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 };
182 environCallback(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, &inputDescriptors);
183
184 // TODO: RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME when BIOS booting is supported
185
186 struct retro_rumble_interface rumbleInterface;
187 if (environCallback(RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE, &rumbleInterface)) {
188 rumbleCallback = rumbleInterface.set_rumble_state;
189 CircleBufferInit(&rumbleHistory, RUMBLE_PWM);
190 rumble.setRumble = _setRumble;
191 } else {
192 rumbleCallback = 0;
193 }
194
195 luxLevel = 0;
196 lux.readLuminance = _readLux;
197 lux.sample = _updateLux;
198 _updateLux(&lux);
199
200 struct retro_log_callback log;
201 if (environCallback(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log)) {
202 logCallback = log.log;
203 } else {
204 logCallback = 0;
205 }
206 logger.log = GBARetroLog;
207 mLogSetDefaultLogger(&logger);
208
209 stream.videoDimensionsChanged = 0;
210 stream.postAudioFrame = 0;
211 stream.postAudioBuffer = _postAudioBuffer;
212 stream.postVideoFrame = 0;
213}
214
215void retro_deinit(void) {
216 free(outputBuffer);
217}
218
219void retro_run(void) {
220 uint16_t keys;
221 inputPollCallback();
222
223 struct retro_variable var = {
224 .key = "mgba_allow_opposing_directions",
225 .value = 0
226 };
227
228 bool updated = false;
229 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated) {
230 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
231 ((struct GBA*) core->board)->allowOpposingDirections = strcmp(var.value, "yes") == 0;
232 }
233 }
234
235 keys = 0;
236 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A)) << 0;
237 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B)) << 1;
238 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT)) << 2;
239 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START)) << 3;
240 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT)) << 4;
241 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT)) << 5;
242 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP)) << 6;
243 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN)) << 7;
244 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R)) << 8;
245 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L)) << 9;
246 core->setKeys(core, keys);
247
248 static bool wasAdjustingLux = false;
249 if (wasAdjustingLux) {
250 wasAdjustingLux = inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3) ||
251 inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3);
252 } else {
253 if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3)) {
254 ++luxLevel;
255 if (luxLevel > 10) {
256 luxLevel = 10;
257 }
258 wasAdjustingLux = true;
259 } else if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3)) {
260 --luxLevel;
261 if (luxLevel < 0) {
262 luxLevel = 0;
263 }
264 wasAdjustingLux = true;
265 }
266 }
267
268 core->runFrame(core);
269 unsigned width, height;
270 core->desiredVideoDimensions(core, &width, &height);
271 videoCallback(outputBuffer, width, height, BYTES_PER_PIXEL * 256);
272}
273
274void static _setupMaps(struct mCore* core) {
275#ifdef M_CORE_GBA
276 if (core->platform(core) == PLATFORM_GBA) {
277 struct GBA* gba = core->board;
278 struct retro_memory_descriptor descs[11];
