From 15740faf9fe9fe4be08965098bbf2947e096aeeb Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Wed, 14 Aug 2019 22:50:43 +0800
Subject: +Unity Runtime code

---
 Runtime/Dynamics/ExtractDataFromMesh.cpp | 56 ++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 Runtime/Dynamics/ExtractDataFromMesh.cpp

(limited to 'Runtime/Dynamics/ExtractDataFromMesh.cpp')

diff --git a/Runtime/Dynamics/ExtractDataFromMesh.cpp b/Runtime/Dynamics/ExtractDataFromMesh.cpp
new file mode 100644
index 0000000..a2cd9f4
--- /dev/null
+++ b/Runtime/Dynamics/ExtractDataFromMesh.cpp
@@ -0,0 +1,56 @@
+#include "UnityPrefix.h"
+#include "ExtractDataFromMesh.h"
+#include "Runtime/Filters/Mesh/LodMesh.h"
+#include "Runtime/Math/Vector3.h"
+#include "Runtime/Misc/MeshWelding.h"
+#include "Runtime/Graphics/TriStripper.h"
+
+///@TODO: Use dynamic_array temp allocator
+// Extracts unique welded vertices & triangle array indexing into the welded vertices.
+bool ExtractDataFromMesh (Mesh& mesh, dynamic_array<Vector3f>& vertices, dynamic_array<UInt16>& triangles, dynamic_array<UInt16>& remap)
+{
+	int vertexCount = mesh.GetVertexCount();
+	if (vertexCount == 0)
+		return false;
+
+	if (!mesh.HasVertexData())
+	{
+		ErrorStringObject("CollisionMeshData couldn't be created because the mesh has been marked as non-accessible", &mesh);
+		return false;
+	}
+	
+    vertices.resize_uninitialized(vertexCount);
+	mesh.ExtractVertexArray(&vertices[0]);
+		
+    triangles.clear();
+    for (unsigned submesh=0; submesh<mesh.GetSubMeshCount(); submesh++)
+    {
+        if (submesh >= mesh.GetSubMeshCount())
+        {
+            ErrorString("Failed getting triangles. Submesh index is out of bounds.");
+            return false;
+        }
+        
+		UInt16* indices = mesh.GetSubMeshBuffer16(submesh);
+		SubMesh& sm = mesh.GetSubMeshFast(submesh);
+		if (sm.topology == kPrimitiveTriangleStripDeprecated)
+        {
+			const UInt32 startIndex = triangles.size();
+			int triCount = CountTrianglesInStrip (indices, sm.indexCount);
+			triangles.resize_uninitialized((triCount * 3) + startIndex);
+            Destripify(indices, sm.indexCount, triangles.begin() + startIndex, triCount);
+        }
+        else if (sm.topology == kPrimitiveTriangles)
+		{
+            triangles.insert(triangles.end(), indices, indices + sm.indexCount);
+		}
+		else
+		{
+			ErrorString("Failed to extract collision data: non-triangle mesh.");
+			return false;
+		}
+    }
+
+    WeldVertexArray(vertices, triangles, remap);
+	return true;
+}
\ No newline at end of file
-- 
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