1 // tilemgr.cxx -- routines to handle dynamic management of scenery tiles
3 // Written by Curtis Olson, started January 1998.
5 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 // (Log is kept at end of this file)
36 #include <Aircraft/aircraft.h>
38 #include <Scenery/obj.hxx>
39 #include <Scenery/scenery.hxx>
40 #include <Scenery/tilecache.hxx>
42 #include <Bucket/bucketutils.h>
43 #include <Debug/fg_debug.h>
44 #include <Include/fg_constants.h>
45 #include <Include/fg_types.h>
46 #include <Main/options.hxx>
47 #include <Main/views.hxx>
48 #include <Math/mat3.h>
51 #define FG_LOCAL_X_Y 81 // max(o->tile_diameter) ** 2
54 // closest (potentially viewable) tiles, centered on current tile.
55 // This is an array of pointers to cache indexes.
56 int tiles[FG_LOCAL_X_Y];
59 // Initialize the Tile Manager subsystem
60 int fgTileMgrInit( void ) {
61 fgPrintf( FG_TERRAIN, FG_INFO, "Initializing Tile Manager subsystem.\n");
67 void fgTileMgrLoadTile( struct fgBUCKET *p, int *index) {
70 c = &global_tile_cache;
72 fgPrintf( FG_TERRAIN, FG_DEBUG, "Updating for bucket %d %d %d %d\n",
73 p->lon, p->lat, p->x, p->y);
75 // if not in cache, load tile into the next available slot
76 if ( (*index = c->Exists(p)) < 0 ) {
77 *index = c->NextAvail();
78 c->EntryFillIn(*index, p);
81 fgPrintf( FG_TERRAIN, FG_DEBUG, "Selected cache index of %d\n", *index);
85 // given the current lon/lat, fill in the array of local chunks. If
86 // the chunk isn't already in the cache, then read it from disk.
87 int fgTileMgrUpdate( void ) {
91 struct fgBUCKET p1, p2;
92 static struct fgBUCKET p_last = {-1000, 0, 0, 0};
95 c = &global_tile_cache;
96 f = current_aircraft.flight;
99 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p1);
100 dw = o->tile_diameter / 2;
101 dh = o->tile_diameter / 2;
103 if ( (p1.lon == p_last.lon) && (p1.lat == p_last.lat) &&
104 (p1.x == p_last.x) && (p1.y == p_last.y) ) {
105 // same bucket as last time
106 fgPrintf( FG_TERRAIN, FG_DEBUG, "Same bucket as last time\n");
107 } else if ( p_last.lon == -1000 ) {
108 // First time through, initialize the system and load all
111 fgPrintf( FG_TERRAIN, FG_INFO, " First time through ... ");
112 fgPrintf( FG_TERRAIN, FG_INFO, " Updating Tile list for %d,%d %d,%d\n",
113 p1.lon, p1.lat, p1.x, p1.y);
114 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
115 o->tile_diameter * o->tile_diameter);
117 // wipe/initialize tile cache
120 // build the local area list and update cache
121 for ( j = 0; j < o->tile_diameter; j++ ) {
122 for ( i = 0; i < o->tile_diameter; i++ ) {
123 fgBucketOffset(&p1, &p2, i - dw, j - dh);
124 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) + i]);
128 // We've moved to a new bucket, we need to scroll our
129 // structures, and load in the new tiles
131 // CURRENTLY THIS ASSUMES WE CAN ONLY MOVE TO ADJACENT TILES.
132 // AT ULTRA HIGH SPEEDS THIS ASSUMPTION MAY NOT BE VALID IF
133 // THE AIRCRAFT CAN SKIP A TILE IN A SINGLE ITERATION.
