问SharpDx direct3d11如何开始呈现

EN

using System;
using SharpDX.Windows;
using SharpDX.DXGI;
using SharpDX.Direct3D11;

using Device = SharpDX.Direct3D11.Device;
using Device1 = SharpDX.Direct3D11.Device1;

namespace CurrencyConverter
{
    static class Program
    {[STAThread]
            static void Main()
            {
                // Enable object tracking
                SharpDX.Configuration.EnableObjectTracking = true;
                SharpDX.Animation.Timer timer = new SharpDX.Animation.Timer();

                #region Direct3D Initialization
                // Create the window to render to
                Form1 form = new Form1();
                form.Text = "D3DRendering - EmptyProject";
                form.Width = 640;
                form.Height = 480;
                // Declare the device and swapChain vars
                Device device;
                SwapChain swapChain;
                // Create the device and swapchain
                // First create a regular D3D11 device
                using (var device11 = new Device(
                 SharpDX.Direct3D.DriverType.Hardware,
                 DeviceCreationFlags.None,
                 new[] {
     SharpDX.Direct3D.FeatureLevel.Level_11_1,
     SharpDX.Direct3D.FeatureLevel.Level_11_0,
                 }))
                {
                    // Query device for the Device1 interface (ID3D11Device1)
                    device = device11.QueryInterfaceOrNull<Device1>();
                    if (device == null)
                        throw new NotSupportedException(
                        "SharpDX.Direct3D11.Device1 is not supported");
                }// Rather than create a new DXGI Factory we reuse the
                 // one that has been used internally to create the device
                using (var dxgi = device.QueryInterface<SharpDX.DXGI.Device2>())
                using (var adapter = dxgi.Adapter)
                using (var factory = adapter.GetParent<Factory2>())
                {
                    var desc1 = new SwapChainDescription1()
                    {
                        Width = form.ClientSize.Width,
                        Height = form.ClientSize.Height,
                        Format = Format.R8G8B8A8_UNorm,
                        Stereo = false,
                        SampleDescription = new SampleDescription(1, 0),
                        Usage = Usage.BackBuffer | Usage.RenderTargetOutput,
                        BufferCount = 1,
                        Scaling = Scaling.Stretch,
                        SwapEffect = SwapEffect.Discard,
                    };
                    swapChain = new SwapChain1(factory,
                    device,
                    form.Handle,
                    ref desc1,
                    new SwapChainFullScreenDescription()
                    {
                        RefreshRate = new Rational(60, 1),
                        Scaling = DisplayModeScaling.Centered,
                        Windowed = true
                    },
                    // Restrict output to specific Output (monitor)
                    adapter.Outputs[0]);
                }

                // Create references for backBuffer and renderTargetView
                var backBuffer = Texture2D.FromSwapChain<Texture2D>(swapChain,
               0);
                var renderTargetView = new RenderTargetView(device,
               backBuffer);
                #endregion

                // Setup object debug names
                device.DebugName = "The Device";
                swapChain.DebugName = "The SwapChain";
                backBuffer.DebugName = "The Backbuffer";
                renderTargetView.DebugName = "The RenderTargetView";

                #region Render loop
                // Create and run the render loop
                RenderLoop.Run(form, () =>
                {
                    // Clear the render target with...
                    var lerpColor = SharpDX.Color.Lerp(SharpDX.Color.White,
     SharpDX.Color.DarkBlue,
     (float)((timer.Time) / 10.0 % 1.0));
                    device.ImmediateContext.ClearRenderTargetView(
                     renderTargetView,
                     lerpColor);

                    // Execute rendering commands here...
                    //...
                    //I DO NOT HAVE ANY IDEA
                    //...
                    // Present the frame
                    swapChain.Present(0, PresentFlags.RestrictToOutput); 
                });
                #endregion

                #region Direct3D Cleanup
                // Release the device and any other resources created
                renderTargetView.Dispose();
                backBuffer.Dispose();
                device.Dispose();
                swapChain.Dispose();
                #endregion
            }
}
}