src/platform/libretro/libretro.h (view raw)
1/* Copyright (C) 2010-2018 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
31extern "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 && !defined(__CELLOS_LV2__)
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 */
260enum 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_LAST,
282
283 /* Ensure sizeof(enum) == sizeof(int) */
284 RETRO_LANGUAGE_DUMMY = INT_MAX
285};
286
287/* Passed to retro_get_memory_data/size().
288 * If the memory type doesn't apply to the
289 * implementation NULL/0 can be returned.
290 */
291#define RETRO_MEMORY_MASK 0xff
292
293/* Regular save RAM. This RAM is usually found on a game cartridge,
294 * backed up by a battery.
295 * If save game data is too complex for a single memory buffer,
296 * the SAVE_DIRECTORY (preferably) or SYSTEM_DIRECTORY environment
297 * callback can be used. */
298#define RETRO_MEMORY_SAVE_RAM 0
299
300/* Some games have a built-in clock to keep track of time.
301 * This memory is usually just a couple of bytes to keep track of time.
302 */
303#define RETRO_MEMORY_RTC 1
304
305/* System ram lets a frontend peek into a game systems main RAM. */
306#define RETRO_MEMORY_SYSTEM_RAM 2
307
308/* Video ram lets a frontend peek into a game systems video RAM (VRAM). */
309#define RETRO_MEMORY_VIDEO_RAM 3
310
311/* Keysyms used for ID in input state callback when polling RETRO_KEYBOARD. */
312enum retro_key
313{
314 RETROK_UNKNOWN = 0,
315 RETROK_FIRST = 0,
316 RETROK_BACKSPACE = 8,
317 RETROK_TAB = 9,
318 RETROK_CLEAR = 12,
319 RETROK_RETURN = 13,
320 RETROK_PAUSE = 19,
321 RETROK_ESCAPE = 27,
322 RETROK_SPACE = 32,
323 RETROK_EXCLAIM = 33,
324 RETROK_QUOTEDBL = 34,
325 RETROK_HASH = 35,
326 RETROK_DOLLAR = 36,
327 RETROK_AMPERSAND = 38,
328 RETROK_QUOTE = 39,
329 RETROK_LEFTPAREN = 40,
330 RETROK_RIGHTPAREN = 41,
331 RETROK_ASTERISK = 42,
332 RETROK_PLUS = 43,
333 RETROK_COMMA = 44,
334 RETROK_MINUS = 45,
335 RETROK_PERIOD = 46,
336 RETROK_SLASH = 47,
337 RETROK_0 = 48,
338 RETROK_1 = 49,
339 RETROK_2 = 50,
340 RETROK_3 = 51,
341 RETROK_4 = 52,
342 RETROK_5 = 53,
343 RETROK_6 = 54,
344 RETROK_7 = 55,
345 RETROK_8 = 56,
346 RETROK_9 = 57,
347 RETROK_COLON = 58,
348 RETROK_SEMICOLON = 59,
349 RETROK_LESS = 60,
350 RETROK_EQUALS = 61,
351 RETROK_GREATER = 62,
352 RETROK_QUESTION = 63,
353 RETROK_AT = 64,
354 RETROK_LEFTBRACKET = 91,
355 RETROK_BACKSLASH = 92,
356 RETROK_RIGHTBRACKET = 93,
357 RETROK_CARET = 94,
358 RETROK_UNDERSCORE = 95,
359 RETROK_BACKQUOTE = 96,
360 RETROK_a = 97,
361 RETROK_b = 98,
362 RETROK_c = 99,
363 RETROK_d = 100,
364 RETROK_e = 101,
365 RETROK_f = 102,
366 RETROK_g = 103,
367 RETROK_h = 104,
368 RETROK_i = 105,
369 RETROK_j = 106,
370 RETROK_k = 107,
371 RETROK_l = 108,
372 RETROK_m = 109,
373 RETROK_n = 110,
374 RETROK_o = 111,
375 RETROK_p = 112,
376 RETROK_q = 113,
377 RETROK_r = 114,
378 RETROK_s = 115,
379 RETROK_t = 116,
380 RETROK_u = 117,
381 RETROK_v = 118,
382 RETROK_w = 119,
383 RETROK_x = 120,
384 RETROK_y = 121,
385 RETROK_z = 122,
386 RETROK_LEFTBRACE = 123,
387 RETROK_BAR = 124,
388 RETROK_RIGHTBRACE = 125,
389 RETROK_TILDE = 126,
390 RETROK_DELETE = 127,
391
392 RETROK_KP0 = 256,
393 RETROK_KP1 = 257,
394 RETROK_KP2 = 258,
395 RETROK_KP3 = 259,
396 RETROK_KP4 = 260,
397 RETROK_KP5 = 261,
398 RETROK_KP6 = 262,
399 RETROK_KP7 = 263,
400 RETROK_KP8 = 264,
401 RETROK_KP9 = 265,
402 RETROK_KP_PERIOD = 266,
403 RETROK_KP_DIVIDE = 267,
404 RETROK_KP_MULTIPLY = 268,
405 RETROK_KP_MINUS = 269,
406 RETROK_KP_PLUS = 270,
407 RETROK_KP_ENTER = 271,
408 RETROK_KP_EQUALS = 272,
409
410 RETROK_UP = 273,
411 RETROK_DOWN = 274,
412 RETROK_RIGHT = 275,
413 RETROK_LEFT = 276,
414 RETROK_INSERT = 277,
415 RETROK_HOME = 278,
416 RETROK_END = 279,
417 RETROK_PAGEUP = 280,
418 RETROK_PAGEDOWN = 281,
419
420 RETROK_F1 = 282,
421 RETROK_F2 = 283,
422 RETROK_F3 = 284,
423 RETROK_F4 = 285,
424 RETROK_F5 = 286,
425 RETROK_F6 = 287,
426 RETROK_F7 = 288,
427 RETROK_F8 = 289,
428 RETROK_F9 = 290,
429 RETROK_F10 = 291,
430 RETROK_F11 = 292,
431 RETROK_F12 = 293,
432 RETROK_F13 = 294,
433 RETROK_F14 = 295,
434 RETROK_F15 = 296,
435
436 RETROK_NUMLOCK = 300,
437 RETROK_CAPSLOCK = 301,
438 RETROK_SCROLLOCK = 302,
439 RETROK_RSHIFT = 303,
440 RETROK_LSHIFT = 304,
441 RETROK_RCTRL = 305,
442 RETROK_LCTRL = 306,
443 RETROK_RALT = 307,
444 RETROK_LALT = 308,
445 RETROK_RMETA = 309,
446 RETROK_LMETA = 310,
447 RETROK_LSUPER = 311,
448 RETROK_RSUPER = 312,
449 RETROK_MODE = 313,
450 RETROK_COMPOSE = 314,
451
452 RETROK_HELP = 315,
453 RETROK_PRINT = 316,
454 RETROK_SYSREQ = 317,
455 RETROK_BREAK = 318,
456 RETROK_MENU = 319,
457 RETROK_POWER = 320,
458 RETROK_EURO = 321,
459 RETROK_UNDO = 322,
460 RETROK_OEM_102 = 323,
461
462 RETROK_LAST,
463
464 RETROK_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
465};
466
467enum retro_mod
468{
469 RETROKMOD_NONE = 0x0000,
470
471 RETROKMOD_SHIFT = 0x01,
472 RETROKMOD_CTRL = 0x02,
473 RETROKMOD_ALT = 0x04,
474 RETROKMOD_META = 0x08,
475
476 RETROKMOD_NUMLOCK = 0x10,
477 RETROKMOD_CAPSLOCK = 0x20,
478 RETROKMOD_SCROLLOCK = 0x40,
479
480 RETROKMOD_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
481};
482
483/* If set, this call is not part of the public libretro API yet. It can
484 * change or be removed at any time. */
485#define RETRO_ENVIRONMENT_EXPERIMENTAL 0x10000
486/* Environment callback to be used internally in frontend. */
487#define RETRO_ENVIRONMENT_PRIVATE 0x20000
488
489/* Environment commands. */
490#define RETRO_ENVIRONMENT_SET_ROTATION 1 /* const unsigned * --
491 * Sets screen rotation of graphics.
492 * Valid values are 0, 1, 2, 3, which rotates screen by 0, 90, 180,
493 * 270 degrees counter-clockwise respectively.
494 */
495#define RETRO_ENVIRONMENT_GET_OVERSCAN 2 /* bool * --
496 * NOTE: As of 2019 this callback is considered deprecated in favor of
497 * using core options to manage overscan in a more nuanced, core-specific way.
498 *
499 * Boolean value whether or not the implementation should use overscan,
500 * or crop away overscan.
501 */
502#define RETRO_ENVIRONMENT_GET_CAN_DUPE 3 /* bool * --
503 * Boolean value whether or not frontend supports frame duping,
504 * passing NULL to video frame callback.
505 */
506
507 /* Environ 4, 5 are no longer supported (GET_VARIABLE / SET_VARIABLES),
508 * and reserved to avoid possible ABI clash.
509 */
510
511#define RETRO_ENVIRONMENT_SET_MESSAGE 6 /* const struct retro_message * --
512 * Sets a message to be displayed in implementation-specific manner
513 * for a certain amount of 'frames'.
514 * Should not be used for trivial messages, which should simply be
515 * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a
516 * fallback, stderr).
517 */
518#define RETRO_ENVIRONMENT_SHUTDOWN 7 /* N/A (NULL) --
519 * Requests the frontend to shutdown.
520 * Should only be used if game has a specific
521 * way to shutdown the game from a menu item or similar.
522 */
523#define RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL 8
524 /* const unsigned * --
525 * Gives a hint to the frontend how demanding this implementation
526 * is on a system. E.g. reporting a level of 2 means
527 * this implementation should run decently on all frontends
528 * of level 2 and up.
529 *
530 * It can be used by the frontend to potentially warn
531 * about too demanding implementations.
532 *
533 * The levels are "floating".
534 *
535 * This function can be called on a per-game basis,
536 * as certain games an implementation can play might be
537 * particularly demanding.
538 * If called, it should be called in retro_load_game().
539 */
540#define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9
541 /* const char ** --
542 * Returns the "system" directory of the frontend.
543 * This directory can be used to store system specific
544 * content such as BIOSes, configuration data, etc.
545 * The returned value can be NULL.
546 * If so, no such directory is defined,
547 * and it's up to the implementation to find a suitable directory.
548 *
549 * NOTE: Some cores used this folder also for "save" data such as
550 * memory cards, etc, for lack of a better place to put it.
551 * This is now discouraged, and if possible, cores should try to
552 * use the new GET_SAVE_DIRECTORY.
553 */
554#define RETRO_ENVIRONMENT_SET_PIXEL_FORMAT 10
555 /* const enum retro_pixel_format * --
556 * Sets the internal pixel format used by the implementation.
557 * The default pixel format is RETRO_PIXEL_FORMAT_0RGB1555.
558 * This pixel format however, is deprecated (see enum retro_pixel_format).
559 * If the call returns false, the frontend does not support this pixel
560 * format.
561 *
562 * This function should be called inside retro_load_game() or
563 * retro_get_system_av_info().
564 */
565#define RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS 11
566 /* const struct retro_input_descriptor * --
567 * Sets an array of retro_input_descriptors.
568 * It is up to the frontend to present this in a usable way.
569 * The array is terminated by retro_input_descriptor::description
570 * being set to NULL.
571 * This function can be called at any time, but it is recommended
572 * to call it as early as possible.
573 */
574#define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12
575 /* const struct retro_keyboard_callback * --
576 * Sets a callback function used to notify core about keyboard events.
577 */
578#define RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE 13
579 /* const struct retro_disk_control_callback * --
580 * Sets an interface which frontend can use to eject and insert
581 * disk images.
582 * This is used for games which consist of multiple images and
583 * must be manually swapped out by the user (e.g. PSX).
584 */
585#define RETRO_ENVIRONMENT_SET_HW_RENDER 14
586 /* struct retro_hw_render_callback * --
587 * Sets an interface to let a libretro core render with
588 * hardware acceleration.
589 * Should be called in retro_load_game().
590 * If successful, libretro cores will be able to render to a
591 * frontend-provided framebuffer.
592 * The size of this framebuffer will be at least as large as
593 * max_width/max_height provided in get_av_info().
594 * If HW rendering is used, pass only RETRO_HW_FRAME_BUFFER_VALID or
595 * NULL to retro_video_refresh_t.
596 */
597#define RETRO_ENVIRONMENT_GET_VARIABLE 15
598 /* struct retro_variable * --
599 * Interface to acquire user-defined information from environment
600 * that cannot feasibly be supported in a multi-system way.
601 * 'key' should be set to a key which has already been set by
602 * SET_VARIABLES.
603 * 'data' will be set to a value or NULL.
604 */
605#define RETRO_ENVIRONMENT_SET_VARIABLES 16
606 /* const struct retro_variable * --
607 * Allows an implementation to signal the environment
608 * which variables it might want to check for later using
609 * GET_VARIABLE.
610 * This allows the frontend to present these variables to
611 * a user dynamically.
612 * This should be called the first time as early as
613 * possible (ideally in retro_set_environment).
614 * Afterward it may be called again for the core to communicate
615 * updated options to the frontend, but the number of core
616 * options must not change from the number in the initial call.
617 *
618 * 'data' points to an array of retro_variable structs
619 * terminated by a { NULL, NULL } element.
620 * retro_variable::key should be namespaced to not collide
621 * with other implementations' keys. E.g. A core called
622 * 'foo' should use keys named as 'foo_option'.
