//-----------------------------------------------------------------------------
// File: DXUtil.cpp
//
// Desc: Shortcut macros and functions for using DX objects
//
// Copyright (c) Microsoft Corporation. All rights reserved
//-----------------------------------------------------------------------------
#ifndef STRICT
#define STRICT
#endif // !STRICT
#include <windows.h>
#include <mmsystem.h>
#include <tchar.h>
#include <stdio.h> 
#include <stdarg.h>
#include "DXUtil.h"


#ifdef UNICODE
    typedef HINSTANCE (WINAPI* LPShellExecute)(HWND hwnd, LPCWSTR lpOperation, LPCWSTR lpFile, LPCWSTR lpParameters, LPCWSTR lpDirectory, INT nShowCmd);
#else
    typedef HINSTANCE (WINAPI* LPShellExecute)(HWND hwnd, LPCSTR lpOperation, LPCSTR lpFile, LPCSTR lpParameters, LPCSTR lpDirectory, INT nShowCmd);
#endif


#ifndef UNDER_CE
//-----------------------------------------------------------------------------
// Name: DXUtil_GetDXSDKMediaPathCch()
// Desc: Returns the DirectX SDK media path
//       cchDest is the size in TCHARs of strDest.  Be careful not to 
//       pass in sizeof(strDest) on UNICODE builds.
//-----------------------------------------------------------------------------
HRESULT DXUtil_GetDXSDKMediaPathCch( TCHAR* strDest, int cchDest )
{
    if( strDest == NULL || cchDest < 1 )
        return E_INVALIDARG;

    lstrcpy( strDest, TEXT("") );

    // Open the appropriate registry key
    HKEY  hKey;
    LONG lResult = RegOpenKeyEx( HKEY_LOCAL_MACHINE,
                                _T("Software\\Microsoft\\DirectX SDK"),
                                0, KEY_READ, &hKey );
    if( ERROR_SUCCESS != lResult )
        return E_FAIL;

    DWORD dwType;
    DWORD dwSize = cchDest * sizeof(TCHAR);
    lResult = RegQueryValueEx( hKey, _T("DX9SDK Samples Path"), NULL,
                              &dwType, (BYTE*)strDest, &dwSize );
    strDest[cchDest-1] = 0; // RegQueryValueEx doesn't NULL term if buffer too small
    RegCloseKey( hKey );

    if( ERROR_SUCCESS != lResult )
        return E_FAIL;

    const TCHAR* strMedia = _T("\\Media\\");
    if( lstrlen(strDest) + lstrlen(strMedia) < cchDest )
        _tcscat( strDest, strMedia );
    else
        return E_INVALIDARG;

    return S_OK;
}
#endif // !UNDER_CE



#ifndef UNDER_CE
//-----------------------------------------------------------------------------
// Name: DXUtil_FindMediaFileCch()
// Desc: Returns a valid path to a DXSDK media file
//       cchDest is the size in TCHARs of strDestPath.  Be careful not to 
//       pass in sizeof(strDest) on UNICODE builds.
//-----------------------------------------------------------------------------
HRESULT DXUtil_FindMediaFileCch( TCHAR* strDestPath, int cchDest, TCHAR* strFilename )
{
    HRESULT hr;
    HANDLE file;
    TCHAR* strShortNameTmp = NULL;
    TCHAR strShortName[MAX_PATH];
    int cchPath;

    if( NULL==strFilename || NULL==strDestPath || cchDest < 1 )
        return E_INVALIDARG;

    lstrcpy( strDestPath, TEXT("") );
    lstrcpy( strShortName, TEXT("") );

    // Build full path name from strFileName (strShortName will be just the leaf filename)
    cchPath = GetFullPathName(strFilename, cchDest, strDestPath, &strShortNameTmp);
    if ((cchPath == 0) || (cchDest <= cchPath))
        return E_FAIL;
    if( strShortNameTmp )
        lstrcpyn( strShortName, strShortNameTmp, MAX_PATH );

    // first try to find the filename given a full path
    file = CreateFile( strDestPath, GENERIC_READ, FILE_SHARE_READ, NULL, 
                       OPEN_EXISTING, 0, NULL );
    if( INVALID_HANDLE_VALUE != file )
    {
        CloseHandle( file );
        return S_OK;
    }
    
    // next try to find the filename in the current working directory (path stripped)
    file = CreateFile( strShortName, GENERIC_READ, FILE_SHARE_READ, NULL, 
                       OPEN_EXISTING, 0, NULL );
    if( INVALID_HANDLE_VALUE != file )
    {
        _tcsncpy( strDestPath, strShortName, cchDest );
        strDestPath[cchDest-1] = 0; // _tcsncpy doesn't NULL term if it runs out of space
        CloseHandle( file );
        return S_OK;
    }
    
    // last, check if the file exists in the media directory
    if( FAILED( hr = DXUtil_GetDXSDKMediaPathCch( strDestPath, cchDest ) ) )
        return hr;

    if( lstrlen(strDestPath) + lstrlen(strShortName) < cchDest )
        lstrcat( strDestPath, strShortName );
    else
        return E_INVALIDARG;

    file = CreateFile( strDestPath, GENERIC_READ, FILE_SHARE_READ, NULL, 
                       OPEN_EXISTING, 0, NULL );
    if( INVALID_HANDLE_VALUE != file )
    {
        CloseHandle( file );
        return S_OK;
    }

