1 /* Copyright (C) 2010-2020 The RetroArch team 2 * 3 * --------------------------------------------------------------------------------------- 4 * The following license statement only applies to this libretro API header (libretro.h). 5 * --------------------------------------------------------------------------------------- 6 * 7 * Permission is hereby granted, free of charge, 8 * to any person obtaining a copy of this software and associated documentation files (the "Software"), 9 * to deal in the Software without restriction, including without limitation the rights to 10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, 11 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, 16 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 18 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 19 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 21 */ 22 23 #ifndef LIBRETRO_H__ 24 #define LIBRETRO_H__ 25 26 #include <stdint.h> 27 #include <stddef.h> 28 #include <limits.h> 29 30 #ifdef __cplusplus 31 extern "C" { 32 #endif 33 34 #ifndef __cplusplus 35 #if defined(_MSC_VER) && _MSC_VER < 1800 && !defined(SN_TARGET_PS3) 36 /* Hack applied for MSVC when compiling in C89 mode 37 * as it isn't C99-compliant. */ 38 #define bool unsigned char 39 #define true 1 40 #define false 0 41 #else 42 #include <stdbool.h> 43 #endif 44 #endif 45 46 #ifndef RETRO_CALLCONV 47 # if defined(__GNUC__) && defined(__i386__) && !defined(__x86_64__) 48 # define RETRO_CALLCONV __attribute__((cdecl)) 49 # elif defined(_MSC_VER) && defined(_M_X86) && !defined(_M_X64) 50 # define RETRO_CALLCONV __cdecl 51 # else 52 # define RETRO_CALLCONV /* all other platforms only have one calling convention each */ 53 # endif 54 #endif 55 56 #ifndef RETRO_API 57 # if defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__) 58 # ifdef RETRO_IMPORT_SYMBOLS 59 # ifdef __GNUC__ 60 # define RETRO_API RETRO_CALLCONV __attribute__((__dllimport__)) 61 # else 62 # define RETRO_API RETRO_CALLCONV __declspec(dllimport) 63 # endif 64 # else 65 # ifdef __GNUC__ 66 # define RETRO_API RETRO_CALLCONV __attribute__((__dllexport__)) 67 # else 68 # define RETRO_API RETRO_CALLCONV __declspec(dllexport) 69 # endif 70 # endif 71 # else 72 # if defined(__GNUC__) && __GNUC__ >= 4 73 # define RETRO_API RETRO_CALLCONV __attribute__((__visibility__("default"))) 74 # else 75 # define RETRO_API RETRO_CALLCONV 76 # endif 77 # endif 78 #endif 79 80 /* Used for checking API/ABI mismatches that can break libretro 81 * implementations. 82 * It is not incremented for compatible changes to the API. 83 */ 84 #define RETRO_API_VERSION 1 85 86 /* 87 * Libretro's fundamental device abstractions. 88 * 89 * Libretro's input system consists of some standardized device types, 90 * such as a joypad (with/without analog), mouse, keyboard, lightgun 91 * and a pointer. 92 * 93 * The functionality of these devices are fixed, and individual cores 94 * map their own concept of a controller to libretro's abstractions. 95 * This makes it possible for frontends to map the abstract types to a 96 * real input device, and not having to worry about binding input 97 * correctly to arbitrary controller layouts. 98 */ 99 100 #define RETRO_DEVICE_TYPE_SHIFT 8 101 #define RETRO_DEVICE_MASK ((1 << RETRO_DEVICE_TYPE_SHIFT) - 1) 102 #define RETRO_DEVICE_SUBCLASS(base, id) (((id + 1) << RETRO_DEVICE_TYPE_SHIFT) | base) 103 104 /* Input disabled. */ 105 #define RETRO_DEVICE_NONE 0 106 107 /* The JOYPAD is called RetroPad. It is essentially a Super Nintendo 108 * controller, but with additional L2/R2/L3/R3 buttons, similar to a 109 * PS1 DualShock. */ 110 #define RETRO_DEVICE_JOYPAD 1 111 112 /* The mouse is a simple mouse, similar to Super Nintendo's mouse. 113 * X and Y coordinates are reported relatively to last poll (poll callback). 114 * It is up to the libretro implementation to keep track of where the mouse 115 * pointer is supposed to be on the screen. 116 * The frontend must make sure not to interfere with its own hardware 117 * mouse pointer. 118 */ 119 #define RETRO_DEVICE_MOUSE 2 120 121 /* KEYBOARD device lets one poll for raw key pressed. 122 * It is poll based, so input callback will return with the current 123 * pressed state. 124 * For event/text based keyboard input, see 125 * RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK. 126 */ 127 #define RETRO_DEVICE_KEYBOARD 3 128 129 /* LIGHTGUN device is similar to Guncon-2 for PlayStation 2. 130 * It reports X/Y coordinates in screen space (similar to the pointer) 131 * in the range [-0x8000, 0x7fff] in both axes, with zero being center and 132 * -0x8000 being out of bounds. 133 * As well as reporting on/off screen state. It features a trigger, 134 * start/select buttons, auxiliary action buttons and a 135 * directional pad. A forced off-screen shot can be requested for 136 * auto-reloading function in some games. 137 */ 138 #define RETRO_DEVICE_LIGHTGUN 4 139 140 /* The ANALOG device is an extension to JOYPAD (RetroPad). 141 * Similar to DualShock2 it adds two analog sticks and all buttons can 142 * be analog. This is treated as a separate device type as it returns 143 * axis values in the full analog range of [-0x7fff, 0x7fff], 144 * although some devices may return -0x8000. 145 * Positive X axis is right. Positive Y axis is down. 146 * Buttons are returned in the range [0, 0x7fff]. 147 * Only use ANALOG type when polling for analog values. 148 */ 149 #define RETRO_DEVICE_ANALOG 5 150 151 /* Abstracts the concept of a pointing mechanism, e.g. touch. 152 * This allows libretro to query in absolute coordinates where on the 153 * screen a mouse (or something similar) is being placed. 154 * For a touch centric device, coordinates reported are the coordinates 155 * of the press. 156 * 157 * Coordinates in X and Y are reported as: 158 * [-0x7fff, 0x7fff]: -0x7fff corresponds to the far left/top of the screen, 159 * and 0x7fff corresponds to the far right/bottom of the screen. 160 * The "screen" is here defined as area that is passed to the frontend and 161 * later displayed on the monitor. 162 * 163 * The frontend is free to scale/resize this screen as it sees fit, however, 164 * (X, Y) = (-0x7fff, -0x7fff) will correspond to the top-left pixel of the 165 * game image, etc. 166 * 167 * To check if the pointer coordinates are valid (e.g. a touch display 168 * actually being touched), PRESSED returns 1 or 0. 169 * 170 * If using a mouse on a desktop, PRESSED will usually correspond to the 171 * left mouse button, but this is a frontend decision. 172 * PRESSED will only return 1 if the pointer is inside the game screen. 173 * 174 * For multi-touch, the index variable can be used to successively query 175 * more presses. 176 * If index = 0 returns true for _PRESSED, coordinates can be extracted 177 * with _X, _Y for index = 0. One can then query _PRESSED, _X, _Y with 178 * index = 1, and so on. 179 * Eventually _PRESSED will return false for an index. No further presses 180 * are registered at this point. */ 181 #define RETRO_DEVICE_POINTER 6 182 183 /* Buttons for the RetroPad (JOYPAD). 184 * The placement of these is equivalent to placements on the 185 * Super Nintendo controller. 186 * L2/R2/L3/R3 buttons correspond to the PS1 DualShock. 187 * Also used as id values for RETRO_DEVICE_INDEX_ANALOG_BUTTON */ 188 #define RETRO_DEVICE_ID_JOYPAD_B 0 189 #define RETRO_DEVICE_ID_JOYPAD_Y 1 190 #define RETRO_DEVICE_ID_JOYPAD_SELECT 2 191 #define RETRO_DEVICE_ID_JOYPAD_START 3 192 #define RETRO_DEVICE_ID_JOYPAD_UP 4 193 #define RETRO_DEVICE_ID_JOYPAD_DOWN 5 194 #define RETRO_DEVICE_ID_JOYPAD_LEFT 6 195 #define RETRO_DEVICE_ID_JOYPAD_RIGHT 7 196 #define RETRO_DEVICE_ID_JOYPAD_A 8 197 #define RETRO_DEVICE_ID_JOYPAD_X 9 198 #define RETRO_DEVICE_ID_JOYPAD_L 10 199 #define RETRO_DEVICE_ID_JOYPAD_R 11 200 #define RETRO_DEVICE_ID_JOYPAD_L2 12 201 #define RETRO_DEVICE_ID_JOYPAD_R2 13 202 #define RETRO_DEVICE_ID_JOYPAD_L3 14 203 #define RETRO_DEVICE_ID_JOYPAD_R3 15 204 205 #define RETRO_DEVICE_ID_JOYPAD_MASK 256 206 207 /* Index / Id values for ANALOG device. */ 208 #define RETRO_DEVICE_INDEX_ANALOG_LEFT 0 209 #define RETRO_DEVICE_INDEX_ANALOG_RIGHT 1 210 #define RETRO_DEVICE_INDEX_ANALOG_BUTTON 2 211 #define RETRO_DEVICE_ID_ANALOG_X 0 212 #define RETRO_DEVICE_ID_ANALOG_Y 1 213 214 /* Id values for MOUSE. */ 215 #define RETRO_DEVICE_ID_MOUSE_X 0 216 #define RETRO_DEVICE_ID_MOUSE_Y 1 217 #define RETRO_DEVICE_ID_MOUSE_LEFT 2 218 #define RETRO_DEVICE_ID_MOUSE_RIGHT 3 219 #define RETRO_DEVICE_ID_MOUSE_WHEELUP 4 220 #define RETRO_DEVICE_ID_MOUSE_WHEELDOWN 5 221 #define RETRO_DEVICE_ID_MOUSE_MIDDLE 6 222 #define RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELUP 7 223 #define RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELDOWN 8 224 #define RETRO_DEVICE_ID_MOUSE_BUTTON_4 9 225 #define RETRO_DEVICE_ID_MOUSE_BUTTON_5 10 226 227 /* Id values for LIGHTGUN. */ 228 #define RETRO_DEVICE_ID_LIGHTGUN_SCREEN_X 13 /*Absolute Position*/ 229 #define RETRO_DEVICE_ID_LIGHTGUN_SCREEN_Y 14 /*Absolute*/ 230 #define RETRO_DEVICE_ID_LIGHTGUN_IS_OFFSCREEN 15 /*Status Check*/ 231 #define RETRO_DEVICE_ID_LIGHTGUN_TRIGGER 2 232 #define RETRO_DEVICE_ID_LIGHTGUN_RELOAD 16 /*Forced off-screen shot*/ 233 #define RETRO_DEVICE_ID_LIGHTGUN_AUX_A 3 234 #define RETRO_DEVICE_ID_LIGHTGUN_AUX_B 4 235 #define RETRO_DEVICE_ID_LIGHTGUN_START 6 236 #define RETRO_DEVICE_ID_LIGHTGUN_SELECT 7 237 #define RETRO_DEVICE_ID_LIGHTGUN_AUX_C 8 238 #define RETRO_DEVICE_ID_LIGHTGUN_DPAD_UP 9 239 #define RETRO_DEVICE_ID_LIGHTGUN_DPAD_DOWN 10 240 #define RETRO_DEVICE_ID_LIGHTGUN_DPAD_LEFT 11 241 #define RETRO_DEVICE_ID_LIGHTGUN_DPAD_RIGHT 12 242 /* deprecated */ 243 #define RETRO_DEVICE_ID_LIGHTGUN_X 0 /*Relative Position*/ 244 #define RETRO_DEVICE_ID_LIGHTGUN_Y 1 /*Relative*/ 245 #define RETRO_DEVICE_ID_LIGHTGUN_CURSOR 3 /*Use Aux:A*/ 246 #define RETRO_DEVICE_ID_LIGHTGUN_TURBO 4 /*Use Aux:B*/ 247 #define RETRO_DEVICE_ID_LIGHTGUN_PAUSE 5 /*Use Start*/ 248 249 /* Id values for POINTER. */ 250 #define RETRO_DEVICE_ID_POINTER_X 0 251 #define RETRO_DEVICE_ID_POINTER_Y 1 252 #define RETRO_DEVICE_ID_POINTER_PRESSED 2 253 #define RETRO_DEVICE_ID_POINTER_COUNT 3 254 255 /* Returned from retro_get_region(). */ 256 #define RETRO_REGION_NTSC 0 257 #define RETRO_REGION_PAL 1 258 259 /* Id values for LANGUAGE */ 260 enum retro_language 261 { 262 RETRO_LANGUAGE_ENGLISH = 0, 263 RETRO_LANGUAGE_JAPANESE = 1, 264 RETRO_LANGUAGE_FRENCH = 2, 265 RETRO_LANGUAGE_SPANISH = 3, 266 RETRO_LANGUAGE_GERMAN = 4, 267 RETRO_LANGUAGE_ITALIAN = 5, 268 RETRO_LANGUAGE_DUTCH = 6, 269 RETRO_LANGUAGE_PORTUGUESE_BRAZIL = 7, 270 RETRO_LANGUAGE_PORTUGUESE_PORTUGAL = 8, 271 RETRO_LANGUAGE_RUSSIAN = 9, 272 RETRO_LANGUAGE_KOREAN = 10, 273 RETRO_LANGUAGE_CHINESE_TRADITIONAL = 11, 274 RETRO_LANGUAGE_CHINESE_SIMPLIFIED = 12, 275 RETRO_LANGUAGE_ESPERANTO = 13, 276 RETRO_LANGUAGE_POLISH = 14, 277 RETRO_LANGUAGE_VIETNAMESE = 15, 278 RETRO_LANGUAGE_ARABIC = 16, 279 RETRO_LANGUAGE_GREEK = 17, 280 RETRO_LANGUAGE_TURKISH = 18, 281 RETRO_LANGUAGE_SLOVAK = 19, 282 RETRO_LANGUAGE_PERSIAN = 20, 283 RETRO_LANGUAGE_HEBREW = 21, 284 RETRO_LANGUAGE_ASTURIAN = 22, 285 RETRO_LANGUAGE_LAST, 286 287 /* Ensure sizeof(enum) == sizeof(int) */ 288 RETRO_LANGUAGE_DUMMY = INT_MAX 289 }; 290 291 /* Passed to retro_get_memory_data/size(). 292 * If the memory type doesn't apply to the 293 * implementation NULL/0 can be returned. 294 */ 295 #define RETRO_MEMORY_MASK 0xff 296 297 /* Regular save RAM. This RAM is usually found on a game cartridge, 298 * backed up by a battery. 299 * If save game data is too complex for a single memory buffer, 300 * the SAVE_DIRECTORY (preferably) or SYSTEM_DIRECTORY environment 301 * callback can be used. */ 302 #define RETRO_MEMORY_SAVE_RAM 0 303 304 /* Some games have a built-in clock to keep track of time. 305 * This memory is usually just a couple of bytes to keep track of time. 306 */ 307 #define RETRO_MEMORY_RTC 1 308 309 /* System ram lets a frontend peek into a game systems main RAM. */ 310 #define RETRO_MEMORY_SYSTEM_RAM 2 311 312 /* Video ram lets a frontend peek into a game systems video RAM (VRAM). */ 313 #define RETRO_MEMORY_VIDEO_RAM 3 314 315 /* Keysyms used for ID in input state callback when polling RETRO_KEYBOARD. */ 316 enum retro_key 317 { 318 RETROK_UNKNOWN = 0, 319 RETROK_FIRST = 0, 320 RETROK_BACKSPACE = 8, 321 RETROK_TAB = 9, 322 RETROK_CLEAR = 12, 323 RETROK_RETURN = 13, 324 RETROK_PAUSE = 19, 325 RETROK_ESCAPE = 27, 326 RETROK_SPACE = 32, 327 RETROK_EXCLAIM = 33, 328 RETROK_QUOTEDBL = 34, 329 RETROK_HASH = 35, 330 RETROK_DOLLAR = 36, 331 RETROK_AMPERSAND = 38, 332 RETROK_QUOTE = 39, 333 RETROK_LEFTPAREN = 40, 334 RETROK_RIGHTPAREN = 41, 335 RETROK_ASTERISK = 42, 336 RETROK_PLUS = 43, 337 RETROK_COMMA = 44, 338 RETROK_MINUS = 45, 339 RETROK_PERIOD = 46, 340 RETROK_SLASH = 47, 341 RETROK_0 = 48, 342 RETROK_1 = 49, 343 RETROK_2 = 50, 344 RETROK_3 = 51, 345 RETROK_4 = 52, 346 RETROK_5 = 53, 347 RETROK_6 = 54, 348 RETROK_7 = 55, 349 RETROK_8 = 56, 350 RETROK_9 = 57, 351 RETROK_COLON = 58, 352 RETROK_SEMICOLON = 59, 353 RETROK_LESS = 60, 354 RETROK_EQUALS = 61, 355 RETROK_GREATER = 62, 356 RETROK_QUESTION = 63, 357 RETROK_AT = 64, 358 RETROK_LEFTBRACKET = 91, 359 RETROK_BACKSLASH = 92, 360 RETROK_RIGHTBRACKET = 93, 361 RETROK_CARET = 94, 362 RETROK_UNDERSCORE = 95, 363 RETROK_BACKQUOTE = 96, 364 RETROK_a = 97, 365 RETROK_b = 98, 366 RETROK_c = 99, 367 RETROK_d = 100, 368 RETROK_e = 101, 369 RETROK_f = 102, 370 RETROK_g = 103, 371 RETROK_h = 104, 372 RETROK_i = 105, 373 RETROK_j = 106, 374 RETROK_k = 107, 375 RETROK_l = 108, 376 RETROK_m = 109, 377 RETROK_n = 110, 378 RETROK_o = 111, 379 RETROK_p = 112, 380 RETROK_q = 113, 381 RETROK_r = 114, 382 RETROK_s = 115, 383 RETROK_t = 116, 384 RETROK_u = 117, 385 RETROK_v = 118, 386 RETROK_w = 119, 387 RETROK_x = 120, 388 RETROK_y = 121, 389 RETROK_z = 122, 390 RETROK_LEFTBRACE = 123, 391 RETROK_BAR = 124, 392 RETROK_RIGHTBRACE = 125, 393 RETROK_TILDE = 126, 394 RETROK_DELETE = 127, 395 396 RETROK_KP0 = 256, 397 RETROK_KP1 = 257, 398 RETROK_KP2 = 258, 399 RETROK_KP3 = 259, 400 RETROK_KP4 = 260, 401 RETROK_KP5 = 261, 402 RETROK_KP6 = 262, 403 RETROK_KP7 = 263, 404 RETROK_KP8 = 264, 405 RETROK_KP9 = 265, 406 RETROK_KP_PERIOD = 266, 407 RETROK_KP_DIVIDE = 267, 408 RETROK_KP_MULTIPLY = 268, 409 RETROK_KP_MINUS = 269, 410 RETROK_KP_PLUS = 270, 411 RETROK_KP_ENTER = 271, 412 RETROK_KP_EQUALS = 272, 413 414 RETROK_UP = 273, 415 RETROK_DOWN = 274, 416 RETROK_RIGHT = 275, 417 RETROK_LEFT = 276, 418 RETROK_INSERT = 277, 419 RETROK_HOME = 278, 420 RETROK_END = 279, 421 RETROK_PAGEUP = 280, 422 RETROK_PAGEDOWN = 281, 423 424 RETROK_F1 = 282, 425 RETROK_F2 = 283, 426 RETROK_F3 = 284, 427 RETROK_F4 = 285, 428 RETROK_F5 = 286, 429 RETROK_F6 = 287, 430 RETROK_F7 = 288, 431 RETROK_F8 = 289, 432 RETROK_F9 = 290, 433 RETROK_F10 = 291, 434 RETROK_F11 = 292, 435 RETROK_F12 = 293, 436 RETROK_F13 = 294, 437 RETROK_F14 = 295, 438 RETROK_F15 = 296, 439 440 RETROK_NUMLOCK = 300, 441 RETROK_CAPSLOCK = 301, 442 RETROK_SCROLLOCK = 302, 443 RETROK_RSHIFT = 303, 444 RETROK_LSHIFT = 304, 445 RETROK_RCTRL = 305, 446 RETROK_LCTRL = 306, 447 RETROK_RALT = 307, 448 RETROK_LALT = 308, 449 RETROK_RMETA = 309, 450 RETROK_LMETA = 310, 451 RETROK_LSUPER = 311, 452 RETROK_RSUPER = 312, 453 RETROK_MODE = 313, 454 RETROK_COMPOSE = 314, 455 456 RETROK_HELP = 315, 457 RETROK_PRINT = 316, 458 RETROK_SYSREQ = 317, 459 RETROK_BREAK = 318, 460 RETROK_MENU = 319, 461 RETROK_POWER = 320, 462 RETROK_EURO = 321, 463 RETROK_UNDO = 322, 464 RETROK_OEM_102 = 323, 465 466 RETROK_LAST, 467 468 RETROK_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */ 469 }; 470 471 enum retro_mod 472 { 473 RETROKMOD_NONE = 0x0000, 474 475 RETROKMOD_SHIFT = 0x01, 476 RETROKMOD_CTRL = 0x02, 477 RETROKMOD_ALT = 0x04, 478 RETROKMOD_META = 0x08, 479 480 RETROKMOD_NUMLOCK = 0x10, 481 RETROKMOD_CAPSLOCK = 0x20, 482 RETROKMOD_SCROLLOCK = 0x40, 483 484 RETROKMOD_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */ 485 }; 486 487 /* If set, this call is not part of the public libretro API yet. It can 488 * change or be removed at any time. */ 489 #define RETRO_ENVIRONMENT_EXPERIMENTAL 0x10000 490 /* Environment callback to be used internally in frontend. */ 491 #define RETRO_ENVIRONMENT_PRIVATE 0x20000 492 493 /* Environment commands. */ 494 #define RETRO_ENVIRONMENT_SET_ROTATION 1 /* const unsigned * -- 495 * Sets screen rotation of graphics. 496 * Valid values are 0, 1, 2, 3, which rotates screen by 0, 90, 180, 497 * 270 degrees counter-clockwise respectively. 