学步园

 1: 获取IDirect3D9接口,主要用来查找物理硬件设备信息,和创建IDirect3DDevice9接口.代码如下:

       IDirect3D9* pD3D = Direct3DCreate9(D3D_SDK_VERSION);

2: 验证硬件支持的显示模式,在 a shader approach 一书中,在窗口下使用当前显示模式作为显示格式和后台缓存格式,在全屏模式下使用D3DFMT_X8R8G8B8作为显示格式后台缓存格式.代码如下:

D3DDISPLAYMODE mode;

pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT,&mode);

//检查窗口模式

pD3D->CheckDeviceTyte(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,mode.Format,mode.Format,true);

//检查全屏模式

pd3d->CheckDeviceType(D3DADAPTER_DEFAULT, mDevType, D3DFMT_X8R8G8B8, D3DFMT_X8R8G8B8, false)

3: 检查硬件支持的顶点运算.如硬件顶点处理(hardware vertex processing)和(pure device),代码如下:

D3DCPAS9 cpas;

pD3D->GetDeviceCaps(D3DADAPTER_DEFAULT,D3DDEVTYPE_HAL,&caps);

if(cpas.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT)

       vp = D3DCREATE_HARDWARE_VERTEXPROCESSING;

else

       vp = D3DCREATE_SOFTWARE_VERTEXPROCESSING;

if(cpas.DevCaps & D3DDEVCAPS_PUREDEVICE && cpas.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT)

       vp |= D3DCREATE_PUREDEVICE;

4:初始化D3DPRESENT_PARAMETERS结构实例,该实例结构主要用来详细描述将要创建的IDirect3DDevice9接口.结构如下:

typedef struct _D3DPRESENT_PARAMETERS_ {

    UINT      BackBufferWidth;

    UINT      BackBufferHeight;

    D3DFORMAT BackBufferFormat;

    UINT      BackBufferCount;

    D3DMULTISAMPLE_TYPE MultiSampleType;

    DWORD     MultiSampleQuality;

    D3DSWAPEFFECT SwapEffect;

    HWND      hDeviceWindow;

    BOOL      Windowed;

    BOOL      EnableAutoDepthStencil;

    D3DFORMAT AutoDepthStencilFormat;

    DWORD     Flags;

    UINT      FullScreen_RefreshRateInHz;

    UINT      PresentationInterval;

} D3DPRESENT_PARAMETERS;

BackBufferWidth和BackBufferHeight: 描述后台缓存的宽高(以象素为单位)

BackBufferFormat:后台缓存的格式.一般设置为D3DFMT_UNKNOW

BackBufferCount:后台缓存的数量

MultiSampleType,MultiSampleQuality:多重采样,用于反走样和搞锯齿.

SwapEffect:后台缓存的换页方式,一般使用D3DSWAPEFFECT_DISCARD.

hDeviceWindow:和设备相关的窗口句柄,

Windowed: 应用程序是否窗口化

EnableAutoDepthStencil: 是否使用自动深度和模板缓存管理,一般设置为true;

AutoDepthStencilFormat:深度和模板缓存格式

Flags:一些附加的特性描述:一般设置为0;

FullScreen_RefreshRate:刷新频率:一般设置为D3DPRESENT_RATE_DEFAULT

PresentationInterval:后台缓存提交方式,一般设置为D3DPRESENT_INTERVAL_IMMEDIATE

表示立刻提交.

5:创建IDirect3DDevice9设备接口对象,代码如下:

pd3d->CreateDevice(

              D3DADAPTER_DEFAULT,    //主显卡

              D3DDEVTYPE_HAL,         // 设备类型

              mhMainWnd,                      //窗口句柄

              Vp,                                          //顶点处理方式

           &d3dPP,                    // D3DPRESENT_PARAMETERS参数

           &pDevice));                          // 返回创建的IDirect3DDevice9设备接口对象oid D3DApp::initDirect3D()<br /> {<br /> // Step 1: Create the IDirect3D9 object.</p> <p> md3dObject = Direct3DCreate9(D3D_SDK_VERSION);<br /> if( !md3dObject )<br /> {<br /> MessageBox(0, "Direct3DCreate9 FAILED", 0, 0);<br /> PostQuitMessage(0);<br /> }</p> <p> // Step 2: Verify hardware support for specified formats in windowed and full screen modes.</p> <p> D3DDISPLAYMODE mode;<br /> md3dObject->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &mode);<br /> HR(md3dObject->CheckDeviceType(D3DADAPTER_DEFAULT, mDevType, mode.Format, mode.Format, true));<br /> HR(md3dObject->CheckDeviceType(D3DADAPTER_DEFAULT, mDevType, D3DFMT_X8R8G8B8, D3DFMT_X8R8G8B8, false));</p> <p> // Step 3: Check for requested vertex processing and pure device.</p> <p> D3DCAPS9 caps;<br /> HR(md3dObject->GetDeviceCaps(D3DADAPTER_DEFAULT, mDevType, &caps));</p> <p> DWORD devBehaviorFlags = 0;<br /> if( caps.DevCaps & D3DDEVCAPS_HWTRANSFORMANDLIGHT )<br /> devBehaviorFlags |= mRequestedVP;<br /> else<br /> devBehaviorFlags |= D3DCREATE_SOFTWARE_VERTEXPROCESSING;</p> <p> // If pure device and HW T&L supported<br /> if( caps.DevCaps & D3DDEVCAPS_PUREDEVICE &&<br /> devBehaviorFlags & D3DCREATE_HARDWARE_VERTEXPROCESSING)<br /> devBehaviorFlags |= D3DCREATE_PUREDEVICE;</p> <p> // Step 4: Fill out the D3DPRESENT_PARAMETERS structure.</p> <p> md3dPP.BackBufferWidth = 0;<br /> md3dPP.BackBufferHeight = 0;<br /> md3dPP.BackBufferFormat = D3DFMT_UNKNOWN;<br /> md3dPP.BackBufferCount = 1;<br /> md3dPP.MultiSampleType = D3DMULTISAMPLE_NONE;<br /> md3dPP.MultiSampleQuality = 0;<br /> md3dPP.SwapEffect = D3DSWAPEFFECT_DISCARD;<br /> md3dPP.hDeviceWindow = mhMainWnd;<br /> md3dPP.Windowed = true;<br /> md3dPP.EnableAutoDepthStencil = true;<br /> md3dPP.AutoDepthStencilFormat = D3DFMT_D24S8;<br /> md3dPP.Flags = 0;<br /> md3dPP.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;<br /> md3dPP.PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;</p> <p> // Step 5: Create the device.</p> <p> HR(md3dObject->CreateDevice(<br /> D3DADAPTER_DEFAULT, // primary adapter<br /> mDevType, // device type<br /> mhMainWnd, // window associated with device<br /> devBehaviorFlags, // vertex processing<br /> &md3dPP, // present parameters<br /> &gd3dDevice)); // return created device<br /> }