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Help => General => Topic started by: GLS on February 07, 2015, 08:56:53 pm

Title: SFML 2.2 and GLEW
Post by: GLS on February 07, 2015, 08:56:53 pm
Hi! Can't connect the glew library to the project, the studio gives error that the functions already defined or there are any conflicts.
Quote from tutorial: http://www.sfml-dev.org/tutorials/2.2/window-opengl.php (http://www.sfml-dev.org/tutorials/2.2/window-opengl.php)
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People sometimes think that SFML automatically includes GLEW (a library which manages OpenGL extensions) because SFML uses GLEW internally, but it's only an implementation detail. From the user's point of view, GLEW must be handled like any other external library.
Please explain in detail how to connect glew to sfml 2.2?
Title: Re: SFML 2.2 and GLEW
Post by: Laurent on February 07, 2015, 10:14:00 pm
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Please explain in detail how to connect glew to sfml 2.2?
Wrong question ;)

Show your errors so that we can solve your specific problem.
Title: Re: SFML 2.2 and GLEW
Post by: GLS on February 08, 2015, 07:37:37 pm
Can't linking glew and sfml statically, the studio gives error that the glew functions already defined.
(click to show/hide)
Title: Re: SFML 2.2 and GLEW
Post by: Laurent on February 08, 2015, 11:20:13 pm
Static SFML 2.2 doesn't embed its dependencies anymore, so if GLEW is linked twice, it's in your project settings.
Title: Re: SFML 2.2 and GLEW
Post by: GLS on February 09, 2015, 07:31:31 am
My project settings (visual c++ 2010):
C/C++ / General / Additional Include Directories:
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C:\Dev\glew-1.12.0\include;
C:\Dev\glm;
C:\Dev\SFML-2.2\include
Linker / General / Additional Library Directories:
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C:\Dev\SFML-2.2\lib;
C:\Dev\glew-1.12.0\lib\Release\Win32
C/C++ / Preprocessor / Preprocessor Definitions:
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SFML_STATIC;GLEW_STATIC;WIN32;NDEBUG;_CONSOLE
Linker » Input » Additional Dependencies:
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glew.lib;
glew32s.lib;
winmm.lib;
freetype.lib;
jpeg.lib;
opengl32.lib;
sfml-graphics-s.lib;
sfml-window-s.lib;
sfml-system-s.lib;
%(AdditionalDependencies)
Errors:
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1>glew.lib(glew.obj) : error LNK2005: ___glewCopyTexSubImage3D уже определен в glew32s.lib(glew.obj)
1>glew.lib(glew.obj) : error LNK2005: ___glewDrawRangeElements уже определен в glew32s.lib(glew.obj)
1>glew.lib(glew.obj) : error LNK2005: ___glewTexImage3D уже определен в glew32s.lib(glew.obj)
1>glew.lib(glew.obj) : error LNK2005: ___glewTexSubImage3D уже определен в glew32s.lib(glew.obj)
1>glew.lib(glew.obj) : error LNK2005: ___glewActiveTexture уже определен в glew32s.lib(glew.obj)
...

If Linker » Input » Additional Dependencies:
Quote
glew32s.lib;
winmm.lib;
freetype.lib;
jpeg.lib;
opengl32.lib;
sfml-graphics-s.lib;
sfml-window-s.lib;
sfml-system-s.lib;
%(AdditionalDependencies)
Errors:
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1>LINK : warning LNK4098: библиотека по умолчанию "LIBCMT" противоречит использованию других библиотек; используйте параметр /NODEFAULTLIB:library
1>sfml-graphics-s.lib(GLExtensions.cpp.obj) : error LNK2001: неразрешенный внешний символ "_glewGetErrorString"
1>sfml-graphics-s.lib(GLExtensions.cpp.obj) : error LNK2001: неразрешенный внешний символ "_glewInit"

