DirectX10 学习笔记2：在多文档框架中初始化DirectX 10

显示功能是在视图类中完成的，所以DX10的初始化及绘制工作都是视图类中完成。

首先建立一个多文档工程，工程名为02_01，在视图类头文件中加载相关的库，并包含头文件：

在视图类的头文件中添加DX10相关的成员：

其中三个变换矩阵、m_device以及显卡有关信息通过五个公有函数访问：

下面是DX具体的初始化过程，封装为一个视图类的成员函数InitDX()。

DX初始化过程中需要创建设备和交换链，在创建交换链的时候用到和视图窗口有关的几个参数：窗口的宽、高和窗口的句柄：

接下来是交换链、纹理资源、2D纹理描述结构体等，其中screenNear和screenDepth是渲染的深度范围，m_vsync_enabled设置为真，表明后面会根据实际的硬件设备设置刷新率，否则是尽可能快地刷新：

以下代码填充DXGI_SWAP_CHAIN_DESC结构体中在初始化过程中用到的一些成员：

 

    // Initialize the swap chain description.

    ZeroMemory(&swapChainDesc, sizeof(swapChainDesc));

    // Set to a single back buffer.

    swapChainDesc.BufferCount = 1;

    // Set the width and height of the back buffer.

    swapChainDesc.BufferDesc.Width = screenWidth;

    swapChainDesc.BufferDesc.Height = screenHeight;

    // Set regular 32-bit surface for the back buffer.

    swapChainDesc.BufferDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;

    // Set the refresh rate of the back buffer.

    if(m_vsync_enabled)

    {

        swapChainDesc.BufferDesc.RefreshRate.Numerator = 1;

        swapChainDesc.BufferDesc.RefreshRate.Denominator = 60;

    }

    else

    {

        swapChainDesc.BufferDesc.RefreshRate.Numerator = 0;

        swapChainDesc.BufferDesc.RefreshRate.Denominator = 1;

    }

    // Set the usage of the back buffer.

    swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;

    // Set the handle for the window to render to.

    swapChainDesc.OutputWindow = hwnd;

    // Turn multisampling off.

    swapChainDesc.SampleDesc.Count = 1;

    swapChainDesc.SampleDesc.Quality = 0;

    // Set to full screen or windowed mode.

    swapChainDesc.Windowed = true;

    // Set the scan line ordering and scaling to unspecified.

    swapChainDesc.BufferDesc.ScanlineOrdering = DXGI_MODE_SCANLINE_ORDER_UNSPECIFIED;

    swapChainDesc.BufferDesc.Scaling = DXGI_MODE_SCALING_UNSPECIFIED;

    // Discard the back buffer contents after presenting.

    swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD;

    // Don't set the advanced flags.

    swapChainDesc.Flags = 0;