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
67 var.key = "mgba_use_bios";
68 var.value = 0;
69 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
70 opts.useBios = strcmp(var.value, "ON") == 0;
71 }
72
73 var.key = "mgba_skip_bios";
74 var.value = 0;
75 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
76 opts.skipBios = strcmp(var.value, "ON") == 0;
77 }
78
79 var.key = "mgba_idle_optimization";
80 var.value = 0;
81 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
82 if (strcmp(var.value, "Don't Remove") == 0) {
83 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "ignore");
84 } else if (strcmp(var.value, "Remove Known") == 0) {
85 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "remove");
86 } else if (strcmp(var.value, "Detect and Remove") == 0) {
87 mCoreConfigSetDefaultValue(&core->config, "idleOptimization", "detect");
88 }
89 }
90
91 mCoreConfigLoadDefaults(&core->config, &opts);
92 mCoreLoadConfig(core);
93}
94
95unsigned retro_api_version(void) {
96 return RETRO_API_VERSION;
97}
98
99void retro_set_environment(retro_environment_t env) {
100 environCallback = env;
101
102 struct retro_variable vars[] = {
103 { "mgba_solar_sensor_level", "Solar sensor level; 0|1|2|3|4|5|6|7|8|9|10" },
104 { "mgba_allow_opposing_directions", "Allow opposing directional input; OFF|ON" },
105 { "mgba_use_bios", "Use BIOS file if found; ON|OFF" },
106 { "mgba_skip_bios", "Skip BIOS intro; OFF|ON" },
107 { "mgba_idle_optimization", "Idle loop removal; Remove Known|Detect and Remove|Don't Remove" },
108 { 0, 0 }
109 };
110
111 environCallback(RETRO_ENVIRONMENT_SET_VARIABLES, vars);
112}
113
114void retro_set_video_refresh(retro_video_refresh_t video) {
115 videoCallback = video;
116}
117
118void retro_set_audio_sample(retro_audio_sample_t audio) {
119 UNUSED(audio);
120}
121
122void retro_set_audio_sample_batch(retro_audio_sample_batch_t audioBatch) {
123 audioCallback = audioBatch;
124}
125
126void retro_set_input_poll(retro_input_poll_t inputPoll) {
127 inputPollCallback = inputPoll;
128}
129
130void retro_set_input_state(retro_input_state_t input) {
131 inputCallback = input;
132}
133
134void retro_get_system_info(struct retro_system_info* info) {
135 info->need_fullpath = false;
136 info->valid_extensions = "gba|gb|gbc";
137 info->library_version = projectVersion;
138 info->library_name = projectName;
139 info->block_extract = false;
140}
141
142void retro_get_system_av_info(struct retro_system_av_info* info) {
143 unsigned width, height;
144 core->desiredVideoDimensions(core, &width, &height);
145 info->geometry.base_width = width;
146 info->geometry.base_height = height;
147 info->geometry.max_width = width;
148 info->geometry.max_height = height;
149 info->geometry.aspect_ratio = width / (double) height;
150 info->timing.fps = core->frequency(core) / (float) core->frameCycles(core);
151 info->timing.sample_rate = 32768;
152}
153
154void retro_init(void) {
155 enum retro_pixel_format fmt;
156#ifdef COLOR_16_BIT
157#ifdef COLOR_5_6_5
158 fmt = RETRO_PIXEL_FORMAT_RGB565;
159#else
160#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
161 fmt = RETRO_PIXEL_FORMAT_0RGB1555;
162#endif
163#else
164#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
165 fmt = RETRO_PIXEL_FORMAT_XRGB8888;
166#endif
167 environCallback(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt);
168
169 struct retro_input_descriptor inputDescriptors[] = {
170 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "A" },
171 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
172 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT, "Select" },
173 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
174 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