498 */ 499 #define RETRO_ENVIRONMENT_GET_OVERSCAN 2 /* bool * -- 500 * NOTE: As of 2019 this callback is considered deprecated in favor of 501 * using core options to manage overscan in a more nuanced, core-specific way. 502 * 503 * Boolean value whether or not the implementation should use overscan, 504 * or crop away overscan. 505 */ 506 #define RETRO_ENVIRONMENT_GET_CAN_DUPE 3 /* bool * -- 507 * Boolean value whether or not frontend supports frame duping, 508 * passing NULL to video frame callback. 509 */ 510 511 /* Environ 4, 5 are no longer supported (GET_VARIABLE / SET_VARIABLES), 512 * and reserved to avoid possible ABI clash. 513 */ 514 515 #define RETRO_ENVIRONMENT_SET_MESSAGE 6 /* const struct retro_message * -- 516 * Sets a message to be displayed in implementation-specific manner 517 * for a certain amount of 'frames'. 518 * Should not be used for trivial messages, which should simply be 519 * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a 520 * fallback, stderr). 521 */ 522 #define RETRO_ENVIRONMENT_SHUTDOWN 7 /* N/A (NULL) -- 523 * Requests the frontend to shutdown. 524 * Should only be used if game has a specific 525 * way to shutdown the game from a menu item or similar. 526 */ 527 #define RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL 8 528 /* const unsigned * -- 529 * Gives a hint to the frontend how demanding this implementation 530 * is on a system. E.g. reporting a level of 2 means 531 * this implementation should run decently on all frontends 532 * of level 2 and up. 533 * 534 * It can be used by the frontend to potentially warn 535 * about too demanding implementations. 536 * 537 * The levels are "floating". 538 * 539 * This function can be called on a per-game basis, 540 * as certain games an implementation can play might be 541 * particularly demanding. 542 * If called, it should be called in retro_load_game(). 543 */ 544 #define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9 545 /* const char ** -- 546 * Returns the "system" directory of the frontend. 547 * This directory can be used to store system specific 548 * content such as BIOSes, configuration data, etc. 549 * The returned value can be NULL. 550 * If so, no such directory is defined, 551 * and it's up to the implementation to find a suitable directory. 552 * 553 * NOTE: Some cores used this folder also for "save" data such as 554 * memory cards, etc, for lack of a better place to put it. 555 * This is now discouraged, and if possible, cores should try to 556 * use the new GET_SAVE_DIRECTORY. 557 */ 558 #define RETRO_ENVIRONMENT_SET_PIXEL_FORMAT 10 559 /* const enum retro_pixel_format * -- 560 * Sets the internal pixel format used by the implementation. 561 * The default pixel format is RETRO_PIXEL_FORMAT_0RGB1555. 562 * This pixel format however, is deprecated (see enum retro_pixel_format). 563 * If the call returns false, the frontend does not support this pixel 564 * format. 565 * 566 * This function should be called inside retro_load_game() or 567 * retro_get_system_av_info(). 568 */ 569 #define RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS 11 570 /* const struct retro_input_descriptor * -- 571 * Sets an array of retro_input_descriptors. 572 * It is up to the frontend to present this in a usable way. 573 * The array is terminated by retro_input_descriptor::description 574 * being set to NULL. 575 * This function can be called at any time, but it is recommended 576 * to call it as early as possible. 577 */ 578 #define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12 579 /* const struct retro_keyboard_callback * -- 580 * Sets a callback function used to notify core about keyboard events. 581 */ 582 #define RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE 13 583 /* const struct retro_disk_control_callback * -- 584 * Sets an interface which frontend can use to eject and insert 585 * disk images. 586 * This is used for games which consist of multiple images and 587 * must be manually swapped out by the user (e.g. PSX). 588 */ 589 #define RETRO_ENVIRONMENT_SET_HW_RENDER 14 590 /* struct retro_hw_render_callback * -- 591 * Sets an interface to let a libretro core render with 592 * hardware acceleration. 593 * Should be called in retro_load_game(). 594 * If successful, libretro cores will be able to render to a 595 * frontend-provided framebuffer. 596 * The size of this framebuffer will be at least as large as 597 * max_width/max_height provided in get_av_info(). 598 * If HW rendering is used, pass only RETRO_HW_FRAME_BUFFER_VALID or 599 * NULL to retro_video_refresh_t. 600 */ 601 #define RETRO_ENVIRONMENT_GET_VARIABLE 15 602 /* struct retro_variable * -- 603 * Interface to acquire user-defined information from environment 604 * that cannot feasibly be supported in a multi-system way. 605 * 'key' should be set to a key which has already been set by 606 * SET_VARIABLES. 607 * 'data' will be set to a value or NULL. 608 */ 609 #define RETRO_ENVIRONMENT_SET_VARIABLES 16 610 /* const struct retro_variable * -- 611 * Allows an implementation to signal the environment 612 * which variables it might want to check for later using 613 * GET_VARIABLE. 614 * This allows the frontend to present these variables to 615 * a user dynamically. 616 * This should be called the first time as early as 617 * possible (ideally in retro_set_environment). 618 * Afterward it may be called again for the core to communicate 619 * updated options to the frontend, but the number of core 620 * options must not change from the number in the initial call. 621 * 622 * 'data' points to an array of retro_variable structs 623 * terminated by a { NULL, NULL } element. 624 * retro_variable::key should be namespaced to not collide 625 * with other implementations' keys. E.g. A core called 626 * 'foo' should use keys named as 'foo_option'. 627 * retro_variable::value should contain a human readable 628 * description of the key as well as a '|' delimited list 629 * of expected values. 630 * 631 * The number of possible options should be very limited, 632 * i.e. it should be feasible to cycle through options 633 * without a keyboard. 634 * 635 * First entry should be treated as a default. 636 * 637 * Example entry: 638 * { "foo_option", "Speed hack coprocessor X; false|true" } 639 * 640 * Text before first ';' is description. This ';' must be 641 * followed by a space, and followed by a list of possible 642 * values split up with '|'. 643 * 644 * Only strings are operated on. The possible values will 645 * generally be displayed and stored as-is by the frontend. 646 */ 647 #define RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE 17 648 /* bool * -- 649 * Result is set to true if some variables are updated by 650 * frontend since last call to RETRO_ENVIRONMENT_GET_VARIABLE. 651 * Variables should be queried with GET_VARIABLE. 652 */ 653 #define RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME 18 654 /* const bool * -- 655 * If true, the libretro implementation supports calls to 656 * retro_load_game() with NULL as argument. 657 * Used by cores which can run without particular game data. 658 * This should be called within retro_set_environment() only. 659 */ 660 #define RETRO_ENVIRONMENT_GET_LIBRETRO_PATH 19 661 /* const char ** -- 662 * Retrieves the absolute path from where this libretro 663 * implementation was loaded. 664 * NULL is returned if the libretro was loaded statically 665 * (i.e. linked statically to frontend), or if the path cannot be 666 * determined. 667 * Mostly useful in cooperation with SET_SUPPORT_NO_GAME as assets can 668 * be loaded without ugly hacks. 669 */ 670 671 /* Environment 20 was an obsolete version of SET_AUDIO_CALLBACK. 672 * It was not used by any known core at the time, 673 * and was removed from the API. */ 674 #define RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK 21 675 /* const struct retro_frame_time_callback * -- 676 * Lets the core know how much time has passed since last 677 * invocation of retro_run(). 678 * The frontend can tamper with the timing to fake fast-forward, 679 * slow-motion, frame stepping, etc. 680 * In this case the delta time will use the reference value 681 * in frame_time_callback.. 682 */ 683 #define RETRO_ENVIRONMENT_SET_AUDIO_CALLBACK 22 684 /* const struct retro_audio_callback * -- 685 * Sets an interface which is used to notify a libretro core about audio 686 * being available for writing. 687 * The callback can be called from any thread, so a core using this must 688 * have a thread safe audio implementation. 689 * It is intended for games where audio and video are completely 690 * asynchronous and audio can be generated on the fly. 691 * This interface is not recommended for use with emulators which have 692 * highly synchronous audio. 693 * 694 * The callback only notifies about writability; the libretro core still 695 * has to call the normal audio callbacks 696 * to write audio. The audio callbacks must be called from within the 697 * notification callback. 698 * The amount of audio data to write is up to the implementation. 699 * Generally, the audio callback will be called continously in a loop. 700 * 701 * Due to thread safety guarantees and lack of sync between audio and 702 * video, a frontend can selectively disallow this interface based on 703 * internal configuration. A core using this interface must also 704 * implement the "normal" audio interface. 705 * 706 * A libretro core using SET_AUDIO_CALLBACK should also make use of 707 * SET_FRAME_TIME_CALLBACK. 708 */ 709 #define RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE 23 710 /* struct retro_rumble_interface * -- 711 * Gets an interface which is used by a libretro core to set 712 * state of rumble motors in controllers. 713 * A strong and weak motor is supported, and they can be 714 * controlled indepedently. 715 */ 716 #define RETRO_ENVIRONMENT_GET_INPUT_DEVICE_CAPABILITIES 24 717 /* uint64_t * -- 718 * Gets a bitmask telling which device type are expected to be 719 * handled properly in a call to retro_input_state_t. 720 * Devices which are not handled or recognized always return 721 * 0 in retro_input_state_t. 722 * Example bitmask: caps = (1 << RETRO_DEVICE_JOYPAD) | (1 << RETRO_DEVICE_ANALOG). 723 * Should only be called in retro_run(). 724 */ 725 #define RETRO_ENVIRONMENT_GET_SENSOR_INTERFACE (25 | RETRO_ENVIRONMENT_EXPERIMENTAL) 726 /* struct retro_sensor_interface * -- 727 * Gets access to the sensor interface. 728 * The purpose of this interface is to allow 729 * setting state related to sensors such as polling rate, 730 * enabling/disable it entirely, etc. 731 * Reading sensor state is done via the normal 732 * input_state_callback API. 733 */ 734 #define RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE (26 | RETRO_ENVIRONMENT_EXPERIMENTAL) 735 /* struct retro_camera_callback * -- 736 * Gets an interface to a video camera driver. 737 * A libretro core can use this interface to get access to a 738 * video camera. 739 * New video frames are delivered in a callback in same 740 * thread as retro_run(). 741 * 742 * GET_CAMERA_INTERFACE should be called in retro_load_game(). 743 * 744 * Depending on the camera implementation used, camera frames 745 * will be delivered as a raw framebuffer, 746 * or as an OpenGL texture directly. 747 * 748 * The core has to tell the frontend here which types of 749 * buffers can be handled properly. 750 * An OpenGL texture can only be handled when using a 751 * libretro GL core (SET_HW_RENDER). 752 * It is recommended to use a libretro GL core when 753 * using camera interface. 754 * 755 * The camera is not started automatically. The retrieved start/stop 756 * functions must be used to explicitly 757 * start and stop the camera driver. 758 */ 759 #define RETRO_ENVIRONMENT_GET_LOG_INTERFACE 27 760 /* struct retro_log_callback * -- 761 * Gets an interface for logging. This is useful for 762 * logging in a cross-platform way 763 * as certain platforms cannot use stderr for logging. 764 * It also allows the frontend to 765 * show logging information in a more suitable way. 766 * If this interface is not used, libretro cores should 767 * log to stderr as desired. 768 */ 769 #define RETRO_ENVIRONMENT_GET_PERF_INTERFACE 28 770 /* struct retro_perf_callback * -- 771 * Gets an interface for performance counters. This is useful 772 * for performance logging in a cross-platform way and for detecting 773 * architecture-specific features, such as SIMD support. 774 */ 775 #define RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE 29 776 /* struct retro_location_callback * -- 777 * Gets access to the location interface. 778 * The purpose of this interface is to be able to retrieve 779 * location-based information from the host device, 780 * such as current latitude / longitude. 781 */ 782 #define RETRO_ENVIRONMENT_GET_CONTENT_DIRECTORY 30 /* Old name, kept for compatibility. */ 783 #define RETRO_ENVIRONMENT_GET_CORE_ASSETS_DIRECTORY 30 784 /* const char ** -- 785 * Returns the "core assets" directory of the frontend. 786 * This directory can be used to store specific assets that the 787 * core relies upon, such as art assets, 788 * input data, etc etc. 789 * The returned value can be NULL. 790 * If so, no such directory is defined, 791 * and it's up to the implementation to find a suitable directory. 792 */ 793 #define RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY 31 794 /* const char ** -- 795 * Returns the "save" directory of the frontend, unless there is no 796 * save directory available. The save directory should be used to 797 * store SRAM, memory cards, high scores, etc, if the libretro core 798 * cannot use the regular memory interface (retro_get_memory_data()). 799 * 800 * If the frontend cannot designate a save directory, it will return 801 * NULL to indicate that the core should attempt to operate without a 802 * save directory set. 803 * 804 * NOTE: early libretro cores used the system directory for save 805 * files. Cores that need to be backwards-compatible can still check 806 * GET_SYSTEM_DIRECTORY. 807 */ 808 #define RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO 32 809 /* const struct retro_system_av_info * -- 810 * Sets a new av_info structure. This can only be called from 811 * within retro_run(). 812 * This should *only* be used if the core is completely altering the 813 * internal resolutions, aspect ratios, timings, sampling rate, etc. 814 * Calling this can require a full reinitialization of video/audio 815 * drivers in the frontend, 816 * 817 * so it is important to call it very sparingly, and usually only with 818 * the users explicit consent. 819 * An eventual driver reinitialize will happen so that video and 820 * audio callbacks 821 * happening after this call within the same retro_run() call will 822 * target the newly initialized driver. 823 * 824 * This callback makes it possible to support configurable resolutions 825 * in games, which can be useful to 826 * avoid setting the "worst case" in max_width/max_height. 827 * 828 * ***HIGHLY RECOMMENDED*** Do not call this callback every time 829 * resolution changes in an emulator core if it's 830 * expected to be a temporary change, for the reasons of possible 831 * driver reinitialization. 832 * This call is not a free pass for not trying to provide 833 * correct values in retro_get_system_av_info(). If you need to change 834 * things like aspect ratio or nominal width/height, 835 * use RETRO_ENVIRONMENT_SET_GEOMETRY, which is a softer variant 836 * of SET_SYSTEM_AV_INFO. 837 * 838 * If this returns false, the frontend does not acknowledge a 839 * changed av_info struct. 840 */ 841 #define RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK 33 842 /* const struct retro_get_proc_address_interface * -- 843 * Allows a libretro core to announce support for the 844 * get_proc_address() interface. 845 * This interface allows for a standard way to extend libretro where 846 * use of environment calls are too indirect, 847 * e.g. for cases where the frontend wants to call directly into the core. 848 * 849 * If a core wants to expose this interface, SET_PROC_ADDRESS_CALLBACK 850 * **MUST** be called from within retro_set_environment(). 851 */ 852 #define RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO 34 853 /* const struct retro_subsystem_info * -- 854 * This environment call introduces the concept of libretro "subsystems". 855 * A subsystem is a variant of a libretro core which supports 856 * different kinds of games. 857 * The purpose of this is to support e.g. emulators which might 858 * have special needs, e.g. Super Nintendo's Super GameBoy, Sufami Turbo. 859 * It can also be used to pick among subsystems in an explicit way 860 * if the libretro implementation is a multi-system emulator itself. 