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gwlarson |
3.1 |
/* 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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#endif
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/*
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* Rendering routines for rhpict.
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*/
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#include "holo.h"
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#include "view.h"
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gwlarson |
3.2 |
#ifndef DEPS
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#define DEPS 0.01 /* depth 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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#define NINF 16382
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#define MAXRAD2 (MAXRAD*MAXRAD+1)
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#define G0NORM 0.286 /* ground zero normalization (1/x integral) */
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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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static int4 *pixFlags; /* pixel occupancy flags */
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static float pixWeight[MAXRAD2]; /* pixel weighting function */
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gwlarson |
3.1 |
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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gwlarson |
3.2 |
extern float *mydepth; /* depth values (visibility culling) */
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gwlarson |
3.1 |
extern int hres, vres; /* current horizontal and vertical res. */
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gwlarson |
3.2 |
pixBeam(bp, hb) /* render a particular beam */
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gwlarson |
3.1 |
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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gwlarson |
3.2 |
int n;
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register int4 p;
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gwlarson |
3.1 |
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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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gwlarson |
3.2 |
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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gwlarson |
3.1 |
} 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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gwlarson |
3.2 |
prox = 1.;
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gwlarson |
3.1 |
}
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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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gwlarson |
3.2 |
continue; /* not exact for VT_PER */
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gwlarson |
3.1 |
p = (int)(ip[1]*vres)*hres + (int)(ip[0]*hres);
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gwlarson |
3.2 |
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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gwlarson |
3.1 |
colr_color(col, rv->v);
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gwlarson |
3.2 |
scalecolor(col, prox);
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gwlarson |
3.1 |
addcolor(mypixel[p], col);
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gwlarson |
3.2 |
myweight[p] += prox;
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mydepth[p] = ip[2];
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gwlarson |
3.1 |
}
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gwlarson |
3.2 |
}
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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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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;
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if (n <= 0)
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return(1);
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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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if (mydepth[nl[i][1]*hres+nl[i][0]] <
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mydepth[v*hres+h]*(1.-DEPS*d))
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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] > 1) {
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i = v*hres + h;
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setcolor(mypixel[i], 0., 0., 0.);
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myweight[i] = 0.; /* occupancy reset afterwards */
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}
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return(1);
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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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{
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COLOR mykern[MAXRAD2];
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float mykw[MAXRAD2];
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int4 maxr2;
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double w;
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register int4 p, r2;
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int 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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DCHECK(maxr2>=MAXRAD2, CONSISTENCY, "out of range neighbor");
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for (r2 = maxr2+1; --r2; ) {
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copycolor(mykern[r2], mypixel[p]);
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mykw[r2] = pixWeight[r2];
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if (2*r2 >= maxr2) /* soften skirt */
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mykw[r2] *= (2*(maxr2-r2)+1.0)/maxr2;
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scalecolor(mykern[r2], mykw[r2]);
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}
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maxr = sqrt((double)maxr2) + .99; /* stamp out that kernel */
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for (v2 = v-maxr; v2 <= v+maxr; v2++) {
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if (v2 < 0) continue;
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if (v2 >= vres) break;
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for (h2 = h-maxr; h2 <= h+maxr; h2++) {
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if (h2 < 0) continue;
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if (h2 >= hres) break;
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r2 = (v2-v)*(v2-v) + (h2-h)*(h2-h);
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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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addcolor(mypixel[v2*hres+h2], mykern[r2]);
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myweight[v2*hres+h2] += mykw[r2]*myweight[v*hres+h];
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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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{
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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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if (pixWeight[0] <= FTINY) { /* initialize weighting function */
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register int r;
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for (r = MAXRAD2; --r; )
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pixWeight[r] = G0NORM/sqrt((double)r);
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pixWeight[0] = 1.;
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}
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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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pixFlags = NULL;
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}
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reset_flags() /* allocate/set/reset occupancy flags */
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{
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register int p;
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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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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, ld, nd[NNEIGH+1];
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int n, hoff;
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register int h2, n2;
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ld = 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) >= ld)
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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 >= ld)
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continue;
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for (n2 = nn; ; n2--) { /* insert neighbor */
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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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if (nn < NNEIGH)
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nn++;
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else
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ld = nd[NNEIGH-1];
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}
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}
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return(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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{
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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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| 263 |
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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;
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if (n >= NNEIGH)
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break;
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| 269 |
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}
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| 270 |
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while (n < NNEIGH)
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rnl[h][n++] = NINF;
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| 272 |
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}
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| 273 |
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v = 0; /* do each row */
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| 274 |
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for ( ; ; ) {
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| 275 |
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for (h = 0; h < hres; h++) {
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| 276 |
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if (!CHK4(pixFlags, v*hres+h))
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| 277 |
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continue; /* no one home */
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| 278 |
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n = findneigh(ln, h, v, rnl);
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| 279 |
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(*nf)(h, v, ln, n); /* call on neighbors */
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| 280 |
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}
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| 281 |
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if (++v >= vres) /* reinitialize row list */
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| 282 |
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break;
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| 283 |
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for (h = 0; h < hres; h++)
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| 284 |
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for (v2 = rnl[h][NNEIGH-1]+1; v2 < vres; v2++) {
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| 285 |
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if (v2 - v > v - rnl[h][0])
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| 286 |
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break; /* not close enough */
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| 287 |
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if (CHK4(pixFlags, v2*hres+h)) {
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| 288 |
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for (n = 0; n < NNEIGH-1; n++)
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| 289 |
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rnl[h][n] = rnl[h][n+1];
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| 290 |
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rnl[h][NNEIGH-1] = v2;
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| 291 |
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}
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| 292 |
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}
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| 293 |
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}
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| 294 |
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free((char *)rnl); /* free row list */
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| 295 |
gwlarson |
3.1 |
}
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