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/* Copyright (c) 1999 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Rendering routines for rhpict. |
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*/ |
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#include <string.h> |
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#include "holo.h" |
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#include "view.h" |
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#include "random.h" |
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#ifndef DEPS |
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#define DEPS 0.02 /* depth epsilon */ |
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#define MAXRAD 64 /* maximum kernel radius */ |
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#endif |
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#ifndef NNEIGH |
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#define NNEIGH 7 /* find this many neighbors */ |
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#define NNEIGH 5 /* find this many neighbors */ |
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#endif |
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#define NINF 16382 |
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#define CLR4(f,i) FL4OP(f,i,&=~) |
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#define TGL4(f,i) FL4OP(f,i,^=) |
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#define FL4NELS(n) (((n)+0x1f)>>5) |
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#define CLR4ALL(f,n) bzero((char *)(f),FL4NELS(n)*sizeof(int4)) |
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#define CLR4ALL(f,n) memset((char *)(f),'\0',FL4NELS(n)*sizeof(int32)) |
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#endif |
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static int4 *pixFlags; /* pixel occupancy flags */ |
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static int32 *pixFlags; /* pixel occupancy flags */ |
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static float pixWeight[MAXRAD2]; /* pixel weighting function */ |
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static short isqrttab[MAXRAD2]; /* integer square root table */ |
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#define isqrt(i2) ((int)isqrttab[(int)(i2)]) |
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#define isqrt(i2) (isqrttab[i2]) |
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extern VIEW myview; /* current output view */ |
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extern COLOR *mypixel; /* pixels being rendered */ |
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extern float *mydepth; /* depth values (visibility culling) */ |
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extern int hres, vres; /* current horizontal and vertical res. */ |
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extern void pixFinish(double ransamp); |
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extern void pixBeam(BEAM *bp, HDBEAMI *hb); |
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pixBeam(bp, hb) /* render a particular beam */ |
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BEAM *bp; |
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register HDBEAMI *hb; |
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typedef int (sampfunc)(int h, int v, short nl[NNEIGH][2], int nd[NNEIGH], |
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int n, double *rf); |
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static sampfunc kill_occl; |
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static sampfunc smooth_samp; |
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static sampfunc random_samp; |
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static void meet_neighbors(int occ, sampfunc *nf, double *dp); |
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static void reset_flags(void); |
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static void init_wfunc(void); |
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static int findneigh(short nl[NNEIGH][2], int nd[NNEIGH], int h, int v, |
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register short (*rnl)[NNEIGH]); |
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extern void |
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pixBeam( /* render a particular beam */ |
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BEAM *bp, |
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register HDBEAMI *hb |
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) |
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{ |
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GCOORD gc[2]; |
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register RAYVAL *rv; |
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double d, prox; |
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COLOR col; |
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int n; |
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register int4 p; |
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register int32 p; |
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if (!hdbcoord(gc, hb->h, hb->b)) |
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error(CONSISTENCY, "bad beam in render_beam"); |
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} |
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int |
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kill_occl(h, v, nl, n) /* check for occlusion errors */ |
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int h, v; |
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register short nl[NNEIGH][2]; |
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int n; |
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static int |
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kill_occl( /* check for occlusion errors */ |
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int h, |
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int v, |
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register short nl[NNEIGH][2], |
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int nd[NNEIGH], |
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int n, |
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double *rf |
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) |
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{ |
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short forequad[2][2]; |
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int d; |
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register int4 i, p; |
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register int i; |
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register int32 p; |
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if (n <= 0) |
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if (n <= 0) { |
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#ifdef DEBUG |
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error(WARNING, "neighborless sample in kill_occl"); |
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#endif |
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return(1); |
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} |
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p = v*hres + h; |
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forequad[0][0] = forequad[0][1] = forequad[1][0] = forequad[1][1] = 0; |
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for (i = n; i--; ) { |
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d = (h-nl[i][0])*(h-nl[i][0]) + (v-nl[i][1])*(v-nl[i][1]); |
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d = isqrt(d); |
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d = isqrt(nd[i]); |
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if (mydepth[nl[i][1]*hres+nl[i][0]]*(1.+DEPS*d) < mydepth[p]) |
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forequad[nl[i][0]<h][nl[i][1]<v] = 1; |
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} |
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} |
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int |
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grow_samp(h, v, nl, n) /* grow sample point appropriately */ |
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int h, v; |
