关于Windows Phone 7.1中XNA的帧率问题

最新推荐文章于 2025-11-27 11:45:47 发布

转载最新推荐文章于 2025-11-27 11:45:47 发布 · 764 阅读

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#windows phone #vector #string #class #测试 #微软

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本文介绍如何在Windows Phone 7.1系统中通过修改Game.TargetElapsedTimer属性及插入特定代码来解决XNA帧率限制问题，实现60帧流畅运行。

微软在Windows Phone 7.1系统里面取消了XNA最大帧率只能达到30帧的限制,但是直接修改Game.TargetElapsedTime属性在模拟器上有效,但在真实设备上无效,按照下面的步骤就可以解决这个问题:

1.在Game的构造函数中修改Game.TargetElapsedTime属性(如果要达到60帧,只要在数字后面加上"/2")就行了

2.插入这样下面代码:

graphics.PreparingDeviceSettings += (sender, e) => le.GraphicsDeviceInformation.PresentationParameters.PresentationInterval = PresentInterval.One;

提供一个测试XNA帧率的例程(60帧):

using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Graphics;

namespace WindowsPhoneGame
{
    public class MyGame : Microsoft.Xna.Framework.Game
    {
        GraphicsDeviceManager graphics;
        SpriteBatch spriteBatch;
        private TimeSpan _elapsedTime = TimeSpan.Zero;
        private int _frameCounter;
        private int _frameRate;
        private Vector2 _position=new Vector2(0,0);
        private SpriteFont _spriteFont;

        public MyGame()
        {
            graphics = new GraphicsDeviceManager(this);
            Content.RootDirectory = "Content";
            graphics.PreparingDeviceSettings += (sender, e) => e.GraphicsDeviceInformation.PresentationParameters.PresentationInterval = PresentInterval.One;
            TargetElapsedTime = TimeSpan.FromTicks(333333/2);
            InactiveSleepTime = TimeSpan.FromSeconds(1);

}

protected override void Initialize()
{ base.Initialize(); }

        protected override void LoadContent()
        {
            spriteBatch = new SpriteBatch(GraphicsDevice);
            _spriteFont = Content.Load<SpriteFont>("SpriteFont");//请自行添加SpriteFont资源.
        }

        protected override void Update(GameTime gameTime)
        {
            if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
                this.Exit();
            _elapsedTime += gameTime.ElapsedGameTime;
            if (_elapsedTime <= TimeSpan.FromSeconds(1))
                return;
            _elapsedTime -= TimeSpan.FromSeconds(1);
            _frameRate = _frameCounter;
            _frameCounter = 0;
            base.Update(gameTime);
        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.CornflowerBlue);
            _frameCounter++;
            string fps = string.Format("{0} fps", _frameRate);
            spriteBatch.Begin();
            spriteBatch.DrawString(_spriteFont, fps, _position, Color.Red);
            spriteBatch.End();
            base.Draw(gameTime);
        }
    }
}

参考网址: http://social.msdn.microsoft.com/Forums/zh-CN/windowsphonezhchs/thread/06775444-8869-4609-8661-700e10add799