1 |
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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
2 |
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1 |
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#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ SGI"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
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#endif |
6 |
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|
4 |
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/* |
5 |
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* Routines for drawing samples using depth buffer checks. |
6 |
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*/ |
7 |
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8 |
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#include "standard.h" |
9 |
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13 |
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#include <sys/types.h> |
10 |
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#include <GL/glx.h> |
11 |
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#include <GL/glu.h> |
12 |
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|
17 |
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#include "random.h" |
13 |
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#include "rhd_odraw.h" |
14 |
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|
15 |
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#ifndef DEPTHEPS |
21 |
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#ifndef SFREEFRAC |
22 |
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#define SFREEFRAC 0.2 /* fraction to free at a time */ |
23 |
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#endif |
24 |
+ |
#ifndef REDRAWTHRESH |
25 |
+ |
#define REDRAWTHRESH 10240 /* number of samples for dissolve */ |
26 |
+ |
#endif |
27 |
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#ifndef MAXFAN |
28 |
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#define MAXFAN 32 /* maximum arms in a triangle fan */ |
29 |
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#endif |
47 |
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48 |
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49 |
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#define SAMP32 (32*(2*sizeof(short)+sizeof(union ODfunion)+sizeof(TMbright)+\ |
50 |
< |
6*sizeof(BYTE))+sizeof(int4)) |
50 |
> |
6*sizeof(uby8))+sizeof(int32)) |
51 |
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|
52 |
< |
int |
53 |
< |
odInit(n) /* initialize drawing routines */ |
54 |
< |
int n; |
52 |
> |
static int sampcmp(const void *s0, const void *s1); |
53 |
> |
static int odAllocBlockSamp(int vn, int hh, int vh, double prox); |
54 |
> |
static int make_arms(GLshort ar[MAXFAN][3], short cp[2], struct ODview *vp, |
55 |
> |
double sz); |
56 |
> |
static int depthchange(struct ODview *vp, int x0, int y0, int x1, int y1); |
57 |
> |
static void clip_edge(GLshort p[3], short o[2], struct ODview *vp); |
58 |
> |
static int getblock(struct ODview *vp, int h, int v); |
59 |
> |
static int blockedge(struct ODview *vp, int bi0, int bi1); |
60 |
> |
static void odDrawSamp(int vn, int id); |
61 |
> |
|
62 |
> |
|
63 |
> |
extern int |
64 |
> |
odInit( /* initialize drawing routines */ |
65 |
> |
int n |
66 |
> |
) |
67 |
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{ |
68 |