623 * retro_variable::value should contain a human readable
624 * description of the key as well as a '|' delimited list
625 * of expected values.
626 *
627 * The number of possible options should be very limited,
628 * i.e. it should be feasible to cycle through options
629 * without a keyboard.
630 *
631 * First entry should be treated as a default.
632 *
633 * Example entry:
634 * { "foo_option", "Speed hack coprocessor X; false|true" }
635 *
636 * Text before first ';' is description. This ';' must be
637 * followed by a space, and followed by a list of possible
638 * values split up with '|'.
639 *
640 * Only strings are operated on. The possible values will
641 * generally be displayed and stored as-is by the frontend.
642 */
643#define RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE 17
644 /* bool * --
645 * Result is set to true if some variables are updated by
646 * frontend since last call to RETRO_ENVIRONMENT_GET_VARIABLE.
647 * Variables should be queried with GET_VARIABLE.
648 */
649#define RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME 18
650 /* const bool * --
651 * If true, the libretro implementation supports calls to
652 * retro_load_game() with NULL as argument.
653 * Used by cores which can run without particular game data.
654 * This should be called within retro_set_environment() only.
655 */
656#define RETRO_ENVIRONMENT_GET_LIBRETRO_PATH 19
657 /* const char ** --
658 * Retrieves the absolute path from where this libretro
659 * implementation was loaded.
660 * NULL is returned if the libretro was loaded statically
661 * (i.e. linked statically to frontend), or if the path cannot be
662 * determined.
663 * Mostly useful in cooperation with SET_SUPPORT_NO_GAME as assets can
664 * be loaded without ugly hacks.
665 */
666
667 /* Environment 20 was an obsolete version of SET_AUDIO_CALLBACK.
668 * It was not used by any known core at the time,
669 * and was removed from the API. */
670#define RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK 21
671 /* const struct retro_frame_time_callback * --
672 * Lets the core know how much time has passed since last
673 * invocation of retro_run().
674 * The frontend can tamper with the timing to fake fast-forward,
675 * slow-motion, frame stepping, etc.
676 * In this case the delta time will use the reference value
677 * in frame_time_callback..
678 */
679#define RETRO_ENVIRONMENT_SET_AUDIO_CALLBACK 22
680 /* const struct retro_audio_callback * --
681 * Sets an interface which is used to notify a libretro core about audio
682 * being available for writing.
683 * The callback can be called from any thread, so a core using this must
684 * have a thread safe audio implementation.
685 * It is intended for games where audio and video are completely
686 * asynchronous and audio can be generated on the fly.
687 * This interface is not recommended for use with emulators which have
688 * highly synchronous audio.
689 *
690 * The callback only notifies about writability; the libretro core still
691 * has to call the normal audio callbacks
692 * to write audio. The audio callbacks must be called from within the
693 * notification callback.
694 * The amount of audio data to write is up to the implementation.
695 * Generally, the audio callback will be called continously in a loop.
696 *
697 * Due to thread safety guarantees and lack of sync between audio and
698 * video, a frontend can selectively disallow this interface based on
699 * internal configuration. A core using this interface must also
700 * implement the "normal" audio interface.
701 *
702 * A libretro core using SET_AUDIO_CALLBACK should also make use of
703 * SET_FRAME_TIME_CALLBACK.
704 */
705#define RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE 23
706 /* struct retro_rumble_interface * --
707 * Gets an interface which is used by a libretro core to set
708 * state of rumble motors in controllers.
709 * A strong and weak motor is supported, and they can be
710 * controlled indepedently.
711 */
712#define RETRO_ENVIRONMENT_GET_INPUT_DEVICE_CAPABILITIES 24
713 /* uint64_t * --
714 * Gets a bitmask telling which device type are expected to be
715 * handled properly in a call to retro_input_state_t.
716 * Devices which are not handled or recognized always return
717 * 0 in retro_input_state_t.
718 * Example bitmask: caps = (1 << RETRO_DEVICE_JOYPAD) | (1 << RETRO_DEVICE_ANALOG).
719 * Should only be called in retro_run().
720 */
721#define RETRO_ENVIRONMENT_GET_SENSOR_INTERFACE (25 | RETRO_ENVIRONMENT_EXPERIMENTAL)
722 /* struct retro_sensor_interface * --
723 * Gets access to the sensor interface.
724 * The purpose of this interface is to allow
725 * setting state related to sensors such as polling rate,
726 * enabling/disable it entirely, etc.
727 * Reading sensor state is done via the normal
728 * input_state_callback API.
729 */
730#define RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE (26 | RETRO_ENVIRONMENT_EXPERIMENTAL)
731 /* struct retro_camera_callback * --
732 * Gets an interface to a video camera driver.
733 * A libretro core can use this interface to get access to a
734 * video camera.
735 * New video frames are delivered in a callback in same
736 * thread as retro_run().
737 *
738 * GET_CAMERA_INTERFACE should be called in retro_load_game().
739 *
740 * Depending on the camera implementation used, camera frames
741 * will be delivered as a raw framebuffer,
742 * or as an OpenGL texture directly.
743 *
744 * The core has to tell the frontend here which types of
745 * buffers can be handled properly.
746 * An OpenGL texture can only be handled when using a
747 * libretro GL core (SET_HW_RENDER).
748 * It is recommended to use a libretro GL core when
749 * using camera interface.
750 *
751 * The camera is not started automatically. The retrieved start/stop
752 * functions must be used to explicitly
753 * start and stop the camera driver.
754 */
755#define RETRO_ENVIRONMENT_GET_LOG_INTERFACE 27
756 /* struct retro_log_callback * --
757 * Gets an interface for logging. This is useful for
758 * logging in a cross-platform way
759 * as certain platforms cannot use stderr for logging.
760 * It also allows the frontend to
761 * show logging information in a more suitable way.
762 * If this interface is not used, libretro cores should
763 * log to stderr as desired.
764 */
765#define RETRO_ENVIRONMENT_GET_PERF_INTERFACE 28
766 /* struct retro_perf_callback * --
767 * Gets an interface for performance counters. This is useful
768 * for performance logging in a cross-platform way and for detecting
769 * architecture-specific features, such as SIMD support.
770 */
771#define RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE 29
772 /* struct retro_location_callback * --
773 * Gets access to the location interface.
774 * The purpose of this interface is to be able to retrieve
775 * location-based information from the host device,
776 * such as current latitude / longitude.
777 */
778#define RETRO_ENVIRONMENT_GET_CONTENT_DIRECTORY 30 /* Old name, kept for compatibility. */
779#define RETRO_ENVIRONMENT_GET_CORE_ASSETS_DIRECTORY 30
780 /* const char ** --
781 * Returns the "core assets" directory of the frontend.
782 * This directory can be used to store specific assets that the
783 * core relies upon, such as art assets,
784 * input data, etc etc.
785 * The returned value can be NULL.
786 * If so, no such directory is defined,
787 * and it's up to the implementation to find a suitable directory.
788 */
789#define RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY 31
790 /* const char ** --
791 * Returns the "save" directory of the frontend, unless there is no
792 * save directory available. The save directory should be used to
793 * store SRAM, memory cards, high scores, etc, if the libretro core
794 * cannot use the regular memory interface (retro_get_memory_data()).
795 *
796 * If the frontend cannot designate a save directory, it will return
797 * NULL to indicate that the core should attempt to operate without a
798 * save directory set.
799 *
800 * NOTE: early libretro cores used the system directory for save
801 * files. Cores that need to be backwards-compatible can still check
802 * GET_SYSTEM_DIRECTORY.
803 */
804#define RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO 32
805 /* const struct retro_system_av_info * --
806 * Sets a new av_info structure. This can only be called from
807 * within retro_run().
808 * This should *only* be used if the core is completely altering the
809 * internal resolutions, aspect ratios, timings, sampling rate, etc.
810 * Calling this can require a full reinitialization of video/audio
811 * drivers in the frontend,
812 *
813 * so it is important to call it very sparingly, and usually only with
814 * the users explicit consent.
815 * An eventual driver reinitialize will happen so that video and
816 * audio callbacks
817 * happening after this call within the same retro_run() call will
818 * target the newly initialized driver.
819 *
820 * This callback makes it possible to support configurable resolutions
821 * in games, which can be useful to
822 * avoid setting the "worst case" in max_width/max_height.
823 *
824 * ***HIGHLY RECOMMENDED*** Do not call this callback every time
825 * resolution changes in an emulator core if it's
826 * expected to be a temporary change, for the reasons of possible
827 * driver reinitialization.
828 * This call is not a free pass for not trying to provide
829 * correct values in retro_get_system_av_info(). If you need to change
830 * things like aspect ratio or nominal width/height,
831 * use RETRO_ENVIRONMENT_SET_GEOMETRY, which is a softer variant
832 * of SET_SYSTEM_AV_INFO.
833 *
834 * If this returns false, the frontend does not acknowledge a
835 * changed av_info struct.
836 */
837#define RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK 33
838 /* const struct retro_get_proc_address_interface * --
839 * Allows a libretro core to announce support for the
840 * get_proc_address() interface.
841 * This interface allows for a standard way to extend libretro where
842 * use of environment calls are too indirect,
843 * e.g. for cases where the frontend wants to call directly into the core.
844 *
845 * If a core wants to expose this interface, SET_PROC_ADDRESS_CALLBACK
846 * **MUST** be called from within retro_set_environment().
847 */
848#define RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO 34
849 /* const struct retro_subsystem_info * --
850 * This environment call introduces the concept of libretro "subsystems".
851 * A subsystem is a variant of a libretro core which supports
852 * different kinds of games.
853 * The purpose of this is to support e.g. emulators which might
854 * have special needs, e.g. Super Nintendo's Super GameBoy, Sufami Turbo.
855 * It can also be used to pick among subsystems in an explicit way
856 * if the libretro implementation is a multi-system emulator itself.
857 *
858 * Loading a game via a subsystem is done with retro_load_game_special(),
859 * and this environment call allows a libretro core to expose which
860 * subsystems are supported for use with retro_load_game_special().
861 * A core passes an array of retro_game_special_info which is terminated
862 * with a zeroed out retro_game_special_info struct.
863 *
864 * If a core wants to use this functionality, SET_SUBSYSTEM_INFO
865 * **MUST** be called from within retro_set_environment().
866 */
867#define RETRO_ENVIRONMENT_SET_CONTROLLER_INFO 35
868 /* const struct retro_controller_info * --
869 * This environment call lets a libretro core tell the frontend
870 * which controller subclasses are recognized in calls to
871 * retro_set_controller_port_device().
872 *
873 * Some emulators such as Super Nintendo support multiple lightgun
874 * types which must be specifically selected from. It is therefore
875 * sometimes necessary for a frontend to be able to tell the core
876 * about a special kind of input device which is not specifcally
877 * provided by the Libretro API.
878 *
879 * In order for a frontend to understand the workings of those devices,
880 * they must be defined as a specialized subclass of the generic device
881 * types already defined in the libretro API.
882 *
883 * The core must pass an array of const struct retro_controller_info which
884 * is terminated with a blanked out struct. Each element of the
885 * retro_controller_info struct corresponds to the ascending port index
886 * that is passed to retro_set_controller_port_device() when that function
887 * is called to indicate to the core that the frontend has changed the
888 * active device subclass. SEE ALSO: retro_set_controller_port_device()
889 *
890 * The ascending input port indexes provided by the core in the struct
891 * are generally presented by frontends as ascending User # or Player #,
892 * such as Player 1, Player 2, Player 3, etc. Which device subclasses are
893 * supported can vary per input port.
894 *
895 * The first inner element of each entry in the retro_controller_info array
896 * is a retro_controller_description struct that specifies the names and
897 * codes of all device subclasses that are available for the corresponding
898 * User or Player, beginning with the generic Libretro device that the
899 * subclasses are derived from. The second inner element of each entry is the
900 * total number of subclasses that are listed in the retro_controller_description.
901 *
902 * NOTE: Even if special device types are set in the libretro core,
903 * libretro should only poll input based on the base input device types.
904 */
905#define RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL)
906 /* const struct retro_memory_map * --
907 * This environment call lets a libretro core tell the frontend
908 * about the memory maps this core emulates.
909 * This can be used to implement, for example, cheats in a core-agnostic way.
910 *
911 * Should only be used by emulators; it doesn't make much sense for
912 * anything else.
913 * It is recommended to expose all relevant pointers through
914 * retro_get_memory_* as well.
915 *
916 * Can be called from retro_init and retro_load_game.
917 */
918#define RETRO_ENVIRONMENT_SET_GEOMETRY 37
919 /* const struct retro_game_geometry * --
920 * This environment call is similar to SET_SYSTEM_AV_INFO for changing
921 * video parameters, but provides a guarantee that drivers will not be
922 * reinitialized.
923 * This can only be called from within retro_run().
924 *
925 * The purpose of this call is to allow a core to alter nominal
926 * width/heights as well as aspect ratios on-the-fly, which can be
927 * useful for some emulators to change in run-time.
928 *
929 * max_width/max_height arguments are ignored and cannot be changed
930 * with this call as this could potentially require a reinitialization or a
931 * non-constant time operation.
932 * If max_width/max_height are to be changed, SET_SYSTEM_AV_INFO is required.
933 *
934 * A frontend must guarantee that this environment call completes in
935 * constant time.
936 */
937#define RETRO_ENVIRONMENT_GET_USERNAME 38
938 /* const char **
939 * Returns the specified username of the frontend, if specified by the user.
940 * This username can be used as a nickname for a core that has online facilities
941 * or any other mode where personalization of the user is desirable.
942 * The returned value can be NULL.
943 * If this environ callback is used by a core that requires a valid username,
944 * a default username should be specified by the core.
