[HOpenGL] RE: OpenGLRaw on Windows Vista

[Tobias Bexelius]

Hi again,

 

I've just solved my previous problem I had with the new HOpenGlRaw package.

 

It seems that wglGetProcAddress wont retreieve pointers for core 1.1 functions (like glClearColor) and these must be retrieved with standard GetProcAddress calls instead (see http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=261994).

 

I made these changes to cbits/HsOpenGLRaw.hs [18-22]:

 

void*

hs_OpenGLRaw_getProcAddress(const char *name)

{

  void* p = wglGetProcAddress((LPCSTR)name);

  if (p)

    return p;

  else

    return GetProcAddress(GetModuleHandle("opengl32"),(LPCSTR)name);

}

 

 

With those changes everything now works fine! I suggest you incorporate it into the next revision to make HOpenGLRaw work on windows for those of us that has opengl 3.1 hardware and drivers.

 

 

Regards

/Tobias Bexelius


 


From: tobias_bexelius at hotmail.com
To: hopengl at haskell.org
Subject: OpenGLRaw on Windows Vista
Date: Wed, 2 Sep 2009 21:51:38 +0200



Hi,
 
I'm having trouble with the new Opengl 2.3.0.0 that's based on openglRaw. When I run an old opengl example (http://netsuperbrain.com/blog/wp-content/uploads/2008/11/teapots.hs) that used to work with previous versions of  HOpenGL, I get the following error:
teapots.exe: user error (unknown OpenGL extension entry glLightfv, check for GL_ARB_compatibility)
 
This seems reasonable (OpenGl 3.1 doesnt support that fixed-function stuff without explicitly turning it on), but when I try to run my own small test program I get similar errors for OpenGL 3.1 stuff too:
Test.exe: user error (unknown OpenGL extension entry glClearColor, check for OpenGL 3.1)
 
If I don't put the glut32.dll in the same directory as those examples, I get an error saying something like:
teapots.exe: user error (unknown GLUT entry glutInit)
so maybe I need to tell my executables where to find the opengl dll to link against. I've tried to put opengl32.dll in the same directory, but with no luck. 
 
Suggestions, anyone? I have a Opengl 3.1 capable graphics card (ATI Radeon 4850) with new drivers (Castalyst 9.8).
 
 
/Tobias Bexelius



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