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gwlarson |
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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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* Sample data structures for holodeck display drivers.
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*/
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#include "color.h"
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#include "tonemap.h"
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#include "rhdriver.h"
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#ifndef int2
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#define int2 short
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#endif
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#ifndef int4
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#define int4 int
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#endif
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/* child ordering */
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typedef struct rsamp {
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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 max_samp; /* maximum number of samples */
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int max_aux_pt; /* maximum number of aux points */
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int next_aux_pt; /* next auxilliary point to add */
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int replace_samp; /* next sample to free */
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int num_samp; /* reached end of list? */
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int tone_map; /* pointer to next value(s) to tonemap*/
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int free_samp; /* list of freed samples */
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char *base; /* base of allocated memory */
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} RSAMP;
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#define RS_W_PT(s) ((s)->wp)
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#define RS_W_DIR(s) ((s)->wd)
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#define RS_BRT(s) ((s)->brt)
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#define RS_CHR(s) ((s)->chr)
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#define RS_RGB(s) ((s)->rgb)
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#define RS_MAX_SAMP(s) ((s)->max_samp)
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#define RS_TONE_MAP(s) ((s)->tone_map)
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#define RS_MAX_POINTS(s) ((s)->max_aux_pt)
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#define RS_REPLACE_SAMP(s) ((s)->replace_samp)
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#define RS_NEXT_AUX_PT(s) ((s)->next_aux_pt)
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#define RS_MAX_AUX_PT(s) ((s)->max_aux_pt)
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#define RS_BASE(s) ((s)->base)
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#define RS_NUM_SAMP(s) ((s)->num_samp)
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#define RS_FREE_SAMP(s) ((s)->free_samp)
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#define RS_NTH_W_PT(s,n) (RS_W_PT(s)[(n)])
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#define RS_NTH_W_DIR(s,n) (RS_W_DIR(s)[(n)])
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#define RS_NTH_RGB(s,n) (RS_RGB(s)[(n)])
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#define RS_NTH_CHR(s,n) (RS_CHR(s)[(n)])
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#define RS_NTH_BRT(s,n) (RS_BRT(s)[(n)])
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#define RS_EOL(s) (RS_NUM_SAMP(s) >= RS_MAX_SAMP(s))
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extern RSAMP rsL;
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extern double rsDepthEps; /* epsilon to compare depths (z fraction) */
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extern int4 encodedir();
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extern double fdir2diff(), dir2diff();
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extern void decodedir();
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/*
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* int
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* smInit(n) : Initialize/clear data structures for n entries
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* int n;
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*
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* Initialize sampL and other data structures for at least n samples.
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* If n is 0, then free data structures. Return number actually allocated.
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*
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*
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* int
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* smNewSamp(c, p, v) : register new sample point and return index
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* COLR c; : pixel color (RGBE)
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* FVECT p; : world intersection point
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* FVECT v; : ray direction vector
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*
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* Add new sample point to data structures, removing old values as necessary.
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* New sample representation will be output in next call to smUpdate().
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*
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*
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* int
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* smFindSamp(orig, dir): intersect ray with 3D rep. and find closest sample
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* FVECT orig, dir;
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*
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* Find the closest sample to the given ray. Return -1 on failure.
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*
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*
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* smClean() : display has been wiped clean
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*
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* Called after display has been effectively cleared, meaning that all
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* geometry must be resent down the pipeline in the next call to smUpdate().
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*
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*
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* smUpdate(vp, qua) : update OpenGL output geometry for view vp
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* VIEW *vp; : desired view
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* int qua; : quality level (percentage on linear time scale)
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*
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* Draw new geometric representation using OpenGL calls. Assume that the
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* view has already been set up and the correct frame buffer has been
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* selected for drawing. The quality level is on a linear scale, where 100%
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* is full (final) quality. It is not necessary to redraw geometry that has
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gwlarson |
3.2 |
* been output since the last call to smClean(). (The last view drawn will
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* be vp==&odev.v each time.)
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gwlarson |
3.1 |
*/
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/* These values are set by the driver, and used in the OGL call for glFrustum*/
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extern double dev_zmin,dev_zmax;
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