forked from fltk/fltk
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathglpuzzle.cxx
1455 lines (1310 loc) · 29.2 KB
/
glpuzzle.cxx
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
// This is a GLUT demo program to demonstrate fltk's GLUT emulation.
// Search for "fltk" to find all the changes
// this block added for fltk's distribtion so it will compile w/o OpenGL:
#include <config.h>
#if !HAVE_GL
#include <FL/Fl.H>
#include <FL/fl_message.H>
int main(int, char**) {
fl_alert("This demo does not work without GL");
return 1;
}
#else
// end of added block
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include <math.h>
#include <FL/glut.H> // changed for fltk
#include "trackball.c" // changed from trackball.h for fltk
#define WIDTH 4
#define HEIGHT 5
#define PIECES 10
#define OFFSETX -2
#define OFFSETY -2.5
#define OFFSETZ -0.5
typedef char Config[HEIGHT][WIDTH];
struct puzzle {
struct puzzle *backptr;
struct puzzle *solnptr;
Config pieces;
struct puzzle *next;
unsigned hashvalue;
};
#define HASHSIZE 10691
struct puzzlelist {
struct puzzle *puzzle;
struct puzzlelist *next;
};
static char convert[PIECES + 1] =
{0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 4};
static unsigned char colors[PIECES + 1][3] =
{
{0, 0, 0},
{255, 255, 127},
{255, 255, 127},
{255, 255, 127},
{255, 255, 127},
{255, 127, 255},
{255, 127, 255},
{255, 127, 255},
{255, 127, 255},
{255, 127, 127},
{255, 255, 255},
};
void changeState(void);
static struct puzzle *hashtable[HASHSIZE];
static struct puzzle *startPuzzle;
static struct puzzlelist *puzzles;
static struct puzzlelist *lastentry;
int curX, curY, visible;
#define MOVE_SPEED 0.2
static unsigned char movingPiece;
static float move_x, move_y;
static float curquat[4];
static int doubleBuffer = 1;
static int depth = 1;
static char xsize[PIECES + 1] =
{0, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2};
static char ysize[PIECES + 1] =
{0, 1, 1, 1, 1, 2, 2, 2, 2, 1, 2};
static float zsize[PIECES + 1] =
{0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0.6};
static Config startConfig =
{
{8, 10, 10, 7},
{8, 10, 10, 7},
{6, 9, 9, 5},
{6, 4, 3, 5},
{2, 0, 0, 1}
};
static Config thePuzzle =
{
{8, 10, 10, 7},
{8, 10, 10, 7},
{6, 9, 9, 5},
{6, 4, 3, 5},
{2, 0, 0, 1}
};
static int xadds[4] =
{-1, 0, 1, 0};
static int yadds[4] =
{0, -1, 0, 1};
static long W = 400, H = 300;
static GLint viewport[4];
#define srandom srand
#define random() (rand() >> 2)
unsigned
hash(Config config)
{
int i, j, value;
value = 0;
for (i = 0; i < HEIGHT; i++) {
for (j = 0; j < WIDTH; j++) {
value = value + convert[config[i][j]];
value *= 6;
}
}
return (value);