861 * 862 * Loading a game via a subsystem is done with retro_load_game_special(), 863 * and this environment call allows a libretro core to expose which 864 * subsystems are supported for use with retro_load_game_special(). 865 * A core passes an array of retro_game_special_info which is terminated 866 * with a zeroed out retro_game_special_info struct. 867 * 868 * If a core wants to use this functionality, SET_SUBSYSTEM_INFO 869 * **MUST** be called from within retro_set_environment(). 870 */ 871 #define RETRO_ENVIRONMENT_SET_CONTROLLER_INFO 35 872 /* const struct retro_controller_info * -- 873 * This environment call lets a libretro core tell the frontend 874 * which controller subclasses are recognized in calls to 875 * retro_set_controller_port_device(). 876 * 877 * Some emulators such as Super Nintendo support multiple lightgun 878 * types which must be specifically selected from. It is therefore 879 * sometimes necessary for a frontend to be able to tell the core 880 * about a special kind of input device which is not specifcally 881 * provided by the Libretro API. 882 * 883 * In order for a frontend to understand the workings of those devices, 884 * they must be defined as a specialized subclass of the generic device 885 * types already defined in the libretro API. 886 * 887 * The core must pass an array of const struct retro_controller_info which 888 * is terminated with a blanked out struct. Each element of the 889 * retro_controller_info struct corresponds to the ascending port index 890 * that is passed to retro_set_controller_port_device() when that function 891 * is called to indicate to the core that the frontend has changed the 892 * active device subclass. SEE ALSO: retro_set_controller_port_device() 893 * 894 * The ascending input port indexes provided by the core in the struct 895 * are generally presented by frontends as ascending User # or Player #, 896 * such as Player 1, Player 2, Player 3, etc. Which device subclasses are 897 * supported can vary per input port. 898 * 899 * The first inner element of each entry in the retro_controller_info array 900 * is a retro_controller_description struct that specifies the names and 901 * codes of all device subclasses that are available for the corresponding 902 * User or Player, beginning with the generic Libretro device that the 903 * subclasses are derived from. The second inner element of each entry is the 904 * total number of subclasses that are listed in the retro_controller_description. 905 * 906 * NOTE: Even if special device types are set in the libretro core, 907 * libretro should only poll input based on the base input device types. 908 */ 909 #define RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL) 910 /* const struct retro_memory_map * -- 911 * This environment call lets a libretro core tell the frontend 912 * about the memory maps this core emulates. 913 * This can be used to implement, for example, cheats in a core-agnostic way. 914 * 915 * Should only be used by emulators; it doesn't make much sense for 916 * anything else. 917 * It is recommended to expose all relevant pointers through 918 * retro_get_memory_* as well. 919 * 920 * Can be called from retro_init and retro_load_game. 921 */ 922 #define RETRO_ENVIRONMENT_SET_GEOMETRY 37 923 /* const struct retro_game_geometry * -- 924 * This environment call is similar to SET_SYSTEM_AV_INFO for changing 925 * video parameters, but provides a guarantee that drivers will not be 926 * reinitialized. 927 * This can only be called from within retro_run(). 928 * 929 * The purpose of this call is to allow a core to alter nominal 930 * width/heights as well as aspect ratios on-the-fly, which can be 931 * useful for some emulators to change in run-time. 932 * 933 * max_width/max_height arguments are ignored and cannot be changed 934 * with this call as this could potentially require a reinitialization or a 935 * non-constant time operation. 936 * If max_width/max_height are to be changed, SET_SYSTEM_AV_INFO is required. 937 * 938 * A frontend must guarantee that this environment call completes in 939 * constant time. 940 */ 941 #define RETRO_ENVIRONMENT_GET_USERNAME 38 942 /* const char ** 943 * Returns the specified username of the frontend, if specified by the user. 944 * This username can be used as a nickname for a core that has online facilities 945 * or any other mode where personalization of the user is desirable. 946 * The returned value can be NULL. 947 * If this environ callback is used by a core that requires a valid username, 948 * a default username should be specified by the core. 949 */ 950 #define RETRO_ENVIRONMENT_GET_LANGUAGE 39 951 /* unsigned * -- 952 * Returns the specified language of the frontend, if specified by the user. 953 * It can be used by the core for localization purposes. 954 */ 955 #define RETRO_ENVIRONMENT_GET_CURRENT_SOFTWARE_FRAMEBUFFER (40 | RETRO_ENVIRONMENT_EXPERIMENTAL) 956 /* struct retro_framebuffer * -- 957 * Returns a preallocated framebuffer which the core can use for rendering 958 * the frame into when not using SET_HW_RENDER. 959 * The framebuffer returned from this call must not be used 960 * after the current call to retro_run() returns. 961 * 962 * The goal of this call is to allow zero-copy behavior where a core 963 * can render directly into video memory, avoiding extra bandwidth cost by copying 964 * memory from core to video memory. 965 * 966 * If this call succeeds and the core renders into it, 967 * the framebuffer pointer and pitch can be passed to retro_video_refresh_t. 968 * If the buffer from GET_CURRENT_SOFTWARE_FRAMEBUFFER is to be used, 969 * the core must pass the exact 970 * same pointer as returned by GET_CURRENT_SOFTWARE_FRAMEBUFFER; 971 * i.e. passing a pointer which is offset from the 972 * buffer is undefined. The width, height and pitch parameters 973 * must also match exactly to the values obtained from GET_CURRENT_SOFTWARE_FRAMEBUFFER. 974 * 975 * It is possible for a frontend to return a different pixel format 976 * than the one used in SET_PIXEL_FORMAT. This can happen if the frontend 977 * needs to perform conversion. 978 * 979 * It is still valid for a core to render to a different buffer 980 * even if GET_CURRENT_SOFTWARE_FRAMEBUFFER succeeds. 981 * 982 * A frontend must make sure that the pointer obtained from this function is 983 * writeable (and readable). 984 */ 985 #define RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE (41 | RETRO_ENVIRONMENT_EXPERIMENTAL) 986 /* const struct retro_hw_render_interface ** -- 987 * Returns an API specific rendering interface for accessing API specific data. 988 * Not all HW rendering APIs support or need this. 989 * The contents of the returned pointer is specific to the rendering API 990 * being used. See the various headers like libretro_vulkan.h, etc. 991 * 992 * GET_HW_RENDER_INTERFACE cannot be called before context_reset has been called. 993 * Similarly, after context_destroyed callback returns, 994 * the contents of the HW_RENDER_INTERFACE are invalidated. 995 */ 996 #define RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS (42 | RETRO_ENVIRONMENT_EXPERIMENTAL) 997 /* const bool * -- 998 * If true, the libretro implementation supports achievements 999 * either via memory descriptors set with RETRO_ENVIRONMENT_SET_MEMORY_MAPS 1000 * or via retro_get_memory_data/retro_get_memory_size. 1001 * 1002 * This must be called before the first call to retro_run. 1003 */ 1004 #define RETRO_ENVIRONMENT_SET_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE (43 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1005 /* const struct retro_hw_render_context_negotiation_interface * -- 1006 * Sets an interface which lets the libretro core negotiate with frontend how a context is created. 1007 * The semantics of this interface depends on which API is used in SET_HW_RENDER earlier. 1008 * This interface will be used when the frontend is trying to create a HW rendering context, 1009 * so it will be used after SET_HW_RENDER, but before the context_reset callback. 1010 */ 1011 #define RETRO_ENVIRONMENT_SET_SERIALIZATION_QUIRKS 44 1012 /* uint64_t * -- 1013 * Sets quirk flags associated with serialization. The frontend will zero any flags it doesn't 1014 * recognize or support. Should be set in either retro_init or retro_load_game, but not both. 1015 */ 1016 #define RETRO_ENVIRONMENT_SET_HW_SHARED_CONTEXT (44 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1017 /* N/A (null) * -- 1018 * The frontend will try to use a 'shared' hardware context (mostly applicable 1019 * to OpenGL) when a hardware context is being set up. 1020 * 1021 * Returns true if the frontend supports shared hardware contexts and false 1022 * if the frontend does not support shared hardware contexts. 1023 * 1024 * This will do nothing on its own until SET_HW_RENDER env callbacks are 1025 * being used. 1026 */ 1027 #define RETRO_ENVIRONMENT_GET_VFS_INTERFACE (45 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1028 /* struct retro_vfs_interface_info * -- 1029 * Gets access to the VFS interface. 1030 * VFS presence needs to be queried prior to load_game or any 1031 * get_system/save/other_directory being called to let front end know 1032 * core supports VFS before it starts handing out paths. 1033 * It is recomended to do so in retro_set_environment 1034 */ 1035 #define RETRO_ENVIRONMENT_GET_LED_INTERFACE (46 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1036 /* struct retro_led_interface * -- 1037 * Gets an interface which is used by a libretro core to set 1038 * state of LEDs. 1039 */ 1040 #define RETRO_ENVIRONMENT_GET_AUDIO_VIDEO_ENABLE (47 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1041 /* int * -- 1042 * Tells the core if the frontend wants audio or video. 1043 * If disabled, the frontend will discard the audio or video, 1044 * so the core may decide to skip generating a frame or generating audio. 1045 * This is mainly used for increasing performance. 1046 * Bit 0 (value 1): Enable Video 1047 * Bit 1 (value 2): Enable Audio 1048 * Bit 2 (value 4): Use Fast Savestates. 1049 * Bit 3 (value 8): Hard Disable Audio 1050 * Other bits are reserved for future use and will default to zero. 1051 * If video is disabled: 1052 * * The frontend wants the core to not generate any video, 1053 * including presenting frames via hardware acceleration. 1054 * * The frontend's video frame callback will do nothing. 1055 * * After running the frame, the video output of the next frame should be 1056 * no different than if video was enabled, and saving and loading state 1057 * should have no issues. 1058 * If audio is disabled: 1059 * * The frontend wants the core to not generate any audio. 1060 * * The frontend's audio callbacks will do nothing. 1061 * * After running the frame, the audio output of the next frame should be 1062 * no different than if audio was enabled, and saving and loading state 1063 * should have no issues. 1064 * Fast Savestates: 1065 * * Guaranteed to be created by the same binary that will load them. 1066 * * Will not be written to or read from the disk. 1067 * * Suggest that the core assumes loading state will succeed. 1068 * * Suggest that the core updates its memory buffers in-place if possible. 1069 * * Suggest that the core skips clearing memory. 1070 * * Suggest that the core skips resetting the system. 1071 * * Suggest that the core may skip validation steps. 1072 * Hard Disable Audio: 1073 * * Used for a secondary core when running ahead. 1074 * * Indicates that the frontend will never need audio from the core. 1075 * * Suggests that the core may stop synthesizing audio, but this should not 1076 * compromise emulation accuracy. 1077 * * Audio output for the next frame does not matter, and the frontend will 1078 * never need an accurate audio state in the future. 1079 * * State will never be saved when using Hard Disable Audio. 1080 */ 1081 #define RETRO_ENVIRONMENT_GET_MIDI_INTERFACE (48 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1082 /* struct retro_midi_interface ** -- 1083 * Returns a MIDI interface that can be used for raw data I/O. 1084 */ 1085 1086 #define RETRO_ENVIRONMENT_GET_FASTFORWARDING (49 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1087 /* bool * -- 1088 * Boolean value that indicates whether or not the frontend is in 1089 * fastforwarding mode. 1090 */ 1091 1092 #define RETRO_ENVIRONMENT_GET_TARGET_REFRESH_RATE (50 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1093 /* float * -- 1094 * Float value that lets us know what target refresh rate 1095 * is curently in use by the frontend. 1096 * 1097 * The core can use the returned value to set an ideal 1098 * refresh rate/framerate. 1099 */ 1100 1101 #define RETRO_ENVIRONMENT_GET_INPUT_BITMASKS (51 | RETRO_ENVIRONMENT_EXPERIMENTAL) 1102 /* bool * -- 1103 * Boolean value that indicates whether or not the frontend supports 1104 * input bitmasks being returned by retro_input_state_t. The advantage 1105 * of this is that retro_input_state_t has to be only called once to 1106 * grab all button states instead of multiple times. 1107 * 1108 * If it returns true, you can pass RETRO_DEVICE_ID_JOYPAD_MASK as 'id' 1109 * to retro_input_state_t (make sure 'device' is set to RETRO_DEVICE_JOYPAD). 1110 * It will return a bitmask of all the digital buttons. 1111 */ 1112 1113 #define RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION 52 1114 /* unsigned * -- 1115 * Unsigned value is the API version number of the core options 1116 * interface supported by the frontend. If callback return false, 1117 * API version is assumed to be 0. 1118 * 1119 * In legacy code, core options are set by passing an array of 1120 * retro_variable structs to RETRO_ENVIRONMENT_SET_VARIABLES. 1121 * This may be still be done regardless of the core options 1122 * interface version. 1123 * 1124 * If version is >= 1 however, core options may instead be set by 1125 * passing an array of retro_core_option_definition structs to 1126 * RETRO_ENVIRONMENT_SET_CORE_OPTIONS, or a 2D array of 1127 * retro_core_option_definition structs to RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL. 1128 * This allows the core to additionally set option sublabel information 1129 * and/or provide localisation support. 1130 */ 1131 1132 #define RETRO_ENVIRONMENT_SET_CORE_OPTIONS 53 1133 /* const struct retro_core_option_definition ** -- 1134 * Allows an implementation to signal the environment 1135 * which variables it might want to check for later using 1136 * GET_VARIABLE. 1137 * This allows the frontend to present these variables to 1138 * a user dynamically. 1139 * This should only be called if RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION 1140 * returns an API version of >= 1. 1141 * This should be called instead of RETRO_ENVIRONMENT_SET_VARIABLES. 1142 * This should be called the first time as early as 1143 * possible (ideally in retro_set_environment). 1144 * Afterwards it may be called again for the core to communicate 1145 * updated options to the frontend, but the number of core 1146 * options must not change from the number in the initial call. 1147 * 1148 * 'data' points to an array of retro_core_option_definition structs 1149 * terminated by a { NULL, NULL, NULL, {{0}}, NULL } element. 1150 * retro_core_option_definition::key should be namespaced to not collide 1151 * with other implementations' keys. e.g. A core called 1152 * 'foo' should use keys named as 'foo_option'. 1153 * retro_core_option_definition::desc should contain a human readable 1154 * description of the key. 1155 * retro_core_option_definition::info should contain any additional human 1156 * readable information text that a typical user may need to 1157 * understand the functionality of the option. 1158 * retro_core_option_definition::values is an array of retro_core_option_value 1159 * structs terminated by a { NULL, NULL } element. 1160 * > retro_core_option_definition::values[index].value is an expected option 1161 * value. 1162 * > retro_core_option_definition::values[index].label is a human readable 1163 * label used when displaying the value on screen. If NULL, 1164 * the value itself is used. 1165 * retro_core_option_definition::default_value is the default core option 1166 * setting. It must match one of the expected option values in the 1167 * retro_core_option_definition::values array. If it does not, or the 1168 * default value is NULL, the first entry in the 1169 * retro_core_option_definition::values array is treated as the default. 