175 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
176 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
177 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
178 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "R" },
179 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "L" },
180 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3, "Brighten Solar Sensor" },
181 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3, "Darken Solar Sensor" },
182 { 0 }
183 };
184 environCallback(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, &inputDescriptors);
185
186 // TODO: RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME when BIOS booting is supported
187
188 struct retro_rumble_interface rumbleInterface;
189 if (environCallback(RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE, &rumbleInterface)) {
190 rumbleCallback = rumbleInterface.set_rumble_state;
191 CircleBufferInit(&rumbleHistory, RUMBLE_PWM);
192 rumble.setRumble = _setRumble;
193 } else {
194 rumbleCallback = 0;
195 }
196
197 luxLevel = 0;
198 lux.readLuminance = _readLux;
199 lux.sample = _updateLux;
200 _updateLux(&lux);
201
202 struct retro_log_callback log;
203 if (environCallback(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log)) {
204 logCallback = log.log;
205 } else {
206 logCallback = 0;
207 }
208 logger.log = GBARetroLog;
209 mLogSetDefaultLogger(&logger);
210
211 stream.videoDimensionsChanged = 0;
212 stream.postAudioFrame = 0;
213 stream.postAudioBuffer = _postAudioBuffer;
214 stream.postVideoFrame = 0;
215}
216
217void retro_deinit(void) {
218 free(outputBuffer);
219}
220
221void retro_run(void) {
222 uint16_t keys;
223 inputPollCallback();
224
225 struct retro_variable var = {
226 .key = "mgba_allow_opposing_directions",
227 .value = 0
228 };
229
230 bool updated = false;
231 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) && updated) {
232 if (environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value) {
233 ((struct GBA*) core->board)->allowOpposingDirections = strcmp(var.value, "yes") == 0;
234 }
235 }
236
237 keys = 0;
238 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A)) << 0;
239 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B)) << 1;
240 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT)) << 2;
241 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START)) << 3;
242 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT)) << 4;
243 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT)) << 5;
244 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP)) << 6;
245 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN)) << 7;
246 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R)) << 8;
247 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L)) << 9;
248 core->setKeys(core, keys);
249
250 static bool wasAdjustingLux = false;
251 if (wasAdjustingLux) {
252 wasAdjustingLux = inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3) ||
253 inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3);
254 } else {
255 if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R3)) {
256 ++luxLevel;
257 if (luxLevel > 10) {
258 luxLevel = 10;
259 }
260 wasAdjustingLux = true;
261 } else if (inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L3)) {
262 --luxLevel;
263 if (luxLevel < 0) {
264 luxLevel = 0;
265 }
266 wasAdjustingLux = true;
267 }
268 }
269
270 core->runFrame(core);
271 unsigned width, height;
272 core->desiredVideoDimensions(core, &width, &height);
273 videoCallback(outputBuffer, width, height, BYTES_PER_PIXEL * 256);
274}
275
276void static _setupMaps(struct mCore* core) {
277#ifdef M_CORE_GBA
278 if (core->platform(core) == PLATFORM_GBA) {
279 struct GBA* gba = core->board;
280 struct retro_memory_descriptor descs[11];