279 struct retro_memory_map mmaps;
280 size_t romSize = gba->memory.romSize + (gba->memory.romSize & 1);
281
282 memset(descs, 0, sizeof(descs));
283 size_t savedataSize = retro_get_memory_size(RETRO_MEMORY_SAVE_RAM);
284
285 /* Map internal working RAM */
286 descs[0].ptr = gba->memory.iwram;
287 descs[0].start = BASE_WORKING_IRAM;
288 descs[0].len = SIZE_WORKING_IRAM;
289 descs[0].select = 0xFF000000;
290
291 /* Map working RAM */
292 descs[1].ptr = gba->memory.wram;
293 descs[1].start = BASE_WORKING_RAM;
294 descs[1].len = SIZE_WORKING_RAM;
295 descs[1].select = 0xFF000000;
296
297 /* Map save RAM */
298 /* TODO: if SRAM is flash, use start=0 addrspace="S" instead */
299 descs[2].ptr = savedataSize ? savedata : NULL;
300 descs[2].start = BASE_CART_SRAM;
301 descs[2].len = savedataSize;
302
303 /* Map ROM */
304 descs[3].ptr = gba->memory.rom;
305 descs[3].start = BASE_CART0;
306 descs[3].len = romSize;
307 descs[3].flags = RETRO_MEMDESC_CONST;
308
309 descs[4].ptr = gba->memory.rom;
310 descs[4].start = BASE_CART1;
311 descs[4].len = romSize;
312 descs[4].flags = RETRO_MEMDESC_CONST;
313
314 descs[5].ptr = gba->memory.rom;
315 descs[5].start = BASE_CART2;
316 descs[5].len = romSize;
317 descs[5].flags = RETRO_MEMDESC_CONST;
318
319 /* Map BIOS */
320 descs[6].ptr = gba->memory.bios;
321 descs[6].start = BASE_BIOS;
322 descs[6].len = SIZE_BIOS;
323 descs[6].flags = RETRO_MEMDESC_CONST;
324
325 /* Map VRAM */
326 descs[7].ptr = gba->video.vram;
327 descs[7].start = BASE_VRAM;
328 descs[7].len = SIZE_VRAM;
329 descs[7].select = 0xFF000000;
330
331 /* Map palette RAM */
332 descs[8].ptr = gba->video.palette;
333 descs[8].start = BASE_PALETTE_RAM;
334 descs[8].len = SIZE_PALETTE_RAM;
335 descs[8].select = 0xFF000000;
336
337 /* Map OAM */
338 descs[9].ptr = &gba->video.oam; /* video.oam is a structure */
339 descs[9].start = BASE_OAM;
340 descs[9].len = SIZE_OAM;
341 descs[9].select = 0xFF000000;
342
343 /* Map mmapped I/O */
344 descs[10].ptr = gba->memory.io;
345 descs[10].start = BASE_IO;
346 descs[10].len = SIZE_IO;
347
348 mmaps.descriptors = descs;
349 mmaps.num_descriptors = sizeof(descs) / sizeof(descs[0]);
350
351 bool yes = true;
352 environCallback(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &mmaps);
353 environCallback(RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS, &yes);
354 }
355#endif
356}
357
358void retro_reset(void) {
359 core->reset(core);
360 _setupMaps(core);
361
362 if (rumbleCallback) {
363 CircleBufferClear(&rumbleHistory);
364 }
365}
366
367bool retro_load_game(const struct retro_game_info* game) {
368 struct VFile* rom;
369 if (game->data) {
370 data = anonymousMemoryMap(game->size);
371 dataSize = game->size;
372 memcpy(data, game->data, game->size);
373 rom = VFileFromMemory(data, game->size);
374 } else {
375 data = 0;
376 rom = VFileOpen(game->path, O_RDONLY);
377 }
378 if (!rom) {
379 return false;
380 }
381
382 core = mCoreFindVF(rom);
383 if (!core) {
384 rom->close(rom);
385 mappedMemoryFree(data, game->size);
386 return false;
387 }
388 mCoreInitConfig(core, NULL);
389 core->init(core);
390 core->setAVStream(core, &stream);
391
392 outputBuffer = malloc(256 * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
393 core->setVideoBuffer(core, outputBuffer, 256);
