src/gb/gb.c (view raw)
1/* Copyright (c) 2013-2016 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include "gb.h"
7
8#include "gb/io.h"
9#include "gb/mbc.h"
10
11#include "core/core.h"
12#include "core/cheats.h"
13#include "util/crc32.h"
14#include "util/memory.h"
15#include "util/math.h"
16#include "util/patch.h"
17#include "util/vfs.h"
18
19#define CLEANUP_THRESHOLD 15
20
21const uint32_t CGB_LR35902_FREQUENCY = 0x800000;
22const uint32_t SGB_LR35902_FREQUENCY = 0x418B1E;
23
24const uint32_t GB_COMPONENT_MAGIC = 0x400000;
25
26static const uint8_t _knownHeader[4] = { 0xCE, 0xED, 0x66, 0x66};
27
28#define DMG_BIOS_CHECKSUM 0xC2F5CC97
29#define DMG_2_BIOS_CHECKSUM 0x59C8598E
30#define CGB_BIOS_CHECKSUM 0x41884E46
31
32mLOG_DEFINE_CATEGORY(GB, "GB");
33
34static void GBInit(void* cpu, struct mCPUComponent* component);
35static void GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh);
36static void GBProcessEvents(struct LR35902Core* cpu);
37static void GBSetInterrupts(struct LR35902Core* cpu, bool enable);
38static void GBIllegal(struct LR35902Core* cpu);
39static void GBStop(struct LR35902Core* cpu);
40
41#ifdef _3DS
42extern uint32_t* romBuffer;
43extern size_t romBufferSize;
44#endif
45
46void GBCreate(struct GB* gb) {
47 gb->d.id = GB_COMPONENT_MAGIC;
48 gb->d.init = GBInit;
49 gb->d.deinit = 0;
50}
51
52static void GBInit(void* cpu, struct mCPUComponent* component) {
53 struct GB* gb = (struct GB*) component;
54 gb->cpu = cpu;
55 gb->sync = NULL;
56
57 GBInterruptHandlerInit(&gb->cpu->irqh);
58 GBMemoryInit(gb);
59
60 gb->video.p = gb;
61 GBVideoInit(&gb->video);
62
63 gb->audio.p = gb;
64 GBAudioInit(&gb->audio, 2048, &gb->memory.io[REG_NR52], GB_AUDIO_DMG); // TODO: Remove magic constant
65
66 gb->sio.p = gb;
67 GBSIOInit(&gb->sio);
68
69 gb->timer.p = gb;
70
71 gb->model = GB_MODEL_AUTODETECT;
72
73 gb->biosVf = 0;
74 gb->romVf = 0;
75 gb->sramVf = 0;
76
77 gb->pristineRom = 0;
78 gb->pristineRomSize = 0;
79 gb->yankedRomSize = 0;
80
81 gb->coreCallbacks = NULL;
82 gb->stream = NULL;
83}
84
85bool GBLoadROM(struct GB* gb, struct VFile* vf) {
86 if (!vf) {
87 return false;
88 }
89 GBUnloadROM(gb);
90 gb->romVf = vf;
91 gb->pristineRomSize = vf->size(vf);
92 vf->seek(vf, 0, SEEK_SET);
93#ifdef _3DS
94 gb->pristineRom = 0;
95 if (gb->pristineRomSize <= romBufferSize) {
96 gb->pristineRom = romBuffer;
97 vf->read(vf, romBuffer, gb->pristineRomSize);
98 }
99#else
100 gb->pristineRom = vf->map(vf, gb->pristineRomSize, MAP_READ);
101#endif
102 if (!gb->pristineRom) {
103 return false;
104 }
105 gb->yankedRomSize = 0;
106 gb->memory.rom = gb->pristineRom;
107 gb->memory.romBase = gb->memory.rom;
108 gb->memory.romSize = gb->pristineRomSize;
109 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
110
111 if (gb->cpu) {
112 struct LR35902Core* cpu = gb->cpu;
113 cpu->memory.setActiveRegion(cpu, cpu->pc);
114 }
115
116 // TODO: error check
117 return true;
118}
119
120bool GBLoadSave(struct GB* gb, struct VFile* vf) {
121 gb->sramVf = vf;
122 gb->sramRealVf = vf;
123 return vf;
124}
125
126static void GBSramDeinit(struct GB* gb) {
127 if (gb->sramVf) {
