135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/**************************************************************************
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* geometry.c -- data structures and routines for processing vrml geometry
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*
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* Written by Curtis Olson, started June 1997.
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*
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* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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* (Log is kept at end of this file)
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**************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "geometry.h"
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#include "mesh.h"
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static vrmlGeometryType;
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struct mesh eg;
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/* Begin a new vrml geometry statement */
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int vrmlInitGeometry(char *type) {
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printf("Beginning geometry item = %s\n", type);
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if ( strcmp(type, "ElevationGrid") == 0 ) {
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vrmlGeometryType = VRML_ELEV_GRID;
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mesh_init(&eg);
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} else {
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vrmlGeometryType = -1;
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printf("Unimplemented geometry type = %s\n", type);
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}
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return(vrmlGeometryType);
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}
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/* Set current vrml geometry option name */
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void vrmlGeomOptionName(char *name) {
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/* printf("Found vrml geometry option = %s\n", name); */
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switch(vrmlGeometryType) {
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case VRML_ELEV_GRID:
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if ( strcmp(name, "xOrigin") == 0 ) {
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mesh_set_option_name(&eg, "origin_lon");
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} else if ( strcmp(name, "zOrigin") == 0 ) {
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mesh_set_option_name(&eg, "origin_lat");
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} else if ( strcmp(name, "xDimension") == 0 ) {
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mesh_set_option_name(&eg, "rows");
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} else if ( strcmp(name, "zDimension") == 0 ) {
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mesh_set_option_name(&eg, "cols");
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} else if ( strcmp(name, "xSpacing") == 0 ) {
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mesh_set_option_name(&eg, "row_step");
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} else if ( strcmp(name, "zSpacing") == 0 ) {
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mesh_set_option_name(&eg, "col_step");
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} else if ( strcmp(name, "height") == 0 ) {
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eg.mesh_data = new_mesh_data(eg.rows, eg.cols);
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mesh_set_option_name(&eg, "do_data");
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} else {
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printf("Unknown ElevationGrid option = %s\n", name);
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}
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break;
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}
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}
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/* Set current vrml geometry value */
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void vrmlGeomOptionsValue(char *value) {
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/* printf("Found vrml geometry value = %s\n", value); */
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switch(vrmlGeometryType) {
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case VRML_ELEV_GRID:
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mesh_set_option_value(&eg, value);
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}
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}
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/* We've finished parsing the current geometry. Now do whatever needs
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* to be done with it (like generating the OpenGL call list for
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* instance */
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void vrmlHandleGeometry() {
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switch(vrmlGeometryType) {
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case VRML_ELEV_GRID:
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mesh_do_it(&eg);
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}
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}
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/* Finish up the current vrml geometry statement */
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int vrmlFreeGeometry() {
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printf("Freeing geometry type = %d\n", vrmlGeometryType);
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switch(vrmlGeometryType) {
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case VRML_ELEV_GRID:
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/* We need to rethink this here, we can't just free the data,
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* because we need it to calculate current ground elevation
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* ... */
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/* free(eg.mesh_data); */
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}
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return(vrmlGeometryType);
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}
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/* $Log$
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/* Revision 1.3 1997/07/08 18:20:13 curt
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/* Working on establishing a hard ground.
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/*
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* Revision 1.2 1997/07/07 20:59:51 curt
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* Working on scenery transformations to enable us to fly fluidly over the
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* poles with no discontinuity/distortion in scenery.
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*
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* Revision 1.1 1997/06/29 21:16:48 curt
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* More twiddling with the Scenery Management system.
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*
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* Revision 1.1 1997/06/22 21:42:35 curt
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* Initial revision of VRML (subset) parser.
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*
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*/
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