945 */
946#define RETRO_ENVIRONMENT_GET_LANGUAGE 39
947 /* unsigned * --
948 * Returns the specified language of the frontend, if specified by the user.
949 * It can be used by the core for localization purposes.
950 */
951#define RETRO_ENVIRONMENT_GET_CURRENT_SOFTWARE_FRAMEBUFFER (40 | RETRO_ENVIRONMENT_EXPERIMENTAL)
952 /* struct retro_framebuffer * --
953 * Returns a preallocated framebuffer which the core can use for rendering
954 * the frame into when not using SET_HW_RENDER.
955 * The framebuffer returned from this call must not be used
956 * after the current call to retro_run() returns.
957 *
958 * The goal of this call is to allow zero-copy behavior where a core
959 * can render directly into video memory, avoiding extra bandwidth cost by copying
960 * memory from core to video memory.
961 *
962 * If this call succeeds and the core renders into it,
963 * the framebuffer pointer and pitch can be passed to retro_video_refresh_t.
964 * If the buffer from GET_CURRENT_SOFTWARE_FRAMEBUFFER is to be used,
965 * the core must pass the exact
966 * same pointer as returned by GET_CURRENT_SOFTWARE_FRAMEBUFFER;
967 * i.e. passing a pointer which is offset from the
968 * buffer is undefined. The width, height and pitch parameters
969 * must also match exactly to the values obtained from GET_CURRENT_SOFTWARE_FRAMEBUFFER.
970 *
971 * It is possible for a frontend to return a different pixel format
972 * than the one used in SET_PIXEL_FORMAT. This can happen if the frontend
973 * needs to perform conversion.
974 *
975 * It is still valid for a core to render to a different buffer
976 * even if GET_CURRENT_SOFTWARE_FRAMEBUFFER succeeds.
977 *
978 * A frontend must make sure that the pointer obtained from this function is
979 * writeable (and readable).
980 */
981#define RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE (41 | RETRO_ENVIRONMENT_EXPERIMENTAL)
982 /* const struct retro_hw_render_interface ** --
983 * Returns an API specific rendering interface for accessing API specific data.
984 * Not all HW rendering APIs support or need this.
985 * The contents of the returned pointer is specific to the rendering API
986 * being used. See the various headers like libretro_vulkan.h, etc.
987 *
988 * GET_HW_RENDER_INTERFACE cannot be called before context_reset has been called.
989 * Similarly, after context_destroyed callback returns,
990 * the contents of the HW_RENDER_INTERFACE are invalidated.
991 */
992#define RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS (42 | RETRO_ENVIRONMENT_EXPERIMENTAL)
993 /* const bool * --
994 * If true, the libretro implementation supports achievements
995 * either via memory descriptors set with RETRO_ENVIRONMENT_SET_MEMORY_MAPS
996 * or via retro_get_memory_data/retro_get_memory_size.
997 *
998 * This must be called before the first call to retro_run.
999 */
1000#define RETRO_ENVIRONMENT_SET_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE (43 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1001 /* const struct retro_hw_render_context_negotiation_interface * --
1002 * Sets an interface which lets the libretro core negotiate with frontend how a context is created.
1003 * The semantics of this interface depends on which API is used in SET_HW_RENDER earlier.
1004 * This interface will be used when the frontend is trying to create a HW rendering context,
1005 * so it will be used after SET_HW_RENDER, but before the context_reset callback.
1006 */
1007#define RETRO_ENVIRONMENT_SET_SERIALIZATION_QUIRKS 44
1008 /* uint64_t * --
1009 * Sets quirk flags associated with serialization. The frontend will zero any flags it doesn't
1010 * recognize or support. Should be set in either retro_init or retro_load_game, but not both.
1011 */
1012#define RETRO_ENVIRONMENT_SET_HW_SHARED_CONTEXT (44 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1013 /* N/A (null) * --
1014 * The frontend will try to use a 'shared' hardware context (mostly applicable
1015 * to OpenGL) when a hardware context is being set up.
1016 *
1017 * Returns true if the frontend supports shared hardware contexts and false
1018 * if the frontend does not support shared hardware contexts.
1019 *
1020 * This will do nothing on its own until SET_HW_RENDER env callbacks are
1021 * being used.
1022 */
1023#define RETRO_ENVIRONMENT_GET_VFS_INTERFACE (45 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1024 /* struct retro_vfs_interface_info * --
1025 * Gets access to the VFS interface.
1026 * VFS presence needs to be queried prior to load_game or any
1027 * get_system/save/other_directory being called to let front end know
1028 * core supports VFS before it starts handing out paths.
1029 * It is recomended to do so in retro_set_environment
1030 */
1031#define RETRO_ENVIRONMENT_GET_LED_INTERFACE (46 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1032 /* struct retro_led_interface * --
1033 * Gets an interface which is used by a libretro core to set
1034 * state of LEDs.
1035 */
1036#define RETRO_ENVIRONMENT_GET_AUDIO_VIDEO_ENABLE (47 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1037 /* int * --
1038 * Tells the core if the frontend wants audio or video.
1039 * If disabled, the frontend will discard the audio or video,
1040 * so the core may decide to skip generating a frame or generating audio.
1041 * This is mainly used for increasing performance.
1042 * Bit 0 (value 1): Enable Video
1043 * Bit 1 (value 2): Enable Audio
1044 * Bit 2 (value 4): Use Fast Savestates.
1045 * Bit 3 (value 8): Hard Disable Audio
1046 * Other bits are reserved for future use and will default to zero.
1047 * If video is disabled:
1048 * * The frontend wants the core to not generate any video,
1049 * including presenting frames via hardware acceleration.
1050 * * The frontend's video frame callback will do nothing.
1051 * * After running the frame, the video output of the next frame should be
1052 * no different than if video was enabled, and saving and loading state
1053 * should have no issues.
1054 * If audio is disabled:
1055 * * The frontend wants the core to not generate any audio.
1056 * * The frontend's audio callbacks will do nothing.
1057 * * After running the frame, the audio output of the next frame should be
1058 * no different than if audio was enabled, and saving and loading state
1059 * should have no issues.
1060 * Fast Savestates:
1061 * * Guaranteed to be created by the same binary that will load them.
1062 * * Will not be written to or read from the disk.
1063 * * Suggest that the core assumes loading state will succeed.
1064 * * Suggest that the core updates its memory buffers in-place if possible.
1065 * * Suggest that the core skips clearing memory.
1066 * * Suggest that the core skips resetting the system.
1067 * * Suggest that the core may skip validation steps.
1068 * Hard Disable Audio:
1069 * * Used for a secondary core when running ahead.
1070 * * Indicates that the frontend will never need audio from the core.
1071 * * Suggests that the core may stop synthesizing audio, but this should not
1072 * compromise emulation accuracy.
1073 * * Audio output for the next frame does not matter, and the frontend will
1074 * never need an accurate audio state in the future.
1075 * * State will never be saved when using Hard Disable Audio.
1076 */
1077#define RETRO_ENVIRONMENT_GET_MIDI_INTERFACE (48 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1078 /* struct retro_midi_interface ** --
1079 * Returns a MIDI interface that can be used for raw data I/O.
1080 */
1081
1082#define RETRO_ENVIRONMENT_GET_FASTFORWARDING (49 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1083 /* bool * --
1084 * Boolean value that indicates whether or not the frontend is in
1085 * fastforwarding mode.
1086 */
1087
1088#define RETRO_ENVIRONMENT_GET_TARGET_REFRESH_RATE (50 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1089 /* float * --
1090 * Float value that lets us know what target refresh rate
1091 * is curently in use by the frontend.
1092 *
1093 * The core can use the returned value to set an ideal
1094 * refresh rate/framerate.
1095 */
1096
1097#define RETRO_ENVIRONMENT_GET_INPUT_BITMASKS (51 | RETRO_ENVIRONMENT_EXPERIMENTAL)
1098 /* bool * --
1099 * Boolean value that indicates whether or not the frontend supports
1100 * input bitmasks being returned by retro_input_state_t. The advantage
1101 * of this is that retro_input_state_t has to be only called once to
1102 * grab all button states instead of multiple times.
1103 *
1104 * If it returns true, you can pass RETRO_DEVICE_ID_JOYPAD_MASK as 'id'
1105 * to retro_input_state_t (make sure 'device' is set to RETRO_DEVICE_JOYPAD).
1106 * It will return a bitmask of all the digital buttons.
1107 */
1108
1109#define RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION 52
1110 /* unsigned * --
1111 * Unsigned value is the API version number of the core options
1112 * interface supported by the frontend. If callback return false,
1113 * API version is assumed to be 0.
1114 *
1115 * In legacy code, core options are set by passing an array of
1116 * retro_variable structs to RETRO_ENVIRONMENT_SET_VARIABLES.
1117 * This may be still be done regardless of the core options
1118 * interface version.
1119 *
1120 * If version is >= 1 however, core options may instead be set by
1121 * passing an array of retro_core_option_definition structs to
1122 * RETRO_ENVIRONMENT_SET_CORE_OPTIONS, or a 2D array of
1123 * retro_core_option_definition structs to RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL.
1124 * This allows the core to additionally set option sublabel information
1125 * and/or provide localisation support.
1126 */
1127
1128#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS 53
1129 /* const struct retro_core_option_definition ** --
1130 * Allows an implementation to signal the environment
1131 * which variables it might want to check for later using
1132 * GET_VARIABLE.
1133 * This allows the frontend to present these variables to
1134 * a user dynamically.
1135 * This should only be called if RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION
1136 * returns an API version of >= 1.
1137 * This should be called instead of RETRO_ENVIRONMENT_SET_VARIABLES.
1138 * This should be called the first time as early as
1139 * possible (ideally in retro_set_environment).
1140 * Afterwards it may be called again for the core to communicate
1141 * updated options to the frontend, but the number of core
1142 * options must not change from the number in the initial call.
1143 *
1144 * 'data' points to an array of retro_core_option_definition structs
1145 * terminated by a { NULL, NULL, NULL, {{0}}, NULL } element.
1146 * retro_core_option_definition::key should be namespaced to not collide
1147 * with other implementations' keys. e.g. A core called
1148 * 'foo' should use keys named as 'foo_option'.
1149 * retro_core_option_definition::desc should contain a human readable
1150 * description of the key.
1151 * retro_core_option_definition::info should contain any additional human
1152 * readable information text that a typical user may need to
1153 * understand the functionality of the option.
1154 * retro_core_option_definition::values is an array of retro_core_option_value
1155 * structs terminated by a { NULL, NULL } element.
1156 * > retro_core_option_definition::values[index].value is an expected option
1157 * value.
1158 * > retro_core_option_definition::values[index].label is a human readable
1159 * label used when displaying the value on screen. If NULL,
1160 * the value itself is used.
1161 * retro_core_option_definition::default_value is the default core option
1162 * setting. It must match one of the expected option values in the
1163 * retro_core_option_definition::values array. If it does not, or the
1164 * default value is NULL, the first entry in the
1165 * retro_core_option_definition::values array is treated as the default.
1166 *
1167 * The number of possible options should be very limited,
1168 * and must be less than RETRO_NUM_CORE_OPTION_VALUES_MAX.
1169 * i.e. it should be feasible to cycle through options
1170 * without a keyboard.
1171 *
1172 * Example entry:
1173 * {
1174 * "foo_option",
1175 * "Speed hack coprocessor X",
1176 * "Provides increased performance at the expense of reduced accuracy",
1177 * {
1178 * { "false", NULL },
1179 * { "true", NULL },
1180 * { "unstable", "Turbo (Unstable)" },
1181 * { NULL, NULL },
1182 * },
1183 * "false"
1184 * }
1185 *
1186 * Only strings are operated on. The possible values will
1187 * generally be displayed and stored as-is by the frontend.
1188 */
1189
1190#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_INTL 54
1191 /* const struct retro_core_options_intl * --
1192 * Allows an implementation to signal the environment
1193 * which variables it might want to check for later using
1194 * GET_VARIABLE.
1195 * This allows the frontend to present these variables to
1196 * a user dynamically.
1197 * This should only be called if RETRO_ENVIRONMENT_GET_CORE_OPTIONS_VERSION
1198 * returns an API version of >= 1.
1199 * This should be called instead of RETRO_ENVIRONMENT_SET_VARIABLES.
1200 * This should be called the first time as early as
1201 * possible (ideally in retro_set_environment).
1202 * Afterwards it may be called again for the core to communicate
1203 * updated options to the frontend, but the number of core
1204 * options must not change from the number in the initial call.
1205 *
1206 * This is fundamentally the same as RETRO_ENVIRONMENT_SET_CORE_OPTIONS,
1207 * with the addition of localisation support. The description of the
1208 * RETRO_ENVIRONMENT_SET_CORE_OPTIONS callback should be consulted
1209 * for further details.
1210 *
1211 * 'data' points to a retro_core_options_intl struct.
1212 *
1213 * retro_core_options_intl::us is a pointer to an array of
1214 * retro_core_option_definition structs defining the US English
1215 * core options implementation. It must point to a valid array.
1216 *
1217 * retro_core_options_intl::local is a pointer to an array of
1218 * retro_core_option_definition structs defining core options for
1219 * the current frontend language. It may be NULL (in which case
1220 * retro_core_options_intl::us is used by the frontend). Any items
1221 * missing from this array will be read from retro_core_options_intl::us
1222 * instead.
1223 *
1224 * NOTE: Default core option values are always taken from the
1225 * retro_core_options_intl::us array. Any default values in
1226 * retro_core_options_intl::local array will be ignored.