    // On failure, just return the file as the path
    _tcsncpy( strDestPath, strFilename, cchDest );
    strDestPath[cchDest-1] = 0; // _tcsncpy doesn't NULL term if it runs out of space
    return HRESULT_FROM_WIN32( ERROR_FILE_NOT_FOUND );
}
#endif // !UNDER_CE




//-----------------------------------------------------------------------------
// Name: DXUtil_ReadStringRegKeyCch()
// Desc: Helper function to read a registry key string
//       cchDest is the size in TCHARs of strDest.  Be careful not to 
//       pass in sizeof(strDest) on UNICODE builds.
//-----------------------------------------------------------------------------
HRESULT DXUtil_ReadStringRegKeyCch( HKEY hKey, TCHAR* strRegName, TCHAR* strDest, 
                                    DWORD cchDest, TCHAR* strDefault )
{
    DWORD dwType;
    DWORD cbDest = cchDest * sizeof(TCHAR);

    if( ERROR_SUCCESS != RegQueryValueEx( hKey, strRegName, 0, &dwType, 
                                          (BYTE*)strDest, &cbDest ) )
    {
        _tcsncpy( strDest, strDefault, cchDest );
        strDest[cchDest-1] = 0;

        if( dwType != REG_SZ )
            return E_FAIL;

        return S_OK;
    }

    return E_FAIL;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_WriteStringRegKey()
// Desc: Helper function to write a registry key string
//-----------------------------------------------------------------------------
HRESULT DXUtil_WriteStringRegKey( HKEY hKey, TCHAR* strRegName,
                                  TCHAR* strValue )
{
    if( NULL == strValue )
        return E_INVALIDARG;
        
    DWORD cbValue = ((DWORD)_tcslen(strValue)+1) * sizeof(TCHAR);

    if( ERROR_SUCCESS != RegSetValueEx( hKey, strRegName, 0, REG_SZ, 
                                        (BYTE*)strValue, cbValue ) )
        return E_FAIL;

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ReadIntRegKey()
// Desc: Helper function to read a registry key int
//-----------------------------------------------------------------------------
HRESULT DXUtil_ReadIntRegKey( HKEY hKey, TCHAR* strRegName, DWORD* pdwDest, 
                              DWORD dwDefault )
{
    DWORD dwType;
    DWORD dwLength = sizeof(DWORD);

    if( ERROR_SUCCESS != RegQueryValueEx( hKey, strRegName, 0, &dwType, 
                                          (BYTE*)pdwDest, &dwLength ) )
    {
        *pdwDest = dwDefault;
        if( dwType != REG_DWORD )
            return E_FAIL;

        return S_OK;
    }

    return E_FAIL;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_WriteIntRegKey()
// Desc: Helper function to write a registry key int
//-----------------------------------------------------------------------------
HRESULT DXUtil_WriteIntRegKey( HKEY hKey, TCHAR* strRegName, DWORD dwValue )
{
    if( ERROR_SUCCESS != RegSetValueEx( hKey, strRegName, 0, REG_DWORD, 
                                        (BYTE*)&dwValue, sizeof(DWORD) ) )
        return E_FAIL;

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ReadBoolRegKey()
// Desc: Helper function to read a registry key BOOL
//-----------------------------------------------------------------------------
HRESULT DXUtil_ReadBoolRegKey( HKEY hKey, TCHAR* strRegName, BOOL* pbDest, 
                              BOOL bDefault )
{
    DWORD dwType;
    DWORD dwLength = sizeof(BOOL);

    if( ERROR_SUCCESS != RegQueryValueEx( hKey, strRegName, 0, &dwType, 
                                          (BYTE*)pbDest, &dwLength ) )
    {
        *pbDest = bDefault;
        if( dwType != REG_DWORD )
            return E_FAIL;

        return S_OK;
    }

    return E_FAIL;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_WriteBoolRegKey()
// Desc: Helper function to write a registry key BOOL
//-----------------------------------------------------------------------------
HRESULT DXUtil_WriteBoolRegKey( HKEY hKey, TCHAR* strRegName, BOOL bValue )
{
    if( ERROR_SUCCESS != RegSetValueEx( hKey, strRegName, 0, REG_DWORD, 
                                        (BYTE*)&bValue, sizeof(BOOL) ) )
        return E_FAIL;

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_ReadGuidRegKey()
// Desc: Helper function to read a registry key guid
//-----------------------------------------------------------------------------
HRESULT DXUtil_ReadGuidRegKey( HKEY hKey, TCHAR* strRegName, GUID* pGuidDest, 
                               GUID& guidDefault )
{
    DWORD dwType;
    DWORD dwLength = sizeof(GUID);

    if( ERROR_SUCCESS != RegQueryValueEx( hKey, strRegName, 0, &dwType, 
                                          (LPBYTE) pGuidDest, &dwLength ) )
    {
        *pGuidDest = guidDefault;
        if( dwType != REG_BINARY )
            return E_FAIL;

        return S_OK;
    }

    return E_FAIL;
}




//-----------------------------------------------------------------------------
// Name: DXUtil_WriteGuidRegKey()
// Desc: Helper function to write a registry key guid
//-----------------------------------------------------------------------------
HRESULT DXUtil_WriteGuidRegKey( HKEY hKey, TCHAR* 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