135 fgPrintf( FG_TERRAIN, FG_INFO, "Updating Tile list for %d,%d %d,%d\n",
136 p1.lon, p1.lat, p1.x, p1.y);
138 if ( (p1.lon > p_last.lon) ||
139 ( (p1.lon == p_last.lon) && (p1.x > p_last.x) ) ) {
140 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
142 for ( j = 0; j < o->tile_diameter; j++ ) {
144 for ( i = 0; i < o->tile_diameter - 1; i++ ) {
145 tiles[(j*o->tile_diameter) + i] =
146 tiles[(j*o->tile_diameter) + i + 1];
148 // load in new column
149 fgBucketOffset(&p_last, &p2, dw + 1, j - dh);
150 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) +
151 o->tile_diameter - 1]);
153 } else if ( (p1.lon < p_last.lon) ||
154 ( (p1.lon == p_last.lon) && (p1.x < p_last.x) ) ) {
155 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
157 for ( j = 0; j < o->tile_diameter; j++ ) {
159 for ( i = o->tile_diameter - 1; i > 0; i-- ) {
160 tiles[(j*o->tile_diameter) + i] =
161 tiles[(j*o->tile_diameter) + i - 1];
163 // load in new column
164 fgBucketOffset(&p_last, &p2, -dw - 1, j - dh);
165 fgTileMgrLoadTile(&p2, &tiles[(j*o->tile_diameter) + 0]);
169 if ( (p1.lat > p_last.lat) ||
170 ( (p1.lat == p_last.lat) && (p1.y > p_last.y) ) ) {
171 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
173 for ( i = 0; i < o->tile_diameter; i++ ) {
175 for ( j = 0; j < o->tile_diameter - 1; j++ ) {
176 tiles[(j * o->tile_diameter) + i] =
177 tiles[((j+1) * o->tile_diameter) + i];
179 // load in new column
180 fgBucketOffset(&p_last, &p2, i - dw, dh + 1);
181 fgTileMgrLoadTile(&p2, &tiles[((o->tile_diameter-1) *
182 o->tile_diameter) + i]);
184 } else if ( (p1.lat < p_last.lat) ||
185 ( (p1.lat == p_last.lat) && (p1.y < p_last.y) ) ) {
186 fgPrintf( FG_TERRAIN, FG_INFO, " Loading %d tiles\n",
188 for ( i = 0; i < o->tile_diameter; i++ ) {
190 for ( j = o->tile_diameter - 1; j > 0; j-- ) {
191 tiles[(j * o->tile_diameter) + i] =
192 tiles[((j-1) * o->tile_diameter) + i];
194 // load in new column
195 fgBucketOffset(&p_last, &p2, i - dw, -dh - 1);
196 fgTileMgrLoadTile(&p2, &tiles[0 + i]);
208 // Calculate if point/radius is inside view frustum
209 static int viewable( fgCartesianPoint3d *cp, double radius ) {
212 int viewable = 1; // start by assuming it's viewable
213 double x0, x1, y1, slope;
217 MAT3_SET_HVEC(world, cp->x, cp->y, cp->z, 1.0);
218 MAT3mult_vec(eye, world, v->WORLD_TO_EYE);
219 // printf( "\nworld -> eye = %.2f %.2f %.2f radius = %.2f\n",
220 // eye[0], eye[1], eye[2], radius);
222 // Check near clip plane
223 if ( eye[2] - radius > 0.0 ) {
227 // check right clip plane (from eye perspective)
228 // y = m * (x - x0) = equation of a line intercepting X axis at x0
229 x1 = v->cos_fov_x * radius;
230 y1 = v->sin_fov_x * radius;
231 slope = -1.0 / v->slope_x;
232 x0 = x1 - y1 / slope;
234 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
235 // printf("eye[0] = %.2f eye[2] = %.2f\n", eye[0], eye[2]);
236 // printf("(r) x0 = %.2f slope_x = %.2f radius = %.2f\n",
237 // x0, slope, radius);
239 if ( eye[2] > slope * (eye[0] - x0) ) {
243 // check left clip plane (from eye perspective)
246 x0 = x1 - y1 / slope;
248 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
249 // printf("eye[0] = %.2f eye[2] = %.2f\n", eye[0], eye[2]);
250 // printf("(r) x0 = %.2f slope_x = %.2f radius = %.2f\n",
251 // x0, slope, radius);
253 if ( eye[2] > slope * (eye[0] - x0) ) {
257 // check bottom clip plane (from eye perspective)
258 x1 = -(v->cos_fov_y) * radius;
259 y1 = v->sin_fov_y * radius;
260 slope = 1.0 / v->slope_y;
261 x0 = x1 - y1 / slope;
263 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
264 // printf("eye[1] = %.2f eye[2] = %.2f\n", eye[1], eye[2]);
265 // printf("(r) x0 = %.2f slope_y = %.2f radius = %.2f\n",
266 // x0, slope, radius);
268 if ( eye[2] > slope * (eye[1] - x0) ) {
272 // check top clip plane (from eye perspective)
275 x0 = x1 - y1 / slope;
