| 1 |
– |
/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
| 2 |
– |
|
| 1 |
|
#ifndef lint |
| 2 |
< |
static char SCCSid[] = "$SunId$ SGI"; |
| 2 |
> |
static const char RCSid[] = "$Id$"; |
| 3 |
|
#endif |
| 6 |
– |
|
| 4 |
|
/* |
| 5 |
|
* Holodeck beam support for display process |
| 6 |
|
*/ |
| 16 |
|
|
| 17 |
|
|
| 18 |
|
int |
| 19 |
< |
npixels(vp, hr, vr, hp, bi) /* compute appropriate number to evaluate */ |
| 19 |
> |
npixels(vp, hr, vr, hp, bi) /* compute appropriate nrays to evaluate */ |
| 20 |
|
register VIEW *vp; |
| 21 |
|
int hr, vr; |
| 22 |
|
HOLO *hp; |
| 24 |
|
{ |
| 25 |
|
VIEW vrev; |
| 26 |
|
GCOORD gc[2]; |
| 27 |
< |
FVECT cp[4], ip[4]; |
| 28 |
< |
double af, ab; |
| 27 |
> |
FVECT cp[4], ip[4], pf, pb; |
| 28 |
> |
double af, ab, sf2, sb2, dfb2, df2, db2, penalty; |
| 29 |
|
register int i; |
| 30 |
+ |
/* special case */ |
| 31 |
+ |
if (hr <= 0 | vr <= 0) |
| 32 |
+ |
return(0); |
| 33 |
|
/* compute cell corners in image */ |
| 34 |
|
if (!hdbcoord(gc, hp, bi)) |
| 35 |
|
error(CONSISTENCY, "bad beam index in npixels"); |
| 36 |
|
hdcell(cp, hp, gc+1); /* find cell on front image */ |
| 37 |
< |
for (i = 0; i < 4; i++) { |
| 37 |
> |
for (i = 3; i--; ) /* compute front center */ |
| 38 |
> |
pf[i] = 0.5*(cp[0][i] + cp[2][i]); |
| 39 |
> |
sf2 = 0.25*dist2(cp[0], cp[2]); /* compute half diagonal length */ |
| 40 |
> |
for (i = 0; i < 4; i++) { /* compute visible quad */ |
| 41 |
|
viewloc(ip[i], vp, cp[i]); |
| 42 |
|
if (ip[i][2] < 0.) { |
| 43 |
|
af = 0; |
| 51 |
|
(ip[2][0]-ip[0][0])*(ip[1][1]-ip[0][1]); |
| 52 |
|
af += (ip[2][0]-ip[3][0])*(ip[1][1]-ip[3][1]) - |
| 53 |
|
(ip[1][0]-ip[3][0])*(ip[2][1]-ip[3][1]); |
| 54 |
< |
if (af >= 0) af *= 0.5; |
| 52 |
< |
else af *= -0.5; |
| 54 |
> |
af *= af >= 0 ? 0.5 : -0.5; |
| 55 |
|
getback: |
| 56 |
< |
copystruct(&vrev, vp); /* compute reverse view */ |
| 56 |
> |
vrev = *vp; /* compute reverse view */ |
| 57 |
|
for (i = 0; i < 3; i++) { |
| 58 |
|
vrev.vdir[i] = -vp->vdir[i]; |
| 59 |
|
vrev.vup[i] = -vp->vup[i]; |
| 61 |
|
vrev.vvec[i] = -vp->vvec[i]; |
| 62 |
|
} |
| 63 |
|
hdcell(cp, hp, gc); /* find cell on back image */ |
| 64 |
< |
for (i = 0; i < 4; i++) { |
| 64 |
> |
for (i = 3; i--; ) /* compute rear center */ |
| 65 |
> |
pb[i] = 0.5*(cp[0][i] + cp[2][i]); |
| 66 |
> |
sb2 = 0.25*dist2(cp[0], cp[2]); /* compute half diagonal length */ |
| 67 |
> |
for (i = 0; i < 4; i++) { /* compute visible quad */ |
| 68 |
|
viewloc(ip[i], &vrev, cp[i]); |
| 69 |
< |
if (ip[i][2] < 0.) |
| 70 |
< |
return((int)(af + 0.5)); |
| 69 |
> |
if (ip[i][2] < 0.) { |
| 70 |
> |
ab = 0; |
| 71 |
> |
goto finish; |
| 72 |
> |
} |
| 73 |
|
ip[i][0] *= (double)hr; /* scale by resolution */ |
| 74 |
|
ip[i][1] *= (double)vr; |
| 75 |
|
} |
| 78 |
|
(ip[2][0]-ip[0][0])*(ip[1][1]-ip[0][1]); |
| 79 |
|
ab += (ip[2][0]-ip[3][0])*(ip[1][1]-ip[3][1]) - |
| 80 |
|
(ip[1][0]-ip[3][0])*(ip[2][1]-ip[3][1]); |
| 81 |
< |
if (ab >= 0) ab *= 0.5; |
| 82 |
< |
else ab *= -0.5; |
| 83 |
< |
/* round off smaller area */ |
| 84 |
< |
if (af <= ab) |
| 85 |
< |
return((int)(af + 0.5)); |
| 86 |
< |
return((int)(ab + 0.5)); |
