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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ SGI" */ |
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|
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/* |
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* sm_qtree.h - header file for routines using spherical quadtrees. |
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* |
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* adapted from octree.h |
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*/ |
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/* |
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* An quadtree is expressed as an integer which is either |
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* an index to 4 other nodes, the empty tree, or an index |
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* to a set of objects. If the quadtree has a value: |
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* |
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* > -1: it is an index to four other nodes. |
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* |
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* -1: it is empty |
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* |
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* < -1: it is an index to a set of objects |
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*/ |
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#include "object.h" |
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typedef struct _FUNC { |
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int (*func)(); |
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int (*func_after)(); |
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int *argptr; |
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}FUNC; |
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|
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#define F_FUNC(f) (f.func) |
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#define F_FUNC2(f) (f.func_after) |
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#define F_ARGS(f) (f.argptr) |
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#define QUADTREE int |
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|
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#define EMPTY (-1) |
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#define QT_IS_EMPTY(qt) ((qt) == EMPTY) |
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#define QT_IS_LEAF(qt) ((qt) < EMPTY) |
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#define QT_IS_TREE(qt) ((qt) > EMPTY) |
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#define QT_INDEX(qt) (-(qt)-2) /* quadtree node from set */ |
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#define QT_SET_INDEX(i) (-((i)+2)) /* object set from node */ |
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#define QT_BLOCK_SIZE 1024 /* quadtrees in block */ |
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#define QT_BLOCK(qt) ((qt)>>10) /* quadtree block index */ |
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#define QT_BLOCK_INDEX(qt) (((qt)&0x3ff)<<2) /* quadtree index in block */ |
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#ifndef QT_MAX_BLK |
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#ifdef BIGMEM |
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#define QT_MAX_BLK 16383 /* maximum quadtree block */ |
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#else |
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#define QT_MAX_BLK 2047 /* maximum quadtree block */ |
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#endif |
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#endif |
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#define QT_NTH_CHILD(qt,br) (quad_block[QT_BLOCK(qt)][QT_BLOCK_INDEX(qt)+br]) |
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#define QT_NTH_CHILD_PTR(qt,br) (&QT_NTH_CHILD(qt,br)) |
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#define QT_CLEAR_CHILDREN(qt) (QT_NTH_CHILD(qt,0)=QT_NTH_CHILD(qt,1)= \ |
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QT_NTH_CHILD(qt,2)=QT_NTH_CHILD(qt,3)=EMPTY) |
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/* QUADTREE NODE FLAGS */ |
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#define QT_IS_FLAG(qt) IS_FLAG(quad_flag,qt) |
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#define QT_SET_FLAG(qt) SET_FLAG(quad_flag,qt) |
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#define QT_CLR_FLAG(qt) CLR_FLAG(quad_flag,qt) |
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#define QT_LEAF_IS_FLAG(qt) IS_FLAG(qtsetflag,QT_INDEX(qt)) |
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#define QT_LEAF_SET_FLAG(qt) SET_FLAG(qtsetflag,QT_INDEX(qt)) |
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#define QT_LEAF_CLR_FLAG(qt) CLR_FLAG(qtsetflag,QT_INDEX(qt)) |
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/* OBJECT SET CODE */ |
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#define QT_SET_CNT(s) ((s)[0]) |
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#define QT_SET_NTH_ELEM(s,n) ((s)[(n)]) |
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#define QT_CLEAR_SET(s) ((s)[0] = 0) |
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#define QT_SET_NEXT_ELEM(p) (*(++p)) |
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#define QT_SET_PTR(s) (&((s)[1])) |
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#define QT_MAXSET 511 |
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#define MAXCSET 2*QT_MAXSET |
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#define QT_MAXCSET MAXCSET |
