1 |
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 |
3.6 |
#include "random.h" |
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gwlarson |
3.1 |
|
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gwlarson |
3.2 |
#ifndef DEPS |
16 |
gwlarson |
3.3 |
#define DEPS 0.02 /* depth epsilon */ |
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gwlarson |
3.2 |
#endif |
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gwlarson |
3.3 |
#ifndef PEPS |
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#define PEPS 0.04 /* pixel value epsilon */ |
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#endif |
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gwlarson |
3.2 |
#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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gwlarson |
3.9 |
#define NNEIGH 5 /* find this many neighbors */ |
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gwlarson |
3.2 |
#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 |
3.3 |
static short isqrttab[MAXRAD2]; /* integer square root table */ |
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gwlarson |
3.2 |
|
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gwlarson |
3.9 |
#define isqrt(i2) (isqrttab[i2]) |
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gwlarson |
3.3 |
|
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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); |
106 |
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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gwlarson |
3.9 |
kill_occl(h, v, nl, nd, n) /* check for occlusion errors */ |
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gwlarson |
3.2 |
int h, v; |
117 |
gwlarson |
3.3 |
register short nl[NNEIGH][2]; |
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gwlarson |
3.9 |
int nd[NNEIGH]; |
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gwlarson |
3.2 |
int n; |
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{ |
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short forequad[2][2]; |
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int d; |
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gwlarson |
3.9 |
register int i; |
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register int4 p; |
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gwlarson |
3.2 |
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126 |
gwlarson |
3.5 |
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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gwlarson |
3.2 |
return(1); |
131 |
gwlarson |
3.5 |
} |
132 |
gwlarson |
3.3 |
p = v*hres + h; |
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gwlarson |
3.2 |
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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gwlarson |
3.9 |
d = isqrt(nd[i]); |
136 |
gwlarson |
3.3 |
if (mydepth[nl[i][1]*hres+nl[i][0]]*(1.+DEPS*d) < mydepth[p]) |
137 |
gwlarson |
3.2 |
forequad[nl[i][0]<h][nl[i][1]<v] = 1; |
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} |
139 |
gwlarson |
3.3 |
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 */ |
142 |
gwlarson |
3.2 |
} |
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return(1); |
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} |
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int |
148 |
gwlarson |
3.9 |
smooth_samp(h, v, nl, nd, n) /* grow sample point smoothly */ |
149 |
gwlarson |
3.2 |
int h, v; |
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register short nl[NNEIGH][2]; |
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gwlarson |
3.9 |
int nd[NNEIGH]; |
152 |
gwlarson |
3.2 |
int n; |
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{ |
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gwlarson |
3.3 |
int dis[NNEIGH], ndis; |
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gwlarson |
3.2 |
COLOR mykern[MAXRAD2]; |
156 |
gwlarson |
3.9 |
int maxr2; |
157 |
gwlarson |
3.5 |
double d; |
158 |
gwlarson |
3.9 |
register int4 p; |
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register int r2; |
160 |
gwlarson |
3.3 |
int i, r, maxr, h2, v2; |
161 |
gwlarson |
3.2 |
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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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gwlarson |
3.9 |
maxr2 = nd[n-1]; |
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gwlarson |
3.2 |
DCHECK(maxr2>=MAXRAD2, CONSISTENCY, "out of range neighbor"); |
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gwlarson |
3.3 |
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--; ) { |
177 |
gwlarson |
3.9 |
r = isqrt(nd[i]); |
178 |
gwlarson |
3.3 |
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; |
183 |
gwlarson |
3.2 |
} |
184 |
gwlarson |
3.3 |
/* stamp out that kernel */ |
185 |
gwlarson |
3.2 |
for (v2 = v-maxr; v2 <= v+maxr; v2++) { |
186 |
gwlarson |
3.3 |
if (v2 < 0) v2 = 0; |
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else if (v2 >= vres) break; |
188 |
gwlarson |
3.2 |
for (h2 = h-maxr; h2 <= h+maxr; h2++) { |
189 |
gwlarson |
