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flightgear/Scenery/tilemgr.c
curt 2805fb7cb2 Thursday's tweaks.
1998-02-20 00:16:14 +00:00

301 lines
9.4 KiB
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/**************************************************************************
* tilemgr.c -- routines to handle dynamic management of scenery tiles
*
* 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 <Scenery/scenery.h>
#include <Scenery/bucketutils.h>
#include <Scenery/obj.h>
#include <Scenery/tilecache.h>
#include <Aircraft/aircraft.h>
#include <Include/fg_constants.h>
#include <Include/fg_types.h>
#include <Main/fg_debug.h>
#define FG_LOCAL_X 7 /* should be odd */
#define FG_LOCAL_Y 7 /* should be odd */
#define FG_LOCAL_X_Y 49 /* At least FG_LOCAL_X times FG_LOCAL_Y */
/* closest (potentially viewable) tiles, centered on current tile.
* This is an array of pointers to cache indexes. */
int tiles[FG_LOCAL_X_Y];
/* Initialize the Tile Manager subsystem */
int fgTileMgrInit( void ) {
fgPrintf( FG_TERRAIN, FG_INFO, "Initializing Tile Manager subsystem.\n");
return 1;
}
/* load a tile */
void fgTileMgrLoadTile( struct fgBUCKET *p, int *index) {
fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating for bucket %d %d %d %d\n",
p->lon, p->lat, p->x, p->y);
/* if not in cache, load tile into the next available slot */
if ( (*index = fgTileCacheExists(p)) < 0 ) {
*index = fgTileCacheNextAvail();
fgTileCacheEntryFillIn(*index, p);
}
fgPrintf( FG_TERRAIN, FG_DEBUG, "Selected cache index of %d\n", *index);
}
/* given the current lon/lat, fill in the array of local chunks. If
* the chunk isn't already in the cache, then read it from disk. */
int fgTileMgrUpdate( void ) {
fgFLIGHT *f;
struct fgBUCKET p1, p2;
static struct fgBUCKET p_last = {-1000, 0, 0, 0};
int i, j, dw, dh;
f = current_aircraft.flight;
fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
dw = FG_LOCAL_X / 2;
dh = FG_LOCAL_Y / 2;
if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
(p1.x == p_last.x) && (p1.y == p_last.y) ) {
/* same bucket as last time */
fgPrintf( FG_TERRAIN, FG_DEBUG, "Same bucket as last time\n");
} else if ( p_last.lon == -1000 ) {
/* First time through, initialize the system and load all
* relavant tiles */
fgPrintf( FG_TERRAIN, FG_DEBUG, "First time through ... \n");
fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating Tile list for %d,%d %d,%d\n",
p1.lon, p1.lat, p1.x, p1.y);
/* wipe tile cache */
fgTileCacheInit();
/* build the local area list and update cache */
for ( j = 0; j < FG_LOCAL_Y; j++ ) {
for ( i = 0; i < FG_LOCAL_X; i++ ) {
fgBucketOffset(&p1, &p2, i - dw, j - dh);
fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + i]);
}
}
} else {
/* We've moved to a new bucket, we need to scroll our
* structures, and load in the new tiles */
/* CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION. */
if ( (p1.lon > p_last.lon) ||
( (p1.lon == p_last.lon) && (p1.x > p_last.x) ) ) {
for ( j = 0; j < FG_LOCAL_Y; j++ ) {
/* scrolling East */
for ( i = 0; i < FG_LOCAL_X - 1; i++ ) {
tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i + 1];
}
/* load in new column */
fgBucketOffset(&p_last, &p2, dw + 1, j - dh);
fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + FG_LOCAL_X - 1]);
}
} else if ( (p1.lon < p_last.lon) ||
( (p1.lon == p_last.lon) && (p1.x < p_last.x) ) ) {
for ( j = 0; j < FG_LOCAL_Y; j++ ) {
/* scrolling West */
for ( i = FG_LOCAL_X - 1; i > 0; i-- ) {
tiles[(j*FG_LOCAL_Y) + i] = tiles[(j*FG_LOCAL_Y) + i - 1];
}
/* load in new column */
fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
fgTileMgrLoadTile(&p2, &tiles[(j*FG_LOCAL_Y) + 0]);
}
}
if ( (p1.lat > p_last.lat) ||
( (p1.lat == p_last.lat) && (p1.y > p_last.y) ) ) {
for ( i = 0; i < FG_LOCAL_X; i++ ) {
/* scrolling North */
for ( j = 0; j < FG_LOCAL_Y - 1; j++ ) {
tiles[(j * FG_LOCAL_Y) + i] =
tiles[((j+1) * FG_LOCAL_Y) + i];
}
/* load in new column */
fgBucketOffset(&p_last, &p2, i - dw, dh + 1);
fgTileMgrLoadTile(&p2, &tiles[((FG_LOCAL_Y-1)*FG_LOCAL_Y) + i]);
}
} else if ( (p1.lat < p_last.lat) ||
