111 lines
2.6 KiB
C++
111 lines
2.6 KiB
C++
#ifndef _HITLIST_HXX
|
|
#define _HITLIST_HXX
|
|
|
|
#ifndef __cplusplus
|
|
# error This library requires C++
|
|
#endif
|
|
|
|
#include <simgear/compiler.h>
|
|
|
|
#include <vector>
|
|
|
|
#include <plib/ssg.h>
|
|
|
|
SG_USING_STD(vector);
|
|
|
|
|
|
class FGHitRec {
|
|
|
|
private:
|
|
ssgEntity *ent;
|
|
int index;
|
|
sgdVec3 point;
|
|
sgdVec3 normal;
|
|
|
|
public:
|
|
|
|
FGHitRec( ssgEntity *e, int idx, sgdVec3 p, sgdVec3 n ) {
|
|
ent = e;
|
|
index = idx;
|
|
sgdSetVec3(point,p[0],p[1],p[2]);
|
|
sgdSetVec3(normal,n[0],n[1],n[2]);
|
|
}
|
|
|
|
ssgEntity *get_entity(void) { return ent; }
|
|
int get_face(void) { return index; }
|
|
double *get_point(void) { return point; }
|
|
double *get_normal(void) { return normal; }
|
|
};
|
|
|
|
|
|
class FGHitList {
|
|
|
|
private:
|
|
|
|
ssgEntity *last;
|
|
vector < FGHitRec > list;
|
|
|
|
public:
|
|
|
|
FGHitList() { last = NULL; }
|
|
void init(void) { list.clear(); }
|
|
void clear(void) { init(); last = NULL; }
|
|
void add( ssgEntity *ent, int idx, sgdVec3 point, sgdVec3 normal ) {
|
|
list.push_back( FGHitRec( ent,idx,point,normal) );
|
|
last = ent;
|
|
}
|
|
int num_hits(void) { return list.size(); }
|
|
ssgEntity *get_entity(int i) { return list[i].get_entity(); }
|
|
ssgEntity *last_hit(void) { return last; }
|
|
int get_face(int i) { return list[i].get_face(); }
|
|
double *get_point(int i) { return list[i].get_point(); }
|
|
double *get_normal(int i) { return list[i].get_normal(); }
|
|
|
|
void Intersect( ssgBranch *branch,
|
|
sgdVec3 orig, sgdVec3 dir );
|
|
|
|
void IntersectBranch( ssgBranch *branch, sgdMat4 m,
|
|
sgdVec3 orig, sgdVec3 dir);
|
|
|
|
void IntersectCachedLeaf( sgdMat4 m,
|
|
sgdVec3 orig, sgdVec3 dir);
|
|
|
|
int IntersectLeaf( ssgLeaf *leaf, sgdMat4 m,
|
|
sgdVec3 orig, sgdVec3 dir );
|
|
};
|
|
|
|
|
|
inline void FGHitList::Intersect( ssgBranch *scene,
|
|
sgdVec3 orig, sgdVec3 dir )
|
|
{
|
|
sgdMat4 m;
|
|
|
|
#ifdef USE_CACHED_HIT
|
|
// This optimization gives a slight speedup
|
|
// but it precludes using the hitlist for dynamic
|
|
// objects NHV
|
|
init();
|
|
if( last_hit() ) {
|
|
sgdMakeIdentMat4 ( m ) ;
|
|
IntersectCachedLeaf(m, orig, dir);
|
|
}
|
|
if( ! num_hits() ) {
|
|
#endif
|
|
clear();
|
|
sgdMakeIdentMat4 ( m ) ;
|
|
IntersectBranch( scene, m, orig, dir);
|
|
#ifdef USE_CACHED_HIT
|
|
}
|
|
#endif
|
|
}
|
|
|
|
|
|
// Associated function, assuming a wgs84 world with 0,0,0 at the
|
|
// center, find the current terrain intersection elevation for the
|
|
// point specified.
|
|
bool fgCurrentElev( sgdVec3 abs_view_pos, sgdVec3 scenery_center,
|
|
FGHitList *hit_list,
|
|
double *terrain_elev, double *radius, double *normal );
|
|
|
|
|
|
#endif // _HITLIST_HXX
|