3.3 |
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); |
192 |
gwlarson |
3.2 |
if (r2 > maxr2) continue; |
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if (CHK4(pixFlags, v2*hres+h2)) |
194 |
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continue; /* occupied */ |
195 |
gwlarson |
3.3 |
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 */ |
201 |
gwlarson |
3.2 |
addcolor(mypixel[v2*hres+h2], mykern[r2]); |
202 |
gwlarson |
3.5 |
myweight[v2*hres+h2] += pixWeight[r2] * myweight[p]; |
203 |
gwlarson |
3.2 |
} |
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} |
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return(1); |
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} |
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209 |
gwlarson |
3.6 |
int |
210 |
gwlarson |
3.9 |
random_samp(h, v, nl, nd, n, rf) /* gather samples randomly */ |
211 |
gwlarson |
3.6 |
int h, v; |
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register short nl[NNEIGH][2]; |
213 |
gwlarson |
3.9 |
int nd[NNEIGH]; |
214 |
gwlarson |
3.6 |
int n; |
215 |
gwlarson |
3.7 |
double *rf; |
216 |
gwlarson |
3.2 |
{ |
217 |
gwlarson |
3.9 |
float rnt[NNEIGH]; |
218 |
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double rvar; |
219 |
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register int4 p, pn; |
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register int ni; |
221 |
gwlarson |
3.6 |
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222 |
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if (n <= 0) |
223 |
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return(1); |
224 |
gwlarson |
3.9 |
p = v*hres + h; |
225 |
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if (*rf <= FTINY) /* straight Voronoi regions */ |
226 |
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ni = 0; |
227 |
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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++) |
231 |
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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++) |
234 |
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; |
235 |
gwlarson |
3.6 |
} |
236 |
gwlarson |
3.9 |
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]; |
239 |
gwlarson |
3.6 |
return(1); |
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} |
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243 |
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pixFinish(ransamp) /* done with beams -- compute pixel values */ |
244 |
gwlarson |
3.7 |
double ransamp; |
245 |
gwlarson |
3.6 |
{ |
246 |
gwlarson |
3.5 |
if (pixWeight[0] <= FTINY) |
247 |
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init_wfunc(); /* initialize weighting function */ |
248 |
gwlarson |
3.2 |
reset_flags(); /* set occupancy flags */ |
249 |
gwlarson |
3.9 |
meet_neighbors(1,kill_occl,NULL); /* identify occlusion errors */ |
250 |
gwlarson |
3.2 |
reset_flags(); /* reset occupancy flags */ |
251 |
gwlarson |
3.7 |
if (ransamp >= 0.) /* spread samples over image */ |
252 |
gwlarson |
3.9 |
meet_neighbors(0,random_samp,&ransamp); |
253 |
gwlarson |
3.6 |
else |
254 |
gwlarson |
3.9 |
meet_neighbors(1,smooth_samp,NULL); |
255 |
gwlarson |
3.2 |
free((char *)pixFlags); /* free pixel flags */ |
256 |
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pixFlags = NULL; |
257 |
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} |
258 |
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259 |
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260 |
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reset_flags() /* allocate/set/reset occupancy flags */ |
261 |
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{ |
262 |
gwlarson |
3.4 |
register int4 p; |
263 |
gwlarson |
3.2 |
|
264 |
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if (pixFlags == NULL) { |
265 |
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pixFlags = (int4 *)calloc(FL4NELS(hres*vres), sizeof(int4)); |
266 |
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CHECK(pixFlags==NULL, SYSTEM, "out of memory in reset_flags"); |
267 |
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} else |
268 |
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CLR4ALL(pixFlags, hres*vres); |
269 |
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for (p = hres*vres; p--; ) |
270 |
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if (myweight[p] > FTINY) |
271 |
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SET4(pixFlags, p); |
272 |
gwlarson |
3.4 |
} |
273 |
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274 |
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275 |
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init_wfunc() /* initialize weighting function */ |
276 |
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{ |
277 |
gwlarson |
3.9 |
register int r2; |
278 |
gwlarson |
3.4 |
register double d; |
279 |
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280 |
gwlarson |
3.6 |
for (r2 = MAXRAD2; --r2; ) { |
281 |
