tessellate.h

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/*! \file
  \brief  Tesselator functions.  Allows tesselation of complex polygons into simple ones.

  \par Copyright Information

  Copyright (c) 2015 by The DiSTI Corporation.<br>
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  NO WARRANTY. THE SOFTWARE IS PROVIDED "AS-IS," WITHOUT WARRANTY OF ANY KIND,
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*/
#ifndef __TESSELLATE_H
#define __TESSELLATE_H

#include "gls_include.h"
#include "dynamic_array.h"

// copied from gui_defs.h
#define ID_TESSELLATE_SINGLE     340
#define ID_TESSELLATE_UNION      341
#define ID_TESSELLATE_INTERSECT  342
#define ID_TESSELLATE_DIFFERENCE 343

namespace disti
{

typedef DisplayObject* (*CreateGroupFunc)();
typedef DisplayObject* (*CreatePolyFunc)();
typedef Group* (*DecomposeFunc)(DisplayObject*);

/**
  Tesselator functions.  Implements polygon tessellation.
 */

/** Called by application to perform a CSG operation while tesselating one group of objects.
  * \param obj_list Pointer to group of objects to tessellate
  * \return  Pointer to the group of the polygons generated during tesselation.
  * The polygons will all be 2, or 3 vertices no more!
  */
GLS_EXPORT Group *Tessellate(Group *obj_list, CreateGroupFunc, CreatePolyFunc, DecomposeFunc);


/** Called by application to perform a CSG operation while tesselating two objects.
 * \param object_list List containing the two objects to tessellate
 * \param tesstype The operation to perform (union, intersect, subtract)
 * \return Pointer to the group of the polygons generated during tesselation
 */

GLS_EXPORT Group *Tessellate(Group *object_list, int tesstype, CreateGroupFunc, CreatePolyFunc, DecomposeFunc);

/** Called by application to perform a CSG operation on a character glyph
  * \param obj_list Pointer to group of objects to tessellate
  * \return  Pointer to the group of the polygons generated during tesselation.
  * The polygons will have OpenGl drawing primatives, e.g. TRIANGLE_FAN as 
  * generated by the tessellator
  */
GLS_EXPORT Group *TessellateGlyph(Group *obj_list, CreateGroupFunc, CreatePolyFunc, DecomposeFunc);

} // namespace disti

#endif