init_opengl.c

// Despite appearances to the contrary, this does proper error handling. Any error cascades into a failure of the wglGetProcAddress.
int init_opengl() {
    HWND window = CreateWindowA("edit", "", WS_OVERLAPPEDWINDOW, 0, 0, 0, 0, NULL, NULL, NULL, NULL);

    PIXELFORMATDESCRIPTOR format_desc = {
        .nSize = sizeof(PIXELFORMATDESCRIPTOR),
        .nVersion = 1,
        .dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL
    };

    HDC dc = GetDC(window);
    int format = ChoosePixelFormat(dc, &format_desc);
    SetPixelFormat(dc, format, &format_desc);
    HGLRC rc = wglCreateContext(dc);
    wglMakeCurrent(dc, rc);

    wglCreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)wglGetProcAddress("wglCreateContextAttribsARB");

    wglDeleteContext(rc);
    ReleaseDC(window, dc);
    DestroyWindow(window);

    return wglCreateContextAttribsARB != NULL;
}