128 gb->sramVf->unmap(gb->sramVf, gb->memory.sram, gb->sramSize);
129 if (gb->memory.mbcType == GB_MBC3_RTC && gb->sramVf == gb->sramRealVf) {
130 GBMBCRTCWrite(gb);
131 }
132 gb->sramVf = NULL;
133 } else if (gb->memory.sram) {
134 mappedMemoryFree(gb->memory.sram, gb->sramSize);
135 }
136 gb->memory.sram = 0;
137}
138
139void GBResizeSram(struct GB* gb, size_t size) {
140 if (gb->memory.sram && size <= gb->sramSize) {
141 return;
142 }
143 mLOG(GB, INFO, "Resizing SRAM to %"PRIz"u bytes", size);
144 struct VFile* vf = gb->sramVf;
145 if (vf) {
146 if (vf == gb->sramRealVf) {
147 ssize_t vfSize = vf->size(vf);
148 if (vfSize >= 0 && (size_t) vfSize < size) {
149 uint8_t extdataBuffer[0x100];
150 if (vfSize & 0xFF) {
151 vf->seek(vf, -(vfSize & 0xFF), SEEK_END);
152 vf->read(vf, extdataBuffer, vfSize & 0xFF);
153 }
154 if (gb->memory.sram) {
155 vf->unmap(vf, gb->memory.sram, gb->sramSize);
156 }
157 vf->truncate(vf, size + (vfSize & 0xFF));
158 if (vfSize & 0xFF) {
159 vf->seek(vf, size, SEEK_SET);
160 vf->write(vf, extdataBuffer, vfSize & 0xFF);
161 }
162 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
163 memset(&gb->memory.sram[gb->sramSize], 0xFF, size - gb->sramSize);
164 } else if (size > gb->sramSize || !gb->memory.sram) {
165 if (gb->memory.sram) {
166 vf->unmap(vf, gb->memory.sram, gb->sramSize);
167 }
168 gb->memory.sram = vf->map(vf, size, MAP_WRITE);
169 }
170 } else {
171 if (gb->memory.sram) {
172 vf->unmap(vf, gb->memory.sram, gb->sramSize);
173 }
174 gb->memory.sram = vf->map(vf, size, MAP_READ);
175 }
176 if (gb->memory.sram == (void*) -1) {
177 gb->memory.sram = NULL;
178 }
179 } else {
180 uint8_t* newSram = anonymousMemoryMap(size);
181 if (gb->memory.sram) {
182 if (size > gb->sramSize) {
183 memcpy(newSram, gb->memory.sram, gb->sramSize);
184 memset(&newSram[gb->sramSize], 0xFF, size - gb->sramSize);
185 } else {
186 memcpy(newSram, gb->memory.sram, size);
187 }
188 mappedMemoryFree(gb->memory.sram, gb->sramSize);
189 } else {
190 memset(newSram, 0xFF, size);
191 }
192 gb->memory.sram = newSram;
193 }
194 if (gb->sramSize < size) {
195 gb->sramSize = size;
196 }
197}
198
199void GBSramClean(struct GB* gb, uint32_t frameCount) {
200 // TODO: Share with GBASavedataClean
201 if (!gb->sramVf || gb->sramVf != gb->sramRealVf) {
202 return;
203 }
204 if (gb->sramDirty & GB_SRAM_DIRT_NEW) {
205 gb->sramDirtAge = frameCount;
206 gb->sramDirty &= ~GB_SRAM_DIRT_NEW;
207 if (!(gb->sramDirty & GB_SRAM_DIRT_SEEN)) {
208 gb->sramDirty |= GB_SRAM_DIRT_SEEN;
209 }
210 } else if ((gb->sramDirty & GB_SRAM_DIRT_SEEN) && frameCount - gb->sramDirtAge > CLEANUP_THRESHOLD) {
211 if (gb->memory.mbcType == GB_MBC3_RTC) {
212 GBMBCRTCWrite(gb);
213 }
214 gb->sramDirty = 0;
215 if (gb->memory.sram && gb->sramVf->sync(gb->sramVf, gb->memory.sram, gb->sramSize)) {
216 mLOG(GB_MEM, INFO, "Savedata synced");
217 } else {
218 mLOG(GB_MEM, INFO, "Savedata failed to sync!");
219 }
220 }
221}
222
223void GBSavedataMask(struct GB* gb, struct VFile* vf, bool writeback) {
224 GBSramDeinit(gb);
225 gb->sramVf = vf;
226 gb->sramMaskWriteback = writeback;
