dxutmisc.cpp

DX例子中等难度的。全是新例子。VC2003

//--------------------------------------------------------------------------------------
// File: DXUTMisc.cpp
//
// Shortcut macros and functions for using DX objects
//
// Copyright (c) Microsoft Corporation. All rights reserved
//--------------------------------------------------------------------------------------
#include "dxstdafx.h"
#define DXUT_GAMEPAD_TRIGGER_THRESHOLD      30
#undef min // use __min instead
#undef max // use __max instead

//--------------------------------------------------------------------------------------
// Global/Static Members
//--------------------------------------------------------------------------------------
CDXUTResourceCache& DXUTGetGlobalResourceCache()
{
    // Using an accessor function gives control of the construction order
    static CDXUTResourceCache cache;
    return cache;
}
CDXUTTimer* DXUTGetGlobalTimer()
{
    // Using an accessor function gives control of the construction order
    static CDXUTTimer timer;
    return &timer;
}


//--------------------------------------------------------------------------------------
// Internal functions forward declarations
//--------------------------------------------------------------------------------------
bool DXUTFindMediaSearchTypicalDirs( WCHAR* strSearchPath, int cchSearch, LPCWSTR strLeaf, WCHAR* strExePath, WCHAR* strExeName );
bool DXUTFindMediaSearchParentDirs( WCHAR* strSearchPath, int cchSearch, WCHAR* strStartAt, WCHAR* strLeafName );
INT_PTR CALLBACK DisplaySwitchToREFWarningProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam);


//--------------------------------------------------------------------------------------
// Shared code for samples to ask user if they want to use a REF device or quit
//--------------------------------------------------------------------------------------
void DXUTDisplaySwitchingToREFWarning()
{
    if( DXUTGetShowMsgBoxOnError() )
    {
        // Open the appropriate registry key
        DWORD dwSkipWarning = 0;
        HKEY hKey;
        LONG lResult = RegOpenKeyEx( HKEY_CURRENT_USER, L"Software\\Microsoft\\DirectX 9.0 SDK", 0, KEY_READ, &hKey );
        if( ERROR_SUCCESS == lResult ) 
        {
            DWORD dwType;
            DWORD dwSize = sizeof(DWORD);
            lResult = RegQueryValueEx( hKey, L"Skip Warning On REF", NULL, &dwType, (BYTE*)&dwSkipWarning, &dwSize );
            RegCloseKey( hKey );
        }

        if( dwSkipWarning == 0 )
        {
            // Compact code to create a custom dialog box without using a template in a resource file.
            // If this dialog were in a .rc file, this would be a lot simpler but every sample calling this function would
            // need a copy of the dialog in its own .rc file. Also MessageBox API could be used here instead, but 
            // the MessageBox API is simpler to call but it can't provide a "Don't show again" checkbox
            typedef struct { DLGITEMTEMPLATE a; WORD b; WORD c; WORD d; WORD e; WORD f; } DXUT_DLG_ITEM; 
            typedef struct { DLGTEMPLATE a; WORD b; WORD c; WCHAR d[2]; WORD e; WCHAR f[14]; DXUT_DLG_ITEM i1; DXUT_DLG_ITEM i2; DXUT_DLG_ITEM i3; DXUT_DLG_ITEM i4; DXUT_DLG_ITEM i5; } DXUT_DLG_DATA; 

            DXUT_DLG_DATA dtp = 
            {                                                                                                                                                  
                {WS_CAPTION|WS_POPUP|WS_VISIBLE|WS_SYSMENU|DS_ABSALIGN|DS_3DLOOK|DS_SETFONT|DS_MODALFRAME|DS_CENTER,0,5,0,0,269,82},0,0,L" ",8,L"MS Sans Serif", 
                {{WS_CHILD|WS_VISIBLE|SS_ICON|SS_CENTERIMAGE,0,7,7,24,24,0x100},0xFFFF,0x0082,0,0,0}, // icon
                {{WS_CHILD|WS_VISIBLE,0,40,7,230,25,0x101},0xFFFF,0x0082,0,0,0}, // static text
                {{WS_CHILD|WS_VISIBLE|BS_DEFPUSHBUTTON,0,80,39,50,14,IDYES},0xFFFF,0x0080,0,0,0}, // Yes button
                {{WS_CHILD|WS_VISIBLE,0,133,39,50,14,IDNO},0xFFFF,0x0080,0,0,0}, // No button
                {{WS_CHILD|WS_VISIBLE|BS_CHECKBOX,0,7,59,70,16,IDIGNORE},0xFFFF,0x0080,0,0,0}, // checkbox
            }; 

            int nResult = (int) DialogBoxIndirect( DXUTGetHINSTANCE(), (DLGTEMPLATE*)&dtp, DXUTGetHWND(), DisplaySwitchToREFWarningProc ); 

            if( (nResult & 0x80) == 0x80 ) // "Don't show again" checkbox was checked
            {
                lResult = RegOpenKeyEx( HKEY_CURRENT_USER, L"Software\\Microsoft\\DirectX 9.0 SDK", 0, KEY_WRITE, &hKey );
                if( ERROR_SUCCESS == lResult ) 
                {
                    dwSkipWarning = 1;
                    RegSetValueEx( hKey, L"Skip Warning On REF", 0, REG_DWORD, (BYTE*)&dwSkipWarning, sizeof(DWORD) );
                    RegCloseKey( hKey );
                }
            }

