1 /**************************************************************************
2 * mesh.h -- data structures and routines for processing terrain meshes
4 * Written by Curtis Olson, started May 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
35 /* start coordinates (in arc seconds) */
36 double originx, originy;
38 /* number of rows and columns */
41 /* Distance between row and column data points (in arc seconds) */
42 double row_step, col_step;
44 /* pointer to the actual mesh data dynamically allocated */
47 /* a temporary values for the parser to use */
54 /* return a pointer to a new mesh structure (no data array allocated yet) */
55 struct MESH *(new_mesh)( void );
57 /* initialize the non-array mesh values */
58 void mesh_init(struct MESH *m);
60 /* return a pointer to a dynamically allocated array */
61 float *(new_mesh_data)(int nrows, int ncols);
63 /* set the option name in the mesh data structure */
64 void mesh_set_option_name(struct MESH *m, char *name);
66 /* set an option value in the mesh data structure */
67 void mesh_set_option_value(struct MESH *m, char *value);
69 /* do whatever needs to be done with the mesh now that it's been
70 * loaded, such as generating the OpenGL call list. */
71 void mesh_do_it(struct MESH *m);
73 /* return the current altitude based on mesh data. We should rewrite
74 * this to interpolate exact values, but for now this is good enough */
75 double mesh_altitude(double lon, double lat);
77 /* walk through mesh and make opengl calls */
78 GLint mesh_to_OpenGL(struct MESH *m);
85 /* Revision 1.9 1998/01/22 02:59:41 curt
86 /* Changed #ifdef FILE_H to #ifdef _FILE_H
88 * Revision 1.8 1998/01/19 18:40:37 curt
89 * Tons of little changes to clean up the code and to remove fatal errors
90 * when building with the c++ compiler.
92 * Revision 1.7 1997/08/27 03:30:29 curt
93 * Changed naming scheme of basic shared structures.
95 * Revision 1.6 1997/08/02 19:10:15 curt
96 * Incorporated mesh2GL.c into mesh.c
98 * Revision 1.5 1997/07/23 21:52:25 curt
99 * Put comments around the text after an #endif for increased portability.
101 * Revision 1.4 1997/07/08 18:20:14 curt
102 * Working on establishing a hard ground.
104 * Revision 1.3 1997/06/22 21:44:41 curt
105 * Working on intergrating the VRML (subset) parser.
107 * Revision 1.2 1997/05/23 15:40:42 curt
108 * Added GNU copyright headers.
110 * Revision 1.1 1997/05/16 16:07:05 curt