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_gb_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 if (strcmp(var.value, "Game Boy Advance") == 0) {
79 model = GB_MODEL_AGB;
80 } else {
81 model = GB_MODEL_AUTODETECT;
82 }
83
84 modelName = GBModelToName(model);
85 mCoreConfigSetDefaultValue(&core->config, "gb.model", modelName);
86 mCoreConfigSetDefaultValue(&core->config, "sgb.model", modelName);
87 mCoreConfigSetDefaultValue(&core->config, "cgb.model", modelName);
88 }
89
90 var.key = "mgba_use_bios";
91 var.value = 0;
92 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
93 opts.useBios = strcmp(var.value, "ON") == 0;
94 }
95
96 var.key = "mgba_skip_bios";
97 var.value = 0;
98 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
99 opts.skipBios = strcmp(var.value, "ON") == 0;
100 }
101
102 var.key = "mgba_sgb_borders";
103 var.value = 0;
104 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
105 if (strcmp(var.value, "ON") == 0) {
106 mCoreConfigSetDefaultIntValue(&core->config, "sgb.borders", true);
107 } else {
108 mCoreConfigSetDefaultIntValue(&core->config, "sgb.borders", false);
109 }
110 }
111
112 var.key = "mgba_idle_optimization";
113 var.value = 0;
114 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
115 if (strcmp(var.value, "Don't Remove") == 0) {
116 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "ignore");
117 } else if (strcmp(var.value, "Remove Known") == 0) {
118 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "remove");
119 } else if (strcmp(var.value, "Detect and Remove") == 0) {
120 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "detect");
121 }
122 }
123
124 var.key = "mgba_frameskip";
125 var.value = 0;
126 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
127 opts.frameskip = strtol(var.value, NULL, 10);
128
129 }
130
131 mCoreConfigLoadDefaults(&core->config, &opts);
132 mCoreLoadConfig(core);
133}
134
135unsigned retro_api_version(void) {
136 return RETRO_API_VERSION;
137}
138
139void retro_set_environment(retro_environment_t env) {
140 environCallback = env;
141
142 struct retro_variable vars[] = {
143 { "mgba_solar_sensor_level", "Solar sensor level; 0|1|2|3|4|5|6|7|8|9|10" },
144 { "mgba_allow_opposing_directions", "Allow opposing directional input; OFF|ON" },
145 { "mgba_gb_model", "Game Boy model (requires restart); Autodetect|Game Boy|Super Game Boy|Game Boy Color|Game Boy Advance" },
146 { "mgba_use_bios", "Use BIOS file if found (requires restart); ON|OFF" },
147 { "mgba_skip_bios", "Skip BIOS intro (requires restart); OFF|ON" },
148 { "mgba_sgb_borders", "Use Super Game Boy borders (requires restart); ON|OFF" },
149 { "mgba_idle_optimization", "Idle loop removal; Remove Known|Detect and Remove|Don't Remove" },
150 { "mgba_frameskip", "Frameskip; 0|1|2|3|4|5|6|7|8|9|10" },
151 { 0, 0 }
152 };
153
154 environCallback(RETRO_ENVIRONMENT_SET_VARIABLES, vars);
155}
156
157void retro_set_video_refresh(retro_video_refresh_t video) {
158 videoCallback = video;
159}
160
161void retro_set_audio_sample(retro_audio_sample_t audio) {
162 UNUSED(audio);
163}
164
165void retro_set_audio_sample_batch(retro_audio_sample_batch_t audioBatch) {
166 audioCallback = audioBatch;
167}
168
169void retro_set_input_poll(retro_input_poll_t inputPoll) {
170 inputPollCallback = inputPoll;
171}
172
173void retro_set_input_state(retro_input_state_t input) {
174 inputCallback = input;
175}
176
177void retro_get_system_info(struct retro_system_info* info) {
178 info->need_fullpath = false;
179 info->valid_extensions = "gba|gb|gbc";
180 info->library_version = projectVersion;
181 info->library_name = projectName;
182 info->block_extract = false;
183}
184
185void retro_get_system_av_info(struct retro_system_av_info* info) {
186 unsigned width, height;
187 core->desiredVideoDimensions(core, &width, &height);
188 info->geometry.base_width = width;
189 info->geometry.base_height = height;
190 info->geometry.max_width = width;