227 gb->memory.sram = vf->map(vf, gb->sramSize, MAP_READ);
228}
229
230void GBSavedataUnmask(struct GB* gb) {
231 if (gb->sramVf == gb->sramRealVf) {
232 return;
233 }
234 struct VFile* vf = gb->sramVf;
235 GBSramDeinit(gb);
236 gb->sramVf = gb->sramRealVf;
237 gb->memory.sram = gb->sramVf->map(gb->sramVf, gb->sramSize, MAP_WRITE);
238 if (gb->sramMaskWriteback) {
239 vf->read(vf, gb->memory.sram, gb->sramSize);
240 }
241 vf->close(vf);
242}
243
244void GBUnloadROM(struct GB* gb) {
245 // TODO: Share with GBAUnloadROM
246 if (gb->memory.rom && gb->memory.romBase != gb->memory.rom && gb->memory.romBase != gb->pristineRom) {
247 free(gb->memory.romBase);
248 }
249 if (gb->memory.rom && gb->pristineRom != gb->memory.rom) {
250 if (gb->yankedRomSize) {
251 gb->yankedRomSize = 0;
252 }
253 mappedMemoryFree(gb->memory.rom, GB_SIZE_CART_MAX);
254 gb->memory.rom = gb->pristineRom;
255 }
256 gb->memory.rom = 0;
257
258 if (gb->romVf) {
259#ifndef _3DS
260 gb->romVf->unmap(gb->romVf, gb->pristineRom, gb->pristineRomSize);
261#endif
262 gb->romVf->close(gb->romVf);
263 gb->romVf = 0;
264 }
265 gb->pristineRom = 0;
266
267 GBSavedataUnmask(gb);
268 GBSramDeinit(gb);
269 if (gb->sramRealVf) {
270 gb->sramRealVf->close(gb->sramRealVf);
271 }
272 gb->sramRealVf = NULL;
273 gb->sramVf = NULL;
274}
275
276void GBSynthesizeROM(struct VFile* vf) {
277 if (!vf) {
278 return;
279 }
280 const struct GBCartridge cart = {
281 .logo = { _knownHeader[0], _knownHeader[1], _knownHeader[2], _knownHeader[3]}
282 };
283
284 vf->seek(vf, 0x100, SEEK_SET);
285 vf->write(vf, &cart, sizeof(cart));
286}
287
288void GBLoadBIOS(struct GB* gb, struct VFile* vf) {
289 gb->biosVf = vf;
290}
291
292void GBApplyPatch(struct GB* gb, struct Patch* patch) {
293 size_t patchedSize = patch->outputSize(patch, gb->memory.romSize);
294 if (!patchedSize) {
295 return;
296 }
297 if (patchedSize > GB_SIZE_CART_MAX) {
298 patchedSize = GB_SIZE_CART_MAX;
299 }
300 gb->memory.rom = anonymousMemoryMap(GB_SIZE_CART_MAX);
301 if (!patch->applyPatch(patch, gb->pristineRom, gb->pristineRomSize, gb->memory.rom, patchedSize)) {
302 mappedMemoryFree(gb->memory.rom, patchedSize);
303 gb->memory.rom = gb->pristineRom;
304 return;
305 }
306 gb->memory.romSize = patchedSize;
307 gb->romCrc32 = doCrc32(gb->memory.rom, gb->memory.romSize);
308}
309
310void GBDestroy(struct GB* gb) {
311 GBUnloadROM(gb);
312
313 if (gb->biosVf) {
314 gb->biosVf->close(gb->biosVf);
315 gb->biosVf = 0;
316 }
317
318 GBMemoryDeinit(gb);
319 GBAudioDeinit(&gb->audio);
320 GBVideoDeinit(&gb->video);
321 GBSIODeinit(&gb->sio);
322}
323
324void GBInterruptHandlerInit(struct LR35902InterruptHandler* irqh) {
325 irqh->reset = GBReset;
326 irqh->processEvents = GBProcessEvents;
327 irqh->setInterrupts = GBSetInterrupts;
328 irqh->hitIllegal = GBIllegal;
329 irqh->stop = GBStop;
330 irqh->halt = GBHalt;
331}
332
333static uint32_t _GBBiosCRC32(struct VFile* vf) {
334 ssize_t size = vf->size(vf);
335 if (size <= 0 || size > GB_SIZE_CART_BANK0) {
336 return 0;
337 }
338 void* bios = vf->map(vf, size, MAP_READ);
339 uint32_t biosCrc = doCrc32(bios, size);
