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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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float hd_depthmap[DCINF-DCLIN]; |
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|
17 |
+ |
int hdwg0[6] = {1,1,2,2,0,0}; |
18 |
+ |
int hdwg1[6] = {2,2,0,0,1,1}; |
19 |
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|
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static double logstep; |
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|
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static int wg0[6] = {1,1,2,2,0,0}; |
20 |
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static int wg1[6] = {2,2,0,0,1,1}; |
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|
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|
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hdcompgrid(hp) /* compute derived grid vector and index */ |
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register HOLO *hp; |
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{ |
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FVECT AxB; |
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double d; |
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register FLOAT *v; |
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register int i, j; |
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/* initialize depth map */ |
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if (hd_depthmap[0] < 1.) { |
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} |
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/* compute grid coordinate vectors */ |
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for (i = 0; i < 3; i++) { |
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< |
fcross(AxB, hp->xv[(i+1)%3], v=hp->xv[(i+2)%3]); |
40 |
< |
VCOPY(hp->wn[i], AxB); |
41 |
< |
if (normalize(hp->wn[i]) == 0.) |
39 |
> |
fcross(hp->wg[i], hp->xv[(i+1)%3], hp->xv[(i+2)%3]); |
40 |
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d = DOT(hp->wg[i],hp->xv[i]); |
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if (d <= FTINY & d >= -FTINY) |
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error(USER, "degenerate holodeck section"); |
43 |
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hp->wo[i<<1] = DOT(hp->wn[i],hp->orig); |
44 |
< |
hp->wo[i<<1|1] = hp->wo[i<<1] + DOT(hp->wn[i],hp->xv[i]); |
47 |
< |
fcross(hp->gv[i][0], v, AxB); |
48 |
< |
d = DOT(v,v) / DOT(hp->gv[i][0],hp->gv[i][0]) * |
49 |
< |
hp->grid[(i+1)%3]; |
50 |
< |
for (j = 0; j < 3; j++) |
51 |
< |
hp->gv[i][0][j] *= d; |
52 |
< |
fcross(hp->gv[i][1], AxB, v=hp->xv[(i+1)%3]); |
53 |
< |
d = DOT(v,v) / DOT(hp->gv[i][1],hp->gv[i][1]) * |
54 |
< |
hp->grid[(i+2)%3]; |
55 |
< |
for (j = 0; j < 3; j++) |
56 |
< |
hp->gv[i][1][j] *= d; |
43 |
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d = hp->grid[i] / d; |
44 |
> |
hp->wg[i][0] *= d; hp->wg[i][1] *= d; hp->wg[i][2] *= d; |
45 |
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} |
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/* compute linear depth range */ |
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hp->tlin = VLEN(hp->xv[0]) + VLEN(hp->xv[1]) + VLEN(hp->xv[2]); |
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for (i = 1; i < 6; i++) { |
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hp->wi[i] = 0; |
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for (j = i; j < 6; j++) |
53 |
< |
hp->wi[i] += hp->grid[wg0[j]] * hp->grid[wg1[j]]; |
54 |
< |