191 info->geometry.max_height = height;
192 info->geometry.aspect_ratio = width / (double) height;
193 info->timing.fps = core->frequency(core) / (float) core->frameCycles(core);
194 info->timing.sample_rate = 32768;
195}
196
197void retro_init(void) {
198 enum retro_pixel_format fmt;
199#ifdef COLOR_16_BIT
200#ifdef COLOR_5_6_5
201 fmt = RETRO_PIXEL_FORMAT_RGB565;
202#else
203#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
204 fmt = RETRO_PIXEL_FORMAT_0RGB1555;
205#endif
206#else
207#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
208 fmt = RETRO_PIXEL_FORMAT_XRGB8888;
209#endif
210 environCallback(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt);
211
212 struct retro_input_descriptor inputDescriptors[] = {
213 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "A" },
214 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
215 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT, "Select" },
216 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
217 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
218 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
219 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
220 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
221 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "R" },
222 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "L" },
223 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3, "Brighten Solar Sensor" },
224 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3, "Darken Solar Sensor" },
225 { 0 }
226 };
227 environCallback(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, &inputDescriptors);
228
229 // TODO: RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME when BIOS booting is supported
230
231 struct retro_rumble_interface rumbleInterface;
232 if (environCallback(RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE, &rumbleInterface)) {
233 rumbleCallback = rumbleInterface.set_rumble_state;
234 CircleBufferInit(&rumbleHistory, RUMBLE_PWM);
235 rumble.setRumble = _setRumble;
236 } else {
237 rumbleCallback = 0;
238 }
239
240 luxLevel = 0;
241 lux.readLuminance = _readLux;
242 lux.sample = _updateLux;
243 _updateLux(&lux);
244
245 struct retro_log_callback log;
246 if (environCallback(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log)) {
247 logCallback = log.log;
248 } else {
249 logCallback = 0;
250 }
251 logger.log = GBARetroLog;
252 mLogSetDefaultLogger(&logger);
253
254 stream.videoDimensionsChanged = 0;
255 stream.postAudioFrame = 0;
256 stream.postAudioBuffer = _postAudioBuffer;
257 stream.postVideoFrame = 0;
258 stream.videoFrameRateChanged = 0;
259}
260
261void retro_deinit(void) {
262 free(outputBuffer);
263}
264
265void retro_run(void) {
266 uint16_t keys;
267 inputPollCallback();
268
269 bool updated = false;
270 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated) {
271 struct retro_variable var = {
272 .key = "mgba_allow_opposing_directions",
273 .value = 0
274 };
275 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
276 ((struct GBA*) core->board)->allowOpposingDirections = strcmp(var.value, "yes") == 0;
277 }
278
279 var.key = "mgba_frameskip";
280 var.value = 0;
281 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
282 mCoreConfigSetUIntValue(&core->config, "frameskip", strtol(var.value, NULL, 10));
283 mCoreLoadConfig(core);
284 }
285 }
286
287 keys = 0;
288 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A)) << 0;
289 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B)) << 1;
290 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT)) << 2;
291 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START)) << 3;
292 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT)) << 4;
293 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT)) << 5;
294 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP)) << 6;
295 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN)) << 7;
