/* $Id: tess.h,v 1.3 1997/10/29 02:02:20 brianp Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  2.3
 * Copyright (C) 1995-1997  Brian Paul
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


/*
 * $Log: tess.h,v $
 * Revision 1.3  1997/10/29 02:02:20  brianp
 * various MS Windows compiler changes (David Bucciarelli, v20 3dfx driver)
 *
 * Revision 1.2  1997/05/24 13:30:58  brianp
 * added TESS_H multi-inclusion prevention test
 *
 * Revision 1.1  1996/09/27 01:19:39  brianp
 * Initial revision
 *
 */


/*
 * This file is part of the polygon tesselation code contributed by
 * Bogdan Sikorski
 */


#ifndef TESS_H
#define TESS_H


#include "gluP.h"

#define EPSILON 1e-06 /* epsilon for double precision compares */

typedef enum
{
	OXY,
	OYZ,
	OXZ
} projection_type;

#if defined(AMIGA) && defined(__PPC__)
void beginPPC( GLenum mode );
void edgeFlagPPC( GLboolean flag );
void vertexPPC( GLvoid *v );
void endPPC( void );
void errorPPC( GLenum err );
#endif

typedef struct callbacks_str
{
	void (CALLBACK *begin)( GLenum mode );
	void (CALLBACK *edgeFlag)( GLboolean flag );
	void (CALLBACK *vertex)( GLvoid *v );
	void (CALLBACK *end)( void );
	void (CALLBACK *error)( GLenum err );
#if defined(AMIGA) && defined(__PPC__)
	void (CALLBACK *beginPPC)( GLenum mode );
	void (CALLBACK *edgeFlagPPC)( GLboolean flag );
	void (CALLBACK *vertexPPC)( GLvoid *v );
	void (CALLBACK *endPPC)( void );
	void (CALLBACK *errorPPC)( GLenum err );
#endif
} tess_callbacks;

typedef struct vertex_str
{
	void                            *data;
	GLdouble                        location[3];
	GLdouble                        x,y;
	GLboolean                       edge_flag;
	struct vertex_str       *shadow_vertex;
	struct vertex_str       *next,*previous;
} tess_vertex;

typedef struct contour_str
{
	GLenum                          type;
	GLuint                          vertex_cnt;
	GLdouble                        area;
	GLenum                          orientation;
	struct vertex_str       *vertices,*last_vertex;
	struct contour_str      *next,*previous;
} tess_contour;

typedef struct polygon_str
{
	GLuint                          vertex_cnt;
	GLdouble                        A,B,C,D;
	GLdouble                        area;
	GLenum                          orientation;
	struct vertex_str       *vertices,*last_vertex;
} tess_polygon;

struct GLUtriangulatorObj
{
	tess_contour            *contours,*last_contour;
	GLuint                          contour_cnt;
	tess_callbacks          callbacks;
	tess_polygon            *current_polygon;
	GLenum                          error;
	GLdouble                        A,B,C,D;
	projection_type         projection;
};


extern void tess_call_user_error(GLUtriangulatorObj *,GLenum);


#endif