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register short nl[NNEIGH][2]; |
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int n; |
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static int |
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smooth_samp( /* grow sample point smoothly */ |
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int h, |
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int v, |
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register short nl[NNEIGH][2], |
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int nd[NNEIGH], |
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int n, |
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double *rf |
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) |
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{ |
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int dis[NNEIGH], ndis; |
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COLOR mykern[MAXRAD2]; |
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int4 maxr2; |
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double w, d; |
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register int4 p, r2; |
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int maxr2; |
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double d; |
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register int32 p; |
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register int r2; |
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int i, r, maxr, h2, v2; |
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if (n <= 0) |
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return(1); |
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p = v*hres + h; /* build kernel values */ |
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maxr2 = (h-nl[n-1][0])*(h-nl[n-1][0]) + (v-nl[n-1][1])*(v-nl[n-1][1]); |
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maxr2 = nd[n-1]; |
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DCHECK(maxr2>=MAXRAD2, CONSISTENCY, "out of range neighbor"); |
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maxr = isqrt(maxr2); |
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for (v2 = 1; v2 <= maxr; v2++) |
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} |
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ndis = 0; /* find discontinuities */ |
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for (i = n; i--; ) { |
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r2 = (h-nl[i][0])*(h-nl[i][0]) + (v-nl[i][1])*(v-nl[i][1]); |
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r = isqrt(r2); |
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r = isqrt(nd[i]); |
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d = mydepth[nl[i][1]*hres+nl[i][0]] / mydepth[p]; |
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d = d>=1. ? d-1. : 1.-d; |
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if (d > r*DEPS || bigdiff(mypixel[p], |
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} |
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if (i >= 0) continue; /* outside edge */ |
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addcolor(mypixel[v2*hres+h2], mykern[r2]); |
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myweight[v2*hres+h2] += pixWeight[r2] * |
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myweight[v*hres+h]; |
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myweight[v2*hres+h2] += pixWeight[r2] * myweight[p]; |
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} |
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} |
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return(1); |
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} |
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pixFlush() /* done with beams -- flush pixel values */ |
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static int |
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random_samp( /* gather samples randomly */ |
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int h, |
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int v, |
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register short nl[NNEIGH][2], |
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int nd[NNEIGH], |
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int n, |
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double *rf |
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) |
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{ |
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reset_flags(); /* set occupancy flags */ |
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meet_neighbors(kill_occl); /* eliminate occlusion errors */ |
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reset_flags(); /* reset occupancy flags */ |
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float rnt[NNEIGH]; |
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double rvar; |
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register int32 p, pn; |
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register int ni; |
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if (n <= 0) |
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return(1); |
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p = v*hres + h; |
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if (*rf <= FTINY) /* straight Voronoi regions */ |
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ni = 0; |
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else { /* weighted choice */ |
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DCHECK(nd[n-1]>=MAXRAD2, CONSISTENCY, "out of range neighbor"); |
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rnt[0] = pixWeight[nd[0]]; |
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for (ni = 1; ni < n; ni++) |
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rnt[ni] = rnt[ni-1] + pixWeight[nd[ni]]; |
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rvar = rnt[n-1]*pow(frandom(), 1. / *rf); |
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for (ni = 0; rvar > rnt[ni]+FTINY; ni++) |
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; |
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} |
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pn = nl[ni][1]*hres + nl[ni][0]; |
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addcolor(mypixel[p], mypixel[pn]); |
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myweight[p] += myweight[pn]; |
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return(1); |
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} |
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extern void |
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pixFinish( /* done with beams -- compute pixel values */ |
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double ransamp |
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) |
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{ |
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if (pixWeight[0] <= FTINY) |
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init_wfunc(); /* initialize weighting function */ |
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meet_neighbors(grow_samp); /* grow valid samples over image */ |
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free((char *)pixFlags); /* free pixel flags */ |
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reset_flags(); /* set occupancy flags */ |
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meet_neighbors(1,kill_occl,NULL); /* identify occlusion errors */ |
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reset_flags(); /* reset occupancy flags */ |
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if (ransamp >= 0.) /* spread samples over image */ |
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meet_neighbors(0,random_samp,&ransamp); |
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else |
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meet_neighbors(1,smooth_samp,NULL); |
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free((void *)pixFlags); /* free pixel flags */ |
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pixFlags = NULL; |
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} |
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reset_flags() /* allocate/set/reset occupancy flags */ |
