This repository has been archived by the owner on Nov 22, 2023. It is now read-only.
forked from nothings/stb
-
Notifications
You must be signed in to change notification settings - Fork 0
/
stb_herringbone_wang_tile.h
1221 lines (1054 loc) · 42.2 KB
/
stb_herringbone_wang_tile.h
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
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* stbhw - v0.7 - http://nothings.org/gamedev/herringbone
Herringbone Wang Tile Generator - Sean Barrett 2014 - public domain
== LICENSE ==============================
This software is dual-licensed to the public domain and under the following
license: you are granted a perpetual, irrevocable license to copy, modify,
publish, and distribute this file as you see fit.
== WHAT IT IS ===========================
This library is an SDK for Herringbone Wang Tile generation:
http://nothings.org/gamedev/herringbone
The core design is that you use this library offline to generate a
"template" of the tiles you'll create. You then edit those tiles, then
load the created tile image file back into this library and use it at
runtime to generate "maps".
You cannot load arbitrary tile image files with this library; it is
only designed to load image files made from the template it created.
It stores a binary description of the tile sizes & constraints in a
few pixels, and uses those to recover the rules, rather than trying
to parse the tiles themselves.
You *can* use this library to generate from arbitrary tile sets, but
only by loading the tile set and specifying the constraints explicitly
yourself.
== COMPILING ============================
1. #define STB_HERRINGBONE_WANG_TILE_IMPLEMENTATION before including this
header file in *one* source file to create the implementation
in that source file.
2. optionally #define STB_HBWANG_RAND() to be a random number
generator. if you don't define it, it will use rand(),
and you need to seed srand() yourself.
3. optionally #define STB_HBWANG_ASSERT(x), otherwise
it will use assert()
4. optionally #define STB_HBWANG_STATIC to force all symbols to be
static instead of public, so they are only accesible
in the source file that creates the implementation
5. optionally #define STB_HBWANG_NO_REPITITION_REDUCTION to disable
the code that tries to reduce having the same tile appear
adjacent to itself in wang-corner-tile mode (e.g. imagine
if you were doing something where 90% of things should be
the same grass tile, you need to disable this system)
6. optionally define STB_HBWANG_MAX_X and STB_HBWANG_MAX_Y
to be the max dimensions of the generated map in multiples
of the wang tile's short side's length (e.g. if you
have 20x10 wang tiles, so short_side_len=10, and you
have MAX_X is 17, then the largest map you can generate
is 170 pixels wide). The defaults are 100x100. This
is used to define static arrays which affect memory
usage.
== USING ================================
To use the map generator, you need a tileset. You can download
some sample tilesets from http://nothings.org/gamedev/herringbone
Then see the "sample application" below.
You can also use this file to generate templates for
tilesets which you then hand-edit to create the data.
== MEMORY MANAGEMENT ====================
The tileset loader allocates memory with malloc(). The map
generator does no memory allocation, so e.g. you can load
tilesets at startup and never free them and never do any
further allocation.
== SAMPLE APPLICATION ===================
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h" // http://nothings.org/stb_image.c
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h" // http://nothings.org/stb/stb_image_write.h
#define STB_HBWANG_IMPLEMENTATION
#include "stb_hbwang.h"
int main(int argc, char **argv)
{
unsigned char *data;
int xs,ys, w,h;
stbhw_tileset ts;
if (argc != 4) {
fprintf(stderr, "Usage: mapgen {tile-file} {xsize} {ysize}\n"
"generates file named 'test_map.png'\n");
exit(1);
}
data = stbi_load(argv[1], &w, &h, NULL, 3);
xs = atoi(argv[2]);
ys = atoi(argv[3]);
if (data == NULL) {
fprintf(stderr, "Error opening or parsing '%s' as an image file\n", argv[1]);
exit(1);
}
if (xs < 1 || xs > 1000) {
fprintf(stderr, "xsize invalid or out of range\n");
exit(1);
}
if (ys < 1 || ys > 1000) {
fprintf(stderr, "ysize invalid or out of range\n");
exit(1);
}
stbhw_build_tileset_from_image(&ts, data, w*3, w, h);
free(data);
// allocate a buffer to create the final image to
data = malloc(3 * xs * ys);
srand(time(NULL));
stbhw_generate_image(&ts, NULL, data, xs*3, xs, ys);
stbi_write_png("test_map.png", xs, ys, 3, data, xs*3);
stbhw_free_tileset(&ts);
free(data);
return 0;
}
== VERSION HISTORY ===================
0.7 2019-03-04 - fix warnings
0.6 2014-08-17 - fix broken map-maker
0.5 2014-07-07 - initial release
*/
//////////////////////////////////////////////////////////////////////////////
// //
// HEADER FILE SECTION //
// //
#ifndef INCLUDE_STB_HWANG_H
#define INCLUDE_STB_HWANG_H
#ifdef STB_HBWANG_STATIC
#define STBHW_EXTERN static
#else
#ifdef __cplusplus
#define STBHW_EXTERN extern "C"
#else
#define STBHW_EXTERN extern
#endif
#endif
typedef struct stbhw_tileset stbhw_tileset;
// returns description of last error produced by any function (not thread-safe)
STBHW_EXTERN const char *stbhw_get_last_error(void);
// build a tileset from an image that conforms to a template created by this
// library. (you allocate storage for stbhw_tileset and function fills it out;
// memory for individual tiles are malloc()ed).
