From 2dca1a2732fabf33c12b6d0f8bcaaf70596fc58d Mon Sep 17 00:00:00 2001
From: Kirill Vainer <shadowislord@gmail.com>
Date: Sun, 10 Apr 2016 23:24:19 -0400
Subject: [PATCH] add AudioListenerState

---
 .../java/com/jme3/app/SimpleApplication.java  |   3 +-
 .../com/jme3/audio/AudioListenerState.java    | 104 ++++++++++++++++++
 .../main/java/com/jme3/audio/Listener.java    |   6 +-
 3 files changed, 109 insertions(+), 4 deletions(-)
 create mode 100644 jme3-core/src/main/java/com/jme3/audio/AudioListenerState.java

diff --git a/jme3-core/src/main/java/com/jme3/app/SimpleApplication.java b/jme3-core/src/main/java/com/jme3/app/SimpleApplication.java
index 2ab008c5c..01c04601c 100644
--- a/jme3-core/src/main/java/com/jme3/app/SimpleApplication.java
+++ b/jme3-core/src/main/java/com/jme3/app/SimpleApplication.java
@@ -32,6 +32,7 @@
 package com.jme3.app;
 
 import com.jme3.app.state.AppState;
+import com.jme3.audio.AudioListenerState;
 import com.jme3.font.BitmapFont;
 import com.jme3.font.BitmapText;
 import com.jme3.input.FlyByCamera;
@@ -96,7 +97,7 @@ public abstract class SimpleApplication extends LegacyApplication {
     }
 
     public SimpleApplication() {
-        this( new StatsAppState(), new FlyCamAppState(), new DebugKeysAppState() );
+        this(new StatsAppState(), new FlyCamAppState(), new AudioListenerState(), new DebugKeysAppState());
     }
 
     public SimpleApplication( AppState... initialStates ) {
diff --git a/jme3-core/src/main/java/com/jme3/audio/AudioListenerState.java b/jme3-core/src/main/java/com/jme3/audio/AudioListenerState.java
new file mode 100644
index 000000000..947cb9231
--- /dev/null
+++ b/jme3-core/src/main/java/com/jme3/audio/AudioListenerState.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright (c) 2009-2016 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.audio;
+
+import com.jme3.app.Application;
+import com.jme3.app.state.BaseAppState;
+import com.jme3.math.Quaternion;
+import com.jme3.math.Vector3f;
+import com.jme3.renderer.Camera;
+import com.jme3.renderer.RenderManager;
+
+/**
+ * <code>AudioListenerState</code> updates the audio listener's position,
+ * orientation, and velocity from a {@link Camera}.
+ *
+ * @author Kirill Vainer
+ */
+public class AudioListenerState extends BaseAppState {
+
+    private Listener listener;
+    private Camera camera;
+    private float lastTpf;
+
+    public AudioListenerState() {
+    }
+
+    @Override
+    protected void initialize(Application app) {
+        this.camera = app.getCamera();
+        this.listener = app.getListener();
+    }
+
+    @Override
+    protected void cleanup(Application app) {
+    }
+
+    @Override
+    public void update(float tpf) {
+        lastTpf = tpf;
+    }
+
+    @Override
+    public void render(RenderManager rm) {
+        if (!isEnabled()) {
+            return;
+        }
+
+        Vector3f lastLocation = listener.getLocation();
+        Vector3f currentLocation = camera.getLocation();
+        Vector3f velocity = listener.getVelocity();
+
+        if (!lastLocation.equals(currentLocation)) {
+            velocity.set(currentLocation).subtractLocal(lastLocation);
+            velocity.multLocal(1f / lastTpf);
+            listener.setLocation(currentLocation);
+            listener.setVelocity(velocity);
+        } else if (!velocity.equals(Vector3f.ZERO)) {
+            listener.setVelocity(Vector3f.ZERO);
+        }
+
+        Quaternion lastRotation = listener.getRotation();
+        Quaternion currentRotation = camera.getRotation();
+        if (!lastRotation.equals(currentRotation)) {
+            listener.setRotation(currentRotation);
+        }
+    }
+
+    @Override
+    protected void onEnable() {
+    }
+
+    @Override
+    protected void onDisable() {
+    }
+}
diff --git a/jme3-core/src/main/java/com/jme3/audio/Listener.java b/jme3-core/src/main/java/com/jme3/audio/Listener.java
index 8e59eac0c..afd08a730 100644
--- a/jme3-core/src/main/java/com/jme3/audio/Listener.java
+++ b/jme3-core/src/main/java/com/jme3/audio/Listener.java
@@ -36,9 +36,9 @@ import com.jme3.math.Vector3f;
 
 public class Listener {
 
-    private Vector3f location;
-    private Vector3f velocity;
-    private Quaternion rotation;
+    private final Vector3f location;
+    private final Vector3f velocity;
+    private final Quaternion rotation;
     private float volume = 1;
     private AudioRenderer renderer;