hp->wi[i] *= hp->grid[wg0[i-1]] * hp->grid[wg1[i-1]]; |
53 |
> |
hp->wi[i] += hp->grid[hdwg0[j]] * hp->grid[hdwg1[j]]; |
54 |
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hp->wi[i] *= hp->grid[hdwg0[i-1]] * hp->grid[hdwg1[i-1]]; |
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hp->wi[i] += hp->wi[i-1]; |
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} |
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} |
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HOLO * |
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hdalloc(hproto) /* allocate and set holodeck section based on grid */ |
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HDGRID *hproto; |
75 |
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{ |
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HOLO hdhead; |
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register HOLO *hp; |
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int n; |
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/* copy grid to temporary header */ |
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bcopy((char *)hproto, (char *)&hdhead, sizeof(HDGRID)); |
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/* compute grid vectors and sizes */ |
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hdcompgrid(&hdhead); |
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/* allocate header with directory */ |
84 |
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n = sizeof(HOLO)+nbeams(&hdhead)*sizeof(BEAMI); |
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if ((hp = (HOLO *)malloc(n)) == NULL) |
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return(NULL); |
87 |
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/* copy header information */ |
88 |
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copystruct(hp, &hdhead); |
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/* allocate and clear beam list */ |
90 |
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hp->bl = (BEAM **)malloc((nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
91 |
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if (hp->bl == NULL) { |
92 |
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free((char *)hp); |
93 |
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return(NULL); |
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} |
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bzero((char *)hp->bl, (nbeams(hp)+1)*sizeof(BEAM *)+sizeof(BEAM)); |
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hp->bl[0] = (BEAM *)(hp->bl+nbeams(hp)+1); /* set blglob(hp) */ |
97 |
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hp->fd = -1; |
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hp->dirty = 0; |
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hp->priv = NULL; |
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/* clear beam directory */ |
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bzero((char *)hp->bi, (nbeams(hp)+1)*sizeof(BEAMI)); |
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return(hp); /* all is well */ |
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} |
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|
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|
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hdbcoord(gc, hp, i) /* compute beam coordinates from index */ |
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GCOORD gc[2]; /* returned */ |
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register HOLO *hp; |
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break; |
