Question

I’ve already set GLFW library up and according to it’s User Guide, I should use glfwInit() function to initialize it. After that I should be able to – for example – call callback function after I press key on my keyboard, but this function wasn’t called, so I tried with something easier – getting mouse position. But it also doesn’t work, so I assume that something is wrong with my whole GLFW.

This is main loop for my application:

while (!m_exit)
{

    int x, y;
    glfwGetMousePos(&x, &y);
    glfwPollEvents();
    gameCycle();                        // Do one cycle

    while (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE))
    {
        // Check the pressence of commands
        if (!GetMessage (&msg, NULL, 0, 0))
        {
            return msg.wParam; // Hand the control on to system
        }

        TranslateMessage (&msg);
        DispatchMessage (&msg);
    }
}

Also before this loop, I initialize my GLFW:

// Initialize GLFW
if( !glfwInit() )
{
    exit( EXIT_FAILURE );
}

glfwSetKeyCallback(processKeys);

// Main message loop:
int loopRet = g_pGameAppLayer->mainLoop();

When I check values which are saved in x and y variables, I get only -858993460 which indicates that no value is passed to them.

So what am I missing in setting GLFW up?

Answer 1

Your problem is here:

After that I should be able to – for example – call callback function after I press key on my keyboard

No, you shouldn’t. Until you have created a window with GLFW, you can’t get input. This is generally true of many windowing systems; you only get input if you have a window.