340 vf->unmap(vf, bios, size);
341 return biosCrc;
342}
343
344bool GBIsBIOS(struct VFile* vf) {
345 switch (_GBBiosCRC32(vf)) {
346 case DMG_BIOS_CHECKSUM:
347 case DMG_2_BIOS_CHECKSUM:
348 case CGB_BIOS_CHECKSUM:
349 return true;
350 default:
351 return false;
352 }
353}
354
355void GBReset(struct LR35902Core* cpu) {
356 struct GB* gb = (struct GB*) cpu->master;
357 GBDetectModel(gb);
358 if (gb->biosVf) {
359 if (!GBIsBIOS(gb->biosVf)) {
360 gb->biosVf->close(gb->biosVf);
361 gb->biosVf = NULL;
362 } else {
363 gb->biosVf->seek(gb->biosVf, 0, SEEK_SET);
364 gb->memory.romBase = malloc(GB_SIZE_CART_BANK0);
365 ssize_t size = gb->biosVf->read(gb->biosVf, gb->memory.romBase, GB_SIZE_CART_BANK0);
366 memcpy(&gb->memory.romBase[size], &gb->memory.rom[size], GB_SIZE_CART_BANK0 - size);
367 if (size > 0x100) {
368 memcpy(&gb->memory.romBase[0x100], &gb->memory.rom[0x100], sizeof(struct GBCartridge));
369 }
370
371 cpu->a = 0;
372 cpu->f.packed = 0;
373 cpu->c = 0;
374 cpu->e = 0;
375 cpu->h = 0;
376 cpu->l = 0;
377 cpu->sp = 0;
378 cpu->pc = 0;
379 }
380 }
381
382 cpu->b = 0;
383 cpu->d = 0;
384
385 if (!gb->biosVf) {
386 switch (gb->model) {
387 case GB_MODEL_DMG:
388 // TODO: SGB
389 case GB_MODEL_SGB:
390 case GB_MODEL_AUTODETECT: // Silence warnings
391 gb->model = GB_MODEL_DMG;
392 cpu->a = 1;
393 cpu->f.packed = 0xB0;
394 cpu->c = 0x13;
395 cpu->e = 0xD8;
396 cpu->h = 1;
397 cpu->l = 0x4D;
398 break;
399 case GB_MODEL_AGB:
400 cpu->b = 1;
401 // Fall through
402 case GB_MODEL_CGB:
403 cpu->a = 0x11;
404 cpu->f.packed = 0x80;
405 cpu->c = 0;
406 cpu->e = 0x08;
407 cpu->h = 0;
408 cpu->l = 0x7C;
409 break;
410 }
411
412 cpu->sp = 0xFFFE;
413 cpu->pc = 0x100;
414 }
415
416 gb->eiPending = INT_MAX;
417 gb->doubleSpeed = 0;
418
419 cpu->memory.setActiveRegion(cpu, cpu->pc);
420
421 if (gb->yankedRomSize) {
422 gb->memory.romSize = gb->yankedRomSize;
423 gb->yankedRomSize = 0;
424 }
425 GBMemoryReset(gb);
426 GBVideoReset(&gb->video);
427 GBTimerReset(&gb->timer);
428 GBAudioReset(&gb->audio);
429 GBIOReset(gb);
430 GBSIOReset(&gb->sio);
431
432 GBSavedataUnmask(gb);
433}
434
435void GBDetectModel(struct GB* gb) {
436 if (gb->model != GB_MODEL_AUTODETECT) {
437 return;
438 }
439 if (gb->biosVf) {
440 switch (_GBBiosCRC32(gb->biosVf)) {
441 case DMG_BIOS_CHECKSUM:
442 case DMG_2_BIOS_CHECKSUM:
443 gb->model = GB_MODEL_DMG;
444 break;
445 case CGB_BIOS_CHECKSUM:
446 gb->model = GB_MODEL_CGB;
447 break;
448 default:
449 gb->biosVf->close(gb->biosVf);
450 gb->biosVf = NULL;
451 }
452 }
453 if (gb->model == GB_MODEL_AUTODETECT && gb->memory.rom) {
454 const struct GBCartridge* cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
455 if (cart->cgb & 0x80) {
456 gb->model = GB_MODEL_CGB;
457 } else {
458 gb->model = GB_MODEL_DMG;
459 }
460 }
461
462 switch (gb->model) {
463 case GB_MODEL_DMG:
464 case GB_MODEL_SGB:
465 case GB_MODEL_AUTODETECT: //Silence warnings
466 gb->audio.style = GB_AUDIO_DMG;
467 break;
468 case GB_MODEL_AGB:
469 case GB_MODEL_CGB:
470 gb->audio.style = GB_AUDIO_CGB;
471 break;
472 }
473}
474
475void GBUpdateIRQs(struct GB* gb) {