277 // printf("(r) x1 = %.2f y1 = %.2f\n", x1, y1);
278 // printf("eye[1] = %.2f eye[2] = %.2f\n", eye[1], eye[2]);
279 // printf("(r) x0 = %.2f slope_y = %.2f radius = %.2f\n",
280 // x0, slope, radius);
282 if ( eye[2] > slope * (eye[1] - x0) ) {
290 // Render the local tiles
291 void fgTileMgrRender( void ) {
298 fgCartesianPoint3d offset;
300 list < fgFRAGMENT > :: iterator current;
301 list < fgFRAGMENT > :: iterator last;
307 c = &global_tile_cache;
308 f = current_aircraft.flight;
309 o = ¤t_options;
312 // Find current translation offset
313 fgBucketFind(FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, &p);
314 index = c->Exists(&p);
315 t = c->GetTile(index);
317 fgPrintf( FG_TERRAIN, FG_DEBUG,
318 "Pos = (%.2f, %.2f) Current bucket = %d %d %d %d Index = %ld\n",
319 FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
320 p.lon, p.lat, p.x, p.y, fgBucketGenIndex(&p) );
322 for ( i = 0; i < (o->tile_diameter * o->tile_diameter); i++ ) {
324 // fgPrintf( FG_TERRAIN, FG_DEBUG, "Index = %d\n", index);
325 t = c->GetTile(index);
327 // calculate tile offset
328 offset.x = t->center.x - scenery.center.x;
329 offset.y = t->center.y - scenery.center.y;
330 offset.z = t->center.z - scenery.center.z;
332 // Course (tile based) culling
333 if ( viewable(&offset, t->bounding_radius) ) {
334 // at least a portion of this tile is viewable
337 xglTranslatef(offset.x, offset.y, offset.z);
339 // traverse fragment list for tile
340 current = t->fragment_list.begin();
341 last = t->fragment_list.end();
343 while ( current != last ) {
344 fragment = *current++;
346 if ( fragment.display_list >= 0 ) {
347 // Fine (fragment based) culling
348 offset.x = fragment.center.x - scenery.center.x;
349 offset.y = fragment.center.y - scenery.center.y;
350 offset.z = fragment.center.z - scenery.center.z;
352 if ( viewable(&offset, fragment.bounding_radius * 2) ) {
353 xglCallList(fragment.display_list);
356 // printf("Culled a fragment %.2f %.2f %.2f %.2f\n",
357 // fragment.center.x, fragment.center.y,
358 // fragment.center.z, fragment.bounding_radius);
366 culled += t->fragment_list.size();
370 if ( (drawn + culled) > 0 ) {
371 v->vfc_ratio = (double)culled / (double)(drawn + culled);
375 // printf("drawn = %d culled = %d saved = %.2f\n", drawn, culled,
381 // Revision 1.14 1998/06/01 17:56:20 curt
382 // Incremental additions to material.cxx (not fully functional)
383 // Tweaked vfc_ratio math to avoid divide by zero.
385 // Revision 1.13 1998/05/24 02:49:10 curt
386 // Implimented fragment level view frustum culling.
388 // Revision 1.12 1998/05/23 14:09:23 curt
389 // Added tile.cxx and tile.hxx.
390 // Working on rewriting the tile management system so a tile is just a list
391 // fragments, and the fragment record contains the display list for that fragment.
393 // Revision 1.11 1998/05/20 20:53:55 curt
394 // Moved global ref point and radius (bounding sphere info, and offset) to
395 // data file rather than calculating it on the fly.
396 // Fixed polygon winding problem in scenery generation stage rather than
397 // compensating for it on the fly.
398 // Made a fgTILECACHE class.
400 // Revision 1.10 1998/05/17 16:59:34 curt
401 // Frist pass at view frustum culling now operational.
403 // Revision 1.9 1998/05/16 13:09:58 curt
404 // Beginning to add support for view frustum culling.
405 // Added some temporary code to calculate bouding radius, until the
406 // scenery generation tools and scenery can be updated.
408 // Revision 1.8 1998/05/07 23:15:21 curt
409 // Fixed a glTexImage2D() usage bug where width and height were mis-swapped.
410 // Added support for --tile-radius=n option.
412 // Revision 1.7 1998/05/06 03:16:42 curt
413 // Added an option to control square tile radius.
415 // Revision 1.6 1998/05/02 01:52:18 curt
416 // Playing around with texture coordinates.