1170 * 1171 * The number of possible options should be very limited, 1172 * and must be less than RETRO_NUM_CORE_OPTION_VALUES_MAX. 1173 * i.e. it should be feasible to cycle through options 1174 * without a keyboard. 1175 * 1176 * Example entry: 1177 * { 1178 * "foo_option", 1179 * "Speed hack coprocessor X", 1180 * "Provides increased performance at the expense of reduced accuracy", 1181 * { 1182 * { "false", NULL }, 1183 * { "true", NULL }, 1184 * { "unstable", "Turbo (Unstable)" }, 1185 * { NULL, NULL }, 1186 * }, 1187 * "false" 1188 * } 1189 * 1190 * Only strings are operated on. The possible values will 1191 * generally be displayed and stored as-is by the frontend. 1192 */ 1193 1194 #define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL 54 1195 /* const struct retro_core_options_intl * -- 1196 * Allows an implementation to signal the environment 1197 * which variables it might want to check for later using 1198 * GET_VARIABLE. 1199 * This allows the frontend to present these variables to 1200 * a user dynamically. 1201 * This should only be called if RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION 1202 * returns an API version of >= 1. 1203 * This should be called instead of RETRO_ENVIRONMENT_SET_VARIABLES. 1204 * This should be called the first time as early as 1205 * possible (ideally in retro_set_environment). 1206 * Afterwards it may be called again for the core to communicate 1207 * updated options to the frontend, but the number of core 1208 * options must not change from the number in the initial call. 1209 * 1210 * This is fundamentally the same as RETRO_ENVIRONMENT_SET_CORE_OPTIONS, 1211 * with the addition of localisation support. The description of the 1212 * RETRO_ENVIRONMENT_SET_CORE_OPTIONS callback should be consulted 1213 * for further details. 1214 * 1215 * 'data' points to a retro_core_options_intl struct. 1216 * 1217 * retro_core_options_intl::us is a pointer to an array of 1218 * retro_core_option_definition structs defining the US English 1219 * core options implementation. It must point to a valid array. 1220 * 1221 * retro_core_options_intl::local is a pointer to an array of 1222 * retro_core_option_definition structs defining core options for 1223 * the current frontend language. It may be NULL (in which case 1224 * retro_core_options_intl::us is used by the frontend). Any items 1225 * missing from this array will be read from retro_core_options_intl::us 1226 * instead. 1227 * 1228 * NOTE: Default core option values are always taken from the 1229 * retro_core_options_intl::us array. Any default values in 1230 * retro_core_options_intl::local array will be ignored. 1231 */ 1232 1233 #define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY 55 1234 /* struct retro_core_option_display * -- 1235 * 1236 * Allows an implementation to signal the environment to show 1237 * or hide a variable when displaying core options. This is 1238 * considered a *suggestion*. The frontend is free to ignore 1239 * this callback, and its implementation not considered mandatory. 1240 * 1241 * 'data' points to a retro_core_option_display struct 1242 * 1243 * retro_core_option_display::key is a variable identifier 1244 * which has already been set by SET_VARIABLES/SET_CORE_OPTIONS. 1245 * 1246 * retro_core_option_display::visible is a boolean, specifying 1247 * whether variable should be displayed 1248 * 1249 * Note that all core option variables will be set visible by 1250 * default when calling SET_VARIABLES/SET_CORE_OPTIONS. 1251 */ 1252 1253 #define RETRO_ENVIRONMENT_GET_PREFERRED_HW_RENDER 56 1254 /* unsigned * -- 1255 * 1256 * Allows an implementation to ask frontend preferred hardware 1257 * context to use. Core should use this information to deal 1258 * with what specific context to request with SET_HW_RENDER. 1259 * 1260 * 'data' points to an unsigned variable 1261 */ 1262 1263 #define RETRO_ENVIRONMENT_GET_DISK_CONTROL_INTERFACE_VERSION 57 1264 /* unsigned * -- 1265 * Unsigned value is the API version number of the disk control 1266 * interface supported by the frontend. If callback return false, 1267 * API version is assumed to be 0. 1268 * 1269 * In legacy code, the disk control interface is defined by passing 1270 * a struct of type retro_disk_control_callback to 1271 * RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE. 1272 * This may be still be done regardless of the disk control 1273 * interface version. 1274 * 1275 * If version is >= 1 however, the disk control interface may 1276 * instead be defined by passing a struct of type 1277 * retro_disk_control_ext_callback to 1278 * RETRO_ENVIRONMENT_SET_DISK_CONTROL_EXT_INTERFACE. 1279 * This allows the core to provide additional information about 1280 * disk images to the frontend and/or enables extra 1281 * disk control functionality by the frontend. 1282 */ 1283 1284 #define RETRO_ENVIRONMENT_SET_DISK_CONTROL_EXT_INTERFACE 58 1285 /* const struct retro_disk_control_ext_callback * -- 1286 * Sets an interface which frontend can use to eject and insert 1287 * disk images, and also obtain information about individual 1288 * disk image files registered by the core. 1289 * This is used for games which consist of multiple images and 1290 * must be manually swapped out by the user (e.g. PSX, floppy disk 1291 * based systems). 1292 */ 1293 1294 #define RETRO_ENVIRONMENT_GET_MESSAGE_INTERFACE_VERSION 59 1295 /* unsigned * -- 1296 * Unsigned value is the API version number of the message 1297 * interface supported by the frontend. If callback returns 1298 * false, API version is assumed to be 0. 1299 * 1300 * In legacy code, messages may be displayed in an 1301 * implementation-specific manner by passing a struct 1302 * of type retro_message to RETRO_ENVIRONMENT_SET_MESSAGE. 1303 * This may be still be done regardless of the message 1304 * interface version. 1305 * 1306 * If version is >= 1 however, messages may instead be 1307 * displayed by passing a struct of type retro_message_ext 1308 * to RETRO_ENVIRONMENT_SET_MESSAGE_EXT. This allows the 1309 * core to specify message logging level, priority and 1310 * destination (OSD, logging interface or both). 1311 */ 1312 1313 #define RETRO_ENVIRONMENT_SET_MESSAGE_EXT 60 1314 /* const struct retro_message_ext * -- 1315 * Sets a message to be displayed in an implementation-specific 1316 * manner for a certain amount of 'frames'. Additionally allows 1317 * the core to specify message logging level, priority and 1318 * destination (OSD, logging interface or both). 1319 * Should not be used for trivial messages, which should simply be 1320 * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a 1321 * fallback, stderr). 1322 */ 1323 1324 #define RETRO_ENVIRONMENT_GET_INPUT_MAX_USERS 61 1325 /* unsigned * -- 1326 * Unsigned value is the number of active input devices 1327 * provided by the frontend. This may change between 1328 * frames, but will remain constant for the duration 1329 * of each frame. 1330 * If callback returns true, a core need not poll any 1331 * input device with an index greater than or equal to 1332 * the number of active devices. 1333 * If callback returns false, the number of active input 1334 * devices is unknown. In this case, all input devices 1335 * should be considered active. 1336 */ 1337 1338 #define RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK 62 1339 /* const struct retro_audio_buffer_status_callback * -- 1340 * Lets the core know the occupancy level of the frontend 1341 * audio buffer. Can be used by a core to attempt frame 1342 * skipping in order to avoid buffer under-runs. 1343 * A core may pass NULL to disable buffer status reporting 1344 * in the frontend. 1345 */ 1346 1347 #define RETRO_ENVIRONMENT_SET_MINIMUM_AUDIO_LATENCY 63 1348 /* const unsigned * -- 1349 * Sets minimum frontend audio latency in milliseconds. 1350 * Resultant audio latency may be larger than set value, 1351 * or smaller if a hardware limit is encountered. A frontend 1352 * is expected to honour requests up to 512 ms. 1353 * 1354 * - If value is less than current frontend 1355 * audio latency, callback has no effect 1356 * - If value is zero, default frontend audio 1357 * latency is set 1358 * 1359 * May be used by a core to increase audio latency and 1360 * therefore decrease the probability of buffer under-runs 1361 * (crackling) when performing 'intensive' operations. 1362 * A core utilising RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK 1363 * to implement audio-buffer-based frame skipping may achieve 1364 * optimal results by setting the audio latency to a 'high' 1365 * (typically 6x or 8x) integer multiple of the expected 1366 * frame time. 1367 * 1368 * WARNING: This can only be called from within retro_run(). 1369 * Calling this can require a full reinitialization of audio 1370 * drivers in the frontend, so it is important to call it very 1371 * sparingly, and usually only with the users explicit consent. 1372 * An eventual driver reinitialize will happen so that audio 1373 * callbacks happening after this call within the same retro_run() 1374 * call will target the newly initialized driver. 1375 */ 1376 1377 /* VFS functionality */ 1378 1379 /* File paths: 1380 * File paths passed as parameters when using this API shall be well formed UNIX-style, 1381 * using "/" (unquoted forward slash) as directory separator regardless of the platform's native separator. 1382 * Paths shall also include at least one forward slash ("game.bin" is an invalid path, use "./game.bin" instead). 1383 * Other than the directory separator, cores shall not make assumptions about path format: 1384 * "C:/path/game.bin", "http://example.com/game.bin", "#game/game.bin", "./game.bin" (without quotes) are all valid paths. 1385 * Cores may replace the basename or remove path components from the end, and/or add new components; 1386 * however, cores shall not append "./", "../" or multiple consecutive forward slashes ("//") to paths they request to front end. 1387 * The frontend is encouraged to make such paths work as well as it can, but is allowed to give up if the core alters paths too much. 1388 * Frontends are encouraged, but not required, to support native file system paths (modulo replacing the directory separator, if applicable). 1389 * Cores are allowed to try using them, but must remain functional if the front rejects such requests. 1390 * Cores are encouraged to use the libretro-common filestream functions for file I/O, 1391 * as they seamlessly integrate with VFS, deal with directory separator replacement as appropriate 1392 * and provide platform-specific fallbacks in cases where front ends do not support VFS. */ 1393 1394 /* Opaque file handle 1395 * Introduced in VFS API v1 */ 1396 struct retro_vfs_file_handle; 1397 1398 /* Opaque directory handle 1399 * Introduced in VFS API v3 */ 1400 struct retro_vfs_dir_handle; 1401 1402 /* File open flags 1403 * Introduced in VFS API v1 */ 1404 #define RETRO_VFS_FILE_ACCESS_READ (1 << 0) /* Read only mode */ 1405 #define RETRO_VFS_FILE_ACCESS_WRITE (1 << 1) /* Write only mode, discard contents and overwrites existing file unless RETRO_VFS_FILE_ACCESS_UPDATE is also specified */ 1406 #define RETRO_VFS_FILE_ACCESS_READ_WRITE (RETRO_VFS_FILE_ACCESS_READ | RETRO_VFS_FILE_ACCESS_WRITE) /* Read-write mode, discard contents and overwrites existing file unless RETRO_VFS_FILE_ACCESS_UPDATE is also specified*/ 1407 #define RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING (1 << 2) /* Prevents discarding content of existing files opened for writing */ 1408 1409 /* These are only hints. The frontend may choose to ignore them. Other than RAM/CPU/etc use, 1410 and how they react to unlikely external interference (for example someone else writing to that file, 1411 or the file's server going down), behavior will not change. */ 1412 #define RETRO_VFS_FILE_ACCESS_HINT_NONE (0) 1413 /* Indicate that the file will be accessed many times. The frontend should aggressively cache everything. */ 1414 #define RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS (1 << 0) 1415 1416 /* Seek positions */ 1417 #define RETRO_VFS_SEEK_POSITION_START 0 1418 #define RETRO_VFS_SEEK_POSITION_CURRENT 1 1419 #define RETRO_VFS_SEEK_POSITION_END 2 1420 1421 /* stat() result flags 1422 * Introduced in VFS API v3 */ 1423 #define RETRO_VFS_STAT_IS_VALID (1 << 0) 1424 #define RETRO_VFS_STAT_IS_DIRECTORY (1 << 1) 1425 #define RETRO_VFS_STAT_IS_CHARACTER_SPECIAL (1 << 2) 1426 1427 /* Get path from opaque handle. Returns the exact same path passed to file_open when getting the handle 1428 * Introduced in VFS API v1 */ 1429 typedef const char *(RETRO_CALLCONV *retro_vfs_get_path_t)(struct retro_vfs_file_handle *stream); 1430 1431 /* Open a file for reading or writing. If path points to a directory, this will 1432 * fail. Returns the opaque file handle, or NULL for error. 1433 * Introduced in VFS API v1 */ 1434 typedef struct retro_vfs_file_handle *(RETRO_CALLCONV *retro_vfs_open_t)(const char *path, unsigned mode, unsigned hints); 1435 1436 /* Close the file and release its resources. Must be called if open_file returns non-NULL. Returns 0 on success, -1 on failure. 1437 * Whether the call succeeds ot not, the handle passed as parameter becomes invalid and should no longer be used. 1438 * Introduced in VFS API v1 */ 1439 typedef int (RETRO_CALLCONV *retro_vfs_close_t)(struct retro_vfs_file_handle *stream); 1440 1441 /* Return the size of the file in bytes, or -1 for error. 1442 * Introduced in VFS API v1 */ 1443 typedef int64_t (RETRO_CALLCONV *retro_vfs_size_t)(struct retro_vfs_file_handle *stream); 1444 1445 /* Truncate file to specified size. Returns 0 on success or -1 on error 1446 * Introduced in VFS API v2 */ 1447 typedef int64_t (RETRO_CALLCONV *retro_vfs_truncate_t)(struct retro_vfs_file_handle *stream, int64_t length); 1448 1449 /* Get the current read / write position for the file. Returns -1 for error. 1450 * Introduced in VFS API v1 */ 1451 typedef int64_t (RETRO_CALLCONV *retro_vfs_tell_t)(struct retro_vfs_file_handle *stream); 1452 1453 /* Set the current read/write position for the file. Returns the new position, -1 for error. 1454 * Introduced in VFS API v1 */ 1455 typedef int64_t (RETRO_CALLCONV *retro_vfs_seek_t)(struct retro_vfs_file_handle *stream, int64_t offset, int seek_position); 1456 1457 /* Read data from a file. Returns the number of bytes read, or -1 for error. 1458 * Introduced in VFS API v1 */ 1459 typedef int64_t (RETRO_CALLCONV *retro_vfs_read_t)(struct retro_vfs_file_handle *stream, void *s, uint64_t len); 1460 1461 /* Write data to a file. Returns the number of bytes written, or -1 for error. 1462 * Introduced in VFS API v1 */ 1463 typedef int64_t (RETRO_CALLCONV *retro_vfs_write_t)(struct retro_vfs_file_handle *stream, const void *s, uint64_t len); 1464 1465 /* Flush pending writes to file, if using buffered IO. Returns 0 on sucess, or -1 on failure. 1466 * Introduced in VFS API v1 */ 1467 typedef int (RETRO_CALLCONV *retro_vfs_flush_t)(struct retro_vfs_file_handle *stream); 1468 1469 /* Delete the specified file. Returns 0 on success, -1 on failure 1470 * Introduced in VFS API v1 */ 1471 typedef int (RETRO_CALLCONV *retro_vfs_remove_t)(const char *path); 1472 1473 /* Rename the specified file. Returns 0 on success, -1 on failure 1474 * Introduced in VFS API v1 */ 1475 typedef int (RETRO_CALLCONV *retro_vfs_rename_t)(const char *old_path, const char *new_path); 1476 1477 /* Stat the specified file. Retruns a bitmask of RETRO_VFS_STAT_* flags, none are set if path was not valid. 1478 * Additionally stores file size in given variable, unless NULL is given. 1479 * Introduced in VFS API v3 */ 1480 typedef int (RETRO_CALLCONV *retro_vfs_stat_t)(const char *path, int32_t *size); 1481 1482 /* Create the specified directory. Returns 0 on success, -1 on unknown failure, -2 if already exists. 1483 * Introduced in VFS API v3 */ 1484 typedef int (RETRO_CALLCONV *retro_vfs_mkdir_t)(const char *dir); 1485 1486 /* Open the specified directory for listing. Returns the opaque dir handle, or NULL for error. 1487 * Support for the include_hidden argument may vary depending on the platform. 1488 * Introduced in VFS API v3 */ 1489 typedef struct retro_vfs_dir_handle *(RETRO_CALLCONV *retro_vfs_opendir_t)(const char *dir, bool include_hidden); 1490 1491 /* Read the directory entry at the current position, and move the read pointer to the next position. 1492 * Returns true on success, false if already on the last entry. 1493 * Introduced in VFS API v3 */ 1494 typedef bool (RETRO_CALLCONV *retro_vfs_readdir_t)(struct retro_vfs_dir_handle *dirstream); 1495 1496 /* Get the name of the last entry read. Returns a string on success, or NULL for error. 