src/platform/libretro/libretro.c (view raw)
1/* Copyright (c) 2013-2015 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 "libretro.h"
7
8#include <mgba-util/common.h>
9
10#include <mgba/core/blip_buf.h>
11#include <mgba/core/cheats.h>
12#include <mgba/core/core.h>
13#include <mgba/core/log.h>
14#include <mgba/core/version.h>
15#ifdef M_CORE_GB
16#include <mgba/gb/core.h>
17#include <mgba/internal/gb/gb.h>
18#endif
19#ifdef M_CORE_GBA
20#include <mgba/gba/core.h>
21#include <mgba/gba/interface.h>
22#include <mgba/internal/gba/gba.h>
23#endif
24#include <mgba-util/circle-buffer.h>
25#include <mgba-util/memory.h>
26#include <mgba-util/vfs.h>
27
28#define SAMPLES 1024
29#define RUMBLE_PWM 35
30
31static retro_environment_t environCallback;
32static retro_video_refresh_t videoCallback;
33static retro_audio_sample_batch_t audioCallback;
34static retro_input_poll_t inputPollCallback;
35static retro_input_state_t inputCallback;
36static retro_log_printf_t logCallback;
37static retro_set_rumble_state_t rumbleCallback;
38
39static void GBARetroLog(struct mLogger* logger, int category, enum mLogLevel level, const char* format, va_list args);
40
41static void _postAudioBuffer(struct mAVStream*, blip_t* left, blip_t* right);
42static void _setRumble(struct mRumble* rumble, int enable);
43static uint8_t _readLux(struct GBALuminanceSource* lux);
44static void _updateLux(struct GBALuminanceSource* lux);
45
46static struct mCore* core;
47static void* outputBuffer;
48static void* data;
49static size_t dataSize;
50static void* savedata;
51static struct mAVStream stream;
52static int rumbleLevel;
53static struct CircleBuffer rumbleHistory;
54static struct mRumble rumble;
55static struct GBALuminanceSource lux;
56static int luxLevel;
57static struct mLogger logger;
58
59static void _reloadSettings(void) {
60 struct mCoreOptions opts = {
61 .useBios = true,
62 .volume = 0x100,
63 };
64
65 struct retro_variable var;
66 enum GBModel model;
67 const char* modelName;
68
69 var.key = "mgba_model";
70 var.value = 0;
71 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
72 if (strcmp(var.value, "Game Boy") == 0) {
73 model = GB_MODEL_DMG;
74 } else if (strcmp(var.value, "Super Game Boy") == 0) {
75 model = GB_MODEL_SGB;
76 } else if (strcmp(var.value, "Game Boy Color") == 0) {
77 model = GB_MODEL_CGB;
78 } else {
79 model = GB_MODEL_AUTODETECT;
80 }
81
82 modelName = GBModelToName(model);
83 mCoreConfigSetDefaultValue(&core->config, "gb.model", modelName);
84 mCoreConfigSetDefaultValue(&core->config, "sgb.model", modelName);
85 mCoreConfigSetDefaultValue(&core->config, "cgb.model", modelName);
86 }
87
88 var.key = "mgba_use_bios";
89 var.value = 0;
90 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
91 opts.useBios = strcmp(var.value, "ON") == 0;
92 }
93
94 var.key = "mgba_skip_bios";
95 var.value = 0;
96 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
97 opts.skipBios = strcmp(var.value, "ON") == 0;
98 }
99
100 var.key = "mgba_sgb_borders";
101 var.value = 0;
102 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
103 if (strcmp(var.value, "ON") == 0) {
104 mCoreConfigSetDefaultIntValue(&core->config, "sgb.borders", true);
105 } else {
106 mCoreConfigSetDefaultIntValue(&core->config, "sgb.borders", false);
107 }
108 }
109
110 var.key = "mgba_idle_optimization";
111 var.value = 0;
112 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
113 if (strcmp(var.value, "Don't Remove") == 0) {
114 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "ignore");
115 } else if (strcmp(var.value, "Remove Known") == 0) {
116 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "remove");