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d = sqrt((double)r2); |
282 |
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pixWeight[r2] = G0NORM/d; |
283 |
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isqrttab[r2] = d + 0.99; |
284 |
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} |
285 |
gwlarson |
3.4 |
pixWeight[0] = 1.; |
286 |
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isqrttab[0] = 0; |
287 |
gwlarson |
3.2 |
} |
288 |
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289 |
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290 |
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int |
291 |
gwlarson |
3.9 |
findneigh(nl, nd, h, v, rnl) /* find NNEIGH neighbors for pixel */ |
292 |
gwlarson |
3.2 |
short nl[NNEIGH][2]; |
293 |
gwlarson |
3.9 |
int nd[NNEIGH]; |
294 |
gwlarson |
3.2 |
int h, v; |
295 |
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register short (*rnl)[NNEIGH]; |
296 |
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{ |
297 |
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int nn = 0; |
298 |
gwlarson |
3.9 |
int d, n, hoff; |
299 |
gwlarson |
3.2 |
register int h2, n2; |
300 |
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301 |
gwlarson |
3.3 |
nd[NNEIGH-1] = MAXRAD2; |
302 |
gwlarson |
3.9 |
for (hoff = 0; hoff < hres; hoff = (hoff<=0) - hoff) { |
303 |
gwlarson |
3.2 |
h2 = h + hoff; |
304 |
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if (h2 < 0 | h2 >= hres) |
305 |
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continue; |
306 |
gwlarson |
3.3 |
if ((h2-h)*(h2-h) >= nd[NNEIGH-1]) |
307 |
gwlarson |
3.2 |
break; |
308 |
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for (n = 0; n < NNEIGH && rnl[h2][n] < NINF; n++) { |
309 |
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d = (h2-h)*(h2-h) + (v-rnl[h2][n])*(v-rnl[h2][n]); |
310 |
gwlarson |
3.9 |
if (d == 0 | d >= nd[NNEIGH-1]) |
311 |
gwlarson |
3.2 |
continue; |
312 |
gwlarson |
3.3 |
if (nn < NNEIGH) /* insert neighbor */ |
313 |
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nn++; |
314 |
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for (n2 = nn; n2--; ) { |
315 |
gwlarson |
3.2 |
if (!n2 || d >= nd[n2-1]) { |
316 |
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nd[n2] = d; |
317 |
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nl[n2][0] = h2; |
318 |
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nl[n2][1] = rnl[h2][n]; |
319 |
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break; |
320 |
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} |
321 |
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nd[n2] = nd[n2-1]; |
322 |
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nl[n2][0] = nl[n2-1][0]; |
323 |
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nl[n2][1] = nl[n2-1][1]; |
324 |
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} |
325 |
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} |
326 |
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} |
327 |
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return(nn); |
328 |
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} |
329 |
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330 |
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331 |
gwlarson |
3.9 |
meet_neighbors(occ, nf, dp) /* run through samples and their neighbors */ |
332 |
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int occ; |
333 |
gwlarson |
3.2 |
int (*nf)(); |
334 |
gwlarson |
3.7 |
char *dp; |
335 |
gwlarson |
3.2 |
{ |
336 |
|
|
short ln[NNEIGH][2]; |
337 |
gwlarson |
3.9 |
int nd[NNEIGH]; |
338 |
gwlarson |
3.2 |
int h, v, n, v2; |
339 |
|
|
register short (*rnl)[NNEIGH]; |
340 |
|
|
/* initialize bottom row list */ |
341 |
|
|
rnl = (short (*)[NNEIGH])malloc(NNEIGH*sizeof(short)*hres); |
342 |
|
|
CHECK(rnl==NULL, SYSTEM, "out of memory in meet_neighbors"); |
343 |
|
|
for (h = 0; h < hres; h++) { |
344 |
|
|
for (n = v = 0; v < vres; v++) |
345 |
|
|
if (CHK4(pixFlags, v*hres+h)) { |
346 |
|
|
rnl[h][n++] = v; |
347 |
|
|
if (n >= NNEIGH) |
348 |
|
|
break; |
349 |
|
|
} |
350 |
|
|
while (n < NNEIGH) |
351 |
|
|
rnl[h][n++] = NINF; |
352 |
|
|
} |
353 |
|
|
v = 0; /* do each row */ |
354 |
|
|
for ( ; ; ) { |
355 |
|
|
for (h = 0; h < hres; h++) { |
356 |
gwlarson |
3.9 |
if (!CHK4(pixFlags, v*hres+h) != !occ) |
357 |
|
|
continue; /* occupancy mismatch */ |
358 |
|
|
/* find neighbors */ |
359 |
|
|
n = findneigh(ln, nd, h, v, rnl); |
360 |
|
|
/* call on neighbors */ |
361 |
|
|
(*nf)(h, v, ln, nd, n, dp); |
362 |
gwlarson |
3.2 |
} |
363 |
|
|
if (++v >= vres) /* reinitialize row list */ |
364 |
|
|
break; |
365 |
|
|
for (h = 0; h < hres; h++) |
366 |
|
|
for (v2 = rnl[h][NNEIGH-1]+1; v2 < vres; v2++) { |
367 |
|
|
if (v2 - v > v - rnl[h][0]) |
368 |
|
|
break; /* not close enough */ |
369 |
|
|
if (CHK4(pixFlags, v2*hres+h)) { |
370 |
|
|
for (n = 0; n < NNEIGH-1; n++) |
371 |
|
|
rnl[h][n] = rnl[h][n+1]; |
372 |
|
|
rnl[h][NNEIGH-1] = v2; |
373 |
|
|
} |
374 |
|
|
} |
375 |
|
|
} |
376 |
|
|
free((char *)rnl); /* free row list */ |
377 |
gwlarson |
3.1 |
} |