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#ifndef QT_SET_THRESHOLD |
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#define QT_SET_THRESHOLD 32 |
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#endif |
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#ifndef QT_MAX_LEVELS |
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#define QT_MAX_LEVELS 10 |
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#endif |
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#define QT_FILL_THRESHOLD 2 |
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#define QT_EXPAND 8 |
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#define QT_COMPRESS 16 |
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#define QT_DONE 32 |
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#define QT_MODIFIED 64 |
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#define QT_FLAG_FILL_TRI(f) (((f)&0x7) == QT_FILL_THRESHOLD) |
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#define QT_FLAG_UPDATE(f) ((f)& (QT_EXPAND | QT_COMPRESS)) |
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#define QT_FLAG_IS_DONE(f) ((f)& QT_DONE) |
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#define QT_FLAG_SET_DONE(f) ((f) |= QT_DONE) |
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#define QT_FLAG_IS_MODIFIED(f) ((f)& QT_MODIFIED) |
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#define QT_FLAG_SET_MODIFIED(f) ((f) |= QT_MODIFIED) |
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#define qtSubdivide(qt) (qt = qtAlloc(),QT_CLEAR_CHILDREN(qt)) |
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#define qtSubdivide_tri(v0,v1,v2,a,b,c) (EDGE_MIDPOINT(a,v1,v2), \ |
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EDGE_MIDPOINT(b,v2,v0), \ |
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EDGE_MIDPOINT(c,v0,v1)) |
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extern QUADTREE qtnewleaf(), qtaddelem(), qtdelelem(); |
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extern QUADTREE *quad_block[QT_MAX_BLK]; /* quadtree blocks */ |
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extern int4 *quad_flag; /* zeroeth quadtree flag */ |
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extern OBJECT **qtsettab; /* quadtree leaf node table */ |
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extern QUADTREE qtnumsets; /* number of used set indices */ |
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extern int4 *qtsetflag; |
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#ifdef DEBUG |
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extern OBJECT *qtqueryset(); |
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#else |
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#define qtqueryset(qt) (qtsettab[QT_SET_INDEX(qt)]) |
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#endif |
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#if 0 |
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#define qtremovelast(qt) ((*(qtqueryset(qt)))--) |
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#endif |
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#define qtinset(qt,id) inset(qtqueryset(qt),id) |
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#define qtgetset(os,qt) setcopy(os,qtqueryset(qt)) |
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#define SIDES_GTR(b0,b1,b2,s0,s1,s2,a,b,c) \ |
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(s0 = ((b0[0] > a?4:0) | (b1[0] > a?2:0) | (b2[0] > a?1:0)), \ |
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s1 = ((b0[1] > b?4:0) | (b1[1] > b?2:0) | (b2[1] > b?1:0)), \ |
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s2 = ((b0[2] > c?4:0) | (b1[2] > c?2:0) | (b2[2] > c?1:0))) |
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#define SIDES_LESS(b0,b1,b2,s0,s1,s2,a,b,c) \ |
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(s0 = ((b0[0] < a?4:0) | (b1[0] < a?2:0) | (b2[0] < a?1:0)), \ |
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s1 = ((b0[1] < b?4:0) | (b1[1] < b?2:0) | (b2[1] < b?1:0)), \ |
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s2 = ((b0[2] < c?4:0) | (b1[2] < c?2:0) | (b2[2] < c?1:0))) |
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/* |
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QUADTREE qtRoot_point_locate(qt,q0,q1,q2,peq,pt,r0,r1,r2) |
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QUADTREE qt; |
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FVECT q0,q1,q2; |
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FPEQ peq; |
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FVECT pt; |
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FVECT r0,r1,r2; |
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Return the quadtree node containing pt. It is assumed that pt is in |
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the root node qt with ws vertices q0,q1,q2 and plane equation peq. |
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If r0 != NULL will return coordinates of node in (r0,r1,r2). |
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*/ |
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extern QUADTREE qtRoot_point_locate(); |
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extern QUADTREE qtRoot_add_tri(); |
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extern QUADTREE qtRoot_remove_tri(); |
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extern QUADTREE qtAdd_tri(); |
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extern QUADTREE qtRoot_visit_tri_edges(); |
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extern QUADTREE qtRoot_trace_ray(); |
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