281 struct retro_memory_map mmaps;
282 size_t romSize = gba->memory.romSize + (gba->memory.romSize & 1);
283
284 memset(descs, 0, sizeof(descs));
285 size_t savedataSize = retro_get_memory_size(RETRO_MEMORY_SAVE_RAM);
286
287 /* Map internal working RAM */
288 descs[0].ptr = gba->memory.iwram;
289 descs[0].start = BASE_WORKING_IRAM;
290 descs[0].len = SIZE_WORKING_IRAM;
291 descs[0].select = 0xFF000000;
292
293 /* Map working RAM */
294 descs[1].ptr = gba->memory.wram;
295 descs[1].start = BASE_WORKING_RAM;
296 descs[1].len = SIZE_WORKING_RAM;
297 descs[1].select = 0xFF000000;
298
299 /* Map save RAM */
300 /* TODO: if SRAM is flash, use start=0 addrspace="S" instead */
301 descs[2].ptr = savedataSize ? savedata : NULL;
302 descs[2].start = BASE_CART_SRAM;
303 descs[2].len = savedataSize;
304
305 /* Map ROM */
306 descs[3].ptr = gba->memory.rom;
307 descs[3].start = BASE_CART0;
308 descs[3].len = romSize;
309 descs[3].flags = RETRO_MEMDESC_CONST;
310
311 descs[4].ptr = gba->memory.rom;
312 descs[4].start = BASE_CART1;
313 descs[4].len = romSize;
314 descs[4].flags = RETRO_MEMDESC_CONST;
315
316 descs[5].ptr = gba->memory.rom;
317 descs[5].start = BASE_CART2;
318 descs[5].len = romSize;
319 descs[5].flags = RETRO_MEMDESC_CONST;
320
321 /* Map BIOS */
322 descs[6].ptr = gba->memory.bios;
323 descs[6].start = BASE_BIOS;
324 descs[6].len = SIZE_BIOS;
325 descs[6].flags = RETRO_MEMDESC_CONST;
326
327 /* Map VRAM */
328 descs[7].ptr = gba->video.vram;
329 descs[7].start = BASE_VRAM;
330 descs[7].len = SIZE_VRAM;
331 descs[7].select = 0xFF000000;
332
333 /* Map palette RAM */
334 descs[8].ptr = gba->video.palette;
335 descs[8].start = BASE_PALETTE_RAM;
336 descs[8].len = SIZE_PALETTE_RAM;
337 descs[8].select = 0xFF000000;
338
339 /* Map OAM */
340 descs[9].ptr = &gba->video.oam; /* video.oam is a structure */
341 descs[9].start = BASE_OAM;
342 descs[9].len = SIZE_OAM;
343 descs[9].select = 0xFF000000;
344
345 /* Map mmapped I/O */
346 descs[10].ptr = gba->memory.io;
347 descs[10].start = BASE_IO;
348 descs[10].len = SIZE_IO;
349
350 mmaps.descriptors = descs;
351 mmaps.num_descriptors = sizeof(descs) / sizeof(descs[0]);
352
353 bool yes = true;
354 environCallback(RETRO_ENVIRONMENT_SET_MEMORY_MAPS, &mmaps);
355 environCallback(RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS, &yes);
356 }
357#endif
358}
359
360void retro_reset(void) {
361 core->reset(core);
362 _setupMaps(core);
363
364 if (rumbleCallback) {
365 CircleBufferClear(&rumbleHistory);
366 }
367}
368
369bool retro_load_game(const struct retro_game_info* game) {
370 struct VFile* rom;
371 if (game->data) {
372 data = anonymousMemoryMap(game->size);
373 dataSize = game->size;
374 memcpy(data, game->data, game->size);
375 rom = VFileFromMemory(data, game->size);
376 } else {
377 data = 0;
378 rom = VFileOpen(game->path, O_RDONLY);
379 }
380 if (!rom) {
381 return false;
382 }
383
384 core = mCoreFindVF(rom);
385 if (!core) {
386 rom->close(rom);
387 mappedMemoryFree(data, game->size);
388 return false;
389 }
390 mCoreInitConfig(core, NULL);
391 core->init(core);
392 core->setAVStream(core, &stream);
393
394 outputBuffer = malloc(256 * 224 * BYTES_PER_PIXEL);
395 core->setVideoBuffer(core, outputBuffer, 256);
396
397 core->setAudioBufferSize(core, SAMPLES);
398
399 blip_set_rates(core->getAudioChannel(core, 0), core->frequency(core), 32768);
400 blip_set_rates(core->getAudioChannel(core, 1), core->frequency(core), 32768);
401
402 core->setPeripheral(core, mPERIPH_RUMBLE, &rumble);
403
404 savedata = anonymousMemoryMap(SIZE_CART_FLASH1M);
405 struct VFile* save = VFileFromMemory(savedata, SIZE_CART_FLASH1M);
406
407 _reloadSettings();
408 core->loadROM(core, rom);
409 core->loadSave(core, save);
410
411#ifdef M_CORE_GBA
