1 files changed, 108 insertions, 0 deletions
diff --git a/indra/llaudio/llaudioengine_openal.h b/indra/llaudio/llaudioengine_openal.h
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+++ b/indra/llaudio/llaudioengine_openal.h
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+/**
+ * @file audioengine_openal.cpp
+ * @brief implementation of audio engine using OpenAL
+ * support as a OpenAL 3D implementation
+ *
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ * 
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ * 
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ * 
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+
+#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 = 0.05f; // 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