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int nbytes, i, j, k, nextsamp, count, blockdiv; |
69 |
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int res[2]; |
70 |
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|
71 |
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if (odNViews > 0) { /* deallocate view structures */ |
72 |
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for (i = odNViews; i--; ) { |
73 |
< |
free((char *)odView[i].bmap); |
74 |
< |
free((char *)odView[i].pmap); |
73 |
> |
free((void *)odView[i].bmap); |
74 |
> |
free((void *)odView[i].pmap); |
75 |
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if (odView[i].emap != NULL) |
76 |
< |
free((char *)odView[i].emap); |
76 |
> |
free((void *)odView[i].emap); |
77 |
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} |
78 |
< |
free((char *)odView); |
78 |
> |
free((void *)odView); |
79 |
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odView = NULL; |
80 |
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odNViews = 0; |
81 |
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} |
99 |
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return(0); |
100 |
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/* assign larger alignment types earlier */ |
101 |
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odS.f = (union ODfunion *)odS.base; |
102 |
< |
odS.redraw = (int4 *)(odS.f + n); |
102 |
> |
odS.redraw = (int32 *)(odS.f + n); |
103 |
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odS.ip = (short (*)[2])(odS.redraw + n/32); |
104 |
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odS.brt = (TMbright *)(odS.ip + n); |
105 |
< |
odS.chr = (BYTE (*)[3])(odS.brt + n); |
106 |
< |
odS.rgb = (BYTE (*)[3])(odS.chr + n); |
105 |
> |
odS.chr = (uby8 (*)[3])(odS.brt + n); |
106 |
> |
odS.rgb = (uby8 (*)[3])(odS.chr + n); |
107 |
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odS.nsamp = n; |
108 |
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} |
109 |
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if (!n) |
129 |
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if (odView[i].vlow < 1) odView[i].vlow = 1; |
130 |
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odView[i].emap = NULL; |
131 |
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odView[i].dmap = NULL; |
132 |
< |
odView[i].pmap = (int4 *)calloc(FL4NELS(res[0]*res[1]), |
133 |
< |
sizeof(int4)); |
132 |
> |
odView[i].pmap = (int32 *)calloc(FL4NELS(res[0]*res[1]), |
133 |
> |
sizeof(int32)); |
134 |
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if (odView[i].pmap == NULL) |
135 |
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return(0); |
136 |
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j = odView[i].hlow*odView[i].vlow; |
154 |
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odView[i].bmap[j].nused = 0; |
155 |
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} |
156 |
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odView[i].snext = nextsamp; |
157 |
+ |
odView[i].n2redraw = 0; |
158 |
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} |
159 |
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CLR4ALL(odS.redraw, odS.nsamp); /* clear redraw flags */ |
160 |
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for (i = odS.nsamp; i--; ) { /* clear values */ |
169 |
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|
170 |
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|
171 |