If Linker » Input » Additional Dependencies:
Quote
glew.lib;
winmm.lib;
freetype.lib;
jpeg.lib;
opengl32.lib;
sfml-graphics-s.lib;
sfml-window-s.lib;
sfml-system-s.lib;
%(AdditionalDependencies)
Errors:
Quote
1>main.obj : error LNK2001: неразрешенный внешний символ "_glewInit@0"
Title: Re: SFML 2.2 and GLEW
Post by: Laurent on February 09, 2015, 07:55:36 am
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1>LINK : warning LNK4098: библиотека по умолчанию "LIBCMT" противоречит использованию других библиотек; используйте параметр /NODEFAULTLIB:library
1>sfml-graphics-s.lib(GLExtensions.cpp.obj) : error LNK2001: неразрешенный внешний символ "_glewGetErrorString"
1>sfml-graphics-s.lib(GLExtensions.cpp.obj) : error LNK2001: неразрешенный внешний символ "_glewInit"
Quote
1>main.obj : error LNK2001: неразрешенный внешний символ "_glewInit@0"
Seriously?
Title: Re: SFML 2.2 and GLEW
Post by: GLS on February 09, 2015, 08:00:20 am
Quote from: Laurent on February 09, 2015, 07:55:36 am
Seriously?
Sorry, I don't understand the question?
Title: Re: SFML 2.2 and GLEW
Post by: Laurent on February 09, 2015, 08:42:34 am
I don't understand the error messages...
Title: Re: SFML 2.2 and GLEW
Post by: GLS on February 09, 2015, 10:58:59 am
Quote from: Laurent on February 09, 2015, 08:42:34 am
I don't understand the error messages...
Sorry, my visual studio only in russian language
Quote
1>LINK : warning LNK4098: defaultlib "LIBCMT" conflicts with use of other libs; use /NODEFAULTLIB:library
1>sfml-graphics-s.lib(GLExtensions.cpp.obj) : error LNK2001: unresolved external symbol "_glewGetErrorString"
1>sfml-graphics-s.lib(GLExtensions.cpp.obj) : error LNK2001: unresolved external symbol "_glewInit"
Quote
1>main.obj : error LNK2001: unresolved external symbol "_glewInit@0"
Title: Re: SFML 2.2 and GLEW
Post by: Laurent on February 09, 2015, 11:16:51 am
Thanks.

SFML depends on a statically linked GLEW, so you need to link (only) glew32s.lib and define the GLEW_STATIC preprocessor symbol.

Now I have no idea why you still have unresolved symbols with this configuration. It should work fine.
Title: Re: SFML 2.2 and GLEW
Post by: GLS on February 09, 2015, 11:26:09 am
may be I need to use another version of glew?
current version 1.12.0
Title: Re: SFML 2.2 and GLEW
Post by: maly on February 09, 2015, 12:27:44 pm
You need to recompile SFML with your version of glew.
Title: Re: SFML 2.2 and GLEW
Post by: Laurent on February 09, 2015, 01:11:13 pm
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may be I need to use another version of glew?
No, it should work.

Quote
You need to recompile SFML with your version of glew.
No...
Title: Re: SFML 2.2 and GLEW
Post by: maly on February 09, 2015, 02:01:36 pm
Quote
Quote
You need to recompile SFML with your version of glew.
No...

Interesting, because without recompiling I have the same errors.
Title: Re: SFML 2.2 and GLEW
Post by: Laurent on February 09, 2015, 02:16:31 pm
Quote
Interesting, because without recompiling I have the same errors.
Which compiler do you use?
Title: Re: SFML 2.2 and GLEW
Post by: maly on February 09, 2015, 02:51:07 pm
Visual C++ 2008 Express.
Title: Re: SFML 2.2 and GLEW
Post by: GLS on February 09, 2015, 03:55:53 pm
In Code::Blocks everything works, but there are warnings:
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=== Build: Release in GLS (compiler: GNU GCC Compiler) ===
Warning: resolving _glewInit by linking to _glewInit@0
Warning: resolving _glewGetErrorString by linking to _glewGetErrorString@4
Warning: .drectve `/DEFAULTLIB:"LIBCMT" /DEFAULTLIB:"OLDNAMES" ' unrecognized
=== Build finished: 0 error(s), 3 warning(s) (0 minute(s), 4 second(s)) ===
=== Run: Release in GLS (compiler: GNU GCC Compiler) ===
Title: Re: SFML 2.2 and GLEW
Post by: Zyl on February 10, 2015, 06:07:41 pm
Cheers people. I had the same problem with SFML 2.2. Adding GLEW_STATIC helped with my x64 build where I need to link glew.lib only. For the x86 one, strangely I need to link glew32.lib AND glew.lib to compile without warnings, yet still have dynamic linkage with GLEW_STATIC (i.e. get missing dll error for glew32.dll on load). I'm still checking my properties to make sure I haven't missed anything. Using MSVC 2010.