From 886afd20cd677be8253c9a7e1ba7e22e095e0f61 Mon Sep 17 00:00:00 2001
From: ikpil <ikpil@naver.com>
Date: Thu, 16 May 2024 00:46:05 +0900
Subject: [PATCH] reduced memory usage of DtLink.

---
 src/DotRecast.Detour/DtLink.cs    |  9 ++++-----
 src/DotRecast.Detour/DtNavMesh.cs | 18 +++++++++---------
 2 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/src/DotRecast.Detour/DtLink.cs b/src/DotRecast.Detour/DtLink.cs
index 13360e4..d0c8fa7 100644
--- a/src/DotRecast.Detour/DtLink.cs
+++ b/src/DotRecast.Detour/DtLink.cs
@@ -27,12 +27,11 @@ namespace DotRecast.Detour
     /// @see dtMeshTile
     public class DtLink
     {
-        public readonly int index; // DtMeshTile.links array index
         public long refs; //< Neighbour reference. (The neighbor that is linked to.)
         public int next; //< Index of the next link.
-        public int edge; //< Index of the polygon edge that owns this link.
-        public int side; //< If a boundary link, defines on which side the link is.
-        public int bmin; //< If a boundary link, defines the minimum sub-edge area.
-        public int bmax; //< If a boundary link, defines the maximum sub-edge area.
+        public byte edge; //< Index of the polygon edge that owns this link.
+        public byte side; //< If a boundary link, defines on which side the link is.
+        public byte bmin; //< If a boundary link, defines the minimum sub-edge area.
+        public byte bmax; //< If a boundary link, defines the maximum sub-edge area.
     }
 }
\ No newline at end of file
diff --git a/src/DotRecast.Detour/DtNavMesh.cs b/src/DotRecast.Detour/DtNavMesh.cs
index e1cc0ea..ec67835 100644
--- a/src/DotRecast.Detour/DtNavMesh.cs
+++ b/src/DotRecast.Detour/DtNavMesh.cs
@@ -587,7 +587,7 @@ namespace DotRecast.Detour
                     int idx = AllocLink(tile);
                     DtLink link = tile.links[idx];
                     link.refs = @base | (long)(poly.neis[j] - 1);
-                    link.edge = j;
+                    link.edge = (byte)j;
                     link.side = 0xff;
                     link.bmin = link.bmax = 0;
                     // Add to linked list.
@@ -684,8 +684,8 @@ namespace DotRecast.Detour
                         {
                             DtLink link = tile.links[idx];
                             link.refs = connectPoly.refs;
-                            link.edge = j;
-                            link.side = dir;
+                            link.edge = (byte)j;
+                            link.side = (byte)dir;
 
                             link.next = poly.firstLink;
                             poly.firstLink = idx;
@@ -704,8 +704,8 @@ namespace DotRecast.Detour
                                     tmax = temp;
                                 }
 
-                                link.bmin = (int)MathF.Round(Math.Clamp(tmin, 0.0f, 1.0f) * 255.0f);
-                                link.bmax = (int)MathF.Round(Math.Clamp(tmax, 0.0f, 1.0f) * 255.0f);
+                                link.bmin = (byte)MathF.Round(Math.Clamp(tmin, 0.0f, 1.0f) * 255.0f);
+                                link.bmax = (byte)MathF.Round(Math.Clamp(tmax, 0.0f, 1.0f) * 255.0f);
                             }
                             else if (dir == 2 || dir == 6)
                             {
@@ -720,8 +720,8 @@ namespace DotRecast.Detour
                                     tmax = temp;
                                 }
 
-                                link.bmin = (int)MathF.Round(Math.Clamp(tmin, 0.0f, 1.0f) * 255.0f);
-                                link.bmax = (int)MathF.Round(Math.Clamp(tmax, 0.0f, 1.0f) * 255.0f);
+                                link.bmin = (byte)MathF.Round(Math.Clamp(tmin, 0.0f, 1.0f) * 255.0f);
+                                link.bmax = (byte)MathF.Round(Math.Clamp(tmax, 0.0f, 1.0f) * 255.0f);
                             }
                         }
                     }
@@ -790,7 +790,7 @@ namespace DotRecast.Detour
                 DtLink link = target.links[idx];
                 link.refs = refs;
                 link.edge = 1;
-                link.side = oppositeSide;
+                link.side = (byte)oppositeSide;
                 link.bmin = link.bmax = 0;
                 // Add to linked list.
                 link.next = targetPoly.firstLink;
@@ -805,7 +805,7 @@ namespace DotRecast.Detour
                     link = tile.links[tidx];
                     link.refs = GetPolyRefBase(target) | (long)targetCon.poly;
                     link.edge = 0xff;
-                    link.side = (side == -1 ? 0xff : side);
+                    link.side = (byte)(side == -1 ? 0xff : side);
                     link.bmin = link.bmax = 0;
                     // Add to linked list.
                     link.next = landPoly.firstLink;