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int |
172 |
< |
sampcmp(s0, s1) /* sample order, descending proximity */ |
173 |
< |
int *s0, *s1; |
172 |
> |
sampcmp( /* sample order, descending proximity */ |
173 |
> |
const void *s0, |
174 |
> |
const void *s1 |
175 |
> |
) |
176 |
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{ |
177 |
< |
register double diff = odS.closeness(*s1) - odS.closeness(*s0); |
177 |
> |
register double diff = odS.closeness(*(int*)s1) - odS.closeness(*(int*)s0); |
178 |
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|
179 |
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return (diff > FTINY ? 1 : diff < -FTINY ? -1 : 0); |
180 |
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} |
181 |
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|
182 |
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|
183 |
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int |
184 |
< |
odAllocBlockSamp(vn, hh, vh, prox) /* allocate sample from block */ |
185 |
< |
int vn, hh, vh; |
186 |
< |
double prox; |
184 |
> |
odAllocBlockSamp( /* allocate sample from block */ |
185 |
> |
int vn, |
186 |
> |
int hh, |
187 |
> |
int vh, |
188 |
> |
double prox |
189 |
> |
) |
190 |
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{ |
191 |
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int si[SAMPSPERBLOCK+SAMPSPERBLOCK/4]; |
192 |
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int hl, vl; |
193 |
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VIEW *vw; |
178 |
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FVECT ro, rd; |
194 |
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int res[2]; |
195 |
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register struct ODblock *bp; |
196 |
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register int i, j; |
204 |
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if (CHK4(odView[vn].pmap, vh*odView[vn].hhi + hh)) |
205 |
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i = bp->first + bp->nsamp; |
206 |
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else |
207 |
< |
i = -1; |
207 |
> |
i = 0; |
208 |
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while (i-- > bp->first) |
209 |
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if (hh == odS.ip[i][0] && vh == odS.ip[i][1]) { /* found it! */ |
210 |
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/* search free list for it */ |
219 |
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bp->nused++; |
220 |
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goto gotit; |
221 |
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} |
222 |
< |
if (prox >= 0.999*odS.closeness(i)) |
222 |
> |
if (prox >= 0.99*odS.closeness(i)) |
223 |
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return(-1); /* previous sample is fine */ |
224 |
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goto gotit; |
225 |
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} |
211 |
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DCHECK(i>=-1, WARNING, "pixel in presence map not found in block"); |
226 |
|
if (bp->free != ENDFREE) { /* allocate from free list */ |
227 |
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i = bp->free; |
228 |
< |
if (odS.ip[i][0] >= 0 & odS.ip[i][1] >= 0) |
228 |
> |
if ((odS.ip[i][0] >= 0) & (odS.ip[i][1] >= 0)) |
229 |
|
CLR4(odView[vn].pmap, odS.ip[i][1]*odView[vn].hhi + |
230 |