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i -= hp->wi[gc[0].w=j]; |
77 |
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/* find w1 */ |
78 |
< |
n2 = hp->grid[wg0[j]] * hp->grid[wg1[j]]; |
78 |
> |
n2 = hp->grid[hdwg0[j]] * hp->grid[hdwg1[j]]; |
79 |
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while (++j < 5) { |
80 |
< |
n = n2 * hp->grid[wg0[j]] * hp->grid[wg1[j]]; |
80 |
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n = n2 * hp->grid[hdwg0[j]] * hp->grid[hdwg1[j]]; |
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if (n > i) |
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break; |
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i -= n; |
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} |
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gc[1].w = j; |
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/* find position on w0 */ |
87 |
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n2 = hp->grid[wg0[j]] * hp->grid[wg1[j]]; |
87 |
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n2 = hp->grid[hdwg0[j]] * hp->grid[hdwg1[j]]; |
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n = i / n2; |
89 |
< |
gc[0].i[1] = n / hp->grid[wg0[gc[0].w]]; |
90 |
< |
gc[0].i[0] = n - gc[0].i[1]*hp->grid[wg0[gc[0].w]]; |
89 |
> |
gc[0].i[1] = n / hp->grid[hdwg0[gc[0].w]]; |
90 |
> |
gc[0].i[0] = n - gc[0].i[1]*hp->grid[hdwg0[gc[0].w]]; |
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i -= n*n2; |
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/* find position on w1 */ |
93 |
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gc[1].i[1] = i / hp->grid[wg0[gc[1].w]]; |
94 |
< |
gc[1].i[0] = i - gc[1].i[1]*hp->grid[wg0[gc[1].w]]; |
93 |
> |
gc[1].i[1] = i / hp->grid[hdwg0[gc[1].w]]; |
94 |
> |
gc[1].i[0] = i - gc[1].i[1]*hp->grid[hdwg0[gc[1].w]]; |
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if (reverse) { |
96 |
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copystruct(g2, gc+1); |
97 |
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copystruct(gc+1, gc); |
120 |
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return(0); |
121 |
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i = 0; /* compute index */ |
122 |
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for (j = gc[0].w+1; j < gc[1].w; j++) |
123 |
< |
i += hp->grid[wg0[j]] * hp->grid[wg1[j]]; |
124 |
< |
i *= hp->grid[wg0[gc[0].w]] * hp->grid[wg1[gc[0].w]]; |
123 |
> |
i += hp->grid[hdwg0[j]] * hp->grid[hdwg1[j]]; |
124 |
> |
i *= hp->grid[hdwg0[gc[0].w]] * hp->grid[hdwg1[gc[0].w]]; |
125 |
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i += hp->wi[gc[0].w]; |
126 |
< |
i += (hp->grid[wg0[gc[0].w]]*gc[0].i[1] + gc[0].i[0]) * |
127 |
< |
hp->grid[wg0[gc[1].w]] * hp->grid[wg1[gc[1].w]] ; |
128 |
< |
i += hp->grid[wg0[gc[1].w]]*gc[1].i[1] + gc[1].i[0]; |
126 |
> |
i += (hp->grid[hdwg0[gc[0].w]]*gc[0].i[1] + gc[0].i[0]) * |
127 |
> |
hp->grid[hdwg0[gc[1].w]] * hp->grid[hdwg1[gc[1].w]] ; |
128 |
> |
i += hp->grid[hdwg0[gc[1].w]]*gc[1].i[1] + gc[1].i[0]; |
129 |
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if (reverse) |
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i += hp->wi[5] - 1; |
131 |
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return(i); |
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135 |
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hdcell(cp, hp, gc) /* compute cell coordinates */ |
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register FVECT cp[4]; /* returned (may be passed as FVECT cp[2][2]) */ |
