115 lines
3.2 KiB
C++
115 lines
3.2 KiB
C++
/**
|
|
* @file audioengine_openal.cpp
|
|
* @brief implementation of audio engine using OpenAL
|
|
* support as a OpenAL 3D implementation
|
|
*
|
|
*
|
|
* $LicenseInfo:firstyear=2002&license=viewergpl$
|
|
*
|
|
* Copyright (c) 2002-2009, Linden Research, Inc.
|
|
*
|
|
* Second Life Viewer Source Code
|
|
* The source code in this file ("Source Code") is provided by Linden Lab
|
|
* to you under the terms of the GNU General Public License, version 2.0
|
|
* ("GPL"), unless you have obtained a separate licensing agreement
|
|
* ("Other License"), formally executed by you and Linden Lab. Terms of
|
|
* the GPL can be found in doc/GPL-license.txt in this distribution, or
|
|
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
|
|
*
|
|
* There are special exceptions to the terms and conditions of the GPL as
|
|
* it is applied to this Source Code. View the full text of the exception
|
|
* in the file doc/FLOSS-exception.txt in this software distribution, or
|
|
* online at
|
|
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
|
|
*
|
|
* By copying, modifying or distributing this software, you acknowledge
|
|
* that you have read and understood your obligations described above,
|
|
* and agree to abide by those obligations.
|
|
*
|
|
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
|
|
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
|
|
* COMPLETENESS OR PERFORMANCE.
|
|
* $/LicenseInfo$
|
|
*/
|
|
|
|
|
|
#ifndef LL_AUDIOENGINE_OPENAL_H
|
|
#define LL_AUDIOENGINE_OPENAL_H
|
|
|
|
#include "llaudioengine.h"
|
|
#include "lllistener_openal.h"
|
|
#include "llwindgen.h"
|
|
|
|
class LLAudioEngine_OpenAL : public LLAudioEngine
|
|
{
|
|
public:
|
|
LLAudioEngine_OpenAL();
|
|
virtual ~LLAudioEngine_OpenAL();
|
|
|
|
virtual bool init(const S32 num_channels, void *user_data);
|
|
virtual std::string getDriverName(bool verbose);
|
|
virtual void allocateListener();
|
|
|
|
virtual void shutdown();
|
|
|
|
void setInternalGain(F32 gain);
|
|
|
|
LLAudioBuffer* createBuffer();
|
|
LLAudioChannel* createChannel();
|
|
|
|
/*virtual*/ bool initWind();
|
|
/*virtual*/ void cleanupWind();
|
|
/*virtual*/ void updateWind(LLVector3 direction, F32 camera_altitude);
|
|
|
|
private:
|
|
void * windDSP(void *newbuffer, int length);
|
|
typedef S16 WIND_SAMPLE_T;
|
|
LLWindGen<WIND_SAMPLE_T> *mWindGen;
|
|
S16 *mWindBuf;
|
|
U32 mWindBufFreq;
|
|
U32 mWindBufSamples;
|
|
U32 mWindBufBytes;
|
|
ALuint mWindSource;
|
|
int mNumEmptyWindALBuffers;
|
|
|
|
static const int MAX_NUM_WIND_BUFFERS = 80;
|
|
static const float WIND_BUFFER_SIZE_SEC; // 1/20th sec
|
|
};
|
|
|
|
class LLAudioChannelOpenAL : public LLAudioChannel
|
|
{
|
|
public:
|
|
LLAudioChannelOpenAL();
|
|
virtual ~LLAudioChannelOpenAL();
|
|
protected:
|
|
/*virtual*/ void play();
|
|
/*virtual*/ void playSynced(LLAudioChannel *channelp);
|
|
/*virtual*/ void cleanup();
|
|
/*virtual*/ bool isPlaying();
|
|
|
|
/*virtual*/ bool updateBuffer();
|
|
/*virtual*/ void update3DPosition();
|
|
/*virtual*/ void updateLoop();
|
|
|
|
ALuint mALSource;
|
|
ALint mLastSamplePos;
|
|
};
|
|
|
|
class LLAudioBufferOpenAL : public LLAudioBuffer{
|
|
public:
|
|
LLAudioBufferOpenAL();
|
|
virtual ~LLAudioBufferOpenAL();
|
|
|
|
bool loadWAV(const std::string& filename);
|
|
U32 getLength();
|
|
|
|
friend class LLAudioChannelOpenAL;
|
|
protected:
|
|
void cleanup();
|
|
ALuint getBuffer() {return mALBuffer;}
|
|
|
|
ALuint mALBuffer;
|
|
};
|
|
|
|
#endif
|