1227 */
1228
1229#define RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY 55
1230 /* struct retro_core_option_display * --
1231 *
1232 * Allows an implementation to signal the environment to show
1233 * or hide a variable when displaying core options. This is
1234 * considered a *suggestion*. The frontend is free to ignore
1235 * this callback, and its implementation not considered mandatory.
1236 *
1237 * 'data' points to a retro_core_option_display struct
1238 *
1239 * retro_core_option_display::key is a variable identifier
1240 * which has already been set by SET_VARIABLES/SET_CORE_OPTIONS.
1241 *
1242 * retro_core_option_display::visible is a boolean, specifying
1243 * whether variable should be displayed
1244 *
1245 * Note that all core option variables will be set visible by
1246 * default when calling SET_VARIABLES/SET_CORE_OPTIONS.
1247 */
1248
1249/* VFS functionality */
1250
1251/* File paths:
1252 * File paths passed as parameters when using this API shall be well formed UNIX-style,
1253 * using "/" (unquoted forward slash) as directory separator regardless of the platform's native separator.
1254 * Paths shall also include at least one forward slash ("game.bin" is an invalid path, use "./game.bin" instead).
1255 * Other than the directory separator, cores shall not make assumptions about path format:
1256 * "C:/path/game.bin", "http://example.com/game.bin", "#game/game.bin", "./game.bin" (without quotes) are all valid paths.
1257 * Cores may replace the basename or remove path components from the end, and/or add new components;
1258 * however, cores shall not append "./", "../" or multiple consecutive forward slashes ("//") to paths they request to front end.
1259 * 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.
1260 * Frontends are encouraged, but not required, to support native file system paths (modulo replacing the directory separator, if applicable).
1261 * Cores are allowed to try using them, but must remain functional if the front rejects such requests.
1262 * Cores are encouraged to use the libretro-common filestream functions for file I/O,
1263 * as they seamlessly integrate with VFS, deal with directory separator replacement as appropriate
1264 * and provide platform-specific fallbacks in cases where front ends do not support VFS. */
1265
1266/* Opaque file handle
1267 * Introduced in VFS API v1 */
1268struct retro_vfs_file_handle;
1269
1270/* Opaque directory handle
1271 * Introduced in VFS API v3 */
1272struct retro_vfs_dir_handle;
1273
1274/* File open flags
1275 * Introduced in VFS API v1 */
1276#define RETRO_VFS_FILE_ACCESS_READ (1 << 0) /* Read only mode */
1277#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 */
1278#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*/
1279#define RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING (1 << 2) /* Prevents discarding content of existing files opened for writing */
1280
1281/* These are only hints. The frontend may choose to ignore them. Other than RAM/CPU/etc use,
1282 and how they react to unlikely external interference (for example someone else writing to that file,
1283 or the file's server going down), behavior will not change. */
1284#define RETRO_VFS_FILE_ACCESS_HINT_NONE (0)
1285/* Indicate that the file will be accessed many times. The frontend should aggressively cache everything. */
1286#define RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS (1 << 0)
1287
1288/* Seek positions */
1289#define RETRO_VFS_SEEK_POSITION_START 0
1290#define RETRO_VFS_SEEK_POSITION_CURRENT 1
1291#define RETRO_VFS_SEEK_POSITION_END 2
1292
1293/* stat() result flags
1294 * Introduced in VFS API v3 */
1295#define RETRO_VFS_STAT_IS_VALID (1 << 0)
1296#define RETRO_VFS_STAT_IS_DIRECTORY (1 << 1)
1297#define RETRO_VFS_STAT_IS_CHARACTER_SPECIAL (1 << 2)
1298
1299/* Get path from opaque handle. Returns the exact same path passed to file_open when getting the handle
1300 * Introduced in VFS API v1 */
1301typedef const char *(RETRO_CALLCONV *retro_vfs_get_path_t)(struct retro_vfs_file_handle *stream);
1302
1303/* Open a file for reading or writing. If path points to a directory, this will
1304 * fail. Returns the opaque file handle, or NULL for error.
1305 * Introduced in VFS API v1 */
1306typedef struct retro_vfs_file_handle *(RETRO_CALLCONV *retro_vfs_open_t)(const char *path, unsigned mode, unsigned hints);
1307
1308/* Close the file and release its resources. Must be called if open_file returns non-NULL. Returns 0 on success, -1 on failure.
1309 * Whether the call succeeds ot not, the handle passed as parameter becomes invalid and should no longer be used.
1310 * Introduced in VFS API v1 */
1311typedef int (RETRO_CALLCONV *retro_vfs_close_t)(struct retro_vfs_file_handle *stream);
1312
1313/* Return the size of the file in bytes, or -1 for error.
1314 * Introduced in VFS API v1 */
1315typedef int64_t (RETRO_CALLCONV *retro_vfs_size_t)(struct retro_vfs_file_handle *stream);
1316
1317/* Truncate file to specified size. Returns 0 on success or -1 on error
1318 * Introduced in VFS API v2 */
1319typedef int64_t (RETRO_CALLCONV *retro_vfs_truncate_t)(struct retro_vfs_file_handle *stream, int64_t length);
1320
1321/* Get the current read / write position for the file. Returns -1 for error.
1322 * Introduced in VFS API v1 */
1323typedef int64_t (RETRO_CALLCONV *retro_vfs_tell_t)(struct retro_vfs_file_handle *stream);
1324
1325/* Set the current read/write position for the file. Returns the new position, -1 for error.
1326 * Introduced in VFS API v1 */
1327typedef int64_t (RETRO_CALLCONV *retro_vfs_seek_t)(struct retro_vfs_file_handle *stream, int64_t offset, int seek_position);
1328
1329/* Read data from a file. Returns the number of bytes read, or -1 for error.
1330 * Introduced in VFS API v1 */
1331typedef int64_t (RETRO_CALLCONV *retro_vfs_read_t)(struct retro_vfs_file_handle *stream, void *s, uint64_t len);
1332
1333/* Write data to a file. Returns the number of bytes written, or -1 for error.
1334 * Introduced in VFS API v1 */
1335typedef int64_t (RETRO_CALLCONV *retro_vfs_write_t)(struct retro_vfs_file_handle *stream, const void *s, uint64_t len);
1336
1337/* Flush pending writes to file, if using buffered IO. Returns 0 on sucess, or -1 on failure.
1338 * Introduced in VFS API v1 */
1339typedef int (RETRO_CALLCONV *retro_vfs_flush_t)(struct retro_vfs_file_handle *stream);
1340
1341/* Delete the specified file. Returns 0 on success, -1 on failure
1342 * Introduced in VFS API v1 */
1343typedef int (RETRO_CALLCONV *retro_vfs_remove_t)(const char *path);
1344
1345/* Rename the specified file. Returns 0 on success, -1 on failure
1346 * Introduced in VFS API v1 */
1347typedef int (RETRO_CALLCONV *retro_vfs_rename_t)(const char *old_path, const char *new_path);
1348
1349/* Stat the specified file. Retruns a bitmask of RETRO_VFS_STAT_* flags, none are set if path was not valid.
1350 * Additionally stores file size in given variable, unless NULL is given.
1351 * Introduced in VFS API v3 */
1352typedef int (RETRO_CALLCONV *retro_vfs_stat_t)(const char *path, int32_t *size);
1353
1354/* Create the specified directory. Returns 0 on success, -1 on unknown failure, -2 if already exists.
1355 * Introduced in VFS API v3 */
1356typedef int (RETRO_CALLCONV *retro_vfs_mkdir_t)(const char *dir);
1357
1358/* Open the specified directory for listing. Returns the opaque dir handle, or NULL for error.
1359 * Support for the include_hidden argument may vary depending on the platform.
1360 * Introduced in VFS API v3 */
1361typedef struct retro_vfs_dir_handle *(RETRO_CALLCONV *retro_vfs_opendir_t)(const char *dir, bool include_hidden);
1362
1363/* Read the directory entry at the current position, and move the read pointer to the next position.
1364 * Returns true on success, false if already on the last entry.
1365 * Introduced in VFS API v3 */
1366typedef bool (RETRO_CALLCONV *retro_vfs_readdir_t)(struct retro_vfs_dir_handle *dirstream);
1367
1368/* Get the name of the last entry read. Returns a string on success, or NULL for error.
1369 * The returned string pointer is valid until the next call to readdir or closedir.
1370 * Introduced in VFS API v3 */
1371typedef const char *(RETRO_CALLCONV *retro_vfs_dirent_get_name_t)(struct retro_vfs_dir_handle *dirstream);
1372
1373/* Check if the last entry read was a directory. Returns true if it was, false otherwise (or on error).
1374 * Introduced in VFS API v3 */
1375typedef bool (RETRO_CALLCONV *retro_vfs_dirent_is_dir_t)(struct retro_vfs_dir_handle *dirstream);
1376
1377/* Close the directory and release its resources. Must be called if opendir returns non-NULL. Returns 0 on success, -1 on failure.
1378 * Whether the call succeeds ot not, the handle passed as parameter becomes invalid and should no longer be used.
1379 * Introduced in VFS API v3 */
1380typedef int (RETRO_CALLCONV *retro_vfs_closedir_t)(struct retro_vfs_dir_handle *dirstream);
1381
1382struct retro_vfs_interface
1383{
1384 /* VFS API v1 */
1385 retro_vfs_get_path_t get_path;
1386 retro_vfs_open_t open;
1387 retro_vfs_close_t close;
1388 retro_vfs_size_t size;
1389 retro_vfs_tell_t tell;
1390 retro_vfs_seek_t seek;
1391 retro_vfs_read_t read;
1392 retro_vfs_write_t write;
1393 retro_vfs_flush_t flush;
1394 retro_vfs_remove_t remove;
1395 retro_vfs_rename_t rename;
1396 /* VFS API v2 */
1397 retro_vfs_truncate_t truncate;
1398 /* VFS API v3 */
1399 retro_vfs_stat_t stat;
1400 retro_vfs_mkdir_t mkdir;
1401 retro_vfs_opendir_t opendir;
1402 retro_vfs_readdir_t readdir;
1403 retro_vfs_dirent_get_name_t dirent_get_name;
1404 retro_vfs_dirent_is_dir_t dirent_is_dir;
1405 retro_vfs_closedir_t closedir;
1406};
1407
1408struct retro_vfs_interface_info
1409{
1410 /* Set by core: should this be higher than the version the front end supports,
1411 * front end will return false in the RETRO_ENVIRONMENT_GET_VFS_INTERFACE call
1412 * Introduced in VFS API v1 */
1413 uint32_t required_interface_version;
1414
1415 /* Frontend writes interface pointer here. The frontend also sets the actual
1416 * version, must be at least required_interface_version.
1417 * Introduced in VFS API v1 */
1418 struct retro_vfs_interface *iface;
1419};
1420
1421enum retro_hw_render_interface_type
1422{
1423 RETRO_HW_RENDER_INTERFACE_VULKAN = 0,
1424 RETRO_HW_RENDER_INTERFACE_D3D9 = 1,
1425 RETRO_HW_RENDER_INTERFACE_D3D10 = 2,
1426 RETRO_HW_RENDER_INTERFACE_D3D11 = 3,
1427 RETRO_HW_RENDER_INTERFACE_D3D12 = 4,
1428 RETRO_HW_RENDER_INTERFACE_GSKIT_PS2 = 5,
1429 RETRO_HW_RENDER_INTERFACE_DUMMY = INT_MAX
1430};
1431
1432/* Base struct. All retro_hw_render_interface_* types
1433 * contain at least these fields. */
1434struct retro_hw_render_interface
1435{
1436 enum retro_hw_render_interface_type interface_type;
1437 unsigned interface_version;
1438};
1439
1440typedef void (RETRO_CALLCONV *retro_set_led_state_t)(int led, int state);
1441struct retro_led_interface
1442{
1443 retro_set_led_state_t set_led_state;
1444};
1445
1446/* Retrieves the current state of the MIDI input.
1447 * Returns true if it's enabled, false otherwise. */
1448typedef bool (RETRO_CALLCONV *retro_midi_input_enabled_t)(void);
1449
1450/* Retrieves the current state of the MIDI output.
1451 * Returns true if it's enabled, false otherwise */
1452typedef bool (RETRO_CALLCONV *retro_midi_output_enabled_t)(void);
1453
1454/* Reads next byte from the input stream.
1455 * Returns true if byte is read, false otherwise. */
1456typedef bool (RETRO_CALLCONV *retro_midi_read_t)(uint8_t *byte);
1457
1458/* Writes byte to the output stream.
1459 * 'delta_time' is in microseconds and represent time elapsed since previous write.
1460 * Returns true if byte is written, false otherwise. */
1461typedef bool (RETRO_CALLCONV *retro_midi_write_t)(uint8_t byte, uint32_t delta_time);
1462
1463/* Flushes previously written data.