117 } else if (strcmp(var.value, "Detect and Remove") == 0) {
118 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "detect");
119 }
120 }
121
122 var.key = "mgba_frameskip";
123 var.value = 0;
124 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
125 opts.frameskip = strtol(var.value, NULL, 10);
126
127 }
128
129 mCoreConfigLoadDefaults(&core->config, &opts);
130 mCoreLoadConfig(core);
131}
132
133unsigned retro_api_version(void) {
134 return RETRO_API_VERSION;
135}
136
137void retro_set_environment(retro_environment_t env) {
138 environCallback = env;
139
140 struct retro_variable vars[] = {
141 { "mgba_solar_sensor_level", "Solar sensor level; 0|1|2|3|4|5|6|7|8|9|10" },
142 { "mgba_allow_opposing_directions", "Allow opposing directional input; OFF|ON" },
143 { "mgba_model", "Game Boy model (requires restart); Autodetect|Game Boy|Super Game Boy|Game Boy Color" },
144 { "mgba_use_bios", "Use BIOS file if found (requires restart); ON|OFF" },
145 { "mgba_skip_bios", "Skip BIOS intro (requires restart); OFF|ON" },
146 { "mgba_sgb_borders", "Use Super Game Boy borders (requires restart); ON|OFF" },
147 { "mgba_idle_optimization", "Idle loop removal; Remove Known|Detect and Remove|Don't Remove" },
148 { "mgba_frameskip", "Frameskip; 0|1|2|3|4|5|6|7|8|9|10" },
149 { 0, 0 }
150 };
151
152 environCallback(RETRO_ENVIRONMENT_SET_VARIABLES, vars);
153}
154
155void retro_set_video_refresh(retro_video_refresh_t video) {
156 videoCallback = video;
157}
158
159void retro_set_audio_sample(retro_audio_sample_t audio) {
160 UNUSED(audio);
161}
162
163void retro_set_audio_sample_batch(retro_audio_sample_batch_t audioBatch) {
164 audioCallback = audioBatch;
165}
166
167void retro_set_input_poll(retro_input_poll_t inputPoll) {
168 inputPollCallback = inputPoll;
169}
170
171void retro_set_input_state(retro_input_state_t input) {
172 inputCallback = input;
173}
174
175void retro_get_system_info(struct retro_system_info* info) {
176 info->need_fullpath = false;
177 info->valid_extensions = "gba|gb|gbc";
178 info->library_version = projectVersion;
179 info->library_name = projectName;
180 info->block_extract = false;
181}
182
183void retro_get_system_av_info(struct retro_system_av_info* info) {
184 unsigned width, height;
185 core->desiredVideoDimensions(core, &width, &height);
186 info->geometry.base_width = width;
187 info->geometry.base_height = height;
188 info->geometry.max_width = width;
189 info->geometry.max_height = height;
190 info->geometry.aspect_ratio = width / (double) height;
191 info->timing.fps = core->frequency(core) / (float) core->frameCycles(core);
192 info->timing.sample_rate = 32768;
193}
194
195void retro_init(void) {
196 enum retro_pixel_format fmt;
197#ifdef COLOR_16_BIT
198#ifdef COLOR_5_6_5
199 fmt = RETRO_PIXEL_FORMAT_RGB565;
200#else
201#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
202 fmt = RETRO_PIXEL_FORMAT_0RGB1555;
203#endif
204#else
205#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
206 fmt = RETRO_PIXEL_FORMAT_XRGB8888;
207#endif
208 environCallback(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt);
209
210 struct retro_input_descriptor inputDescriptors[] = {
211 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "A" },
212 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
213 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT, "Select" },
214 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
215 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
216 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
217 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