// returns non-zero on success, 0 on error
STBHW_EXTERN int stbhw_build_tileset_from_image(stbhw_tileset *ts,
unsigned char *pixels, int stride_in_bytes, int w, int h);
// free a tileset built by stbhw_build_tileset_from_image
STBHW_EXTERN void stbhw_free_tileset(stbhw_tileset *ts);
// generate a map that is w * h pixels (3-bytes each)
// returns non-zero on success, 0 on error
// not thread-safe (uses a global data structure to avoid memory management)
// weighting should be NULL, as non-NULL weighting is currently untested
STBHW_EXTERN int stbhw_generate_image(stbhw_tileset *ts, int **weighting,
unsigned char *pixels, int stride_in_bytes, int w, int h);
//////////////////////////////////////
//
// TILESET DATA STRUCTURE
//
// if you use the image-to-tileset system from this file, you
// don't need to worry about these data structures. but if you
// want to build/load a tileset yourself, you'll need to fill
// these out.
typedef struct
{
// the edge or vertex constraints, according to diagram below
signed char a,b,c,d,e,f;
// The herringbone wang tile data; it is a bitmap which is either
// w=2*short_sidelen,h=short_sidelen, or w=short_sidelen,h=2*short_sidelen.
// it is always RGB, stored row-major, with no padding between rows.
// (allocate stbhw_tile structure to be large enough for the pixel data)
unsigned char pixels[1];
} stbhw_tile;
struct stbhw_tileset
{
int is_corner;
int num_color[6]; // number of colors for each of 6 edge types or 4 corner types
int short_side_len;
stbhw_tile **h_tiles;
stbhw_tile **v_tiles;
int num_h_tiles, max_h_tiles;
int num_v_tiles, max_v_tiles;
};
/////////////// TEMPLATE GENERATOR //////////////////////////
// when requesting a template, you fill out this data
typedef struct
{
int is_corner; // using corner colors or edge colors?
int short_side_len; // rectangles is 2n x n, n = short_side_len
int num_color[6]; // see below diagram for meaning of the index to this;
// 6 values if edge (!is_corner), 4 values if is_corner
// legal numbers: 1..8 if edge, 1..4 if is_corner
int num_vary_x; // additional number of variations along x axis in the template
int num_vary_y; // additional number of variations along y axis in the template
int corner_type_color_template[4][4];
// if corner_type_color_template[s][t] is non-zero, then any
// corner of type s generated as color t will get a little
// corner sample markup in the template image data
} stbhw_config;
// computes the size needed for the template image
STBHW_EXTERN void stbhw_get_template_size(stbhw_config *c, int *w, int *h);
// generates a template image, assuming data is 3*w*h bytes long, RGB format
STBHW_EXTERN int stbhw_make_template(stbhw_config *c, unsigned char *data, int w, int h, int stride_in_bytes);
#endif//INCLUDE_STB_HWANG_H
// TILE CONSTRAINT TYPES
//
// there are 4 "types" of corners and 6 types of edges.
// you can configure the tileset to have different numbers
// of colors for each type of color or edge.
