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/* $Id: tess.h,v 1.1 2003-02-28 11:42:08 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  3.3
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 * Copyright (C) 1995-2000  Brian Paul
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Library General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Library General Public License for more details.
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 *
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 * You should have received a copy of the GNU Library General Public
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 * License along with this library; if not, write to the Free
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 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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 */
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/*
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 * This file is part of the polygon tesselation code contributed by
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 * Bogdan Sikorski
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 */
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#ifndef TESS_H
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#define TESS_H
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#include "gluP.h"
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#define EPSILON 1e-06           /* epsilon for double precision compares */
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typedef enum
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{
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   OXY,
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   OYZ,
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   OXZ
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}
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projection_type;
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typedef struct callbacks_str
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{
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   void (GLCALLBACK * begin) (GLenum mode);
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   void (GLCALLBACK * edgeFlag) (GLboolean flag);
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   void (GLCALLBACK * vertex) (GLvoid * v);
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   void (GLCALLBACK * end) (void);
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   void (GLCALLBACK * error) (GLenum err);
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}
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tess_callbacks;
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typedef struct vertex_str
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{
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   void *data;
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   GLdouble location[3];
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   GLdouble x, y;
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   GLboolean edge_flag;
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   struct vertex_str *shadow_vertex;
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   struct vertex_str *next, *previous;
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}
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tess_vertex;
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typedef struct contour_str
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{
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   GLenum type;
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   GLuint vertex_cnt;
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   GLdouble area;
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   GLenum orientation;
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   struct vertex_str *vertices, *last_vertex;
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   struct contour_str *next, *previous;
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}
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tess_contour;
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typedef struct polygon_str
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{
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   GLuint vertex_cnt;
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   GLdouble A, B, C, D;
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   GLdouble area;
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   GLenum orientation;
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   struct vertex_str *vertices, *last_vertex;
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}
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tess_polygon;
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struct GLUtesselator
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{
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   tess_contour *contours, *last_contour;
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   GLuint contour_cnt;
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   tess_callbacks callbacks;
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   tess_polygon *current_polygon;
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   GLenum error;
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   GLdouble A, B, C, D;
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   projection_type projection;
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};
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extern void tess_call_user_error(GLUtriangulatorObj *, GLenum);
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extern void tess_test_polygon(GLUtriangulatorObj *);
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extern void tess_find_contour_hierarchies(GLUtriangulatorObj *);
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extern void tess_handle_holes(GLUtriangulatorObj *);
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extern void tess_tesselate(GLUtriangulatorObj *);
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extern void tess_tesselate_with_edge_flag(GLUtriangulatorObj *);
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#endif