crashed 
> after creating/setting the context, but I would say that it -worked-, 
> in the sense that the faker's CGL functions were actually called.
>
> Attached is a diff between the HEAD app_faker.c and the app_faker.c 
> with the implementation I wrote for this purpose.
>
>  -Chris Waters
>
> <app_faker.diff>
>
> On Jun 23, 2004, at 2:11 PM, Christopher Waters wrote:
>
>> Attached is the "change log" I made.  The tarballed code can be found 
>> at: http://www.cse.msstate.edu/~crw7/vis/cr-1.1.tar.gz
>> I restarted off of HEAD yesterday morning, so it should be up to date.
>>
>> I got most of my ideas for all of this (using AGL in spus and CGL in 
>> faker; defining SPU before including arch.mk; etc) from Jorge's 
>> "Darwin Patch" mails.
>> Everything builds fine, but then goes downhill when trying to run the 
>> app faker :(
>>
>> There seems to be some trick in "tricking" the dynamic linker, too... 
>> forcing a flat namspace and then inserting the faker library only 
>> worked until you tried to call functions in the actual opengl 
>> library.
>>
>>  -Chris Waters
>>
>> <Darwin_work.rtf>



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