panning and attenuation for pickaxe audio cue

src/net/torvald/terrarum/CreditSingleton.kt

@@ -335,7 +335,7 @@ Sound from <https://freesound.org/people/richwise>
     - effects/explosion/fuse.ogg
     - effects/explosion/fuse_continue.ogg
 ℗ 2012, 2015 j1987 and ScouseMouseJB
-Sound from <https://freesound.org/people/j1987> and <https://freesound.org/people/ScouseMouseJB>
+Remixed sound from <https://freesound.org/people/j1987> and <https://freesound.org/people/ScouseMouseJB>
 
     - effects/accessibility/pickaxe_valuable.ogg
 ℗ 2009 Benboncan

src/net/torvald/terrarum/IngameInstance.kt

@@ -5,6 +5,8 @@ import com.badlogic.gdx.Input
 import com.badlogic.gdx.utils.Disposable
 import net.torvald.terrarum.App.printdbg
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
+import net.torvald.terrarum.audio.MusicContainer
+import net.torvald.terrarum.audio.dsp.BinoPan
 import net.torvald.terrarum.gameactors.Actor
 import net.torvald.terrarum.gameactors.ActorID
 import net.torvald.terrarum.gameactors.ActorWithBody
@@ -442,6 +444,16 @@ open class IngameInstance(val batch: FlippingSpriteBatch, val isMultiplayer: Boo
         loadedTime_t = App.getTIME_T()
     }
 
+    open fun playGUIsound(sound: MusicContainer, volume: Double = 1.0, pan: Float = 0f) {
+        App.audioMixer.guiTrack.let {
+            it.currentTrack = sound
+            it.maxVolumeFun= { volume }
+            it.volume = volume
+            it.playRequested.set(true)
+            it.getFilter<BinoPan>().pan = pan
+        }
+    }
+
     /**
      * Copies most recent `save` to `save.1`, leaving `save` for overwriting, previous `save.1` will be copied to `save.2`
      */

src/net/torvald/terrarum/audio/AudioMixer.kt

@@ -226,10 +226,12 @@ class AudioMixer : Disposable {
     init {
         // initialise audio paths //
 
-        listOf(musicTrack, ambientTrack1, ambientTrack2, ambientTrack3, ambientTrack4).forEach {
+        listOf(musicTrack, ambientTrack1, ambientTrack2, ambientTrack3, ambientTrack4, guiTrack).forEach {
             it.filters[0] = Gain(1f)
         }
 
+        guiTrack.filters[0] = BinoPan(0f)
+
         masterTrack.filters[0] = SoftClp
         masterTrack.filters[1] = Buffer
         masterTrack.filters[2] = Vecto(1.4142f)
@@ -369,7 +371,7 @@ class AudioMixer : Disposable {
             it.getFilter<Gain>().gain = ambientVolume.toFloat()
         }
         sfxSumBus.volume = sfxVolume
-        guiTrack.volume = guiVolume
+        guiTrack.getFilter<Gain>().gain = guiVolume.toFloat()
 
 
         // process fades

src/net/torvald/terrarum/audio/MixerTrackProcessor.kt

@@ -24,6 +24,28 @@ class MixerTrackProcessor(bufferSize: Int, val rate: Int, val track: TerrarumAud
     private var buffertaille = bufferSize
 
     companion object {
+        fun getVolFun(x: Double): Double {
+            // https://www.desmos.com/calculator/blcd4s69gl
+//        val K = 1.225
+//        fun q(x: Double) = if (x >= 1.0) 0.5 else (K*x - K).pow(2.0) + 0.5
+//        val x2 = x.pow(q(x))
+
+            // method 1.
+            // https://www.desmos.com/calculator/uzbjw10lna
+//        val K = 512.0
+//        return K.pow(-sqrt(1.0+x.sqr())) * K
+
+
+            // method 2.
+            // https://www.desmos.com/calculator/3xsac66rsp
+
+
+            // method 3.
+            // comparison with method 1.
+            // https://www.desmos.com/calculator/rbteowef8v
+            val Q = 2.0
+            return 1.0 / cosh(Q * x).sqr()
+        }
     }
 
     @Volatile var running = true; private set
@@ -310,29 +332,6 @@ class MixerTrackProcessor(bufferSize: Int, val rate: Int, val track: TerrarumAud
 //        } // uncomment to multithread
     }
 
-    private fun getVolFun(x: Double): Double {
-        // https://www.desmos.com/calculator/blcd4s69gl
-//        val K = 1.225
-//        fun q(x: Double) = if (x >= 1.0) 0.5 else (K*x - K).pow(2.0) + 0.5
-//        val x2 = x.pow(q(x))
-
-        // method 1.
-        // https://www.desmos.com/calculator/uzbjw10lna
-//        val K = 512.0
-//        return K.pow(-sqrt(1.0+x.sqr())) * K
-
-
-        // method 2.
-        // https://www.desmos.com/calculator/3xsac66rsp
-
-
-        // method 3.
-        // comparison with method 1.
-        // https://www.desmos.com/calculator/rbteowef8v
-        val Q = 2.0
-        return 1.0 / cosh(Q * x).sqr()
-    }
-
     private fun FloatArray.applyVolume(volume: Float) = FloatArray(this.size) { (this[it] * volume) }
     /*private fun FloatArray.applyVolumeInline(volume: Float): FloatArray {
         for (i in this.indices) {

src/net/torvald/terrarum/modulebasegame/gameitems/PickaxeGeneric.kt

@@ -2,9 +2,11 @@ package net.torvald.terrarum.modulebasegame.gameitems
 
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.graphics.g2d.TextureRegion
+import com.jme3.math.FastMath.pow
 import net.torvald.terrarum.*
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZE
 import net.torvald.terrarum.TerrarumAppConfiguration.TILE_SIZED
+import net.torvald.terrarum.audio.MixerTrackProcessor
 import net.torvald.terrarum.audio.MusicContainer
 import net.torvald.terrarum.blockproperties.Block
 import net.torvald.terrarum.gameactors.AVKey
@@ -246,8 +248,14 @@ object PickaxeCore {
             }
 
             // play sound cue
+            val mvec = Vector2(Terrarum.mouseX, Terrarum.mouseY)
+            val dist = distBetween(actor, mvec)
+            val relX = relativeXposition(actor, mvec)
+            val distFallOff = 1.3 * 128.0
+            val pan = 1.3 * relX / distFallOff
+            val vol = MixerTrackProcessor.getVolFun(dist / distFallOff).coerceAtLeast(0.0)
             if (!tooltipWasShown && tooltipSet) {
-                actor.startAudio(soundCue, 0.7) // TODO play on the GUI track
+                INGAME.playGUIsound(soundCue, 0.25 * vol, pan.toFloat())
             }
 
             true // just a placeholder