DX中自带几何体的绘制：
为了方便，DX为我们提供了几种自带的几何体，我们就不需要定义成吨的顶点来绘制一个图形了。
常用的有几种，立方体，茶壶，柱体，球面体。
HRESULT D3DXCreateTeapot( __in LPDIRECT3DDEVICE9 pDevice, __out LPD3DXMESH *ppMesh, __out LPD3DXBUFFER *ppAdjacency);
上面是其中最简单的创建一个茶壶的代码，其余立方体与这个的创建大同小异，仅仅是在第一个参数之后加上几个尺寸的参数。
例如，我们创建一个立方体：
//生成立方体D3DXCreateBox(g_pDevice,//设备对象1.0f, 1.0f, 1.0f,//X，Y，Z方向的长度&g_pbox,//创建的对象的指针NULL//存储绘制网格的三角形索引参数，不使用，置为NULL);
在绘制时也很简单，只需要一句代码即可绘制：
g_pbox->DrawSubset(0);一个Demo：
创建了一个立方体和一个茶壶，分别绕X轴旋转和Y轴旋转：
// D3DDemo.cpp : 定义应用程序的入口点。//#include "stdafx.h"#include "D3DDemo.h"#define MAX_LOADSTRING 100// 全局变量:HINSTANCE hInst;// 当前实例TCHAR szTitle[MAX_LOADSTRING];// 标题栏文本TCHAR szWindowClass[MAX_LOADSTRING];// 主窗口类名// 此代码模块中包含的函数的前向声明:HWNDg_hWnd;ATOMMyRegisterClass(HINSTANCE hInstance);BOOLInitInstance(HINSTANCE, int);LRESULT CALLBACKWndProc(HWND, UINT, WPARAM, LPARAM);//———改造3D窗口需要的内容————LPDIRECT3D9 g_pD3D = NULL; //D3D接口指针LPDIRECT3DDEVICE9 g_pDevice = NULL;//D3D设备指针//立方体的接口LPD3DXMESH g_pteapot = NULL;LPD3DXMESH g_pbox = NULL;void onCreatD3D(){g_pD3D = Direct3DCreate9(D3D_SDK_VERSION);if (!g_pD3D)return;//检测硬件设备能力的方法/*D3DCAPS9 caps;ZeroMemory(&caps, sizeof(caps));g_pD3D->GetDeviceCaps(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, &caps);*///获得相关信息，屏幕大小，像素点属性D3DDISPLAYMODE d3ddm;ZeroMemory(&d3ddm, sizeof(d3ddm));g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &d3ddm);//设置全屏模式D3DPRESENT_PARAMETERS d3dpp;ZeroMemory(&d3dpp, sizeof(d3dpp));/*d3dpp.Windowed = false;d3dpp.BackBufferWidth = d3ddm.Width;d3dpp.BackBufferHeight = d3ddm.Height;*/d3dpp.Windowed = true;d3dpp.BackBufferFormat = d3ddm.Format;d3dpp.BackBufferCount = 1;d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD;//交换后原缓冲区数据丢弃//是否开启自动深度模板缓冲d3dpp.EnableAutoDepthStencil = true;//当前自动深度模板缓冲的格式d3dpp.AutoDepthStencilFormat = D3DFMT_D16;//每个像素点有16位的存储空间，存储离摄像机的距离g_pD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, g_hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING, &d3dpp, &g_pDevice);if (!g_pDevice)return;//设置渲染状态，设置启用深度值g_pDevice->SetRenderState(D3DRS_ZENABLE, true);//设置渲染状态，关闭灯光g_pDevice->SetRenderState(D3DRS_LIGHTING, false);//设置渲染状态，裁剪模式g_pDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE);//g_pDevice->SetRenderState(D3DRS_CULLMODE, D3DCULL_NONE) ;}void Transform(){//ViewTransform：取景变换D3DXVECTOR3 vEyePt(0.0f, 0.0f, -10.0f);//摄像机世界坐标D3DXVECTOR3 vLookatPt(0.0f, 0.0f, 0.0f);//观察点世界坐标D3DXVECTOR3 vUpVec(0.0f, 1.0f, 0.0f);//摄像机的上向量，通常为（0.0f, 1.0f, 0.0f）D3DXMATRIXA16 matView;//View变换的矩阵//根据上面的结果计算出矩阵，存入矩阵中D3DXMatrixLookAtLH(&matView, &vEyePt, &vLookatPt, &vUpVec);//进行取景变换g_pDevice->SetTransform(D3DTS_VIEW, &matView);//ProjectionTransform：投影变换D3DXMATRIXA16 matProj;//投影变换矩阵//生成投影变换矩阵，存入上面的矩阵中D3DXMatrixPerspectiveFovLH(&matProj,//输出结果矩阵D3DX_PI / 4, //视域角度，一般为PI/41.0f, //显示屏的长宽比1.0f, //视截体中近截面距离摄像机的位置100.0f //视截体中远截面距离摄像机的位置);//进行投影变换g_pDevice->SetTransform(D3DTS_PROJECTION, &matProj);}void onInit(){//初始化D3DonCreatD3D();//初始化对象//生成茶壶D3DXCreateTeapot(g_pDevice,//设备对象&g_pteapot,//创建的对象的指针NULL//通常为NULL);//生成立方体D3DXCreateBox(g_pDevice,//设备对象1.0f, 1.0f, 1.0f,//X，Y，Z方向的长度&g_pbox,//创建的对象的指针NULL//存储绘制网格的三角形索引参数，不使用，置为NULL);}void onDestroy(){if (!g_pDevice)g_pDevice->Release();g_pDevice = NULL;}void onLogic(float fElapsedTime){}void onRender(float