}
int
solution(Config config)
{
if (config[4][1] == 10 && config[4][2] == 10)
return (1);
return (0);
}
float boxcoords[][3] =
{
{0.2, 0.2, 0.9},
{0.8, 0.2, 0.9},
{0.8, 0.8, 0.9},
{0.2, 0.8, 0.9},
{0.2, 0.1, 0.8},
{0.8, 0.1, 0.8},
{0.9, 0.2, 0.8},
{0.9, 0.8, 0.8},
{0.8, 0.9, 0.8},
{0.2, 0.9, 0.8},
{0.1, 0.8, 0.8},
{0.1, 0.2, 0.8},
{0.2, 0.1, 0.2},
{0.8, 0.1, 0.2},
{0.9, 0.2, 0.2},
{0.9, 0.8, 0.2},
{0.8, 0.9, 0.2},
{0.2, 0.9, 0.2},
{0.1, 0.8, 0.2},
{0.1, 0.2, 0.2},
{0.2, 0.2, 0.1},
{0.8, 0.2, 0.1},
{0.8, 0.8, 0.1},
{0.2, 0.8, 0.1},
};
float boxnormals[][3] =
{
{0, 0, 1}, /* 0 */
{0, 1, 0},
{1, 0, 0},
{0, 0, -1},
{0, -1, 0},
{-1, 0, 0},
{0.7071, 0.7071, 0.0000}, /* 6 */
{0.7071, -0.7071, 0.0000},
{-0.7071, 0.7071, 0.0000},
{-0.7071, -0.7071, 0.0000},
{0.7071, 0.0000, 0.7071}, /* 10 */
{0.7071, 0.0000, -0.7071},
{-0.7071, 0.0000, 0.7071},
{-0.7071, 0.0000, -0.7071},
{0.0000, 0.7071, 0.7071}, /* 14 */
{0.0000, 0.7071, -0.7071},
{0.0000, -0.7071, 0.7071},
{0.0000, -0.7071, -0.7071},
{0.5774, 0.5774, 0.5774}, /* 18 */
{0.5774, 0.5774, -0.5774},
{0.5774, -0.5774, 0.5774},
{0.5774, -0.5774, -0.5774},
{-0.5774, 0.5774, 0.5774},
{-0.5774, 0.5774, -0.5774},
{-0.5774, -0.5774, 0.5774},
{-0.5774, -0.5774, -0.5774},
};
int boxfaces[][4] =
{
{0, 1, 2, 3}, /* 0 */
{9, 8, 16, 17},
{6, 14, 15, 7},
{20, 23, 22, 21},
{12, 13, 5, 4},
{19, 11, 10, 18},
{7, 15, 16, 8}, /* 6 */
{13, 14, 6, 5},
{18, 10, 9, 17},
{19, 12, 4, 11},
{1, 6, 7, 2}, /* 10 */
{14, 21, 22, 15},
{11, 0, 3, 10},
{20, 19, 18, 23},
{3, 2, 8, 9}, /* 14 */
{17, 16, 22, 23},
{4, 5, 1, 0},
{20, 21, 13, 12},
{2, 7, 8, -1}, /* 18 */
{16, 15, 22, -1},
{5, 6, 1, -1},
{13, 21, 14, -1},
{10, 3, 9, -1},
{18, 17, 23, -1},
{11, 4, 0, -1},
{20, 12, 19, -1},
};
#define NBOXFACES (sizeof(boxfaces)/sizeof(boxfaces[0]))
/* Draw a box. Bevel as desired. */
void
drawBox(int piece, float xoff, float yoff)
{
int xlen, ylen;
int i, k;
float x, y, z;
float zlen;
float *v;
xlen = xsize[piece];
ylen = ysize[piece];
zlen = zsize[piece];
glColor3ubv(colors[piece]);
glBegin(GL_QUADS);
for (i = 0; i < 18; i++) {
glNormal3fv(boxnormals[i]);
for (k = 0; k < 4; k++) {
if (boxfaces[i][k] == -1)
continue;
v = boxcoords[boxfaces[i][k]];
x = v[0] + OFFSETX;
if (v[0] > 0.5)
x += xlen - 1;
y = v[1] + OFFSETY;
if (v[1] > 0.5)
y += ylen - 1;
z = v[2] + OFFSETZ;
if (v[2] > 0.5)
z += zlen - 1;
glVertex3f(xoff + x, yoff + y, z);
}
}
glEnd();
glBegin(GL_TRIANGLES);
for (i = 18; i < int(NBOXFACES); i++) {
glNormal3fv(boxnormals[i]);
for (k = 0; k < 3; k++) {
if (boxfaces[i][k] == -1)
continue;
v = boxcoords[boxfaces[i][k]];
x = v[0] + OFFSETX;
if (v[0] > 0.5)
x += xlen - 1;
y = v[1] + OFFSETY;