1464 * Returns true if successful, false otherwise. */
1465typedef bool (RETRO_CALLCONV *retro_midi_flush_t)(void);
1466
1467struct retro_midi_interface
1468{
1469 retro_midi_input_enabled_t input_enabled;
1470 retro_midi_output_enabled_t output_enabled;
1471 retro_midi_read_t read;
1472 retro_midi_write_t write;
1473 retro_midi_flush_t flush;
1474};
1475
1476enum retro_hw_render_context_negotiation_interface_type
1477{
1478 RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_VULKAN = 0,
1479 RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_DUMMY = INT_MAX
1480};
1481
1482/* Base struct. All retro_hw_render_context_negotiation_interface_* types
1483 * contain at least these fields. */
1484struct retro_hw_render_context_negotiation_interface
1485{
1486 enum retro_hw_render_context_negotiation_interface_type interface_type;
1487 unsigned interface_version;
1488};
1489
1490/* Serialized state is incomplete in some way. Set if serialization is
1491 * usable in typical end-user cases but should not be relied upon to
1492 * implement frame-sensitive frontend features such as netplay or
1493 * rerecording. */
1494#define RETRO_SERIALIZATION_QUIRK_INCOMPLETE (1 << 0)
1495/* The core must spend some time initializing before serialization is
1496 * supported. retro_serialize() will initially fail; retro_unserialize()
1497 * and retro_serialize_size() may or may not work correctly either. */
1498#define RETRO_SERIALIZATION_QUIRK_MUST_INITIALIZE (1 << 1)
1499/* Serialization size may change within a session. */
1500#define RETRO_SERIALIZATION_QUIRK_CORE_VARIABLE_SIZE (1 << 2)
1501/* Set by the frontend to acknowledge that it supports variable-sized
1502 * states. */
1503#define RETRO_SERIALIZATION_QUIRK_FRONT_VARIABLE_SIZE (1 << 3)
1504/* Serialized state can only be loaded during the same session. */
1505#define RETRO_SERIALIZATION_QUIRK_SINGLE_SESSION (1 << 4)
1506/* Serialized state cannot be loaded on an architecture with a different
1507 * endianness from the one it was saved on. */
1508#define RETRO_SERIALIZATION_QUIRK_ENDIAN_DEPENDENT (1 << 5)
1509/* Serialized state cannot be loaded on a different platform from the one it
1510 * was saved on for reasons other than endianness, such as word size
1511 * dependence */
1512#define RETRO_SERIALIZATION_QUIRK_PLATFORM_DEPENDENT (1 << 6)
1513
1514#define RETRO_MEMDESC_CONST (1 << 0) /* The frontend will never change this memory area once retro_load_game has returned. */
1515#define RETRO_MEMDESC_BIGENDIAN (1 << 1) /* The memory area contains big endian data. Default is little endian. */
1516#define RETRO_MEMDESC_SYSTEM_RAM (1 << 2) /* The memory area is system RAM. This is main RAM of the gaming system. */
1517#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. */
1518#define RETRO_MEMDESC_VIDEO_RAM (1 << 4) /* The memory area is video RAM (VRAM) */
1519#define RETRO_MEMDESC_ALIGN_2 (1 << 16) /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */
1520#define RETRO_MEMDESC_ALIGN_4 (2 << 16)
1521#define RETRO_MEMDESC_ALIGN_8 (3 << 16)
1522#define RETRO_MEMDESC_MINSIZE_2 (1 << 24) /* All memory in this region is accessed at least 2 bytes at the time. */
1523#define RETRO_MEMDESC_MINSIZE_4 (2 << 24)
1524#define RETRO_MEMDESC_MINSIZE_8 (3 << 24)
1525struct retro_memory_descriptor
1526{
1527 uint64_t flags;
1528
1529 /* Pointer to the start of the relevant ROM or RAM chip.
1530 * It's strongly recommended to use 'offset' if possible, rather than
1531 * doing math on the pointer.
1532 *
1533 * If the same byte is mapped my multiple descriptors, their descriptors
1534 * must have the same pointer.
1535 * If 'start' does not point to the first byte in the pointer, put the
1536 * difference in 'offset' instead.
1537 *
1538 * May be NULL if there's nothing usable here (e.g. hardware registers and
1539 * open bus). No flags should be set if the pointer is NULL.
1540 * It's recommended to minimize the number of descriptors if possible,
1541 * but not mandatory. */
1542 void *ptr;
1543 size_t offset;
1544
1545 /* This is the location in the emulated address space
1546 * where the mapping starts. */
1547 size_t start;
1548
1549 /* Which bits must be same as in 'start' for this mapping to apply.
1550 * The first memory descriptor to claim a certain byte is the one
1551 * that applies.
1552 * A bit which is set in 'start' must also be set in this.
1553 * Can be zero, in which case each byte is assumed mapped exactly once.
1554 * In this case, 'len' must be a power of two. */
1555 size_t select;
1556
1557 /* If this is nonzero, the set bits are assumed not connected to the
1558 * memory chip's address pins. */
1559 size_t disconnect;
1560
1561 /* This one tells the size of the current memory area.
1562 * If, after start+disconnect are applied, the address is higher than
1563 * this, the highest bit of the address is cleared.
1564 *
1565 * If the address is still too high, the next highest bit is cleared.
1566 * Can be zero, in which case it's assumed to be infinite (as limited
1567 * by 'select' and 'disconnect'). */
1568 size_t len;
1569
1570 /* To go from emulated address to physical address, the following
1571 * order applies:
1572 * Subtract 'start', pick off 'disconnect', apply 'len', add 'offset'. */
1573
1574 /* The address space name must consist of only a-zA-Z0-9_-,
1575 * should be as short as feasible (maximum length is 8 plus the NUL),
1576 * and may not be any other address space plus one or more 0-9A-F
1577 * at the end.
1578 * However, multiple memory descriptors for the same address space is
1579 * allowed, and the address space name can be empty. NULL is treated
1580 * as empty.
1581 *
1582 * Address space names are case sensitive, but avoid lowercase if possible.
1583 * The same pointer may exist in multiple address spaces.
1584 *
1585 * Examples:
1586 * blank+blank - valid (multiple things may be mapped in the same namespace)
1587 * 'Sp'+'Sp' - valid (multiple things may be mapped in the same namespace)
1588 * 'A'+'B' - valid (neither is a prefix of each other)
1589 * 'S'+blank - valid ('S' is not in 0-9A-F)
1590 * 'a'+blank - valid ('a' is not in 0-9A-F)
1591 * 'a'+'A' - valid (neither is a prefix of each other)
1592 * 'AR'+blank - valid ('R' is not in 0-9A-F)
1593 * 'ARB'+blank - valid (the B can't be part of the address either, because
1594 * there is no namespace 'AR')
1595 * blank+'B' - not valid, because it's ambigous which address space B1234
1596 * would refer to.
1597 * The length can't be used for that purpose; the frontend may want
1598 * to append arbitrary data to an address, without a separator. */
1599 const char *addrspace;
1600
1601 /* TODO: When finalizing this one, add a description field, which should be
1602 * "WRAM" or something roughly equally long. */
1603
1604 /* TODO: When finalizing this one, replace 'select' with 'limit', which tells
1605 * which bits can vary and still refer to the same address (limit = ~select).
1606 * TODO: limit? range? vary? something else? */
1607
1608 /* TODO: When finalizing this one, if 'len' is above what 'select' (or
1609 * 'limit') allows, it's bankswitched. Bankswitched data must have both 'len'
1610 * and 'select' != 0, and the mappings don't tell how the system switches the
1611 * banks. */
1612
1613 /* TODO: When finalizing this one, fix the 'len' bit removal order.
1614 * For len=0x1800, pointer 0x1C00 should go to 0x1400, not 0x0C00.
1615 * Algorithm: Take bits highest to lowest, but if it goes above len, clear
1616 * the most recent addition and continue on the next bit.
1617 * TODO: Can the above be optimized? Is "remove the lowest bit set in both
1618 * pointer and 'len'" equivalent? */
1619
1620 /* TODO: Some emulators (MAME?) emulate big endian systems by only accessing
1621 * the emulated memory in 32-bit chunks, native endian. But that's nothing
1622 * compared to Darek Mihocka <http://www.emulators.com/docs/nx07_vm101.htm>
1623 * (section Emulation 103 - Nearly Free Byte Reversal) - he flips the ENTIRE
1624 * RAM backwards! I'll want to represent both of those, via some flags.
1625 *
1626 * I suspect MAME either didn't think of that idea, or don't want the #ifdef.
1627 * Not sure which, nor do I really care. */
1628
1629 /* TODO: Some of those flags are unused and/or don't really make sense. Clean
1630 * them up. */
1631};
1632
1633/* The frontend may use the largest value of 'start'+'select' in a
1634 * certain namespace to infer the size of the address space.
1635 *
1636 * If the address space is larger than that, a mapping with .ptr=NULL
1637 * should be at the end of the array, with .select set to all ones for
1638 * as long as the address space is big.
1639 *
1640 * Sample descriptors (minus .ptr, and RETRO_MEMFLAG_ on the flags):
1641 * SNES WRAM:
1642 * .start=0x7E0000, .len=0x20000
1643 * (Note that this must be mapped before the ROM in most cases; some of the
1644 * ROM mappers
1645 * try to claim $7E0000, or at least $7E8000.)
1646 * SNES SPC700 RAM:
1647 * .addrspace="S", .len=0x10000
1648 * SNES WRAM mirrors:
1649 * .flags=MIRROR, .start=0x000000, .select=0xC0E000, .len=0x2000
1650 * .flags=MIRROR, .start=0x800000, .select=0xC0E000, .len=0x2000
1651 * SNES WRAM mirrors, alternate equivalent descriptor:
1652 * .flags=MIRROR, .select=0x40E000, .disconnect=~0x1FFF
1653 * (Various similar constructions can be created by combining parts of
1654 * the above two.)
1655 * SNES LoROM (512KB, mirrored a couple of times):
1656 * .flags=CONST, .start=0x008000, .select=0x408000, .disconnect=0x8000, .len=512*1024
1657 * .flags=CONST, .start=0x400000, .select=0x400000, .disconnect=0x8000, .len=512*1024
1658 * SNES HiROM (4MB):
1659 * .flags=CONST, .start=0x400000, .select=0x400000, .len=4*1024*1024
1660 * .flags=CONST, .offset=0x8000, .start=0x008000, .select=0x408000, .len=4*1024*1024
1661 * SNES ExHiROM (8MB):
1662 * .flags=CONST, .offset=0, .start=0xC00000, .select=0xC00000, .len=4*1024*1024
1663 * .flags=CONST, .offset=4*1024*1024, .start=0x400000, .select=0xC00000, .len=4*1024*1024
1664 * .flags=CONST, .offset=0x8000, .start=0x808000, .select=0xC08000, .len=4*1024*1024
1665 * .flags=CONST, .offset=4*1024*1024+0x8000, .start=0x008000, .select=0xC08000, .len=4*1024*1024
1666 * Clarify the size of the address space:
1667 * .ptr=NULL, .select=0xFFFFFF
1668 * .len can be implied by .select in many of them, but was included for clarity.
1669 */
1670
1671struct retro_memory_map
1672{
1673 const struct retro_memory_descriptor *descriptors;
1674 unsigned num_descriptors;
1675};
1676
1677struct retro_controller_description
1678{
1679 /* Human-readable description of the controller. Even if using a generic
1680 * input device type, this can be set to the particular device type the
1681 * core uses. */
1682 const char *desc;
1683
1684 /* Device type passed to retro_set_controller_port_device(). If the device
1685 * type is a sub-class of a generic input device type, use the
1686 * RETRO_DEVICE_SUBCLASS macro to create an ID.
1687 *
1688 * E.g. RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1). */
1689 unsigned id;
1690};
1691
1692struct retro_controller_info
1693{
1694 const struct retro_controller_description *types;
1695 unsigned num_types;
1696};
1697
1698struct retro_subsystem_memory_info
1699{
1700 /* The extension associated with a memory type, e.g. "psram". */
1701 const char *extension;
1702
1703 /* The memory type for retro_get_memory(). This should be at
1704 * least 0x100 to avoid conflict with standardized
1705 * libretro memory types. */
1706 unsigned type;
1707};
1708
1709struct retro_subsystem_rom_info
1710{
1711 /* Describes what the content is (SGB BIOS, GB ROM, etc). */
1712 const char *desc;
1713
1714 /* Same definition as retro_get_system_info(). */
1715 const char *valid_extensions;
1716
1717 /* Same definition as retro_get_system_info(). */
1718 bool need_fullpath;
1719
1720 /* Same definition as retro_get_system_info(). */
1721 bool block_extract;
1722
1723 /* This is set if the content is required to load a game.
1724 * If this is set to false, a zeroed-out retro_game_info can be passed. */
1725 bool required;
1726
1727 /* Content can have multiple associated persistent
1728 * memory types (retro_get_memory()). */
1729 const struct retro_subsystem_memory_info *memory;
1730 unsigned num_memory;
1731};
1732
1733struct retro_subsystem_info
1734{
1735 /* Human-readable string of the subsystem type, e.g. "Super GameBoy" */
1736 const char *desc;
1737
1738 /* A computer friendly short string identifier for the subsystem type.
1739 * This name must be [a-z].
1740 * E.g. if desc is "Super GameBoy", this can be "sgb".
1741 * This identifier can be used for command-line interfaces, etc.
1742 */
1743 const char *ident;
1744
1745 /* Infos for each content file. The first entry is assumed to be the
1746 * "most significant" content for frontend purposes.
1747 * E.g. with Super GameBoy, the first content should be the GameBoy ROM,
1748 * as it is the most "significant" content to a user.
1749 * If a frontend creates new file paths based on the content used
1750 * (e.g. savestates), it should use the path for the first ROM to do so. */
1751 const struct retro_subsystem_rom_info *roms;
1752
1753 /* Number of content files associated with a subsystem. */
1754 unsigned num_roms;
1755
1756 /* The type passed to retro_load_game_special(). */
1757 unsigned id;
1758};
1759
1760typedef void (RETRO_CALLCONV *retro_proc_address_t)(void);
1761
1762/* libretro API extension functions:
1763 * (None here so far).
1764 *
1765 * Get a symbol from a libretro core.
1766 * Cores should only return symbols which are actual
1767 * extensions to the libretro API.
1768 *
1769 * Frontends should not use this to obtain symbols to standard
1770 * libretro entry points (static linking or dlsym).
