.

Engine/src/Graphics/Render/Mesh/MeshRenderer.cs

@@ -17,6 +17,9 @@ public class MeshRenderer(Asset.Mesh.Mesh parMesh, int parInstanceCount, Program
   private readonly TextureUnitMap _textureUnitMap = new(16);
   private readonly int[] _textureUnitIndices = new int[16];
 
+  private int _frameHash;
+  private int _previousHash;
+
   public void Commit(Matrix4 parModelMatrix, Texture.Texture? parTexture = null)
   {
     if (_queuedInstanceCount >= _instanceCount)
@@ -32,6 +35,9 @@ public class MeshRenderer(Asset.Mesh.Mesh parMesh, int parInstanceCount, Program
 
     _instanceVertices[_queuedInstanceCount]._textureId = textureId;
     _instanceVertices[_queuedInstanceCount]._modelMatrix = parModelMatrix;
+
+    _frameHash = HashCode.Combine(_frameHash, _instanceVertices[_queuedInstanceCount]);
+
     _queuedInstanceCount++;
   }
 
@@ -45,4 +51,17 @@ public class MeshRenderer(Asset.Mesh.Mesh parMesh, int parInstanceCount, Program
 
     parProgram.SetUniform("uTexture", _textureUnitIndices);
   }
+
+  protected override bool DataChanged()
+  {
+    return _frameHash != _previousHash;
+  }
+
+  public override void Reset()
+  {
+    base.Reset();
+    _textureUnitMap.Reset();
+    _previousHash = _frameHash;
+    _frameHash = 0;
+  }
 }