dxutil.cpp

VC游戏编程基础

HRESULT DXUtil_WriteGuidRegKey( HKEY hKey, LPCTSTR strRegName, GUID guidValue )
{
    if( ERROR_SUCCESS != RegSetValueEx( hKey, strRegName, 0, REG_BINARY, 
                                        (BYTE*)&guidValue, sizeof(GUID) ) )
        return E_FAIL;

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_Timer()
// Desc: Performs timer opertations. Use the following commands:
//          TIMER_RESET           - to reset the timer
//          TIMER_START           - to start the timer
//          TIMER_STOP            - to stop (or pause) the timer
//          TIMER_ADVANCE         - to advance the timer by 0.1 seconds
//          TIMER_GETABSOLUTETIME - to get the absolute system time
//          TIMER_GETAPPTIME      - to get the current time
//          TIMER_GETELAPSEDTIME  - to get the time that elapsed between 
//                                  TIMER_GETELAPSEDTIME calls
//-----------------------------------------------------------------------------
FLOAT __stdcall DXUtil_Timer( TIMER_COMMAND command )
{
    static BOOL     m_bTimerInitialized = FALSE;
    static BOOL     m_bUsingQPF         = FALSE;
    static BOOL     m_bTimerStopped     = TRUE;
    static LONGLONG m_llQPFTicksPerSec  = 0;

    // Initialize the timer
    if( FALSE == m_bTimerInitialized )
    {
        m_bTimerInitialized = TRUE;

        // Use QueryPerformanceFrequency() to get frequency of timer.  If QPF is
        // not supported, we will timeGetTime() which returns milliseconds.
        LARGE_INTEGER qwTicksPerSec;
        m_bUsingQPF = QueryPerformanceFrequency( &qwTicksPerSec );
        if( m_bUsingQPF )
            m_llQPFTicksPerSec = qwTicksPerSec.QuadPart;
    }

    if( m_bUsingQPF )
    {
        static LONGLONG m_llStopTime        = 0;
        static LONGLONG m_llLastElapsedTime = 0;
        static LONGLONG m_llBaseTime        = 0;
        double fTime;
        double fElapsedTime;
        LARGE_INTEGER qwTime;
        
        // Get either the current time or the stop time, depending
        // on whether we're stopped and what command was sent
        if( m_llStopTime != 0 && command != TIMER_START && command != TIMER_GETABSOLUTETIME)
            qwTime.QuadPart = m_llStopTime;
        else
            QueryPerformanceCounter( &qwTime );

        // Return the elapsed time
        if( command == TIMER_GETELAPSEDTIME )
        {
            fElapsedTime = (double) ( qwTime.QuadPart - m_llLastElapsedTime ) / (double) m_llQPFTicksPerSec;
            m_llLastElapsedTime = qwTime.QuadPart;
            return (FLOAT) fElapsedTime;
        }
    
        // Return the current time
        if( command == TIMER_GETAPPTIME )
        {
            double fAppTime = (double) ( qwTime.QuadPart - m_llBaseTime ) / (double) m_llQPFTicksPerSec;
            return (FLOAT) fAppTime;
        }
    
        // Reset the timer
        if( command == TIMER_RESET )
        {
            m_llBaseTime        = qwTime.QuadPart;
            m_llLastElapsedTime = qwTime.QuadPart;
            m_llStopTime        = 0;
            m_bTimerStopped     = FALSE;
            return 0.0f;
        }
    
        // Start the timer
        if( command == TIMER_START )
        {
            if( m_bTimerStopped )
                m_llBaseTime += qwTime.QuadPart - m_llStopTime;
            m_llStopTime = 0;
            m_llLastElapsedTime = qwTime.QuadPart;
            m_bTimerStopped = FALSE;
            return 0.0f;
        }
    
        // Stop the timer
        if( command == TIMER_STOP )
        {
            if( !m_bTimerStopped )
            {
                m_llStopTime = qwTime.QuadPart;
                m_llLastElapsedTime = qwTime.QuadPart;
                m_bTimerStopped = TRUE;
            }
            return 0.0f;
        }
    
        // Advance the timer by 1/10th second
        if( command == TIMER_ADVANCE )
        {
            m_llStopTime += m_llQPFTicksPerSec/10;
            return 0.0f;
        }

        if( command == TIMER_GETABSOLUTETIME )
        {
            fTime = qwTime.QuadPart / (double) m_llQPFTicksPerSec;
            return (FLOAT) fTime;
        }

        return -1.0f; // Invalid command specified
    }
    else
    {
        // Get the time using timeGetTime()
        static double m_fLastElapsedTime  = 0.0;
        static double m_fBaseTime         = 0.0;
        static double m_fStopTime         = 0.0;
        double fTime;
        double fElapsedTime;
        
        // Get either the current time or the stop time, depending
        // on whether we're stopped and what command was sent
        if( m_fStopTime != 0.0 && command != TIMER_START && command != TIMER_GETABSOLUTETIME)
            fTime = m_fStopTime;
        else
            fTime = GETTIMESTAMP() * 0.001;
    