296 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R)) << 8;
297 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L)) << 9;
298 core->setKeys(core, keys);
299
300 static bool wasAdjustingLux = false;
301 if (wasAdjustingLux) {
302 wasAdjustingLux = inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3) ||
303 inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3);
304 } else {
305 if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3)) {
306 ++luxLevel;
307 if (luxLevel > 10) {
308 luxLevel = 10;
309 }
310 wasAdjustingLux = true;
311 } else if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3)) {
312 --luxLevel;
313 if (luxLevel < 0) {
314 luxLevel = 0;
315 }
316 wasAdjustingLux = true;
317 }
318 }
319
320 core->runFrame(core);
321 unsigned width, height;
322 core->desiredVideoDimensions(core, &width, &height);
323 videoCallback(outputBuffer, width, height, BYTES_PER_PIXEL * 256);
324}
325
326static void _setupMaps(struct mCore* core) {
327#ifdef M_CORE_GBA
328 if (core->platform(core) == PLATFORM_GBA) {
329 struct GBA* gba = core->board;
330 struct retro_memory_descriptor descs[11];
331 struct retro_memory_map mmaps;
332 size_t romSize = gba->memory.romSize + (gba->memory.romSize & 1);
333
334 memset(descs, 0, sizeof(descs));
335 size_t savedataSize = retro_get_memory_size(RETRO_MEMORY_SAVE_RAM);
336
337 /* Map internal working RAM */
338 descs[0].ptr = gba->memory.iwram;
339 descs[0].start = BASE_WORKING_IRAM;
340 descs[0].len = SIZE_WORKING_IRAM;
341 descs[0].select = 0xFF000000;
342
343 /* Map working RAM */
344 descs[1].ptr = gba->memory.wram;
345 descs[1].start = BASE_WORKING_RAM;
346 descs[1].len = SIZE_WORKING_RAM;
347 descs[1].select = 0xFF000000;
348
349 /* Map save RAM */
350 /* TODO: if SRAM is flash, use start=0 addrspace="S" instead */
351 descs[2].ptr = savedataSize ? savedata : NULL;
352 descs[2].start = BASE_CART_SRAM;
353 descs[2].len = savedataSize;
354
355 /* Map ROM */
356 descs[3].ptr = gba->memory.rom;
357 descs[3].start = BASE_CART0;
358 descs[3].len = romSize;
359 descs[3].flags = RETRO_MEMDESC_CONST;
360
361 descs[4].ptr = gba->memory.rom;
362 descs[4].start = BASE_CART1;
363 descs[4].len = romSize;
364 descs[4].flags = RETRO_MEMDESC_CONST;
365
366 descs[5].ptr = gba->memory.rom;
367 descs[5].start = BASE_CART2;
368 descs[5].len = romSize;
369 descs[5].flags = RETRO_MEMDESC_CONST;
370
371 /* Map BIOS */
372 descs[6].ptr = gba->memory.bios;
373 descs[6].start = BASE_BIOS;
374 descs[6].len = SIZE_BIOS;
375 descs[6].flags = RETRO_MEMDESC_CONST;
376
377 /* Map VRAM */
378 descs[7].ptr = gba->video.vram;
379 descs[7].start = BASE_VRAM;
380 descs[7].len = SIZE_VRAM;
381 descs[7].select = 0xFF000000;
382
383 /* Map palette RAM */
384 descs[8].ptr = gba->video.palette;
385 descs[8].start = BASE_PALETTE_RAM;
386 descs[8].len = SIZE_PALETTE_RAM;
387 descs[8].select = 0xFF000000;
388
389 /* Map OAM */
390 descs[9].ptr = &gba->video.oam; /* video.oam is a structure */
391 descs[9].start = BASE_OAM;
392 descs[9].len = SIZE_OAM;
393 descs[9].select = 0xFF000000;
394
395 /* Map mmapped I/O */
396 descs[10].ptr = gba->memory.io;
397 descs[10].start = BASE_IO;
398 descs[10].len = SIZE_IO;
399
400 mmaps.descriptors = descs;
401 mmaps.num_descriptors = sizeof(descs) / sizeof(descs[0]);
402
403 bool yes = true;
404 environCallback(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &mmaps);
405 environCallback(RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS, &yes);
406 }
407#endif
408}
409
410void retro_reset(void) {
411 core->reset(core);
412 _setupMaps(core);
413
414 if (rumbleCallback) {
415 CircleBufferClear(&rumbleHistory);
416 }
417}
418
419bool retro_load_game(const struct retro_game_info* game) {
420 struct VFile* rom;
421 if (game->data) {
422 data = anonymousMemoryMap(game->size);
423 dataSize = game->size;
424 memcpy(data, game->data, game->size);
425 rom = VFileFromMemory(data, game->size);
426 } else {
427 data = 0;
