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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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/* SCCSid "$SunId$ SGI" */ |
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/* RCSid: $Id$ */ |
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/* |
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* Sample data structures for holodeck display drivers. |
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* |
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* Include after "standard.h" |
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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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#include "object.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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#ifndef INVALID |
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#define INVALID -1 |
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#endif |
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#define SFLOAT float |
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typedef OBJECT S_ID; |
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#define S_ID_MAX ((1 << ((sizeof(S_ID)<<3)-1))-1) |
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typedef struct samp { |
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float (*wp)[3]; /* world intersection point array */ |
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int4 *wd; /* world direction array */ |
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#ifndef HP_VERSION |
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SFLOAT (*wp)[3]; /* world intersection point array */ |
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int32 *wd; /* world direction array */ |
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TMbright *brt; /* encoded brightness array */ |
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#endif |
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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 *info; /* Extra sample info */ |
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int *info1; /* Extra sample info */ |
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int max_samp; /* maximum number of samples */ |
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int max_base_pt; /* maximum number of aux points */ |
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int next_base_pt; /* next auxilliary point to add */ |
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int replace_samp; /* next sample to free */ |
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int max_base_pt; /* maximum number of aux points */ |
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S_ID next_base_pt; /* next auxilliary point to add */ |
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S_ID replace_samp; /* next sample to free */ |
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int num_samp; /* current number of samples */ |
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int tone_map; /* pointer to next value(s)t tonemap*/ |
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int free_samp; /* Available sample */ |
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S_ID tone_map; /* pointer to next value(s)t tonemap*/ |
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S_ID free_samp; /* next free sample */ |
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char *base; /* base of allocated memory */ |
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} SAMP; |
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#define S_BRT(s) ((s)->brt) |
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#define S_CHR(s) ((s)->chr) |
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#define S_RGB(s) ((s)->rgb) |
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#define S_INFO(s) ((s)->info) |
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#define S_INFO1(s) ((s)->info1) |
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#define S_MAX_SAMP(s) ((s)->max_samp) |
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#define S_MAX_BASE_PT(s) ((s)->max_base_pt) |
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#define S_NEXT_BASE_PT(s) ((s)->next_base_pt) |
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#define S_REPLACE_SAMP(s) ((s)->replace_samp) |
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#define S_NUM_SAMP(s) ((s)->num_samp) |
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#define S_TONE_MAP(s) ((s)->tone_map) |
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#define S_FREE_SAMP(s) ((s)->free_samp) |
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#define S_FREE_SAMP(s) ((s)->free_samp) |
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#define S_BASE(s) ((s)->base) |
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#define S_MAX_POINTS(s) ((s)->max_base_pt) |
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#define S_NTH_W_DIR(s,n) (S_W_DIR(s)[(n)]) |
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#define S_NTH_RGB(s,n) (S_RGB(s)[(n)]) |
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#define S_NTH_CHR(s,n) (S_CHR(s)[(n)]) |
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#ifndef HP_VERSION |
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#define S_NTH_INFO(s,n) (S_INFO(s)[(n)]) |
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#define S_NTH_INFO1(s,n) (S_INFO1(s)[(n)]) |
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#define S_NTH_BRT(s,n) (S_BRT(s)[(n)]) |
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#endif |
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/* Sample Flag macros */ |
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#define S_IS_FLAG(s) IS_FLAG(samp_flag,s) |
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#define S_SET_FLAG(s) SET_FLAG(samp_flag,s) |
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#define S_CLR_FLAG(s) CLR_FLAG(samp_flag,s) |
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#define S_NTH_NEXT(s,n) S_NTH_W_DIR(s,n) |
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#define sUnalloc_samp(s,n) (S_NTH_NEXT(s,n) = S_FREE_SAMP(s),S_FREE_SAMP(s)=n) |
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#define sUnalloc_samp(s,n) (S_NTH_NEXT(s,n)=S_FREE_SAMP(s),S_FREE_SAMP(s)=n) |
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#define sClear_base_points(s) (S_NEXT_BASE_PT(s) = S_MAX_SAMP(s)) |
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#define sClear(s) sInit(s) |
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/* Max allowed angle of sample dir from current view */ |
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#define MAXANG 20 |
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#define MAXDIFF2 ( MAXANG*MAXANG * (PI*PI/180./180.)) |
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/* MAXDIFF2 Max allowed cos angle squared of sample dir from current view */ |
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/* In terms of cos: if angle is 30: MAXDIFF2 = cos(30)^2, if difference |
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is greater than this point not accepted on rebuild |
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*/ |
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#define MAXDIFF2 0.75 |
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/* Max difference in direction for points at infinity: if over 45degrees |
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not accepted on rebuild cos(45) |
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*/ |
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#define MAXDIR 0.70710678 |
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#define MAXQUALITY 10000 /* Maximum quality for rendering rep */ |
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extern SAMP rsL; |
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extern double sDepthEps; /* epsilon to compare depths (z fraction) */ |
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extern int4 encodedir(); /* Encodes FVECT direction */ |
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extern int32 encodedir(); /* Encodes FVECT direction */ |
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extern void decodedir(); /* Decodes dir-> FVECT */ |
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extern double fdir2diff(), dir2diff(); /* Compare dir and FVECT */ |
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extern int4 *samp_flag; /* Per/sample flags s */ |
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extern int32 *samp_flag; /* Per/sample flags s */ |
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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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extern S_ID sAdd_base_point(); |
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extern SAMP *sAlloc(); |
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extern S_ID sAlloc_samp(); |
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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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* 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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*/ |
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