初始化Direct3D的基本步骤：
1.获取一个IDirect3D9接口指针。
2.检查设备的技术特性（D3DCAPS9）,搞清楚主显示卡是否支持硬件顶点处理。
3.初始化一个D3DPRESENT_PARAMETERS结构实例，这个结构包含了许多数据成员，它们允许我们指定将要创建的IDirect3DDevice9接口的特性。
4.创建一个基于已经初始化好的D3DPRESENT_PARAMETERS结构的IDirect3DDevice9对象。
代码如下：
// Step 1:获取d3d接口
IDirect3D9* d3d9 = 0; d3d9 = Direct3DCreate9(D3D_SDK_VERSION);
if( !d3d9 ) { ::MessageBox(0, "Direct3DCreate9() - FAILED", 0, 0); return false; }
// Step 2:检测硬件处理能力
D3DCAPS9 caps; d3d9->GetDeviceCaps(D3DADAPTER_DEFAULT, deviceType, &caps);
int vp = 0; if( caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT ) vp = D3DCREATE_HARDWARE_VERTEXPROCESSING; else vp = D3DCREATE_SOFTWARE_VERTEXPROCESSING;
// Step 3:填充d3dpresent_parameters结构 D3DPRESENT_PARAMETERS d3dpp; d3dpp.BackBufferWidth = width; d3dpp.BackBufferHeight = height; d3dpp.BackBufferFormat = D3DFMT_A8R8G8B8; d3dpp.BackBufferCount = 1; d3dpp.MultiSampleType = D3DMULTISAMPLE_NONE; d3dpp.MultiSampleQuality = 0; d3dpp.SwapEffect = D3DSWAPEFFECT_DISCARD; d3dpp.hDeviceWindow = hwnd; d3dpp.Windowed = windowed; d3dpp.EnableAutoDepthStencil = true; d3dpp.AutoDepthStencilFormat = D3DFMT_D24S8; d3dpp.Flags = 0; d3dpp.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT; d3dpp.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
// 4 创建设备
hr = d3d9->CreateDevice( D3DADAPTER_DEFAULT, // primary adapter deviceType, // device type hwnd, // window associated with device vp, // vertex processing &d3dpp, // present parameters device); // return created device