428 rom = VFileOpen(game->path, O_RDONLY);
429 }
430 if (!rom) {
431 return false;
432 }
433
434 core = mCoreFindVF(rom);
435 if (!core) {
436 rom->close(rom);
437 mappedMemoryFree(data, game->size);
438 return false;
439 }
440 mCoreInitConfig(core, NULL);
441 core->init(core);
442 core->setAVStream(core, &stream);
443
444 size_t size = 256 * 224 * BYTES_PER_PIXEL;
445 outputBuffer = malloc(size);
446 memset(outputBuffer, 0xFF, size);
447 core->setVideoBuffer(core, outputBuffer, 256);
448
449 core->setAudioBufferSize(core, SAMPLES);
450
451 blip_set_rates(core->getAudioChannel(core, 0), core->frequency(core), 32768);
452 blip_set_rates(core->getAudioChannel(core, 1), core->frequency(core), 32768);
453
454 core->setPeripheral(core, mPERIPH_RUMBLE, &rumble);
455
456 savedata = anonymousMemoryMap(SIZE_CART_FLASH1M);
457 struct VFile* save = VFileFromMemory(savedata, SIZE_CART_FLASH1M);
458
459 _reloadSettings();
460 core->loadROM(core, rom);
461 core->loadSave(core, save);
462
463 const char* sysDir = 0;
464 const char* biosName = 0;
465 char biosPath[PATH_MAX];
466 environCallback(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &sysDir);
467
468#ifdef M_CORE_GBA
469 if (core->platform(core) == PLATFORM_GBA) {
470 core->setPeripheral(core, mPERIPH_GBA_LUMINANCE, &lux);
471 biosName = "gba_bios.bin";
472
473 }
474#endif
475
476#ifdef M_CORE_GB
477 if (core->platform(core) == PLATFORM_GB) {
478 const char* modelName = mCoreConfigGetValue(&core->config, "gb.model");
479 struct GB* gb = core->board;
480
481 if (modelName) {
482 gb->model = GBNameToModel(modelName);
483 } else {
484 GBDetectModel(gb);
485 }
486
487 switch (gb->model) {
488 case GB_MODEL_AGB:
489 case GB_MODEL_CGB:
490 biosName = "gbc_bios.bin";
491 break;
492 case GB_MODEL_SGB:
493 biosName = "sgb_bios.bin";
494 break;
495 case GB_MODEL_DMG:
496 default:
497 biosName = "gb_bios.bin";
498 break;
499 };
500 }
501#endif
502
503 if (core->opts.useBios && sysDir && biosName) {
504 snprintf(biosPath, sizeof(biosPath), "%s%s%s", sysDir, PATH_SEP, biosName);
505 struct VFile* bios = VFileOpen(biosPath, O_RDONLY);
506 if (bios) {
507 core->loadBIOS(core, bios, 0);
508 }
509 }
510
511 core->reset(core);
512 _setupMaps(core);
513
514 return true;
515}
516
517void retro_unload_game(void) {
518 if (!core) {
519 return;
520 }
521 core->deinit(core);
522 mappedMemoryFree(data, dataSize);
523 data = 0;
524 mappedMemoryFree(savedata, SIZE_CART_FLASH1M);
525 savedata = 0;
526 CircleBufferDeinit(&rumbleHistory);
527}
528
529size_t retro_serialize_size(void) {
530 return core->stateSize(core);
531}
532
533bool retro_serialize(void* data, size_t size) {
534 if (size != retro_serialize_size()) {
535 return false;
536 }
537 core->saveState(core, data);
538 return true;
539}
540
541bool retro_unserialize(const void* data, size_t size) {
542 if (size != retro_serialize_size()) {
543 return false;
544 }
545 core->loadState(core, data);
546 return true;
547}
548
549void retro_cheat_reset(void) {
550 mCheatDeviceClear(core->cheatDevice(core));
551}
552
553void retro_cheat_set(unsigned index, bool enabled, const char* code) {
554 UNUSED(index);
555 UNUSED(enabled);
556 struct mCheatDevice* device = core->cheatDevice(core);
557 struct mCheatSet* cheatSet = NULL;
558 if (mCheatSetsSize(&device->cheats)) {
559 cheatSet = *mCheatSetsGetPointer(&device->cheats, 0);
560 } else {
561 cheatSet = device->createSet(device, NULL);
562 mCheatAddSet(device, cheatSet);
563 }
564 // Convert the super wonky unportable libretro format to something normal
565 char realCode[] = "XXXXXXXX XXXXXXXX";
566 size_t len = strlen(code) + 1; // Include null terminator
567 size_t i, pos;
568 for (i = 0, pos = 0; i < len; ++i) {
569 if (isspace((int) code[i]) || code[i] == '+') {
570 realCode[pos] = ' ';
571 } else {
572 realCode[pos] = code[i];
573 }
574 if ((pos == 13 && (realCode[pos] == ' ' || !realCode[pos])) || pos == 17) {
575 realCode[pos] = '\0';
