get openGL version

gistfile1.cpp

static void GetGLVersion(int* major, int* minor)
{
    // for all versions
    char* ver = (char*)glGetString(GL_VERSION); // ver = "3.2.0"
    
    *major = ver[0] - '0';
    if( *major >= 3)
    {
        // for GL 3.x
        glGetIntegerv(GL_MAJOR_VERSION, major); // major = 3
        glGetIntegerv(GL_MINOR_VERSION, minor); // minor = 2
    }
    else
    {
        *minor = ver[2] - '0';
    }
    
    // GLSL
    ver = (char*)glGetString(GL_SHADING_LANGUAGE_VERSION); // ver = "1.50 NVIDIA via Cg compiler"
}