From abd223a6237c8f21260baf10cbeda21fb79ebc82 Mon Sep 17 00:00:00 2001
From: spatialfree <mail@ethanmerchant.com>
Date: Sat, 21 Dec 2024 14:24:30 -0500
Subject: [PATCH] slash tip pos frame circle buffer

---
 src/Arts.cs | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/src/Arts.cs b/src/Arts.cs
index 9a336e9..cfd9973 100644
--- a/src/Arts.cs
+++ b/src/Arts.cs
@@ -18,10 +18,14 @@ static class Arts
 
     public static Vec3 shake = new(0, 0, 0);
     // static Quat spin_ori = Quat.Identity;
-    public static Vec3 last_tip_pos = new(0, 0, 0);
 
     static TextStyle text_style;
 
+    // slash tip pos frame circle buffer
+    static int tip_index = 0;
+    static int tip_count = 12;
+    static Vec3[] tip_buffer = new Vec3[tip_count];
+
     public static void Init()
     {
         foreach (ModelNode node in assets_model.Nodes)
@@ -239,11 +243,14 @@ static class Arts
         Quat blade_ori = Rig.r_hld.orientation;
         Vec3 blade_pos = Rig.r_hld.position;
         Vec3 tip_pos = blade_pos + blade_ori * V.XYZ(0, 0, -1);
+        tip_index = (tip_index + 1) % tip_count;
+        tip_buffer[tip_index] = tip_pos;
+        Vec3 oldest_tip = tip_buffer[(tip_index + 1) % tip_count];
         mesh.SetData(
             new Vertex[] {
                 new(    blade_pos, V.XYZ(0,0,1)),
                 new(     tip_pos, V.XYZ(0,0,1)),
-                new(last_tip_pos, V.XYZ(0,0,1))
+                new(oldest_tip, V.XYZ(0,0,1))
             },
             new uint[] {
                 0, 1, 2
@@ -254,9 +261,9 @@ static class Arts
             Matrix.Identity,
             Color.Hex(0xF9BF05FF).ToLinear()
         );
-        Ray slash_ray = new Ray(tip_pos, Vec3.Direction(tip_pos, last_tip_pos));
-        float ray_dist = Vec3.Distance(tip_pos, last_tip_pos);
-        last_tip_pos = Vec3.Lerp(last_tip_pos, tip_pos, Time.Stepf / 0.1f);
+        Ray slash_ray = new Ray(tip_pos, Vec3.Direction(tip_pos, oldest_tip));
+        float ray_dist = Vec3.Distance(tip_pos, oldest_tip);
+        // last_tip_pos = Vec3.Lerp(last_tip_pos, tip_pos, Time.Stepf / 0.1f);
 
         if (true) // hit test
         {