        // Return the elapsed time
        if( command == TIMER_GETELAPSEDTIME )
        {   
            fElapsedTime = (double) (fTime - m_fLastElapsedTime);
            m_fLastElapsedTime = fTime;
            return (FLOAT) fElapsedTime;
        }
    
        // Return the current time
        if( command == TIMER_GETAPPTIME )
        {
            return (FLOAT) (fTime - m_fBaseTime);
        }
    
        // Reset the timer
        if( command == TIMER_RESET )
        {
            m_fBaseTime         = fTime;
            m_fLastElapsedTime  = fTime;
            m_fStopTime         = 0;
            m_bTimerStopped     = FALSE;
            return 0.0f;
        }
    
        // Start the timer
        if( command == TIMER_START )
        {
            if( m_bTimerStopped )
                m_fBaseTime += fTime - m_fStopTime;
            m_fStopTime = 0.0f;
            m_fLastElapsedTime  = fTime;
            m_bTimerStopped = FALSE;
            return 0.0f;
        }
    
        // Stop the timer
        if( command == TIMER_STOP )
        {
            if( !m_bTimerStopped )
            {
                m_fStopTime = fTime;
                m_fLastElapsedTime  = fTime;
                m_bTimerStopped = TRUE;
            }
            return 0.0f;
        }
    
        // Advance the timer by 1/10th second
        if( command == TIMER_ADVANCE )
        {
            m_fStopTime += 0.1f;
            return 0.0f;
        }

        if( command == TIMER_GETABSOLUTETIME )
        {
            return (FLOAT) fTime;
        }

        return -1.0f; // Invalid command specified
    }
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ConvertAnsiStringToWideCch()
// Desc: This is a UNICODE conversion utility to convert a CHAR string into a
//       WCHAR string. 
//       cchDestChar is the size in TCHARs of wstrDestination.  Be careful not to 
//       pass in sizeof(strDest) 
//-----------------------------------------------------------------------------
HRESULT DXUtil_ConvertAnsiStringToWideCch( WCHAR* wstrDestination, const CHAR* strSource, 
                                     int cchDestChar )
{
    if( wstrDestination==NULL || strSource==NULL || cchDestChar < 1 )
        return E_INVALIDARG;

    int nResult = MultiByteToWideChar( CP_ACP, 0, strSource, -1, 
                                       wstrDestination, cchDestChar );
    wstrDestination[cchDestChar-1] = 0;
    
    if( nResult == 0 )
        return E_FAIL;
    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ConvertWideStringToAnsi()
// Desc: This is a UNICODE conversion utility to convert a WCHAR string into a
//       CHAR string. 
//       cchDestChar is the size in TCHARs of strDestination
//-----------------------------------------------------------------------------
HRESULT DXUtil_ConvertWideStringToAnsiCch( CHAR* strDestination, const WCHAR* wstrSource, 
                                     int cchDestChar )
{
    if( strDestination==NULL || wstrSource==NULL || cchDestChar < 1 )
        return E_INVALIDARG;

    int nResult = WideCharToMultiByte( CP_ACP, 0, wstrSource, -1, strDestination, 
                                       cchDestChar*sizeof(CHAR), NULL, NULL );
    strDestination[cchDestChar-1] = 0;
    
    if( nResult == 0 )
        return E_FAIL;
    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ConvertGenericStringToAnsi()
// Desc: This is a UNICODE conversion utility to convert a TCHAR string into a
//       CHAR string. 
//       cchDestChar is the size in TCHARs of strDestination
//-----------------------------------------------------------------------------
HRESULT DXUtil_ConvertGenericStringToAnsiCch( CHAR* strDestination, const TCHAR* tstrSource, 
                                           int cchDestChar )
{
    if( strDestination==NULL || tstrSource==NULL || cchDestChar < 1 )
        return E_INVALIDARG;

#ifdef _UNICODE
    return DXUtil_ConvertWideStringToAnsiCch( strDestination, tstrSource, cchDestChar );
#else
    strncpy( strDestination, tstrSource, cchDestChar );
    strDestination[cchDestChar-1] = '\0';
    return S_OK;
#endif   
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ConvertGenericStringToWide()
// Desc: This is a UNICODE conversion utility to convert a TCHAR string into a
//       WCHAR string. 
//       cchDestChar is the size in TCHARs of wstrDestination.  Be careful not to 
//       pass in sizeof(strDest) 
//-----------------------------------------------------------------------------
HRESULT DXUtil_ConvertGenericStringToWideCch( WCHAR* wstrDestination, const TCHAR* tstrSource, 
                                           int cchDestChar )
{
    if( wstrDestination==NULL || tstrSource==NULL || cchDestChar < 1 )
        return E_INVALIDARG;