412 if (core->platform(core) == PLATFORM_GBA) {
413 core->setPeripheral(core, mPERIPH_GBA_LUMINANCE, &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 core->stateSize(core);
447}
448
449bool retro_serialize(void* data, size_t size) {
450 if (size != retro_serialize_size()) {
451 return false;
452 }
453 core->saveState(core, 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 core->loadState(core, 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#ifdef M_CORE_GBA
528 if (core->platform(core) == PLATFORM_GBA) {
529 switch (((struct GBA*) core->board)->memory.savedata.type) {
530 case SAVEDATA_AUTODETECT:
531 case SAVEDATA_FLASH1M:
532 return SIZE_CART_FLASH1M;
533 case SAVEDATA_FLASH512:
534 return SIZE_CART_FLASH512;
535 case SAVEDATA_EEPROM:
536 return SIZE_CART_EEPROM;
537 case SAVEDATA_SRAM:
538 return SIZE_CART_SRAM;
539 case SAVEDATA_FORCE_NONE:
540 return 0;
541 }
542 }
543#endif
544#ifdef M_CORE_GB
545 if (core->platform(core) == PLATFORM_GB) {
546 return ((struct GB*) core->board)->sramSize;
547 }
548#endif
549 return 0;
550}
551
552void GBARetroLog(struct mLogger* logger, int category, enum mLogLevel level, const char* format, va_list args) {
553 UNUSED(logger);
554 if (!logCallback) {
555 return;
556 }
557
558 char message[128];
559 vsnprintf(message, sizeof(message), format, args);
560
561 enum retro_log_level retroLevel = RETRO_LOG_INFO;
562 switch (level) {
563 case mLOG_ERROR:
564 case mLOG_FATAL:
565 retroLevel = RETRO_LOG_ERROR;
566 break;
567 case mLOG_WARN:
568 retroLevel = RETRO_LOG_WARN;
569 break;
570 case mLOG_INFO:
571 retroLevel = RETRO_LOG_INFO;
572 break;
573 case mLOG_GAME_ERROR:
574 case mLOG_STUB:
575#ifdef NDEBUG
576 return;
577#else
578 retroLevel = RETRO_LOG_DEBUG;
579 break;
580#endif
581 case mLOG_DEBUG:
582 retroLevel = RETRO_LOG_DEBUG;
583 break;
584 }
585#ifdef NDEBUG
586 static int biosCat = -1;
587 if (biosCat < 0) {
588 biosCat = mLogCategoryById("gba.bios");
589 }
590
591 if (category == biosCat) {
592 return;
593 }
594#endif
595 logCallback(retroLevel, "%s: %s\n", mLogCategoryName(category), message);
596}
597
598static void _postAudioBuffer(struct mAVStream* stream, blip_t* left, blip_t* right) {
599 UNUSED(stream);
600 int16_t samples[SAMPLES * 2];
601 blip_read_samples(left, samples, SAMPLES, true);
602 blip_read_samples(right, samples + 1, SAMPLES, true);
603 audioCallback(samples, SAMPLES);
604}
605
606static void _setRumble(struct mRumble* rumble, int enable) {
607 UNUSED(rumble);
608 if (!rumbleCallback) {
609 return;
610 }
611 rumbleLevel += enable;
612 if (CircleBufferSize(&rumbleHistory) == RUMBLE_PWM) {
613 int8_t oldLevel;
614 CircleBufferRead8(&rumbleHistory, &oldLevel);
615 rumbleLevel -= oldLevel;
616 }
617 CircleBufferWrite8(&rumbleHistory, enable);
618 rumbleCallback(0, RETRO_RUMBLE_STRONG, rumbleLevel * 0xFFFF / RUMBLE_PWM);
619 rumbleCallback(0, RETRO_RUMBLE_WEAK, rumbleLevel * 0xFFFF / RUMBLE_PWM);
620}
621
622static void _updateLux(struct GBALuminanceSource* lux) {
623 UNUSED(lux);
624 struct retro_variable var = {
625 .key = "mgba_solar_sensor_level",
626 .value = 0
627 };
628
629 bool updated = false;
630 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated) || !updated) {
631 return;
632 }
633 if (!environCallback(RETRO_ENVIRONMENT_GET_VARIABLE, &var) || !var.value) {
634 return;
635 }
636
637 char* end;
638 int newLuxLevel = strtol(var.value, &end, 10);
639 if (!*end) {
640 if (newLuxLevel > 10) {
641 luxLevel = 10;
642 } else if (newLuxLevel < 0) {
643 luxLevel = 0;
644 } else {
645 luxLevel = newLuxLevel;
646 }
647 }
648}
649
650static uint8_t _readLux(struct GBALuminanceSource* lux) {
651 UNUSED(lux);
652 int value = 0x16;
653 if (luxLevel > 0) {
654 value += GBA_LUX_LEVELS[luxLevel - 1];
655 }
656 return 0xFF - value;
657}