1771 *
1772 * The symbol name must be equal to the function name,
1773 * e.g. if void retro_foo(void); exists, the symbol must be called "retro_foo".
1774 * The returned function pointer must be cast to the corresponding type.
1775 */
1776typedef retro_proc_address_t (RETRO_CALLCONV *retro_get_proc_address_t)(const char *sym);
1777
1778struct retro_get_proc_address_interface
1779{
1780 retro_get_proc_address_t get_proc_address;
1781};
1782
1783enum retro_log_level
1784{
1785 RETRO_LOG_DEBUG = 0,
1786 RETRO_LOG_INFO,
1787 RETRO_LOG_WARN,
1788 RETRO_LOG_ERROR,
1789
1790 RETRO_LOG_DUMMY = INT_MAX
1791};
1792
1793/* Logging function. Takes log level argument as well. */
1794typedef void (RETRO_CALLCONV *retro_log_printf_t)(enum retro_log_level level,
1795 const char *fmt, ...);
1796
1797struct retro_log_callback
1798{
1799 retro_log_printf_t log;
1800};
1801
1802/* Performance related functions */
1803
1804/* ID values for SIMD CPU features */
1805#define RETRO_SIMD_SSE (1 << 0)
1806#define RETRO_SIMD_SSE2 (1 << 1)
1807#define RETRO_SIMD_VMX (1 << 2)
1808#define RETRO_SIMD_VMX128 (1 << 3)
1809#define RETRO_SIMD_AVX (1 << 4)
1810#define RETRO_SIMD_NEON (1 << 5)
1811#define RETRO_SIMD_SSE3 (1 << 6)
1812#define RETRO_SIMD_SSSE3 (1 << 7)
1813#define RETRO_SIMD_MMX (1 << 8)
1814#define RETRO_SIMD_MMXEXT (1 << 9)
1815#define RETRO_SIMD_SSE4 (1 << 10)
1816#define RETRO_SIMD_SSE42 (1 << 11)
1817#define RETRO_SIMD_AVX2 (1 << 12)
1818#define RETRO_SIMD_VFPU (1 << 13)
1819#define RETRO_SIMD_PS (1 << 14)
1820#define RETRO_SIMD_AES (1 << 15)
1821#define RETRO_SIMD_VFPV3 (1 << 16)
1822#define RETRO_SIMD_VFPV4 (1 << 17)
1823#define RETRO_SIMD_POPCNT (1 << 18)
1824#define RETRO_SIMD_MOVBE (1 << 19)
1825#define RETRO_SIMD_CMOV (1 << 20)
1826#define RETRO_SIMD_ASIMD (1 << 21)
1827
1828typedef uint64_t retro_perf_tick_t;
1829typedef int64_t retro_time_t;
1830
1831struct retro_perf_counter
1832{
1833 const char *ident;
1834 retro_perf_tick_t start;
1835 retro_perf_tick_t total;
1836 retro_perf_tick_t call_cnt;
1837
1838 bool registered;
1839};
1840
1841/* Returns current time in microseconds.
1842 * Tries to use the most accurate timer available.
1843 */
1844typedef retro_time_t (RETRO_CALLCONV *retro_perf_get_time_usec_t)(void);
1845
1846/* A simple counter. Usually nanoseconds, but can also be CPU cycles.
1847 * Can be used directly if desired (when creating a more sophisticated
1848 * performance counter system).
1849 * */
1850typedef retro_perf_tick_t (RETRO_CALLCONV *retro_perf_get_counter_t)(void);
1851
1852/* Returns a bit-mask of detected CPU features (RETRO_SIMD_*). */
1853typedef uint64_t (RETRO_CALLCONV *retro_get_cpu_features_t)(void);
1854
1855/* Asks frontend to log and/or display the state of performance counters.
1856 * Performance counters can always be poked into manually as well.
1857 */
1858typedef void (RETRO_CALLCONV *retro_perf_log_t)(void);
1859
1860/* Register a performance counter.
1861 * ident field must be set with a discrete value and other values in
1862 * retro_perf_counter must be 0.
1863 * Registering can be called multiple times. To avoid calling to
1864 * frontend redundantly, you can check registered field first. */
1865typedef void (RETRO_CALLCONV *retro_perf_register_t)(struct retro_perf_counter *counter);
1866
1867/* Starts a registered counter. */
1868typedef void (RETRO_CALLCONV *retro_perf_start_t)(struct retro_perf_counter *counter);
1869
1870/* Stops a registered counter. */
1871typedef void (RETRO_CALLCONV *retro_perf_stop_t)(struct retro_perf_counter *counter);
1872
1873/* For convenience it can be useful to wrap register, start and stop in macros.
1874 * E.g.:
1875 * #ifdef LOG_PERFORMANCE
1876 * #define RETRO_PERFORMANCE_INIT(perf_cb, name) static struct retro_perf_counter name = {#name}; if (!name.registered) perf_cb.perf_register(&(name))
1877 * #define RETRO_PERFORMANCE_START(perf_cb, name) perf_cb.perf_start(&(name))
1878 * #define RETRO_PERFORMANCE_STOP(perf_cb, name) perf_cb.perf_stop(&(name))
1879 * #else
1880 * ... Blank macros ...
1881 * #endif
1882 *
1883 * These can then be used mid-functions around code snippets.
1884 *
1885 * extern struct retro_perf_callback perf_cb; * Somewhere in the core.
1886 *
1887 * void do_some_heavy_work(void)
1888 * {
1889 * RETRO_PERFORMANCE_INIT(cb, work_1;
1890 * RETRO_PERFORMANCE_START(cb, work_1);
1891 * heavy_work_1();
1892 * RETRO_PERFORMANCE_STOP(cb, work_1);
1893 *
1894 * RETRO_PERFORMANCE_INIT(cb, work_2);
1895 * RETRO_PERFORMANCE_START(cb, work_2);
1896 * heavy_work_2();
1897 * RETRO_PERFORMANCE_STOP(cb, work_2);
1898 * }
1899 *
1900 * void retro_deinit(void)
1901 * {
1902 * perf_cb.perf_log(); * Log all perf counters here for example.
1903 * }
1904 */
1905
1906struct retro_perf_callback
1907{
1908 retro_perf_get_time_usec_t get_time_usec;
1909 retro_get_cpu_features_t get_cpu_features;
1910
1911 retro_perf_get_counter_t get_perf_counter;
1912 retro_perf_register_t perf_register;
1913 retro_perf_start_t perf_start;
1914 retro_perf_stop_t perf_stop;
1915 retro_perf_log_t perf_log;
1916};
1917
1918/* FIXME: Document the sensor API and work out behavior.
1919 * It will be marked as experimental until then.
1920 */
1921enum retro_sensor_action
1922{
1923 RETRO_SENSOR_ACCELEROMETER_ENABLE = 0,
1924 RETRO_SENSOR_ACCELEROMETER_DISABLE,
1925
1926 RETRO_SENSOR_DUMMY = INT_MAX
1927};
1928
1929/* Id values for SENSOR types. */
1930#define RETRO_SENSOR_ACCELEROMETER_X 0
1931#define RETRO_SENSOR_ACCELEROMETER_Y 1
1932#define RETRO_SENSOR_ACCELEROMETER_Z 2
1933
1934typedef bool (RETRO_CALLCONV *retro_set_sensor_state_t)(unsigned port,
1935 enum retro_sensor_action action, unsigned rate);
1936
1937typedef float (RETRO_CALLCONV *retro_sensor_get_input_t)(unsigned port, unsigned id);
1938
1939struct retro_sensor_interface
1940{
1941 retro_set_sensor_state_t set_sensor_state;
1942 retro_sensor_get_input_t get_sensor_input;
1943};
1944
1945enum retro_camera_buffer
1946{
1947 RETRO_CAMERA_BUFFER_OPENGL_TEXTURE = 0,
1948 RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER,
1949
1950 RETRO_CAMERA_BUFFER_DUMMY = INT_MAX
1951};
1952
1953/* Starts the camera driver. Can only be called in retro_run(). */
1954typedef bool (RETRO_CALLCONV *retro_camera_start_t)(void);
1955
1956/* Stops the camera driver. Can only be called in retro_run(). */
1957typedef void (RETRO_CALLCONV *retro_camera_stop_t)(void);
1958
1959/* Callback which signals when the camera driver is initialized
1960 * and/or deinitialized.
1961 * retro_camera_start_t can be called in initialized callback.
1962 */
1963typedef void (RETRO_CALLCONV *retro_camera_lifetime_status_t)(void);
1964
1965/* A callback for raw framebuffer data. buffer points to an XRGB8888 buffer.
1966 * Width, height and pitch are similar to retro_video_refresh_t.
1967 * First pixel is top-left origin.
1968 */
1969typedef void (RETRO_CALLCONV *retro_camera_frame_raw_framebuffer_t)(const uint32_t *buffer,
1970 unsigned width, unsigned height, size_t pitch);
1971
1972/* A callback for when OpenGL textures are used.
1973 *
1974 * texture_id is a texture owned by camera driver.
1975 * Its state or content should be considered immutable, except for things like
1976 * texture filtering and clamping.
1977 *
1978 * texture_target is the texture target for the GL texture.
1979 * These can include e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE, and possibly
1980 * more depending on extensions.
1981 *
1982 * affine points to a packed 3x3 column-major matrix used to apply an affine
1983 * transform to texture coordinates. (affine_matrix * vec3(coord_x, coord_y, 1.0))
1984 * After transform, normalized texture coord (0, 0) should be bottom-left
1985 * and (1, 1) should be top-right (or (width, height) for RECTANGLE).
1986 *
1987 * GL-specific typedefs are avoided here to avoid relying on gl.h in
1988 * the API definition.
1989 */
1990typedef void (RETRO_CALLCONV *retro_camera_frame_opengl_texture_t)(unsigned texture_id,
1991 unsigned texture_target, const float *affine);
1992
1993struct retro_camera_callback
1994{
1995 /* Set by libretro core.
1996 * Example bitmask: caps = (1 << RETRO_CAMERA_BUFFER_OPENGL_TEXTURE) | (1 << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER).
1997 */
1998 uint64_t caps;
1999
2000 /* Desired resolution for camera. Is only used as a hint. */
2001 unsigned width;
2002 unsigned height;
2003
2004 /* Set by frontend. */
2005 retro_camera_start_t start;
2006 retro_camera_stop_t stop;
2007
2008 /* Set by libretro core if raw framebuffer callbacks will be used. */
2009 retro_camera_frame_raw_framebuffer_t frame_raw_framebuffer;
2010
2011 /* Set by libretro core if OpenGL texture callbacks will be used. */
2012 retro_camera_frame_opengl_texture_t frame_opengl_texture;
2013
2014 /* Set by libretro core. Called after camera driver is initialized and
2015 * ready to be started.
2016 * Can be NULL, in which this callback is not called.
2017 */
2018 retro_camera_lifetime_status_t initialized;
2019
2020 /* Set by libretro core. Called right before camera driver is
2021 * deinitialized.
2022 * Can be NULL, in which this callback is not called.
2023 */
2024 retro_camera_lifetime_status_t deinitialized;
2025};
2026
2027/* Sets the interval of time and/or distance at which to update/poll
2028 * location-based data.
2029 *
2030 * To ensure compatibility with all location-based implementations,
2031 * values for both interval_ms and interval_distance should be provided.
2032 *
2033 * interval_ms is the interval expressed in milliseconds.
2034 * interval_distance is the distance interval expressed in meters.
2035 */
2036typedef void (RETRO_CALLCONV *retro_location_set_interval_t)(unsigned interval_ms,
2037 unsigned interval_distance);
2038
2039/* Start location services. The device will start listening for changes to the
2040 * current location at regular intervals (which are defined with
2041 * retro_location_set_interval_t). */
2042typedef bool (RETRO_CALLCONV *retro_location_start_t)(void);
2043
2044/* Stop location services. The device will stop listening for changes
2045 * to the current location. */
2046typedef void (RETRO_CALLCONV *retro_location_stop_t)(void);
2047
2048/* Get the position of the current location. Will set parameters to
2049 * 0 if no new location update has happened since the last time. */
2050typedef bool (RETRO_CALLCONV *retro_location_get_position_t)(double *lat, double *lon,
2051 double *horiz_accuracy, double *vert_accuracy);
2052
2053/* Callback which signals when the location driver is initialized
2054 * and/or deinitialized.
2055 * retro_location_start_t can be called in initialized callback.
2056 */
2057typedef void (RETRO_CALLCONV *retro_location_lifetime_status_t)(void);
2058
2059struct retro_location_callback
2060{
2061 retro_location_start_t start;
2062 retro_location_stop_t stop;
2063 retro_location_get_position_t get_position;
2064 retro_location_set_interval_t set_interval;
2065
2066 retro_location_lifetime_status_t initialized;
2067 retro_location_lifetime_status_t deinitialized;
2068};
2069
2070enum retro_rumble_effect
2071{
2072 RETRO_RUMBLE_STRONG = 0,
2073 RETRO_RUMBLE_WEAK = 1,
2074
2075 RETRO_RUMBLE_DUMMY = INT_MAX
2076};
2077
2078/* Sets rumble state for joypad plugged in port 'port'.
2079 * Rumble effects are controlled independently,
2080 * and setting e.g. strong rumble does not override weak rumble.
2081 * Strength has a range of [0, 0xffff].
2082 *
2083 * Returns true if rumble state request was honored.
