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/*
* Mesa 3-D graphics library
* Version: 3.3
* Copyright (C) 1995-2000 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.
*/
/*
* 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;
typedef struct callbacks_str
{
void (GLCALLBACK * begin) (GLenum mode);
void (GLCALLBACK * edgeFlag) (GLboolean flag);
void (GLCALLBACK * vertex) (GLvoid * v);
void (GLCALLBACK * end) (void);
void (GLCALLBACK * error) (GLenum err);
}
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 GLUtesselator
{
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);
extern void tess_test_polygon(GLUtriangulatorObj *);
extern void tess_find_contour_hierarchies(GLUtriangulatorObj *);
extern void tess_handle_holes(GLUtriangulatorObj *);
extern void tess_tesselate(GLUtriangulatorObj *);
extern void tess_tesselate_with_edge_flag(GLUtriangulatorObj *);
#endif
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