Yes I'm sorry for the lack of details, here is what I could gather. I am using GHC 6.3 that I compiled from the fptools distribution that I downloaded from the CVS server whithout specifying any branch. It was compiled under windows XP in a cygwin environment, with all the mingw tools, targeting a mingw environment. I copied the glut.h from usr/include/GL into usr/local/include/mingw/GL. Unfortunately I only get a windows XP error window of the type "main.exe has encountered a problem and needs to close". The error report says the code of the exception is 0xc0000005 (access violation). I am sorry but I don't know how to get a more accurate error description. (I'm reading right now about the -xc RTS option so I might get back to you with a better error). However the error seems to clearly come from the call to blendEquation, since the program runs fine when I comment it out.
From having a look at the binding, my guess is that the call to hOpenGL_getProcAddress returns a NULL pointer, the reason for that would be that a configuration problem with the opengl headers and libraries when I built the package is causing hOpenGL_gpa in HsOpenGL.c to behave oddly.
The thing is I am very confused as to how GHC configures itself when it comes to the OpenGL headers and libraries. Does it use the headers in usr/local/include/mingw or usr/include/w32api, does it use the libraries from lib/w32api, or usr/local/gcc-lib, or the windows dlls, or something else ? The opengl32.dll in windows/system32 says it's version 5.1.2600.1106 The registry key for OpenGLDrivers points to atioglxx.dll, I could find 4 on my machine, the one in windows\system32 says it's version 6.14.10.4332, from Microsoft. I guess a good start would be to -know what implementation of OpenGL works best with HOpenGL under windows -place the corresponding files where fptools will look when configuring the build, and prevent it from finding headers that don't match libraries and vis versa -re-build HOpenGL It would be great if you could help me with the first two steps, in the meanwhile I'll be trying to figure things out. Yann