DirectX游戏编程基础课上的2D游戏综合示例教程

//----------------------------------------------------------------------------- // File: DSUtil.cpp // // Desc: DirectSound framework classes for reading and writing wav files and // playing them in DirectSound buffers. Feel free to use this class // as a starting point for adding extra functionality. // // Copyright (c) Microsoft Corp. All rights reserved. //----------------------------------------------------------------------------- // // Note: This file has been edited for use in Beginning Game Programming, Third Edition, // originally distributed with a 2004 release of DirectX 9.0c SDK. // #define STRICT #include <windows.h> #include <mmsystem.h> #include <dxerr9.h> #include <dsound.h> #include "DirectSound.h" //----------------------------------------------------------------------------- // Miscellaneous helper functions //----------------------------------------------------------------------------- #define SAFE_DELETE(p) { if(p) { delete (p); (p)=NULL; } } #define SAFE_DELETE_ARRAY(p) { if(p) { delete[] (p); (p)=NULL; } } #define SAFE_RELEASE(p) { if(p) { (p)->Release(); (p)=NULL; } } //----------------------------------------------------------------------------- // Name: CSoundManager::CSoundManager() // Desc: Constructs the class //----------------------------------------------------------------------------- CSoundManager::CSoundManager() { m_pDS = NULL; } //----------------------------------------------------------------------------- // Name: CSoundManager::~CSoundManager() // Desc: Destroys the class //----------------------------------------------------------------------------- CSoundManager::~CSoundManager() { SAFE_RELEASE( m_pDS ); } //----------------------------------------------------------------------------- // Name: CSoundManager::Initialize() // Desc: Initializes the IDirectSound object and also sets the primary buffer // format. This function must be called before any others. //----------------------------------------------------------------------------- HRESULT CSoundManager::Initialize( HWND hWnd, DWORD dwCoopLevel ) { HRESULT hr; SAFE_RELEASE( m_pDS ); // Create IDirectSound using the primary sound device if( FAILED( hr = DirectSoundCreate8( NULL, &m_pDS, NULL ) ) ) return DXTRACE_ERR( TEXT("DirectSoundCreate8"), hr ); // Set DirectSound coop level if( FAILED( hr = m_pDS->SetCooperativeLevel( hWnd, dwCoopLevel ) ) ) return DXTRACE_ERR( TEXT("SetCooperativeLevel"), hr ); return S_OK; } //----------------------------------------------------------------------------- // Name: CSoundManager::SetPrimaryBufferFormat() // Desc: Set primary buffer to a specified format // !WARNING! - Setting the primary buffer format and then using this // same dsound object for DirectMusic messes up DirectMusic! // For example, to set the primary buffer format to 22kHz stereo, 16-bit // then: dwPrimaryChannels = 2 // dwPrimaryFreq = 22050, // dwPrimaryBitRate = 16 //----------------------------------------------------------------------------- HRESULT CSoundManager::SetPrimaryBufferFormat( DWORD dwPrimaryChannels, DWORD dwPrimaryFreq, DWORD dwPrimaryBitRate ) { HRESULT hr; LPDIRECTSOUNDBUFFER pDSBPrimary = NULL; if( m_pDS == NULL ) return CO_E_NOTINITIALIZED; // Get the primary buffer DSBUFFERDESC dsbd; ZeroMemory( &dsbd, sizeof(DSBUFFERDESC) ); dsbd.dwSize = sizeof(DSBUFFERDESC); dsbd.dwFlags = DSBCAPS_PRIMARYBUFFER; dsbd.dwBufferBytes = 0; dsbd.lpwfxFormat = NULL; if( FAILED( hr = m_pDS->CreateSoundBuffer( &dsbd, &pDSBPrimary, NULL ) ) ) return DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr ); WAVEFORMATEX wfx; ZeroMemory( &wfx, sizeof(WAVEFORMATEX) ); wfx.wFormatTag = (WORD) WAVE_FORMAT_PCM; wfx.nChannels = (WORD) dwPrimaryChannels; wfx.nSamplesPerSec = (DWORD) dwPrimaryFreq; wfx.wBitsPerSample = (WORD) dwPrimaryBitRate; wfx.nBlockAlign = (WORD) (wfx.wBitsPerSample / 8 * wfx.nChannels); wfx.nAvgBytesPerSec = (DWORD) (wfx.nSamplesPerSec * wfx.nBlockAlign); if( FAILED( hr = pDSBPrimary->SetFormat(&wfx) ) ) return DXTRACE_ERR( TEXT("SetFormat"), hr ); SAFE_RELEASE( pDSBPrimary ); return S_OK; } //----------------------------------------------------------------------------- // Name: CSoundManager::Create() // Desc: //----------------------------------------------------------------------------- HRESULT CSoundManager::Create( CSound** ppSound, LPTSTR strWaveFileName, DWORD dwCreationFlags, GUID guid3DAlgorithm, DWORD dwNumBuffers ) { HRESULT hr; HRESULT hrRet = S_OK; DWORD i; LPDIRECTSOUNDBUFFER* apDSBuffer = NULL; DWORD dwDSBufferSize = NULL; CWaveFile* pWaveFile = NULL; if( m_pDS == NULL ) return CO_E_NOTINITIALIZED; if( strWaveFileName == NULL || ppSound == NULL || dwNumBuffers < 1 ) return E_INVALIDARG; apDSBuffer = new LPDIRECTSOUNDBUFFER[dwNumBuffers]; if( apDSBuffer == NULL ) { hr = E_OUTOFMEMORY; goto LFail; } pWaveFile = new CWaveFile(); if( pWaveFile == NULL ) { hr = E_OUTOFMEMORY; goto LFail; } pWaveFile->Open( strWaveFileName, NULL, WAVEFILE_READ ); if( pWaveFile->GetSize() == 0 ) { // Wave is blank, so don't create it. hr = E_FAIL; goto LFail; } // Make the DirectSound buffer the same size as the wav file dwDSBufferSize = pWaveFile->GetSize(); // Create the direct sound buffer, and only request the flags needed // since each requires some overhead and limits if the buffer can // be hardware accelerated DSBUFFERDESC dsbd; ZeroMemory( &dsbd, sizeof(DSBUFFERDESC) ); dsbd.dwSize = sizeof(DSBUFFERDESC); dsbd.dwFlags = dwCreationFlags; dsbd.dwBufferBytes = dwDSBufferSize; dsbd.guid3DAlgorithm = guid3DAlgorithm; dsbd.lpwfxFormat = pWaveFile->m_pwfx; // DirectSound is only guarenteed to play PCM data. Other // formats may or may not work depending the sound card driver. hr = m_pDS->CreateSoundBuffer( &dsbd, &apDSBuffer[0], NULL ); // Be sure to return this error code if it occurs so the // callers knows this happened. if( hr == DS_NO_VIRTUALIZATION ) hrRet = DS_NO_VIRTUALIZATION; if( FAILED(hr) ) { // DSERR_BUFFERTOOSMALL will be returned if the buffer is // less than DSBSIZE_FX_MIN and the buffer is created // with DSBCAPS_CTRLFX. // It might also fail if hardware buffer mixing was requested // on a device that doesn't support it. DXTRACE_ERR( TEXT("CreateSoundBuffer"), hr ); goto LFail; } // Default to use DuplicateSoundBuffer() when created extra buffers since always // create a buffer that uses the same memory however DuplicateSoundBuffer() will fail if // DSBCAPS_CTRLFX is used, so use CreateSoundBuffer() instead in this case. if( (dwCreationFlags & DSBCAPS_CTRLFX) == 0 ) { for( i=1; i<dwNumBuffers; i++ ) { if( FAILED( hr = m_pDS->DuplicateSoundBuffer( apDSBuffer[0], &apDSBuffer[i] ) ) ) { DXTRACE_ERR( TEXT("DuplicateSoundBuffer"