dbf-halloween2015: c37fe5d8a4ed src/dsys/dsys.c

dbf-halloween2015

view src/dsys/dsys.c @ 3:c37fe5d8a4ed

windows port

author	John Tsiombikas <nuclear@member.fsf.org>
date	Sun, 01 Nov 2015 06:04:28 +0200
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children

line source

1 #include <stdio.h>

2 #include <math.h>

3 #include <stdlib.h>

4 #include <string.h>

5 #include <ctype.h>

6 #include <errno.h>

7 #include "dsys.h"

8 #include "dsys_impl.h"

10 static int read_script(struct dsys_demo *demo, FILE *fp, const char *fname);

11 static char *strip_ws(char *buf);

12 static void dbg_print_events(struct dsys_event *ev);

14 static void proc_event(struct dsys_event *ev, demotime_t tm);

15 static void link_callback(struct dsys_event *ev, void *cls);

16 static void free_event(struct dsys_event *ev);

18 static struct dsys_event *sort_evlist(struct dsys_event *list, int num_ev);

19 static struct dsys_event *merge_evlists(struct dsys_event *list1, struct dsys_event *list2);

22 struct dsys_demo *dsys_open(const char *fname)

23 {

24 FILE *fp;

25 struct dsys_demo *demo;

27 if(!(fp = fopen(fname, "r"))) {

28 fprintf(stderr, "failed to open demoscript: %s: %s\n", fname, strerror(errno));

29 return 0;

30 }

32 if(!(demo = malloc(sizeof *demo))) {

33 perror("failed to allocate memory");

34 fclose(fp);

35 return 0;

36 }

37 memset(demo, 0, sizeof *demo);

39 demo->src_tm = demo->start_tm = -1;

41 if(read_script(demo, fp, fname) == -1) {

42 free(demo);

43 fclose(fp);

44 return 0;

45 }

47 fclose(fp);

48 return demo;

49 }

51 struct dsys_demo *dsys_open_stream(FILE *fp)

52 {

53 struct dsys_demo *demo;

55 if(!(demo = malloc(sizeof *demo))) {

56 perror("failed to allocate memory");

57 return 0;

58 }

59 memset(demo, 0, sizeof *demo);

61 demo->src_tm = demo->start_tm = -1;

63 if(read_script(demo, fp, 0) == -1) {

64 free(demo);

65 return 0;

66 }

68 return demo;

69 }

71 void dsys_close(struct dsys_demo *demo)

72 {

73 while(demo->evlist) {

74 struct dsys_event *ev = demo->evlist;

75 demo->evlist = demo->evlist->next;

76 free_event(ev);

77 }

79 free(demo);

80 }

83 #define SEP " \t\n\r"

85 static int read_script(struct dsys_demo *demo, FILE *fp, const char *fname)

86 {

87 int nline = 0;

88 char buf[512], *line, *tok, *endp;

89 unsigned int t0, t1;

90 struct dsys_event *ev;

92 if(!fname) {

93 fname = "<unknown>";

94 }

96 demo->duration = dsys_msec_to_dtime(0);

98 while(fgets(buf, sizeof buf, fp)) {

99 nline++;

100

101 line = strip_ws(buf);

102

103 if(!line || !*line) {

104 continue;

105 }

106

107 if(!(tok = strtok(line, SEP)) || (t0 = strtol(tok, &endp, 10), endp == tok)) {

108 fprintf(stderr, "%s line: %d, error: expected timestamp t0\n", fname, nline);

109 return -1;

110 }

111

112 if(!(tok = strtok(0, SEP))) {

113 fprintf(stderr, "%s line: %d, error: expected second timestamp or event name\n", fname, nline);

114 return -1;

115 }

116

117 t1 = strtol(tok, &endp, 10);

118 if(endp == tok) {

119 t1 = t0;

120 } else {

121 if(!(tok = strtok(0, SEP))) {

122 fprintf(stderr, "%s line: %d, error: expected event name\n", fname, nline);

123 return -1;

124 }

125 }

126

127 if(!(ev = malloc(sizeof *ev))) {

128 perror("read_script: failed to allocate memory for an event\n");

129 return -1;

130 }

131 memset(ev, 0, sizeof *ev);

132 ev->t0 = dsys_msec_to_dtime(t0);

133 ev->t1 = dsys_msec_to_dtime(t1);

134

135 if(!(ev->name = malloc(strlen(tok) + 1))) {

136 free(ev);

137 fprintf(stderr, "read_script: failed to allocate memory for the event name: %s\n", tok);

138 return -1;

139 }

140 strcpy(ev->name, tok);

141

142 ev->eval = t0 == t1 ? dsys_eval_step : dsys_eval_lerp;

143

144 ev->next = demo->evlist;

145 ev->prev = 0;