            // User choose not to continue
            if( (nResult & 0x0F) == IDNO )
                DXUTShutdown(1);
        }
    }
}


//--------------------------------------------------------------------------------------
// MsgProc for DXUTDisplaySwitchingToREFWarning() dialog box
//--------------------------------------------------------------------------------------
INT_PTR CALLBACK DisplaySwitchToREFWarningProc(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) 
{ 
    switch (message) 
    { 
        case WM_INITDIALOG:
            // Easier to set text here than in the DLGITEMTEMPLATE
            SetWindowText( hDlg, DXUTGetWindowTitle() );
            SendMessage( GetDlgItem(hDlg, 0x100), STM_SETIMAGE, IMAGE_ICON, (LPARAM)LoadIcon(0, IDI_QUESTION));
            SetDlgItemText( hDlg, 0x101, L"Switching to the Direct3D reference rasterizer, a software device\nthat implements the entire Direct3D feature set, but runs very slowly.\nDo you wish to continue?" ); 
            SetDlgItemText( hDlg, IDYES, L"&Yes" );
            SetDlgItemText( hDlg, IDNO, L"&No" );
            SetDlgItemText( hDlg, IDIGNORE, L"&Don't show again" );
            break;

        case WM_COMMAND: 
            switch (LOWORD(wParam)) 
            { 
                case IDIGNORE: CheckDlgButton( hDlg, IDIGNORE, (IsDlgButtonChecked( hDlg, IDIGNORE ) == BST_CHECKED) ? BST_UNCHECKED : BST_CHECKED ); EnableWindow( GetDlgItem( hDlg, IDNO ), (IsDlgButtonChecked( hDlg, IDIGNORE ) != BST_CHECKED) ); break;
                case IDNO: EndDialog(hDlg, (IsDlgButtonChecked( hDlg, IDIGNORE ) == BST_CHECKED) ? IDNO|0x80 : IDNO|0x00 ); return TRUE; 
                case IDCANCEL:
                case IDYES: EndDialog(hDlg, (IsDlgButtonChecked( hDlg, IDIGNORE ) == BST_CHECKED) ? IDYES|0x80 : IDYES|0x00 ); return TRUE; 
            } 
            break;
    } 
    return FALSE; 
} 


//--------------------------------------------------------------------------------------
CDXUTTimer::CDXUTTimer()
{
    m_bTimerStopped     = true;
    m_llQPFTicksPerSec  = 0;

    m_llStopTime        = 0;
    m_llLastElapsedTime = 0;
    m_llBaseTime        = 0;

    // Use QueryPerformanceFrequency to get the frequency of the counter
    LARGE_INTEGER qwTicksPerSec;
    QueryPerformanceFrequency( &qwTicksPerSec );
    m_llQPFTicksPerSec = qwTicksPerSec.QuadPart;
}


//--------------------------------------------------------------------------------------
void CDXUTTimer::Reset()
{
    LARGE_INTEGER qwTime = GetAdjustedCurrentTime();
    
    m_llBaseTime        = qwTime.QuadPart;
    m_llLastElapsedTime = qwTime.QuadPart;
    m_llStopTime        = 0;
    m_bTimerStopped     = FALSE;
}


//--------------------------------------------------------------------------------------
void CDXUTTimer::Start()
{
    // Get the current time
    LARGE_INTEGER qwTime;
    QueryPerformanceCounter( &qwTime );

    if( m_bTimerStopped )
        m_llBaseTime += qwTime.QuadPart - m_llStopTime;
    m_llStopTime = 0;
    m_llLastElapsedTime = qwTime.QuadPart;
    m_bTimerStopped = FALSE;
}


//--------------------------------------------------------------------------------------
void CDXUTTimer::Stop()
{
    if( !m_bTimerStopped )
    {
        LARGE_INTEGER qwTime;
        QueryPerformanceCounter( &qwTime );
        m_llStopTime = qwTime.QuadPart;
        m_llLastElapsedTime = qwTime.QuadPart;
        m_bTimerStopped = TRUE;
    }
}


//--------------------------------------------------------------------------------------
void CDXUTTimer::Advance()
{
    m_llStopTime += m_llQPFTicksPerSec/10;
}