394
395 core->setAudioBufferSize(core, SAMPLES);
396
397 blip_set_rates(core->getAudioChannel(core, 0), core->frequency(core), 32768);
398 blip_set_rates(core->getAudioChannel(core, 1), core->frequency(core), 32768);
399
400 core->setRumble(core, &rumble);
401
402 savedata = anonymousMemoryMap(SIZE_CART_FLASH1M);
403 struct VFile* save = VFileFromMemory(savedata, SIZE_CART_FLASH1M);
404
405 _reloadSettings();
406 core->loadROM(core, rom);
407 core->loadSave(core, save);
408
409#ifdef M_CORE_GBA
410 if (core->platform(core) == PLATFORM_GBA) {
411 struct GBA* gba = core->board;
412 gba->luminanceSource = &lux;
413
414 const char* sysDir = 0;
415 if (environCallback(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &sysDir)) {
416 char biosPath[PATH_MAX];
417 snprintf(biosPath, sizeof(biosPath), "%s%s%s", sysDir, PATH_SEP, "gba_bios.bin");
418 struct VFile* bios = VFileOpen(biosPath, O_RDONLY);
419 if (bios) {
420 core->loadBIOS(core, bios, 0);
421 }
422 }
423 }
424#endif
425
426 core->reset(core);
427 _setupMaps(core);
428
429 return true;
430}
431
432void retro_unload_game(void) {
433 if (!core) {
434 return;
435 }
436 core->deinit(core);
437 mappedMemoryFree(data, dataSize);
438 data = 0;
439 mappedMemoryFree(savedata, SIZE_CART_FLASH1M);
440 savedata = 0;
441 CircleBufferDeinit(&rumbleHistory);
442}
443
444size_t retro_serialize_size(void) {
445 return sizeof(struct GBASerializedState);
446}
447
448bool retro_serialize(void* data, size_t size) {
449 if (size != retro_serialize_size()) {
450 return false;
451 }
452 GBASerialize(core->board, data);
453 return true;
454}
455
456bool retro_unserialize(const void* data, size_t size) {
457 if (size != retro_serialize_size()) {
458 return false;
459 }
460 GBADeserialize(core->board, data);
461 return true;
462}
463
464void retro_cheat_reset(void) {
465 mCheatDeviceClear(core->cheatDevice(core));
466}
467
468void retro_cheat_set(unsigned index, bool enabled, const char* code) {
469 UNUSED(index);
470 UNUSED(enabled);
471 struct mCheatDevice* device = core->cheatDevice(core);
472 struct mCheatSet* cheatSet = NULL;
473 if (mCheatSetsSize(&device->cheats)) {
474 cheatSet = *mCheatSetsGetPointer(&device->cheats, 0);
475 } else {
476 cheatSet = device->createSet(device, NULL);
477 mCheatAddSet(device, cheatSet);
478 }
479 // Convert the super wonky unportable libretro format to something normal
480 char realCode[] = "XXXXXXXX XXXXXXXX";
481 size_t len = strlen(code) + 1; // Include null terminator
482 size_t i, pos;
483 for (i = 0, pos = 0; i < len; ++i) {
484 if (isspace((int) code[i]) || code[i] == '+') {
485 realCode[pos] = ' ';
486 } else {
487 realCode[pos] = code[i];
488 }
489 if ((pos == 13 && (realCode[pos] == ' ' || !realCode[pos])) || pos == 17) {
490 realCode[pos] = '\0';
491 mCheatAddLine(cheatSet, realCode, 0);
492 pos = 0;
493 continue;
494 }
495 ++pos;
496 }
497}
498
499unsigned retro_get_region(void) {
500 return RETRO_REGION_NTSC; // TODO: This isn't strictly true
501}
502
503void retro_set_controller_port_device(unsigned port, unsigned device) {
504 UNUSED(port);
505 UNUSED(device);
506}
507
508bool retro_load_game_special(unsigned game_type, const struct retro_game_info* info, size_t num_info) {
509 UNUSED(game_type);
510 UNUSED(info);
511 UNUSED(num_info);
