From 5adeee20fd893f1c7b04206365b6b06a8bacaa9c Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Sat, 31 Mar 2012 00:57:29 -0700
Subject: [PATCH] Mute sounds that go outside the max distance

---
 apps/openmw/mwsound/openal_output.cpp | 34 +++++++++++++++++----------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/apps/openmw/mwsound/openal_output.cpp b/apps/openmw/mwsound/openal_output.cpp
index 9fda1470c..1b90c62fa 100644
--- a/apps/openmw/mwsound/openal_output.cpp
+++ b/apps/openmw/mwsound/openal_output.cpp
@@ -77,6 +77,7 @@ class OpenAL_SoundStream : public Sound
     ALuint mBufferSize;
 
     DecoderPtr mDecoder;
+    bool mIs3D;
 
     volatile bool mIsFinished;
 
@@ -84,7 +85,7 @@ class OpenAL_SoundStream : public Sound
     OpenAL_SoundStream& operator=(const OpenAL_SoundStream &rhs);
 
 public:
-    OpenAL_SoundStream(OpenAL_Output &output, ALuint src, DecoderPtr decoder);
+    OpenAL_SoundStream(OpenAL_Output &output, ALuint src, DecoderPtr decoder, bool is3D);
     virtual ~OpenAL_SoundStream();
 
     virtual void stop();
@@ -164,8 +165,8 @@ private:
 };
 
 
-OpenAL_SoundStream::OpenAL_SoundStream(OpenAL_Output &output, ALuint src, DecoderPtr decoder)
-  : mOutput(output), mSource(src), mDecoder(decoder), mIsFinished(true)
+OpenAL_SoundStream::OpenAL_SoundStream(OpenAL_Output &output, ALuint src, DecoderPtr decoder, bool is3D)
+  : mOutput(output), mSource(src), mDecoder(decoder), mIs3D(is3D), mIsFinished(true)
 {
     throwALerror();
 
@@ -256,7 +257,10 @@ bool OpenAL_SoundStream::isPlaying()
 
 void OpenAL_SoundStream::update()
 {
-    alSourcef(mSource, AL_GAIN, mVolume*mBaseVolume);
+    if(mIs3D && mPos.squaredDistance(mOutput.mPos) > mMaxDistance*mMaxDistance)
+        alSourcef(mSource, AL_GAIN, 0.0f);
+    else
+        alSourcef(mSource, AL_GAIN, mVolume*mBaseVolume);
     alSource3f(mSource, AL_POSITION, mPos[0], mPos[2], -mPos[1]);
     alSource3f(mSource, AL_DIRECTION, 0.0f, 0.0f, 0.0f);
     alSource3f(mSource, AL_VELOCITY, 0.0f, 0.0f, 0.0f);
@@ -323,11 +327,13 @@ class OpenAL_Sound : public Sound
     ALuint mSource;
     ALuint mBuffer;
 
+    bool mIs3D;
+
     OpenAL_Sound(const OpenAL_Sound &rhs);
     OpenAL_Sound& operator=(const OpenAL_Sound &rhs);
 
 public:
-    OpenAL_Sound(OpenAL_Output &output, ALuint src, ALuint buf);
+    OpenAL_Sound(OpenAL_Output &output, ALuint src, ALuint buf, bool is3D);
     virtual ~OpenAL_Sound();
 
     virtual void stop();
@@ -335,8 +341,8 @@ public:
     virtual void update();
 };
 
-OpenAL_Sound::OpenAL_Sound(OpenAL_Output &output, ALuint src, ALuint buf)
-  : mOutput(output), mSource(src), mBuffer(buf)
+OpenAL_Sound::OpenAL_Sound(OpenAL_Output &output, ALuint src, ALuint buf, bool is3D)
+  : mOutput(output), mSource(src), mBuffer(buf), mIs3D(is3D)
 {
 }
 OpenAL_Sound::~OpenAL_Sound()
@@ -366,7 +372,10 @@ bool OpenAL_Sound::isPlaying()
 
 void OpenAL_Sound::update()
 {
-    alSourcef(mSource, AL_GAIN, mVolume*mBaseVolume);
+    if(mIs3D && mPos.squaredDistance(mOutput.mPos) > mMaxDistance*mMaxDistance)
+        alSourcef(mSource, AL_GAIN, 0.0f);
+    else
+        alSourcef(mSource, AL_GAIN, mVolume*mBaseVolume);
     alSource3f(mSource, AL_POSITION, mPos[0], mPos[2], -mPos[1]);
     alSource3f(mSource, AL_DIRECTION, 0.0f, 0.0f, 0.0f);
     alSource3f(mSource, AL_VELOCITY, 0.0f, 0.0f, 0.0f);
@@ -583,7 +592,7 @@ SoundPtr OpenAL_Output::playSound(const std::string &fname, float volume, float
     try
     {
         buf = getBuffer(fname);
-        sound.reset(new OpenAL_Sound(*this, src, buf));
+        sound.reset(new OpenAL_Sound(*this, src, buf, false));
     }
     catch(std::exception &e)
     {
@@ -632,7 +641,7 @@ SoundPtr OpenAL_Output::playSound3D(const std::string &fname, const Ogre::Vector
     try
     {
         buf = getBuffer(fname);
-        sound.reset(new OpenAL_Sound(*this, src, buf));
+        sound.reset(new OpenAL_Sound(*this, src, buf, true));
     }
     catch(std::exception &e)
     {
@@ -651,7 +660,8 @@ SoundPtr OpenAL_Output::playSound3D(const std::string &fname, const Ogre::Vector
     alSourcef(src, AL_MAX_DISTANCE, max);
     alSourcef(src, AL_ROLLOFF_FACTOR, 1.0f);
 
-    alSourcef(src, AL_GAIN, volume);
+    alSourcef(src, AL_GAIN, (pos.squaredDistance(mPos) > max*max) ?
+                             0.0f : volume);
     alSourcef(src, AL_PITCH, pitch);
 
     alSourcei(src, AL_SOURCE_RELATIVE, AL_FALSE);
@@ -682,7 +692,7 @@ SoundPtr OpenAL_Output::streamSound(const std::string &fname, float volume, floa
     {
         DecoderPtr decoder = mManager.getDecoder();
         decoder->open(fname);
-        sound.reset(new OpenAL_SoundStream(*this, src, decoder));
+        sound.reset(new OpenAL_SoundStream(*this, src, decoder, false));
     }
     catch(std::exception &e)
     {