//
// corner types:
//
// 0---*---1---*---2---*---3
// | | |
// * * *
// | | |
// 1---*---2---*---3 0---*---1---*---2
// | | |
// * * *
// | | |
// 0---*---1---*---2---*---3
//
//
// edge types:
//
// *---2---*---3---* *---0---*
// | | | |
// 1 4 5 1
// | | | |
// *---0---*---2---* * *
// | |
// 4 5
// | |
// *---3---*
//
// TILE CONSTRAINTS
//
// each corner/edge has a color; this shows the name
// of the variable containing the color
//
// corner constraints:
//
// a---*---d
// | |
// * *
// | |
// a---*---b---*---c b e
// | | | |
// * * * *
// | | | |
// d---*---e---*---f c---*---f
//
//
// edge constraints:
//
// *---a---*---b---* *---a---*
// | | | |
// c d b c
// | | | |
// *---e---*---f---* * *
// | |
// d e
// | |
// *---f---*
//
//////////////////////////////////////////////////////////////////////////////
// //
// IMPLEMENTATION SECTION //
// //
#ifdef STB_HERRINGBONE_WANG_TILE_IMPLEMENTATION
#include <string.h> // memcpy
#include <stdlib.h> // malloc
#ifndef STB_HBWANG_RAND
#include <stdlib.h>
#define STB_HBWANG_RAND() (rand() >> 4)
#endif
#ifndef STB_HBWANG_ASSERT
#include <assert.h>
#define STB_HBWANG_ASSERT(x) assert(x)
#endif
// map size
#ifndef STB_HBWANG_MAX_X
#define STB_HBWANG_MAX_X 100
#endif
#ifndef STB_HBWANG_MAX_Y
#define STB_HBWANG_MAX_Y 100
#endif
// global variables for color assignments
// @MEMORY change these to just store last two/three rows
// and keep them on the stack
static signed char c_color[STB_HBWANG_MAX_Y+6][STB_HBWANG_MAX_X+6];
static signed char v_color[STB_HBWANG_MAX_Y+6][STB_HBWANG_MAX_X+5];
static signed char h_color[STB_HBWANG_MAX_Y+5][STB_HBWANG_MAX_X+6];
static const char *stbhw_error;
STBHW_EXTERN const char *stbhw_get_last_error(void)
{
const char *temp = stbhw_error;
stbhw_error = 0;
return temp;
}
/////////////////////////////////////////////////////////////
//
// SHARED TEMPLATE-DESCRIPTION CODE
//
// Used by both template generator and tileset parser; by
// using the same code, they are locked in sync and we don't
// need to try to do more sophisticated parsing of edge color
// markup or something.
typedef void stbhw__process_rect(struct stbhw__process *p, int xpos, int ypos,
int a, int b, int c, int d, int e, int f);
typedef struct stbhw__process
{
stbhw_tileset *ts;
stbhw_config *c;
stbhw__process_rect *process_h_rect;
stbhw__process_rect *process_v_rect;
unsigned char *data;
int stride,w,h;
} stbhw__process;
static void stbhw__process_h_row(stbhw__process *p,
int xpos, int ypos,
int a0, int a1,
int b0, int b1,
int c0, int c1,
int d0, int d1,
int e0, int e1,
int f0, int f1,
int variants)
{
int a,b,c,d,e,f,v;
for (v=0; v < variants; ++v)
for (f=f0; f <= f1; ++f)
for (e=e0; e <= e1; ++e)
for (d=d0; d <= d1; ++d)
for (c=c0; c <= c1; ++c)
for (b=b0; b <= b1; ++b)
for (a=a0; a <= a1; ++a) {
p->process_h_rect(p, xpos, ypos, a,b,c,d,e,f);
xpos += 2*p->c->short_side_len + 3;
}
}
static void stbhw__process_v_row(stbhw__process *p,
int xpos, int ypos,
int a0, int a1,
int b0, int b1,
int c0, int c1,
int d0, int d1,
int e0, int e1,
int f0, int f1,
int variants)
{
int a,b,c,d,e,f,v;
for (v=0; v < variants; ++v)
