DX12框架初始化

在DX12的框架（框架代码）下初始化一个窗口程序，首先创建一个WIN32的空项目，然后把项目属性里面的目标平台定位到10.0.10240.0以上。接下来就是创建一个继承D3DApp的类

#include "../Common/d3dApp.h"#include <DirectXColors.h>using namespace DirectX;class TraceZLDemoApp :public D3DApp{public:    TraceZLDemoApp(HINSTANCE hInstance);    ~TraceZLDemoApp();    virtual bool Initialize()override;private:    virtual void OnResize()override;    virtual void Update(const GameTimer& gt)override;    virtual void Draw(const GameTimer& gt)override;    void DrawRenderItems(ID3D12GraphicsCommandList * cmdList, const std::vector<RenderItem*>& ritems);};/// <summary>/// 入口函数/// </summary>/// <param name="hInstance"> </param>/// <returns></returns>int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE prevInstance,    PSTR cmdLine, int showCmd)//WINDOS入口函数{    // Enable run-time memory check for debug builds.#if defined(DEBUG) | defined(_DEBUG)    _CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF);#endif    try    {        TraceZLDemoApp theApp(hInstance);        if (!theApp.Initialize())//调用Initialize函数进行初始化            return 0;        return theApp.Run();//如果调用初始化函数成功继续调用Run()函数，并返回Run()的返回值    }    catch (DxException& e)    {        MessageBox(nullptr, e.ToString().c_str(), L"HR Failed", MB_OK);//发生错误弹出带OK按钮的消息框        return 0;    }}    /// <summary>    /// 构造函数    /// </summary>    TraceZLDemoApp::TraceZLDemoApp(HINSTANCE hInstance)        :D3DApp(hInstance)    {    }    /// <summary>    /// 析构函数    /// </summary>    TraceZLDemoApp::~TraceZLDemoApp()    {    }    /// <summary>    /// 用来进行初始化    /// </summary>    ///<returns>返回是否成功初始化</returns>    bool TraceZLDemoApp::Initialize()//重写Initialize()这个虚函数    {        if (!D3DApp::Initialize())//调用父类的Initalize函数            return false;        return true;    }    /// <summary>    /// 调节窗口大小是调用    /// </summary>    void TraceZLDemoApp::OnResize()//重写虚函数，    {        D3DApp::OnResize();//调用父类的函数    }    /// <summary>    /// 每帧调用一次该函数用来更新数据    /// </summary>    /// <param name="gt"> 传入时间对象</param>    void TraceZLDemoApp::Update(const GameTimer& gt)//重写虚函数，    {    }    /// <summary>    /// 每帧调用一次该函数，使用GPU渲染    /// </summary>    /// <param name="gt"> 传入时间对象</param>    void TraceZLDemoApp::Draw(const GameTimer& gt)//重写虚函数，    {        ThrowIfFailed(mDirectCmdListAlloc->Reset());//??        ThrowIfFailed(mCommandList->Reset(mDirectCmdListAlloc.Get(), nullptr));//初始化命令行列表        //设置GPU和CPU同步的障碍点        mCommandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(CurrentBackBuffer(),            D3D12_RESOURCE_STATE_PRESENT, D3D12_RESOURCE_STATE_RENDER_TARGET));        // 设置视口（显示到屏幕的大小和位置）        mCommandList->RSSetViewports(1, &mScreenViewport);        //设置剪裁空间转换出来的贴图大小        mCommandList->RSSetScissorRects(1, &mScissorRect);        // 清空深度和后台缓存区        mCommandList->ClearRenderTargetView(CurrentBackBufferView(), Colors::LightSteelBlue, 0, nullptr);        mCommandList->ClearDepthStencilView(DepthStencilView(), D3D12_CLEAR_FLAG_DEPTH | D3D12_CLEAR_FLAG_STENCIL, 1.0f, 0, 0, nullptr);        // 指定要渲染的缓存区        mCommandList->OMSetRenderTargets(1, &CurrentBackBufferView(), true, &DepthStencilView());        // 显示在资源使用状态转换。        mCommandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(CurrentBackBuffer(),            D3D12_RESOURCE_STATE_RENDER_TARGET, D3D12_RESOURCE_STATE_PRESENT));        // 关闭命令列表        ThrowIfFailed(mCommandList->Close());        // Add the command list to the queue for execution.        ID3D12CommandList* cmdsLists[] = { mCommandList.Get() };        mCommandQueue->ExecuteCommandLists(_countof(cmdsLists), cmdsLists);        // 把后台缓冲区的翻转到前台        ThrowIfFailed(mSwapChain->Present(0, 0));        mCurrBackBuffer = (mCurrBackBuffer + 1) % SwapChainBufferCount;        //同步GPU和CPU        FlushCommandQueue();    }

**#include “../Common/d3dApp.h”**Common里面放的就是我们龙书里面额框架代码，这里是用的相对位置，你需要引入你自己的框架代码所在的位置。