418 // Revision 1.5 1998/04/30 12:35:32 curt
419 // Added a command line rendering option specify smooth/flat shading.
421 // Revision 1.4 1998/04/27 03:30:14 curt
422 // Minor transformation adjustments to try to keep scenery tiles closer to
423 // (0, 0, 0) GLfloats run out of precision at the distances we need to model
424 // the earth, but we can do a bunch of pre-transformations using double math
425 // and then cast to GLfloat once everything is close in where we have less
426 // precision problems.
428 // Revision 1.3 1998/04/25 22:06:32 curt
429 // Edited cvs log messages in source files ... bad bad bad!
431 // Revision 1.2 1998/04/24 00:51:09 curt
432 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
433 // Tweaked the scenery file extentions to be "file.obj" (uncompressed)
434 // or "file.obz" (compressed.)
436 // Revision 1.1 1998/04/22 13:22:48 curt
437 // C++ - ifing the code a bit.
439 // Revision 1.25 1998/04/18 04:14:07 curt
440 // Moved fg_debug.c to it's own library.
442 // Revision 1.24 1998/04/14 02:23:18 curt
443 // Code reorganizations. Added a Lib/ directory for more general libraries.
445 // Revision 1.23 1998/04/08 23:30:08 curt
446 // Adopted Gnu automake/autoconf system.
448 // Revision 1.22 1998/04/03 22:11:38 curt
449 // Converting to Gnu autoconf system.
451 // Revision 1.21 1998/03/23 21:23:05 curt
452 // Debugging output tweaks.
454 // Revision 1.20 1998/03/14 00:30:51 curt
455 // Beginning initial terrain texturing experiments.
457 // Revision 1.19 1998/02/20 00:16:25 curt
458 // Thursday's tweaks.
460 // Revision 1.18 1998/02/19 13:05:54 curt
461 // Incorporated some HUD tweaks from Michelle America.
462 // Tweaked the sky's sunset/rise colors.
463 // Other misc. tweaks.
465 // Revision 1.17 1998/02/16 13:39:46 curt
466 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
467 // tiles to occasionally be missing.
469 // Revision 1.16 1998/02/12 21:59:53 curt
470 // Incorporated code changes contributed by Charlie Hotchkiss
471 // <chotchkiss@namg.us.anritsu.com>
473 // Revision 1.14 1998/02/09 21:30:19 curt
474 // Fixed a nagging problem with terrain tiles not "quite" matching up perfectly.
476 // Revision 1.13 1998/02/07 15:29:46 curt
477 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
478 // <chotchkiss@namg.us.anritsu.com>
480 // Revision 1.12 1998/02/01 03:39:55 curt
483 // Revision 1.11 1998/01/31 00:43:27 curt
484 // Added MetroWorks patches from Carmen Volpe.
486 // Revision 1.10 1998/01/29 00:51:40 curt
487 // First pass at tile cache, dynamic tile loading and tile unloading now works.
489 // Revision 1.9 1998/01/27 03:26:44 curt
490 // Playing with new fgPrintf command.
492 // Revision 1.8 1998/01/27 00:48:04 curt
493 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
494 // system and commandline/config file processing code.
496 // Revision 1.7 1998/01/26 15:55:25 curt
497 // Progressing on building dynamic scenery system.
499 // Revision 1.6 1998/01/24 00:03:30 curt
502 // Revision 1.5 1998/01/19 19:27:18 curt
503 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
504 // This should simplify things tremendously.
506 // Revision 1.4 1998/01/19 18:40:38 curt
507 // Tons of little changes to clean up the code and to remove fatal errors
508 // when building with the c++ compiler.
510 // Revision 1.3 1998/01/13 00:23:11 curt
511 // Initial changes to support loading and management of scenery tiles. Note,
512 // there's still a fair amount of work left to be done.
514 // Revision 1.2 1998/01/08 02:22:27 curt
515 // Continue working on basic features.
517 // Revision 1.1 1998/01/07 23:50:51 curt
518 // "area" renamed to "tile"
520 // Revision 1.2 1998/01/07 03:29:29 curt
521 // Given an arbitrary lat/lon, we can now:
522 // generate a unique index for the chunk containing the lat/lon
523 // generate a path name to the chunk file
524 // build a list of the indexes of all the nearby areas.
526 // Revision 1.1 1998/01/07 02:05:48 curt