Added a background sound effect when flying as a pegasus

src/main/java/com/minelittlepony/unicopia/InteractionManager.java

@@ -19,6 +19,7 @@ public class InteractionManager {
     public static final int SOUND_CHANGELING_BUZZ = 1;
     public static final int SOUND_BEE = 2;
     public static final int SOUND_MINECART = 3;
+    public static final int SOUND_GLIDING = 4;
 
     public static InteractionManager INSTANCE = new InteractionManager();
 

src/main/java/com/minelittlepony/unicopia/client/ClientInteractionManager.java

@@ -7,6 +7,7 @@ import com.minelittlepony.unicopia.FlightType;
 import com.minelittlepony.unicopia.InteractionManager;
 import com.minelittlepony.unicopia.USounds;
 import com.minelittlepony.unicopia.client.sound.LoopingSoundInstance;
+import com.minelittlepony.unicopia.client.sound.MotionBasedSoundInstance;
 import com.minelittlepony.unicopia.entity.effect.SunBlindnessStatusEffect;
 import com.minelittlepony.unicopia.entity.player.PlayerPhysics;
 import com.minelittlepony.unicopia.entity.player.Pony;
@@ -27,6 +28,7 @@ import net.minecraft.entity.LivingEntity;
 import net.minecraft.entity.passive.BeeEntity;
 import net.minecraft.entity.player.PlayerEntity;
 import net.minecraft.entity.vehicle.AbstractMinecartEntity;
+import net.minecraft.sound.SoundEvents;
 import net.minecraft.world.World;
 
 public class ClientInteractionManager extends InteractionManager {
@@ -64,6 +66,8 @@ public class ClientInteractionManager extends InteractionManager {
                 PlayerPhysics physics = Pony.of(e).getPhysics();
                 return physics.isFlying() && physics.getFlightType() == FlightType.INSECTOID;
             }, USounds.ENTITY_PLAYER_CHANGELING_BUZZ, 1F, 1F));
+        } else if (type == SOUND_GLIDING && source instanceof PlayerEntity) {
+            soundManager.play(new MotionBasedSoundInstance(SoundEvents.ITEM_ELYTRA_FLYING, (PlayerEntity)source));
         }
     }
 

src/main/java/com/minelittlepony/unicopia/client/sound/MotionBasedSoundInstance.java

@@ -0,0 +1,59 @@
+package com.minelittlepony.unicopia.client.sound;
+
+import com.minelittlepony.unicopia.entity.player.Pony;
+
+import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.sound.SoundEvent;
+import net.minecraft.util.math.MathHelper;
+
+public class MotionBasedSoundInstance extends FadeOutSoundInstance {
+
+    private final PlayerEntity player;
+
+    private int tickCount;
+
+    public MotionBasedSoundInstance(SoundEvent sound, PlayerEntity player) {
+        super(sound, player.getSoundCategory(), 0.1F);
+        this.player = player;
+    }
+
+    @Override
+    protected boolean shouldKeepPlaying() {
+        ++tickCount;
+
+        if (player.isRemoved() || tickCount > 200) {
+            return false;
+        }
+
+        Pony pony = Pony.of(player);
+
+        if (!pony.getPhysics().isFlying() || !pony.getPhysics().getFlightType().isAvian()) {
+            return false;
+        }
+
+        x = ((float)player.getX());
+        y = ((float)player.getY());
+        z = ((float)this.player.getZ());
+
+        float f = (float)player.getVelocity().lengthSquared();
+        if (f >= 1.0E-7D) {
+           volume = MathHelper.clamp(f / 4F, 0, 1);
+        } else {
+           volume = 0.0F;
+        }
+
+        if (tickCount < 20) {
+           volume = 0;
+        } else if (tickCount < 40) {
+           volume = (float)(volume * ((tickCount - 20) / 20D));
+        }
+
+        if (volume > 0.8F) {
+           pitch = 1 + (volume - 0.8F);
+        } else {
+           pitch = 1;
+        }
+
+        return true;
+    }
+}

src/main/java/com/minelittlepony/unicopia/entity/player/PlayerPhysics.java

@@ -304,6 +304,11 @@ public class PlayerPhysics extends EntityPhysics<PlayerEntity> implements Tickab
                 flapping = true;
                 ticksToGlide = 20;
             }
+
+            if (ticksInAir % 200 == 1) {
+                InteractionManager.instance().playLoopingSound(entity, InteractionManager.SOUND_GLIDING);
+            }
+
             velocity.y -= 0.02 * getGravitySignum();
             velocity.x *= 0.9896;
             velocity.z *= 0.9896;