dxut.cpp

游戏编程精粹6的光盘源代码

    WCHAR wszPath[MAX_PATH+1];
    if( GetSystemDirectory( wszPath, MAX_PATH+1 ) )
    {
        StringCchCat( wszPath, MAX_PATH, L"\\winmm.dll" );
        HINSTANCE hInstWinMM = LoadLibrary( wszPath );
        if( hInstWinMM ) 
        {
            LPTIMEBEGINPERIOD pTimeBeginPeriod = (LPTIMEBEGINPERIOD)GetProcAddress( hInstWinMM, "timeBeginPeriod" );
            if( NULL != pTimeBeginPeriod )
                pTimeBeginPeriod(1);

            FreeLibrary(hInstWinMM);
        }
    }

    GetDXUTState().SetShowMsgBoxOnError( bShowMsgBoxOnError );
    GetDXUTState().SetHandleDefaultHotkeys( bHandleDefaultHotkeys );
    GetDXUTState().SetHandleAltEnter( bHandleAltEnter );

    if( bParseCommandLine )
        DXUTParseCommandLine();

    // Verify D3DX version
    if( !D3DXCheckVersion( D3D_SDK_VERSION, D3DX_SDK_VERSION ) )
    {
        DXUTDisplayErrorMessage( DXUTERR_INCORRECTVERSION );
        return DXUT_ERR( L"D3DXCheckVersion", DXUTERR_INCORRECTVERSION );
    }

    // Create a Direct3D object if one has not already been created
    IDirect3D9* pD3D = DXUTGetD3DObject();
    if( pD3D == NULL )
    {
        // This may fail if DirectX 9 isn't installed
        // This may fail if the DirectX headers are out of sync with the installed DirectX DLLs
        pD3D = DXUT_Dynamic_Direct3DCreate9( D3D_SDK_VERSION );
        GetDXUTState().SetD3D( pD3D );
    }

    if( pD3D == NULL )
    {
        // If still NULL, then something went wrong
        DXUTDisplayErrorMessage( DXUTERR_NODIRECT3D );
        return DXUT_ERR( L"Direct3DCreate9", DXUTERR_NODIRECT3D );
    }

    // Reset the timer
    DXUTGetGlobalTimer()->Reset();

    GetDXUTState().SetDXUTInited( true );

    return S_OK;
}


//--------------------------------------------------------------------------------------
// Parses the command line for parameters.  See DXUTInit() for list 
//--------------------------------------------------------------------------------------
void DXUTParseCommandLine()
{
    WCHAR* strCmdLine = GetCommandLine();

    // Skip past program name (first token in command line).
    if (*strCmdLine == L'"')  // Check for and handle quoted program name
    {
        strCmdLine++;

        // Skip over until another double-quote or a null 
        while (*strCmdLine && (*strCmdLine != L'"'))
            strCmdLine++;

        // Skip over double-quote
        if (*strCmdLine == L'"')            
            strCmdLine++;    
    }
    else   
    {
        // First token wasn't a quote
        while (*strCmdLine > L' ')
            strCmdLine++;
    }

    for(;;)
    {
        // Skip past any white space preceding the next token
        while (*strCmdLine && (*strCmdLine <= L' '))
            strCmdLine++;
        if( *strCmdLine == 0 )
            break;

        WCHAR strFlag[256];
        int nFlagLen = 0;

        // Skip past the flag marker
        if( *strCmdLine == L'/' ||
            *strCmdLine == L'-' )
            strCmdLine++;

        // Compare the first N letters w/o regard to case
        StringCchCopy( strFlag, 256, L"adapter" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            if( DXUTGetCmdParam( strCmdLine, strFlag, nFlagLen ) )
            {
                int nAdapter = _wtoi(strFlag);
                GetDXUTState().SetOverrideAdapterOrdinal( nAdapter );
            }
            continue;
        }