218 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
219 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "R" },
220 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "L" },
221 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3, "Brighten Solar Sensor" },
222 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3, "Darken Solar Sensor" },
223 { 0 }
224 };
225 environCallback(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, &inputDescriptors);
226
227 // TODO: RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME when BIOS booting is supported
228
229 struct retro_rumble_interface rumbleInterface;
230 if (environCallback(RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE, &rumbleInterface)) {
231 rumbleCallback = rumbleInterface.set_rumble_state;
232 CircleBufferInit(&rumbleHistory, RUMBLE_PWM);
233 rumble.setRumble = _setRumble;
234 } else {
235 rumbleCallback = 0;
236 }
237
238 luxLevel = 0;
239 lux.readLuminance = _readLux;
240 lux.sample = _updateLux;
241 _updateLux(&lux);
242
243 struct retro_log_callback log;
244 if (environCallback(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log)) {
245 logCallback = log.log;
246 } else {
247 logCallback = 0;
248 }
249 logger.log = GBARetroLog;
250 mLogSetDefaultLogger(&logger);
251
252 stream.videoDimensionsChanged = 0;
253 stream.postAudioFrame = 0;
254 stream.postAudioBuffer = _postAudioBuffer;
255 stream.postVideoFrame = 0;
256}
257
258void retro_deinit(void) {
259 free(outputBuffer);
260}
261
262void retro_run(void) {
263 uint16_t keys;
264 inputPollCallback();
265
266 bool updated = false;
267 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated) {
268 struct retro_variable var = {
269 .key = "mgba_allow_opposing_directions",
270 .value = 0
271 };
272 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
273 ((struct GBA*) core->board)->allowOpposingDirections = strcmp(var.value, "yes") == 0;
274 }
275
276 var.key = "mgba_frameskip";
277 var.value = 0;
278 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
279 mCoreConfigSetUIntValue(&core->config, "frameskip", strtol(var.value, NULL, 10));
280 mCoreLoadConfig(core);
281 }
282 }
283
284 keys = 0;
285 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A)) << 0;
286 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B)) << 1;
287 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT)) << 2;
288 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START)) << 3;
289 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT)) << 4;
290 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT)) << 5;
291 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP)) << 6;
292 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN)) << 7;
293 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R)) << 8;
294 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L)) << 9;
295 core->setKeys(core, keys);
296
297 static bool wasAdjustingLux = false;
298 if (wasAdjustingLux) {
299 wasAdjustingLux = inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3) ||
300 inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3);
301 } else {
302 if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3)) {
303 ++luxLevel;
304 if (luxLevel > 10) {
305 luxLevel = 10;
306 }
307 wasAdjustingLux = true;
308 } else if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3)) {
309 --luxLevel;
310 if (luxLevel < 0) {
311 luxLevel = 0;
312 }
313 wasAdjustingLux = true;
314 }
315 }
316
317 core->runFrame(core);
318 unsigned width, height;
319 core->desiredVideoDimensions(core, &width, &height);
320 videoCallback(outputBuffer, width, height, BYTES_PER_PIXEL * 256);
