D3D11设备接口的动态创建方法

在微软的例子中,提供了一种动态创建ID3D11Device接口指针的方法,发在这里,供大家参考.该方法的优势就是可以方便的判定系统中是否支持D3D11,并且针对可能的情况,通过MessageBox的方法,给出了可能的解决方案:

HRESULT WINAPI Dynamic_D3D11CreateDevice( IDXGIAdapter* pAdapter,
                                          D3D_DRIVER_TYPE DriverType,
                                          HMODULE Software,
                                          UINT32 Flags,
                                          CONST D3D_FEATURE_LEVEL* pFeatureLevels,
                                          UINT FeatureLevels,
                                          UINT32 SDKVersion,
                                          ID3D11Device** ppDevice,
                                          D3D_FEATURE_LEVEL* pFeatureLevel,
                                          ID3D11DeviceContext** ppImmediateContext )
{
    typedef HRESULT (WINAPI * LPD3D11CREATEDEVICE)( IDXGIAdapter*, D3D_DRIVER_TYPE,
        HMODULE, UINT32, CONST D3D_FEATURE_LEVEL*, UINT, UINT32, ID3D11Device**,
        D3D_FEATURE_LEVEL*, ID3D11DeviceContext** );
    static LPD3D11CREATEDEVICE  s_DynamicD3D11CreateDevice = NULL;
    if ( s_DynamicD3D11CreateDevice == NULL )
    {           
        HMODULE hModD3D11 = LoadLibrary( L"d3d11.dll" );

        if ( hModD3D11 == NULL )
        {
            // Ensure this "D3D11 absent" message is shown only once. As sometimes, the app would like to try
            // to create device multiple times
            static bool bMessageAlreadyShwon = false;
           
            if ( !bMessageAlreadyShwon )
            {
                OSVERSIONINFOEX osv;
                memset( &osv, 0, sizeof(osv) );
                osv.dwOSVersionInfoSize = sizeof(osv);
                GetVersionEx( (LPOSVERSIONINFO)&osv );

                if ( ( osv.dwMajorVersion > 6 )
                    || ( osv.dwMajorVersion == 6 && osv.dwMinorVersion >= 1 )
                    || ( osv.dwMajorVersion == 6 && osv.dwMinorVersion == 0 && osv.dwBuildNumber > 6002 ) )
                {

                    MessageBox( 0, L"Direct3D 11 components were not found.", L"Error", MB_ICONEXCLAMATION );
                    // This should not happen, but is here for completeness as the system could be
                    // corrupted or some future OS version could pull D3D11.DLL for some reason
                }
                else if ( osv.dwMajorVersion == 6 && osv.dwMinorVersion == 0 && osv.dwBuildNumber == 6002 )
                {

                    MessageBox( 0, L"Direct3D 11 components were not found, but are available for"\
                        L" this version of Windows.\n"\
                        L"For details see Microsoft Knowledge Base Article #971644\n"\
                        L"http://support.microsoft.com/default.aspx/kb/971644/", L"Error", MB_ICONEXCLAMATION );

                }
                else if ( osv.dwMajorVersion == 6 && osv.dwMinorVersion == 0 )
                {
                    MessageBox( 0, L"Direct3D 11 components were not found. Please install the latest Service Pack.\n"\
                        L"For details see Microsoft Knowledge Base Article #935791\n"\
                        L" http://support.microsoft.com/default.aspx/kb/935791", L"Error", MB_ICONEXCLAMATION );

                }
                else
                {
                    MessageBox( 0, L"Direct3D 11 is not supported on this OS.", L"Error", MB_ICONEXCLAMATION );
                }

                bMessageAlreadyShwon = true;
            }           

            return E_FAIL;
        }

        s_DynamicD3D11CreateDevice = ( LPD3D11CREATEDEVICE )GetProcAddress( hModD3D11, "D3D11CreateDevice" );          
    }

    return s_DynamicD3D11CreateDevice( pAdapter, DriverType, Software, Flags, pFeatureLevels, FeatureLevels, SDKVersion, ppDevice, pFeatureLevel,ppImmediateContext);
}

在使用中使用中利用Dynamic_D3D11CreateDevice方法代替代码中原来的D3D11CreateDevice默认方法即可.

(再次鄙视下这个网易博客的排版系统,RTF文本粘贴居然把格式都丢了,也没有颜色格式了,代码就这样成了黑白......)