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odS.ip[i][0]); |
231 |
|
bp->free = odS.nextfree(i); |
261 |
|
} |
262 |
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|
263 |
|
|
264 |
< |
odSample(c, d, p) /* add a sample value */ |
265 |
< |
COLR c; |
266 |
< |
FVECT d, p; |
264 |
> |
extern void |
265 |
> |
odSample( /* add a sample value */ |
266 |
> |
COLR c, |
267 |
> |
FVECT d, |
268 |
> |
FVECT p |
269 |
> |
) |
270 |
|
{ |
271 |
|
FVECT disp; |
272 |
|
double d0, d1, h, v, prox; |
316 |
|
if (id < 0) |
317 |
|
continue; /* not good enough */ |
318 |
|
/* convert color */ |
319 |
< |
tmCvColrs(&odS.brt[id], odS.chr[id], c, 1); |
319 |
> |
tmCvColrs(tmGlobal, &odS.brt[id], odS.chr[id], (COLR *)c, 1); |
320 |
|
if (imm_mode | needmapping) /* if immediate mode */ |
321 |
|
needmapping |= NEWRGB; /* map it later */ |
322 |
|
else /* else map it now */ |
323 |
< |
tmMapPixels(odS.rgb[id], &odS.brt[id], odS.chr[id], 1); |
323 |
> |
tmMapPixels(tmGlobal, odS.rgb[id], &odS.brt[id], |
324 |
> |
odS.chr[id], 1); |
325 |
|
SET4(odS.redraw, id); /* mark for redraw */ |
326 |
+ |
odView[i].n2redraw++; |
327 |
|
} |
328 |
|
} |
329 |
|
|
330 |
|
|
331 |
< |
odRemap(newhist) /* recompute tone mapping */ |
332 |
< |
int newhist; |
331 |
> |
extern void |
332 |
> |
odRemap( /* recompute tone mapping */ |
333 |
> |
int newhist |
334 |
> |
) |
335 |
|
{ |
336 |
|
needmapping |= NEWMAP|NEWRGB; |
337 |
|
if (newhist) |
339 |
|
} |
340 |
|
|
341 |
|
|
342 |
< |
odRedraw(vn, hmin, vmin, hmax, vmax) /* redraw view region */ |
343 |
< |
int vn, hmin, vmin, hmax, vmax; |
342 |
> |
extern void |
343 |
> |
odRedrawAll(void) /* mark all samples for redraw */ |
344 |
|
{ |
345 |
+ |
register int i; |
346 |
+ |
|
347 |
+ |
if ((needmapping&(NEWMAP|NEWRGB)) == (NEWMAP|NEWRGB)) |
348 |
+ |
return; /* will be called later, anyway */ |
349 |
+ |
for (i = odS.nsamp; i--; ) |
350 |
+ |
if (odS.ip[i][0] >= 0) |
351 |
+ |
SET4(odS.redraw, i); |
352 |
+ |
/* not right, but not important */ |
353 |
+ |
for (i = 0; i < odNViews; i++) |
354 |
+ |
odView[i].n2redraw = odView[i].snext - odView[i].sfirst; |
355 |
+ |
} |
356 |
+ |
|
357 |
+ |
|
358 |
+ |
extern void |
359 |
+ |
odRedraw( /* redraw view region */ |
360 |
+ |
int vn, |
361 |
+ |
int hmin, |
362 |
+ |
int vmin, |
363 |
+ |
int hmax, |
364 |
+ |
int vmax |
365 |
+ |
) |
366 |
+ |
{ |
367 |
|
int i, j; |
368 |
|
register struct ODblock *bp; |
369 |
|
register int k; |
370 |
|
|
371 |
< |
if (vn<0 | vn>=odNViews) |
371 |
> |
if ((vn<0) | (vn>=odNViews)) |
372 |
|
return; |
373 |
|
/* check view limits */ |
374 |
|
if (hmin < 0) hmin = 0; |
375 |
|
if (hmax >= odView[vn].hhi) hmax = odView[vn].hhi-1; |
376 |
|
if (vmin < 0) vmin = 0; |
377 |
|
if (vmax >= odView[vn].vhi) vmax = odView[vn].vhi-1; |
378 |
< |
if (hmax <= hmin | vmax <= vmin) |
378 |
> |
if ((hmax <= hmin) | (vmax <= vmin)) |
379 |
|
return; |
380 |
|
/* convert to low resolution */ |
381 |
|
hmin = hmin * odView[vn].hlow / odView[vn].hhi; |
387 |
|
for (j = vmin; j <= vmax; j++) { |
388 |
|
bp = odView[vn].bmap + j*odView[vn].hlow + i; |
389 |
|
for (k = bp->nsamp; k--; ) |
390 |
< |
if (odS.ip[bp->first+k][0] >= 0) |
390 |
> |
if (odS.ip[bp->first+k][0] >= 0) { |
391 |
|
SET4(odS.redraw, bp->first+k); |
392 |
+ |
odView[vn].n2redraw++; |
393 |
+ |
} |
394 |
|
} |
395 |
|
} |
396 |
|
|
397 |
|
|
398 |
< |
odDepthMap(vn, dm) /* assign depth map for view */ |
399 |
< |
int vn; |
400 |
< |
GLfloat *dm; |
398 |
> |
extern void |
399 |