321}
322
323void static _setupMaps(struct mCore* core) {
324#ifdef M_CORE_GBA
325 if (core->platform(core) == PLATFORM_GBA) {
326 struct GBA* gba = core->board;
327 struct retro_memory_descriptor descs[11];
328 struct retro_memory_map mmaps;
329 size_t romSize = gba->memory.romSize + (gba->memory.romSize & 1);
330
331 memset(descs, 0, sizeof(descs));
332 size_t savedataSize = retro_get_memory_size(RETRO_MEMORY_SAVE_RAM);
333
334 /* Map internal working RAM */
335 descs[0].ptr = gba->memory.iwram;
336 descs[0].start = BASE_WORKING_IRAM;
337 descs[0].len = SIZE_WORKING_IRAM;
338 descs[0].select = 0xFF000000;
339
340 /* Map working RAM */
341 descs[1].ptr = gba->memory.wram;
342 descs[1].start = BASE_WORKING_RAM;
343 descs[1].len = SIZE_WORKING_RAM;
344 descs[1].select = 0xFF000000;
345
346 /* Map save RAM */
347 /* TODO: if SRAM is flash, use start=0 addrspace="S" instead */
348 descs[2].ptr = savedataSize ? savedata : NULL;
349 descs[2].start = BASE_CART_SRAM;
350 descs[2].len = savedataSize;
351
352 /* Map ROM */
353 descs[3].ptr = gba->memory.rom;
354 descs[3].start = BASE_CART0;
355 descs[3].len = romSize;
356 descs[3].flags = RETRO_MEMDESC_CONST;
357
358 descs[4].ptr = gba->memory.rom;
359 descs[4].start = BASE_CART1;
360 descs[4].len = romSize;
361 descs[4].flags = RETRO_MEMDESC_CONST;
362
363 descs[5].ptr = gba->memory.rom;
364 descs[5].start = BASE_CART2;
365 descs[5].len = romSize;
366 descs[5].flags = RETRO_MEMDESC_CONST;
367
368 /* Map BIOS */
369 descs[6].ptr = gba->memory.bios;
370 descs[6].start = BASE_BIOS;
371 descs[6].len = SIZE_BIOS;
372 descs[6].flags = RETRO_MEMDESC_CONST;
373
374 /* Map VRAM */
375 descs[7].ptr = gba->video.vram;
376 descs[7].start = BASE_VRAM;
377 descs[7].len = SIZE_VRAM;
378 descs[7].select = 0xFF000000;
379
380 /* Map palette RAM */
381 descs[8].ptr = gba->video.palette;
382 descs[8].start = BASE_PALETTE_RAM;
383 descs[8].len = SIZE_PALETTE_RAM;
384 descs[8].select = 0xFF000000;
385
386 /* Map OAM */
387 descs[9].ptr = &gba->video.oam; /* video.oam is a structure */
388 descs[9].start = BASE_OAM;
389 descs[9].len = SIZE_OAM;
390 descs[9].select = 0xFF000000;
391
392 /* Map mmapped I/O */
393 descs[10].ptr = gba->memory.io;
394 descs[10].start = BASE_IO;
395 descs[10].len = SIZE_IO;
396
397 mmaps.descriptors = descs;
398 mmaps.num_descriptors = sizeof(descs) / sizeof(descs[0]);
399
400 bool yes = true;
401 environCallback(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &mmaps);
402 environCallback(RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS, &yes);
403 }
404#endif
405}
406
407void retro_reset(void) {
408 core->reset(core);
409 _setupMaps(core);
410
411 if (rumbleCallback) {
412 CircleBufferClear(&rumbleHistory);
413 }
414}
415
416bool retro_load_game(const struct retro_game_info* game) {
417 struct VFile* rom;
418 if (game->data) {
419 data = anonymousMemoryMap(game->size);
420 dataSize = game->size;
421 memcpy(data, game->data, game->size);
422 rom = VFileFromMemory(data, game->size);
423 } else {
424 data = 0;
425 rom = VFileOpen(game->path, O_RDONLY);
426 }
427 if (!rom) {
428 return false;
429 }
430
431 core = mCoreFindVF(rom);
432 if (!core) {
433 rom->close(rom);
434 mappedMemoryFree(data, game->size);
435 return false;
436 }
437 mCoreInitConfig(core, NULL);
438 core->init(core);
439 core->setAVStream(core, &stream);
440
441 outputBuffer = malloc(256 * 224 * BYTES_PER_PIXEL);
442 core->setVideoBuffer(core, outputBuffer, 256);
443
444 core->setAudioBufferSize(core, SAMPLES);
445
446 blip_set_rates(core->getAudioChannel(core, 0), core->frequency(core), 32768);
