/
mesh_gen.c
715 lines (576 loc) · 17.8 KB
/
mesh_gen.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
/*
* Copyright 2011 Vincent Sanders <vince@kyllikki.org>
*
* Licenced under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
*
* This file is part of png23d.
*
* Routines to handle mesh generation
*/
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include "option.h"
#include "bitmap.h"
#include "mesh.h"
#include "mesh_gen.h"
#include "mesh_math.h"
enum faces {
FACE_LEFT = 1,
FACE_RIGHT = 2,
FACE_TOP = 4,
FACE_BOT = 8,
FACE_FRONT = 16,
FACE_BACK = 32,
};
/** calculate which faces of a cube are adjacent solid cubes
*/
static uint32_t
mesh_gen_get_face(bitmap *bm,
unsigned int x,
unsigned int y,
unsigned int z,
struct options *options)
{
uint32_t faces = 0;
unsigned int transparent = options->transparent;
unsigned int pxl_lvl;
uint8_t pxl_val;
#define Z_LVL_VAL(val) ((val) * (256 / options->levels))
/* value at which pixel is transparent */
pxl_lvl = Z_LVL_VAL(z);
/* pixel value at sample point */
pxl_val = bm->data[(y * bm->width) + x];
if ((pxl_val == transparent) ||
(pxl_val < pxl_lvl)) {
/* only opaque squares can have faces */
return faces;
}
/* start with all faces set */
faces = FACE_TOP | FACE_BOT |
FACE_BACK | FACE_FRONT |
FACE_LEFT | FACE_RIGHT;
/* z axis faces */
/* only the bottom layer has a front face */
if (z > 0) {
faces = faces & ~FACE_FRONT;
}
if ((z < (options->levels - 1)) &&
(pxl_val >= Z_LVL_VAL(z + 1))) {
faces = faces & ~FACE_BACK;
}
/* x axis faces */
if (x > 0) {
/* pixel value left of sample point */
pxl_val = bm->data[(y * bm->width) + (x - 1)];
if ((pxl_val != transparent) &&
(pxl_val >= pxl_lvl)) {
faces = faces & ~FACE_LEFT;
}
}
if (x < (bm->width - 1)) {
/* pixel value right of sample point */
pxl_val = bm->data[(y * bm->width) + (x + 1)];
if ((pxl_val != transparent) &&
(pxl_val >= pxl_lvl)) {
faces = faces & ~FACE_RIGHT;
}
}
if (y > 0) {
pxl_val = bm->data[((y - 1) * bm->width) + x ];
if ((pxl_val != transparent) &&
(pxl_val >= pxl_lvl)) {
faces = faces & ~FACE_TOP;
}
}
if (y < (bm->height - 1)) {
pxl_val = bm->data[((y + 1) * bm->width) + x ];
if ((pxl_val != transparent) &&
(pxl_val >= pxl_lvl)) {
faces = faces & ~FACE_BOT;
}
}
return faces;
}
/** add a facet to the mesh */
static bool
mesh_add_facet(struct mesh *mesh,
float vx0,float vy0, float vz0,
float vx1,float vy1, float vz1,
float vx2,float vy2, float vz2)
{
struct facet *newfacet;
bool degenerate = false;
if ((mesh->fcount + 1) > mesh->falloc) {
/* array needs extending */
mesh->f = realloc(mesh->f, (mesh->falloc + 1000) * sizeof(struct facet));
mesh->falloc += 1000;
}
newfacet = mesh->f + mesh->fcount;
newfacet->v[0].x = vx0;
newfacet->v[0].y = vy0;
newfacet->v[0].z = vz0;
newfacet->v[1].x = vx1;
newfacet->v[1].y = vy1;
newfacet->v[1].z = vz1;
newfacet->v[2].x = vx2;
newfacet->v[2].y = vy2;
newfacet->v[2].z = vz2;
degenerate = pnt_normal(&newfacet->n,
&newfacet->v[0],
&newfacet->v[1],
&newfacet->v[2]);
/* do not add degenerate facets */
if (!degenerate) {
mesh->fcount++;
}
return degenerate;
}
#define ADDF(xa,ya,za,xb,yb,zb,xc,yc,zc) mesh_add_facet(mesh, \
x + (xa * width), y + (ya * height), z + (za * depth), \
x + (xb * width), y + (yb * height), z + (zb * depth), \
x + (xc * width), y + (yc * height), z + (zc * depth))
