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 "util/common.h"
9
10#include "core/core.h"
11#include "core/version.h"
12#ifdef M_CORE_GB
13#include "gb/core.h"
14#include "gb/gb.h"
15#endif
16#ifdef M_CORE_GBA
17#include "gba/bios.h"
18#include "gba/core.h"
19#include "gba/cheats.h"
20#include "gba/core.h"
21#include "gba/serialize.h"
22#endif
23#include "util/circle-buffer.h"
24#include "util/memory.h"
25#include "util/vfs.h"
26
27#define SAMPLES 1024
28#define RUMBLE_PWM 35
29
30static retro_environment_t environCallback;
31static retro_video_refresh_t videoCallback;
32static retro_audio_sample_batch_t audioCallback;
33static retro_input_poll_t inputPollCallback;
34static retro_input_state_t inputCallback;
35static retro_log_printf_t logCallback;
36static retro_set_rumble_state_t rumbleCallback;
37
38static void GBARetroLog(struct mLogger* logger, int category, enum mLogLevel level, const char* format, va_list args);
39
40static void _postAudioBuffer(struct mAVStream*, blip_t* left, blip_t* right);
41static void _setRumble(struct mRumble* rumble, int enable);
42static uint8_t _readLux(struct GBALuminanceSource* lux);
43static void _updateLux(struct GBALuminanceSource* lux);
44
45static struct mCore* core;
46static void* outputBuffer;
47static void* data;
48static size_t dataSize;
49static void* savedata;
50static struct mAVStream stream;
51static int rumbleLevel;
52static struct CircleBuffer rumbleHistory;
53static struct mRumble rumble;
54static struct GBALuminanceSource lux;
55static int luxLevel;
56static struct mLogger logger;
57
58static void _reloadSettings(void) {
59 struct mCoreOptions opts = {
60 .useBios = true,
61 .volume = 0x100,
62 };
63
64 struct retro_variable var;
65
66 var.key = "mgba_use_bios";
67 var.value = 0;
68 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
69 opts.useBios = strcmp(var.value, "ON") == 0;
70 }
71
72 var.key = "mgba_skip_bios";
73 var.value = 0;
74 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
75 opts.skipBios = strcmp(var.value, "ON") == 0;
76 }
77
78 var.key = "mgba_idle_optimization";
79 var.value = 0;
80 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
81 if (strcmp(var.value, "Don't Remove") == 0) {
82 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "ignore");
83 } else if (strcmp(var.value, "Remove Known") == 0) {
84 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "remove");
85 } else if (strcmp(var.value, "Detect and Remove") == 0) {
86 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "detect");
87 }
88 }
89
90 mCoreConfigLoadDefaults(&core->config, &opts);
91 mCoreLoadConfig(core);
92}
93
94unsigned retro_api_version(void) {
95 return RETRO_API_VERSION;
96}
97
98void retro_set_environment(retro_environment_t env) {
99 environCallback = env;
100
101 struct retro_variable vars[] = {
102 { "mgba_solar_sensor_level", "Solar sensor level; 0|1|2|3|4|5|6|7|8|9|10" },
103 { "mgba_allow_opposing_directions", "Allow opposing directional input; OFF|ON" },
104 { "mgba_use_bios", "Use BIOS file if found; ON|OFF" },
105 { "mgba_skip_bios", "Skip BIOS intro; OFF|ON" },
106 { "mgba_idle_optimization", "Idle loop removal; Remove Known|Detect and Remove|Don't Remove" },
107 { 0, 0 }
108 };
109
110 environCallback(RETRO_ENVIRONMENT_SET_VARIABLES, vars);
111}
112
113void retro_set_video_refresh(retro_video_refresh_t video) {
114 videoCallback = video;
115}
116
117void retro_set_audio_sample(retro_audio_sample_t audio) {
118 UNUSED(audio);
119}
120
121void retro_set_audio_sample_batch(retro_audio_sample_batch_t audioBatch) {
122 audioCallback = audioBatch;
123}
124
125void retro_set_input_poll(retro_input_poll_t inputPoll) {
126 inputPollCallback = inputPoll;
127}
128
129void retro_set_input_state(retro_input_state_t input) {
130 inputCallback = input;