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static void |
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reset_flags(void) /* allocate/set/reset occupancy flags */ |
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{ |
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register int4 p; |
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register int32 p; |
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if (pixFlags == NULL) { |
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pixFlags = (int4 *)calloc(FL4NELS(hres*vres), sizeof(int4)); |
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pixFlags = (int32 *)calloc(FL4NELS(hres*vres), sizeof(int32)); |
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CHECK(pixFlags==NULL, SYSTEM, "out of memory in reset_flags"); |
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} else |
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CLR4ALL(pixFlags, hres*vres); |
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} |
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init_wfunc() /* initialize weighting function */ |
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static void |
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init_wfunc(void) /* initialize weighting function */ |
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{ |
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register int i, j; |
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register int4 r2; |
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register int r2; |
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register double d; |
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for (i = 1; i <= MAXRAD; i++) |
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for (j = 0; j <= i; j++) { |
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r2 = i*i + j*j; |
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if (r2 >= MAXRAD2) break; |
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d = sqrt((double)r2); |
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pixWeight[r2] = G0NORM/d; |
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isqrttab[r2] = d + 0.99; |
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} |
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for (r2 = MAXRAD2; --r2; ) { |
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d = sqrt((double)r2); |
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pixWeight[r2] = G0NORM/d; |
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isqrttab[r2] = d + 0.99; |
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} |
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pixWeight[0] = 1.; |
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isqrttab[0] = 0; |
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} |
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int |
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findneigh(nl, h, v, rnl) /* find NNEIGH neighbors for pixel */ |
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short nl[NNEIGH][2]; |
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int h, v; |
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register short (*rnl)[NNEIGH]; |
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static int |
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findneigh( /* find NNEIGH neighbors for pixel */ |
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short nl[NNEIGH][2], |
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int nd[NNEIGH], |
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int h, |
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int v, |
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register short (*rnl)[NNEIGH] |
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) |
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{ |
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int nn = 0; |
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int4 d, nd[NNEIGH]; |
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int n, hoff; |
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int d, n, hoff; |
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register int h2, n2; |
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nd[NNEIGH-1] = MAXRAD2; |
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for (hoff = 1; hoff < hres; hoff = (hoff<0) - hoff) { |
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for (hoff = 0; hoff < hres; hoff = (hoff<=0) - hoff) { |
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h2 = h + hoff; |
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if (h2 < 0 | h2 >= hres) |
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if ((h2 < 0) | (h2 >= hres)) |
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continue; |
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if ((h2-h)*(h2-h) >= nd[NNEIGH-1]) |
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break; |
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for (n = 0; n < NNEIGH && rnl[h2][n] < NINF; n++) { |
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d = (h2-h)*(h2-h) + (v-rnl[h2][n])*(v-rnl[h2][n]); |
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if (d >= nd[NNEIGH-1]) |
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if ((d == 0) | (d >= nd[NNEIGH-1])) |
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continue; |
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if (nn < NNEIGH) /* insert neighbor */ |
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nn++; |
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} |
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meet_neighbors(nf) /* run through samples and their neighbors */ |
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int (*nf)(); |
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static void |
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meet_neighbors( /* run through samples and their neighbors */ |
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int occ, |
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sampfunc *nf, |
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double *dp |
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) |
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{ |
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short ln[NNEIGH][2]; |
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int nd[NNEIGH]; |
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int h, v, n, v2; |
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register short (*rnl)[NNEIGH]; |
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/* initialize bottom row list */ |
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v = 0; /* do each row */ |
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for ( ; ; ) { |
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for (h = 0; h < hres; h++) { |
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< |
if (!CHK4(pixFlags, v*hres+h)) |
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continue; /* no one home */ |
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< |
n = findneigh(ln, h, v, rnl); |
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(*nf)(h, v, ln, n); /* call on neighbors */ |
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if (!CHK4(pixFlags, v*hres+h) != !occ) |
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continue; /* occupancy mismatch */ |
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/* find neighbors */ |
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n = findneigh(ln, nd, h, v, rnl); |
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/* call on neighbors */ |
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(*nf)(h, v, ln, nd, n, dp); |
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} |
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if (++v >= vres) /* reinitialize row list */ |
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break; |
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} |
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} |
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} |
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< |
free((char *)rnl); /* free row list */ |
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> |
free((void *)rnl); /* free row list */ |
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} |