if (v[1] > 0.5)
y += ylen - 1;
z = v[2] + OFFSETZ;
if (v[2] > 0.5)
z += zlen - 1;
glVertex3f(xoff + x, yoff + y, z);
}
}
glEnd();
}
float containercoords[][3] =
{
{-0.1, -0.1, 1.0},
{-0.1, -0.1, -0.1},
{4.1, -0.1, -0.1},
{4.1, -0.1, 1.0},
{1.0, -0.1, 0.6}, /* 4 */
{3.0, -0.1, 0.6},
{1.0, -0.1, 0.0},
{3.0, -0.1, 0.0},
{1.0, 0.0, 0.0}, /* 8 */
{3.0, 0.0, 0.0},
{3.0, 0.0, 0.6},
{1.0, 0.0, 0.6},
{0.0, 0.0, 1.0}, /* 12 */
{4.0, 0.0, 1.0},
{4.0, 0.0, 0.0},
{0.0, 0.0, 0.0},
{0.0, 5.0, 0.0}, /* 16 */
{0.0, 5.0, 1.0},
{4.0, 5.0, 1.0},
{4.0, 5.0, 0.0},
{-0.1, 5.1, -0.1}, /* 20 */
{4.1, 5.1, -0.1},
{4.1, 5.1, 1.0},
{-0.1, 5.1, 1.0},
};
float containernormals[][3] =
{
{0, -1, 0},
{0, -1, 0},
{0, -1, 0},
{0, -1, 0},
{0, -1, 0},
{0, 1, 0},
{0, 1, 0},
{0, 1, 0},
{1, 0, 0},
{1, 0, 0},
{1, 0, 0},
{-1, 0, 0},
{-1, 0, 0},
{-1, 0, 0},
{0, 1, 0},
{0, 0, -1},
{0, 0, -1},
{0, 0, 1},
{0, 0, 1},
{0, 0, 1},
{0, 0, 1},
{0, 0, 1},
{0, 0, 1},
{0, 0, 1},
};
int containerfaces[][4] =
{
{1, 6, 4, 0},
{0, 4, 5, 3},
{1, 2, 7, 6},
{7, 2, 3, 5},
{16, 19, 18, 17},
{23, 22, 21, 20},
{12, 11, 8, 15},
{10, 13, 14, 9},
{15, 16, 17, 12},
{2, 21, 22, 3},
{6, 8, 11, 4},
{1, 0, 23, 20},
{14, 13, 18, 19},
{9, 7, 5, 10},
{12, 13, 10, 11},
{1, 20, 21, 2},
{4, 11, 10, 5},
{15, 8, 19, 16},
{19, 8, 9, 14},
{8, 6, 7, 9},
{0, 3, 13, 12},
{13, 3, 22, 18},
{18, 22, 23, 17},
{17, 23, 0, 12},
};
#define NCONTFACES (sizeof(containerfaces)/sizeof(containerfaces[0]))
/* Draw the container */
void
drawContainer(void)
{
int i, k;
float *v;
/* Y is reversed here because the model has it reversed */
/* Arbitrary bright wood-like color */
glColor3ub(209, 103, 23);
glBegin(GL_QUADS);
for (i = 0; i < int(NCONTFACES); i++) {
v = containernormals[i];
glNormal3f(v[0], -v[1], v[2]);
for (k = 3; k >= 0; k--) {
v = containercoords[containerfaces[i][k]];
glVertex3f(v[0] + OFFSETX, -(v[1] + OFFSETY), v[2] + OFFSETZ);
}
}
glEnd();
}
void
drawAll(void)
{
int i, j;
int piece;
char done[PIECES + 1];
float m[4][4];
build_rotmatrix(m, curquat);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0, 0, -10);
glMultMatrixf(&(m[0][0]));
glRotatef(180, 0, 0, 1);
if (depth) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
} else {
glClear(GL_COLOR_BUFFER_BIT);
}
for (i = 1; i <= PIECES; i++) {
done[i] = 0;
}
glLoadName(0);
drawContainer();
for (i = 0; i < HEIGHT; i++) {
for (j = 0; j < WIDTH; j++) {
piece = thePuzzle[i][j];
if (piece == 0)
continue;
if (done[piece])
continue;
done[piece] = 1;
glLoadName(piece);
if (piece == movingPiece) {
drawBox(piece, move_x, move_y);
} else {
drawBox(piece, j, i);
}
}
}
}
void