131}
132
133void retro_get_system_info(struct retro_system_info* info) {
134 info->need_fullpath = false;
135 info->valid_extensions = "gba|gb|gbc";
136 info->library_version = projectVersion;
137 info->library_name = projectName;
138 info->block_extract = false;
139}
140
141void retro_get_system_av_info(struct retro_system_av_info* info) {
142 unsigned width, height;
143 core->desiredVideoDimensions(core, &width, &height);
144 info->geometry.base_width = width;
145 info->geometry.base_height = height;
146 info->geometry.max_width = width;
147 info->geometry.max_height = height;
148 info->geometry.aspect_ratio = width / (double) height;
149 info->timing.fps = GBA_ARM7TDMI_FREQUENCY / (float) VIDEO_TOTAL_LENGTH;
150 info->timing.sample_rate = 32768;
151}
152
153void retro_init(void) {
154 enum retro_pixel_format fmt;
155#ifdef COLOR_16_BIT
156#ifdef COLOR_5_6_5
157 fmt = RETRO_PIXEL_FORMAT_RGB565;
158#else
159#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
160 fmt = RETRO_PIXEL_FORMAT_0RGB1555;
161#endif
162#else
163#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
164 fmt = RETRO_PIXEL_FORMAT_XRGB8888;
165#endif
166 environCallback(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt);
167
168 struct retro_input_descriptor inputDescriptors[] = {
169 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "A" },
170 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
171 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT, "Select" },
172 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
173 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
174 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
175 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
176 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
177 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "R" },
178 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "L" },
179 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3, "Brighten Solar Sensor" },
180 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3, "Darken Solar Sensor" },
181 { 0 }
182 };
183 environCallback(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, &inputDescriptors);
184
185 // TODO: RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME when BIOS booting is supported
186
187 struct retro_rumble_interface rumbleInterface;
188 if (environCallback(RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE, &rumbleInterface)) {
189 rumbleCallback = rumbleInterface.set_rumble_state;
190 CircleBufferInit(&rumbleHistory, RUMBLE_PWM);
191 rumble.setRumble = _setRumble;
192 } else {
193 rumbleCallback = 0;
194 }
195
196 luxLevel = 0;
197 lux.readLuminance = _readLux;
198 lux.sample = _updateLux;
199 _updateLux(&lux);
200
201 struct retro_log_callback log;
202 if (environCallback(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log)) {
203 logCallback = log.log;
204 } else {
205 logCallback = 0;
206 }
207 logger.log = GBARetroLog;
208 mLogSetDefaultLogger(&logger);
209
210 stream.videoDimensionsChanged = 0;
211 stream.postAudioFrame = 0;
212 stream.postAudioBuffer = _postAudioBuffer;
213 stream.postVideoFrame = 0;
214}
215
216void retro_deinit(void) {
217 free(outputBuffer);
218}
219
220void retro_run(void) {
221 uint16_t keys;
222 inputPollCallback();
223
224 struct retro_variable var = {
225 .key = "mgba_allow_opposing_directions",
226 .value = 0
227 };
228
229 bool updated = false;
230 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated) {
231 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
232 ((struct GBA*) core->board)->allowOpposingDirections = strcmp(var.value, "yes") == 0;
233 }
234 }
235
236 keys = 0;
237 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A)) << 0;
238 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B)) << 1;