476 int irqs = gb->memory.ie & gb->memory.io[REG_IF];
477 if (!irqs) {
478 return;
479 }
480 gb->cpu->halted = false;
481
482 if (!gb->memory.ime || gb->cpu->irqPending) {
483 return;
484 }
485
486 if (irqs & (1 << GB_IRQ_VBLANK)) {
487 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_VBLANK);
488 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_VBLANK);
489 return;
490 }
491 if (irqs & (1 << GB_IRQ_LCDSTAT)) {
492 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_LCDSTAT);
493 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_LCDSTAT);
494 return;
495 }
496 if (irqs & (1 << GB_IRQ_TIMER)) {
497 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_TIMER);
498 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_TIMER);
499 return;
500 }
501 if (irqs & (1 << GB_IRQ_SIO)) {
502 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_SIO);
503 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_SIO);
504 return;
505 }
506 if (irqs & (1 << GB_IRQ_KEYPAD)) {
507 LR35902RaiseIRQ(gb->cpu, GB_VECTOR_KEYPAD);
508 gb->memory.io[REG_IF] &= ~(1 << GB_IRQ_KEYPAD);
509 }
510}
511
512void GBProcessEvents(struct LR35902Core* cpu) {
513 struct GB* gb = (struct GB*) cpu->master;
514 do {
515 int32_t cycles = cpu->nextEvent;
516 int32_t nextEvent = INT_MAX;
517 int32_t testEvent;
518
519 if (gb->eiPending != INT_MAX) {
520 gb->eiPending -= cycles;
521 if (gb->eiPending <= 0) {
522 gb->memory.ime = true;
523 GBUpdateIRQs(gb);
524 gb->eiPending = INT_MAX;
525 } else {
526 nextEvent = gb->eiPending;
527 }
528 }
529
530 testEvent = GBVideoProcessEvents(&gb->video, cycles >> gb->doubleSpeed);
531 if (testEvent != INT_MAX) {
532 testEvent <<= gb->doubleSpeed;
533 if (testEvent < nextEvent) {
534 nextEvent = testEvent;
535 }
536 }
537
538 testEvent = GBAudioProcessEvents(&gb->audio, cycles >> gb->doubleSpeed);
539 if (testEvent != INT_MAX) {
540 testEvent <<= gb->doubleSpeed;
541 if (testEvent < nextEvent) {
542 nextEvent = testEvent;
543 }
544 }
545
546 testEvent = GBTimerProcessEvents(&gb->timer, cycles);
547 if (testEvent < nextEvent) {
548 nextEvent = testEvent;
549 }
550
551 testEvent = GBSIOProcessEvents(&gb->sio, cycles);
552 if (testEvent < nextEvent) {
553 nextEvent = testEvent;
554 }
555
556 testEvent = GBMemoryProcessEvents(gb, cycles);
557 if (testEvent < nextEvent) {
558 nextEvent = testEvent;
559 }
560
561 cpu->cycles -= cycles;
562 cpu->nextEvent = nextEvent;
563
564 if (cpu->halted) {
565 cpu->cycles = cpu->nextEvent;
566 if (!gb->memory.ie || !gb->memory.ime) {
567 break;
568 }
569 }
570 } while (cpu->cycles >= cpu->nextEvent);
571}
572
573void GBSetInterrupts(struct LR35902Core* cpu, bool enable) {
574 struct GB* gb = (struct GB*) cpu->master;
575 if (!enable) {
576 gb->memory.ime = enable;
577 gb->eiPending = INT_MAX;
578 GBUpdateIRQs(gb);
579 } else {
580 if (cpu->nextEvent > cpu->cycles + 4) {
581 cpu->nextEvent = cpu->cycles + 4;
582 }
583 gb->eiPending = cpu->cycles + 4;
584 }
585}
586
587void GBHalt(struct LR35902Core* cpu) {
588 if (!cpu->irqPending) {
589 cpu->cycles = cpu->nextEvent;
590 cpu->halted = true;
591 }
592}
593
594void GBStop(struct LR35902Core* cpu) {