redraw(void)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45, 1.0, 0.1, 100.0);
drawAll();
if (doubleBuffer)
glutSwapBuffers();
else
glFinish();
}
void
solidifyChain(struct puzzle *puzzle)
{
int i;
char buf[256];
i = 0;
while (puzzle->backptr) {
i++;
puzzle->backptr->solnptr = puzzle;
puzzle = puzzle->backptr;
}
sprintf(buf, "%d moves to complete!", i);
glutSetWindowTitle(buf);
}
int
addConfig(Config config, struct puzzle *back)
{
unsigned hashvalue;
struct puzzle *newpiece;
struct puzzlelist *newlistentry;
hashvalue = hash(config);
newpiece = hashtable[hashvalue % HASHSIZE];
while (newpiece != NULL) {
if (newpiece->hashvalue == hashvalue) {
int i, j;
for (i = 0; i < WIDTH; i++) {
for (j = 0; j < HEIGHT; j++) {
if (convert[config[j][i]] !=
convert[newpiece->pieces[j][i]])
goto nomatch;
}
}
return 0;
}
nomatch:
newpiece = newpiece->next;
}
newpiece = (struct puzzle *) malloc(sizeof(struct puzzle));
newpiece->next = hashtable[hashvalue % HASHSIZE];
newpiece->hashvalue = hashvalue;
memcpy(newpiece->pieces, config, HEIGHT * WIDTH);
newpiece->backptr = back;
newpiece->solnptr = NULL;
hashtable[hashvalue % HASHSIZE] = newpiece;
newlistentry = (struct puzzlelist *) malloc(sizeof(struct puzzlelist));
newlistentry->puzzle = newpiece;
newlistentry->next = NULL;
if (lastentry) {
lastentry->next = newlistentry;
} else {
puzzles = newlistentry;
}
lastentry = newlistentry;
if (back == NULL) {
startPuzzle = newpiece;
}
if (solution(config)) {
solidifyChain(newpiece);
return 1;
}
return 0;
}
/* Checks if a space can move */
int
canmove0(Config pieces, int x, int y, int dir, Config newpieces)
{
char piece;
int xadd, yadd;
int l, m;
xadd = xadds[dir];
yadd = yadds[dir];
if (x + xadd < 0 || x + xadd >= WIDTH ||
y + yadd < 0 || y + yadd >= HEIGHT)
return 0;
piece = pieces[y + yadd][x + xadd];
if (piece == 0)
return 0;
memcpy(newpieces, pieces, HEIGHT * WIDTH);
for (l = 0; l < WIDTH; l++) {
for (m = 0; m < HEIGHT; m++) {
if (newpieces[m][l] == piece)
newpieces[m][l] = 0;
}
}
xadd = -xadd;
yadd = -yadd;
for (l = 0; l < WIDTH; l++) {
for (m = 0; m < HEIGHT; m++) {
if (pieces[m][l] == piece) {
int newx, newy;
newx = l + xadd;
newy = m + yadd;
if (newx < 0 || newx >= WIDTH ||
newy < 0 || newy >= HEIGHT)
return 0;
if (newpieces[newy][newx] != 0)
return 0;
newpieces[newy][newx] = piece;
}
}
}
return 1;
}
/* Checks if a piece can move */
int
canmove(Config pieces, int x, int y, int dir, Config newpieces)
{
int xadd, yadd;
xadd = xadds[dir];
yadd = yadds[dir];
if (x + xadd < 0 || x + xadd >= WIDTH ||
y + yadd < 0 || y + yadd >= HEIGHT)
return 0;
if (pieces[y + yadd][x + xadd] == pieces[y][x]) {
return canmove(pieces, x + xadd, y + yadd, dir, newpieces);
