How to use GLEW with Qt?
I want to use GLEW with Qt under Windows (7 if that matters).
What I did was go to the GLEW website, download the package for windows, then put the glew.dll in System32 folder. In my pro file, I referenced the .lib files with LIBS += .../path_to_the_libs/glew32.lib and the same for glew32s.lib (not sure what the latter's for). In my QGLWidget subclass, I made sure that glew.h is included before <QGLWidget> and therefore before gl.h and glu.h. In the main() function the first thing I do is call glewInit and call glGetError but my application exits with some weird code, like a very large negative number.
I have a suspicion that there are very may thing I do wrong(I am relatively new to Qt and OpenGL and absolutely new to GLEW), but I also have a suspicion that one of the major errors is that the libs, I suppose, were built with MSVC and therefore cannot be linked against with MinGW... Anyway, can anyone please provide a step-by-step instruction how to install GLEW with Qt and use it? I would much appreciate it. Thank you in advance
Edit: Guys, maybe I am asking for too much, but I would really really like a step-by-step instruction :)
Answer
You're not supposed to call glewInit() before you have your OpenGL context ready. Call it just before your first gl* calls, not at the beginning of main. That should do the trick.
Also, don't use glew32.lib and glew32s.lib simultaneously - the former is to use along with the DLL file and the latter is static (your .exe gets bigger but you don't have to distribute your application with the .dll). Decide and use either.