for (f=f0; f <= f1; ++f)
for (e=e0; e <= e1; ++e)
for (d=d0; d <= d1; ++d)
for (c=c0; c <= c1; ++c)
for (b=b0; b <= b1; ++b)
for (a=a0; a <= a1; ++a) {
p->process_v_rect(p, xpos, ypos, a,b,c,d,e,f);
xpos += p->c->short_side_len+3;
}
}
static void stbhw__get_template_info(stbhw_config *c, int *w, int *h, int *h_count, int *v_count)
{
int size_x,size_y;
int horz_count,vert_count;
if (c->is_corner) {
int horz_w = c->num_color[1] * c->num_color[2] * c->num_color[3] * c->num_vary_x;
int horz_h = c->num_color[0] * c->num_color[1] * c->num_color[2] * c->num_vary_y;
int vert_w = c->num_color[0] * c->num_color[3] * c->num_color[2] * c->num_vary_y;
int vert_h = c->num_color[1] * c->num_color[0] * c->num_color[3] * c->num_vary_x;
int horz_x = horz_w * (2*c->short_side_len + 3);
int horz_y = horz_h * ( c->short_side_len + 3);
int vert_x = vert_w * ( c->short_side_len + 3);
int vert_y = vert_h * (2*c->short_side_len + 3);
horz_count = horz_w * horz_h;
vert_count = vert_w * vert_h;
size_x = horz_x > vert_x ? horz_x : vert_x;
size_y = 2 + horz_y + 2 + vert_y;
} else {
int horz_w = c->num_color[0] * c->num_color[1] * c->num_color[2] * c->num_vary_x;
int horz_h = c->num_color[3] * c->num_color[4] * c->num_color[2] * c->num_vary_y;
int vert_w = c->num_color[0] * c->num_color[5] * c->num_color[1] * c->num_vary_y;
int vert_h = c->num_color[3] * c->num_color[4] * c->num_color[5] * c->num_vary_x;
int horz_x = horz_w * (2*c->short_side_len + 3);
int horz_y = horz_h * ( c->short_side_len + 3);
int vert_x = vert_w * ( c->short_side_len + 3);
int vert_y = vert_h * (2*c->short_side_len + 3);
horz_count = horz_w * horz_h;
vert_count = vert_w * vert_h;
size_x = horz_x > vert_x ? horz_x : vert_x;
size_y = 2 + horz_y + 2 + vert_y;
}
if (w) *w = size_x;
if (h) *h = size_y;
if (h_count) *h_count = horz_count;
if (v_count) *v_count = vert_count;
}
STBHW_EXTERN void stbhw_get_template_size(stbhw_config *c, int *w, int *h)
{
stbhw__get_template_info(c, w, h, NULL, NULL);
}
static int stbhw__process_template(stbhw__process *p)
{
int i,j,k,q, ypos;
int size_x, size_y;
stbhw_config *c = p->c;
stbhw__get_template_info(c, &size_x, &size_y, NULL, NULL);
if (p->w < size_x || p->h < size_y) {
stbhw_error = "image too small for configuration";
return 0;
}
if (c->is_corner) {
ypos = 2;
for (k=0; k < c->num_color[2]; ++k) {
for (j=0; j < c->num_color[1]; ++j) {
for (i=0; i < c->num_color[0]; ++i) {
for (q=0; q < c->num_vary_y; ++q) {
stbhw__process_h_row(p, 0,ypos,
0,c->num_color[1]-1, 0,c->num_color[2]-1, 0,c->num_color[3]-1,
i,i, j,j, k,k,
c->num_vary_x);
ypos += c->short_side_len + 3;
}
}
}
}
ypos += 2;
for (k=0; k < c->num_color[3]; ++k) {
for (j=0; j < c->num_color[0]; ++j) {
for (i=0; i < c->num_color[1]; ++i) {
for (q=0; q < c->num_vary_x; ++q) {
stbhw__process_v_row(p, 0,ypos,
0,c->num_color[0]-1, 0,c->num_color[3]-1, 0,c->num_color[2]-1,
i,i, j,j, k,k,
c->num_vary_y);
ypos += (c->short_side_len*2) + 3;
}
}
}
}
assert(ypos == size_y);
} else {
ypos = 2;
for (k=0; k < c->num_color[3]; ++k) {
for (j=0; j < c->num_color[4]; ++j) {
for (i=0; i < c->num_color[2]; ++i) {
for (q=0; q < c->num_vary_y; ++q) {