//--------------------------------------------------------------------------------------
double CDXUTTimer::GetAbsoluteTime()
{
    LARGE_INTEGER qwTime;
    QueryPerformanceCounter( &qwTime );

    double fTime = qwTime.QuadPart / (double) m_llQPFTicksPerSec;

    return fTime;
}


//--------------------------------------------------------------------------------------
double CDXUTTimer::GetTime()
{
    LARGE_INTEGER qwTime = GetAdjustedCurrentTime();

    double fAppTime = (double) ( qwTime.QuadPart - m_llBaseTime ) / (double) m_llQPFTicksPerSec;

    return fAppTime;
}


//--------------------------------------------------------------------------------------
void CDXUTTimer::GetTimeValues( double* pfTime, double* pfAbsoluteTime, float* pfElapsedTime )
{
    assert( pfTime && pfAbsoluteTime && pfElapsedTime );    

    LARGE_INTEGER qwTime = GetAdjustedCurrentTime();

    float fElapsedTime = (float) ((double) ( qwTime.QuadPart - m_llLastElapsedTime ) / (double) m_llQPFTicksPerSec);
    m_llLastElapsedTime = qwTime.QuadPart;

    // Clamp the timer to non-negative values to ensure the timer is accurate.
    // fElapsedTime can be outside this range if processor goes into a 
    // power save mode or we somehow get shuffled to another processor.  
    // However, the main thread should call SetThreadAffinityMask to ensure that 
    // we don't get shuffled to another processor.  Other worker threads should NOT call 
    // SetThreadAffinityMask, but use a shared copy of the timer data gathered from 
    // the main thread.
    if( fElapsedTime < 0.0f )
        fElapsedTime = 0.0f;
    
    *pfAbsoluteTime = qwTime.QuadPart / (double) m_llQPFTicksPerSec;
    *pfTime = ( qwTime.QuadPart - m_llBaseTime ) / (double) m_llQPFTicksPerSec;   
    *pfElapsedTime = fElapsedTime;
}


//--------------------------------------------------------------------------------------
double CDXUTTimer::GetElapsedTime()
{
    LARGE_INTEGER qwTime = GetAdjustedCurrentTime();

    double fElapsedTime = (double) ( qwTime.QuadPart - m_llLastElapsedTime ) / (double) m_llQPFTicksPerSec;
    m_llLastElapsedTime = qwTime.QuadPart;

    // See the explanation about clamping in CDXUTTimer::GetTimeValues()
    if( fElapsedTime < 0.0f )
        fElapsedTime = 0.0f;

    return fElapsedTime;
}


//--------------------------------------------------------------------------------------
// If stopped, returns time when stopped otherwise returns current time
//--------------------------------------------------------------------------------------
LARGE_INTEGER CDXUTTimer::GetAdjustedCurrentTime()
{
    LARGE_INTEGER qwTime;
    if( m_llStopTime != 0 )
        qwTime.QuadPart = m_llStopTime;
    else
        QueryPerformanceCounter( &qwTime );
    return qwTime;
}


//--------------------------------------------------------------------------------------
bool CDXUTTimer::IsStopped()
{
    return m_bTimerStopped;
}


//--------------------------------------------------------------------------------------
// Limit the current thread to one processor (the current one). This ensures that timing code 
// runs on only one processor, and will not suffer any ill effects from power management.
// See "Game Timing and Multicore Processors" for more details
//--------------------------------------------------------------------------------------
void CDXUTTimer::LimitThreadAffinityToCurrentProc()
{
    HANDLE hCurrentProcess = GetCurrentProcess();
    
    // Get the processor affinity mask for this process
    DWORD_PTR dwProcessAffinityMask = 0;
    DWORD_PTR dwSystemAffinityMask = 0;
    
    if( GetProcessAffinityMask( hCurrentProcess, &dwProcessAffinityMask, &dwSystemAffinityMask ) != 0 && dwProcessAffinityMask )
    {
        // Find the lowest processor that our process is allows to run against
        DWORD_PTR dwAffinityMask = ( dwProcessAffinityMask & ((~dwProcessAffinityMask) + 1 ) );

        // Set this as the processor that our thread must always run against
        // This must be a subset of the process affinity mask
        HANDLE hCurrentThread = GetCurrentThread();
        if( INVALID_HANDLE_VALUE != hCurrentThread )
        {
            SetThreadAffinityMask( hCurrentThread, dwAffinityMask );
            CloseHandle( hCurrentThread );
        }
    }

    CloseHandle( hCurrentProcess );
}


//--------------------------------------------------------------------------------------
// Returns pointer to static media search buffer
//--------------------------------------------------------------------------------------
WCHAR* DXUTMediaSearchPath()
{
    static WCHAR s_strMediaSearchPath[MAX_PATH] = {0};
    return s_strMediaSearchPath;

}   

//--------------------------------------------------------------------------------------
LPCWSTR DXUTGetMediaSearchPath()
{
    return DXUTMediaSearchPath();
}


//--------------------------------------------------------------------------------------
HRESULT DXUTSetMediaSearchPath( LPCWSTR strPath )
{
    HRESULT hr;

    WCHAR* s_strSearchPath = DXUTMediaSearchPath();