}
if (pieces[y + yadd][x + xadd] != 0)
return 0;
return canmove0(pieces, x + xadd, y + yadd, (dir + 2) % 4, newpieces);
}
int
generateNewConfigs(struct puzzle *puzzle)
{
int i, j, k;
Config pieces;
Config newpieces;
memcpy(pieces, puzzle->pieces, HEIGHT * WIDTH);
for (i = 0; i < WIDTH; i++) {
for (j = 0; j < HEIGHT; j++) {
if (pieces[j][i] == 0) {
for (k = 0; k < 4; k++) {
if (canmove0(pieces, i, j, k, newpieces)) {
if (addConfig(newpieces, puzzle))
return 1;
}
}
}
}
}
return 0;
}
void
freeSolutions(void)
{
struct puzzlelist *nextpuz;
struct puzzle *puzzle, *next;
int i;
while (puzzles) {
nextpuz = puzzles->next;
free((char *) puzzles);
puzzles = nextpuz;
}
lastentry = NULL;
for (i = 0; i < HASHSIZE; i++) {
puzzle = hashtable[i];
hashtable[i] = NULL;
while (puzzle) {
next = puzzle->next;
free((char *) puzzle);
puzzle = next;
}
}
startPuzzle = NULL;
}
int
continueSolving(void)
{
struct puzzle *nextpuz;
int i, j;
int movedPiece;
int movedir;
int fromx, fromy;
int tox, toy;
if (startPuzzle == NULL)
return 0;
if (startPuzzle->solnptr == NULL) {
freeSolutions();
return 0;
}
nextpuz = startPuzzle->solnptr;
movedPiece = 0;
movedir = 0;
for (i = 0; i < HEIGHT; i++) {
for (j = 0; j < WIDTH; j++) {
if (startPuzzle->pieces[i][j] != nextpuz->pieces[i][j]) {
if (startPuzzle->pieces[i][j]) {
movedPiece = startPuzzle->pieces[i][j];
fromx = j;
fromy = i;
if (i < HEIGHT - 1 && nextpuz->pieces[i + 1][j] == movedPiece) {
movedir = 3;
} else {
movedir = 2;
}
goto found_piece;
} else {
movedPiece = nextpuz->pieces[i][j];
if (i < HEIGHT - 1 &&
startPuzzle->pieces[i + 1][j] == movedPiece) {
fromx = j;
fromy = i + 1;
movedir = 1;
} else {
fromx = j + 1;
fromy = i;
movedir = 0;
}
goto found_piece;
}
}
}
}
glutSetWindowTitle("What! No change?");
freeSolutions();
return 0;
found_piece:
if (!movingPiece) {
movingPiece = movedPiece;
move_x = fromx;
move_y = fromy;
}
move_x += xadds[movedir] * MOVE_SPEED;
move_y += yadds[movedir] * MOVE_SPEED;
tox = fromx + xadds[movedir];
toy = fromy + yadds[movedir];
if (move_x > tox - MOVE_SPEED / 2 && move_x < tox + MOVE_SPEED / 2 &&
move_y > toy - MOVE_SPEED / 2 && move_y < toy + MOVE_SPEED / 2) {
startPuzzle = nextpuz;
movingPiece = 0;
}
memcpy(thePuzzle, startPuzzle->pieces, HEIGHT * WIDTH);
changeState();
return 1;
}
int
solvePuzzle(void)
{
struct puzzlelist *nextpuz;
char buf[256];
int i;
if (solution(thePuzzle)) {
glutSetWindowTitle("Puzzle already solved!");
return 0;
}
addConfig(thePuzzle, NULL);
i = 0;
while (puzzles) {
i++;
if (generateNewConfigs(puzzles->puzzle))
break;
nextpuz = puzzles->next;
free((char *) puzzles);
puzzles = nextpuz;
}
if (puzzles == NULL) {