/* generates cube facets for a location */
static void
mesh_gen_cube(struct mesh *mesh,
float x, float y, float z,
float width, float height, float depth,
uint32_t faces)
{
if (faces != 0) {
mesh->cubes++;
}
switch (faces & 0xf) {
case 0: /* empty */
break;
case FACE_LEFT:
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
break;
case FACE_RIGHT:
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case (FACE_LEFT | FACE_RIGHT) :
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case FACE_TOP:
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
break;
case (FACE_TOP | FACE_LEFT):
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
break;
case (FACE_TOP | FACE_RIGHT):
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case (FACE_TOP | FACE_LEFT | FACE_RIGHT):
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case FACE_BOT:
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
break;
case (FACE_BOT | FACE_LEFT):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
break;
case (FACE_BOT | FACE_RIGHT):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case (FACE_BOT | FACE_LEFT | FACE_RIGHT) :
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case (FACE_BOT | FACE_TOP):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
break;
case (FACE_BOT | FACE_TOP | FACE_LEFT):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
break;
case (FACE_BOT | FACE_TOP | FACE_RIGHT):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case (FACE_BOT | FACE_TOP | FACE_LEFT | FACE_RIGHT):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
}
if ((faces & FACE_FRONT) != 0) {
ADDF(0,0,0, 0,1,0, 1,0,0);
ADDF(0,1,0, 1,1,0, 1,0,0);
}
if ((faces & FACE_BACK) != 0) {
ADDF(0,0,1, 1,0,1, 0,1,1);
ADDF(0,1,1, 1,0,1, 1,1,1);
}
}
/* generates smoothed facets for a location
*
* appies marching squares (ish) to generate facets
*
* @todo make this table driven as a 64 entry switch is out of hand
*/
static void
mesh_gen_marching_squares(struct mesh *mesh,
float x, float y, float z,
float width, float height, float depth,
uint32_t faces)
{
if (faces != 0) {
mesh->cubes++;
}
switch (faces & 0xf) {
case 0: /* empty */
break;
case FACE_LEFT:
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
break;
case FACE_RIGHT:
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case (FACE_LEFT | FACE_RIGHT) :
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case FACE_TOP:
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
break;
case (FACE_TOP | FACE_LEFT):
ADDF(0,0,0, 0,0,1, 1,1,0);
ADDF(1,1,0, 0,0,1, 1,1,1);
if ((faces & FACE_FRONT) != 0) {
ADDF(0,0,0, 1,1,0, 1,0,0);
faces = faces & ~FACE_FRONT;
}
if ((faces & FACE_BACK) != 0) {
ADDF(0,0,1, 1,0,1, 1,1,1);
faces = faces & ~FACE_BACK;
}
break;
case (FACE_TOP | FACE_RIGHT):
ADDF(1,0,0, 0,1,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,0,1);
if ((faces & FACE_FRONT) != 0) {
ADDF(1,0,0, 0,0,0, 0,1,0);
faces = faces & ~FACE_FRONT;
}
if ((faces & FACE_BACK) != 0) {
ADDF(1,0,1, 0,1,1, 0,0,1);
faces = faces & ~FACE_BACK;
}
break;
case (FACE_TOP | FACE_LEFT | FACE_RIGHT):
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case FACE_BOT:
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
break;
case (FACE_BOT | FACE_LEFT):
ADDF(0,1,0, 1,0,0, 1,0,1);
ADDF(0,1,0, 1,0,1, 0,1,1);
if ((faces & FACE_FRONT) != 0) {
ADDF(1,0,0, 0,1,0, 1,1,0);