2084 * Calling this before first retro_run() is likely to return false. */
2085typedef bool (RETRO_CALLCONV *retro_set_rumble_state_t)(unsigned port,
2086 enum retro_rumble_effect effect, uint16_t strength);
2087
2088struct retro_rumble_interface
2089{
2090 retro_set_rumble_state_t set_rumble_state;
2091};
2092
2093/* Notifies libretro that audio data should be written. */
2094typedef void (RETRO_CALLCONV *retro_audio_callback_t)(void);
2095
2096/* True: Audio driver in frontend is active, and callback is
2097 * expected to be called regularily.
2098 * False: Audio driver in frontend is paused or inactive.
2099 * Audio callback will not be called until set_state has been
2100 * called with true.
2101 * Initial state is false (inactive).
2102 */
2103typedef void (RETRO_CALLCONV *retro_audio_set_state_callback_t)(bool enabled);
2104
2105struct retro_audio_callback
2106{
2107 retro_audio_callback_t callback;
2108 retro_audio_set_state_callback_t set_state;
2109};
2110
2111/* Notifies a libretro core of time spent since last invocation
2112 * of retro_run() in microseconds.
2113 *
2114 * It will be called right before retro_run() every frame.
2115 * The frontend can tamper with timing to support cases like
2116 * fast-forward, slow-motion and framestepping.
2117 *
2118 * In those scenarios the reference frame time value will be used. */
2119typedef int64_t retro_usec_t;
2120typedef void (RETRO_CALLCONV *retro_frame_time_callback_t)(retro_usec_t usec);
2121struct retro_frame_time_callback
2122{
2123 retro_frame_time_callback_t callback;
2124 /* Represents the time of one frame. It is computed as
2125 * 1000000 / fps, but the implementation will resolve the
2126 * rounding to ensure that framestepping, etc is exact. */
2127 retro_usec_t reference;
2128};
2129
2130/* Pass this to retro_video_refresh_t if rendering to hardware.
2131 * Passing NULL to retro_video_refresh_t is still a frame dupe as normal.
2132 * */
2133#define RETRO_HW_FRAME_BUFFER_VALID ((void*)-1)
2134
2135/* Invalidates the current HW context.
2136 * Any GL state is lost, and must not be deinitialized explicitly.
2137 * If explicit deinitialization is desired by the libretro core,
2138 * it should implement context_destroy callback.
2139 * If called, all GPU resources must be reinitialized.
2140 * Usually called when frontend reinits video driver.
2141 * Also called first time video driver is initialized,
2142 * allowing libretro core to initialize resources.
2143 */
2144typedef void (RETRO_CALLCONV *retro_hw_context_reset_t)(void);
2145
2146/* Gets current framebuffer which is to be rendered to.
2147 * Could change every frame potentially.
2148 */
2149typedef uintptr_t (RETRO_CALLCONV *retro_hw_get_current_framebuffer_t)(void);
2150
2151/* Get a symbol from HW context. */
2152typedef retro_proc_address_t (RETRO_CALLCONV *retro_hw_get_proc_address_t)(const char *sym);
2153
2154enum retro_hw_context_type
2155{
2156 RETRO_HW_CONTEXT_NONE = 0,
2157 /* OpenGL 2.x. Driver can choose to use latest compatibility context. */
2158 RETRO_HW_CONTEXT_OPENGL = 1,
2159 /* OpenGL ES 2.0. */
2160 RETRO_HW_CONTEXT_OPENGLES2 = 2,
2161 /* Modern desktop core GL context. Use version_major/
2162 * version_minor fields to set GL version. */
2163 RETRO_HW_CONTEXT_OPENGL_CORE = 3,
2164 /* OpenGL ES 3.0 */
2165 RETRO_HW_CONTEXT_OPENGLES3 = 4,
2166 /* OpenGL ES 3.1+. Set version_major/version_minor. For GLES2 and GLES3,
2167 * use the corresponding enums directly. */
2168 RETRO_HW_CONTEXT_OPENGLES_VERSION = 5,
2169
2170 /* Vulkan, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE. */
2171 RETRO_HW_CONTEXT_VULKAN = 6,
2172
2173 /* Direct3D, set version_major to select the type of interface
2174 * returned by RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE */
2175 RETRO_HW_CONTEXT_DIRECT3D = 7,
2176
2177 RETRO_HW_CONTEXT_DUMMY = INT_MAX
2178};
2179
2180struct retro_hw_render_callback
2181{
2182 /* Which API to use. Set by libretro core. */
2183 enum retro_hw_context_type context_type;
2184
2185 /* Called when a context has been created or when it has been reset.
2186 * An OpenGL context is only valid after context_reset() has been called.
2187 *
2188 * When context_reset is called, OpenGL resources in the libretro
2189 * implementation are guaranteed to be invalid.
2190 *
2191 * It is possible that context_reset is called multiple times during an
2192 * application lifecycle.
2193 * If context_reset is called without any notification (context_destroy),
2194 * the OpenGL context was lost and resources should just be recreated
2195 * without any attempt to "free" old resources.
2196 */
2197 retro_hw_context_reset_t context_reset;
2198
2199 /* Set by frontend.
2200 * TODO: This is rather obsolete. The frontend should not
2201 * be providing preallocated framebuffers. */
2202 retro_hw_get_current_framebuffer_t get_current_framebuffer;
2203
2204 /* Set by frontend.
2205 * Can return all relevant functions, including glClear on Windows. */
2206 retro_hw_get_proc_address_t get_proc_address;
2207
2208 /* Set if render buffers should have depth component attached.
2209 * TODO: Obsolete. */
2210 bool depth;
2211
2212 /* Set if stencil buffers should be attached.
2213 * TODO: Obsolete. */
2214 bool stencil;
2215
2216 /* If depth and stencil are true, a packed 24/8 buffer will be added.
2217 * Only attaching stencil is invalid and will be ignored. */
2218
2219 /* Use conventional bottom-left origin convention. If false,
2220 * standard libretro top-left origin semantics are used.
2221 * TODO: Move to GL specific interface. */
2222 bool bottom_left_origin;
2223
2224 /* Major version number for core GL context or GLES 3.1+. */
2225 unsigned version_major;
2226
2227 /* Minor version number for core GL context or GLES 3.1+. */
2228 unsigned version_minor;
2229
2230 /* If this is true, the frontend will go very far to avoid
2231 * resetting context in scenarios like toggling fullscreen, etc.
2232 * TODO: Obsolete? Maybe frontend should just always assume this ...
2233 */
2234 bool cache_context;
2235
2236 /* The reset callback might still be called in extreme situations
2237 * such as if the context is lost beyond recovery.
2238 *
2239 * For optimal stability, set this to false, and allow context to be
2240 * reset at any time.
2241 */
2242
2243 /* A callback to be called before the context is destroyed in a
2244 * controlled way by the frontend. */
2245 retro_hw_context_reset_t context_destroy;
2246
2247 /* OpenGL resources can be deinitialized cleanly at this step.
2248 * context_destroy can be set to NULL, in which resources will
2249 * just be destroyed without any notification.
2250 *
2251 * Even when context_destroy is non-NULL, it is possible that
2252 * context_reset is called without any destroy notification.
2253 * This happens if context is lost by external factors (such as
2254 * notified by GL_ARB_robustness).
2255 *
2256 * In this case, the context is assumed to be already dead,
2257 * and the libretro implementation must not try to free any OpenGL
2258 * resources in the subsequent context_reset.
2259 */
2260
2261 /* Creates a debug context. */
2262 bool debug_context;
2263};
2264
2265/* Callback type passed in RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK.
2266 * Called by the frontend in response to keyboard events.
2267 * down is set if the key is being pressed, or false if it is being released.
2268 * keycode is the RETROK value of the char.
2269 * character is the text character of the pressed key. (UTF-32).
2270 * key_modifiers is a set of RETROKMOD values or'ed together.
2271 *
2272 * The pressed/keycode state can be indepedent of the character.
2273 * It is also possible that multiple characters are generated from a
2274 * single keypress.
2275 * Keycode events should be treated separately from character events.
2276 * However, when possible, the frontend should try to synchronize these.
2277 * If only a character is posted, keycode should be RETROK_UNKNOWN.
2278 *
2279 * Similarily if only a keycode event is generated with no corresponding
2280 * character, character should be 0.
2281 */
2282typedef void (RETRO_CALLCONV *retro_keyboard_event_t)(bool down, unsigned keycode,
2283 uint32_t character, uint16_t key_modifiers);
2284
2285struct retro_keyboard_callback
2286{
2287 retro_keyboard_event_t callback;
2288};
2289
2290/* Callbacks for RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE.
2291 * Should be set for implementations which can swap out multiple disk
2292 * images in runtime.
2293 *
2294 * If the implementation can do this automatically, it should strive to do so.
2295 * However, there are cases where the user must manually do so.
2296 *
2297 * Overview: To swap a disk image, eject the disk image with
2298 * set_eject_state(true).
2299 * Set the disk index with set_image_index(index). Insert the disk again
2300 * with set_eject_state(false).
2301 */
2302
2303/* If ejected is true, "ejects" the virtual disk tray.
2304 * When ejected, the disk image index can be set.
2305 */
2306typedef bool (RETRO_CALLCONV *retro_set_eject_state_t)(bool ejected);
2307
2308/* Gets current eject state. The initial state is 'not ejected'. */
2309typedef bool (RETRO_CALLCONV *retro_get_eject_state_t)(void);
2310
2311/* Gets current disk index. First disk is index 0.
2312 * If return value is >= get_num_images(), no disk is currently inserted.
2313 */
2314typedef unsigned (RETRO_CALLCONV *retro_get_image_index_t)(void);
2315
2316/* Sets image index. Can only be called when disk is ejected.
2317 * The implementation supports setting "no disk" by using an
2318 * index >= get_num_images().
2319 */
2320typedef bool (RETRO_CALLCONV *retro_set_image_index_t)(unsigned index);
2321
2322/* Gets total number of images which are available to use. */
2323typedef unsigned (RETRO_CALLCONV *retro_get_num_images_t)(void);
2324
2325struct retro_game_info;
2326
2327/* Replaces the disk image associated with index.
2328 * Arguments to pass in info have same requirements as retro_load_game().
2329 * Virtual disk tray must be ejected when calling this.
2330 *
2331 * Replacing a disk image with info = NULL will remove the disk image
2332 * from the internal list.
2333 * As a result, calls to get_image_index() can change.
2334 *
2335 * E.g. replace_image_index(1, NULL), and previous get_image_index()
2336 * returned 4 before.
2337 * Index 1 will be removed, and the new index is 3.
2338 */
2339typedef bool (RETRO_CALLCONV *retro_replace_image_index_t)(unsigned index,
2340 const struct retro_game_info *info);
2341
2342/* Adds a new valid index (get_num_images()) to the internal disk list.
2343 * This will increment subsequent return values from get_num_images() by 1.
2344 * This image index cannot be used until a disk image has been set
2345 * with replace_image_index. */
2346typedef bool (RETRO_CALLCONV *retro_add_image_index_t)(void);
2347
2348struct retro_disk_control_callback
2349{
2350 retro_set_eject_state_t set_eject_state;
2351 retro_get_eject_state_t get_eject_state;
2352
2353 retro_get_image_index_t get_image_index;
2354 retro_set_image_index_t set_image_index;
2355 retro_get_num_images_t get_num_images;
2356
2357 retro_replace_image_index_t replace_image_index;
2358 retro_add_image_index_t add_image_index;
2359};
2360
2361enum retro_pixel_format
2362{
2363 /* 0RGB1555, native endian.
2364 * 0 bit must be set to 0.
2365 * This pixel format is default for compatibility concerns only.
2366 * If a 15/16-bit pixel format is desired, consider using RGB565. */
2367 RETRO_PIXEL_FORMAT_0RGB1555 = 0,
2368
2369 /* XRGB8888, native endian.
2370 * X bits are ignored. */
2371 RETRO_PIXEL_FORMAT_XRGB8888 = 1,
2372
2373 /* RGB565, native endian.
2374 * This pixel format is the recommended format to use if a 15/16-bit
2375 * format is desired as it is the pixel format that is typically
2376 * available on a wide range of low-power devices.
2377 *
2378 * It is also natively supported in APIs like OpenGL ES. */
2379 RETRO_PIXEL_FORMAT_RGB565 = 2,
2380
2381 /* Ensure sizeof() == sizeof(int). */
2382 RETRO_PIXEL_FORMAT_UNKNOWN = INT_MAX
2383};
2384
2385struct retro_message
2386{
2387 const char *msg; /* Message to be displayed. */
2388 unsigned frames; /* Duration in frames of message. */
2389};
2390
2391/* Describes how the libretro implementation maps a libretro input bind
2392 * to its internal input system through a human readable string.
2393 * This string can be used to better let a user configure input. */
2394struct retro_input_descriptor
2395{
2396 /* Associates given parameters with a description. */
2397 unsigned port;
2398 unsigned device;
2399 unsigned index;
2400 unsigned id;
2401
2402 /* Human readable description for parameters.
2403 * The pointer must remain valid until
2404 * retro_unload_game() is called. */
2405 const char *description;
2406};
2407
2408struct retro_system_info
2409{
2410 /* All pointers are owned by libretro implementation, and pointers must
2411 * remain valid until retro_deinit() is called. */
2412
2413 const char *library_name; /* Descriptive name of library. Should not
2414 * contain any version numbers, etc. */
2415 const char *library_version; /* Descriptive version of core. */
2416
2417 const char *valid_extensions; /* A string listing probably content
2418 * extensions the core will be able to
2419 * load, separated with pipe.
2420 * I.e. "bin|rom|iso".
