UPBGE: Use memory pool to allocate vertex data.

Currently in the conversion vertex data are always allocated,
checked for redundant then maybe copied and free.
To avoid frequently allocation a memory pool is used for
each display array type, this memory pool is a boost::object_pool.

Tested with sintel desert_level.blend file:
Before: 0.85s
After: 0.82s

Author: panzergame

source/gameengine/Converter/BL_BlenderDataConversion.cpp

@@ -589,6 +589,9 @@ void BL_ConvertDerivedMeshToArray(DerivedMesh *dm, Mesh *me, const std::vector<B
 				sharedList.push_back({array, offset});
 			}
 
+			// Destruct the vertex data as it is copied or unused.
+			array->DeleteVertexData(vertex);
+
 			// Add tracked vertices by the mpoly.
 			vertices[vertid] = offset;
 		}

source/gameengine/Rasterizer/RAS_DisplayArray.h

@@ -29,6 +29,8 @@
 
 #include "RAS_IDisplayArray.h"
 
+#include "boost/pool/object_pool.hpp"
+
 template <class VertexData>
 class RAS_BatchDisplayArray;
 
@@ -41,6 +43,9 @@ friend class RAS_BatchDisplayArray<VertexData>;
 protected:
 	std::vector<VertexData> m_vertexes;
 
+	// Temporary vertex data storage.
+	static boost::object_pool<VertexData> m_vertexPool;
+
 public:
 	RAS_DisplayArray(PrimitiveType type, const RAS_VertexFormat& format)
 		:RAS_IDisplayArray(type, format)
@@ -109,14 +114,18 @@ friend class RAS_BatchDisplayArray<VertexData>;
 		return m_vertexes.data();
 	}
 
-	virtual unsigned int AddVertex(RAS_Vertex& vert)
+	virtual unsigned int AddVertex(const RAS_Vertex& vert)
 	{
 		VertexData *data = static_cast<VertexData *>(vert.GetData());
 		m_vertexes.push_back(*data);
-		delete data;
 		return m_vertexes.size() - 1;
 	}
 
+	virtual void DeleteVertexData(const RAS_Vertex& vert)
+	{
+		m_vertexPool.destroy(static_cast<VertexData *>(vert.GetData()));
+	}
+
 	virtual void Clear()
 	{
 		m_vertexes.clear();
@@ -139,7 +148,7 @@ friend class RAS_BatchDisplayArray<VertexData>;
 				const unsigned int *rgba,
 				const MT_Vector3& normal)
 	{
-		VertexData *data = new VertexData(xyz, uvs, tangent, rgba, normal);
+		VertexData *data = new (m_vertexPool.malloc()) VertexData(xyz, uvs, tangent, rgba, normal);
 		return RAS_Vertex(data, m_format);
 	}
 
@@ -150,7 +159,7 @@ friend class RAS_BatchDisplayArray<VertexData>;
 				const unsigned int *rgba,
 				const float normal[3])
 	{
-		VertexData *data = new VertexData(xyz, uvs, tangent, rgba, normal);
+		VertexData *data = new (m_vertexPool.malloc()) VertexData(xyz, uvs, tangent, rgba, normal);
 		return RAS_Vertex(data, m_format);
 	}
 
@@ -164,4 +173,7 @@ friend class RAS_BatchDisplayArray<VertexData>;
 	}
 };
 
+template <class VertexData>
+boost::object_pool<VertexData> RAS_DisplayArray<VertexData>::m_vertexPool;
+
 #endif  // __RAS_DISPLAY_ARRAY_H__

source/gameengine/Rasterizer/RAS_IDisplayArray.h

@@ -121,7 +121,9 @@ class RAS_IDisplayArray
 		return m_vertexInfos[index];
 	}
 
-	virtual unsigned int AddVertex(RAS_Vertex& vert) = 0;
+	virtual unsigned int AddVertex(const RAS_Vertex& vert) = 0;
+
+	virtual void DeleteVertexData(const RAS_Vertex& vert) = 0;
 
 	inline void AddPrimitiveIndex(const unsigned int index)
 	{