Lesson 13: SDK文档：Tutorial 1 Direct3D 11 Basics分析

头文件：

#include <windows.h>
#include <d3d11.h>
#include <d3dx11.h>
#include "resource.h"

全局变量声明：

// Global Variables
HINSTANCE               g_hInst = NULL; //实例句柄
HWND                    g_hWnd = NULL;  //窗口句柄
D3D_DRIVER_TYPE         g_driverType = D3D_DRIVER_TYPE_NULL;    //驱动类型
D3D_FEATURE_LEVEL       g_featureLevel = D3D_FEATURE_LEVEL_11_0;    //特征等级
ID3D11Device*           g_pd3dDevice = NULL;    //设备接口指针
ID3D11DeviceContext*    g_pImmediateContext = NULL; //设备上下文接口指针
IDXGISwapChain*         g_pSwapChain = NULL;    //交换链接口指针
ID3D11RenderTargetView* g_pRenderTargetView = NULL; //渲染目标视图接口指针

函数声明：

// Forward declarations
HRESULT InitWindow( HINSTANCE hInstance, int nCmdShow );    //窗口初始化函数
HRESULT InitDevice();   //设备初始化函数
void CleanupDevice();   //清除设备函数
LRESULT CALLBACK    WndProc( HWND, UINT, WPARAM, LPARAM );  //窗口过程函数
void Render();  //渲染函数

程序入口点函数：

int WINAPI wWinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow )
{
    UNREFERENCED_PARAMETER( hPrevInstance );
    UNREFERENCED_PARAMETER( lpCmdLine );

    // 窗口初始化
    if( FAILED( InitWindow( hInstance, nCmdShow ) ) )
        return 0;

    // 设备初始化
    if( FAILED( InitDevice() ) )
    {
        CleanupDevice();
        return 0;
    }

    // 消息主循环
    // Main message loop
    MSG msg = {
  0};
    while( WM_QUIT != msg.message )