> |
odDepthMap( /* assign depth map for view */ |
400 |
> |
int vn, |
401 |
> |
GLfloat *dm |
402 |
> |
) |
403 |
|
{ |
404 |
|
double d0, d1; |
405 |
|
int i, j, hmin, hmax, vmin, vmax; |
406 |
|
register int k, l; |
407 |
|
|
408 |
|
if (dm == NULL) { /* free edge map */ |
409 |
< |
if (vn<0 | vn>=odNViews) |
409 |
> |
if ((vn<0) | (vn>=odNViews)) |
410 |
|
return; /* too late -- they're gone! */ |
411 |
|
if (odView[vn].emap != NULL) |
412 |
< |
free((char *)odView[vn].emap); |
412 |
> |
free((void *)odView[vn].emap); |
413 |
|
odView[vn].emap = NULL; |
414 |
|
odView[vn].dmap = NULL; |
415 |
|
return; |
418 |
|
"bad view number in odDepthMap"); |
419 |
|
odView[vn].dmap = dm; /* initialize edge map */ |
420 |
|
if (odView[vn].emap == NULL) { |
421 |
< |
odView[vn].emap = (int4 *)malloc( |
422 |
< |
FL4NELS(odView[vn].hlow*odView[vn].vlow)*sizeof(int4)); |
421 |
> |
odView[vn].emap = (int32 *)malloc( |
422 |
> |
FL4NELS(odView[vn].hlow*odView[vn].vlow)*sizeof(int32)); |
423 |
|
if (odView[vn].emap == NULL) |
424 |
|
error(SYSTEM, "out of memory in odDepthMap"); |
425 |
|
} |
470 |
|
} |
471 |
|
|
472 |
|
|
473 |
< |
odUpdate(vn) /* update this view */ |
474 |
< |
int vn; |
473 |
> |
extern void |
474 |
> |
odUpdate( /* update this view */ |
475 |
> |
int vn |
476 |
> |
) |
477 |
|
{ |
478 |
< |
register int i, j; |
478 |
> |
static short primes[] = {9431,6803,4177,2659,1609,887,587,251,47,1}; |
479 |
> |
int myprime; |
480 |
> |
register int i, n; |
481 |
|
|
482 |
|
DCHECK(vn<0 | vn>=odNViews, CONSISTENCY, |
483 |
|
"bad view number in odUpdate"); |
485 |
|
if (needmapping & NEWRGB) { |
486 |
|
if (needmapping & NEWMAP) { |
487 |
|
if (needmapping & NEWHIST) |
488 |
< |
tmClearHisto(); |
489 |
< |
if (tmAddHisto(odS.brt,odS.nsamp,1) != TM_E_OK) |
488 |
> |
tmClearHisto(tmGlobal); |
489 |
> |
needmapping &= ~NEWHIST; |
490 |
> |
if (tmAddHisto(tmGlobal, odS.brt,odS.nsamp,1) != TM_E_OK) |
491 |
|
return; |
492 |
< |
if (tmComputeMapping(0.,0.,0.) != TM_E_OK) |
492 |
> |
if (tmComputeMapping(tmGlobal, 0.,0.,0.) != TM_E_OK) |
493 |
|
return; |
494 |
< |
for (i = odS.nsamp; i--; ) /* redraw all */ |
495 |
< |
if (odS.ip[i][0] >= 0) |
444 |
< |
SET4(odS.redraw, i); |
494 |
> |
needmapping &= ~NEWMAP; |
495 |
> |
odRedrawAll(); /* redraw everything */ |
496 |
|
} |
497 |
< |
if (tmMapPixels(odS.rgb,odS.brt,odS.chr,odS.nsamp) != TM_E_OK) |
497 |
> |
if (tmMapPixels(tmGlobal, (uby8 *)(odS.rgb), odS.brt, |
498 |
> |
(uby8 *)(odS.chr), odS.nsamp) != TM_E_OK) |
499 |
|
return; |
500 |
< |
needmapping = 0; /* reset flag */ |
500 |
> |
needmapping &= ~NEWRGB; |
501 |
|
} |
502 |
< |
/* this code segment was too slow */ |
503 |
< |
#if 0 |
504 |
< |
for (i = odView[vn].sfirst; i < odView[vn].snext; i++) |
502 |
> |
if (odView[vn].n2redraw <= 0) |
503 |
> |
return; |
504 |
> |
#if REDRAWTHRESH |
505 |
> |
if (odView[vn].n2redraw < REDRAWTHRESH) |
506 |
> |
goto quickdraw; |
507 |
> |
/* pick a good prime step size */ |
508 |
> |
n = odView[vn].snext - odView[vn].sfirst; |
509 |
> |
for (i = 0; primes[i]<<5 >= n; i++) |
510 |
> |
; |
511 |
> |
while ((myprime = primes[i++]) > 1) |
512 |
> |
if (n % myprime) |
513 |
> |
break; |
514 |
> |
/* dissolve in new samples */ |
515 |
> |
for (i = odView[vn].sfirst; n-- > 0; i += myprime) { |
516 |
> |
if (i >= odView[vn].snext) |
517 |
> |
i -= odView[vn].snext - odView[vn].sfirst; |
518 |
|
if (CHK4(odS.redraw, i)) { |
519 |
|
odDrawSamp(vn, i); |
520 |
|
CLR4(odS.redraw, i); |