137 |
< |
HOLO *hp; |
137 |
> |
register HOLO *hp; |
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register GCOORD *gc; |
139 |
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{ |
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register int i; |
140 |
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register FLOAT *v; |
141 |
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double d; |
142 |
< |
/* compute each corner */ |
143 |
< |
for (i = 0; i < 4; i++) { |
144 |
< |
VCOPY(cp[i], hp->orig); |
145 |
< |
if (gc->w & 1) { |
146 |
< |
v = hp->xv[gc->w>>1]; |
194 |
< |
cp[i][0] += *v++; cp[i][1] += *v++; cp[i][2] += *v; |
195 |
< |
} |
196 |
< |
d = (double)( gc->i[0] + (i&1) ) / hp->grid[wg0[gc->w]]; |
197 |
< |
v = hp->xv[wg0[gc->w]]; |
198 |
< |
cp[i][0] += d * *v++; cp[i][1] += d * *v++; cp[i][2] += d * *v; |
199 |
< |
|
200 |
< |
d = (double)( gc->i[1] + (i>>1) ) / hp->grid[wg1[gc->w]]; |
201 |
< |
v = hp->xv[wg1[gc->w]]; |
202 |
< |
cp[i][0] += d * *v++; cp[i][1] += d * *v++; cp[i][2] += d * *v; |
142 |
> |
/* compute common component */ |
143 |
> |
VCOPY(cp[0], hp->orig); |
144 |
> |
if (gc->w & 1) { |
145 |
> |
v = hp->xv[gc->w>>1]; |
146 |
> |
cp[0][0] += v[0]; cp[0][1] += v[1]; cp[0][2] += v[2]; |
147 |
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} |
148 |
+ |
v = hp->xv[hdwg0[gc->w]]; |
149 |
+ |
d = (double)gc->i[0] / hp->grid[hdwg0[gc->w]]; |
150 |
+ |
VSUM(cp[0], cp[0], v, d); |
151 |
+ |
v = hp->xv[hdwg1[gc->w]]; |
152 |
+ |
d = (double)gc->i[1] / hp->grid[hdwg1[gc->w]]; |
153 |
+ |
VSUM(cp[0], cp[0], v, d); |
154 |
+ |
/* compute x1 sums */ |
155 |
+ |
v = hp->xv[hdwg0[gc->w]]; |
156 |
+ |
d = 1.0 / hp->grid[hdwg0[gc->w]]; |
157 |
+ |
VSUM(cp[1], cp[0], v, d); |
158 |
+ |
VSUM(cp[3], cp[0], v, d); |
159 |
+ |
/* compute y1 sums */ |
160 |
+ |
v = hp->xv[hdwg1[gc->w]]; |
161 |
+ |
d = 1.0 / hp->grid[hdwg1[gc->w]]; |
162 |
+ |
VSUM(cp[2], cp[0], v, d); |
163 |
+ |
VSUM(cp[3], cp[3], v, d); |
164 |
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} |
165 |
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166 |
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|
167 |
< |
hdlseg(lseg, hp, i) /* compute line segment for beam */ |
167 |
> |
hdlseg(lseg, hp, gc) /* compute line segment for beam */ |
168 |
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register int lseg[2][3]; |
169 |
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register HOLO *hp; |
170 |
< |
int i; |
170 |
> |
GCOORD gc[2]; |
171 |
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{ |
212 |
– |
GCOORD gc[2]; |
172 |
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register int k; |
173 |
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|
215 |
– |
if (!hdbcoord(gc, hp, i)) /* compute grid coordinates */ |
216 |
– |
return(0); |
174 |
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for (k = 0; k < 2; k++) { /* compute end points */ |
175 |
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lseg[k][gc[k].w>>1] = gc[k].w&1 ? hp->grid[gc[k].w>>1]-1 : 0 ; |
176 |
< |
lseg[k][wg0[gc[k].w]] = gc[k].i[0]; |
177 |
< |
lseg[k][wg1[gc[k].w]] = gc[k].i[1]; |
176 |
> |
lseg[k][hdwg0[gc[k].w]] = gc[k].i[0]; |
177 |
> |
lseg[k][hdwg1[gc[k].w]] = gc[k].i[1]; |
178 |
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} |
179 |
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return(1); |
180 |
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} |
186 |
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double d; |
187 |