239 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT)) << 2;
240 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START)) << 3;
241 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT)) << 4;
242 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT)) << 5;
243 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP)) << 6;
244 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN)) << 7;
245 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R)) << 8;
246 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L)) << 9;
247 core->setKeys(core, keys);
248
249 static bool wasAdjustingLux = false;
250 if (wasAdjustingLux) {
251 wasAdjustingLux = inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3) ||
252 inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3);
253 } else {
254 if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3)) {
255 ++luxLevel;
256 if (luxLevel > 10) {
257 luxLevel = 10;
258 }
259 wasAdjustingLux = true;
260 } else if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3)) {
261 --luxLevel;
262 if (luxLevel < 0) {
263 luxLevel = 0;
264 }
265 wasAdjustingLux = true;
266 }
267 }
268
269 core->runFrame(core);
270 unsigned width, height;
271 core->desiredVideoDimensions(core, &width, &height);
272 videoCallback(outputBuffer, width, height, BYTES_PER_PIXEL * 256);
273}
274
275void static _setupMaps(struct mCore* core) {
276#ifdef M_CORE_GBA
277 if (core->platform(core) == PLATFORM_GBA) {
278 struct GBA* gba = core->board;
279 struct retro_memory_descriptor descs[11];
280 struct retro_memory_map mmaps;
281 size_t romSize = gba->memory.romSize + (gba->memory.romSize & 1);
282
283 memset(descs, 0, sizeof(descs));
284 size_t savedataSize = retro_get_memory_size(RETRO_MEMORY_SAVE_RAM);
285
286 /* Map internal working RAM */
287 descs[0].ptr = gba->memory.iwram;
288 descs[0].start = BASE_WORKING_IRAM;
289 descs[0].len = SIZE_WORKING_IRAM;
290 descs[0].select = 0xFF000000;
291
292 /* Map working RAM */
293 descs[1].ptr = gba->memory.wram;
294 descs[1].start = BASE_WORKING_RAM;
295 descs[1].len = SIZE_WORKING_RAM;
296 descs[1].select = 0xFF000000;
297
298 /* Map save RAM */
299 /* TODO: if SRAM is flash, use start=0 addrspace="S" instead */
300 descs[2].ptr = savedataSize ? savedata : NULL;
301 descs[2].start = BASE_CART_SRAM;
302 descs[2].len = savedataSize;
303
304 /* Map ROM */
305 descs[3].ptr = gba->memory.rom;
306 descs[3].start = BASE_CART0;
307 descs[3].len = romSize;
308 descs[3].flags = RETRO_MEMDESC_CONST;
309
310 descs[4].ptr = gba->memory.rom;
311 descs[4].start = BASE_CART1;
312 descs[4].len = romSize;
313 descs[4].flags = RETRO_MEMDESC_CONST;
314
315 descs[5].ptr = gba->memory.rom;
316 descs[5].start = BASE_CART2;
317 descs[5].len = romSize;
318 descs[5].flags = RETRO_MEMDESC_CONST;
319
320 /* Map BIOS */
321 descs[6].ptr = gba->memory.bios;
322 descs[6].start = BASE_BIOS;
323 descs[6].len = SIZE_BIOS;
324 descs[6].flags = RETRO_MEMDESC_CONST;
325
326 /* Map VRAM */
327 descs[7].ptr = gba->video.vram;
328 descs[7].start = BASE_VRAM;
329 descs[7].len = SIZE_VRAM;
330 descs[7].select = 0xFF000000;
331
332 /* Map palette RAM */
333 descs[8].ptr = gba->video.palette;
334 descs[8].start = BASE_PALETTE_RAM;
335 descs[8].len = SIZE_PALETTE_RAM;
336 descs[8].select = 0xFF000000;
337
338 /* Map OAM */
339 descs[9].ptr = &gba->video.oam; /* video.oam is a structure */
340 descs[9].start = BASE_OAM;
341 descs[9].len = SIZE_OAM;
342 descs[9].select = 0xFF000000;
343
344 /* Map mmapped I/O */
345 descs[10].ptr = gba->memory.io;
346 descs[10].start = BASE_IO;
347 descs[10].len = SIZE_IO;
348
349 mmaps.descriptors = descs;
350 mmaps.num_descriptors = sizeof(descs) / sizeof(descs[0]);
351
352 bool yes = true;
353 environCallback(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &mmaps);