1497 * The returned string pointer is valid until the next call to readdir or closedir. 1498 * Introduced in VFS API v3 */ 1499 typedef const char *(RETRO_CALLCONV *retro_vfs_dirent_get_name_t)(struct retro_vfs_dir_handle *dirstream); 1500 1501 /* Check if the last entry read was a directory. Returns true if it was, false otherwise (or on error). 1502 * Introduced in VFS API v3 */ 1503 typedef bool (RETRO_CALLCONV *retro_vfs_dirent_is_dir_t)(struct retro_vfs_dir_handle *dirstream); 1504 1505 /* Close the directory and release its resources. Must be called if opendir returns non-NULL. Returns 0 on success, -1 on failure. 1506 * Whether the call succeeds ot not, the handle passed as parameter becomes invalid and should no longer be used. 1507 * Introduced in VFS API v3 */ 1508 typedef int (RETRO_CALLCONV *retro_vfs_closedir_t)(struct retro_vfs_dir_handle *dirstream); 1509 1510 struct retro_vfs_interface 1511 { 1512 /* VFS API v1 */ 1513 retro_vfs_get_path_t get_path; 1514 retro_vfs_open_t open; 1515 retro_vfs_close_t close; 1516 retro_vfs_size_t size; 1517 retro_vfs_tell_t tell; 1518 retro_vfs_seek_t seek; 1519 retro_vfs_read_t read; 1520 retro_vfs_write_t write; 1521 retro_vfs_flush_t flush; 1522 retro_vfs_remove_t remove; 1523 retro_vfs_rename_t rename; 1524 /* VFS API v2 */ 1525 retro_vfs_truncate_t truncate; 1526 /* VFS API v3 */ 1527 retro_vfs_stat_t stat; 1528 retro_vfs_mkdir_t mkdir; 1529 retro_vfs_opendir_t opendir; 1530 retro_vfs_readdir_t readdir; 1531 retro_vfs_dirent_get_name_t dirent_get_name; 1532 retro_vfs_dirent_is_dir_t dirent_is_dir; 1533 retro_vfs_closedir_t closedir; 1534 }; 1535 1536 struct retro_vfs_interface_info 1537 { 1538 /* Set by core: should this be higher than the version the front end supports, 1539 * front end will return false in the RETRO_ENVIRONMENT_GET_VFS_INTERFACE call 1540 * Introduced in VFS API v1 */ 1541 uint32_t required_interface_version; 1542 1543 /* Frontend writes interface pointer here. The frontend also sets the actual 1544 * version, must be at least required_interface_version. 1545 * Introduced in VFS API v1 */ 1546 struct retro_vfs_interface *iface; 1547 }; 1548 1549 enum retro_hw_render_interface_type 1550 { 1551 RETRO_HW_RENDER_INTERFACE_VULKAN = 0, 1552 RETRO_HW_RENDER_INTERFACE_D3D9 = 1, 1553 RETRO_HW_RENDER_INTERFACE_D3D10 = 2, 1554 RETRO_HW_RENDER_INTERFACE_D3D11 = 3, 1555 RETRO_HW_RENDER_INTERFACE_D3D12 = 4, 1556 RETRO_HW_RENDER_INTERFACE_GSKIT_PS2 = 5, 1557 RETRO_HW_RENDER_INTERFACE_DUMMY = INT_MAX 1558 }; 1559 1560 /* Base struct. All retro_hw_render_interface_* types 1561 * contain at least these fields. */ 1562 struct retro_hw_render_interface 1563 { 1564 enum retro_hw_render_interface_type interface_type; 1565 unsigned interface_version; 1566 }; 1567 1568 typedef void (RETRO_CALLCONV *retro_set_led_state_t)(int led, int state); 1569 struct retro_led_interface 1570 { 1571 retro_set_led_state_t set_led_state; 1572 }; 1573 1574 /* Retrieves the current state of the MIDI input. 1575 * Returns true if it's enabled, false otherwise. */ 1576 typedef bool (RETRO_CALLCONV *retro_midi_input_enabled_t)(void); 1577 1578 /* Retrieves the current state of the MIDI output. 1579 * Returns true if it's enabled, false otherwise */ 1580 typedef bool (RETRO_CALLCONV *retro_midi_output_enabled_t)(void); 1581 1582 /* Reads next byte from the input stream. 1583 * Returns true if byte is read, false otherwise. */ 1584 typedef bool (RETRO_CALLCONV *retro_midi_read_t)(uint8_t *byte); 1585 1586 /* Writes byte to the output stream. 1587 * 'delta_time' is in microseconds and represent time elapsed since previous write. 1588 * Returns true if byte is written, false otherwise. */ 1589 typedef bool (RETRO_CALLCONV *retro_midi_write_t)(uint8_t byte, uint32_t delta_time); 1590 1591 /* Flushes previously written data. 1592 * Returns true if successful, false otherwise. */ 1593 typedef bool (RETRO_CALLCONV *retro_midi_flush_t)(void); 1594 1595 struct retro_midi_interface 1596 { 1597 retro_midi_input_enabled_t input_enabled; 1598 retro_midi_output_enabled_t output_enabled; 1599 retro_midi_read_t read; 1600 retro_midi_write_t write; 1601 retro_midi_flush_t flush; 1602 }; 1603 1604 enum retro_hw_render_context_negotiation_interface_type 1605 { 1606 RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_VULKAN = 0, 1607 RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_DUMMY = INT_MAX 1608 }; 1609 1610 /* Base struct. All retro_hw_render_context_negotiation_interface_* types 1611 * contain at least these fields. */ 1612 struct retro_hw_render_context_negotiation_interface 1613 { 1614 enum retro_hw_render_context_negotiation_interface_type interface_type; 1615 unsigned interface_version; 1616 }; 1617 1618 /* Serialized state is incomplete in some way. Set if serialization is 1619 * usable in typical end-user cases but should not be relied upon to 1620 * implement frame-sensitive frontend features such as netplay or 1621 * rerecording. */ 1622 #define RETRO_SERIALIZATION_QUIRK_INCOMPLETE (1 << 0) 1623 /* The core must spend some time initializing before serialization is 1624 * supported. retro_serialize() will initially fail; retro_unserialize() 1625 * and retro_serialize_size() may or may not work correctly either. */ 1626 #define RETRO_SERIALIZATION_QUIRK_MUST_INITIALIZE (1 << 1) 1627 /* Serialization size may change within a session. */ 1628 #define RETRO_SERIALIZATION_QUIRK_CORE_VARIABLE_SIZE (1 << 2) 1629 /* Set by the frontend to acknowledge that it supports variable-sized 1630 * states. */ 1631 #define RETRO_SERIALIZATION_QUIRK_FRONT_VARIABLE_SIZE (1 << 3) 1632 /* Serialized state can only be loaded during the same session. */ 1633 #define RETRO_SERIALIZATION_QUIRK_SINGLE_SESSION (1 << 4) 1634 /* Serialized state cannot be loaded on an architecture with a different 1635 * endianness from the one it was saved on. */ 1636 #define RETRO_SERIALIZATION_QUIRK_ENDIAN_DEPENDENT (1 << 5) 1637 /* Serialized state cannot be loaded on a different platform from the one it 1638 * was saved on for reasons other than endianness, such as word size 1639 * dependence */ 1640 #define RETRO_SERIALIZATION_QUIRK_PLATFORM_DEPENDENT (1 << 6) 1641 1642 #define RETRO_MEMDESC_CONST (1 << 0) /* The frontend will never change this memory area once retro_load_game has returned. */ 1643 #define RETRO_MEMDESC_BIGENDIAN (1 << 1) /* The memory area contains big endian data. Default is little endian. */ 1644 #define RETRO_MEMDESC_SYSTEM_RAM (1 << 2) /* The memory area is system RAM. This is main RAM of the gaming system. */ 1645 #define RETRO_MEMDESC_SAVE_RAM (1 << 3) /* The memory area is save RAM. This RAM is usually found on a game cartridge, backed up by a battery. */ 1646 #define RETRO_MEMDESC_VIDEO_RAM (1 << 4) /* The memory area is video RAM (VRAM) */ 1647 #define RETRO_MEMDESC_ALIGN_2 (1 << 16) /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */ 1648 #define RETRO_MEMDESC_ALIGN_4 (2 << 16) 1649 #define RETRO_MEMDESC_ALIGN_8 (3 << 16) 1650 #define RETRO_MEMDESC_MINSIZE_2 (1 << 24) /* All memory in this region is accessed at least 2 bytes at the time. */ 1651 #define RETRO_MEMDESC_MINSIZE_4 (2 << 24) 1652 #define RETRO_MEMDESC_MINSIZE_8 (3 << 24) 1653 struct retro_memory_descriptor 1654 { 1655 uint64_t flags; 1656 1657 /* Pointer to the start of the relevant ROM or RAM chip. 1658 * It's strongly recommended to use 'offset' if possible, rather than 1659 * doing math on the pointer. 1660 * 1661 * If the same byte is mapped my multiple descriptors, their descriptors 1662 * must have the same pointer. 1663 * If 'start' does not point to the first byte in the pointer, put the 1664 * difference in 'offset' instead. 1665 * 1666 * May be NULL if there's nothing usable here (e.g. hardware registers and 1667 * open bus). No flags should be set if the pointer is NULL. 1668 * It's recommended to minimize the number of descriptors if possible, 1669 * but not mandatory. */ 1670 void *ptr; 1671 size_t offset; 1672 1673 /* This is the location in the emulated address space 1674 * where the mapping starts. */ 1675 size_t start; 1676 1677 /* Which bits must be same as in 'start' for this mapping to apply. 1678 * The first memory descriptor to claim a certain byte is the one 1679 * that applies. 1680 * A bit which is set in 'start' must also be set in this. 1681 * Can be zero, in which case each byte is assumed mapped exactly once. 1682 * In this case, 'len' must be a power of two. */ 1683 size_t select; 1684 1685 /* If this is nonzero, the set bits are assumed not connected to the 1686 * memory chip's address pins. */ 1687 size_t disconnect; 1688 1689 /* This one tells the size of the current memory area. 1690 * If, after start+disconnect are applied, the address is higher than 1691 * this, the highest bit of the address is cleared. 1692 * 1693 * If the address is still too high, the next highest bit is cleared. 1694 * Can be zero, in which case it's assumed to be infinite (as limited 1695 * by 'select' and 'disconnect'). */ 1696 size_t len; 1697 1698 /* To go from emulated address to physical address, the following 1699 * order applies: 1700 * Subtract 'start', pick off 'disconnect', apply 'len', add 'offset'. */ 1701 1702 /* The address space name must consist of only a-zA-Z0-9_-, 1703 * should be as short as feasible (maximum length is 8 plus the NUL), 1704 * and may not be any other address space plus one or more 0-9A-F 1705 * at the end. 1706 * However, multiple memory descriptors for the same address space is 1707 * allowed, and the address space name can be empty. NULL is treated 1708 * as empty. 1709 * 1710 * Address space names are case sensitive, but avoid lowercase if possible. 1711 * The same pointer may exist in multiple address spaces. 1712 * 1713 * Examples: 1714 * blank+blank - valid (multiple things may be mapped in the same namespace) 1715 * 'Sp'+'Sp' - valid (multiple things may be mapped in the same namespace) 1716 * 'A'+'B' - valid (neither is a prefix of each other) 1717 * 'S'+blank - valid ('S' is not in 0-9A-F) 1718 * 'a'+blank - valid ('a' is not in 0-9A-F) 1719 * 'a'+'A' - valid (neither is a prefix of each other) 1720 * 'AR'+blank - valid ('R' is not in 0-9A-F) 1721 * 'ARB'+blank - valid (the B can't be part of the address either, because 1722 * there is no namespace 'AR') 1723 * blank+'B' - not valid, because it's ambigous which address space B1234 1724 * would refer to. 1725 * The length can't be used for that purpose; the frontend may want 1726 * to append arbitrary data to an address, without a separator. */ 1727 const char *addrspace; 1728 1729 /* TODO: When finalizing this one, add a description field, which should be 1730 * "WRAM" or something roughly equally long. */ 1731 1732 /* TODO: When finalizing this one, replace 'select' with 'limit', which tells 1733 * which bits can vary and still refer to the same address (limit = ~select). 1734 * TODO: limit? range? vary? something else? */ 1735 1736 /* TODO: When finalizing this one, if 'len' is above what 'select' (or 1737 * 'limit') allows, it's bankswitched. Bankswitched data must have both 'len' 1738 * and 'select' != 0, and the mappings don't tell how the system switches the 1739 * banks. */ 1740 1741 /* TODO: When finalizing this one, fix the 'len' bit removal order. 1742 * For len=0x1800, pointer 0x1C00 should go to 0x1400, not 0x0C00. 1743 * Algorithm: Take bits highest to lowest, but if it goes above len, clear 1744 * the most recent addition and continue on the next bit. 1745 * TODO: Can the above be optimized? Is "remove the lowest bit set in both 1746 * pointer and 'len'" equivalent? */ 1747 1748 /* TODO: Some emulators (MAME?) emulate big endian systems by only accessing 1749 * the emulated memory in 32-bit chunks, native endian. But that's nothing 1750 * compared to Darek Mihocka <http://www.emulators.com/docs/nx07_vm101.htm> 1751 * (section Emulation 103 - Nearly Free Byte Reversal) - he flips the ENTIRE 1752 * RAM backwards! I'll want to represent both of those, via some flags. 1753 * 1754 * I suspect MAME either didn't think of that idea, or don't want the #ifdef. 1755 * Not sure which, nor do I really care. */ 1756 1757 /* TODO: Some of those flags are unused and/or don't really make sense. Clean 1758 * them up. */ 1759 }; 1760 1761 /* The frontend may use the largest value of 'start'+'select' in a 1762 * certain namespace to infer the size of the address space. 1763 * 1764 * If the address space is larger than that, a mapping with .ptr=NULL 1765 * should be at the end of the array, with .select set to all ones for 1766 * as long as the address space is big. 1767 * 1768 * Sample descriptors (minus .ptr, and RETRO_MEMFLAG_ on the flags): 1769 * SNES WRAM: 1770 * .start=0x7E0000, .len=0x20000 1771 * (Note that this must be mapped before the ROM in most cases; some of the 1772 * ROM mappers 1773 * try to claim $7E0000, or at least $7E8000.) 1774 * SNES SPC700 RAM: 1775 * .addrspace="S", .len=0x10000 1776 * SNES WRAM mirrors: 1777 * .flags=MIRROR, .start=0x000000, .select=0xC0E000, .len=0x2000 1778 * .flags=MIRROR, .start=0x800000, .select=0xC0E000, .len=0x2000 1779 * SNES WRAM mirrors, alternate equivalent descriptor: 1780 * .flags=MIRROR, .select=0x40E000, .disconnect=~0x1FFF 1781 * (Various similar constructions can be created by combining parts of 1782 * the above two.) 1783 * SNES LoROM (512KB, mirrored a couple of times): 1784 * .flags=CONST, .start=0x008000, .select=0x408000, .disconnect=0x8000, .len=512*1024 1785 * .flags=CONST, .start=0x400000, .select=0x400000, .disconnect=0x8000, .len=512*1024 1786 * SNES HiROM (4MB): 1787 * .flags=CONST, .start=0x400000, .select=0x400000, .len=4*1024*1024 1788 * .flags=CONST, .offset=0x8000, .start=0x008000, .select=0x408000, .len=4*1024*1024 1789 * SNES ExHiROM (8MB): 1790 * .flags=CONST, .offset=0, .start=0xC00000, .select=0xC00000, .len=4*1024*1024 1791 * .flags=CONST, .offset=4*1024*1024, .start=0x400000, .select=0xC00000, .len=4*1024*1024 1792 * .flags=CONST, .offset=0x8000, .start=0x808000, .select=0xC08000, .len=4*1024*1024 1793 * .flags=CONST, .offset=4*1024*1024+0x8000, .start=0x008000, .select=0xC08000, .len=4*1024*1024 1794 * Clarify the size of the address space: 1795 * .ptr=NULL, .select=0xFFFFFF 1796 * .len can be implied by .select in many of them, but was included for clarity. 1797 */ 1798 1799 struct retro_memory_map 1800 { 1801 const struct retro_memory_descriptor *descriptors; 1802 unsigned num_descriptors; 1803 }; 1804 1805 struct retro_controller_description 1806 { 1807 /* Human-readable description of the controller. Even if using a generic 1808 * input device type, this can be set to the particular device type the 1809 * core uses. */ 1810 const char *desc; 1811 1812 /* Device type passed to retro_set_controller_port_device(). If the device 1813 * type is a sub-class of a generic input device type, use the 1814 * RETRO_DEVICE_SUBCLASS macro to create an ID. 1815 * 1816 * E.g. RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1). */ 1817 unsigned id; 1818 }; 1819 1820 struct retro_controller_info 1821 { 1822 const struct retro_controller_description *types; 1823 unsigned num_types; 1824 }; 1825 1826 struct retro_subsystem_memory_info 1827 { 1828 /* The extension associated with a memory type, e.g. "psram". */ 1829 const char *extension; 1830 1831 /* The memory type for retro_get_memory(). This should be at 1832 * least 0x100 to avoid conflict with standardized 1833 * libretro memory types. */ 1834 unsigned type; 1835 }; 1836 1837 struct retro_subsystem_rom_info 1838 { 1839 /* Describes what the content is (SGB BIOS, GB ROM, etc). */ 1840 const char *desc; 1841 1842 /* Same definition as retro_get_system_info(). */ 1843 const char *valid_extensions; 1844 1845 /* Same definition as retro_get_system_info(). */ 1846 bool need_fullpath; 1847 1848 /* Same definition as retro_get_system_info(). */ 1849 bool block_extract; 1850 1851 /* This is set if the content is required to load a game. 1852 * If this is set to false, a zeroed-out retro_game_info can be passed. */ 1853 bool required; 1854 1855 /* Content can have multiple associated persistent 1856 * memory types (retro_get_memory()). */ 1857 const struct retro_subsystem_memory_info *memory; 1858 unsigned num_memory; 1859 }; 1860 1861 struct retro_subsystem_info 1862 { 1863 /* Human-readable string of the subsystem type, e.g. "Super GameBoy" */ 1864 const char *desc; 1865 1866 /* A computer friendly short string identifier for the subsystem type. 1867 * This name must be [a-z]. 1868 * E.g. if desc is "Super GameBoy", this can be "sgb". 