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{ |
188 |
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double tl = hp->tlin; |
189 |
< |
register unsigned c; |
189 |
> |
register long c; |
190 |
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|
191 |
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if (d <= 0.) |
192 |
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return(0); |
194 |
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return(DCINF); |
195 |
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if (d < tl) |
196 |
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return((unsigned)(d*DCLIN/tl)); |
197 |
< |
c = (unsigned)(log(d/tl)/logstep) + DCLIN; |
198 |
< |
return(c > DCINF ? DCINF : c); |
197 |
> |
c = (long)(log(d/tl)/logstep) + DCLIN; |
198 |
> |
return(c > DCINF ? (unsigned)DCINF : (unsigned)c); |
199 |
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} |
200 |
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|
201 |
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|
202 |
+ |
hdgrid(gp, hp, wp) /* compute grid coordinates */ |
203 |
+ |
FVECT gp; /* returned */ |
204 |
+ |
register HOLO *hp; |
205 |
+ |
FVECT wp; |
206 |
+ |
{ |
207 |
+ |
FVECT vt; |
208 |
+ |
|
209 |
+ |
VSUB(vt, wp, hp->orig); |
210 |
+ |
gp[0] = DOT(vt, hp->wg[0]); |
211 |
+ |
gp[1] = DOT(vt, hp->wg[1]); |
212 |
+ |
gp[2] = DOT(vt, hp->wg[2]); |
213 |
+ |
} |
214 |
+ |
|
215 |
+ |
|
216 |
+ |
hdworld(wp, hp, gp) /* compute world coordinates */ |
217 |
+ |
register FVECT wp; |
218 |
+ |
register HOLO *hp; |
219 |
+ |
FVECT gp; |
220 |
+ |
{ |
221 |
+ |
register double d; |
222 |
+ |
|
223 |
+ |
d = gp[0]/hp->grid[0]; |
224 |
+ |
VSUM(wp, hp->orig, hp->xv[0], d); |
225 |
+ |
|
226 |
+ |
d = gp[1]/hp->grid[1]; |
227 |
+ |
VSUM(wp, wp, hp->xv[1], d); |
228 |
+ |
|
229 |
+ |
d = gp[2]/hp->grid[2]; |
230 |
+ |
VSUM(wp, wp, hp->xv[2], d); |
231 |
+ |
} |
232 |
+ |
|
233 |
+ |
|
234 |
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double |
235 |
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hdray(ro, rd, hp, gc, r) /* compute ray within a beam */ |
236 |
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FVECT ro, rd; /* returned */ |
237 |
< |
register HOLO *hp; |
238 |
< |
register GCOORD gc[2]; |
237 |
> |
HOLO *hp; |
238 |
> |
GCOORD gc[2]; |
239 |
|
BYTE r[2][2]; |
240 |
|
{ |
241 |
< |
FVECT p[2]; |
242 |
< |
register int i; |
243 |
< |
register FLOAT *v; |
255 |
< |
double d; |
241 |
> |
FVECT cp[4], p[2]; |
242 |
> |
register int i, j; |
243 |
> |
double d0, d1; |
244 |
|
/* compute entry and exit points */ |
245 |
|
for (i = 0; i < 2; i++) { |
246 |
< |
VCOPY(p[i], hp->orig); |
247 |
< |
if (gc[i].w & 1) { |
248 |
< |
v = hp->xv[gc[i].w>>1]; |
249 |
< |
p[i][0] += *v++; p[i][1] += *v++; p[i][2] += *v; |
250 |
< |
} |
251 |
< |
d = ( gc[i].i[0] + (1./256.)*(r[i][0]+.5) ) / |
264 |
< |
hp->grid[wg0[gc[i].w]]; |
265 |
< |
v = hp->xv[wg0[gc[i].w]]; |
266 |
< |
p[i][0] += d * *v++; p[i][1] += d * *v++; p[i][2] += d * *v; |
267 |
< |
d = ( gc[i].i[1] + (1./256.)*(r[i][1]+.5) ) / |
268 |
< |
hp->grid[wg1[gc[i].w]]; |
269 |
< |
v = hp->xv[wg1[gc[i].w]]; |
270 |
< |
p[i][0] += d * *v++; p[i][1] += d * *v++; p[i][2] += d * *v; |
246 |
> |
hdcell(cp, hp, gc+i); |
247 |
> |
d0 = (1./256.)*(r[i][0]+.5); |
248 |
> |
d1 = (1./256.)*(r[i][1]+.5); |
249 |
> |
for (j = 0; j < 3; j++) |
250 |
> |
p[i][j] = (1.-d0-d1)*cp[0][j] + |
251 |
> |
d0*cp[1][j] + d1*cp[2][j]; |
252 |
|
} |
253 |
|
VCOPY(ro, p[0]); /* assign ray origin and direction */ |
254 |
< |
rd[0] = p[1][0] - p[0][0]; |
274 |
< |
