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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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* Quadtree data structures for holodeck display drivers.
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*/
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#include "tonemap.h"
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#include "rhdriver.h"
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#define DL 0 /* down left */
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#define DR 1 /* down right */
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#define UL 2 /* up left */
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#define UR 3 /* up right */
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#define BRF(i) (0x1<<(i)) /* branch flag bit */
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#define LFF(i) (0x10<<(i)) /* leaf flag bit */
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#define CHF(i) (0x100<<(i)) /* change flag bit */
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#define CHBRF(i) (0x101<<(i)) /* changed branch bit */
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#define CHLFF(i) (0x110<<(i)) /* changed leaf bit */
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#define BR_ANY 0xf /* flags for any branches */
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#define LF_ANY 0xf0 /* flags for any leaves */
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#define CH_ANY 0xf00 /* flags for any change */
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typedef struct rtree {
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short flgs; /* content flags (defined above) */
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union {
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struct rtree *b; /* if branch */
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int li; /* if leaf */
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} k[4]; /* children */
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} RTREE;
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extern struct rleaves {
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float (*wp)[3]; /* world intersection point array */
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int4 *wd; /* world direction array */
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TMbright *brt; /* encoded brightness array */
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BYTE (*chr)[3]; /* encoded chrominance array */
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BYTE (*rgb)[3]; /* tone-mapped color array */
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int nl; /* count of leaves in our pile */
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int bl, tl; /* bottom and top (next) leaf index */
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int tml; /* next leaf needing tone-mapping */
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char *base; /* base of allocated memory */
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} qtL; /* our pile of leaves */
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#define is_stump(t) (!((t)->flgs & (BR_ANY|LF_ANY)))
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extern RTREE qtrunk; /* trunk of quadtree */
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extern double qtDepthEps; /* epsilon to compare depths (z fraction) */
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extern int qtMinNodesiz; /* minimum node dimension (pixels) */
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extern int rayqleft; /* number of rays to queue before flush */
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extern int4 encodedir();
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extern double fdir2diff(), dir2diff();
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