354 environCallback(RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS, &yes);
355 }
356#endif
357}
358
359void retro_reset(void) {
360 core->reset(core);
361 _setupMaps(core);
362
363 if (rumbleCallback) {
364 CircleBufferClear(&rumbleHistory);
365 }
366}
367
368bool retro_load_game(const struct retro_game_info* game) {
369 struct VFile* rom;
370 if (game->data) {
371 data = anonymousMemoryMap(game->size);
372 dataSize = game->size;
373 memcpy(data, game->data, game->size);
374 rom = VFileFromMemory(data, game->size);
375 } else {
376 data = 0;
377 rom = VFileOpen(game->path, O_RDONLY);
378 }
379 if (!rom) {
380 return false;
381 }
382
383 core = mCoreFindVF(rom);
384 if (!core) {
385 rom->close(rom);
386 mappedMemoryFree(data, game->size);
387 return false;
388 }
389 mCoreInitConfig(core, NULL);
390 core->init(core);
391 core->setAVStream(core, &stream);
392
393 outputBuffer = malloc(256 * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
394 core->setVideoBuffer(core, outputBuffer, 256);
395
396 core->setAudioBufferSize(core, SAMPLES);
397
398 blip_set_rates(core->getAudioChannel(core, 0), core->frequency(core), 32768);
399 blip_set_rates(core->getAudioChannel(core, 1), core->frequency(core), 32768);
400
401 core->setRumble(core, &rumble);
402
403 savedata = anonymousMemoryMap(SIZE_CART_FLASH1M);
404 struct VFile* save = VFileFromMemory(savedata, SIZE_CART_FLASH1M);
405
406 _reloadSettings();
407 core->loadROM(core, rom);
408 core->loadSave(core, save);
409
410#ifdef M_CORE_GBA
411 if (core->platform(core) == PLATFORM_GBA) {
412 struct GBA* gba = core->board;
413 gba->luminanceSource = &lux;
414
415 const char* sysDir = 0;
416 if (core->opts.useBios && environCallback(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &sysDir)) {
417 char biosPath[PATH_MAX];
418 snprintf(biosPath, sizeof(biosPath), "%s%s%s", sysDir, PATH_SEP, "gba_bios.bin");
419 struct VFile* bios = VFileOpen(biosPath, O_RDONLY);
420 if (bios) {
421 core->loadBIOS(core, bios, 0);
422 }
423 }
424 }
425#endif
426
427 core->reset(core);
428 _setupMaps(core);
429
430 return true;
431}
432
433void retro_unload_game(void) {
434 if (!core) {
435 return;
436 }
437 core->deinit(core);
438 mappedMemoryFree(data, dataSize);
439 data = 0;
440 mappedMemoryFree(savedata, SIZE_CART_FLASH1M);
441 savedata = 0;
442 CircleBufferDeinit(&rumbleHistory);
443}
444
445size_t retro_serialize_size(void) {
446 return sizeof(struct GBASerializedState);
447}
448
449bool retro_serialize(void* data, size_t size) {
450 if (size != retro_serialize_size()) {
451 return false;
452 }
453 GBASerialize(core->board, data);
454 return true;
455}
456
457bool retro_unserialize(const void* data, size_t size) {
458 if (size != retro_serialize_size()) {
459 return false;
460 }
461 GBADeserialize(core->board, data);
462 return true;
463}
464
465void retro_cheat_reset(void) {
466 mCheatDeviceClear(core->cheatDevice(core));
467}
468
469void retro_cheat_set(unsigned index, bool enabled, const char* code) {
470 UNUSED(index);
471 UNUSED(enabled);
472 struct mCheatDevice* device = core->cheatDevice(core);
473 struct mCheatSet* cheatSet = NULL;
474 if (mCheatSetsSize(&device->cheats)) {
475 cheatSet = *mCheatSetsGetPointer(&device->cheats, 0);
476 } else {
477 cheatSet = device->createSet(device, NULL);
478 mCheatAddSet(device, cheatSet);
479 }
480 // Convert the super wonky unportable libretro format to something normal
481 char realCode[] = "XXXXXXXX XXXXXXXX";
482 size_t len = strlen(code) + 1; // Include null terminator
483 size_t i, pos;
484 for (i = 0, pos = 0; i < len; ++i) {
485 if (isspace((int) code[i]) || code[i] == '+') {
486 realCode[pos] = ' ';
487 } else {
488 realCode[pos] = code[i];
489 }
490 if ((pos == 13 && (realCode[pos] == ' ' || !realCode[pos])) || pos == 17) {
