text: //////////////////////////////////////////////////////////////////////////
  //
  //  Copyright (c) 2013, Image Engine Design Inc. All rights reserved.
  //
  //  Redistribution and use in source and binary forms, with or without
  //  modification, are permitted provided that the following conditions are
  //  met:
  //
  //     * Redistributions of source code must retain the above copyright
  //       notice, this list of conditions and the following disclaimer.
  //
  //     * Redistributions in binary form must reproduce the above copyright
  //       notice, this list of conditions and the following disclaimer in the
  //       documentation and/or other materials provided with the distribution.
  //
  //     * Neither the name of Image Engine Design nor the names of any
  //       other contributors to this software may be used to endorse or
  //       promote products derived from this software without specific prior
  //       written permission.
  //
  //  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  //  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  //  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  //  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  //  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  //  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  //  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  //  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  //  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  //  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  //  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  //
  //////////////////////////////////////////////////////////////////////////
  
  /// GUI_PrimitiveHooks are used in Houdini 12.5, but do not exist in earlier versions.
  /// Check GR_Cortex.h for Cortex viewport rendering in Houdini 12.0.
  #include "UT/UT_Version.h"
  #if UT_MAJOR_VERSION_INT > 12 || UT_MINOR_VERSION_INT >= 5
  
  #ifndef IECOREHOUDINI_GUICORTEXPRIMITIVEHOOK_H
  #define IECOREHOUDINI_GUICORTEXPRIMITIVEHOOK_H
  
  #include "GUI/GUI_PrimitiveHook.h"
  #include "ieHoudini.h"
  
  namespace IECoreHoudini
  {
  
  /// Hook for drawing GU_CortexPrimitives in OpenGL
  class CortexHOUAPI GUI_CortexPrimitiveHook : public GUI_PrimitiveHook
  {
  	public :
  		
  		GUI_CortexPrimitiveHook();
  		virtual ~GUI_CortexPrimitiveHook();
  		
  		virtual GR_Primitive *createPrimitive( const GT_PrimitiveHandle &gt_prim, const GEO_Primitive *geo_prim, const GR_RenderInfo *info, const char *cache_name, GR_PrimAcceptResult &processed );
  
  };
  
  } // namespace IECoreHoudini
  
  #endif // IECOREHOUDINI_GUICORTEXPRIMITIVEHOOK_H
  
  #endif // 12.5 or later
  
  