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支持Windows，Mac，Linux NES模拟器内核源码来自 https://github.com/colinvella/EmuNes 他这边的源码功能很完善了的，支持视频录制，手柄，金手指等等。现在移植到cpf来实现跨平台测试，不过这边的移植测试里并没有把所有功能移植完整。

移植这个，主要就是图形绘制和音频播放适配。

需要开启代码优化才能有足够的帧数，否则会很卡。

绘制和控制的代码主要在 NesVideoPanel 类里

将游戏画面绘制出来

        protected override void OnRender(DrawingContext dc)
        {
            base.OnRender(dc);
            if (bitmapBuffer != null)
            {
                dc.DrawImage(bitmapBuffer.Bitmap, new Rect(new Point(), ActualSize), new Rect(0, 0, bitmapBuffer.Bitmap.Width, bitmapBuffer.Bitmap.Height));
                if (gameState == GameState.Paused)
                {
                    var size = ActualSize;
                    dc.DrawImage(FilterPause, new Rect(new Point(), ActualSize), new Rect(0, 0, FilterPause.Width, FilterPause.Height));
                    var textSize = dc.DrawingFactory.MeasureString("暂停", new Font(FontFamily, 36, FontStyles.Italic));

                    var outlineThickness = size.Height / 120;
                    textSize.Width += outlineThickness;
                    textSize.Height += outlineThickness;

                    float textX = (size.Width - textSize.Width) / 2;
                    float textY = (size.Height - textSize.Height) / 2;

                    using (PathGeometry graphicsPath = new PathGeometry(new Font(this.FontFamily, 36, FontStyles.Italic), "暂停"))
                    using (SolidColorBrush outlinePen = new SolidColorBrush(Color.Black))
                    using (LinearGradientBrush linearGradientBrush = new LinearGradientBrush(new GradientStop[] { new GradientStop(Color.White, 0), new GradientStop(Color.LightSkyBlue, 1) }, new Point(), new Point(0, textSize.Height), Matrix.Identity))
                    {
                        var m = Matrix.Identity;
                        m.Translate(textX, textY);
                        graphicsPath.Transform(m);
                        dc.DrawPath(outlinePen, new Stroke(outlineThickness) { LineJoin = LineJoins.Round }, graphicsPath);
                        dc.FillPath(linearGradientBrush, graphicsPath);
                    }
                }
            }
        }

键盘操作

        protected override void OnKeyDown(KeyEventArgs e)
        {
            base.OnKeyDown(e);
            if (e.Key == Keys.Tab)
            {
                e.Handled = true;
            }
            keyboardState[e.Key] = true;
        }

        protected override void OnKeyUp(KeyEventArgs e)
        {
            base.OnKeyUp(e);
            keyboardState[e.Key] = false;
        }