faces = faces & ~FACE_FRONT;
}
if ((faces & FACE_BACK) != 0) {
ADDF(1,0,1, 1,1,1, 0,1,1);
faces = faces & ~FACE_BACK;
}
break;
case (FACE_BOT | FACE_RIGHT):
ADDF(0,0,0, 1,1,0, 0,0,1);
ADDF(0,0,1, 1,1,0, 1,1,1);
if ((faces & FACE_FRONT) != 0) {
ADDF(0,0,0, 0,1,0, 1,1,0);
faces = faces & ~FACE_FRONT;
}
if ((faces & FACE_BACK) != 0) {
ADDF(0,0,1, 1,1,1, 0,1,1);
faces = faces & ~FACE_BACK;
}
break;
case (FACE_BOT | FACE_LEFT | FACE_RIGHT) :
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case (FACE_BOT | FACE_TOP):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
break;
case (FACE_BOT | FACE_TOP | FACE_LEFT):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
break;
case (FACE_BOT | FACE_TOP | FACE_RIGHT):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
case (FACE_BOT | FACE_TOP | FACE_LEFT | FACE_RIGHT):
ADDF(0,0,0, 1,0,0, 0,0,1);
ADDF(0,0,1, 1,0,0, 1,0,1);
ADDF(0,1,0, 0,1,1, 1,1,0);
ADDF(0,1,1, 1,1,1, 1,1,0);
ADDF(0,0,0, 0,0,1, 0,1,0);
ADDF(0,1,0, 0,0,1, 0,1,1);
ADDF(1,0,0, 1,1,0, 1,0,1);
ADDF(1,1,0, 1,1,1, 1,0,1);
break;
}
if ((faces & FACE_FRONT) != 0) {
ADDF(0,0,0, 0,1,0, 1,0,0);
ADDF(0,1,0, 1,1,0, 1,0,0);
}
if ((faces & FACE_BACK) != 0) {
ADDF(0,0,1, 1,0,1, 0,1,1);
ADDF(0,1,1, 1,0,1, 1,1,1);
}
}
typedef void (meshgenerator)(struct mesh *mesh,
float x, float y, float z,
float width, float height, float depth,
uint32_t faces);
/* generate maching squares
*
* this is a simple 2d extrusion of modified marching squares
* http://en.wikipedia.org/wiki/Marching_cubes
*
* consider each pixel in the raster image:
* - generate a bitfield indicating on which sides of the pixel faces need to
* be covered to generate a convex manifold.
* - add triangle facets to list for each face present
*
*/
static bool mesh_gen_squares(struct mesh *mesh, bitmap *bm, options *options)
{
unsigned int yloop;
unsigned int xloop;
unsigned int zloop;
uint32_t faces;
meshgenerator *meshgen;
if (options->levels == 1) {
meshgen = &mesh_gen_marching_squares;
} else {
meshgen = &mesh_gen_cube;
}
for (zloop = 0; zloop < options->levels; zloop++) {
for (yloop = 0; yloop < bm->height; yloop++) {
for (xloop = 0; xloop < bm->width; xloop++) {
faces = mesh_gen_get_face(bm, xloop, yloop, zloop, options);
meshgen(mesh, xloop, -(float)yloop, zloop, 1, 1, 1, faces);
}
}
}
return true;
}
/* generate cubic mesh
*
* consider each pixel in the raster image:
* - generate a bitfield indicating on which sides of the pixel faces need to
* be covered to generate a convex manifold.
* - add triangle facets to list for each face present
*
* @todo This could probably be better converted to a marching cubes solution
* instead http://en.wikipedia.org/wiki/Marching_cubes
*/
static bool mesh_gen_cubes(struct mesh *mesh, bitmap *bm, options *options)
{
unsigned int yloop;
unsigned int xloop;
unsigned int zloop;
uint32_t faces;
for (zloop = 0; zloop < options->levels; zloop++) {
for (yloop = 0; yloop < bm->height; yloop++) {
for (xloop = 0; xloop < bm->width; xloop++) {
faces = mesh_gen_get_face(bm, xloop, yloop, zloop, options);
mesh_gen_cube(mesh, xloop, -(float)yloop, zloop, 1, 1, 1, faces);
}
}
}
return true;
}
static inline float
surfacegen_calcp(bitmap *bm,
int x,
int y,
options *options)
{
uint8_t pxl_val;
int res;
/* range check, casts are safe because value cannot be -ve from previous
* test.
