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Vertex caching scheme

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I'm working on a 3d engine and currently designing/implementing the renderer. I've got an idea about a vertex caching scheme and want to hear what you think. The idea is that the renderer automaticly takes care of the caching of vertex data in vertex buffers when geometry is drawn. A queue keep information about eached cached vertex data. The pseudo code for drawing a geometry might look like:
if vertex data is cached
   bubble buffer information in queue one step to the back
else
   if vertex buffer full
      remove vertex data from the buffer that is drawn infrequently (information 
      about those found at the front of the queue)

   put vertex data in buffer
   put buffer information at the back of the queue

draw vertex data from buffer

What do you think?

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