240 lines
6.7 KiB
C++
240 lines
6.7 KiB
C++
/**************************************************************************
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* tilecache.c -- routines to handle scenery tile caching
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*
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* Written by Curtis Olson, started January 1998.
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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 <config.h>
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#include <GL/glut.h>
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#include <XGL/xgl.h>
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#include <Include/general.h>
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#include <Bucket/bucketutils.h>
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#include <Debug/fg_debug.h>
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#include <Main/views.hxx>
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#include "obj.h"
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#include "tilecache.hxx"
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/* tile cache */
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struct fgTILE tile_cache[FG_TILE_CACHE_SIZE];
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/* Initialize the tile cache subsystem */
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void fgTileCacheInit( void ) {
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int i;
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fgPrintf(FG_TERRAIN, FG_INFO, "Initializing the tile cache.\n");
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for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
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tile_cache[i].used = 0;
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}
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}
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/* Search for the specified "bucket" in the cache */
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int fgTileCacheExists( struct fgBUCKET *p ) {
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int i;
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for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
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if ( tile_cache[i].tile_bucket.lon == p->lon ) {
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if ( tile_cache[i].tile_bucket.lat == p->lat ) {
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if ( tile_cache[i].tile_bucket.x == p->x ) {
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if ( tile_cache[i].tile_bucket.y == p->y ) {
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fgPrintf( FG_TERRAIN, FG_DEBUG,
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"TILE EXISTS in cache ... index = %d\n", i );
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return( i );
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}
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}
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}
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}
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}
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return( -1 );
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}
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/* Fill in a tile cache entry with real data for the specified bucket */
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void fgTileCacheEntryFillIn( int index, struct fgBUCKET *p ) {
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fgGENERAL *g;
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char base_path[256];
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char file_name[256];
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g = &general;
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/* Mark this cache entry as used */
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tile_cache[index].used = 1;
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/* Update the bucket */
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tile_cache[index].tile_bucket.lon = p->lon;
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tile_cache[index].tile_bucket.lat = p->lat;
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tile_cache[index].tile_bucket.x = p->x;
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tile_cache[index].tile_bucket.y = p->y;
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/* Load the appropriate area and get the display list pointer */
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fgBucketGenBasePath(p, base_path);
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sprintf(file_name, "%s/Scenery/%s/%ld.obj", g->root_dir,
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base_path, fgBucketGenIndex(p));
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tile_cache[index].display_list =
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fgObjLoad(file_name, &tile_cache[index].local_ref,
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&tile_cache[index].bounding_radius);
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}
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/* Free a tile cache entry */
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void fgTileCacheEntryFree( int index ) {
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/* Mark this cache entry as un-used */
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tile_cache[index].used = 0;
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/* Update the bucket */
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fgPrintf( FG_TERRAIN, FG_DEBUG,
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"FREEING TILE = (%d %d %d %d)\n",
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tile_cache[index].tile_bucket.lon,
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tile_cache[index].tile_bucket.lat,
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tile_cache[index].tile_bucket.x,
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tile_cache[index].tile_bucket.y );
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/* Load the appropriate area and get the display list pointer */
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if ( tile_cache[index].display_list >= 0 ) {
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xglDeleteLists( tile_cache[index].display_list, 1 );
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}
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}
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/* Return info for a tile cache entry */
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void fgTileCacheEntryInfo( int index, GLint *display_list,
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struct fgCartesianPoint *local_ref ) {
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*display_list = tile_cache[index].display_list;
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/* fgPrintf(FG_TERRAIN, FG_DEBUG, "Display list = %d\n", *display_list); */
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local_ref->x = tile_cache[index].local_ref.x;
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local_ref->y = tile_cache[index].local_ref.y;
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local_ref->z = tile_cache[index].local_ref.z;
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}
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/* Return index of next available slot in tile cache */
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int fgTileCacheNextAvail( void ) {
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struct fgVIEW *v;
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int i;
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float dx, dy, dz, max, med, min, tmp;
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float dist, max_dist;
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int max_index;
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v = ¤t_view;
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max_dist = 0.0;
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max_index = 0;
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for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
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if ( tile_cache[i].used == 0 ) {
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return(i);
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} else {
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/* calculate approximate distance from view point */
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fgPrintf( FG_TERRAIN, FG_DEBUG,
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"DIST Abs view pos = %.4f, %.4f, %.4f\n",
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v->abs_view_pos.x, v->abs_view_pos.y, v->abs_view_pos.z );
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fgPrintf( FG_TERRAIN, FG_DEBUG,
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" ref point = %.4f, %.4f, %.4f\n",
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tile_cache[i].local_ref.x, tile_cache[i].local_ref.y,
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tile_cache[i].local_ref.z);
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dx = fabs(tile_cache[i].local_ref.x - v->abs_view_pos.x);
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dy = fabs(tile_cache[i].local_ref.y - v->abs_view_pos.y);
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dz = fabs(tile_cache[i].local_ref.z - v->abs_view_pos.z);
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max = dx; med = dy; min = dz;
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if ( max < med ) {
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tmp = max; max = med; med = tmp;
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}
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if ( max < min ) {
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tmp = max; max = min; min = tmp;
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}
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dist = max + (med + min) / 4;
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fgPrintf( FG_TERRAIN, FG_DEBUG, " distance = %.2f\n", dist);
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if ( dist > max_dist ) {
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max_dist = dist;
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max_index = i;
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}
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}
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}
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/* If we made it this far, then there were no open cache entries.
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* We will instead free the furthest cache entry and return it's
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* index. */
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fgTileCacheEntryFree( max_index );
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return( max_index );
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}
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/* $Log$
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/* Revision 1.1 1998/04/22 13:22:46 curt
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/* C++ - ifing the code a bit.
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/*
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* Revision 1.11 1998/04/18 04:14:07 curt
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* Moved fg_debug.c to it's own library.
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*
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* Revision 1.10 1998/04/14 02:23:17 curt
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* Code reorganizations. Added a Lib/ directory for more general libraries.
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*
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* Revision 1.9 1998/04/08 23:30:07 curt
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* Adopted Gnu automake/autoconf system.
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*
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* Revision 1.8 1998/04/03 22:11:38 curt
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* Converting to Gnu autoconf system.
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*
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* Revision 1.7 1998/02/01 03:39:55 curt
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* Minor tweaks.
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*
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* Revision 1.6 1998/01/31 00:43:26 curt
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* Added MetroWorks patches from Carmen Volpe.
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*
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* Revision 1.5 1998/01/29 00:51:39 curt
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* First pass at tile cache, dynamic tile loading and tile unloading now works.
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*
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* Revision 1.4 1998/01/27 03:26:43 curt
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* Playing with new fgPrintf command.
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*
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* Revision 1.3 1998/01/27 00:48:03 curt
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* Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
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* system and commandline/config file processing code.
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*
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* Revision 1.2 1998/01/26 15:55:24 curt
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* Progressing on building dynamic scenery system.
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*
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* Revision 1.1 1998/01/24 00:03:29 curt
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* Initial revision.
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*
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*/
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