109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
/**
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* @file audioengine_openal.cpp
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* @brief implementation of audio engine using OpenAL
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* support as a OpenAL 3D implementation
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*
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*
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* $LicenseInfo:firstyear=2002&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_AUDIOENGINE_OPENAL_H
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#define LL_AUDIOENGINE_OPENAL_H
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#include "llaudioengine.h"
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#include "lllistener_openal.h"
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#include "llwindgen.h"
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class LLAudioEngine_OpenAL : public LLAudioEngine
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{
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public:
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LLAudioEngine_OpenAL();
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virtual ~LLAudioEngine_OpenAL();
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virtual bool init(void *user_data, const std::string &app_title);
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virtual std::string getDriverName(bool verbose);
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virtual LLStreamingAudioInterface* createDefaultStreamingAudioImpl() const { return nullptr; }
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virtual void allocateListener();
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virtual void shutdown();
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void setInternalGain(F32 gain);
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LLAudioBuffer* createBuffer();
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LLAudioChannel* createChannel();
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/*virtual*/ bool initWind();
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/*virtual*/ void cleanupWind();
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/*virtual*/ void updateWind(LLVector3 direction, F32 camera_altitude);
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private:
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typedef F32 WIND_SAMPLE_T;
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LLWindGen<WIND_SAMPLE_T> *mWindGen;
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F32 *mWindBuf;
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U32 mWindBufFreq;
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U32 mWindBufSamples;
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U32 mWindBufBytes;
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ALuint mWindSource;
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int mNumEmptyWindALBuffers;
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static const int MAX_NUM_WIND_BUFFERS = 80;
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static const float WIND_BUFFER_SIZE_SEC; // 1/20th sec
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};
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class LLAudioChannelOpenAL : public LLAudioChannel
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{
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public:
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LLAudioChannelOpenAL();
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virtual ~LLAudioChannelOpenAL();
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protected:
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/*virtual*/ void play();
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/*virtual*/ void playSynced(LLAudioChannel *channelp);
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/*virtual*/ void cleanup();
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/*virtual*/ bool isPlaying();
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/*virtual*/ bool updateBuffer();
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/*virtual*/ void update3DPosition();
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/*virtual*/ void updateLoop();
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ALuint mALSource;
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ALint mLastSamplePos;
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};
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class LLAudioBufferOpenAL : public LLAudioBuffer{
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public:
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LLAudioBufferOpenAL();
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virtual ~LLAudioBufferOpenAL();
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bool loadWAV(const std::string& filename);
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U32 getLength();
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friend class LLAudioChannelOpenAL;
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protected:
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void cleanup();
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ALuint getBuffer() {return mALBuffer;}
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ALuint mALBuffer;
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};
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#endif
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