595 struct GB* gb = (struct GB*) cpu->master;
596 if (cpu->bus) {
597 mLOG(GB, GAME_ERROR, "Hit illegal stop at address %04X:%02X\n", cpu->pc, cpu->bus);
598 }
599 if (gb->memory.io[REG_KEY1] & 1) {
600 gb->doubleSpeed ^= 1;
601 gb->memory.io[REG_KEY1] = 0;
602 gb->memory.io[REG_KEY1] |= gb->doubleSpeed << 7;
603 } else if (cpu->bus) {
604#ifdef USE_DEBUGGERS
605 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
606 struct mDebuggerEntryInfo info = {
607 .address = cpu->pc - 1,
608 .opcode = 0x1000 | cpu->bus
609 };
610 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
611 }
612#endif
613 // Hang forever
614 gb->memory.ime = 0;
615 cpu->pc -= 2;
616 }
617 // TODO: Actually stop
618}
619
620void GBIllegal(struct LR35902Core* cpu) {
621 struct GB* gb = (struct GB*) cpu->master;
622 mLOG(GB, GAME_ERROR, "Hit illegal opcode at address %04X:%02X\n", cpu->pc, cpu->bus);
623#ifdef USE_DEBUGGERS
624 if (cpu->components && cpu->components[CPU_COMPONENT_DEBUGGER]) {
625 struct mDebuggerEntryInfo info = {
626 .address = cpu->pc,
627 .opcode = cpu->bus
628 };
629 mDebuggerEnter((struct mDebugger*) cpu->components[CPU_COMPONENT_DEBUGGER], DEBUGGER_ENTER_ILLEGAL_OP, &info);
630 }
631#endif
632 // Hang forever
633 gb->memory.ime = 0;
634 --cpu->pc;
635}
636
637bool GBIsROM(struct VFile* vf) {
638 vf->seek(vf, 0x104, SEEK_SET);
639 uint8_t header[4];
640
641 if (vf->read(vf, &header, sizeof(header)) < (ssize_t) sizeof(header)) {
642 return false;
643 }
644 if (memcmp(header, _knownHeader, sizeof(header))) {
645 return false;
646 }
647 return true;
648}
649
650void GBGetGameTitle(const struct GB* gb, char* out) {
651 const struct GBCartridge* cart = NULL;
652 if (gb->memory.rom) {
653 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
654 }
655 if (gb->pristineRom) {
656 cart = (const struct GBCartridge*) &((uint8_t*) gb->pristineRom)[0x100];
657 }
658 if (!cart) {
659 return;
660 }
661 if (cart->oldLicensee != 0x33) {
662 memcpy(out, cart->titleLong, 16);
663 } else {
664 memcpy(out, cart->titleShort, 11);
665 }
666}
667
668void GBGetGameCode(const struct GB* gb, char* out) {
669 memset(out, 0, 8);
670 const struct GBCartridge* cart = NULL;
671 if (gb->memory.rom) {
672 cart = (const struct GBCartridge*) &gb->memory.rom[0x100];
673 }
674 if (gb->pristineRom) {
675 cart = (const struct GBCartridge*) &((uint8_t*) gb->pristineRom)[0x100];
676 }
677 if (!cart) {
678 return;
679 }
680 if (cart->cgb == 0xC0) {
681 memcpy(out, "CGB-????", 8);
682 } else {
683 memcpy(out, "DMG-????", 8);
684 }
685 if (cart->oldLicensee == 0x33) {
686 memcpy(&out[4], cart->maker, 4);
687 }
688}
689
690void GBFrameEnded(struct GB* gb) {
691 GBSramClean(gb, gb->video.frameCounter);
692
693 if (gb->cpu->components && gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE]) {
694 struct mCheatDevice* device = (struct mCheatDevice*) gb->cpu->components[CPU_COMPONENT_CHEAT_DEVICE];
695 size_t i;
696 for (i = 0; i < mCheatSetsSize(&device->cheats); ++i) {
697 struct mCheatSet* cheats = *mCheatSetsGetPointer(&device->cheats, i);
698 mCheatRefresh(device, cheats);
699 }
700 }
701}