221 lines
6.2 KiB
C
221 lines
6.2 KiB
C
/**************************************************************************
|
|
* tilecache.c -- routines to handle scenery tile caching
|
|
*
|
|
* Written by Curtis Olson, started January 1998.
|
|
*
|
|
* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
* License, or (at your option) any later version.
|
|
*
|
|
* This program 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
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* $Id$
|
|
* (Log is kept at end of this file)
|
|
**************************************************************************/
|
|
|
|
|
|
#ifdef WIN32
|
|
# include <windows.h>
|
|
#endif
|
|
|
|
#include <GL/glut.h>
|
|
#include <XGL/xgl.h>
|
|
|
|
#include <Include/general.h>
|
|
#include <Main/fg_debug.h>
|
|
#include <Main/views.h>
|
|
#include <Scenery/bucketutils.h>
|
|
#include <Scenery/obj.h>
|
|
#include <Scenery/tilecache.h>
|
|
|
|
|
|
/* tile cache */
|
|
struct fgTILE tile_cache[FG_TILE_CACHE_SIZE];
|
|
|
|
|
|
/* Initialize the tile cache subsystem */
|
|
void fgTileCacheInit( void ) {
|
|
int i;
|
|
|
|
fgPrintf(FG_TERRAIN, FG_INFO, "Initializing the tile cache.\n");
|
|
|
|
for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
|
|
tile_cache[i].used = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* Search for the specified "bucket" in the cache */
|
|
int fgTileCacheExists( struct fgBUCKET *p ) {
|
|
int i;
|
|
|
|
for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
|
|
if ( tile_cache[i].tile_bucket.lon == p->lon ) {
|
|
if ( tile_cache[i].tile_bucket.lat == p->lat ) {
|
|
if ( tile_cache[i].tile_bucket.x == p->x ) {
|
|
if ( tile_cache[i].tile_bucket.y == p->y ) {
|
|
fgPrintf( FG_TERRAIN, FG_DEBUG,
|
|
"TILE EXISTS in cache ... index = %d\n", i );
|
|
return( i );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return( -1 );
|
|
}
|
|
|
|
|
|
/* Fill in a tile cache entry with real data for the specified bucket */
|
|
void fgTileCacheEntryFillIn( int index, struct fgBUCKET *p ) {
|
|
struct fgGENERAL *g;
|
|
char base_path[256];
|
|
char file_name[256];
|
|
|
|
g = &general;
|
|
|
|
/* Mark this cache entry as used */
|
|
tile_cache[index].used = 1;
|
|
|
|
/* Update the bucket */
|
|
tile_cache[index].tile_bucket.lon = p->lon;
|
|
tile_cache[index].tile_bucket.lat = p->lat;
|
|
tile_cache[index].tile_bucket.x = p->x;
|
|
tile_cache[index].tile_bucket.y = p->y;
|
|
|
|
/* Load the appropriate area and get the display list pointer */
|
|
fgBucketGenBasePath(p, base_path);
|
|
sprintf(file_name, "%s/Scenery/%s/%ld.obj", g->root_dir,
|
|
base_path, fgBucketGenIndex(p));
|
|
tile_cache[index].display_list =
|
|
fgObjLoad(file_name, &tile_cache[index].local_ref,
|
|
&tile_cache[index].bounding_radius);
|
|
}
|
|
|
|
|
|
/* Free a tile cache entry */
|
|
void fgTileCacheEntryFree( int index ) {
|
|
/* Mark this cache entry as un-used */
|
|
tile_cache[index].used = 0;
|
|
|
|
/* Update the bucket */
|
|
fgPrintf( FG_TERRAIN, FG_DEBUG,
|
|
"FREEING TILE = (%d %d %d %d)\n",
|
|
tile_cache[index].tile_bucket.lon,
|
|
tile_cache[index].tile_bucket.lat,