freeSolutions();
sprintf(buf, "I can't solve it! (%d positions examined)", i);
glutSetWindowTitle(buf);
return 1;
}
return 1;
}
int
selectPiece(int mousex, int mousey)
{
long hits;
GLuint selectBuf[1024];
GLuint closest;
GLuint dist;
glSelectBuffer(1024, selectBuf);
(void) glRenderMode(GL_SELECT);
glInitNames();
/* Because LoadName() won't work with no names on the stack */
glPushName(0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPickMatrix(mousex, H - mousey, 4, 4, viewport);
gluPerspective(45, 1.0, 0.1, 100.0);
drawAll();
hits = glRenderMode(GL_RENDER);
if (hits <= 0) {
return 0;
}
closest = 0;
dist = 4294967295;
while (hits) {
if (selectBuf[(hits - 1) * 4 + 1] < dist) {
dist = selectBuf[(hits - 1) * 4 + 1];
closest = selectBuf[(hits - 1) * 4 + 3];
}
hits--;
}
return closest;
}
void
nukePiece(int piece)
{
int i, j;
for (i = 0; i < HEIGHT; i++) {
for (j = 0; j < WIDTH; j++) {
if (thePuzzle[i][j] == piece) {
thePuzzle[i][j] = 0;
}
}
}
}
void
multMatrices(const GLfloat a[16], const GLfloat b[16], GLfloat r[16])
{
int i, j;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
r[i * 4 + j] =
a[i * 4 + 0] * b[0 * 4 + j] +
a[i * 4 + 1] * b[1 * 4 + j] +
a[i * 4 + 2] * b[2 * 4 + j] +
a[i * 4 + 3] * b[3 * 4 + j];
}
}
}
void
makeIdentity(GLfloat m[16])
{
m[0 + 4 * 0] = 1;
m[0 + 4 * 1] = 0;
m[0 + 4 * 2] = 0;
m[0 + 4 * 3] = 0;
m[1 + 4 * 0] = 0;
m[1 + 4 * 1] = 1;
m[1 + 4 * 2] = 0;
m[1 + 4 * 3] = 0;
m[2 + 4 * 0] = 0;
m[2 + 4 * 1] = 0;
m[2 + 4 * 2] = 1;
m[2 + 4 * 3] = 0;
m[3 + 4 * 0] = 0;
m[3 + 4 * 1] = 0;
m[3 + 4 * 2] = 0;
m[3 + 4 * 3] = 1;
}
/*
** inverse = invert(src)
*/
int
invertMatrix(const GLfloat src[16], GLfloat inverse[16])
{
int i, j, k, swap;
double t;
GLfloat temp[4][4];
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
temp[i][j] = src[i * 4 + j];
}
}
makeIdentity(inverse);
for (i = 0; i < 4; i++) {
/*
** Look for largest element in column */
swap = i;
for (j = i + 1; j < 4; j++) {
if (fabs(temp[j][i]) > fabs(temp[i][i])) {
swap = j;
}
}
if (swap != i) {
/*
** Swap rows. */
for (k = 0; k < 4; k++) {
t = temp[i][k];
temp[i][k] = temp[swap][k];
temp[swap][k] = t;
t = inverse[i * 4 + k];
inverse[i * 4 + k] = inverse[swap * 4 + k];
inverse[swap * 4 + k] = t;
}
}
if (temp[i][i] == 0) {
/*
** No non-zero pivot. The matrix is singular, which
shouldn't ** happen. This means the user gave us a
bad matrix. */
return 0;
}
t = temp[i][i];
for (k = 0; k < 4; k++) {
temp[i][k] /= t;
inverse[i * 4 + k] /= t;
}
for (j = 0; j < 4; j++) {
if (j != i) {
t = temp[j][i];
for (k = 0; k < 4; k++) {
temp[j][k] -= temp[i][k] * t;
inverse[j * 4 + k] -= inverse[i * 4 + k] * t;
}
}
}
}
return 1;
