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/* Copyright (c) 1999 Silicon Graphics, Inc. */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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#endif |
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|
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/* |
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* Rendering routines for rhpict. |
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*/ |
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|
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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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|
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#ifndef DEPS |
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#define DEPS 0.02 /* depth epsilon */ |
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#endif |
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#ifndef PEPS |
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#define PEPS 0.04 /* pixel value epsilon */ |
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#endif |
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#ifndef MAXRAD |
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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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#endif |
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|
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#define NINF 16382 |
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|
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#define MAXRAD2 (MAXRAD*MAXRAD+1) |
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|
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#define G0NORM 0.286 /* ground zero normalization (1/x integral) */ |
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|
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#ifndef FL4OP |
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#define FL4OP(f,i,op) ((f)[(i)>>5] op (1L<<((i)&0x1f))) |
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#define CHK4(f,i) FL4OP(f,i,&) |
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#define SET4(f,i) FL4OP(f,i,|=) |
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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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#endif |
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|
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static int4 *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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|
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#define isqrt(i2) ((int)isqrttab[(int)(i2)]) |
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|
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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 *myweight; /* weights (used to compute final pixels) */ |
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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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|
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|
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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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{ |
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GCOORD gc[2]; |
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register RAYVAL *rv; |
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FVECT rorg, rdir, wp, ip; |
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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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|
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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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for (n = bp->nrm, rv = hdbray(bp); n--; rv++) { |
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/* reproject each sample */ |
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hdray(rorg, rdir, hb->h, gc, rv->r); |
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if (rv->d < DCINF) { |
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d = hddepth(hb->h, rv->d); |
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VSUM(wp, rorg, rdir, d); |
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VSUB(ip, wp, myview.vp); |
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d = DOT(ip,rdir); |
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prox = d*d/DOT(ip,ip); /* cos(diff_angle)^32 */ |
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prox *= prox; prox *= prox; prox *= prox; prox *= prox; |
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} else { |
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if (myview.type == VT_PAR || myview.vaft > FTINY) |
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continue; /* inf. off view */ |
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VSUM(wp, myview.vp, rdir, FHUGE); |
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prox = 1.; |
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} |
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viewloc(ip, &myview, wp); /* frustum clipping */ |
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if (ip[2] < 0.) |
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continue; |
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if (ip[0] < 0. || ip[0] >= 1.) |
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continue; |
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if (ip[1] < 0. || ip[1] >= 1.) |
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continue; |
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if (myview.vaft > FTINY && ip[2] > myview.vaft - myview.vfore) |
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continue; /* not exact for VT_PER */ |
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p = (int)(ip[1]*vres)*hres + (int)(ip[0]*hres); |
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if (mydepth[p] > FTINY) { /* check depth */ |
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if (ip[2] > mydepth[p]*(1.+DEPS)) |
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continue; |
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if (ip[2] < mydepth[p]*(1.-DEPS)) { |
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setcolor(mypixel[p], 0., 0., 0.); |
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myweight[p] = 0.; |
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} |
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} |
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colr_color(col, rv->v); |
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scalecolor(col, prox); |
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addcolor(mypixel[p], col); |
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myweight[p] += prox; |
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mydepth[p] = ip[2]; |
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} |
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} |
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|
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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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{ |
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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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|
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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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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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if (forequad[0][0]+forequad[0][1]+forequad[1][0]+forequad[1][1] > 2) { |
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setcolor(mypixel[p], 0., 0., 0.); |
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myweight[p] = 0.; /* occupancy reset afterwards */ |
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} |
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return(1); |
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} |
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|
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|
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int |
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smooth_samp(h, v, nl, n) /* grow sample point smoothly */ |
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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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{ |
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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 d; |
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register int4 p, r2; |
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int i, r, maxr, h2, v2; |
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|
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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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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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for (h2 = 0; h2 <= v2; h2++) { |
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r2 = h2*h2 + v2*v2; |
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if (r2 > maxr2) break; |
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copycolor(mykern[r2], mypixel[p]); |
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scalecolor(mykern[r2], pixWeight[r2]); |
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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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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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mypixel[nl[i][1]*hres+nl[i][0]], r*PEPS)) |
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dis[ndis++] = i; |
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} |
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/* stamp out that kernel */ |
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for (v2 = v-maxr; v2 <= v+maxr; v2++) { |
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if (v2 < 0) v2 = 0; |
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else if (v2 >= vres) break; |
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for (h2 = h-maxr; h2 <= h+maxr; h2++) { |
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if (h2 < 0) h2 = 0; |
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else if (h2 >= hres) break; |
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r2 = (h2-h)*(h2-h) + (v2-v)*(v2-v); |
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if (r2 > maxr2) continue; |
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if (CHK4(pixFlags, v2*hres+h2)) |
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continue; /* occupied */ |
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for (i = ndis; i--; ) { |
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r = (h2-nl[dis[i]][0])*(h2-nl[dis[i]][0]) + |