447 blip_set_rates(core->getAudioChannel(core, 1), core->frequency(core), 32768);
448
449 core->setPeripheral(core, mPERIPH_RUMBLE, &rumble);
450
451 savedata = anonymousMemoryMap(SIZE_CART_FLASH1M);
452 struct VFile* save = VFileFromMemory(savedata, SIZE_CART_FLASH1M);
453
454 _reloadSettings();
455 core->loadROM(core, rom);
456 core->loadSave(core, save);
457
458 const char* sysDir = 0;
459 const char* biosName = 0;
460 char biosPath[PATH_MAX];
461 environCallback(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &sysDir);
462
463#ifdef M_CORE_GBA
464 if (core->platform(core) == PLATFORM_GBA) {
465 core->setPeripheral(core, mPERIPH_GBA_LUMINANCE, &lux);
466 biosName = "gba_bios.bin";
467
468 }
469#endif
470
471#ifdef M_CORE_GB
472 if (core->platform(core) == PLATFORM_GB) {
473 const char* modelName = mCoreConfigGetValue(&core->config, "gb.model");
474 struct GB* gb = core->board;
475
476 if (modelName) {
477 gb->model = GBNameToModel(modelName);
478 } else {
479 GBDetectModel(gb);
480 }
481
482 switch (gb->model) {
483 case GB_MODEL_CGB:
484 biosName = "gbc_bios.bin";
485 break;
486 case GB_MODEL_SGB:
487 biosName = "sgb_bios.bin";
488 break;
489 case GB_MODEL_DMG:
490 default:
491 biosName = "gb_bios.bin";
492 break;
493 };
494 }
495#endif
496
497 if (core->opts.useBios && sysDir && biosName) {
498 snprintf(biosPath, sizeof(biosPath), "%s%s%s", sysDir, PATH_SEP, biosName);
499 struct VFile* bios = VFileOpen(biosPath, O_RDONLY);
500 if (bios) {
501 core->loadBIOS(core, bios, 0);
502 }
503 }
504
505 core->reset(core);
506 _setupMaps(core);
507
508 return true;
509}
510
511void retro_unload_game(void) {
512 if (!core) {
513 return;
514 }
515 core->deinit(core);
516 mappedMemoryFree(data, dataSize);
517 data = 0;
518 mappedMemoryFree(savedata, SIZE_CART_FLASH1M);
519 savedata = 0;
520 CircleBufferDeinit(&rumbleHistory);
521}
522
523size_t retro_serialize_size(void) {
524 return core->stateSize(core);
525}
526
527bool retro_serialize(void* data, size_t size) {
528 if (size != retro_serialize_size()) {
529 return false;
530 }
531 core->saveState(core, data);
532 return true;
533}
534
535bool retro_unserialize(const void* data, size_t size) {
536 if (size != retro_serialize_size()) {
537 return false;
538 }
539 core->loadState(core, data);
540 return true;
541}
542
543void retro_cheat_reset(void) {
544 mCheatDeviceClear(core->cheatDevice(core));
545}
546
547void retro_cheat_set(unsigned index, bool enabled, const char* code) {
548 UNUSED(index);
549 UNUSED(enabled);
550 struct mCheatDevice* device = core->cheatDevice(core);
551 struct mCheatSet* cheatSet = NULL;
552 if (mCheatSetsSize(&device->cheats)) {
553 cheatSet = *mCheatSetsGetPointer(&device->cheats, 0);
554 } else {
555 cheatSet = device->createSet(device, NULL);
556 mCheatAddSet(device, cheatSet);
557 }
558 // Convert the super wonky unportable libretro format to something normal
559 char realCode[] = "XXXXXXXX XXXXXXXX";
560 size_t len = strlen(code) + 1; // Include null terminator
561 size_t i, pos;
562 for (i = 0, pos = 0; i < len; ++i) {
563 if (isspace((int) code[i]) || code[i] == '+') {
564 realCode[pos] = ' ';
565 } else {
566 realCode[pos] = code[i];
567 }
568 if ((pos == 13 && (realCode[pos] == ' ' || !realCode[pos])) || pos == 17) {
569 realCode[pos] = '\0';
570 mCheatAddLine(cheatSet, realCode, 0);
571 pos = 0;
572 continue;
573 }
574 ++pos;
575 }
576}
577
578unsigned retro_get_region(void) {
579 return RETRO_REGION_NTSC; // TODO: This isn't strictly true
580}
581
582void retro_set_controller_port_device(unsigned port, unsigned device) {
583 UNUSED(port);
584 UNUSED(device);