146 if(demo->evlist) {

147 demo->evlist->prev = ev;

148 }

149 demo->evlist = ev;

150 demo->num_ev++;

151

152 if(ev->t1 > demo->duration) {

153 demo->duration = ev->t1;

154 }

155 }

156

157 demo->evlist = sort_evlist(demo->evlist, demo->num_ev);

158

159 /*dbg_print_events(demo->evlist);*/

160

161 return 0;

162 }

163

164 static char *strip_ws(char *buf)

165 {

166 char *ptr;

167

168 while(isspace(*buf)) {

169 buf++;

170 }

171

172 ptr = buf;

173 while(*ptr) {

174 if(*ptr == '\n' || *ptr == '\r' || *ptr == '#') {

175 *ptr = 0;

176 break;

177 }

178 ptr++;

179 }

180

181 return buf;

182 }

183

184 /*static void dbg_print_events(struct dsys_event *ev)

185 {

186 int i;

187

188 for(i=0; ev; i++) {

189 printf("%02d - %s (%f -> %f) [%s]\n", i, ev->eval == dsys_eval_step ? "step" : "lerp",

190 ev->t0, ev->t1, ev->name);

191 ev = ev->next;

192 }

193 }*/

194

195 void dsys_update(struct dsys_demo *demo, demotime_t tm)

196 {

197 struct dsys_event *ev;

198

199 demo->src_tm = tm;

200

201 if(demo->start_tm == -1) {

202 dsys_start(demo);

203 }

204

205 if(!demo->running) {

206 return; /* nothing changes */

207 }

208

209 demo->tm = tm - demo->start_tm - demo->stoppage_tm;

210

211 if(demo->tm < 0) {

212 demo->tm = 0;

213 }

214 if(demo->tm > demo->duration) {

215 demo->tm = demo->duration;

216 }

217

218 while(demo->active && demo->active->t1 <= demo->tm) {

219 proc_event(demo->active, demo->tm);

220 demo->active = demo->active->next;

221 }

222

223 ev = demo->active;

224 while(ev && ev->t0 <= demo->tm) {

225 proc_event(ev, demo->tm);

226 ev = ev->next;

227 }

228 demo->nextev = ev;

229

230

231 if(demo->tm >= demo->duration) {

232 dsys_stop(demo);

233 }

234 }

235

236 static void proc_event(struct dsys_event *ev, demotime_t tm)

237 {

238 float val = ev->eval(ev, tm);

239

240 if(ev->val != val) {

241 struct callback *cb = ev->cblist;

242

243 ev->val = val;

244

245 while(cb) {

246 cb->func(ev, cb->cls);

247 cb = cb->next;

248 }

249 }

250 }

251

252 void dsys_start(struct dsys_demo *demo)

253 {

254 if(demo->running) {

255 return;

256 }

257

258 if(demo->start_tm == -1) {

259 demo->start_tm = demo->src_tm;

260 demo->nextev = demo->active = demo->evlist;

261 } else {

262 demo->stoppage_tm += demo->src_tm - demo->stop_tm;

263 }

264

265 demo->running = 1;

266 }

267

268 void dsys_stop(struct dsys_demo *demo)

269 {

270 if(!demo->running) {

271 return;

272 }

273

274 demo->stop_tm = demo->src_tm;

275 demo->running = 0;

276 }

277

278 int dsys_is_running(struct dsys_demo *demo)

279 {

280 return demo->running;

281 }

282

283

284 demotime_t dsys_duration(struct dsys_demo *demo)

285 {

286 return demo->duration;

287 }

288

289 demotime_t dsys_time(struct dsys_demo *demo)

290 {

291 return demo->tm;

292 }

293

294 float dsys_progress(struct dsys_demo *demo)

295 {

296 return demo->tm / demo->duration;

297 }

298

299 /* seek without continuity */

300 void dsys_seek(struct dsys_demo *demo, demotime_t tm)

301 {

302 struct dsys_event *ev;

303

304 if(tm < 0) {

305 tm = 0;

306 }

307 if(tm > demo->duration) {

308 tm = demo->duration;

309 }

310

311 if(tm < demo->tm) {

312 /* on backwards seek, invalidate the sliding window */

313 demo->nextev = demo->active = demo->evlist;

314 }

315

316 demo->start_tm = demo->src_tm - tm;

317 demo->stoppage_tm = 0;

318 demo->stop_tm = demo->src_tm;

319 demo->tm = tm;

320

321 /* recalculate events */

322 ev = demo->evlist;

323 while(ev) {

324 proc_event(ev, tm);

325 ev = ev->next;

326 }

327 }

328

329 void dsys_seek_norm(struct dsys_demo *demo, float t)

330 {

331 dsys_seek(demo, t * demo->duration);

