/*
  RENDER-INVOCATION.hpp  -  initiate the rendering of a single frame

  Copyright (C)         Lumiera.org
    2009,               Hermann Vosseler <Ichthyostega@web.de>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of
  the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

/** @file render-invocation.hpp
 ** Initiate a single calculation unit within the renderengine.
 ** Usually, this will cause the rendering of a single frame or sub-frame.
 **
 ** @see engine::ProcNode
 ** @see State
 ** @see node-basic-test.cpp
 **
 */

#ifndef ENGINE_RENDER_INVOCATION_H
#define ENGINE_RENDER_INVOCATION_H


//#include "proc/state.hpp"
#include "proc/engine/procnode.hpp"
#include "proc/engine/buffhandle.hpp"
//#include "proc/engine/bufftable-obsolete.hpp"




namespace engine {
  
  
  /**
   * TODO: type comment
   */
  class RenderInvocation
    {
      ProcNode* theNode_;
      
    public:
      RenderInvocation (ProcNode* exitNode)
        : theNode_(exitNode)
        {
          REQUIRE (theNode_);
        }
      
      size_t size() { return theNode_->nrO(); }
      
      /** pull calculated data from the N-th node output channel */
      BuffHandle operator[] (size_t channel);
      
      
      
    };
  
  ///////////////////////////////////TODO: currently just fleshing out the API
  
  
  
  
  
} // namespace engine
#endif