stbhw__process_h_row(p, 0,ypos,
0,c->num_color[2]-1, k,k,
0,c->num_color[1]-1, j,j,
0,c->num_color[0]-1, i,i,
c->num_vary_x);
ypos += c->short_side_len + 3;
}
}
}
}
ypos += 2;
for (k=0; k < c->num_color[3]; ++k) {
for (j=0; j < c->num_color[4]; ++j) {
for (i=0; i < c->num_color[5]; ++i) {
for (q=0; q < c->num_vary_x; ++q) {
stbhw__process_v_row(p, 0,ypos,
0,c->num_color[0]-1, i,i,
0,c->num_color[1]-1, j,j,
0,c->num_color[5]-1, k,k,
c->num_vary_y);
ypos += (c->short_side_len*2) + 3;
}
}
}
}
assert(ypos == size_y);
}
return 1;
}
/////////////////////////////////////////////////////////////
//
// MAP GENERATOR
//
static void stbhw__draw_pixel(unsigned char *output, int stride, int x, int y, unsigned char c[3])
{
memcpy(output + y*stride + x*3, c, 3);
}
static void stbhw__draw_h_tile(unsigned char *output, int stride, int xmax, int ymax, int x, int y, stbhw_tile *h, int sz)
{
int i,j;
for (j=0; j < sz; ++j)
if (y+j >= 0 && y+j < ymax)
for (i=0; i < sz*2; ++i)
if (x+i >= 0 && x+i < xmax)
stbhw__draw_pixel(output,stride, x+i,y+j, &h->pixels[(j*sz*2 + i)*3]);
}
static void stbhw__draw_v_tile(unsigned char *output, int stride, int xmax, int ymax, int x, int y, stbhw_tile *h, int sz)
{
int i,j;
for (j=0; j < sz*2; ++j)
if (y+j >= 0 && y+j < ymax)
for (i=0; i < sz; ++i)
if (x+i >= 0 && x+i < xmax)
stbhw__draw_pixel(output,stride, x+i,y+j, &h->pixels[(j*sz + i)*3]);
}
// randomly choose a tile that fits constraints for a given spot, and update the constraints
static stbhw_tile * stbhw__choose_tile(stbhw_tile **list, int numlist,
signed char *a, signed char *b, signed char *c,
signed char *d, signed char *e, signed char *f,
int **weighting)
{
int i,n,m = 1<<30,pass;
for (pass=0; pass < 2; ++pass) {
n=0;
// pass #1:
// count number of variants that match this partial set of constraints
// pass #2:
// stop on randomly selected match
for (i=0; i < numlist; ++i) {
stbhw_tile *h = list[i];
if ((*a < 0 || *a == h->a) &&
(*b < 0 || *b == h->b) &&
(*c < 0 || *c == h->c) &&
(*d < 0 || *d == h->d) &&
(*e < 0 || *e == h->e) &&
(*f < 0 || *f == h->f)) {
if (weighting)
n += weighting[0][i];
else
n += 1;
if (n > m) {
// use list[i]
// update constraints to reflect what we placed
*a = h->a;
*b = h->b;
*c = h->c;
*d = h->d;
*e = h->e;
*f = h->f;
return h;
}
}
}
if (n == 0) {
stbhw_error = "couldn't find tile matching constraints";
return NULL;
}
m = STB_HBWANG_RAND() % n;
}
STB_HBWANG_ASSERT(0);
return NULL;
}
static int stbhw__match(int x, int y)
{
return c_color[y][x] == c_color[y+1][x+1];
}
static int stbhw__weighted(int num_options, int *weights)
{
int k, total, choice;
total = 0;
for (k=0; k < num_options; ++k)
total += weights[k];
choice = STB_HBWANG_RAND() % total;
total = 0;
for (k=0; k < num_options; ++k) {
total += weights[k];
if (choice < total)
break;
}
STB_HBWANG_ASSERT(k < num_options);
return k;
}
static int stbhw__change_color(int old_color, int num_options, int *weights)
{
if (weights) {
int k, total, choice;
total = 0;
for (k=0; k < num_options; ++k)
if (k != old_color)
total += weights[k];
choice = STB_HBWANG_RAND() % total;
total = 0;
for (k=0; k < num_options; ++k) {
