/**************************************************************************
- * tilecache.c -- routines to hancle scenery tile caching
+ * tilecache.c -- routines to handle scenery tile caching
*
* Written by Curtis Olson, started January 1998.
*
**************************************************************************/
-#ifdef WIN32
+#include <config.h>
+
+#ifdef HAVE_WINDOWS_H
# include <windows.h>
#endif
#include <GL/glut.h>
#include <XGL/xgl.h>
-#include <Scenery/bucketutils.h>
+#include <Include/general.h>
+
+#include <Bucket/bucketutils.h>
+#include <Debug/fg_debug.h>
+#include <Main/views.h>
#include <Scenery/obj.h>
#include <Scenery/tilecache.h>
-#include <Include/general.h>
/* tile cache */
struct fgTILE tile_cache[FG_TILE_CACHE_SIZE];
void fgTileCacheInit( void ) {
int i;
- printf("Initializing the tile cache.\n");
+ fgPrintf(FG_TERRAIN, FG_INFO, "Initializing the tile cache.\n");
for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
tile_cache[i].used = 0;
}
-/* Return index of next available slot in tile cache */
-int fgTileCacheNextAvail( void ) {
- int i;
-
- for ( i = 0; i < FG_TILE_CACHE_SIZE; i++ ) {
- if ( tile_cache[i].used == 0 ) {
- return(i);
- }
- }
-
- return(-1);
+/* 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;
+ fgGENERAL *g;
char base_path[256];
char file_name[256];
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);
+ 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 );
+ }
}
void fgTileCacheEntryInfo( int index, GLint *display_list,
struct fgCartesianPoint *local_ref ) {
*display_list = tile_cache[index].display_list;
- /* printf("Display list = %d\n", *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;
}
+/* 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 1.1 1998/01/24 00:03:29 curt
-/* Initial revision.
+/* Revision 1.11 1998/04/18 04:14:07 curt
+/* Moved fg_debug.c to it's own library.
/*
+ * Revision 1.10 1998/04/14 02:23:17 curt
+ * Code reorganizations. Added a Lib/ directory for more general libraries.
+ *
+ * Revision 1.9 1998/04/08 23:30:07 curt
+ * Adopted Gnu automake/autoconf system.
+ *
+ * Revision 1.8 1998/04/03 22:11:38 curt
+ * Converting to Gnu autoconf system.
+ *
+ * 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.
+ *
*/