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pauljg

OpenGL Compiling OpenGL with DEV-C (Mingw)

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Hi, I''m using DEV-C package which I think is running with the MingW compiler. I''ve noticed that some of the newer OPENGL examples/demos wont compile. I think the problem is that they need a newer version, DEV comes with 1.1. Does any kind soul know where I can get some up-to-date precompiled libs & headers. I dont have MSVC, so I cant just compile the latest version. I''ve looked everywhere - but no luck !. Please Help !

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Yes, you are using mingw that is a Windows port of gcc. The latest can be found at www.mingw.org

Mingw will never be shipped with complete headers but they should be good enough for OpenGL and general Windows programming. What kind of errors do you get?
MSVC has some non ANSI stuff but if you add -fno-for-scope and -fpermissive to the compiler settings will in most cases the programs be built.

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I don''t have any errors with it, but I can''t get at the new instructions that are only available in 1.2 upwards. (such as GlRangeDrawElements() or locking the vertexes)

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It is exactly the same thing with all other Windows compilers including MSVC. You must have a extra header file called glext.h
http://oss.sgi.com/projects/ogl-sample/ABI/glext.h
They used to have a little library that did that did the extra work somewhere here
http://oss.sgi.com/projects/ogl-sample/registry/index.html
but I did not find it. Here is a text about using extensions
http://opengl.org/developers/code/features/OGLextensions/OGLextensions.html

Remembet that you can get entry points for all functions for the OpenGL version the driver supports but not all of them needs to have hardware support.

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ermm.. not with DEV-C I dont seem to be able to.

Multitexturing works fine

I Downloaded the Nvidia opengl sdk headers, the glDrawra.. instruction is mentioned in the header GL, compiling now gives me a different error:

undefined reference to ''glDrawRangeElements@24''

I can only guess that I''m getting this error because it isnt in the lib ?

Thanks for your time.

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gcc needs special unix like libs to be able to link agains windows DLL''s. these libs are generated using the pexports and dlltool utilities. you can get those or just download the latest mingw distribution, it has ogl headers and special libs already. in other words, don''t use stuff from nvidia''s site.

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I think you mean import libraries but unix does not use something like that. Mingw does not come with any headers but the one for MSVC is good and can be downloaded from MS. Dev-C++ already has it. The compiler is also in most cases satisfied with import libraries for MSVC but not always so that could be reason for your problem with the nvidia SDK. Perhaps do they have some other library that you forgot to link to?

Anyway, the reason for this post is that I found the link to Intel''s library mentioned earlier:
http://oss.sgi.com/projects/ogl-sample/sdk.html

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Thanks guys - the problem is sorted.

I needed the new headers, not new libs. one of my problems was that I was also running SDL which requires me to call the extra functions through its own structure.

I did try building a new set of LIBS using pexport and dlltool, which sorta worked.. but had quite a few functions missing from it. I guess pexport wasnt happy reading the dll.

Anyway thanks, and YES - it is possible to use DEV with latest extensions. (just like you all said it was)

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