1869 * This identifier can be used for command-line interfaces, etc. 1870 */ 1871 const char *ident; 1872 1873 /* Infos for each content file. The first entry is assumed to be the 1874 * "most significant" content for frontend purposes. 1875 * E.g. with Super GameBoy, the first content should be the GameBoy ROM, 1876 * as it is the most "significant" content to a user. 1877 * If a frontend creates new file paths based on the content used 1878 * (e.g. savestates), it should use the path for the first ROM to do so. */ 1879 const struct retro_subsystem_rom_info *roms; 1880 1881 /* Number of content files associated with a subsystem. */ 1882 unsigned num_roms; 1883 1884 /* The type passed to retro_load_game_special(). */ 1885 unsigned id; 1886 }; 1887 1888 typedef void (RETRO_CALLCONV *retro_proc_address_t)(void); 1889 1890 /* libretro API extension functions: 1891 * (None here so far). 1892 * 1893 * Get a symbol from a libretro core. 1894 * Cores should only return symbols which are actual 1895 * extensions to the libretro API. 1896 * 1897 * Frontends should not use this to obtain symbols to standard 1898 * libretro entry points (static linking or dlsym). 1899 * 1900 * The symbol name must be equal to the function name, 1901 * e.g. if void retro_foo(void); exists, the symbol must be called "retro_foo". 1902 * The returned function pointer must be cast to the corresponding type. 1903 */ 1904 typedef retro_proc_address_t (RETRO_CALLCONV *retro_get_proc_address_t)(const char *sym); 1905 1906 struct retro_get_proc_address_interface 1907 { 1908 retro_get_proc_address_t get_proc_address; 1909 }; 1910 1911 enum retro_log_level 1912 { 1913 RETRO_LOG_DEBUG = 0, 1914 RETRO_LOG_INFO, 1915 RETRO_LOG_WARN, 1916 RETRO_LOG_ERROR, 1917 1918 RETRO_LOG_DUMMY = INT_MAX 1919 }; 1920 1921 /* Logging function. Takes log level argument as well. */ 1922 typedef void (RETRO_CALLCONV *retro_log_printf_t)(enum retro_log_level level, 1923 const char *fmt, ...); 1924 1925 struct retro_log_callback 1926 { 1927 retro_log_printf_t log; 1928 }; 1929 1930 /* Performance related functions */ 1931 1932 /* ID values for SIMD CPU features */ 1933 #define RETRO_SIMD_SSE (1 << 0) 1934 #define RETRO_SIMD_SSE2 (1 << 1) 1935 #define RETRO_SIMD_VMX (1 << 2) 1936 #define RETRO_SIMD_VMX128 (1 << 3) 1937 #define RETRO_SIMD_AVX (1 << 4) 1938 #define RETRO_SIMD_NEON (1 << 5) 1939 #define RETRO_SIMD_SSE3 (1 << 6) 1940 #define RETRO_SIMD_SSSE3 (1 << 7) 1941 #define RETRO_SIMD_MMX (1 << 8) 1942 #define RETRO_SIMD_MMXEXT (1 << 9) 1943 #define RETRO_SIMD_SSE4 (1 << 10) 1944 #define RETRO_SIMD_SSE42 (1 << 11) 1945 #define RETRO_SIMD_AVX2 (1 << 12) 1946 #define RETRO_SIMD_VFPU (1 << 13) 1947 #define RETRO_SIMD_PS (1 << 14) 1948 #define RETRO_SIMD_AES (1 << 15) 1949 #define RETRO_SIMD_VFPV3 (1 << 16) 1950 #define RETRO_SIMD_VFPV4 (1 << 17) 1951 #define RETRO_SIMD_POPCNT (1 << 18) 1952 #define RETRO_SIMD_MOVBE (1 << 19) 1953 #define RETRO_SIMD_CMOV (1 << 20) 1954 #define RETRO_SIMD_ASIMD (1 << 21) 1955 1956 typedef uint64_t retro_perf_tick_t; 1957 typedef int64_t retro_time_t; 1958 1959 struct retro_perf_counter 1960 { 1961 const char *ident; 1962 retro_perf_tick_t start; 1963 retro_perf_tick_t total; 1964 retro_perf_tick_t call_cnt; 1965 1966 bool registered; 1967 }; 1968 1969 /* Returns current time in microseconds. 1970 * Tries to use the most accurate timer available. 1971 */ 1972 typedef retro_time_t (RETRO_CALLCONV *retro_perf_get_time_usec_t)(void); 1973 1974 /* A simple counter. Usually nanoseconds, but can also be CPU cycles. 1975 * Can be used directly if desired (when creating a more sophisticated 1976 * performance counter system). 1977 * */ 1978 typedef retro_perf_tick_t (RETRO_CALLCONV *retro_perf_get_counter_t)(void); 1979 1980 /* Returns a bit-mask of detected CPU features (RETRO_SIMD_*). */ 1981 typedef uint64_t (RETRO_CALLCONV *retro_get_cpu_features_t)(void); 1982 1983 /* Asks frontend to log and/or display the state of performance counters. 1984 * Performance counters can always be poked into manually as well. 1985 */ 1986 typedef void (RETRO_CALLCONV *retro_perf_log_t)(void); 1987 1988 /* Register a performance counter. 1989 * ident field must be set with a discrete value and other values in 1990 * retro_perf_counter must be 0. 1991 * Registering can be called multiple times. To avoid calling to 1992 * frontend redundantly, you can check registered field first. */ 1993 typedef void (RETRO_CALLCONV *retro_perf_register_t)(struct retro_perf_counter *counter); 1994 1995 /* Starts a registered counter. */ 1996 typedef void (RETRO_CALLCONV *retro_perf_start_t)(struct retro_perf_counter *counter); 1997 1998 /* Stops a registered counter. */ 1999 typedef void (RETRO_CALLCONV *retro_perf_stop_t)(struct retro_perf_counter *counter); 2000 2001 /* For convenience it can be useful to wrap register, start and stop in macros. 2002 * E.g.: 2003 * #ifdef LOG_PERFORMANCE 2004 * #define RETRO_PERFORMANCE_INIT(perf_cb, name) static struct retro_perf_counter name = {#name}; if (!name.registered) perf_cb.perf_register(&(name)) 2005 * #define RETRO_PERFORMANCE_START(perf_cb, name) perf_cb.perf_start(&(name)) 2006 * #define RETRO_PERFORMANCE_STOP(perf_cb, name) perf_cb.perf_stop(&(name)) 2007 * #else 2008 * ... Blank macros ... 2009 * #endif 2010 * 2011 * These can then be used mid-functions around code snippets. 2012 * 2013 * extern struct retro_perf_callback perf_cb; * Somewhere in the core. 2014 * 2015 * void do_some_heavy_work(void) 2016 * { 2017 * RETRO_PERFORMANCE_INIT(cb, work_1; 2018 * RETRO_PERFORMANCE_START(cb, work_1); 2019 * heavy_work_1(); 2020 * RETRO_PERFORMANCE_STOP(cb, work_1); 2021 * 2022 * RETRO_PERFORMANCE_INIT(cb, work_2); 2023 * RETRO_PERFORMANCE_START(cb, work_2); 2024 * heavy_work_2(); 2025 * RETRO_PERFORMANCE_STOP(cb, work_2); 2026 * } 2027 * 2028 * void retro_deinit(void) 2029 * { 2030 * perf_cb.perf_log(); * Log all perf counters here for example. 2031 * } 2032 */ 2033 2034 struct retro_perf_callback 2035 { 2036 retro_perf_get_time_usec_t get_time_usec; 2037 retro_get_cpu_features_t get_cpu_features; 2038 2039 retro_perf_get_counter_t get_perf_counter; 2040 retro_perf_register_t perf_register; 2041 retro_perf_start_t perf_start; 2042 retro_perf_stop_t perf_stop; 2043 retro_perf_log_t perf_log; 2044 }; 2045 2046 /* FIXME: Document the sensor API and work out behavior. 2047 * It will be marked as experimental until then. 2048 */ 2049 enum retro_sensor_action 2050 { 2051 RETRO_SENSOR_ACCELEROMETER_ENABLE = 0, 2052 RETRO_SENSOR_ACCELEROMETER_DISABLE, 2053 RETRO_SENSOR_GYROSCOPE_ENABLE, 2054 RETRO_SENSOR_GYROSCOPE_DISABLE, 2055 RETRO_SENSOR_ILLUMINANCE_ENABLE, 2056 RETRO_SENSOR_ILLUMINANCE_DISABLE, 2057 2058 RETRO_SENSOR_DUMMY = INT_MAX 2059 }; 2060 2061 /* Id values for SENSOR types. */ 2062 #define RETRO_SENSOR_ACCELEROMETER_X 0 2063 #define RETRO_SENSOR_ACCELEROMETER_Y 1 2064 #define RETRO_SENSOR_ACCELEROMETER_Z 2 2065 #define RETRO_SENSOR_GYROSCOPE_X 3 2066 #define RETRO_SENSOR_GYROSCOPE_Y 4 2067 #define RETRO_SENSOR_GYROSCOPE_Z 5 2068 #define RETRO_SENSOR_ILLUMINANCE 6 2069 2070 typedef bool (RETRO_CALLCONV *retro_set_sensor_state_t)(unsigned port, 2071 enum retro_sensor_action action, unsigned rate); 2072 2073 typedef float (RETRO_CALLCONV *retro_sensor_get_input_t)(unsigned port, unsigned id); 2074 2075 struct retro_sensor_interface 2076 { 2077 retro_set_sensor_state_t set_sensor_state; 2078 retro_sensor_get_input_t get_sensor_input; 2079 }; 2080 2081 enum retro_camera_buffer 2082 { 2083 RETRO_CAMERA_BUFFER_OPENGL_TEXTURE = 0, 2084 RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER, 2085 2086 RETRO_CAMERA_BUFFER_DUMMY = INT_MAX 2087 }; 2088 2089 /* Starts the camera driver. Can only be called in retro_run(). */ 2090 typedef bool (RETRO_CALLCONV *retro_camera_start_t)(void); 2091 2092 /* Stops the camera driver. Can only be called in retro_run(). */ 2093 typedef void (RETRO_CALLCONV *retro_camera_stop_t)(void); 2094 2095 /* Callback which signals when the camera driver is initialized 2096 * and/or deinitialized. 2097 * retro_camera_start_t can be called in initialized callback. 2098 */ 2099 typedef void (RETRO_CALLCONV *retro_camera_lifetime_status_t)(void); 2100 2101 /* A callback for raw framebuffer data. buffer points to an XRGB8888 buffer. 2102 * Width, height and pitch are similar to retro_video_refresh_t. 2103 * First pixel is top-left origin. 2104 */ 2105 typedef void (RETRO_CALLCONV *retro_camera_frame_raw_framebuffer_t)(const uint32_t *buffer, 2106 unsigned width, unsigned height, size_t pitch); 2107 2108 /* A callback for when OpenGL textures are used. 2109 * 2110 * texture_id is a texture owned by camera driver. 2111 * Its state or content should be considered immutable, except for things like 2112 * texture filtering and clamping. 2113 * 2114 * texture_target is the texture target for the GL texture. 2115 * These can include e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE, and possibly 2116 * more depending on extensions. 2117 * 2118 * affine points to a packed 3x3 column-major matrix used to apply an affine 2119 * transform to texture coordinates. (affine_matrix * vec3(coord_x, coord_y, 1.0)) 2120 * After transform, normalized texture coord (0, 0) should be bottom-left 2121 * and (1, 1) should be top-right (or (width, height) for RECTANGLE). 2122 * 2123 * GL-specific typedefs are avoided here to avoid relying on gl.h in 2124 * the API definition. 2125 */ 2126 typedef void (RETRO_CALLCONV *retro_camera_frame_opengl_texture_t)(unsigned texture_id, 2127 unsigned texture_target, const float *affine); 2128 2129 struct retro_camera_callback 2130 { 2131 /* Set by libretro core. 2132 * Example bitmask: caps = (1 << RETRO_CAMERA_BUFFER_OPENGL_TEXTURE) | (1 << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER). 2133 */ 2134 uint64_t caps; 2135 2136 /* Desired resolution for camera. Is only used as a hint. */ 2137 unsigned width; 2138 unsigned height; 2139 2140 /* Set by frontend. */ 2141 retro_camera_start_t start; 2142 retro_camera_stop_t stop; 2143 2144 /* Set by libretro core if raw framebuffer callbacks will be used. */ 2145 retro_camera_frame_raw_framebuffer_t frame_raw_framebuffer; 2146 2147 /* Set by libretro core if OpenGL texture callbacks will be used. */ 2148 retro_camera_frame_opengl_texture_t frame_opengl_texture; 2149 2150 /* Set by libretro core. Called after camera driver is initialized and 2151 * ready to be started. 2152 * Can be NULL, in which this callback is not called. 2153 */ 2154 retro_camera_lifetime_status_t initialized; 2155 2156 /* Set by libretro core. Called right before camera driver is 2157 * deinitialized. 2158 * Can be NULL, in which this callback is not called. 2159 */ 2160 retro_camera_lifetime_status_t deinitialized; 2161 }; 2162 2163 /* Sets the interval of time and/or distance at which to update/poll 2164 * location-based data. 2165 * 2166 * To ensure compatibility with all location-based implementations, 2167 * values for both interval_ms and interval_distance should be provided. 2168 * 2169 * interval_ms is the interval expressed in milliseconds. 2170 * interval_distance is the distance interval expressed in meters. 2171 */ 2172 typedef void (RETRO_CALLCONV *retro_location_set_interval_t)(unsigned interval_ms, 2173 unsigned interval_distance); 2174 2175 /* Start location services. The device will start listening for changes to the 2176 * current location at regular intervals (which are defined with 2177 * retro_location_set_interval_t). */ 2178 typedef bool (RETRO_CALLCONV *retro_location_start_t)(void); 2179 2180 /* Stop location services. The device will stop listening for changes 2181 * to the current location. */ 2182 typedef void (RETRO_CALLCONV *retro_location_stop_t)(void); 2183 2184 /* Get the position of the current location. Will set parameters to 2185 * 0 if no new location update has happened since the last time. */ 2186 typedef bool (RETRO_CALLCONV *retro_location_get_position_t)(double *lat, double *lon, 2187 double *horiz_accuracy, double *vert_accuracy); 2188 2189 /* Callback which signals when the location driver is initialized 2190 * and/or deinitialized. 2191 * retro_location_start_t can be called in initialized callback. 2192 */ 2193 typedef void (RETRO_CALLCONV *retro_location_lifetime_status_t)(void); 2194 2195 struct retro_location_callback 2196 { 2197 retro_location_start_t start; 2198 retro_location_stop_t stop; 2199 retro_location_get_position_t get_position; 2200 retro_location_set_interval_t set_interval; 2201 2202 retro_location_lifetime_status_t initialized; 2203 retro_location_lifetime_status_t deinitialized; 2204 }; 2205 2206 enum retro_rumble_effect 2207 { 2208 RETRO_RUMBLE_STRONG = 0, 2209 RETRO_RUMBLE_WEAK = 1, 2210 2211 RETRO_RUMBLE_DUMMY = INT_MAX 2212 }; 2213 2214 /* Sets rumble state for joypad plugged in port 'port'. 2215 * Rumble effects are controlled independently, 2216 * and setting e.g. strong rumble does not override weak rumble. 2217 * Strength has a range of [0, 0xffff]. 2218 * 2219 * Returns true if rumble state request was honored. 2220 * Calling this before first retro_run() is likely to return false. */ 2221 typedef bool (RETRO_CALLCONV *retro_set_rumble_state_t)(unsigned port, 2222 enum retro_rumble_effect effect, uint16_t strength); 2223 2224 struct retro_rumble_interface 2225 { 2226 retro_set_rumble_state_t set_rumble_state; 2227 }; 2228 2229 /* Notifies libretro that audio data should be written. */ 2230 typedef void (RETRO_CALLCONV *retro_audio_callback_t)(void); 2231 2232 /* True: Audio driver in frontend is active, and callback is 2233 * expected to be called regularily. 2234 * False: Audio driver in frontend is paused or inactive. 2235 * Audio callback will not be called until set_state has been 2236 * called with true. 2237 * Initial state is false (inactive). 2238 */ 2239 typedef void (RETRO_CALLCONV *retro_audio_set_state_callback_t)(bool enabled); 2240 2241 struct retro_audio_callback 2242 { 2243 retro_audio_callback_t callback; 2244 retro_audio_set_state_callback_t set_state; 2245 }; 2246 2247 /* Notifies a libretro core of time spent since last invocation 2248 * of retro_run() in microseconds. 2249 * 2250 * It will be called right before retro_run() every frame. 2251 * The frontend can tamper with timing to support cases like 2252 * fast-forward, slow-motion and framestepping. 2253 * 2254 * In those scenarios the reference frame time value will be used. */ 2255 typedef int64_t retro_usec_t; 2256 typedef void (RETRO_CALLCONV *retro_frame_time_callback_t)(retro_usec_t usec); 2257 struct retro_frame_time_callback 2258 { 2259 retro_frame_time_callback_t callback; 2260 /* Represents the time of one frame. It is computed as 2261 * 1000000 / fps, but the implementation will resolve the 2262 * rounding to ensure that framestepping, etc is exact. */ 2263 retro_usec_t reference; 2264 }; 2265 2266 /* Notifies a libretro core of the current occupancy 2267 * level of the frontend audio buffer. 2268 * 2269 * - active: 'true' if audio buffer is currently 2270 * in use. Will be 'false' if audio is 2271 * disabled in the frontend 2272 * 2273 * - occupancy: Given as a value in the range [0,100], 2274 * corresponding to the occupancy percentage 2275 * of the audio buffer 2276 * 2277 * - underrun_likely: 'true' if the frontend expects an 2278 * audio buffer underrun during the 2279 * next frame (indicates that a core 2280 * should attempt frame skipping) 2281 * 2282 * It will be called right before retro_run() every frame. */ 2283 typedef void (RETRO_CALLCONV *retro_audio_buffer_status_callback_t)( 2284 bool active, unsigned occupancy, bool underrun_likely); 2285 struct retro_audio_buffer_status_callback 2286 { 2287 retro_audio_buffer_status_callback_t callback; 2288 }; 2289 2290 /* Pass this to retro_video_refresh_t if rendering to hardware. 2291 * Passing NULL to retro_video_refresh_t is still a frame dupe as normal. 2292 * */ 2293 #define RETRO_HW_FRAME_BUFFER_VALID ((void*)-1) 2294 2295 /* Invalidates the current HW context. 2296 * Any GL state is lost, and must not be deinitialized explicitly. 2297 * If explicit deinitialization is desired by the libretro core, 2298 * it should implement context_destroy callback. 2299 * If called, all GPU resources must be reinitialized. 2300 * Usually called when frontend reinits video driver. 2301 * Also called first time video driver is initialized, 2302 * allowing libretro core to initialize resources. 2303 */ 2304 typedef void (RETRO_CALLCONV *retro_hw_context_reset_t)(void); 2305 2306 /* Gets current framebuffer which is to be rendered to. 2307 * Could change every frame potentially. 