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