}
/*
** This is a screwball function. What it does is the following:
** Given screen x and y coordinates, compute the corresponding object space
** x and y coordinates given that the object space z is 0.9 + OFFSETZ.
** Since the tops of (most) pieces are at z = 0.9 + OFFSETZ, we use that
** number.
*/
int
computeCoords(int piece, int mousex, int mousey,
GLfloat * selx, GLfloat * sely)
{
GLfloat modelMatrix[16];
GLfloat projMatrix[16];
GLfloat finalMatrix[16];
GLfloat in[4];
GLfloat a, b, c, d;
GLfloat top, bot;
GLfloat z;
GLfloat w;
GLfloat height;
if (piece == 0)
return 0;
height = zsize[piece] - 0.1 + OFFSETZ;
glGetFloatv(GL_PROJECTION_MATRIX, projMatrix);
glGetFloatv(GL_MODELVIEW_MATRIX, modelMatrix);
multMatrices(modelMatrix, projMatrix, finalMatrix);
if (!invertMatrix(finalMatrix, finalMatrix))
return 0;
in[0] = (2.0 * (mousex - viewport[0]) / viewport[2]) - 1;
in[1] = (2.0 * ((H - mousey) - viewport[1]) / viewport[3]) - 1;
a = in[0] * finalMatrix[0 * 4 + 2] +
in[1] * finalMatrix[1 * 4 + 2] +
finalMatrix[3 * 4 + 2];
b = finalMatrix[2 * 4 + 2];
c = in[0] * finalMatrix[0 * 4 + 3] +
in[1] * finalMatrix[1 * 4 + 3] +
finalMatrix[3 * 4 + 3];
d = finalMatrix[2 * 4 + 3];
/*
** Ok, now we need to solve for z: ** (a + b z) / (c + d
z) = height. ** ("height" is the height in object space we
want to solve z for) ** ** ==> a + b z = height c +
height d z ** bz - height d z = height c - a ** z =
(height c - a) / (b - height d) */
top = height * c - a;
bot = b - height * d;
if (bot == 0.0)
return 0;
z = top / bot;
/*
** Ok, no problem. ** Now we solve for x and y. We know
that w = c + d z, so we compute it. */
w = c + d * z;
/*
** Now for x and y: */
*selx = (in[0] * finalMatrix[0 * 4 + 0] +
in[1] * finalMatrix[1 * 4 + 0] +
z * finalMatrix[2 * 4 + 0] +
finalMatrix[3 * 4 + 0]) / w - OFFSETX;
*sely = (in[0] * finalMatrix[0 * 4 + 1] +
in[1] * finalMatrix[1 * 4 + 1] +
z * finalMatrix[2 * 4 + 1] +
finalMatrix[3 * 4 + 1]) / w - OFFSETY;
return 1;
}
static int selected;
static int selectx, selecty;
static float selstartx, selstarty;
void
grabPiece(int piece, float selx, float sely)
{
int hit;
selectx = int(selx);
selecty = int(sely);
if (selectx < 0 || selecty < 0 || selectx >= WIDTH || selecty >= HEIGHT) {
return;
}
hit = thePuzzle[selecty][selectx];
if (hit != piece)
return;
if (hit) {