feat: composer

common/src/main/kotlin/quaedam/projection/music/Composer.kt

@@ -1,20 +1,75 @@
 package quaedam.projection.music
 
+import kotlin.math.abs
 import kotlin.random.Random
+import kotlin.random.nextInt
 
-object Composer {
+/**
+ * The composer for music.
+ * rhythmRandom is used for a better rhythm sync between different instruments.
+ */
+class Composer(val noteRandom: Random, val rhythmRandom: Random) {
 
     data class Note(val note: Int, val volume: Float, val time: Int)
 
-    fun composeMusic(random: Random) = listOf<Note>(
+    val baseTime = arrayOf(5, 5, 3, 3, 4, 4, 2, 2, 10).random(rhythmRandom)
-        Note(0, 1.0f, 3),
+    val baseNote = noteRandom.nextInt(5..19)
-        Note(1, 1.0f, 3),
+
-        Note(2, 1.0f, 3),
+    fun composeMusic() = decorate(
-        Note(3, 1.0f, 3),
+        (0..rhythmRandom.nextInt(5)).flatMap { composeSection() }
-        Note(4, 1.0f, 3),
-        Note(5, 1.0f, 3),
-        Note(6, 1.0f, 3),
-        Note(7, 1.0f, 3),
     )
 
+    fun decorate(notes: List<Note>) = notes.map {
+        if (noteRandom.nextInt(4) == 0) {
+            doDecorate(it)
+        } else {
+            it
+        }
+    }
+
+    fun doDecorate(note: Note): Note {
+        var noteVal = note.note
+        if (noteRandom.nextInt(4) == 0) {
+            if (noteRandom.nextBoolean()) {
+                noteVal += 1
+            } else {
+                noteVal -= 1
+            }
+        }
+        var volume = note.volume
+        if (noteRandom.nextInt(4) == 0) {
+            volume *= noteRandom.nextFloat() * 0.8f + 0.6f
+        }
+        return Note(noteVal, volume, note.time)
+    }
+
+    fun composeSection(depth: Int = 0): List<Note> {
+        if (depth < 3 && rhythmRandom.nextBoolean()) {
+            val notes = (0..rhythmRandom.nextInt(3 - depth)).flatMap { composeSection(depth + 1) }
+            if (depth == 2) {
+                return (0..rhythmRandom.nextInt(3)).flatMap { notes }
+            } else {
+                return notes
+            }
+        } else {
+            var notePointer = baseNote + noteRandom.nextInt(-3..3)
+            var direction = -1
+            var directionCounter = 0
+            return (0..rhythmRandom.nextInt(4..16)).map {
+                if (directionCounter == 0) {
+                    // start new direction
+                    directionCounter = rhythmRandom.nextInt(2..6)
+                    direction = if (directionCounter % 2 == 0) {
+                        rhythmRandom.nextInt(-2..2)
+                    } else {
+                        noteRandom.nextInt(-3..3)
+                    }
+                }
+                notePointer = abs(notePointer + direction) % 25
+                directionCounter--
+                Note(notePointer, 1.0f, baseTime + rhythmRandom.nextInt(-1..1))
+            }
+        }
+    }
+
 }

common/src/main/kotlin/quaedam/projection/music/CyberInstrument.kt

@@ -27,6 +27,7 @@ import net.minecraft.world.level.material.MapColor
 import net.minecraft.world.phys.BlockHitResult
 import quaedam.Quaedam
 import quaedam.projector.Projector
+import quaedam.utils.getChunksNearby
 import quaedam.utils.sendBlockUpdated
 
 object CyberInstrument {
@@ -173,11 +174,24 @@ class CyberInstrumentBlockEntity(pos: BlockPos, state: BlockState) :
     private fun checkProjections() =
         Projector.findNearbyProjections(level!!, blockPos, MusicProjection.effect.get()).isNotEmpty()
 
-    fun startMusic() {
+    fun startMusic(force: Boolean = false, synced: Boolean = false) {
-        if (player == null && !level!!.isClientSide && checkProjections()) {
+        if ((player == null || force) && !level!!.isClientSide && checkProjections()) {
             player = MusicPlayer(level!!.random.nextLong(), level!!, blockPos)
             setChanged()
             sendBlockUpdated()
+            if (!synced) {
+                // sync start to other instruments
+                level!!.getChunksNearby(blockPos, 1)
+                    .flatMap {
+                        it.blockEntities
+                            .filterValues { entity -> entity is CyberInstrumentBlockEntity }
+                            .filterKeys { pos -> pos.distSqr(blockPos) < 100 }
+                            .values
+                    }
+                    .filterNot { it == this }
+                    .filterIsInstance<CyberInstrumentBlockEntity>()
+                    .forEach { it.startMusic(force = true, synced = true) }
+            }
         }
     }
 

common/src/main/kotlin/quaedam/projection/music/MusicPlayer.kt

@@ -31,7 +31,7 @@ class MusicPlayer(val seed: Long, val level: Level, val pos: BlockPos, val start
         tag.getLong(TAG_STARTED_AT)
     )
 
-    var notes = Composer.composeMusic(Random(seed)).toMutableList()
+    var notes = Composer(Random(seed), Random(startedAt / 20 * 15)).composeMusic().toMutableList()
     val totalTime = notes.sumOf { it.time }.toLong()
     var remainingTime = totalTime
     val isEnd get() = remainingTime <= 0 || notes.isEmpty()