        StringCchCopy( strFlag, 256, L"windowed" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetOverrideWindowed( true );
            strCmdLine += nFlagLen;
            continue;
        }

        StringCchCopy( strFlag, 256, L"fullscreen" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetOverrideFullScreen( true );
            strCmdLine += nFlagLen;
            continue;
        }

        StringCchCopy( strFlag, 256, L"forcehal" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetOverrideForceHAL( true );
            strCmdLine += nFlagLen;
            continue;
        }

        StringCchCopy( strFlag, 256, L"forceref" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetOverrideForceREF( true );
            strCmdLine += nFlagLen;
            continue;
        }

        StringCchCopy( strFlag, 256, L"forcepurehwvp" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetOverrideForcePureHWVP( true );
            strCmdLine += nFlagLen;
            continue;
        }

        StringCchCopy( strFlag, 256, L"forcehwvp" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetOverrideForceHWVP( true );
            strCmdLine += nFlagLen;
            continue;
        }

        StringCchCopy( strFlag, 256, L"forceswvp" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetOverrideForceSWVP( true );
            strCmdLine += nFlagLen;
            continue;
        }

        StringCchCopy( strFlag, 256, L"width" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            if( DXUTGetCmdParam( strCmdLine, strFlag, nFlagLen ) )
            {
                int nWidth = _wtoi(strFlag);
                GetDXUTState().SetOverrideWidth( nWidth );
            }
            continue;
        }

        StringCchCopy( strFlag, 256, L"height" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            if( DXUTGetCmdParam( strCmdLine, strFlag, nFlagLen ) )
            {
                int nHeight = _wtoi(strFlag);
                GetDXUTState().SetOverrideHeight( nHeight );
            }
            continue;
        }

        StringCchCopy( strFlag, 256, L"startx" );
        nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            if( DXUTGetCmdParam( strCmdLine, strFlag, nFlagLen ) )
            {
                int nX = _wtoi(strFlag);
                GetDXUTState().SetOverrideStartX( nX );
            }
            continue;
        }

        StringCchCopy( strFlag, 256, L"starty" );
        nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            if( DXUTGetCmdParam( strCmdLine, strFlag, nFlagLen ) )
            {
                int nY = _wtoi(strFlag);
                GetDXUTState().SetOverrideStartY( nY );
            }
            continue;
        }

        StringCchCopy( strFlag, 256, L"constantframetime" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            float fTimePerFrame;
            if( DXUTGetCmdParam( strCmdLine, strFlag, nFlagLen ) )
                fTimePerFrame = (float)wcstod( strFlag, NULL );
            else
                fTimePerFrame = 0.0333f;
            GetDXUTState().SetOverrideConstantFrameTime( true );
            GetDXUTState().SetOverrideConstantTimePerFrame( fTimePerFrame );
            DXUTSetConstantFrameTime( true, fTimePerFrame );
            continue;
        }

        StringCchCopy( strFlag, 256, L"quitafterframe" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            if( DXUTGetCmdParam( strCmdLine, strFlag, nFlagLen ) )
            {
                int nFrame = _wtoi(strFlag);
                GetDXUTState().SetOverrideQuitAfterFrame( nFrame );
            }
            continue;
        }      
        
        StringCchCopy( strFlag, 256, L"noerrormsgboxes" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetShowMsgBoxOnError( false );
            strCmdLine += nFlagLen;
            continue;
        }        

        StringCchCopy( strFlag, 256, L"automation" ); nFlagLen = (int) wcslen(strFlag);
        if( _wcsnicmp( strCmdLine, strFlag, nFlagLen ) == 0 )
        {
            GetDXUTState().SetAutomation( true );
            strCmdLine += nFlagLen;
            continue;
        }

        // Unrecognized flag
        StringCchCopy( strFlag, 256, strCmdLine ); 
        WCHAR* strSpace = strFlag;
        while (*strSpace && (*strSpace > L' '))
            strSpace++;
        *strSpace = 0;