if (k != old_color) {
total += weights[k];
if (choice < total)
break;
}
}
STB_HBWANG_ASSERT(k < num_options);
return k;
} else {
int offset = 1+STB_HBWANG_RAND() % (num_options-1);
return (old_color+offset) % num_options;
}
}
// generate a map that is w * h pixels (3-bytes each)
// returns 1 on success, 0 on error
STBHW_EXTERN int stbhw_generate_image(stbhw_tileset *ts, int **weighting, unsigned char *output, int stride, int w, int h)
{
int sidelen = ts->short_side_len;
int xmax = (w / sidelen) + 6;
int ymax = (h / sidelen) + 6;
if (xmax > STB_HBWANG_MAX_X+6 || ymax > STB_HBWANG_MAX_Y+6) {
stbhw_error = "increase STB_HBWANG_MAX_X/Y";
return 0;
}
if (ts->is_corner) {
int i,j, ypos;
int *cc = ts->num_color;
for (j=0; j < ymax; ++j) {
for (i=0; i < xmax; ++i) {
int p = (i-j+1)&3; // corner type
if (weighting==NULL || weighting[p]==0 || cc[p] == 1)
c_color[j][i] = STB_HBWANG_RAND() % cc[p];
else
c_color[j][i] = stbhw__weighted(cc[p], weighting[p]);
}
}
#ifndef STB_HBWANG_NO_REPITITION_REDUCTION
// now go back through and make sure we don't have adjancent 3x2 vertices that are identical,
// to avoid really obvious repetition (which happens easily with extreme weights)
for (j=0; j < ymax-3; ++j) {
for (i=0; i < xmax-3; ++i) {
//int p = (i-j+1) & 3; // corner type // unused, not sure what the intent was so commenting it out
STB_HBWANG_ASSERT(i+3 < STB_HBWANG_MAX_X+6);
STB_HBWANG_ASSERT(j+3 < STB_HBWANG_MAX_Y+6);
if (stbhw__match(i,j) && stbhw__match(i,j+1) && stbhw__match(i,j+2)
&& stbhw__match(i+1,j) && stbhw__match(i+1,j+1) && stbhw__match(i+1,j+2)) {
int p = ((i+1)-(j+1)+1) & 3;
if (cc[p] > 1)
c_color[j+1][i+1] = stbhw__change_color(c_color[j+1][i+1], cc[p], weighting ? weighting[p] : NULL);
}
if (stbhw__match(i,j) && stbhw__match(i+1,j) && stbhw__match(i+2,j)
&& stbhw__match(i,j+1) && stbhw__match(i+1,j+1) && stbhw__match(i+2,j+1)) {
int p = ((i+2)-(j+1)+1) & 3;
if (cc[p] > 1)
c_color[j+1][i+2] = stbhw__change_color(c_color[j+1][i+2], cc[p], weighting ? weighting[p] : NULL);
}
}
}
#endif
ypos = -1 * sidelen;
for (j = -1; ypos < h; ++j) {
// a general herringbone row consists of:
// horizontal left block, the bottom of a previous vertical, the top of a new vertical
int phase = (j & 3);
// displace horizontally according to pattern
if (phase == 0) {
i = 0;
} else {
i = phase-4;
}
for (;; i += 4) {
int xpos = i * sidelen;
if (xpos >= w)
break;
// horizontal left-block
if (xpos + sidelen*2 >= 0 && ypos >= 0) {
stbhw_tile *t = stbhw__choose_tile(
ts->h_tiles, ts->num_h_tiles,
&c_color[j+2][i+2], &c_color[j+2][i+3], &c_color[j+2][i+4],
&c_color[j+3][i+2], &c_color[j+3][i+3], &c_color[j+3][i+4],
weighting
);
if (t == NULL)
return 0;
stbhw__draw_h_tile(output,stride,w,h, xpos, ypos, t, sidelen);
}
xpos += sidelen * 2;
// now we're at the end of a previous vertical one
xpos += sidelen;
// now we're at the start of a new vertical one
if (xpos < w) {
stbhw_tile *t = stbhw__choose_tile(
ts->v_tiles, ts->num_v_tiles,
&c_color[j+2][i+5], &c_color[j+3][i+5], &c_color[j+4][i+5],
&c_color[j+2][i+6], &c_color[j+3][i+6], &c_color[j+4][i+6],
weighting
);
if (t == NULL)
return 0;
