c# - .NET 以 60 FPS 重绘？

Question

我在 OpenGL 上下文窗口中运行了一些动画，因此我需要不断重绘它。所以我想出了以下代码:

private void InitializeRedrawTimer()
{
    var timer = new Timer();
    timer.Interval = 1000 / 60;
    timer.Tick += new EventHandler(timer_Tick);
    timer.Start();
}

private void timer_Tick(object sender, EventArgs e)
{
   glWin.Draw();
}

虽然这只给我 40 FPS。但是，如果我将间隔设置为 1 毫秒，我可以达到 60。那么其他 20 毫秒去哪儿了？这仅仅是因为计时器的准确性差还是什么？如果我想让我的程序尽可能快地运行，有没有办法不断调用绘制函数？

Answer 1

您可以尝试实现一个游戏循环。

https://learn.microsoft.com/archive/blogs/tmiller/my-last-post-on-render-loops-hopefully

The basic loop (slightly modified from his original version and the version in the new SDK for ease of reading):

public void MainLoop()
{
        // Hook the application’s idle event
        System.Windows.Forms.Application.Idle += new EventHandler(OnApplicationIdle);
        System.Windows.Forms.Application.Run(myForm);
}    

private void OnApplicationIdle(object sender, EventArgs e)
{
    while (AppStillIdle)
    {
         // Render a frame during idle time (no messages are waiting)
         UpdateEnvironment();
         Render3DEnvironment();
    }
}

private bool AppStillIdle
{
     get
    {
        NativeMethods.Message msg;
        return !NativeMethods.PeekMessage(out msg, IntPtr.Zero, 0, 0, 0);
     }
}
    
//And the declarations for those two native methods members:        
[StructLayout(LayoutKind.Sequential)]
public struct Message
{
    public IntPtr hWnd;
    public WindowMessage msg;
    public IntPtr wParam;
    public IntPtr lParam;
    public uint time;
    public System.Drawing.Point p;
}

[System.Security.SuppressUnmanagedCodeSecurity] // We won’t use this maliciously
[DllImport(“User32.dll”, CharSet=CharSet.Auto)]
public static extern bool PeekMessage(out Message msg, IntPtr hWnd, uint messageFilterMin, uint messageFilterMax, uint flags);

Simple, elegant, effective. No extra allocations, no extra collections, it just works.. The Idle event fires when there’s no messages in the queue, and then the handler keeps looping continuously until a message does appear, in which case it stops.. Once all the messages are handled, the idle event is fired again, and the process starts over.

此链接描述了一个使用应用程序的空闲事件的链接。它可能有用。您可以简单地执行一点时间测试或 sleep 以将其减慢到所需的 fps。尝试使用 System.Diagnostics.StopWatch 类以获得最准确的计时器。

希望对您有所帮助。