From 0444c66e01f6130afe2b5d05f19cbaf3485c8a99 Mon Sep 17 00:00:00 2001
From: Kythyria Tieran <kythyria@berigora.net>
Date: Mon, 14 Jun 2021 22:55:16 +0100
Subject: [PATCH] Throw on errors caused by overlarge meshes.

---
 PD2ModelParser/Importers/GltfImporter.cs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/PD2ModelParser/Importers/GltfImporter.cs b/PD2ModelParser/Importers/GltfImporter.cs
index f854920..901fd82 100644
--- a/PD2ModelParser/Importers/GltfImporter.cs
+++ b/PD2ModelParser/Importers/GltfImporter.cs
@@ -460,6 +460,13 @@ public void AppendVertices(IEnumerable<Vertex> vertices)
 
             public static MeshData FromGltfMesh(GLTF.Mesh mesh)
             {
+
+                var vcount = mesh.Primitives.Select(prim => prim.VertexAccessors["POSITION"].Count).Sum();
+                if (vcount >= ushort.MaxValue)
+                {
+                    throw new Exception($"Too many vertices ({vcount}) in mesh {mesh.Name}. Limit is 65535");
+                }
+
                 var attribsUsed = mesh.Primitives.First().VertexAccessors.Select(i => i.Key).OrderBy(i => i);
                 var ok = mesh.Primitives.Select(i => i.VertexAccessors.Keys.OrderBy(j => j)).Aggregate(true, (acc, curr) => acc && curr.SequenceEqual(attribsUsed));
                 if (!ok)