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and adding the requisite accessors
Note : all our example code goes through the same boiler-plate texture
binding code - we might want to move it as a member function of the DrawContext.
Cleanup the batching classes so that DrawCollection() no longer caches
current batch and effect. Any kind of binding optimization will be
handled in client's delegate class.
Also remove InitializeVertexBuffer method and add some arguments to
constructor instead.