|
|
tile_cache[index].tile_bucket.x,
|
|
tile_cache[index].tile_bucket.y );
|
|
|
|
/* Load the appropriate area and get the display list pointer */
|
|
if ( tile_cache[index].display_list >= 0 ) {
|
|
xglDeleteLists( tile_cache[index].display_list, 1 );
|
|
}
|
|
}
|
|
|
|
|
|
/* Return info for a tile cache entry */
|
|
void fgTileCacheEntryInfo( int index, GLint *display_list,
|
|
struct fgCartesianPoint *local_ref ) {
|
|
*display_list = tile_cache[index].display_list;
|
|
/* fgPrintf(FG_TERRAIN, FG_DEBUG, "Display list = %d\n", *display_list); */
|
|
|
|
local_ref->x = tile_cache[index].local_ref.x;
|
|
local_ref->y = tile_cache[index].local_ref.y;
|
|
local_ref->z = tile_cache[index].local_ref.z;
|
|
}
|
|
|
|
|
|
/* Return index of next available slot in tile cache */
|
|
int fgTileCacheNextAvail( void ) {
|
|
struct fgVIEW *v;
|
|
int i;
|
|
float dx, dy, dz, max, med, min, tmp;
|
|
float dist, max_dist;
|
|
int max_index;
|
|
|
|
v = ¤t_view;
|
|
|
|
max_dist = 0.0;
|
|
max_index = 0;
|
|
|
|
for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
|
|
if ( tile_cache[i].used == 0 ) {
|
|
return(i);
|
|
} else {
|
|
/* calculate approximate distance from view point */
|
|
fgPrintf( FG_TERRAIN, FG_DEBUG,
|
|
"DIST Abs view pos = %.4f, %.4f, %.4f\n",
|
|
v->abs_view_pos.x, v->abs_view_pos.y, v->abs_view_pos.z );
|
|
fgPrintf( FG_TERRAIN, FG_DEBUG,
|
|
" ref point = %.4f, %.4f, %.4f\n",
|
|
tile_cache[i].local_ref.x, tile_cache[i].local_ref.y,
|
|
tile_cache[i].local_ref.z);
|
|
|
|
dx = fabs(tile_cache[i].local_ref.x - v->abs_view_pos.x);
|
|
dy = fabs(tile_cache[i].local_ref.y - v->abs_view_pos.y);
|
|
dz = fabs(tile_cache[i].local_ref.z - v->abs_view_pos.z);
|
|
|
|
max = dx; med = dy; min = dz;
|
|
if ( max < med ) {
|
|
tmp = max; max = med; med = tmp;
|
|
}
|
|
if ( max < min ) {
|
|
tmp = max; max = min; min = tmp;
|
|
}
|
|
dist = max + (med + min) / 4;
|
|
|
|
fgPrintf( FG_TERRAIN, FG_DEBUG, " distance = %.2f\n", dist);
|
|
|
|
if ( dist > max_dist ) {
|
|
max_dist = dist;
|
|
max_index = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* If we made it this far, then there were no open cache entries.
|
|
* We will instead free the furthest cache entry and return it's
|
|
* index. */
|
|
|
|
fgTileCacheEntryFree( max_index );
|
|
return( max_index );
|
|
}
|
|
|
|
|
|
/* $Log$
|
|
/* Revision 1.7 1998/02/01 03:39:55 curt
|
|
/* Minor tweaks.
|
|
/*
|
|
* Revision 1.6 1998/01/31 00:43:26 curt
|
|
* Added MetroWorks patches from Carmen Volpe.
|
|
*
|
|
* Revision 1.5 1998/01/29 00:51:39 curt
|
|
* First pass at tile cache, dynamic tile loading and tile unloading now works.
|
|
*
|
|
* Revision 1.4 1998/01/27 03:26:43 curt
|
|
* Playing with new fgPrintf command.
|
|
*
|
|
* Revision 1.3 1998/01/27 00:48:03 curt
|
|
* Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
|
|
* system and commandline/config file processing code.
|
|
*
|
|
* Revision 1.2 1998/01/26 15:55:24 curt
|
|
* Progressing on building dynamic scenery system.
|
|
*
|
|
* Revision 1.1 1998/01/24 00:03:29 curt
|
|
* Initial revision.
|
|
*
|
|
*/
|
|
|
|
|