binary search

scenes/main_menu.tscn

@@ -1719,12 +1719,12 @@ text = "[font_size=20]fog
 fit_content = true
 horizontal_alignment = 1
 
-[node name="xwalfie" type="RichTextLabel" parent="Menus/Extras/Credits/ScrollContainer/VBoxContainer" unique_id=427847284]
+[node name="nyarw" type="RichTextLabel" parent="Menus/Extras/Credits/ScrollContainer/VBoxContainer" unique_id=427847284]
 modulate = Color(0.2627451, 1, 0.9529412, 1)
 layout_mode = 2
 mouse_filter = 1
 bbcode_enabled = true
-text = "[font_size=20]xwalfie
+text = "[font_size=20]nyarw
 [color=ffffffbb][font_size=16]Contributor"
 fit_content = true
 horizontal_alignment = 1

scripts/game/Runner.cs

@@ -27,6 +27,7 @@ public partial class Runner : Node3D
     private double lastFrame = Time.GetTicksUsec();
     private bool firstFrame = true;
     private bool eventsConnected = false;
+    private double[] noteTimestamps;
 
     [ExportCategory("Settings")]
     [Export] public bool NotesOnly = false;
@@ -206,9 +207,10 @@ public void Play()
 
         foreach (var entry in Attempt.Objects)
         {
-            ObjectIndicesStart[entry.Key] = 0;
+            ObjectIndicesStart[entry.Key] = (int)Attempt.FirstNote;
             ObjectIndicesEnd[entry.Key] = entry.Value.Count;
         }
+        noteTimestamps = Attempt.Objects[typeof(Note)].Select(note => (double)note.Millisecond).ToArray();
 
         if (!NotesOnly)
         {
@@ -311,7 +313,7 @@ public void Seek(double ms)
 
         foreach (var entry in Attempt.Objects)
         {
-            ObjectIndicesStart[entry.Key] = 0;
+            ObjectIndicesStart[entry.Key] = Util.Misc.BinarySearch(noteTimestamps, ms) + 1;
             ObjectIndicesEnd[entry.Key] = entry.Value.Count;
         }
 

scripts/ui/FlatPreview.cs

@@ -13,6 +13,7 @@ public partial class FlatPreview : Panel
     private Color transparent = new(1, 1, 1, 0);
     private ColorRect[] tiles = new ColorRect[9];
     private int lastPassedNote = 0;
+    private double[] noteTimestamps;
 
     public override void _Ready()
     {
@@ -69,14 +70,7 @@ public override void _Process(double delta)
 
         if (Time < oldTime)
         {
-            for (int i = 0; i < Map.Notes.Length; i++)
-            {
-                if (Time < Map.Notes[i].Millisecond)
-                {
-                    lastPassedNote = i - 1;
-                    break;
-                }
-            }
+            lastPassedNote = Util.Misc.BinarySearch(noteTimestamps, Time);
         }
 
         for (int i = Math.Clamp(lastPassedNote + 1, 0, Math.Max(0, Map.Notes.Length - 1)); i < Map.Notes.Length; i++)
@@ -105,6 +99,7 @@ public void Setup(Map map, bool useSoundManagerStreamPlayer = false)
         Map = map;
         UseSoundManagerStreamPlayer = useSoundManagerStreamPlayer;
         lastPassedNote = -1;
+        noteTimestamps = Array.ConvertAll(Map.Notes, note => (double)note.Millisecond);
     }
 
     public void Seek(double seek)
@@ -113,15 +108,6 @@ public void Seek(double seek)
 
         Time = seek;
 
-        for (int i = 0; i < Map.Notes.Length; i++)
-        {
-            var note = Map.Notes[i];
-
-            if (note.Millisecond > Time)
-            {
-                lastPassedNote = i - 1;
-                break;
-            }
-        }
+        lastPassedNote = Util.Misc.BinarySearch(noteTimestamps, seek);
     }
 }

scripts/util/Misc.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
 using System.Security.Cryptography;
@@ -160,4 +161,25 @@ public static float ParseFloatInput(string input, float fallback = 0f)
 
         return fallback;
     }
+
+    public static int BinarySearch(double[] values, double time)
+    {
+        int left = 0, right = values.Length;
+
+        while (left < right)
+        {
+            int middle = (left + right) / 2;
+
+            if (time < values[middle])
+            {
+                right = middle;
+            }
+            else
+            {
+                left = middle + 1;
+            }
+        }
+
+        return left - 1;
+    }
 }