512 return false;
513}
514
515void* retro_get_memory_data(unsigned id) {
516 if (id != RETRO_MEMORY_SAVE_RAM) {
517 return 0;
518 }
519 return savedata;
520}
521
522size_t retro_get_memory_size(unsigned id) {
523 if (id != RETRO_MEMORY_SAVE_RAM) {
524 return 0;
525 }
526 switch (((struct GBA*) core->board)->memory.savedata.type) {
527 case SAVEDATA_AUTODETECT:
528 case SAVEDATA_FLASH1M:
529 return SIZE_CART_FLASH1M;
530 case SAVEDATA_FLASH512:
531 return SIZE_CART_FLASH512;
532 case SAVEDATA_EEPROM:
533 return SIZE_CART_EEPROM;
534 case SAVEDATA_SRAM:
535 return SIZE_CART_SRAM;
536 case SAVEDATA_FORCE_NONE:
537 return 0;
538 }
539 return 0;
540}
541
542void GBARetroLog(struct mLogger* logger, int category, enum mLogLevel level, const char* format, va_list args) {
543 UNUSED(logger);
544 if (!logCallback) {
545 return;
546 }
547
548 char message[128];
549 vsnprintf(message, sizeof(message), format, args);
550
551 enum retro_log_level retroLevel = RETRO_LOG_INFO;
552 switch (level) {
553 case mLOG_ERROR:
554 case mLOG_FATAL:
555 retroLevel = RETRO_LOG_ERROR;
556 break;
557 case mLOG_WARN:
558 retroLevel = RETRO_LOG_WARN;
559 break;
560 case mLOG_INFO:
561 retroLevel = RETRO_LOG_INFO;
562 break;
563 case mLOG_GAME_ERROR:
564 case mLOG_STUB:
565#ifdef NDEBUG
566 return;
567#else
568 retroLevel = RETRO_LOG_DEBUG;
569 break;
570#endif
571 case mLOG_DEBUG:
572 retroLevel = RETRO_LOG_DEBUG;
573 break;
574 }
575#ifdef NDEBUG
576 if (category == _mLOG_CAT_GBA_BIOS()) {
577 return;
578 }
579#endif
580 logCallback(retroLevel, "%s: %s\n", mLogCategoryName(category), message);
581}
582
583static void _postAudioBuffer(struct mAVStream* stream, blip_t* left, blip_t* right) {
584 UNUSED(stream);
585 int16_t samples[SAMPLES * 2];
586 blip_read_samples(left, samples, SAMPLES, true);
587 blip_read_samples(right, samples + 1, SAMPLES, true);
588 audioCallback(samples, SAMPLES);
589}
590
591static void _setRumble(struct mRumble* rumble, int enable) {
592 UNUSED(rumble);
593 if (!rumbleCallback) {
594 return;
595 }
596 rumbleLevel += enable;
597 if (CircleBufferSize(&rumbleHistory) == RUMBLE_PWM) {
598 int8_t oldLevel;
599 CircleBufferRead8(&rumbleHistory, &oldLevel);
600 rumbleLevel -= oldLevel;
601 }
602 CircleBufferWrite8(&rumbleHistory, enable);
603 rumbleCallback(0, RETRO_RUMBLE_STRONG, rumbleLevel * 0xFFFF / RUMBLE_PWM);
604 rumbleCallback(0, RETRO_RUMBLE_WEAK, rumbleLevel * 0xFFFF / RUMBLE_PWM);
605}
606
607static void _updateLux(struct GBALuminanceSource* lux) {
608 UNUSED(lux);
609 struct retro_variable var = {
610 .key = "mgba_solar_sensor_level",
611 .value = 0
612 };
613
614 bool updated = false;
615 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) || !updated) {
616 return;
617 }
618 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) || !var.value) {
619 return;
620 }
621
622 char* end;
623 int newLuxLevel = strtol(var.value, &end, 10);
624 if (!*end) {
625 if (newLuxLevel > 10) {
626 luxLevel = 10;
627 } else if (newLuxLevel < 0) {
628 luxLevel = 0;
629 } else {
630 luxLevel = newLuxLevel;
631 }
632 }
633}
634
635static uint8_t _readLux(struct GBALuminanceSource* lux) {
636 UNUSED(lux);
637 int value = 0x16;
638 if (luxLevel > 0) {
639 value += GBA_LUX_LEVELS[luxLevel - 1];
640 }
641 return 0xFF - value;
642}