1 /**************************************************************************
2 * mesh.c -- 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 **************************************************************************/
29 #include <stdlib.h> /* atof(), atoi() */
36 /* initialize the non-array mesh values */
37 void mesh_init(struct mesh *m) {
53 /* return a pointer to a new mesh structure (no data array allocated yet) */
54 struct mesh *(new_mesh)() {
55 struct mesh *mesh_ptr;
57 mesh_ptr = (struct mesh *)malloc(sizeof(struct mesh));
59 if ( mesh_ptr == 0 ) {
60 printf("Virtual memory exceeded\n");
64 mesh_ptr->cur_row = 0;
65 mesh_ptr->cur_col = 0;
71 /* return a pointer to a dynamically allocated array */
72 float *(new_mesh_data)(int nrows, int ncols) {
75 mesh_data_ptr = (float *)malloc(nrows * ncols * sizeof(float));
77 if ( mesh_data_ptr == 0 ) {
78 printf("Virtual memory exceeded\n");
82 printf("Allocated float(%d, %d)\n", nrows, ncols);
84 return(mesh_data_ptr);
88 /* set the option name in the mesh data structure */
89 void mesh_set_option_name(struct mesh *m, char *name) {
90 if ( strlen(name) < MAX_IDENT_LEN ) {
91 strcpy(m->option_name, name);
93 strncpy(m->option_name, name, MAX_IDENT_LEN - 1);
94 m->option_name[MAX_IDENT_LEN - 1] = '\0';
96 if ( strcmp(m->option_name, "do_data") == 0 ) {
104 /* set an option value in the mesh data structure */
105 void mesh_set_option_value(struct mesh *m, char *value) {
106 /* printf("Setting %s to %s\n", m->option_name, value); */
109 /* mesh data is a pseudo 2d array */
110 /* printf("Setting mesh_data[%d][%d] to %s\n", m->cur_row, m->cur_col,
112 m->mesh_data[m->cur_row * m->rows + m->cur_col] = atof(value);
114 if ( m->cur_col >= m->cols ) {
117 if ( m->cur_row > m->rows ) {
121 } else if ( strcmp(m->option_name, "origin_lon") == 0 ) {
122 m->originx = atof(value);
123 } else if ( strcmp(m->option_name, "origin_lat") == 0 ) {
124 m->originy = atof(value);
125 } else if ( strcmp(m->option_name, "rows") == 0 ) {
126 m->rows = atoi(value);
127 } else if ( strcmp(m->option_name, "cols") == 0 ) {
128 m->cols = atoi(value);
129 } else if ( strcmp(m->option_name, "row_step") == 0 ) {
130 m->row_step = atof(value);
131 } else if ( strcmp(m->option_name, "col_step") == 0 ) {
132 m->col_step = atof(value);
134 printf("Unknown option %s with value %s, ignoring ...\n",
135 m->option_name, value);
140 /* do whatever needs to be done with the mesh now that it's been
141 loaded, such as generating the OpenGL call list. */
142 void mesh_do_it(struct mesh *m) {
148 /* Revision 1.5 1997/06/22 21:44:41 curt
149 /* Working on intergrating the VRML (subset) parser.
151 * Revision 1.4 1997/05/30 19:30:17 curt
152 * The LaRCsim flight model is starting to look like it is working.
154 * Revision 1.3 1997/05/23 15:40:41 curt
155 * Added GNU copyright headers.
157 * Revision 1.2 1997/05/19 18:20:50 curt
158 * Slight change to origin key words.
160 * Revision 1.1 1997/05/16 16:07:04 curt