585}
586
587bool retro_load_game_special(unsigned game_type, const struct retro_game_info* info, size_t num_info) {
588 UNUSED(game_type);
589 UNUSED(info);
590 UNUSED(num_info);
591 return false;
592}
593
594void* retro_get_memory_data(unsigned id) {
595 if (id != RETRO_MEMORY_SAVE_RAM) {
596 return 0;
597 }
598 return savedata;
599}
600
601size_t retro_get_memory_size(unsigned id) {
602 if (id != RETRO_MEMORY_SAVE_RAM) {
603 return 0;
604 }
605#ifdef M_CORE_GBA
606 if (core->platform(core) == PLATFORM_GBA) {
607 switch (((struct GBA*) core->board)->memory.savedata.type) {
608 case SAVEDATA_AUTODETECT:
609 return SIZE_CART_FLASH1M;
610 default:
611 return GBASavedataSize(&((struct GBA*) core->board)->memory.savedata);
612 }
613 }
614#endif
615#ifdef M_CORE_GB
616 if (core->platform(core) == PLATFORM_GB) {
617 return ((struct GB*) core->board)->sramSize;
618 }
619#endif
620 return 0;
621}
622
623void GBARetroLog(struct mLogger* logger, int category, enum mLogLevel level, const char* format, va_list args) {
624 UNUSED(logger);
625 if (!logCallback) {
626 return;
627 }
628
629 char message[128];
630 vsnprintf(message, sizeof(message), format, args);
631
632 enum retro_log_level retroLevel = RETRO_LOG_INFO;
633 switch (level) {
634 case mLOG_ERROR:
635 case mLOG_FATAL:
636 retroLevel = RETRO_LOG_ERROR;
637 break;
638 case mLOG_WARN:
639 retroLevel = RETRO_LOG_WARN;
640 break;
641 case mLOG_INFO:
642 retroLevel = RETRO_LOG_INFO;
643 break;
644 case mLOG_GAME_ERROR:
645 case mLOG_STUB:
646#ifdef NDEBUG
647 return;
648#else
649 retroLevel = RETRO_LOG_DEBUG;
650 break;
651#endif
652 case mLOG_DEBUG:
653 retroLevel = RETRO_LOG_DEBUG;
654 break;
655 }
656#ifdef NDEBUG
657 static int biosCat = -1;
658 if (biosCat < 0) {
659 biosCat = mLogCategoryById("gba.bios");
660 }
661
662 if (category == biosCat) {
663 return;
664 }
665#endif
666 logCallback(retroLevel, "%s: %s\n", mLogCategoryName(category), message);
667}
668
669static void _postAudioBuffer(struct mAVStream* stream, blip_t* left, blip_t* right) {
670 UNUSED(stream);
671 int16_t samples[SAMPLES * 2];
672 blip_read_samples(left, samples, SAMPLES, true);
673 blip_read_samples(right, samples + 1, SAMPLES, true);
674 audioCallback(samples, SAMPLES);
675}
676
677static void _setRumble(struct mRumble* rumble, int enable) {
678 UNUSED(rumble);
679 if (!rumbleCallback) {
680 return;
681 }
682 rumbleLevel += enable;
683 if (CircleBufferSize(&rumbleHistory) == RUMBLE_PWM) {
684 int8_t oldLevel;
685 CircleBufferRead8(&rumbleHistory, &oldLevel);
686 rumbleLevel -= oldLevel;
687 }
688 CircleBufferWrite8(&rumbleHistory, enable);
689 rumbleCallback(0, RETRO_RUMBLE_STRONG, rumbleLevel * 0xFFFF / RUMBLE_PWM);
690 rumbleCallback(0, RETRO_RUMBLE_WEAK, rumbleLevel * 0xFFFF / RUMBLE_PWM);
691}
692
693static void _updateLux(struct GBALuminanceSource* lux) {
694 UNUSED(lux);
695 struct retro_variable var = {
696 .key = "mgba_solar_sensor_level",
697 .value = 0
698 };
699
700 bool updated = false;
701 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) || !updated) {
702 return;
703 }
704 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) || !var.value) {
705 return;
706 }
707
708 char* end;
709 int newLuxLevel = strtol(var.value, &end, 10);
710 if (!*end) {
711 if (newLuxLevel > 10) {
712 luxLevel = 10;
713 } else if (newLuxLevel < 0) {
714 luxLevel = 0;
715 } else {
716 luxLevel = newLuxLevel;
717 }
718 }
719}
720
721static uint8_t _readLux(struct GBALuminanceSource* lux) {
722 UNUSED(lux);
723 int value = 0x16;
724 if (luxLevel > 0) {
725 value += GBA_LUX_LEVELS[luxLevel - 1];
726 }
727 return 0xFF - value;
728}