fElasedTime){//前两个参数是0和NULL时，清空整个游戏窗口的内容（清的是后台）//第三个是清除的对象：前面表示清除颜色缓冲区，后面表示清除深度缓冲区,D3DCLEAR_STENCIL清空模板缓冲区g_pDevice->Clear(0, NULL, D3DCLEAR_TARGET|D3DCLEAR_ZBUFFER, D3DCOLOR_XRGB(0,100,100), 1.0f, 0);g_pDevice->BeginScene();Transform();D3DXMATRIXA16 matTY, matTX;D3DXMatrixRotationY(&matTY, timeGetTime() / 720.0f);D3DXMatrixRotationX(&matTX, timeGetTime() / 720.0f);//绘制茶壶D3DXMATRIXA16 matTeapot;D3DXMatrixTranslation(&matTeapot, 0.0f, 0.0f, 0.0f);matTeapot = matTeapot * matTY;g_pDevice->SetTransform(D3DTS_WORLD, &matTeapot);g_pteapot->DrawSubset(0);//绘制立方体D3DXMATRIXA16 matBox;D3DXMatrixTranslation(&matBox, 1.0f, 1.0f, 0.0f);matBox = matBox * matTX;g_pDevice->SetTransform(D3DTS_WORLD, &matBox);g_pbox->DrawSubset(0);//设置渲染状态为线框填充g_pDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);g_pDevice->EndScene();g_pDevice->Present(NULL, NULL, NULL, NULL);}int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,_In_opt_ HINSTANCE hPrevInstance,_In_ LPTSTR lpCmdLine,_In_ intnCmdShow){UNREFERENCED_PARAMETER(hPrevInstance);UNREFERENCED_PARAMETER(lpCmdLine); // TODO: 在此放置代码。MSG msg;HACCEL hAccelTable;// 初始化全局字符串LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);LoadString(hInstance, IDC_D3DDEMO, szWindowClass, MAX_LOADSTRING);MyRegisterClass(hInstance);// 执行应用程序初始化:if (!InitInstance (hInstance, nCmdShow)){return FALSE;}hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_D3DDEMO));ZeroMemory(&msg, sizeof(msg));while (msg.message != WM_QUIT){if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)){TranslateMessage(&msg);DispatchMessage(&msg);}else{static DWORD dwTime = timeGetTime();DWORD dwCurrentTime = timeGetTime();DWORD dwElapsedTime = dwCurrentTime – dwTime;float fElapsedTime = dwElapsedTime * 0.001f;//————渲染和逻辑部分代码———-onLogic(fElapsedTime);onRender(fElapsedTime);//—————————————–if (dwElapsedTime < 1000 / 60){Sleep(1000/ 60 – dwElapsedTime);}dwTime = dwCurrentTime;}}onDestroy();return (int) msg.wParam;}//// 函数: MyRegisterClass()//// 目的: 注册窗口类。//ATOM MyRegisterClass(HINSTANCE hInstance){WNDCLASSEX wcex;wcex.cbSize = sizeof(WNDCLASSEX);wcex.style= CS_HREDRAW | CS_VREDRAW;wcex.lpfnWndProc= WndProc;wcex.cbClsExtra= 0;wcex.cbWndExtra= 0;wcex.hInstance= hInstance;wcex.hIcon= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_D3DDEMO));wcex.hCursor= LoadCursor(NULL, IDC_ARROW);wcex.hbrBackground= (HBRUSH)(COLOR_WINDOW+1);wcex.lpszMenuName= MAKEINTRESOURCE(IDC_D3DDEMO);wcex.lpszClassName= szWindowClass;wcex.hIconSm= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));return RegisterClassEx(&wcex);}//// 函数: InitInstance(HINSTANCE, int)//// 目的: 保存实例句柄并创建主窗口//// 注释:////在此函数中，我们在全局变量中保存实例句柄并//创建和显示主程序窗口。//BOOL InitInstance(HINSTANCE hInstance, int nCmdShow){hInst = hInstance; // 将实例句柄存储在全局变量中g_hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);if (!g_hWnd) {return FALSE; }SetMenu(g_hWnd, NULL); ShowWindow(g_hWnd, nCmdShow); UpdateWindow(g_hWnd);onInit();return TRUE;}//// 函数: WndProc(HWND, UINT, WPARAM, LPARAM)//// 目的: 处理主窗口的消息。//// WM_COMMAND- 处理应用程序菜单// WM_PAINT- 绘制主窗口// WM_DESTROY- 发送退出消息并返回////LRESULT CALLBACK WndProc(HWND g_hWnd, UINT message, WPARAM wParam, LPARAM lParam){switch (message){case WM_KEYDOWN:if (wParam == VK_ESCAPE)PostQuitMessage(0);break;case WM_CLOSE:DestroyWindow(g_hWnd);break;case WM_DESTROY:PostQuitMessage(0);break;default:return DefWindowProc(g_hWnd, message, wParam, lParam);}return 0;}
失败是什么?没有什么.只是更走近成功一步,