491 realCode[pos] = '\0';
492 mCheatAddLine(cheatSet, realCode, 0);
493 pos = 0;
494 continue;
495 }
496 ++pos;
497 }
498}
499
500unsigned retro_get_region(void) {
501 return RETRO_REGION_NTSC; // TODO: This isn't strictly true
502}
503
504void retro_set_controller_port_device(unsigned port, unsigned device) {
505 UNUSED(port);
506 UNUSED(device);
507}
508
509bool retro_load_game_special(unsigned game_type, const struct retro_game_info* info, size_t num_info) {
510 UNUSED(game_type);
511 UNUSED(info);
512 UNUSED(num_info);
513 return false;
514}
515
516void* retro_get_memory_data(unsigned id) {
517 if (id != RETRO_MEMORY_SAVE_RAM) {
518 return 0;
519 }
520 return savedata;
521}
522
523size_t retro_get_memory_size(unsigned id) {
524 if (id != RETRO_MEMORY_SAVE_RAM) {
525 return 0;
526 }
527 switch (((struct GBA*) core->board)->memory.savedata.type) {
528 case SAVEDATA_AUTODETECT:
529 case SAVEDATA_FLASH1M:
530 return SIZE_CART_FLASH1M;
531 case SAVEDATA_FLASH512:
532 return SIZE_CART_FLASH512;
533 case SAVEDATA_EEPROM:
534 return SIZE_CART_EEPROM;
535 case SAVEDATA_SRAM:
536 return SIZE_CART_SRAM;
537 case SAVEDATA_FORCE_NONE:
538 return 0;
539 }
540 return 0;
541}
542
543void GBARetroLog(struct mLogger* logger, int category, enum mLogLevel level, const char* format, va_list args) {
544 UNUSED(logger);
545 if (!logCallback) {
546 return;
547 }
548
549 char message[128];
550 vsnprintf(message, sizeof(message), format, args);
551
552 enum retro_log_level retroLevel = RETRO_LOG_INFO;
553 switch (level) {
554 case mLOG_ERROR:
555 case mLOG_FATAL:
556 retroLevel = RETRO_LOG_ERROR;
557 break;
558 case mLOG_WARN:
559 retroLevel = RETRO_LOG_WARN;
560 break;
561 case mLOG_INFO:
562 retroLevel = RETRO_LOG_INFO;
563 break;
564 case mLOG_GAME_ERROR:
565 case mLOG_STUB:
566#ifdef NDEBUG
567 return;
568#else
569 retroLevel = RETRO_LOG_DEBUG;
570 break;
571#endif
572 case mLOG_DEBUG:
573 retroLevel = RETRO_LOG_DEBUG;
574 break;
575 }
576#ifdef NDEBUG
577 if (category == _mLOG_CAT_GBA_BIOS()) {
578 return;
579 }
580#endif
581 logCallback(retroLevel, "%s: %s\n", mLogCategoryName(category), message);
582}
583
584static void _postAudioBuffer(struct mAVStream* stream, blip_t* left, blip_t* right) {
585 UNUSED(stream);
586 int16_t samples[SAMPLES * 2];
587 blip_read_samples(left, samples, SAMPLES, true);
588 blip_read_samples(right, samples + 1, SAMPLES, true);
589 audioCallback(samples, SAMPLES);
590}
591
592static void _setRumble(struct mRumble* rumble, int enable) {
593 UNUSED(rumble);
594 if (!rumbleCallback) {
595 return;
596 }
597 rumbleLevel += enable;
598 if (CircleBufferSize(&rumbleHistory) == RUMBLE_PWM) {
599 int8_t oldLevel;
600 CircleBufferRead8(&rumbleHistory, &oldLevel);
601 rumbleLevel -= oldLevel;
602 }
603 CircleBufferWrite8(&rumbleHistory, enable);
604 rumbleCallback(0, RETRO_RUMBLE_STRONG, rumbleLevel * 0xFFFF / RUMBLE_PWM);
605 rumbleCallback(0, RETRO_RUMBLE_WEAK, rumbleLevel * 0xFFFF / RUMBLE_PWM);
606}
607
608static void _updateLux(struct GBALuminanceSource* lux) {
609 UNUSED(lux);
610 struct retro_variable var = {
611 .key = "mgba_solar_sensor_level",
612 .value = 0
613 };
614
615 bool updated = false;
616 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) || !updated) {
617 return;
618 }
619 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) || !var.value) {
620 return;
621 }
622
623 char* end;
624 int newLuxLevel = strtol(var.value, &end, 10);
625 if (!*end) {
626 if (newLuxLevel > 10) {
627 luxLevel = 10;
628 } else if (newLuxLevel < 0) {
629 luxLevel = 0;
630 } else {
631 luxLevel = newLuxLevel;
632 }
633 }
634}
635
636static uint8_t _readLux(struct GBALuminanceSource* lux) {
637 UNUSED(lux);
638 int value = 0x16;
639 if (luxLevel > 0) {
640 value += GBA_LUX_LEVELS[luxLevel - 1];
641 }
642 return 0xFF - value;
643}