( (p1.lat == p_last.lat) && (p1.y < p_last.y) ) ) {
for ( i = 0; i < FG_LOCAL_X; i++ ) {
/* scrolling South */
for ( j = FG_LOCAL_Y - 1; j > 0; j-- ) {
tiles[(j * FG_LOCAL_Y) + i] =
tiles[((j-1) * FG_LOCAL_Y) + i];
}
/* load in new column */
fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
fgTileMgrLoadTile(&p2, &tiles[0 + i]);
}
}
}
p_last.lon = p1.lon;
p_last.lat = p1.lat;
p_last.x = p1.x;
p_last.y = p1.y;
return 1;
}
/* Render the local tiles */
void fgTileMgrRender( void ) {
fgFLIGHT *f;
struct fgBUCKET p;
static GLfloat terrain_color[4] = { 0.6, 0.8, 0.4, 1.0 };
static GLfloat terrain_ambient[4];
static GLfloat terrain_diffuse[4];
struct fgCartesianPoint local_ref;
GLint display_list;
int i;
int index;
f = current_aircraft.flight;
for ( i = 0; i < 4; i++ ) {
terrain_ambient[i] = terrain_color[i] * 0.5;
terrain_diffuse[i] = terrain_color[i];
}
xglMaterialfv(GL_FRONT, GL_AMBIENT, terrain_ambient);
xglMaterialfv(GL_FRONT, GL_DIFFUSE, terrain_diffuse);
/* Find current translation offset */
fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
index = fgTileCacheExists(&p);
fgTileCacheEntryInfo(index, &display_list, &scenery.next_center );
printf("Current bucket = %d %d %d %d\n", p.lon, p.lat, p.x, p.y );
for ( i = 0; i < FG_LOCAL_X_Y; i++ ) {
index = tiles[i];
/* fgPrintf( FG_TERRAIN, FG_DEBUG, "Index = %d\n", index); */
fgTileCacheEntryInfo(index, &display_list, &local_ref );
if ( display_list >= 0 ) {
xglPushMatrix();
/* xglTranslatef(local_ref.x - scenery.center.x,
local_ref.y - scenery.center.y,
local_ref.z - scenery.center.z); */
xglTranslatef(-scenery.center.x, -scenery.center.y,
-scenery.center.z);
xglCallList(display_list);
xglPopMatrix();
}
}
}
/* $Log$
/* Revision 1.19 1998/02/20 00:16:25 curt
/* Thursday's tweaks.
/*
* Revision 1.18 1998/02/19 13:05:54 curt
* Incorporated some HUD tweaks from Michelle America.
* Tweaked the sky's sunset/rise colors.
* Other misc. tweaks.
*
* Revision 1.17 1998/02/16 13:39:46 curt
* Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
* tiles to occasionally be missing.
*
* Revision 1.16 1998/02/12 21:59:53 curt
* Incorporated code changes contributed by Charlie Hotchkiss
* <chotchkiss@namg.us.anritsu.com>
*
* Revision 1.14 1998/02/09 21:30:19 curt
* Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
*
* Revision 1.13 1998/02/07 15:29:46 curt
* Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
* <chotchkiss@namg.us.anritsu.com>
*
* Revision 1.12 1998/02/01 03:39:55 curt
* Minor tweaks.
*
* Revision 1.11 1998/01/31 00:43:27 curt
* Added MetroWorks patches from Carmen Volpe.
*
* Revision 1.10 1998/01/29 00:51:40 curt
* First pass at tile cache, dynamic tile loading and tile unloading now works.
*
* Revision 1.9 1998/01/27 03:26:44 curt
* Playing with new fgPrintf command.
*
* Revision 1.8 1998/01/27 00:48:04 curt
* Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
* system and commandline/config file processing code.
*
* Revision 1.7 1998/01/26 15:55:25 curt
* Progressing on building dynamic scenery system.
*
* Revision 1.6 1998/01/24 00:03:30 curt
* Initial revision.
*
* Revision 1.5 1998/01/19 19:27:18 curt
* Merged in make system changes from Bob Kuehne <rpk@sgi.com>
* This should simplify things tremendously.
*
* Revision 1.4 1998/01/19 18:40:38 curt
* Tons of little changes to clean up the code and to remove fatal errors
* when building with the c++ compiler.
*
* Revision 1.3 1998/01/13 00:23:11 curt
* Initial changes to support loading and management of scenery tiles. Note,
* there's still a fair amount of work left to be done.
*
* Revision 1.2 1998/01/08 02:22:27 curt
* Continue working on basic features.
*
* Revision 1.1 1998/01/07 23:50:51 curt
* "area" renamed to "tile"
*
* Revision 1.2 1998/01/07 03:29:29 curt
* Given an arbitrary lat/lon, we can now:
* generate a unique index for the chunk containing the lat/lon
* generate a path name to the chunk file
* build a list of the indexes of all the nearby areas.
*
* Revision 1.1 1998/01/07 02:05:48 curt
* Initial revision.
* */
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