| 81 |
> |
ab *= ab >= 0 ? 0.5 : -0.5; |
| 82 |
> |
finish: /* compute penalty based on dist. sightline - viewpoint */ |
| 83 |
> |
df2 = dist2(vp->vp, pf); |
| 84 |
> |
db2 = dist2(vp->vp, pb); |
| 85 |
> |
dfb2 = dist2(pf, pb); |
| 86 |
> |
penalty = dfb2 + df2 - db2; |
| 87 |
> |
penalty = df2 - 0.25*penalty*penalty/dfb2; |
| 88 |
> |
if (df2 > db2) penalty /= df2 <= dfb2 ? sb2 : sb2*df2/dfb2; |
| 89 |
> |
else penalty /= db2 <= dfb2 ? sf2 : sf2*db2/dfb2; |
| 90 |
> |
if (penalty < 1.) penalty = 1.; |
| 91 |
> |
/* round off smaller non-zero area */ |
| 92 |
> |
if (ab <= FTINY || (af > FTINY && af <= ab)) |
| 93 |
> |
return((int)(af/penalty + 0.5)); |
| 94 |
> |
return((int)(ab/penalty + 0.5)); |
| 95 |
|
} |
| 96 |
|
|
| 97 |
|
|
| 130 |
|
if (!(inflags & 1<<gc.w)) /* origin on wrong side */ |
| 131 |
|
continue; |
| 132 |
|
/* scanline algorithm */ |
| 133 |
< |
for (gc.i[1] = hp->grid[((gc.w>>1)+2)%3]; gc.i[1]--; ) { |
| 133 |
> |
for (gc.i[1] = hp->grid[hdwg1[gc.w]]; gc.i[1]--; ) { |
| 134 |
|
/* compute scanline */ |
| 135 |
|
gp[gc.w>>1] = gc.w&1 ? hp->grid[gc.w>>1] : 0; |
| 136 |
< |
gp[((gc.w>>1)+1)%3] = 0; |
| 137 |
< |
gp[((gc.w>>1)+2)%3] = gc.i[1] + 0.5; |
| 136 |
> |
gp[hdwg0[gc.w]] = 0; |
| 137 |
> |
gp[hdwg1[gc.w]] = gc.i[1] + 0.5; |
| 138 |
|
hdworld(lo, hp, gp); |
| 139 |
< |
gp[((gc.w>>1)+1)%3] = 1; |
| 139 |
> |
gp[hdwg0[gc.w]] = 1; |
| 140 |
|
hdworld(ld, hp, gp); |
| 141 |
|
ld[0] -= lo[0]; ld[1] -= lo[1]; ld[2] -= lo[2]; |
| 142 |
|
/* find scanline limits */ |
| 143 |
< |
lbeg = 0; lend = hp->grid[((gc.w>>1)+1)%3]; |
| 143 |
> |
lbeg = 0; lend = hp->grid[hdwg0[gc.w]]; |
| 144 |
|
for (i = 0; i < 4; i++) { |
| 145 |
|
t = DOT(pn[i], lo) - po[i]; |
| 146 |
|
d = -DOT(pn[i], ld); |
| 239 |
|
GCOORD *gcp; |
| 240 |
|
register struct cellist *cl; |
| 241 |
|
{ |
| 242 |
< |
copystruct(cl->cl+cl->n, gcp); |
| 242 |
> |
*(cl->cl+cl->n) = *gcp; |
| 243 |
|
cl->n++; |
| 244 |
|
return(1); |
| 245 |
|
} |
| 281 |
|
if (cl.cl == NULL) |
| 282 |
|
goto memerr; |
| 283 |
|
cl.n = 0; /* add cells within pyramid */ |
| 284 |
< |
visit_cells(org, dir, hp, addcell, &cl); |
| 284 |
> |
visit_cells(org, dir, hp, addcell, (char *)&cl); |
| 285 |
|
if (!cl.n) { |
| 286 |
< |
free((char *)cl.cl); |
| 286 |
> |
free((void *)cl.cl); |
| 287 |
|
return(NULL); |
| 288 |
|
} |
| 289 |
|
*np = cl.n * orient; |
| 292 |
|
* sorted automatically by visit_cells(), so we don't need this. |
| 293 |
|
*/ |
| 294 |
|
/* optimize memory use */ |
| 295 |
< |
cl.cl = (GCOORD *)realloc((char *)cl.cl, cl.n*sizeof(GCOORD)); |
| 295 |
> |
cl.cl = (GCOORD *)realloc((void *)cl.cl, cl.n*sizeof(GCOORD)); |
| 296 |
|
if (cl.cl == NULL) |
| 297 |
|
goto memerr; |
| 298 |
|
/* sort the list */ |
| 314 |
|
/* do each wall on each section */ |
| 315 |
|
for (hd = 0; hdlist[hd] != NULL; hd++) |
| 316 |
|
for (w = 0; w < 6; w++) { |
| 317 |
< |
g0 = ((w>>1)+1)%3; |
| 318 |
< |
g1 = ((w>>1)+2)%3; |
| 317 |
> |
g0 = hdwg0[w]; |
| 318 |
> |
g1 = hdwg1[w]; |
| 319 |
|
d = 1.0/hdlist[hd]->grid[g0]; |
| 320 |
|
mov[0] = d * hdlist[hd]->xv[g0][0]; |
| 321 |
|
mov[1] = d * hdlist[hd]->xv[g0][1]; |