576 mCheatAddLine(cheatSet, realCode, 0);
577 pos = 0;
578 continue;
579 }
580 ++pos;
581 }
582}
583
584unsigned retro_get_region(void) {
585 return RETRO_REGION_NTSC; // TODO: This isn't strictly true
586}
587
588void retro_set_controller_port_device(unsigned port, unsigned device) {
589 UNUSED(port);
590 UNUSED(device);
591}
592
593bool retro_load_game_special(unsigned game_type, const struct retro_game_info* info, size_t num_info) {
594 UNUSED(game_type);
595 UNUSED(info);
596 UNUSED(num_info);
597 return false;
598}
599
600void* retro_get_memory_data(unsigned id) {
601 if (id != RETRO_MEMORY_SAVE_RAM) {
602 return 0;
603 }
604 return savedata;
605}
606
607size_t retro_get_memory_size(unsigned id) {
608 if (id != RETRO_MEMORY_SAVE_RAM) {
609 return 0;
610 }
611#ifdef M_CORE_GBA
612 if (core->platform(core) == PLATFORM_GBA) {
613 switch (((struct GBA*) core->board)->memory.savedata.type) {
614 case SAVEDATA_AUTODETECT:
615 return SIZE_CART_FLASH1M;
616 default:
617 return GBASavedataSize(&((struct GBA*) core->board)->memory.savedata);
618 }
619 }
620#endif
621#ifdef M_CORE_GB
622 if (core->platform(core) == PLATFORM_GB) {
623 return ((struct GB*) core->board)->sramSize;
624 }
625#endif
626 return 0;
627}
628
629void GBARetroLog(struct mLogger* logger, int category, enum mLogLevel level, const char* format, va_list args) {
630 UNUSED(logger);
631 if (!logCallback) {
632 return;
633 }
634
635 char message[128];
636 vsnprintf(message, sizeof(message), format, args);
637
638 enum retro_log_level retroLevel = RETRO_LOG_INFO;
639 switch (level) {
640 case mLOG_ERROR:
641 case mLOG_FATAL:
642 retroLevel = RETRO_LOG_ERROR;
643 break;
644 case mLOG_WARN:
645 retroLevel = RETRO_LOG_WARN;
646 break;
647 case mLOG_INFO:
648 retroLevel = RETRO_LOG_INFO;
649 break;
650 case mLOG_GAME_ERROR:
651 case mLOG_STUB:
652#ifdef NDEBUG
653 return;
654#else
655 retroLevel = RETRO_LOG_DEBUG;
656 break;
657#endif
658 case mLOG_DEBUG:
659 retroLevel = RETRO_LOG_DEBUG;
660 break;
661 }
662#ifdef NDEBUG
663 static int biosCat = -1;
664 if (biosCat < 0) {
665 biosCat = mLogCategoryById("gba.bios");
666 }
667
668 if (category == biosCat) {
669 return;
670 }
671#endif
672 logCallback(retroLevel, "%s: %s\n", mLogCategoryName(category), message);
673}
674
675static void _postAudioBuffer(struct mAVStream* stream, blip_t* left, blip_t* right) {
676 UNUSED(stream);
677 int16_t samples[SAMPLES * 2];
678 blip_read_samples(left, samples, SAMPLES, true);
679 blip_read_samples(right, samples + 1, SAMPLES, true);
680 audioCallback(samples, SAMPLES);
681}
682
683static void _setRumble(struct mRumble* rumble, int enable) {
684 UNUSED(rumble);
685 if (!rumbleCallback) {
686 return;
687 }
688 rumbleLevel += enable;
689 if (CircleBufferSize(&rumbleHistory) == RUMBLE_PWM) {
690 int8_t oldLevel;
691 CircleBufferRead8(&rumbleHistory, &oldLevel);
692 rumbleLevel -= oldLevel;
693 }
694 CircleBufferWrite8(&rumbleHistory, enable);
695 rumbleCallback(0, RETRO_RUMBLE_STRONG, rumbleLevel * 0xFFFF / RUMBLE_PWM);
696 rumbleCallback(0, RETRO_RUMBLE_WEAK, rumbleLevel * 0xFFFF / RUMBLE_PWM);
697}
698
699static void _updateLux(struct GBALuminanceSource* lux) {
700 UNUSED(lux);
701 struct retro_variable var = {
702 .key = "mgba_solar_sensor_level",
703 .value = 0
704 };
705
706 bool updated = false;
707 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) || !updated) {
708 return;
709 }
710 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) || !var.value) {
711 return;
712 }
713
714 char* end;
715 int newLuxLevel = strtol(var.value, &end, 10);
716 if (!*end) {
717 if (newLuxLevel > 10) {
718 luxLevel = 10;
719 } else if (newLuxLevel < 0) {
720 luxLevel = 0;
721 } else {
722 luxLevel = newLuxLevel;
723 }
724 }
725}
726
727static uint8_t _readLux(struct GBALuminanceSource* lux) {
728 UNUSED(lux);
729 int value = 0x16;
730 if (luxLevel > 0) {
731 value += GBA_LUX_LEVELS[luxLevel - 1];
732 }
733 return 0xFF - value;
734}