Getting OpenGL to work

[IoIxD]

I'd really like to get Apple's OpenGL SDK to work, but it seems like I can't actually link against the SDK that Apple provided. They seem to be CodeWarrior files? Which I can't link against.

Because the gl functions are expected to be present on the system, I imagine that there's something I need to modify in this compiler (or another codebase related to this) to get it working. But I have no idea where I'd even get started. Can anyone give me a rundown of what I'd need to do?

[jduerstock]

If you're referring to linking against the '*.lib' files from the OpenGL SDK, it might be easiest to just rebuild them from the included source. But perhaps I'm misreading the contents of the SDK.

[IoIxD]

Ok so I actually did find out how to compile the sources in a way that lines up with the libraries that Retro68 wants.

But it links against it and then doesn't see the function?

CMake

if(PLATFORM MATCHES retroppc)
    add_compile_definitions(FOR_PPC)
    set_target_properties(os9fetch PROPERTIES COMPILE_FLAGS "-ffunction-sections -mcpu=601 -O3 -Wall -Wextra -Wno-unused-parameter")
    set_target_properties(os9fetch PROPERTIES LINK_FLAGS "-Wl,-gc-sections")
    target_link_libraries( os9fetch PowerMgrLib)
    target_link_libraries( os9fetch NameRegistryLib)
    target_link_libraries( os9fetch OpenGL)
endif()

Confirming the library has the function and then seeing an error.

➜  os9fetch git:(master) ✗ powerpc-apple-macos-nm /opt/Retro68/toolchain/powerpc-apple-macos/lib/libOpenGL.a | grep "glGetString"
         U .glGetString
➜  os9fetch git:(master) ✗ ./build.sh
...
[  5%] Linking CXX executable os9fetch.code.bin
/opt/Retro68/toolchain/lib/gcc/powerpc-apple-macos/12.2.0/../../../../powerpc-apple-macos/bin/ld: CMakeFiles/os9fetch.dir/src/detection/gpu.cpp.obj:/home/gavin/Projects/os9fetch/src/detection/gpu.cpp:(.pr+0x14): undefined reference to `.glGetString'
/opt/Retro68/toolchain/lib/gcc/powerpc-apple-macos/12.2.0/../../../../powerpc-apple-macos/bin/ld: CMakeFiles/os9fetch.dir/src/detection/gpu.cpp.obj:/home/gavin/Projects/os9fetch/src/detection/gpu.cpp:(.pr+0x24): undefined reference to `.glGetString'
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/os9fetch.dir/build.make:353: os9fetch.xcoff] Error 1
make[1]: *** [CMakeFiles/Makefile2:85: CMakeFiles/os9fetch.dir/all] Error 2
make: *** [Makefile:91: all] Error 2

[IoIxD]

Oh wait, I should learn how nm works. The output of that says it's undefined.

So I'm back to square one.

[jduerstock]

Try linking against OpenGLLibraryStub, possibly?

$ DumpPEF OpenGLLibraryStub | grep -E "glGetString|Export"
0084 nbrExportSyms = 0x00000198 (408)
------ Loader Export Symbol Table ------
Section Address Class [Hashword] Export Name
250A [223] absolute 00000000 TVector [000B232E] glGetString

[IoIxD]

How?

[jduerstock]

target_link_libraries(os9fetch OpenGLLibaryStub)

possibly?

I am admittedly unfamiliar with Retro68 and CMake, but I am interested in seeing this work.

[autc04]

OpenGLLibraryStub is a library stub in PEF format, the GNU Linker cannot use that directly.
You should be able to use the MakeImport tool that is part of Retro68 to convert it/generate a stub library in XCOFF format.

[IoIxD]

OpenGLLibraryStub is a library stub in PEF format, the GNU Linker cannot use that directly. You should be able to use the MakeImport tool that is part of Retro68 to convert it/generate a stub library in XCOFF format.

➜  Libraries MakeImport OpenGLUtilityStub OpenGL.a
No 'cfrg' resource found.
➜  Libraries 

Seems I need to run it on a Mac. I do not have a modern Mac capable of doing this; I tried it over AppleTalk/mount_afp but it does not seem to make a difference.

[IoIxD]

If anyone does have these tools and could convert them for me, the files are avaliable here:

https://staticky.com/dl/ftp.apple.com/developer/opengl/SDK/

[IoIxD]

I was finally able to get my hands on a modern Mac, and using that, I was able to convert not only the OpenGL libraries, but also SDL 1.2 as a bonus!

They are avaliable here: https://github.com/IoIxD/os9libs

[autc04]

Sorry I couldn't assist earlier,.
Note that you do not need a modern Mac for the conversion, all you need is a way to extract the SDK package into a resource-fork preserving file format (such as MacBinary or AppleDouble).

But I didn't have ready-made instructions on how to do that until I had the time to come up with a working script.

[autc04]

For the Nix users, there is now a sample program with complete build scripts at https://github.com/autc04/RetroOpenGL/ .