rd[1] = p[1][1] - p[0][1]; |
275 |
< |
rd[2] = p[1][2] - p[0][2]; |
254 |
> |
VSUB(rd, p[1], p[0]); |
255 |
|
return(normalize(rd)); /* return maximum inside distance */ |
256 |
|
} |
257 |
|
|
258 |
|
|
259 |
|
double |
260 |
< |
hdinter(gc, r, hp, ro, rd) /* compute ray intersection with section */ |
260 |
> |
hdinter(gc, r, ed, hp, ro, rd) /* compute ray intersection with section */ |
261 |
|
register GCOORD gc[2]; /* returned */ |
262 |
< |
BYTE r[2][2]; /* returned */ |
262 |
> |
BYTE r[2][2]; /* returned (optional) */ |
263 |
> |
double *ed; /* returned (optional) */ |
264 |
|
register HOLO *hp; |
265 |
< |
FVECT ro, rd; /* rd should be normalized */ |
265 |
> |
FVECT ro, rd; /* normalization of rd affects distances */ |
266 |
|
{ |
267 |
|
FVECT p[2], vt; |
268 |
|
double d, t0, t1, d0, d1; |
271 |
|
/* first, intersect walls */ |
272 |
|
gc[0].w = gc[1].w = -1; |
273 |
|
t0 = -FHUGE; t1 = FHUGE; |
274 |
+ |
VSUB(vt, ro, hp->orig); |
275 |
|
for (i = 0; i < 3; i++) { /* for each wall pair */ |
276 |
< |
d = -DOT(rd, hp->wn[i]); /* plane distance */ |
276 |
> |
d = -DOT(rd, hp->wg[i]); /* plane distance */ |
277 |
|
if (d <= FTINY && d >= -FTINY) /* check for parallel */ |
278 |
|
continue; |
279 |
< |
d1 = DOT(ro, hp->wn[i]); /* ray distances */ |
280 |
< |
d0 = (d1 - hp->wo[i<<1]) / d; |
281 |
< |
d1 = (d1 - hp->wo[i<<1|1]) / d; |
282 |
< |
if (d0 < d1) { /* check against best */ |
279 |
> |
d1 = DOT(vt, hp->wg[i]); /* ray distances */ |
280 |
> |
d0 = d1 / d; |
281 |
> |
d1 = (d1 - hp->grid[i]) / d; |
282 |
> |
if (d < 0) { /* check against best */ |
283 |
|
if (d0 > t0) { |
284 |
|
t0 = d0; |
285 |
|
gc[0].w = i<<1; |
302 |
|
if (gc[0].w < 0 | gc[1].w < 0) /* paranoid check */ |
303 |
|
return(FHUGE); |
304 |
|
/* compute intersections */ |
305 |
< |
for (i = 0; i < 3; i++) { |
306 |
< |
p[0][i] = ro[i] + rd[i]*t0; |
326 |
< |
p[1][i] = ro[i] + rd[i]*t1; |
327 |
< |
} |
305 |
> |
VSUM(p[0], ro, rd, t0); |
306 |
> |
VSUM(p[1], ro, rd, t1); |
307 |
|
/* now, compute grid coordinates */ |
308 |
|
for (i = 0; i < 2; i++) { |
309 |
< |
vt[0] = p[i][0] - hp->orig[0]; |
310 |
< |
vt[1] = p[i][1] - hp->orig[1]; |
332 |
< |
vt[2] = p[i][2] - hp->orig[2]; |
333 |
< |
if (gc[i].w & 1) { |
334 |
< |
v = hp->xv[gc[i].w>>1]; |
335 |
< |
vt[0] -= *v++; vt[1] -= *v++; vt[2] -= *v; |
336 |
< |
} |
337 |
< |
v = hp->gv[gc[i].w>>1][0]; |
309 |
> |
VSUB(vt, p[i], hp->orig); |
310 |
> |
v = hp->wg[hdwg0[gc[i].w]]; |
311 |
|
d = DOT(vt, v); |
312 |
< |
if (d < 0. || (gc[i].i[0] = d) >= hp->grid[wg0[gc[i].w]]) |
312 |
> |
if (d < 0 || d >= hp->grid[hdwg0[gc[i].w]]) |
313 |
|
return(FHUGE); /* outside wall */ |
314 |
< |
r[i][0] = 256. * (d - gc[i].i[0]); |
315 |
< |
v = hp->gv[gc[i].w>>1][1]; |
314 |
> |
gc[i].i[0] = d; |
315 |
> |
if (r != NULL) |
316 |
> |
r[i][0] = 256. * (d - gc[i].i[0]); |
317 |
> |
v = hp->wg[hdwg1[gc[i].w]]; |
318 |
|
d = DOT(vt, v); |
319 |
< |
if (d < 0. || (gc[i].i[1] = d) >= hp->grid[wg1[gc[i].w]]) |
319 |
> |
if (d < 0 || d >= hp->grid[hdwg1[gc[i].w]]) |
320 |
|
return(FHUGE); /* outside wall */ |
321 |
< |
r[i][1] = 256. * (d - gc[i].i[1]); |
321 |
> |
gc[i].i[1] = d; |
322 |
> |
if (r != NULL) |
323 |
> |
r[i][1] = 256. * (d - gc[i].i[1]); |
324 |
|
} |
325 |
< |
/* return distance from entry point */ |
326 |
< |
vt[0] = ro[0] - p[0][0]; |
327 |
< |
vt[1] = ro[1] - p[0][1]; |
351 |
< |
vt[2] = ro[2] - p[0][2]; |
352 |
< |
return(DOT(vt,rd)); |
325 |
> |
if (ed != NULL) /* assign distance to exit point */ |
326 |
> |
*ed = t1; |
327 |
> |
return(t0); /* return distance to entry point */ |
328 |
|
} |