stbhw__draw_v_tile(output,stride,w,h, xpos, ypos, t, sidelen);
}
}
ypos += sidelen;
}
} else {
// @TODO edge-color repetition reduction
int i,j, ypos;
memset(v_color, -1, sizeof(v_color));
memset(h_color, -1, sizeof(h_color));
ypos = -1 * sidelen;
for (j = -1; ypos<h; ++j) {
// a general herringbone row consists of:
// horizontal left block, the bottom of a previous vertical, the top of a new vertical
int phase = (j & 3);
// displace horizontally according to pattern
if (phase == 0) {
i = 0;
} else {
i = phase-4;
}
for (;; i += 4) {
int xpos = i * sidelen;
if (xpos >= w)
break;
// horizontal left-block
if (xpos + sidelen*2 >= 0 && ypos >= 0) {
stbhw_tile *t = stbhw__choose_tile(
ts->h_tiles, ts->num_h_tiles,
&h_color[j+2][i+2], &h_color[j+2][i+3],
&v_color[j+2][i+2], &v_color[j+2][i+4],
&h_color[j+3][i+2], &h_color[j+3][i+3],
weighting
);
if (t == NULL) return 0;
stbhw__draw_h_tile(output,stride,w,h, xpos, ypos, t, sidelen);
}
xpos += sidelen * 2;
// now we're at the end of a previous vertical one
xpos += sidelen;
// now we're at the start of a new vertical one
if (xpos < w) {
stbhw_tile *t = stbhw__choose_tile(
ts->v_tiles, ts->num_v_tiles,
&h_color[j+2][i+5],
&v_color[j+2][i+5], &v_color[j+2][i+6],
&v_color[j+3][i+5], &v_color[j+3][i+6],
&h_color[j+4][i+5],
weighting
);
if (t == NULL) return 0;
stbhw__draw_v_tile(output,stride,w,h, xpos, ypos, t, sidelen);
}
}
ypos += sidelen;
}
}
return 1;
}
static void stbhw__parse_h_rect(stbhw__process *p, int xpos, int ypos,
int a, int b, int c, int d, int e, int f)
{
int len = p->c->short_side_len;
stbhw_tile *h = (stbhw_tile *) malloc(sizeof(*h)-1 + 3 * (len*2) * len);
int i,j;
++xpos;
++ypos;
h->a = a, h->b = b, h->c = c, h->d = d, h->e = e, h->f = f;
for (j=0; j < len; ++j)
for (i=0; i < len*2; ++i)
memcpy(h->pixels + j*(3*len*2) + i*3, p->data+(ypos+j)*p->stride+(xpos+i)*3, 3);
STB_HBWANG_ASSERT(p->ts->num_h_tiles < p->ts->max_h_tiles);
p->ts->h_tiles[p->ts->num_h_tiles++] = h;
}
static void stbhw__parse_v_rect(stbhw__process *p, int xpos, int ypos,
int a, int b, int c, int d, int e, int f)
{
int len = p->c->short_side_len;
stbhw_tile *h = (stbhw_tile *) malloc(sizeof(*h)-1 + 3 * (len*2) * len);
int i,j;
++xpos;
++ypos;
h->a = a, h->b = b, h->c = c, h->d = d, h->e = e, h->f = f;
for (j=0; j < len*2; ++j)
for (i=0; i < len; ++i)
memcpy(h->pixels + j*(3*len) + i*3, p->data+(ypos+j)*p->stride+(xpos+i)*3, 3);
STB_HBWANG_ASSERT(p->ts->num_v_tiles < p->ts->max_v_tiles);
p->ts->v_tiles[p->ts->num_v_tiles++] = h;
}
STBHW_EXTERN int stbhw_build_tileset_from_image(stbhw_tileset *ts, unsigned char *data, int stride, int w, int h)
{
int i, h_count, v_count;
unsigned char header[9];
stbhw_config c = { 0 };
stbhw__process p = { 0 };
// extract binary header
// remove encoding that makes it more visually obvious it encodes actual data
for (i=0; i < 9; ++i)
header[i] = data[w*3 - 1 - i] ^ (i*55);
// extract header info
if (header[7] == 0xc0) {
// corner-type
c.is_corner = 1;
for (i=0; i < 4; ++i)
c.num_color[i] = header[i];
c.num_vary_x = header[4];
c.num_vary_y = header[5];
c.short_side_len = header[6];
} else {
c.is_corner = 0;
