[SOLVED] How do I get Qt Creator to support more (or less?) recent OpenGL versions?
I'm porting to Qt some code that I used to compile under MSVC++. I get errors that certain OpenGL functions and constants are not defined, like the following:
error: 'GL_FUNC_ADD' was not declared in this scope
error: 'glBlendEquation' was not declared in this scope
Other OpenGL identifiers cause no problem, so it's not a question of me forgetting the include or the OpenGL module.
I know glBlendEquation was an extension at one point, but that was many years ago; it should be part of the standard by now. How do I get Qt to use a more recent OpenGL API?
Or maybe glBlendEquation is deprecated now. How do I get Qt to use a less recent API? Or is Qt using OpenGL ES?
Thank you for considering my questions.
I don't think this has anything to do with Qt. Are you correctly adding the needed includes?
I'm using #include <QtOpenGL>. As I already mentioned, other OpenGL identifiers (such as glBlendFunc) do not cause compiler errors, so it appears that Qt is providing a different version of the OpenGL API than the one I want.
Qt is not providing any OpenGL API -- it just #includes the OpenGL headers. I think Microsoft's gl.h is missing glBlendEquation. Can you check that?
If the system's OpenGL headers does not provide access to some part of the OpenGL API, then you have to use an OpenGL extension manager (like "GLEW":http://www.opengl.org/sdk/libs/GLEW/ or "GLEE":http://www.opengl.org/sdk/libs/GLee/). It appears that in the upcoming Qt 4.8, you may also use "QGLFunctions":http://doc.qt.nokia.com/4.8-snapshot/qglfunctions.html.
I tried using GLEW, because I was using that in the original MSVC project, but I kept getting linker errors no matter what I tried.
Today I downloaded GLee and included the source code in my project. The compiler errors are gone!