Win32 API standard window proc

win32_window_proc.c

LRESULT __stdcall window_proc(HWND window, UINT message, WPARAM wparam, LPARAM lparam) {
    switch(message) {
        // calls to BeginPaint and EndPaint are still needed
        // even when using newer rendering engines
        case WM_PAINT:
            {
                  PAINTSTRUCT ps;
                  VERIFY(BeginPaint(window, &ps));
                  EndPaint(window, &ps);
            }
            break;
        // indicates that application should terminate
        // PostQuitMessage(0) posts a WM_QUIT message 
        // which GetMessage() handles
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
    default:
        return DefWindowProc(window, message, wparam, lparam);
    }
    return 0;
}