184 lines
4.3 KiB
C++
184 lines
4.3 KiB
C++
// tilemgr.hxx -- 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.
|
|
//
|
|
// $Id$
|
|
|
|
|
|
#ifndef _TILEMGR_HXX
|
|
#define _TILEMGR_HXX
|
|
|
|
|
|
#ifndef __cplusplus
|
|
# error This library requires C++
|
|
#endif
|
|
|
|
#include <simgear/compiler.h>
|
|
|
|
#include <list>
|
|
|
|
#include <plib/ssg.h>
|
|
|
|
#include <simgear/bucket/newbucket.hxx>
|
|
|
|
#include "hitlist.hxx"
|
|
|
|
FG_USING_STD(list);
|
|
|
|
|
|
#define FG_LOCAL_X_Y 81 // max(o->tile_diameter) ** 2
|
|
|
|
#define FG_SQUARE( X ) ( (X) * (X) )
|
|
|
|
#if defined(USE_MEM) || defined(WIN32)
|
|
# define FG_MEM_COPY(to,from,n) memcpy(to, from, n)
|
|
#else
|
|
# define FG_MEM_COPY(to,from,n) bcopy(from, to, n)
|
|
#endif
|
|
|
|
|
|
// forward declaration
|
|
class FGTileEntry;
|
|
|
|
|
|
class FGLoadRec {
|
|
|
|
public:
|
|
|
|
FGBucket b;
|
|
int cache_index;
|
|
};
|
|
|
|
|
|
class FGTileMgr {
|
|
|
|
private:
|
|
|
|
// Tile loading state
|
|
enum load_state {
|
|
Start = 0,
|
|
Inited = 1,
|
|
Running = 2
|
|
};
|
|
|
|
load_state state;
|
|
|
|
enum SCROLL_DIRECTION {
|
|
SCROLL_INIT = -1,
|
|
SCROLL_NONE = 0,
|
|
SCROLL_NORTH,
|
|
SCROLL_EAST,
|
|
SCROLL_SOUTH,
|
|
SCROLL_WEST,
|
|
};
|
|
|
|
SCROLL_DIRECTION scroll_direction;
|
|
|
|
// pending tile load queue
|
|
list < FGLoadRec > load_queue;
|
|
|
|
// initialize the cache
|
|
void initialize_queue();
|
|
|
|
// forced emptying of the queue. This is necessay to keep
|
|
// bookeeping straight for the tile_cache -- which actually
|
|
// handles all the (de)allocations
|
|
void destroy_queue();
|
|
|
|
FGBucket BucketOffset( int dx, int dy );
|
|
|
|
// schedule a tile for loading
|
|
int sched_tile( const FGBucket& b );
|
|
|
|
// load a tile
|
|
void load_tile( const FGBucket& b, int cache_index );
|
|
|
|
// schedule a tile row(column) for loading
|
|
void scroll( void );
|
|
|
|
// see comment at prep_ssg_nodes()
|
|
void prep_ssg_node( int idx );
|
|
|
|
// int hitcount;
|
|
// sgdVec3 hit_pts [ MAX_HITS ] ;
|
|
|
|
// ssgEntity *last_hit;
|
|
FGHitList hit_list;
|
|
|
|
FGBucket previous_bucket;
|
|
FGBucket current_bucket;
|
|
FGBucket pending;
|
|
|
|
FGTileEntry *current_tile;
|
|
|
|
// index of current tile in tile cache;
|
|
long int tile_index;
|
|
int tile_diameter;
|
|
|
|
// current longitude latitude
|
|
double longitude;
|
|
double latitude;
|
|
double last_longitude;
|
|
double last_latitude;
|
|
|
|
public:
|
|
|
|
// Constructor
|
|
FGTileMgr ( void );
|
|
|
|
// Destructor
|
|
~FGTileMgr ( void );
|
|
|
|
// Initialize the Tile Manager subsystem
|
|
int init( void );
|
|
|
|
// given the current lon/lat (in degrees), fill in the array of
|
|
// local chunks. If the chunk isn't already in the cache, then
|
|
// read it from disk.
|
|
int update( double lon, double lat );
|
|
|
|
// Determine scenery altitude. Normally this just happens when we
|
|
// render the scene, but we'd also like to be able to do this
|
|
// explicitely. lat & lon are in radians. abs_view_pos in
|
|
// meters. Returns result in meters.
|
|
void my_ssg_los( string s, ssgBranch *branch, sgdMat4 m,
|
|
const sgdVec3 p, const sgdVec3 dir, sgdVec3 normal );
|
|
|
|
void my_ssg_los( ssgBranch *branch, sgdMat4 m,
|
|
const sgdVec3 p, const sgdVec3 dir,
|
|
FGHitList *list );
|
|
|
|
bool current_elev_ssg( sgdVec3 abs_view_pos,
|
|
sgVec3 view_pos,
|
|
double *terrain_elev );
|
|
|
|
// Prepare the ssg nodes ... for each tile, set it's proper
|
|
// transform and update it's range selector based on current
|
|
// visibilty
|
|
void prep_ssg_nodes( void );
|
|
|
|
inline int queue_size() const { return load_queue.size(); }
|
|
};
|
|
|
|
|
|
// the tile manager
|
|
extern FGTileMgr global_tile_mgr;
|
|
|
|
|
|
#endif // _TILEMGR_HXX
|