2308 */ 2309 typedef uintptr_t (RETRO_CALLCONV *retro_hw_get_current_framebuffer_t)(void); 2310 2311 /* Get a symbol from HW context. */ 2312 typedef retro_proc_address_t (RETRO_CALLCONV *retro_hw_get_proc_address_t)(const char *sym); 2313 2314 enum retro_hw_context_type 2315 { 2316 RETRO_HW_CONTEXT_NONE = 0, 2317 /* OpenGL 2.x. Driver can choose to use latest compatibility context. */ 2318 RETRO_HW_CONTEXT_OPENGL = 1, 2319 /* OpenGL ES 2.0. */ 2320 RETRO_HW_CONTEXT_OPENGLES2 = 2, 2321 /* Modern desktop core GL context. Use version_major/ 2322 * version_minor fields to set GL version. */ 2323 RETRO_HW_CONTEXT_OPENGL_CORE = 3, 2324 /* OpenGL ES 3.0 */ 2325 RETRO_HW_CONTEXT_OPENGLES3 = 4, 2326 /* OpenGL ES 3.1+. Set version_major/version_minor. For GLES2 and GLES3, 2327 * use the corresponding enums directly. */ 2328 RETRO_HW_CONTEXT_OPENGLES_VERSION = 5, 2329 2330 /* Vulkan, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE. */ 2331 RETRO_HW_CONTEXT_VULKAN = 6, 2332 2333 /* Direct3D, set version_major to select the type of interface 2334 * returned by RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE */ 2335 RETRO_HW_CONTEXT_DIRECT3D = 7, 2336 2337 RETRO_HW_CONTEXT_DUMMY = INT_MAX 2338 }; 2339 2340 struct retro_hw_render_callback 2341 { 2342 /* Which API to use. Set by libretro core. */ 2343 enum retro_hw_context_type context_type; 2344 2345 /* Called when a context has been created or when it has been reset. 2346 * An OpenGL context is only valid after context_reset() has been called. 2347 * 2348 * When context_reset is called, OpenGL resources in the libretro 2349 * implementation are guaranteed to be invalid. 2350 * 2351 * It is possible that context_reset is called multiple times during an 2352 * application lifecycle. 2353 * If context_reset is called without any notification (context_destroy), 2354 * the OpenGL context was lost and resources should just be recreated 2355 * without any attempt to "free" old resources. 2356 */ 2357 retro_hw_context_reset_t context_reset; 2358 2359 /* Set by frontend. 2360 * TODO: This is rather obsolete. The frontend should not 2361 * be providing preallocated framebuffers. */ 2362 retro_hw_get_current_framebuffer_t get_current_framebuffer; 2363 2364 /* Set by frontend. 2365 * Can return all relevant functions, including glClear on Windows. */ 2366 retro_hw_get_proc_address_t get_proc_address; 2367 2368 /* Set if render buffers should have depth component attached. 2369 * TODO: Obsolete. */ 2370 bool depth; 2371 2372 /* Set if stencil buffers should be attached. 2373 * TODO: Obsolete. */ 2374 bool stencil; 2375 2376 /* If depth and stencil are true, a packed 24/8 buffer will be added. 2377 * Only attaching stencil is invalid and will be ignored. */ 2378 2379 /* Use conventional bottom-left origin convention. If false, 2380 * standard libretro top-left origin semantics are used. 2381 * TODO: Move to GL specific interface. */ 2382 bool bottom_left_origin; 2383 2384 /* Major version number for core GL context or GLES 3.1+. */ 2385 unsigned version_major; 2386 2387 /* Minor version number for core GL context or GLES 3.1+. */ 2388 unsigned version_minor; 2389 2390 /* If this is true, the frontend will go very far to avoid 2391 * resetting context in scenarios like toggling fullscreen, etc. 2392 * TODO: Obsolete? Maybe frontend should just always assume this ... 2393 */ 2394 bool cache_context; 2395 2396 /* The reset callback might still be called in extreme situations 2397 * such as if the context is lost beyond recovery. 2398 * 2399 * For optimal stability, set this to false, and allow context to be 2400 * reset at any time. 2401 */ 2402 2403 /* A callback to be called before the context is destroyed in a 2404 * controlled way by the frontend. */ 2405 retro_hw_context_reset_t context_destroy; 2406 2407 /* OpenGL resources can be deinitialized cleanly at this step. 2408 * context_destroy can be set to NULL, in which resources will 2409 * just be destroyed without any notification. 2410 * 2411 * Even when context_destroy is non-NULL, it is possible that 2412 * context_reset is called without any destroy notification. 2413 * This happens if context is lost by external factors (such as 2414 * notified by GL_ARB_robustness). 2415 * 2416 * In this case, the context is assumed to be already dead, 2417 * and the libretro implementation must not try to free any OpenGL 2418 * resources in the subsequent context_reset. 2419 */ 2420 2421 /* Creates a debug context. */ 2422 bool debug_context; 2423 }; 2424 2425 /* Callback type passed in RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK. 2426 * Called by the frontend in response to keyboard events. 2427 * down is set if the key is being pressed, or false if it is being released. 2428 * keycode is the RETROK value of the char. 2429 * character is the text character of the pressed key. (UTF-32). 2430 * key_modifiers is a set of RETROKMOD values or'ed together. 2431 * 2432 * The pressed/keycode state can be indepedent of the character. 2433 * It is also possible that multiple characters are generated from a 2434 * single keypress. 2435 * Keycode events should be treated separately from character events. 2436 * However, when possible, the frontend should try to synchronize these. 2437 * If only a character is posted, keycode should be RETROK_UNKNOWN. 2438 * 2439 * Similarily if only a keycode event is generated with no corresponding 2440 * character, character should be 0. 2441 */ 2442 typedef void (RETRO_CALLCONV *retro_keyboard_event_t)(bool down, unsigned keycode, 2443 uint32_t character, uint16_t key_modifiers); 2444 2445 struct retro_keyboard_callback 2446 { 2447 retro_keyboard_event_t callback; 2448 }; 2449 2450 /* Callbacks for RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE & 2451 * RETRO_ENVIRONMENT_SET_DISK_CONTROL_EXT_INTERFACE. 2452 * Should be set for implementations which can swap out multiple disk 2453 * images in runtime. 2454 * 2455 * If the implementation can do this automatically, it should strive to do so. 2456 * However, there are cases where the user must manually do so. 2457 * 2458 * Overview: To swap a disk image, eject the disk image with 2459 * set_eject_state(true). 2460 * Set the disk index with set_image_index(index). Insert the disk again 2461 * with set_eject_state(false). 2462 */ 2463 2464 /* If ejected is true, "ejects" the virtual disk tray. 2465 * When ejected, the disk image index can be set. 2466 */ 2467 typedef bool (RETRO_CALLCONV *retro_set_eject_state_t)(bool ejected); 2468 2469 /* Gets current eject state. The initial state is 'not ejected'. */ 2470 typedef bool (RETRO_CALLCONV *retro_get_eject_state_t)(void); 2471 2472 /* Gets current disk index. First disk is index 0. 2473 * If return value is >= get_num_images(), no disk is currently inserted. 2474 */ 2475 typedef unsigned (RETRO_CALLCONV *retro_get_image_index_t)(void); 2476 2477 /* Sets image index. Can only be called when disk is ejected. 2478 * The implementation supports setting "no disk" by using an 2479 * index >= get_num_images(). 2480 */ 2481 typedef bool (RETRO_CALLCONV *retro_set_image_index_t)(unsigned index); 2482 2483 /* Gets total number of images which are available to use. */ 2484 typedef unsigned (RETRO_CALLCONV *retro_get_num_images_t)(void); 2485 2486 struct retro_game_info; 2487 2488 /* Replaces the disk image associated with index. 2489 * Arguments to pass in info have same requirements as retro_load_game(). 2490 * Virtual disk tray must be ejected when calling this. 2491 * 2492 * Replacing a disk image with info = NULL will remove the disk image 2493 * from the internal list. 2494 * As a result, calls to get_image_index() can change. 2495 * 2496 * E.g. replace_image_index(1, NULL), and previous get_image_index() 2497 * returned 4 before. 2498 * Index 1 will be removed, and the new index is 3. 2499 */ 2500 typedef bool (RETRO_CALLCONV *retro_replace_image_index_t)(unsigned index, 2501 const struct retro_game_info *info); 2502 2503 /* Adds a new valid index (get_num_images()) to the internal disk list. 2504 * This will increment subsequent return values from get_num_images() by 1. 2505 * This image index cannot be used until a disk image has been set 2506 * with replace_image_index. */ 2507 typedef bool (RETRO_CALLCONV *retro_add_image_index_t)(void); 2508 2509 /* Sets initial image to insert in drive when calling 2510 * core_load_game(). 2511 * Since we cannot pass the initial index when loading 2512 * content (this would require a major API change), this 2513 * is set by the frontend *before* calling the core's 2514 * retro_load_game()/retro_load_game_special() implementation. 2515 * A core should therefore cache the index/path values and handle 2516 * them inside retro_load_game()/retro_load_game_special(). 2517 * - If 'index' is invalid (index >= get_num_images()), the 2518 * core should ignore the set value and instead use 0 2519 * - 'path' is used purely for error checking - i.e. when 2520 * content is loaded, the core should verify that the 2521 * disk specified by 'index' has the specified file path. 2522 * This is to guard against auto selecting the wrong image 2523 * if (for example) the user should modify an existing M3U 2524 * playlist. We have to let the core handle this because 2525 * set_initial_image() must be called before loading content, 2526 * i.e. the frontend cannot access image paths in advance 2527 * and thus cannot perform the error check itself. 2528 * If set path and content path do not match, the core should 2529 * ignore the set 'index' value and instead use 0 2530 * Returns 'false' if index or 'path' are invalid, or core 2531 * does not support this functionality 2532 */ 2533 typedef bool (RETRO_CALLCONV *retro_set_initial_image_t)(unsigned index, const char *path); 2534 2535 /* Fetches the path of the specified disk image file. 2536 * Returns 'false' if index is invalid (index >= get_num_images()) 2537 * or path is otherwise unavailable. 2538 */ 2539 typedef bool (RETRO_CALLCONV *retro_get_image_path_t)(unsigned index, char *path, size_t len); 2540 2541 /* Fetches a core-provided 'label' for the specified disk 2542 * image file. In the simplest case this may be a file name 2543 * (without extension), but for cores with more complex 2544 * content requirements information may be provided to 2545 * facilitate user disk swapping - for example, a core 2546 * running floppy-disk-based content may uniquely label 2547 * save disks, data disks, level disks, etc. with names 2548 * corresponding to in-game disk change prompts (so the 2549 * frontend can provide better user guidance than a 'dumb' 2550 * disk index value). 2551 * Returns 'false' if index is invalid (index >= get_num_images()) 2552 * or label is otherwise unavailable. 2553 */ 2554 typedef bool (RETRO_CALLCONV *retro_get_image_label_t)(unsigned index, char *label, size_t len); 2555 2556 struct retro_disk_control_callback 2557 { 2558 retro_set_eject_state_t set_eject_state; 2559 retro_get_eject_state_t get_eject_state; 2560 2561 retro_get_image_index_t get_image_index; 2562 retro_set_image_index_t set_image_index; 2563 retro_get_num_images_t get_num_images; 2564 2565 retro_replace_image_index_t replace_image_index; 2566 retro_add_image_index_t add_image_index; 2567 }; 2568 2569 struct retro_disk_control_ext_callback 2570 { 2571 retro_set_eject_state_t set_eject_state; 2572 retro_get_eject_state_t get_eject_state; 2573 2574 retro_get_image_index_t get_image_index; 2575 retro_set_image_index_t set_image_index; 2576 retro_get_num_images_t get_num_images; 2577 2578 retro_replace_image_index_t replace_image_index; 2579 retro_add_image_index_t add_image_index; 2580 2581 /* NOTE: Frontend will only attempt to record/restore 2582 * last used disk index if both set_initial_image() 2583 * and get_image_path() are implemented */ 2584 retro_set_initial_image_t set_initial_image; /* Optional - may be NULL */ 2585 2586 retro_get_image_path_t get_image_path; /* Optional - may be NULL */ 2587 retro_get_image_label_t get_image_label; /* Optional - may be NULL */ 2588 }; 2589 2590 enum retro_pixel_format 2591 { 2592 /* 0RGB1555, native endian. 2593 * 0 bit must be set to 0. 2594 * This pixel format is default for compatibility concerns only. 2595 * If a 15/16-bit pixel format is desired, consider using RGB565. */ 2596 RETRO_PIXEL_FORMAT_0RGB1555 = 0, 2597 2598 /* XRGB8888, native endian. 2599 * X bits are ignored. */ 2600 RETRO_PIXEL_FORMAT_XRGB8888 = 1, 2601 2602 /* RGB565, native endian. 2603 * This pixel format is the recommended format to use if a 15/16-bit 2604 * format is desired as it is the pixel format that is typically 2605 * available on a wide range of low-power devices. 2606 * 2607 * It is also natively supported in APIs like OpenGL ES. */ 2608 RETRO_PIXEL_FORMAT_RGB565 = 2, 2609 2610 /* Ensure sizeof() == sizeof(int). */ 2611 RETRO_PIXEL_FORMAT_UNKNOWN = INT_MAX 2612 }; 2613 2614 struct retro_message 2615 { 2616 const char *msg; /* Message to be displayed. */ 2617 unsigned frames; /* Duration in frames of message. */ 2618 }; 2619 2620 enum retro_message_target 2621 { 2622 RETRO_MESSAGE_TARGET_ALL = 0, 2623 RETRO_MESSAGE_TARGET_OSD, 2624 RETRO_MESSAGE_TARGET_LOG 2625 }; 2626 2627 enum retro_message_type 2628 { 2629 RETRO_MESSAGE_TYPE_NOTIFICATION = 0, 2630 RETRO_MESSAGE_TYPE_NOTIFICATION_ALT, 2631 RETRO_MESSAGE_TYPE_STATUS, 2632 RETRO_MESSAGE_TYPE_PROGRESS 2633 }; 2634 2635 struct retro_message_ext 2636 { 2637 /* Message string to be displayed/logged */ 2638 const char *msg; 2639 /* Duration (in ms) of message when targeting the OSD */ 2640 unsigned duration; 2641 /* Message priority when targeting the OSD 2642 * > When multiple concurrent messages are sent to 2643 * the frontend and the frontend does not have the 2644 * capacity to display them all, messages with the 2645 * *highest* priority value should be shown 2646 * > There is no upper limit to a message priority 2647 * value (within the bounds of the unsigned data type) 2648 * > In the reference frontend (RetroArch), the same 2649 * priority values are used for frontend-generated 2650 * notifications, which are typically assigned values 2651 * between 0 and 3 depending upon importance */ 2652 unsigned priority; 2653 /* Message logging level (info, warn, error, etc.) */ 2654 enum retro_log_level level; 2655 /* Message destination: OSD, logging interface or both */ 2656 enum retro_message_target target; 2657 /* Message 'type' when targeting the OSD 2658 * > RETRO_MESSAGE_TYPE_NOTIFICATION: Specifies that a 2659 * message should be handled in identical fashion to 2660 * a standard frontend-generated notification 2661 * > RETRO_MESSAGE_TYPE_NOTIFICATION_ALT: Specifies that 2662 * message is a notification that requires user attention 2663 * or action, but that it should be displayed in a manner 2664 * that differs from standard frontend-generated notifications. 2665 * This would typically correspond to messages that should be 2666 * displayed immediately (independently from any internal 2667 * frontend message queue), and/or which should be visually 2668 * distinguishable from frontend-generated notifications. 2669 * For example, a core may wish to inform the user of 2670 * information related to a disk-change event. It is 2671 * expected that the frontend itself may provide a 2672 * notification in this case; if the core sends a 2673 * message of type RETRO_MESSAGE_TYPE_NOTIFICATION, an 2674 * uncomfortable 'double-notification' may occur. A message 2675 * of RETRO_MESSAGE_TYPE_NOTIFICATION_ALT should therefore 2676 * be presented such that visual conflict with regular 2677 * notifications does not occur 2678 * > RETRO_MESSAGE_TYPE_STATUS: Indicates that message 2679 * is not a standard notification. This typically 2680 * corresponds to 'status' indicators, such as a core's 2681 * internal FPS, which are intended to be displayed 2682 * either permanently while a core is running, or in 2683 * a manner that does not suggest user attention or action 2684 * is required. 'Status' type messages should therefore be 2685 * displayed in a different on-screen location and in a manner 2686 * easily distinguishable from both standard frontend-generated 2687 * notifications and messages of type RETRO_MESSAGE_TYPE_NOTIFICATION_ALT 2688 * > RETRO_MESSAGE_TYPE_PROGRESS: Indicates that message reports 2689 * the progress of an internal core task. For example, in cases 2690 * where a core itself handles the loading of content from a file, 2691 * this may correspond to the percentage of the file that has been 2692 * read. Alternatively, an audio/video playback core may use a 2693 * message of type RETRO_MESSAGE_TYPE_PROGRESS to display the current 2694 * playback position as a percentage of the runtime. 