2421 * Typically used for a GUI to filter
2422 * out extensions. */
2423
2424 /* Libretro cores that need to have direct access to their content
2425 * files, including cores which use the path of the content files to
2426 * determine the paths of other files, should set need_fullpath to true.
2427 *
2428 * Cores should strive for setting need_fullpath to false,
2429 * as it allows the frontend to perform patching, etc.
2430 *
2431 * If need_fullpath is true and retro_load_game() is called:
2432 * - retro_game_info::path is guaranteed to have a valid path
2433 * - retro_game_info::data and retro_game_info::size are invalid
2434 *
2435 * If need_fullpath is false and retro_load_game() is called:
2436 * - retro_game_info::path may be NULL
2437 * - retro_game_info::data and retro_game_info::size are guaranteed
2438 * to be valid
2439 *
2440 * See also:
2441 * - RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY
2442 * - RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY
2443 */
2444 bool need_fullpath;
2445
2446 /* If true, the frontend is not allowed to extract any archives before
2447 * loading the real content.
2448 * Necessary for certain libretro implementations that load games
2449 * from zipped archives. */
2450 bool block_extract;
2451};
2452
2453struct retro_game_geometry
2454{
2455 unsigned base_width; /* Nominal video width of game. */
2456 unsigned base_height; /* Nominal video height of game. */
2457 unsigned max_width; /* Maximum possible width of game. */
2458 unsigned max_height; /* Maximum possible height of game. */
2459
2460 float aspect_ratio; /* Nominal aspect ratio of game. If
2461 * aspect_ratio is <= 0.0, an aspect ratio
2462 * of base_width / base_height is assumed.
2463 * A frontend could override this setting,
2464 * if desired. */
2465};
2466
2467struct retro_system_timing
2468{
2469 double fps; /* FPS of video content. */
2470 double sample_rate; /* Sampling rate of audio. */
2471};
2472
2473struct retro_system_av_info
2474{
2475 struct retro_game_geometry geometry;
2476 struct retro_system_timing timing;
2477};
2478
2479struct retro_variable
2480{
2481 /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE.
2482 * If NULL, obtains the complete environment string if more
2483 * complex parsing is necessary.
2484 * The environment string is formatted as key-value pairs
2485 * delimited by semicolons as so:
2486 * "key1=value1;key2=value2;..."
2487 */
2488 const char *key;
2489
2490 /* Value to be obtained. If key does not exist, it is set to NULL. */
2491 const char *value;
2492};
2493
2494struct retro_core_option_display
2495{
2496 /* Variable to configure in RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY */
2497 const char *key;
2498
2499 /* Specifies whether variable should be displayed
2500 * when presenting core options to the user */
2501 bool visible;
2502};
2503
2504/* Maximum number of values permitted for a core option
2505 * > Note: We have to set a maximum value due the limitations
2506 * of the C language - i.e. it is not possible to create an
2507 * array of structs each containing a variable sized array,
2508 * so the retro_core_option_definition values array must
2509 * have a fixed size. The size limit of 128 is a balancing
2510 * act - it needs to be large enough to support all 'sane'
2511 * core options, but setting it too large may impact low memory
2512 * platforms. In practise, if a core option has more than
2513 * 128 values then the implementation is likely flawed.
2514 * To quote the above API reference:
2515 * "The number of possible options should be very limited
2516 * i.e. it should be feasible to cycle through options
2517 * without a keyboard."
2518 */
2519#define RETRO_NUM_CORE_OPTION_VALUES_MAX 128
2520
2521struct retro_core_option_value
2522{
2523 /* Expected option value */
2524 const char *value;
2525
2526 /* Human-readable value label. If NULL, value itself
2527 * will be displayed by the frontend */
2528 const char *label;
2529};
2530
2531struct retro_core_option_definition
2532{
2533 /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE. */
2534 const char *key;
2535
2536 /* Human-readable core option description (used as menu label) */
2537 const char *desc;
2538
2539 /* Human-readable core option information (used as menu sublabel) */
2540 const char *info;
2541
2542 /* Array of retro_core_option_value structs, terminated by NULL */
2543 struct retro_core_option_value values[RETRO_NUM_CORE_OPTION_VALUES_MAX];
2544
2545 /* Default core option value. Must match one of the values
2546 * in the retro_core_option_value array, otherwise will be
2547 * ignored */
2548 const char *default_value;
2549};
2550
2551struct retro_core_options_intl
2552{
2553 /* Pointer to an array of retro_core_option_definition structs
2554 * - US English implementation
2555 * - Must point to a valid array */
2556 struct retro_core_option_definition *us;
2557
2558 /* Pointer to an array of retro_core_option_definition structs
2559 * - Implementation for current frontend language
2560 * - May be NULL */
2561 struct retro_core_option_definition *local;
2562};
2563
2564struct retro_game_info
2565{
2566 const char *path; /* Path to game, UTF-8 encoded.
2567 * Sometimes used as a reference for building other paths.
2568 * May be NULL if game was loaded from stdin or similar,
2569 * but in this case some cores will be unable to load `data`.
2570 * So, it is preferable to fabricate something here instead
2571 * of passing NULL, which will help more cores to succeed.
2572 * retro_system_info::need_fullpath requires
2573 * that this path is valid. */
2574 const void *data; /* Memory buffer of loaded game. Will be NULL
2575 * if need_fullpath was set. */
2576 size_t size; /* Size of memory buffer. */
2577 const char *meta; /* String of implementation specific meta-data. */
2578};
2579
2580#define RETRO_MEMORY_ACCESS_WRITE (1 << 0)
2581 /* The core will write to the buffer provided by retro_framebuffer::data. */
2582#define RETRO_MEMORY_ACCESS_READ (1 << 1)
2583 /* The core will read from retro_framebuffer::data. */
2584#define RETRO_MEMORY_TYPE_CACHED (1 << 0)
2585 /* The memory in data is cached.
2586 * If not cached, random writes and/or reading from the buffer is expected to be very slow. */
2587struct retro_framebuffer
2588{
2589 void *data; /* The framebuffer which the core can render into.
2590 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER.
2591 The initial contents of data are unspecified. */
2592 unsigned width; /* The framebuffer width used by the core. Set by core. */
2593 unsigned height; /* The framebuffer height used by the core. Set by core. */
2594 size_t pitch; /* The number of bytes between the beginning of a scanline,
2595 and beginning of the next scanline.
2596 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
2597 enum retro_pixel_format format; /* The pixel format the core must use to render into data.
2598 This format could differ from the format used in
2599 SET_PIXEL_FORMAT.
2600 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
2601
2602 unsigned access_flags; /* How the core will access the memory in the framebuffer.
2603 RETRO_MEMORY_ACCESS_* flags.
2604 Set by core. */
2605 unsigned memory_flags; /* Flags telling core how the memory has been mapped.
2606 RETRO_MEMORY_TYPE_* flags.
2607 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
2608};
2609
2610/* Callbacks */
2611
2612/* Environment callback. Gives implementations a way of performing
2613 * uncommon tasks. Extensible. */
2614typedef bool (RETRO_CALLCONV *retro_environment_t)(unsigned cmd, void *data);
2615
2616/* Render a frame. Pixel format is 15-bit 0RGB1555 native endian
2617 * unless changed (see RETRO_ENVIRONMENT_SET_PIXEL_FORMAT).
2618 *
2619 * Width and height specify dimensions of buffer.
2620 * Pitch specifices length in bytes between two lines in buffer.
2621 *
2622 * For performance reasons, it is highly recommended to have a frame
2623 * that is packed in memory, i.e. pitch == width * byte_per_pixel.
2624 * Certain graphic APIs, such as OpenGL ES, do not like textures
2625 * that are not packed in memory.
2626 */
2627typedef void (RETRO_CALLCONV *retro_video_refresh_t)(const void *data, unsigned width,
2628 unsigned height, size_t pitch);
2629
2630/* Renders a single audio frame. Should only be used if implementation
2631 * generates a single sample at a time.
2632 * Format is signed 16-bit native endian.
2633 */
2634typedef void (RETRO_CALLCONV *retro_audio_sample_t)(int16_t left, int16_t right);
2635
2636/* Renders multiple audio frames in one go.
2637 *
2638 * One frame is defined as a sample of left and right channels, interleaved.
2639 * I.e. int16_t buf[4] = { l, r, l, r }; would be 2 frames.
2640 * Only one of the audio callbacks must ever be used.
2641 */
2642typedef size_t (RETRO_CALLCONV *retro_audio_sample_batch_t)(const int16_t *data,
2643 size_t frames);
2644
2645/* Polls input. */
2646typedef void (RETRO_CALLCONV *retro_input_poll_t)(void);
2647
2648/* Queries for input for player 'port'. device will be masked with
2649 * RETRO_DEVICE_MASK.
2650 *
2651 * Specialization of devices such as RETRO_DEVICE_JOYPAD_MULTITAP that
2652 * have been set with retro_set_controller_port_device()
2653 * will still use the higher level RETRO_DEVICE_JOYPAD to request input.
2654 */
2655typedef int16_t (RETRO_CALLCONV *retro_input_state_t)(unsigned port, unsigned device,
2656 unsigned index, unsigned id);
2657
2658/* Sets callbacks. retro_set_environment() is guaranteed to be called
2659 * before retro_init().
2660 *
2661 * The rest of the set_* functions are guaranteed to have been called
2662 * before the first call to retro_run() is made. */
2663RETRO_API void retro_set_environment(retro_environment_t);
2664RETRO_API void retro_set_video_refresh(retro_video_refresh_t);
2665RETRO_API void retro_set_audio_sample(retro_audio_sample_t);
2666RETRO_API void retro_set_audio_sample_batch(retro_audio_sample_batch_t);
2667RETRO_API void retro_set_input_poll(retro_input_poll_t);
2668RETRO_API void retro_set_input_state(retro_input_state_t);
2669
2670/* Library global initialization/deinitialization. */
2671RETRO_API void retro_init(void);
2672RETRO_API void retro_deinit(void);
2673
2674/* Must return RETRO_API_VERSION. Used to validate ABI compatibility
2675 * when the API is revised. */
2676RETRO_API unsigned retro_api_version(void);
2677
2678/* Gets statically known system info. Pointers provided in *info
2679 * must be statically allocated.
2680 * Can be called at any time, even before retro_init(). */
2681RETRO_API void retro_get_system_info(struct retro_system_info *info);
2682
2683/* Gets information about system audio/video timings and geometry.
2684 * Can be called only after retro_load_game() has successfully completed.
2685 * NOTE: The implementation of this function might not initialize every
2686 * variable if needed.
2687 * E.g. geom.aspect_ratio might not be initialized if core doesn't
2688 * desire a particular aspect ratio. */
2689RETRO_API void retro_get_system_av_info(struct retro_system_av_info *info);
2690
2691/* Sets device to be used for player 'port'.
2692 * By default, RETRO_DEVICE_JOYPAD is assumed to be plugged into all
2693 * available ports.
2694 * Setting a particular device type is not a guarantee that libretro cores
2695 * will only poll input based on that particular device type. It is only a
2696 * hint to the libretro core when a core cannot automatically detect the
2697 * appropriate input device type on its own. It is also relevant when a
2698 * core can change its behavior depending on device type.
2699 *
2700 * As part of the core's implementation of retro_set_controller_port_device,
2701 * the core should call RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS to notify the
2702 * frontend if the descriptions for any controls have changed as a
2703 * result of changing the device type.
2704 */
2705RETRO_API void retro_set_controller_port_device(unsigned port, unsigned device);
2706
2707/* Resets the current game. */
2708RETRO_API void retro_reset(void);
2709
2710/* Runs the game for one video frame.
2711 * During retro_run(), input_poll callback must be called at least once.
2712 *
2713 * If a frame is not rendered for reasons where a game "dropped" a frame,
2714 * this still counts as a frame, and retro_run() should explicitly dupe
2715 * a frame if GET_CAN_DUPE returns true.
2716 * In this case, the video callback can take a NULL argument for data.
2717 */
2718RETRO_API void retro_run(void);
2719
2720/* Returns the amount of data the implementation requires to serialize
2721 * internal state (save states).
2722 * Between calls to retro_load_game() and retro_unload_game(), the
2723 * returned size is never allowed to be larger than a previous returned
2724 * value, to ensure that the frontend can allocate a save state buffer once.
2725 */
2726RETRO_API size_t retro_serialize_size(void);
2727
2728/* Serializes internal state. If failed, or size is lower than
2729 * retro_serialize_size(), it should return false, true otherwise. */
2730RETRO_API bool retro_serialize(void *data, size_t size);
2731RETRO_API bool retro_unserialize(const void *data, size_t size);
2732
2733RETRO_API void retro_cheat_reset(void);
2734RETRO_API void retro_cheat_set(unsigned index, bool enabled, const char *code);
2735
2736/* Loads a game.
2737 * Return true to indicate successful loading and false to indicate load failure.
2738 */
2739RETRO_API bool retro_load_game(const struct retro_game_info *game);
2740
2741/* Loads a "special" kind of game. Should not be used,
2742 * except in extreme cases. */
2743RETRO_API bool retro_load_game_special(
2744 unsigned game_type,
2745 const struct retro_game_info *info, size_t num_info
2746);
2747
2748/* Unloads the currently loaded game. Called before retro_deinit(void). */
2749RETRO_API void retro_unload_game(void);
2750
2751/* Gets region of game. */
2752RETRO_API unsigned retro_get_region(void);
2753
2754/* Gets region of memory. */
2755RETRO_API void *retro_get_memory_data(unsigned id);
2756RETRO_API size_t retro_get_memory_size(unsigned id);
2757
2758#ifdef __cplusplus
2759}
2760#endif
2761
2762#endif