gl2ps.h

/*
 * GL2PS, an OpenGL to Postscript Printing Library, version 0.31
 * Copyright (C) 1999-2000  Christophe Geuzaine
 *
 * Last Mod by Christophe on Mon Aug 14 23:49:47 2000
 *
 * E-mail: Christophe.Geuzaine@AdValvas.be
 * URL: http://www.geuz.org/gl2ps/
 *
 * 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.
 *
 */

#ifndef __GL2PS_H__
#define __GL2PS_H__

#include <stdio.h>
#include <stdlib.h>
#include <GL/gl.h>

#define GL2PS_NONE                       0

/* Sorting algorithms */

#define GL2PS_NO_SORT                    1
#define GL2PS_SIMPLE_SORT                2
#define GL2PS_BSP_SORT                   3

/* Options for gl2psBeginPage */

#define GL2PS_DRAW_BACKGROUND            1
#define GL2PS_SIMPLE_LINE_OFFSET         2
#define GL2PS_SILENT                     4
#define GL2PS_BEST_ROOT                  8
#define GL2PS_OCCLUSION_CULL             16

/* Arguments for gl2psEnable/gl2psDisable */

#define GL2PS_POLYGON_OFFSET_FILL        1
#define GL2PS_POLYGON_BOUNDARY           2
#define GL2PS_LINE_STIPPLE               3

/* Magic numbers */

#define GL2PS_EPSILON                    5.e-3

/* Message levels */

#define GL2PS_INFO                       1
#define GL2PS_WARNING                    2
#define GL2PS_ERROR                      3

/* Error codes */

#define GL2PS_SUCCESS                    0
#define GL2PS_NO_FEEDBACK               -1
#define GL2PS_OVERFLOW                  -2

/* Primitive types */

#define GL2PS_TEXT                       1
#define GL2PS_POINT                      2
#define GL2PS_LINE                       3
#define GL2PS_QUADRANGLE                 4
#define GL2PS_TRIANGLE                   5

/* BSP tree primitive comparison */

#define GL2PS_COINCIDENT                 1
#define GL2PS_IN_FRONT_OF                2
#define GL2PS_IN_BACK_OF                 3
#define GL2PS_SPANNING                   4

/* Pass through options */

#define GL2PS_BEGIN_POLYGON_OFFSET_FILL  1
#define GL2PS_END_POLYGON_OFFSET_FILL    2
#define GL2PS_BEGIN_POLYGON_BOUNDARY     3
#define GL2PS_END_POLYGON_BOUNDARY       4
#define GL2PS_BEGIN_LINE_STIPPLE         5
#define GL2PS_END_LINE_STIPPLE           6

typedef GLfloat GL2PSrgba[4];
typedef GLfloat GL2PSxyz[3];
typedef GLfloat GL2PSxy[2];
typedef GLfloat GL2PSplane[4];

typedef struct {
  GLint nmax, size, incr, n;
  char *array;
} GL2PSlist;

typedef struct _GL2PSbsptree GL2PSbsptree;

struct _GL2PSbsptree {
  GL2PSplane plane;
  GL2PSlist *primitives;
  GL2PSbsptree *front, *back;
};

typedef struct _GL2PSbsptree2d GL2PSbsptree2d;

struct _GL2PSbsptree2d {
  GLshort flag;
  GL2PSxy a, b;
  GL2PSbsptree2d *front, *back;
};

typedef struct {
  GL2PSxyz xyz;
  GL2PSrgba rgba;
} GL2PSvertex;

typedef struct {
  GLshort fontsize;
  char *str, *fontname;
} GL2PSstring;

typedef struct {
  GLshort type, numverts, boundary;
  GLfloat depth;
  GLint dash;
  GL2PSvertex *verts;
  GL2PSstring *text;
} GL2PSprimitive;

typedef struct {
  GLint sort, options, colorsize, colormode, buffersize;
  char *title, *producer;
  GLboolean shade, boundary;
  GLfloat *feedback, offset[2];
  GL2PSrgba *colormap;
  GL2PSlist *primitives;
  FILE *stream;
} GL2PScontext;


/* public functions */

GLvoid gl2psBeginPage(char *title, char *producer, GLint sort, GLint options, 
		      GLint colormode, GLint colorsize, GL2PSrgba *colormap, 
		      GLint buffersize, FILE * stream);
GLint  gl2psEndPage(GLvoid);
GLvoid gl2psText(char *str, char *fontname, GLint size);
GLvoid gl2psEnable(GLint mode);
GLvoid gl2psDisable(GLint mode);

#endif