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gregl |
3.1 |
/* Copyright (c) 1997 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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/* quantity of leaves to free at a time */
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#ifndef LFREEPCT
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#define LFREEPCT 15
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#endif
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/* child ordering */
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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) (1<<(i)) /* branch flag bit */
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#define CHF(i) (0x10<<(i)) /* change flag bit */
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#define CHBRF(i) (0x11<<(i)) /* changed branch flags */
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#define CH_ANY 0xf0 /* flags for any change */
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typedef struct {
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float wp[3]; /* world intersection point */
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TMbright brt; /* encoded brightness (LogY) */
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BYTE chr[3]; /* encoded chrominance (RGB) */
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} RLEAF; /* recorded ray (leaf) value */
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typedef struct rtree {
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short flgs; /* branch flags */
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union {
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struct rtree *b; /* if branch */
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RLEAF *l; /* if leaf */
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} k[4]; /* children */
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} RTREE;
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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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gregl |
3.2 |
extern RLEAF *qtFindLeaf();
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gregl |
3.1 |
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/************************************************************************
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* These driver support routines implement the dev_value() call, but
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* require the following callbacks:
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dev_paintr(rgb, x0, y0, x1, y1) : paint a rectangle
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BYTE rgb[3]; : rectangle color
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int x0, y0, x1, y1; : rectangle boundaries
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Draws an open rectangle between [x0,x1) and [y0,y1) with the color rgb.
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This function is called many times by qtUpdate(), qtRedraw() and qtReplant().
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************************************************************************/
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