*/
if ((x < 0) || ((unsigned int)x >= bm->width) ||
(y < 0) || ((unsigned int)y >= bm->height)) {
return 0.0f;
}
pxl_val = bm->data[(y * bm->width) + x];
if (pxl_val == options->transparent) {
return 0.0f;
}
res = 1+(pxl_val + 1) / (256 / options->levels);
return res;
}
#define ADDSF(xa,ya,za,xb,yb,zb,xc,yc,zc) mesh_add_facet(mesh, \
x + (xa * width), y + (ya * height), za * points[xa][ya], \
x + (xb * width), y + (yb * height), zb * points[xb][yb], \
x + (xc * width), y + (yc * height), zc * points[xc][yc])
static void
gen_surface(struct mesh *mesh,
float x, float y,
float width, float height,
bool evenp, float points[2][2])
{
if (evenp) {
if ( (points[0][0] != 0) ||
(points[1][1] != 0) ||
(points[0][1] != 0)) {
/* top surface */
ADDSF(0,0,1, 0,1,1, 1,1,1);
/* flat bottom */
ADDSF(0,0,0, 1,1,0, 0,1,0);
}
if ( (points[0][0] != 0) ||
(points[1][0] != 0) ||
(points[1][1] != 0)) {
/* top surface */
ADDSF(0,0,1, 1,1,1, 1,0,1);
/* flat bottom */
ADDSF(0,0,0, 1,0,0, 1,1,0);
}
} else {
if ( (points[0][0] != 0) ||
(points[1][0] != 0) ||
(points[0][1] != 0)) {
/* top surface */
ADDSF(0,0,1, 0,1,1, 1,0,1);
/* flat bottom */
ADDSF(0,0,0, 1,0,0, 0,1,0);
}
if ( (points[1][0] != 0) ||
(points[1][1] != 0) ||
(points[0][1] != 0)) {
/* top surface */
ADDSF(1,0,1, 0,1,1, 1,1,1);
/* flat bottom */
ADDSF(1,0,0, 1,1,0, 0,1,0);
}
}
}
static bool mesh_gen_surface(struct mesh *mesh, bitmap *bm, options *options)
{
unsigned int yloop;
unsigned int xloop;
float points[2][2];
for (yloop = 0; yloop <= bm->height; yloop++) {
for (xloop = 0; xloop <= bm->width; xloop++) {
points[0][0] = surfacegen_calcp(bm, xloop - 1, yloop - 1, options);
points[1][0] = surfacegen_calcp(bm, xloop, yloop - 1, options);
points[0][1] = surfacegen_calcp(bm, xloop - 1, yloop, options);
points[1][1] = surfacegen_calcp(bm, xloop, yloop, options);
gen_surface(mesh,
xloop, -(float)yloop,
1, -1,
(((xloop + yloop) & 1) == 0),
points);
}
}
return true;
}
/* exported method documented in mesh_gen.h */
bool
mesh_from_bitmap(struct mesh *mesh, bitmap *bm, options *options)
{
bool res = false;
mesh->height = bm->height;
mesh->width = bm->width;
INFO("Generating mesh from bitmap of size %dx%d with %d levels\n",
bm->width, bm->height, options->levels);
switch (options->finish) {
case FINISH_SURFACE:
res = mesh_gen_surface(mesh, bm, options);
break;
case FINISH_SMOOTH:
res = mesh_gen_squares(mesh, bm, options);
break;
case FINISH_CUBE:
res = mesh_gen_cubes(mesh, bm, options);
break;
case FINISH_RECT:
fprintf(stderr, "Cannot generate mesh with Rectangular Cuboid finish\n");
break;
}
return res;
}