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(v2-nl[dis[i]][1])*(v2-nl[dis[i]][1]); |
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if (r < r2) break; |
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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] * myweight[p]; |
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} |
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} |
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return(1); |
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} |
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|
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|
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int |
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random_samp(h, v, nl, n, rf) /* grow sample point noisily */ |
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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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double *rf; |
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{ |
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float nwt[NNEIGH]; |
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int4 maxr2; |
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register int4 p, r2; |
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register int i; |
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int maxr, h2, v2; |
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COLOR ctmp; |
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|
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if (n <= 0) |
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return(1); |
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p = v*hres + h; /* compute kernel radius */ |
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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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DCHECK(maxr2>=MAXRAD2, CONSISTENCY, "out of range neighbor"); |
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maxr = isqrt(maxr2); |
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/* compute neighbor weights */ |
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for (i = n; i--; ) { |
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r2 = (nl[i][0]-h)*(nl[i][0]-h) + (nl[i][1]-v)*(nl[i][1]-v); |
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nwt[i] = pixWeight[r2]; |
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} |
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/* sample kernel */ |
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for (v2 = v-maxr; v2 <= v+maxr; v2++) { |
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if (v2 < 0) v2 = 0; |
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else if (v2 >= vres) break; |
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for (h2 = h-maxr; h2 <= h+maxr; h2++) { |
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if (h2 < 0) h2 = 0; |
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else if (h2 >= hres) break; |
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r2 = (h2-h)*(h2-h) + (v2-v)*(v2-v); |
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if (r2 > maxr2) continue; |
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if (CHK4(pixFlags, v2*hres+h2)) |
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continue; /* occupied */ |
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if (frandom() < *rf) { /* pick neighbor instead */ |
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i = random() % n; |
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r2 = nl[i][1]*hres + nl[i][0]; |
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copycolor(ctmp, mypixel[r2]); |
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scalecolor(ctmp, nwt[i]); |
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addcolor(mypixel[v2*hres+h2], ctmp); |
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myweight[v2*hres+h2] += nwt[i] * myweight[r2]; |
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continue; |
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} |
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copycolor(ctmp, mypixel[p]); |
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scalecolor(ctmp, pixWeight[r2]); |
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addcolor(mypixel[v2*hres+h2], ctmp); |
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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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|
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|
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pixFinish(ransamp) /* done with beams -- compute pixel values */ |
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double ransamp; |
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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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reset_flags(); /* set occupancy flags */ |
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meet_neighbors(kill_occl,NULL); /* eliminate 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(random_samp,&ransamp); |
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else |
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meet_neighbors(smooth_samp,NULL); |
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free((char *)pixFlags); /* free pixel flags */ |
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pixFlags = NULL; |
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} |
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|
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|
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reset_flags() /* allocate/set/reset occupancy flags */ |
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{ |
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register int4 p; |
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|
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if (pixFlags == NULL) { |
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pixFlags = (int4 *)calloc(FL4NELS(hres*vres), sizeof(int4)); |
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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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for (p = hres*vres; p--; ) |
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if (myweight[p] > FTINY) |
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SET4(pixFlags, p); |
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} |
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|
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|
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init_wfunc() /* initialize weighting function */ |
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{ |
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register int4 r2; |
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register double d; |
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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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|
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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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{ |
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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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register int h2, n2; |
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|
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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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h2 = h + hoff; |
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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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continue; |
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if (nn < NNEIGH) /* insert neighbor */ |
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nn++; |
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for (n2 = nn; n2--; ) { |
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if (!n2 || d >= nd[n2-1]) { |
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nd[n2] = d; |
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nl[n2][0] = h2; |
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nl[n2][1] = rnl[h2][n]; |
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break; |
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} |
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nd[n2] = nd[n2-1]; |
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nl[n2][0] = nl[n2-1][0]; |
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nl[n2][1] = nl[n2-1][1]; |
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} |
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} |
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} |
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return(nn); |
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} |
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|
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|
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meet_neighbors(nf, dp) /* run through samples and their neighbors */ |
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int (*nf)(); |
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char *dp; |
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{ |
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short ln[NNEIGH][2]; |
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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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rnl = (short (*)[NNEIGH])malloc(NNEIGH*sizeof(short)*hres); |
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CHECK(rnl==NULL, SYSTEM, "out of memory in meet_neighbors"); |
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for (h = 0; h < hres; h++) { |
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for (n = v = 0; v < vres; v++) |
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if (CHK4(pixFlags, v*hres+h)) { |
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rnl[h][n++] = v; |
| 364 |
if (n >= NNEIGH) |
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break; |
| 366 |
} |
| 367 |
while (n < NNEIGH) |
| 368 |
rnl[h][n++] = NINF; |
| 369 |
} |
| 370 |
v = 0; /* do each row */ |
| 371 |
for ( ; ; ) { |
| 372 |
for (h = 0; h < hres; h++) { |
| 373 |
if (!CHK4(pixFlags, v*hres+h)) |
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continue; /* no one home */ |
| 375 |
n = findneigh(ln, h, v, rnl); |
| 376 |
(*nf)(h, v, ln, n, dp); /* call on neighbors */ |
| 377 |
} |
| 378 |
if (++v >= vres) /* reinitialize row list */ |
| 379 |
break; |
| 380 |
for (h = 0; h < hres; h++) |
| 381 |
for (v2 = rnl[h][NNEIGH-1]+1; v2 < vres; v2++) { |
| 382 |
if (v2 - v > v - rnl[h][0]) |
| 383 |
break; /* not close enough */ |
| 384 |
if (CHK4(pixFlags, v2*hres+h)) { |
| 385 |
for (n = 0; n < NNEIGH-1; n++) |
| 386 |
rnl[h][n] = rnl[h][n+1]; |
| 387 |
rnl[h][NNEIGH-1] = v2; |
| 388 |
} |
| 389 |
} |
| 390 |
} |
| 391 |
free((char *)rnl); /* free row list */ |
| 392 |
} |