521 |
|
} |
522 |
+ |
} |
523 |
+ |
odView[vn].n2redraw = 0; |
524 |
+ |
return; |
525 |
+ |
quickdraw: /* quicker sparse flag checking */ |
526 |
|
#endif |
527 |
< |
/* redraw samples at each end */ |
528 |
< |
for (i = odView[vn].sfirst; i < odView[vn].sfirst+31; i++) |
527 |
> |
/* redraw samples at end */ |
528 |
> |
for (i = odView[vn].snext-31; i < odView[vn].snext; i++) |
529 |
|
if (CHK4(odS.redraw, i)) { |
530 |
|
odDrawSamp(vn, i); |
531 |
|
CLR4(odS.redraw, i); |
532 |
|
} |
533 |
< |
for (i = odView[vn].snext-31; i < odView[vn].snext; i++) |
533 |
> |
/* faster flag checks in middle */ |
534 |
> |
for (n = odView[vn].snext>>5; n-- > (odView[vn].sfirst+0x1f)>>5; ) |
535 |
> |
for (i = 0; odS.redraw[n]; i++) /* skips faster */ |
536 |
> |
if (odS.redraw[n] & 1L<<i) { |
537 |
> |
odDrawSamp(vn, (n<<5)+i); |
538 |
> |
odS.redraw[n] &= ~(1L<<i); |
539 |
> |
} |
540 |
> |
/* redraw samples at beginning */ |
541 |
> |
for (i = odView[vn].sfirst; i < odView[vn].sfirst+31; i++) |
542 |
|
if (CHK4(odS.redraw, i)) { |
543 |
|
odDrawSamp(vn, i); |
544 |
|
CLR4(odS.redraw, i); |
545 |
|
} |
546 |
< |
/* faster flag checks in middle */ |
470 |
< |
for (j = odView[vn].snext>>5; j-- > (odView[vn].sfirst+0x1f)>>5; ) |
471 |
< |
for (i = 0; odS.redraw[j]; i++) /* skips faster */ |
472 |
< |
if (odS.redraw[j] & 1L<<i) { |
473 |
< |
odDrawSamp(vn, (j<<5)+i); |
474 |
< |
odS.redraw[j] &= ~(1L<<i); |
475 |
< |
} |
546 |
> |
odView[vn].n2redraw = 0; |
547 |
|
} |
548 |
|
|
549 |
|
|
578 |
|
|
579 |
|
|
580 |
|
static int |
581 |
< |
make_arms(ar, cp, vp, sz) /* make arms for triangle fan */ |
582 |
< |
GLshort ar[MAXFAN][3]; |
583 |
< |
short cp[2]; |
584 |
< |
register struct ODview *vp; |
585 |
< |
double sz; |
581 |
> |
make_arms( /* make arms for triangle fan */ |
582 |
> |
GLshort ar[MAXFAN][3], |
583 |
> |
short cp[2], |
584 |
> |
register struct ODview *vp, |
585 |
> |
double sz |
586 |
> |
) |
587 |
|
{ |
588 |
|
int na, dv; |
589 |
< |
double hrad, vrad, phi0, phi; |
589 |
> |
double hrad, vrad, phi; |
590 |
|
register int i; |
591 |
|
|
592 |
|
DCHECK(sz > 1, CONSISTENCY, "super-unary size in make_arms"); |
593 |
< |
na = MAXFAN*sz*sz + 0.5; /* keep area constant */ |
593 |
> |
na = MAXFAN*sz + 0.5; /* keep arc length constant */ |
594 |
|
if (na < MINFAN) na = MINFAN; |
595 |
|
hrad = FANSIZE*sz*vp->hhi/vp->hlow; |
596 |
|
vrad = FANSIZE*sz*vp->vhi/vp->vlow; |
597 |
|
if (hrad*vrad < 2.25) |
598 |
|
hrad = vrad = 1.5; |
527 |
– |
phi0 = (2.*PI) * frandom(); |
599 |
|
dv = OMAXDEPTH*sz + 0.5; |
600 |
|
for (i = 0; i < na; i++) { |
601 |
< |
phi = phi0 + (2.*PI)*i/na; |
601 |
> |
phi = (2.*PI)*i/na; |
602 |
|
ar[i][0] = cp[0] + tcos(phi)*hrad + 0.5; |
603 |
|
ar[i][1] = cp[1] + tsin(phi)*vrad + 0.5; |
604 |
|
ar[i][2] = dv; |
609 |
|
|
610 |
|
|
611 |
|
static int |
612 |
< |
depthchange(vp, x0, y0, x1, y1) /* check depth discontinuity */ |
613 |
< |
register struct ODview *vp; |
614 |
< |
int x0, y0, x1, y1; |
612 |
> |
depthchange( /* check depth discontinuity */ |
613 |
> |
register struct ODview *vp, |
614 |
> |
int x0, |
615 |
> |
int y0, |
616 |
> |
int x1, |
617 |
> |
int y1 |
618 |
> |
) |
619 |
|
{ |
620 |
|
register double d0, d1; |
621 |
|
|
622 |
|
DCHECK(x0<0 | x0>=vp->hhi | y0<0 | y0>=vp->vhi, |
623 |
|
CONSISTENCY, "coordinates off view in depthchange"); |
624 |
|
|
625 |
< |
if (x1<0 | x1>=vp->hhi | y1<0 | y1>=vp->vhi) |
625 |
> |
if ((x1<0) | (x1>=vp->hhi) | (y1<0) | (y1>=vp->vhi)) |
626 |