// edge-type
for (i=0; i < 6; ++i)
c.num_color[i] = header[i];
c.num_vary_x = header[6];
c.num_vary_y = header[7];
c.short_side_len = header[8];
}
if (c.num_vary_x < 0 || c.num_vary_x > 64 || c.num_vary_y < 0 || c.num_vary_y > 64)
return 0;
if (c.short_side_len == 0)
return 0;
if (c.num_color[0] > 32 || c.num_color[1] > 32 || c.num_color[2] > 32 || c.num_color[3] > 32)
return 0;
stbhw__get_template_info(&c, NULL, NULL, &h_count, &v_count);
ts->is_corner = c.is_corner;
ts->short_side_len = c.short_side_len;
memcpy(ts->num_color, c.num_color, sizeof(ts->num_color));
ts->max_h_tiles = h_count;
ts->max_v_tiles = v_count;
ts->num_h_tiles = ts->num_v_tiles = 0;
ts->h_tiles = (stbhw_tile **) malloc(sizeof(*ts->h_tiles) * h_count);
ts->v_tiles = (stbhw_tile **) malloc(sizeof(*ts->v_tiles) * v_count);
p.ts = ts;
p.data = data;
p.stride = stride;
p.process_h_rect = stbhw__parse_h_rect;
p.process_v_rect = stbhw__parse_v_rect;
p.w = w;
p.h = h;
p.c = &c;
// load all the tiles out of the image
return stbhw__process_template(&p);
}
STBHW_EXTERN void stbhw_free_tileset(stbhw_tileset *ts)
{
int i;
for (i=0; i < ts->num_h_tiles; ++i)
free(ts->h_tiles[i]);
for (i=0; i < ts->num_v_tiles; ++i)
free(ts->v_tiles[i]);
free(ts->h_tiles);
free(ts->v_tiles);
ts->h_tiles = NULL;
ts->v_tiles = NULL;
ts->num_h_tiles = ts->max_h_tiles = 0;
ts->num_v_tiles = ts->max_v_tiles = 0;
}
//////////////////////////////////////////////////////////////////////////////
//
// GENERATOR
//
//
// shared code
static void stbhw__set_pixel(unsigned char *data, int stride, int xpos, int ypos, unsigned char color[3])
{
memcpy(data + ypos*stride + xpos*3, color, 3);
}
static void stbhw__stbhw__set_pixel_whiten(unsigned char *data, int stride, int xpos, int ypos, unsigned char color[3])
{
unsigned char c2[3];
int i;
for (i=0; i < 3; ++i)
c2[i] = (color[i]*2 + 255)/3;
memcpy(data + ypos*stride + xpos*3, c2, 3);
}
static unsigned char stbhw__black[3] = { 0,0,0 };
// each edge set gets its own unique color variants
// used http://phrogz.net/css/distinct-colors.html to generate this set,
// but it's not very good and needs to be revised
static unsigned char stbhw__color[7][8][3] =
{
{ {255,51,51} , {143,143,29}, {0,199,199}, {159,119,199}, {0,149,199} , {143, 0,143}, {255,128,0}, {64,255,0}, },
{ {235,255,30 }, {255,0,255}, {199,139,119}, {29,143, 57}, {143,0,71} , { 0,143,143}, {0,99,199}, {143,71,0}, },
{ {0,149,199} , {143, 0,143}, {255,128,0}, {64,255,0}, {255,191,0} , {51,255,153}, {0,0,143}, {199,119,159},},
{ {143,0,71} , { 0,143,143}, {0,99,199}, {143,71,0}, {255,190,153}, { 0,255,255}, {128,0,255}, {255,51,102},},
{ {255,191,0} , {51,255,153}, {0,0,143}, {199,119,159}, {255,51,51} , {143,143,29}, {0,199,199}, {159,119,199},},
{ {255,190,153}, { 0,255,255}, {128,0,255}, {255,51,102}, {235,255,30 }, {255,0,255}, {199,139,119}, {29,143, 57}, },
{ {40,40,40 }, { 90,90,90 }, { 150,150,150 }, { 200,200,200 },
{ 255,90,90 }, { 160,160,80}, { 50,150,150 }, { 200,50,200 } },
};
static void stbhw__draw_hline(unsigned char *data, int stride, int xpos, int ypos, int color, int len, int slot)
{
int i;
int j = len * 6 / 16;