332 }

333

334 /* seek by accelerating time */

335 void dsys_warp(struct dsys_demo *demo, demotime_t tm)

336 {

337 fprintf(stderr, "dsys_warp not implemented yet\n");

338 }

339

340 void dsys_warp_norm(struct dsys_demo *demo, float t)

341 {

342 dsys_warp(demo, t * demo->duration);

343 }

344

345

346 /* events */

347 struct dsys_event *dsys_event(struct dsys_demo *demo, const char *name)

348 {

349 struct dsys_event *iter = demo->evlist;

350

351 while(iter) {

352 if(strcmp(iter->name, name) == 0) {

353 return iter;

354 }

355 iter = iter->next;

356 }

357 return 0;

358 }

359

360 enum dsys_evtype dsys_event_type(struct dsys_event *ev)

361 {

362 return ev->type;

363 }

364

365 float dsys_event_value(struct dsys_event *ev)

366 {

367 return ev->val;

368 }

369

370 int dsys_event_callback(struct dsys_event *ev, void (*func)(struct dsys_event*, void*), void *cls)

371 {

372 struct callback *cb;

373

374 if(!(cb = malloc(sizeof *cb))) {

375 perror("failed to allocate memory");

376 return -1;

377 }

378 cb->func = func;

379 cb->cls = cls;

380 cb->next = ev->cblist;

381 ev->cblist = cb;

382 return 0;

383 }

384

385 int dsys_event_link(struct dsys_event *ev, float *link)

386 {

387 return dsys_event_callback(ev, link_callback, link);

388 }

389

390 static void link_callback(struct dsys_event *ev, void *cls)

391 {

392 *(float*)cls = ev->val;

393 }

394

395

396 /* time conversion */

397 demotime_t dsys_sec_to_dtime(float sec)

398 {

399 return sec;

400 }

401

402 demotime_t dsys_msec_to_dtime(unsigned long msec)

403 {

404 return (demotime_t)msec / 1000.0;

405 }

406

407 float dsys_dtime_to_sec(demotime_t tm)

408 {

409 return tm;

410 }

411

412 unsigned long dsys_dtime_to_msec(demotime_t tm)

413 {

414 return (unsigned long)(tm * 1000.0);

415 }

416

417

418 float dsys_eval_step(struct dsys_event *ev, demotime_t t)

419 {

420 return t >= ev->t1 ? 1.0 : 0.0;

421 }

422

423 #define CLAMP(x, low, high) ((x) < (low) ? (low) : ((x) > (high) ? (high) : (x)))

424

425 float dsys_eval_lerp(struct dsys_event *ev, demotime_t t)

426 {

427 float res = (t - ev->t0) / (ev->t1 - ev->t0);

428 return CLAMP(res, 0.0, 1.0);

429 }

430

431 float dsys_eval_sigmoid(struct dsys_event *ev, demotime_t t)

432 {

433 t = dsys_eval_lerp(ev, t);

434 return 1.0 - (cos(t * M_PI) * 0.5 + 0.5);

435 }

436

437 static void free_event(struct dsys_event *ev)

438 {

439 while(ev->cblist) {

440 struct callback *cb = ev->cblist;

441 ev->cblist = ev->cblist->next;

442 free(cb);

443 }

444 }

445

446 static struct dsys_event *sort_evlist(struct dsys_event *list, int num_ev)

447 {

448 int i, num_left, num_right;

449 struct dsys_event *left, *right, *node = list;

450

451 if(num_ev < 2) {

452 return list;

453 }

454

455 num_left = num_ev / 2;

456 num_right = num_ev - num_left;

457

458 for(i=0; i<num_ev/2; i++) {

459 node = node->next;

460 }

461

462 if(node->prev) {

463 node->prev->next = 0;

464 node->prev = 0;

465 }

466

467 left = sort_evlist(list, num_left);

468 right = sort_evlist(node, num_right);

469

470 return merge_evlists(left, right);

471 }

472

473 static struct dsys_event *merge_evlists(struct dsys_event *list1, struct dsys_event *list2)

474 {

475 struct dsys_event *head, *tail, *node;

476

477 if(!list1) {

478 return list2;

479 }

480 if(!list2) {

481 return list1;

482 }

483

484 head = tail = 0;

485

486 while(list1 && list2) {

487 if(list1->t0 < list2->t0) {

488 node = list1;

489 list1 = list1->next;

490 } else {

491 node = list2;

492 list2 = list2->next;

493 }

494

495 node->next = 0;

496 node->prev = tail;

497

498 if(!head) {

499 head = node;

500 } else {

501 tail->next = node;

502 }

503 tail = node;

504 }

505

506 if(list1) {

507 tail->next = list1;

508 list1->prev = tail;

509 } else if(list2) {

510 tail->next = list2;

511 list2->prev = tail;

512 }

513

514 return head;

515 }