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engine/ipooledvballocator.h

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Revision: $
+// $NoKeywords: $
+//
+// This file contains a little interface to deal with pooled vertex buffer allocations
+// (which is used to allow multiple meshes to own sub-ranges within a single vertex buffer)
+//
+//=============================================================================//
+
+#ifndef IPOOLEDVBALLOCATOR_H
+#define IPOOLEDVBALLOCATOR_H
+
+//-----------------------------------------------------------------------------
+// Pooled VB allocator abstract base class
+//-----------------------------------------------------------------------------
+abstract_class IPooledVBAllocator
+{
+public:
+
+	virtual ~IPooledVBAllocator() {};
+
+	// Allocate the shared vertex buffer
+	virtual bool			Init( VertexFormat_t format, int numVerts ) = 0;
+	// Free the shared vertex buffer (after Deallocate is called for all sub-allocs)
+	virtual void			Clear() = 0;
+
+	// Get the shared mesh (vertex buffer) from which sub-allocations are made
+	virtual IMesh			*GetSharedMesh() = 0;
+
+	// Get a pointer to the start of the vertex buffer data
+	virtual void			*GetVertexBufferBase() = 0;
+	virtual int				GetNumVertsAllocated() = 0; 
+
+	// Allocate a sub-range of 'numVerts' from free space in the shared vertex buffer
+	// (returns the byte offset from the start of the VB to the new allocation)
+	virtual int				Allocate( int numVerts ) = 0;
+	virtual void			Deallocate( int offset, int numVerts ) = 0;
+};
+
+
+#endif	// IPOOLEDVBALLOCATOR_H