Merge pull request #14258 from TheOmyNomy/legacy-cursor-trail-adjustments

Always show cursor trail for legacy cursor with disjoint trail

osu.Android.props

@@ -51,7 +51,7 @@
     <Reference Include="Java.Interop" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.810.0" />
+    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.813.0" />
     <PackageReference Include="ppy.osu.Framework.Android" Version="2021.813.0" />
   </ItemGroup>
   <ItemGroup Label="Transitive Dependencies">

osu.Game.Rulesets.Osu/Skinning/Legacy/LegacyCursorTrail.cs

@@ -9,6 +9,7 @@ using osu.Framework.Input.Events;
 using osu.Game.Configuration;
 using osu.Game.Rulesets.Osu.UI.Cursor;
 using osu.Game.Skinning;
+using osuTK;
 
 namespace osu.Game.Rulesets.Osu.Skinning.Legacy
 {
@@ -21,6 +22,8 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
         private double lastTrailTime;
         private IBindable<float> cursorSize;
 
+        private Vector2? currentPosition;
+
         public LegacyCursorTrail(ISkin skin)
         {
             this.skin = skin;
@@ -54,22 +57,34 @@ namespace osu.Game.Rulesets.Osu.Skinning.Legacy
         }
 
         protected override double FadeDuration => disjointTrail ? 150 : 500;
+        protected override float FadeExponent => 1;
 
         protected override bool InterpolateMovements => !disjointTrail;
 
         protected override float IntervalMultiplier => 1 / Math.Max(cursorSize.Value, 1);
 
+        protected override void Update()
+        {
+            base.Update();
+
+            if (!disjointTrail || !currentPosition.HasValue)
+                return;
+
+            if (Time.Current - lastTrailTime >= disjoint_trail_time_separation)
+            {
+                lastTrailTime = Time.Current;
+                AddTrail(currentPosition.Value);
+            }
+        }
+
         protected override bool OnMouseMove(MouseMoveEvent e)
         {
             if (!disjointTrail)
                 return base.OnMouseMove(e);
 
-            if (Time.Current - lastTrailTime >= disjoint_trail_time_separation)
-            {
-                lastTrailTime = Time.Current;
-                return base.OnMouseMove(e);
-            }
+            currentPosition = e.ScreenSpaceMousePosition;
 
+            // Intentionally block the base call as we're adding the trails ourselves.
             return false;
         }
     }

osu.Game.Rulesets.Osu/UI/Cursor/CursorTrail.cs

@@ -26,6 +26,11 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
     {
         private const int max_sprites = 2048;
 
+        /// <summary>
+        /// An exponentiating factor to ease the trail fade.
+        /// </summary>
+        protected virtual float FadeExponent => 1.7f;
+
         private readonly TrailPart[] parts = new TrailPart[max_sprites];
         private int currentIndex;
         private IShader shader;
@@ -141,22 +146,25 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
 
         protected override bool OnMouseMove(MouseMoveEvent e)
         {
-            Vector2 pos = e.ScreenSpaceMousePosition;
+            AddTrail(e.ScreenSpaceMousePosition);
+            return base.OnMouseMove(e);
+        }
 
-            if (lastPosition == null)
+        protected void AddTrail(Vector2 position)
+        {
+            if (InterpolateMovements)
             {
-                lastPosition = pos;
-                resampler.AddPosition(lastPosition.Value);
-                return base.OnMouseMove(e);
-            }
-
-            foreach (Vector2 pos2 in resampler.AddPosition(pos))
-            {
-                Trace.Assert(lastPosition.HasValue);
-
-                if (InterpolateMovements)
+                if (!lastPosition.HasValue)
                 {
-                    // ReSharper disable once PossibleInvalidOperationException
+                    lastPosition = position;
+                    resampler.AddPosition(lastPosition.Value);
+                    return;
+                }
+
+                foreach (Vector2 pos2 in resampler.AddPosition(position))
+                {
+                    Trace.Assert(lastPosition.HasValue);
+
                     Vector2 pos1 = lastPosition.Value;
                     Vector2 diff = pos2 - pos1;
                     float distance = diff.Length;
@@ -170,14 +178,12 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
                         addPart(lastPosition.Value);
                     }
                 }
-                else
-                {
-                    lastPosition = pos2;
-                    addPart(lastPosition.Value);
-                }
             }
-
-            return base.OnMouseMove(e);
+            else
+            {
+                lastPosition = position;
+                addPart(lastPosition.Value);
+            }
         }
 
         private void addPart(Vector2 screenSpacePosition)
@@ -206,10 +212,10 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
             private Texture texture;
 
             private float time;
+            private float fadeExponent;
 
             private readonly TrailPart[] parts = new TrailPart[max_sprites];
             private Vector2 size;
-
             private Vector2 originPosition;
 
             private readonly QuadBatch<TexturedTrailVertex> vertexBatch = new QuadBatch<TexturedTrailVertex>(max_sprites, 1);
@@ -227,6 +233,7 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
                 texture = Source.texture;
                 size = Source.partSize;
                 time = Source.time;
+                fadeExponent = Source.FadeExponent;
 
                 originPosition = Vector2.Zero;
 
@@ -249,6 +256,7 @@ namespace osu.Game.Rulesets.Osu.UI.Cursor
 
                 shader.Bind();
                 shader.GetUniform<float>("g_FadeClock").UpdateValue(ref time);
+                shader.GetUniform<float>("g_FadeExponent").UpdateValue(ref fadeExponent);
 
                 texture.TextureGL.Bind();
 

osu.Game/osu.Game.csproj

@@ -37,7 +37,7 @@
     </PackageReference>
     <PackageReference Include="Realm" Version="10.3.0" />
     <PackageReference Include="ppy.osu.Framework" Version="2021.813.0" />
-    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.810.0" />
+    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.813.0" />
     <PackageReference Include="Sentry" Version="3.8.3" />
     <PackageReference Include="SharpCompress" Version="0.28.3" />
     <PackageReference Include="NUnit" Version="3.13.2" />

osu.iOS.props

@@ -71,7 +71,7 @@
   </ItemGroup>
   <ItemGroup Label="Package References">
     <PackageReference Include="ppy.osu.Framework.iOS" Version="2021.813.0" />
-    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.810.0" />
+    <PackageReference Include="ppy.osu.Game.Resources" Version="2021.813.0" />
   </ItemGroup>
   <!-- See https://github.com/dotnet/runtime/issues/35988 (can be removed after Xamarin uses net5.0 / net6.0) -->
   <PropertyGroup>