'Progress' type 2695 * messages should therefore be displayed as a literal progress bar, 2696 * where: 2697 * - 'retro_message_ext.msg' is the progress bar title/label 2698 * - 'retro_message_ext.progress' determines the length of 2699 * the progress bar 2700 * NOTE: Message type is a *hint*, and may be ignored 2701 * by the frontend. If a frontend lacks support for 2702 * displaying messages via alternate means than standard 2703 * frontend-generated notifications, it will treat *all* 2704 * messages as having the type RETRO_MESSAGE_TYPE_NOTIFICATION */ 2705 enum retro_message_type type; 2706 /* Task progress when targeting the OSD and message is 2707 * of type RETRO_MESSAGE_TYPE_PROGRESS 2708 * > -1: Unmetered/indeterminate 2709 * > 0-100: Current progress percentage 2710 * NOTE: Since message type is a hint, a frontend may ignore 2711 * progress values. Where relevant, a core should therefore 2712 * include progress percentage within the message string, 2713 * such that the message intent remains clear when displayed 2714 * as a standard frontend-generated notification */ 2715 int8_t progress; 2716 }; 2717 2718 /* Describes how the libretro implementation maps a libretro input bind 2719 * to its internal input system through a human readable string. 2720 * This string can be used to better let a user configure input. */ 2721 struct retro_input_descriptor 2722 { 2723 /* Associates given parameters with a description. */ 2724 unsigned port; 2725 unsigned device; 2726 unsigned index; 2727 unsigned id; 2728 2729 /* Human readable description for parameters. 2730 * The pointer must remain valid until 2731 * retro_unload_game() is called. */ 2732 const char *description; 2733 }; 2734 2735 struct retro_system_info 2736 { 2737 /* All pointers are owned by libretro implementation, and pointers must 2738 * remain valid until it is unloaded. */ 2739 2740 const char *library_name; /* Descriptive name of library. Should not 2741 * contain any version numbers, etc. */ 2742 const char *library_version; /* Descriptive version of core. */ 2743 2744 const char *valid_extensions; /* A string listing probably content 2745 * extensions the core will be able to 2746 * load, separated with pipe. 2747 * I.e. "bin|rom|iso". 2748 * Typically used for a GUI to filter 2749 * out extensions. */ 2750 2751 /* Libretro cores that need to have direct access to their content 2752 * files, including cores which use the path of the content files to 2753 * determine the paths of other files, should set need_fullpath to true. 2754 * 2755 * Cores should strive for setting need_fullpath to false, 2756 * as it allows the frontend to perform patching, etc. 2757 * 2758 * If need_fullpath is true and retro_load_game() is called: 2759 * - retro_game_info::path is guaranteed to have a valid path 2760 * - retro_game_info::data and retro_game_info::size are invalid 2761 * 2762 * If need_fullpath is false and retro_load_game() is called: 2763 * - retro_game_info::path may be NULL 2764 * - retro_game_info::data and retro_game_info::size are guaranteed 2765 * to be valid 2766 * 2767 * See also: 2768 * - RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 2769 * - RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY 2770 */ 2771 bool need_fullpath; 2772 2773 /* If true, the frontend is not allowed to extract any archives before 2774 * loading the real content. 2775 * Necessary for certain libretro implementations that load games 2776 * from zipped archives. */ 2777 bool block_extract; 2778 }; 2779 2780 struct retro_game_geometry 2781 { 2782 unsigned base_width; /* Nominal video width of game. */ 2783 unsigned base_height; /* Nominal video height of game. */ 2784 unsigned max_width; /* Maximum possible width of game. */ 2785 unsigned max_height; /* Maximum possible height of game. */ 2786 2787 float aspect_ratio; /* Nominal aspect ratio of game. If 2788 * aspect_ratio is <= 0.0, an aspect ratio 2789 * of base_width / base_height is assumed. 2790 * A frontend could override this setting, 2791 * if desired. */ 2792 }; 2793 2794 struct retro_system_timing 2795 { 2796 double fps; /* FPS of video content. */ 2797 double sample_rate; /* Sampling rate of audio. */ 2798 }; 2799 2800 struct retro_system_av_info 2801 { 2802 struct retro_game_geometry geometry; 2803 struct retro_system_timing timing; 2804 }; 2805 2806 struct retro_variable 2807 { 2808 /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE. 2809 * If NULL, obtains the complete environment string if more 2810 * complex parsing is necessary. 2811 * The environment string is formatted as key-value pairs 2812 * delimited by semicolons as so: 2813 * "key1=value1;key2=value2;..." 2814 */ 2815 const char *key; 2816 2817 /* Value to be obtained. If key does not exist, it is set to NULL. */ 2818 const char *value; 2819 }; 2820 2821 struct retro_core_option_display 2822 { 2823 /* Variable to configure in RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY */ 2824 const char *key; 2825 2826 /* Specifies whether variable should be displayed 2827 * when presenting core options to the user */ 2828 bool visible; 2829 }; 2830 2831 /* Maximum number of values permitted for a core option 2832 * > Note: We have to set a maximum value due the limitations 2833 * of the C language - i.e. it is not possible to create an 2834 * array of structs each containing a variable sized array, 2835 * so the retro_core_option_definition values array must 2836 * have a fixed size. The size limit of 128 is a balancing 2837 * act - it needs to be large enough to support all 'sane' 2838 * core options, but setting it too large may impact low memory 2839 * platforms. In practise, if a core option has more than 2840 * 128 values then the implementation is likely flawed. 2841 * To quote the above API reference: 2842 * "The number of possible options should be very limited 2843 * i.e. it should be feasible to cycle through options 2844 * without a keyboard." 2845 */ 2846 #define RETRO_NUM_CORE_OPTION_VALUES_MAX 128 2847 2848 struct retro_core_option_value 2849 { 2850 /* Expected option value */ 2851 const char *value; 2852 2853 /* Human-readable value label. If NULL, value itself 2854 * will be displayed by the frontend */ 2855 const char *label; 2856 }; 2857 2858 struct retro_core_option_definition 2859 { 2860 /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE. */ 2861 const char *key; 2862 2863 /* Human-readable core option description (used as menu label) */ 2864 const char *desc; 2865 2866 /* Human-readable core option information (used as menu sublabel) */ 2867 const char *info; 2868 2869 /* Array of retro_core_option_value structs, terminated by NULL */ 2870 struct retro_core_option_value values[RETRO_NUM_CORE_OPTION_VALUES_MAX]; 2871 2872 /* Default core option value. Must match one of the values 2873 * in the retro_core_option_value array, otherwise will be 2874 * ignored */ 2875 const char *default_value; 2876 }; 2877 2878 struct retro_core_options_intl 2879 { 2880 /* Pointer to an array of retro_core_option_definition structs 2881 * - US English implementation 2882 * - Must point to a valid array */ 2883 struct retro_core_option_definition *us; 2884 2885 /* Pointer to an array of retro_core_option_definition structs 2886 * - Implementation for current frontend language 2887 * - May be NULL */ 2888 struct retro_core_option_definition *local; 2889 }; 2890 2891 struct retro_game_info 2892 { 2893 const char *path; /* Path to game, UTF-8 encoded. 2894 * Sometimes used as a reference for building other paths. 2895 * May be NULL if game was loaded from stdin or similar, 2896 * but in this case some cores will be unable to load `data`. 2897 * So, it is preferable to fabricate something here instead 2898 * of passing NULL, which will help more cores to succeed. 2899 * retro_system_info::need_fullpath requires 2900 * that this path is valid. */ 2901 const void *data; /* Memory buffer of loaded game. Will be NULL 2902 * if need_fullpath was set. */ 2903 size_t size; /* Size of memory buffer. */ 2904 const char *meta; /* String of implementation specific meta-data. */ 2905 }; 2906 2907 #define RETRO_MEMORY_ACCESS_WRITE (1 << 0) 2908 /* The core will write to the buffer provided by retro_framebuffer::data. */ 2909 #define RETRO_MEMORY_ACCESS_READ (1 << 1) 2910 /* The core will read from retro_framebuffer::data. */ 2911 #define RETRO_MEMORY_TYPE_CACHED (1 << 0) 2912 /* The memory in data is cached. 2913 * If not cached, random writes and/or reading from the buffer is expected to be very slow. */ 2914 struct retro_framebuffer 2915 { 2916 void *data; /* The framebuffer which the core can render into. 2917 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. 2918 The initial contents of data are unspecified. */ 2919 unsigned width; /* The framebuffer width used by the core. Set by core. */ 2920 unsigned height; /* The framebuffer height used by the core. Set by core. */ 2921 size_t pitch; /* The number of bytes between the beginning of a scanline, 2922 and beginning of the next scanline. 2923 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */ 2924 enum retro_pixel_format format; /* The pixel format the core must use to render into data. 2925 This format could differ from the format used in 2926 SET_PIXEL_FORMAT. 2927 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */ 2928 2929 unsigned access_flags; /* How the core will access the memory in the framebuffer. 2930 RETRO_MEMORY_ACCESS_* flags. 2931 Set by core. */ 2932 unsigned memory_flags; /* Flags telling core how the memory has been mapped. 2933 RETRO_MEMORY_TYPE_* flags. 2934 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */ 2935 }; 2936 2937 /* Callbacks */ 2938 2939 /* Environment callback. Gives implementations a way of performing 2940 * uncommon tasks. Extensible. */ 2941 typedef bool (RETRO_CALLCONV *retro_environment_t)(unsigned cmd, void *data); 2942 2943 /* Render a frame. Pixel format is 15-bit 0RGB1555 native endian 2944 * unless changed (see RETRO_ENVIRONMENT_SET_PIXEL_FORMAT). 2945 * 2946 * Width and height specify dimensions of buffer. 2947 * Pitch specifices length in bytes between two lines in buffer. 2948 * 2949 * For performance reasons, it is highly recommended to have a frame 2950 * that is packed in memory, i.e. pitch == width * byte_per_pixel. 2951 * Certain graphic APIs, such as OpenGL ES, do not like textures 2952 * that are not packed in memory. 2953 */ 2954 typedef void (RETRO_CALLCONV *retro_video_refresh_t)(const void *data, unsigned width, 2955 unsigned height, size_t pitch); 2956 2957 /* Renders a single audio frame. Should only be used if implementation 2958 * generates a single sample at a time. 2959 * Format is signed 16-bit native endian. 2960 */ 2961 typedef void (RETRO_CALLCONV *retro_audio_sample_t)(int16_t left, int16_t right); 2962 2963 /* Renders multiple audio frames in one go. 2964 * 2965 * One frame is defined as a sample of left and right channels, interleaved. 2966 * I.e. int16_t buf[4] = { l, r, l, r }; would be 2 frames. 2967 * Only one of the audio callbacks must ever be used. 2968 */ 2969 typedef size_t (RETRO_CALLCONV *retro_audio_sample_batch_t)(const int16_t *data, 2970 size_t frames); 2971 2972 /* Polls input. */ 2973 typedef void (RETRO_CALLCONV *retro_input_poll_t)(void); 2974 2975 /* Queries for input for player 'port'. device will be masked with 2976 * RETRO_DEVICE_MASK. 2977 * 2978 * Specialization of devices such as RETRO_DEVICE_JOYPAD_MULTITAP that 2979 * have been set with retro_set_controller_port_device() 2980 * will still use the higher level RETRO_DEVICE_JOYPAD to request input. 2981 */ 2982 typedef int16_t (RETRO_CALLCONV *retro_input_state_t)(unsigned port, unsigned device, 2983 unsigned index, unsigned id); 2984 2985 /* Sets callbacks. retro_set_environment() is guaranteed to be called 2986 * before retro_init(). 2987 * 2988 * The rest of the set_* functions are guaranteed to have been called 2989 * before the first call to retro_run() is made. */ 2990 RETRO_API void retro_set_environment(retro_environment_t); 2991 RETRO_API void retro_set_video_refresh(retro_video_refresh_t); 2992 RETRO_API void retro_set_audio_sample(retro_audio_sample_t); 2993 RETRO_API void retro_set_audio_sample_batch(retro_audio_sample_batch_t); 2994 RETRO_API void retro_set_input_poll(retro_input_poll_t); 2995 RETRO_API void retro_set_input_state(retro_input_state_t); 2996 2997 /* Library global initialization/deinitialization. */ 2998 RETRO_API void retro_init(void); 2999 RETRO_API void retro_deinit(void); 3000 3001 /* Must return RETRO_API_VERSION. Used to validate ABI compatibility 3002 * when the API is revised. */ 3003 RETRO_API unsigned retro_api_version(void); 3004 3005 /* Gets statically known system info. Pointers provided in *info 3006 * must be statically allocated. 3007 * Can be called at any time, even before retro_init(). */ 3008 RETRO_API void retro_get_system_info(struct retro_system_info *info); 3009 3010 /* Gets information about system audio/video timings and geometry. 3011 * Can be called only after retro_load_game() has successfully completed. 3012 * NOTE: The implementation of this function might not initialize every 3013 * variable if needed. 3014 * E.g. geom.aspect_ratio might not be initialized if core doesn't 3015 * desire a particular aspect ratio. */ 3016 RETRO_API void retro_get_system_av_info(struct retro_system_av_info *info); 3017 3018 /* Sets device to be used for player 'port'. 3019 * By default, RETRO_DEVICE_JOYPAD is assumed to be plugged into all 3020 * available ports. 3021 * Setting a particular device type is not a guarantee that libretro cores 3022 * will only poll input based on that particular device type. It is only a 3023 * hint to the libretro core when a core cannot automatically detect the 3024 * appropriate input device type on its own. It is also relevant when a 3025 * core can change its behavior depending on device type. 3026 * 3027 * As part of the core's implementation of retro_set_controller_port_device, 3028 * the core should call RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS to notify the 3029 * frontend if the descriptions for any controls have changed as a 3030 * result of changing the device type. 3031 */ 3032 RETRO_API void retro_set_controller_port_device(unsigned port, unsigned device); 3033 3034 /* Resets the current game. */ 3035 RETRO_API void retro_reset(void); 3036 3037 /* Runs the game for one video frame. 3038 * During retro_run(), input_poll callback must be called at least once. 3039 * 3040 * If a frame is not rendered for reasons where a game "dropped" a frame, 3041 * this still counts as a frame, and retro_run() should explicitly dupe 3042 * a frame if GET_CAN_DUPE returns true. 3043 * In this case, the video callback can take a NULL argument for data. 3044 */ 3045 RETRO_API void retro_run(void); 3046 3047 /* Returns the amount of data the implementation requires to serialize 3048 * internal state (save states). 3049 * Between calls to retro_load_game() and retro_unload_game(), the 3050 * returned size is never allowed to be larger than a previous returned 3051 * value, to ensure that the frontend can allocate a save state buffer once. 3052 */ 3053 RETRO_API size_t retro_serialize_size(void); 3054 3055 /* Serializes internal state. If failed, or size is lower than 3056 * retro_serialize_size(), it should return false, true otherwise. */ 3057 RETRO_API bool retro_serialize(void *data, size_t size); 3058 RETRO_API bool retro_unserialize(const void *data, size_t size); 3059 3060 RETRO_API void retro_cheat_reset(void); 3061 RETRO_API void retro_cheat_set(unsigned index, bool enabled, const char *code); 3062 3063 /* Loads a game. 3064 * Return true to indicate successful loading and false to indicate load failure. 3065 */ 3066 RETRO_API bool retro_load_game(const struct retro_game_info *game); 3067 3068 /* Loads a "special" kind of game. Should not be used, 3069 * except in extreme cases. */ 3070 RETRO_API bool retro_load_game_special( 3071 unsigned game_type, 3072 const struct retro_game_info *info, size_t num_info 3073 ); 3074 3075 /* Unloads the currently loaded game. Called before retro_deinit(void). */ 3076 RETRO_API void retro_unload_game(void); 3077 3078 /* Gets region of game. */ 3079 RETRO_API unsigned retro_get_region(void); 3080 3081 /* Gets region of memory. */ 3082 RETRO_API void *retro_get_memory_data(unsigned id); 3083 RETRO_API size_t retro_get_memory_size(unsigned id); 3084 3085 #ifdef __cplusplus 3086 } 3087 #endif 3088 3089 #endif 3090