|
return(1); |
627 |
|
|
628 |
|
d0 = vp->dmap[y0*vp->hhi + x0]; |
632 |
|
} |
633 |
|
|
634 |
|
|
635 |
< |
static |
636 |
< |
clip_edge(p, o, vp) /* clip line segment to depth edge */ |
637 |
< |
GLshort p[3]; |
638 |
< |
short o[2]; |
639 |
< |
register struct ODview *vp; |
635 |
> |
static void |
636 |
> |
clip_edge( /* clip line segment to depth edge */ |
637 |
> |
GLshort p[3], |
638 |
> |
short o[2], |
639 |
> |
register struct ODview *vp |
640 |
> |
) |
641 |
|
{ |
642 |
|
int x, y, xstep, ystep, rise, rise2, run, run2, n; |
643 |
|
|
656 |
|
n = rise + run; |
657 |
|
while (n--) /* run out arm, checking depth */ |
658 |
|
if (run2 > rise2) { |
583 |
– |
if (depthchange(vp, x, y, x+xstep, y)) |
584 |
– |
break; |
659 |
|
x += xstep; |
660 |
|
rise2 += rise; |
661 |
< |
} else { |
588 |
< |
if (depthchange(vp, x, y, x, y+ystep)) |
661 |
> |
if (depthchange(vp, x-xstep, y, x, y)) |
662 |
|
break; |
663 |
+ |
} else { |
664 |
|
y += ystep; |
665 |
|
run2 += run; |
666 |
+ |
if (depthchange(vp, x, y-ystep, x, y)) |
667 |
+ |
break; |
668 |
|
} |
669 |
|
if (n < 0) /* found something? */ |
670 |
|
return; |
678 |
|
|
679 |
|
|
680 |
|
static int |
681 |
< |
getblock(vp, h, v) /* get block index */ |
682 |
< |
register struct ODview *vp; |
683 |
< |
register int h, v; |
681 |
> |
getblock( /* get block index */ |
682 |
> |
register struct ODview *vp, |
683 |
> |
register int h, |
684 |
> |
register int v |
685 |
> |
) |
686 |
|
{ |
687 |
< |
if (h<0 | h>=vp->hhi | v<0 | v>=vp->vhi) |
687 |
> |
if ((h<0) | (h>=vp->hhi) | (v<0) | (v>=vp->vhi)) |
688 |
|
return(-1); |
689 |
|
return(h*vp->hlow/vp->hhi + v*vp->vlow/vp->vhi*vp->hlow); |
690 |
|
} |
691 |
|
|
692 |
|
|
693 |
< |
odDrawSamp(vn, id) /* draw view sample */ |
694 |
< |
int vn; |
695 |
< |
register int id; |
693 |
> |
static int |
694 |
> |
blockedge( /* check for edge between blocks? */ |
695 |
> |
register struct ODview *vp, |
696 |
> |
register int bi0, |
697 |
> |
register int bi1 |
698 |
> |
) |
699 |
|
{ |
700 |
+ |
if (bi1 == bi0) |
701 |
+ |
return(0); /* same block */ |
702 |
+ |
if (bi1 < 0) |
703 |
+ |
return(1); /* end off view */ |
704 |
+ |
if (CHK4(vp->emap, bi1)) |
705 |
+ |
return(1); /* end block has edges */ |
706 |
+ |
if (bi1 == bi0+1 || bi1 == bi0-1 || |
707 |
+ |
bi1 == bi0+vp->hlow || bi1 == bi0-vp->hlow) |
708 |
+ |
return(0); /* end in adjacent block -- no edges */ |
709 |
+ |
return(1); /* conservative for rarer case */ |
710 |
+ |
} |
711 |
+ |
|
712 |
+ |
|
713 |
+ |
static void |
714 |
+ |
odDrawSamp( /* draw view sample */ |
715 |
+ |
int vn, |
716 |
+ |
register int id |
717 |
+ |
) |
718 |
+ |
{ |
719 |
|
GLshort arm[MAXFAN][3]; |
720 |
< |
int narms, blockindex, bi1; |
720 |
> |
int narms, blockindex; |
721 |
|
register struct ODview *vp; |
722 |
|
double size; |
723 |
|
int home_edges; |
734 |
|
if (vp->emap != NULL) { /* check for edge collisions */ |
735 |
|
home_edges = CHK4(vp->emap, blockindex); |
736 |
|
for (i = 0; i < narms; i++) |
737 |
< |
/* the following test is flawed, because we could |
738 |
< |
* be passing through a block on a diagonal run */ |
639 |
< |
if (home_edges || |
640 |
< |
( (bi1 = getblock(vp, arm[i][0], arm[i][1])) |
641 |
< |
!= blockindex && |
642 |
< |
(bi1 < 0 || CHK4(vp->emap, bi1)) )) |
737 |
> |
if (home_edges || blockedge(vp, blockindex, |
738 |
> |
getblock(vp, arm[i][0], arm[i][1]))) |
739 |
|
clip_edge(arm[i], odS.ip[id], vp); |
740 |
|
} |
741 |
|
/* draw triangle fan */ |