#ifdef _UNICODE
    wcsncpy( wstrDestination, tstrSource, cchDestChar );
    wstrDestination[cchDestChar-1] = L'\0';
    return S_OK;
#else
    return DXUtil_ConvertAnsiStringToWideCch( wstrDestination, tstrSource, cchDestChar );
#endif    
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ConvertAnsiStringToGeneric()
// Desc: This is a UNICODE conversion utility to convert a CHAR string into a
//       TCHAR string. 
//       cchDestChar is the size in TCHARs of tstrDestination.  Be careful not to 
//       pass in sizeof(strDest) on UNICODE builds
//-----------------------------------------------------------------------------
HRESULT DXUtil_ConvertAnsiStringToGenericCch( TCHAR* tstrDestination, const CHAR* strSource, 
                                           int cchDestChar )
{
    if( tstrDestination==NULL || strSource==NULL || cchDestChar < 1 )
        return E_INVALIDARG;
        
#ifdef _UNICODE
    return DXUtil_ConvertAnsiStringToWideCch( tstrDestination, strSource, cchDestChar );
#else
    strncpy( tstrDestination, strSource, cchDestChar );
    tstrDestination[cchDestChar-1] = '\0';
    return S_OK;
#endif    
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ConvertAnsiStringToGeneric()
// Desc: This is a UNICODE conversion utility to convert a WCHAR string into a
//       TCHAR string. 
//       cchDestChar is the size in TCHARs of tstrDestination.  Be careful not to 
//       pass in sizeof(strDest) on UNICODE builds
//-----------------------------------------------------------------------------
HRESULT DXUtil_ConvertWideStringToGenericCch( TCHAR* tstrDestination, const WCHAR* wstrSource, 
                                           int cchDestChar )
{
    if( tstrDestination==NULL || wstrSource==NULL || cchDestChar < 1 )
        return E_INVALIDARG;

#ifdef _UNICODE
    wcsncpy( tstrDestination, wstrSource, cchDestChar );
    tstrDestination[cchDestChar-1] = L'\0';    
    return S_OK;
#else
    return DXUtil_ConvertWideStringToAnsiCch( tstrDestination, wstrSource, cchDestChar );
#endif
}




//-----------------------------------------------------------------------------
// Name: DXUtil_LaunchReadme()
// Desc: Finds and opens the readme for this sample
//-----------------------------------------------------------------------------
VOID DXUtil_LaunchReadme( HWND hWnd, LPCTSTR strLoc )
{
#ifdef UNDER_CE
    // This is not available on PocketPC
    MessageBox( hWnd, TEXT("For operating instructions, please open the ")
                      TEXT("readme.txt file included with the project."),
                TEXT("DirectX SDK Sample"), MB_ICONWARNING | MB_OK );

    return;
#endif

    const int NUM_FILENAMES = 2;
    LPCTSTR strFilenames[] = 
    {
        TEXT("readme.htm"),
        TEXT("readme.txt")
    };

    TCHAR strReadmePath[1024];
    TCHAR strExeName[MAX_PATH];
    TCHAR strExePath[MAX_PATH];
    TCHAR strSamplePath[MAX_PATH];
    TCHAR* strLastSlash = NULL;

    for( int i=0; i < NUM_FILENAMES; i++ )
    {
        LPCTSTR strFilename = strFilenames[i];
        bool bSuccess = false;
        bool bFound = false;
        
        lstrcpy( strReadmePath, TEXT("") );
        lstrcpy( strExePath, TEXT("") );
        lstrcpy( strExeName, TEXT("") );
        lstrcpy( strSamplePath, TEXT("") );

        // If the user provided a location for the readme, check there first.
        if( strLoc )
        {
            HKEY  hKey;
            LONG lResult = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
                                        _T("Software\\Microsoft\\DirectX SDK"),
                                        0, KEY_READ, &hKey );
            if( ERROR_SUCCESS == lResult )
            {
                DWORD dwType;
                DWORD dwSize = MAX_PATH * sizeof(TCHAR);
                lResult = RegQueryValueEx( hKey, _T("DX9J3SDK Samples Path"), NULL,
                                        &dwType, (BYTE*)strSamplePath, &dwSize );
                strSamplePath[MAX_PATH-1] = 0; // RegQueryValueEx doesn't NULL term if buffer too small
                
                if( ERROR_SUCCESS == lResult )
                {
                    _sntprintf( strReadmePath, 1023, TEXT("%s\\C++\\%s\\%s"), 
                                strSamplePath, strLoc, strFilename );
                    strReadmePath[1023] = 0;

                    if( GetFileAttributes( strReadmePath ) != 0xFFFFFFFF )
                        bFound = TRUE;
                }
            }

            RegCloseKey( hKey );
        }

        // Get the exe name, and exe path
        GetModuleFileName( NULL, strExePath, MAX_PATH );
        strExePath[MAX_PATH-1]=0;

        strLastSlash = _tcsrchr( strExePath, TEXT('\\') );
        if( strLastSlash )
        {
            _tcsncpy( strExeName, &strLastSlash[1], MAX_PATH );
            strExeName[MAX_PATH-1]=0;

            // Chop the exe name from the exe path
            *strLastSlash = 0;

            // Chop the .exe from the exe name