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1/* Copyright (C) 2010-2014 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) && !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/* Used for checking API/ABI mismatches that can break libretro
47 * implementations.
48 * It is not incremented for compatible changes to the API.
49 */
50#define RETRO_API_VERSION 1
51
52/*
53 * Libretro's fundamental device abstractions.
54 *
55 * Libretro's input system consists of some standardized device types,
56 * such as a joypad (with/without analog), mouse, keyboard, lightgun
57 * and a pointer.
58 *
59 * The functionality of these devices are fixed, and individual cores
60 * map their own concept of a controller to libretro's abstractions.
61 * This makes it possible for frontends to map the abstract types to a
62 * real input device, and not having to worry about binding input
63 * correctly to arbitrary controller layouts.
64 */
65
66#define RETRO_DEVICE_TYPE_SHIFT 8
67#define RETRO_DEVICE_MASK ((1 << RETRO_DEVICE_TYPE_SHIFT) - 1)
68#define RETRO_DEVICE_SUBCLASS(base, id) (((id + 1) << RETRO_DEVICE_TYPE_SHIFT) | base)
69
70/* Input disabled. */
71#define RETRO_DEVICE_NONE 0
72
73/* The JOYPAD is called RetroPad. It is essentially a Super Nintendo
74 * controller, but with additional L2/R2/L3/R3 buttons, similar to a
75 * PS1 DualShock. */
76#define RETRO_DEVICE_JOYPAD 1
77
78/* The mouse is a simple mouse, similar to Super Nintendo's mouse.
79 * X and Y coordinates are reported relatively to last poll (poll callback).
80 * It is up to the libretro implementation to keep track of where the mouse
81 * pointer is supposed to be on the screen.
82 * The frontend must make sure not to interfere with its own hardware
83 * mouse pointer.
84 */
85#define RETRO_DEVICE_MOUSE 2
86
87/* KEYBOARD device lets one poll for raw key pressed.
88 * It is poll based, so input callback will return with the current
89 * pressed state.
90 * For event/text based keyboard input, see
91 * RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK.
92 */
93#define RETRO_DEVICE_KEYBOARD 3
94
95/* Lightgun X/Y coordinates are reported relatively to last poll,
96 * similar to mouse. */
97#define RETRO_DEVICE_LIGHTGUN 4
98
99/* The ANALOG device is an extension to JOYPAD (RetroPad).
100 * Similar to DualShock it adds two analog sticks.
101 * This is treated as a separate device type as it returns values in the
102 * full analog range of [-0x8000, 0x7fff]. Positive X axis is right.
103 * Positive Y axis is down.
104 * Only use ANALOG type when polling for analog values of the axes.
105 */
106#define RETRO_DEVICE_ANALOG 5
107
108/* Abstracts the concept of a pointing mechanism, e.g. touch.
109 * This allows libretro to query in absolute coordinates where on the
110 * screen a mouse (or something similar) is being placed.
111 * For a touch centric device, coordinates reported are the coordinates
112 * of the press.
113 *
114 * Coordinates in X and Y are reported as:
115 * [-0x7fff, 0x7fff]: -0x7fff corresponds to the far left/top of the screen,
116 * and 0x7fff corresponds to the far right/bottom of the screen.
117 * The "screen" is here defined as area that is passed to the frontend and
118 * later displayed on the monitor.
119 *
120 * The frontend is free to scale/resize this screen as it sees fit, however,
121 * (X, Y) = (-0x7fff, -0x7fff) will correspond to the top-left pixel of the
122 * game image, etc.
123 *
124 * To check if the pointer coordinates are valid (e.g. a touch display
125 * actually being touched), PRESSED returns 1 or 0.
126 *
127 * If using a mouse on a desktop, PRESSED will usually correspond to the
128 * left mouse button, but this is a frontend decision.
129 * PRESSED will only return 1 if the pointer is inside the game screen.
130 *
131 * For multi-touch, the index variable can be used to successively query
132 * more presses.
133 * If index = 0 returns true for _PRESSED, coordinates can be extracted
134 * with _X, _Y for index = 0. One can then query _PRESSED, _X, _Y with
135 * index = 1, and so on.
136 * Eventually _PRESSED will return false for an index. No further presses
137 * are registered at this point. */
138#define RETRO_DEVICE_POINTER 6
139
140/* Buttons for the RetroPad (JOYPAD).
141 * The placement of these is equivalent to placements on the
142 * Super Nintendo controller.
143 * L2/R2/L3/R3 buttons correspond to the PS1 DualShock. */
144#define RETRO_DEVICE_ID_JOYPAD_B 0
145#define RETRO_DEVICE_ID_JOYPAD_Y 1
146#define RETRO_DEVICE_ID_JOYPAD_SELECT 2
147#define RETRO_DEVICE_ID_JOYPAD_START 3
148#define RETRO_DEVICE_ID_JOYPAD_UP 4
149#define RETRO_DEVICE_ID_JOYPAD_DOWN 5
150#define RETRO_DEVICE_ID_JOYPAD_LEFT 6
151#define RETRO_DEVICE_ID_JOYPAD_RIGHT 7
152#define RETRO_DEVICE_ID_JOYPAD_A 8
153#define RETRO_DEVICE_ID_JOYPAD_X 9
154#define RETRO_DEVICE_ID_JOYPAD_L 10
155#define RETRO_DEVICE_ID_JOYPAD_R 11
156#define RETRO_DEVICE_ID_JOYPAD_L2 12
157#define RETRO_DEVICE_ID_JOYPAD_R2 13
158#define RETRO_DEVICE_ID_JOYPAD_L3 14
159#define RETRO_DEVICE_ID_JOYPAD_R3 15
160
161/* Index / Id values for ANALOG device. */
162#define RETRO_DEVICE_INDEX_ANALOG_LEFT 0
163#define RETRO_DEVICE_INDEX_ANALOG_RIGHT 1
164#define RETRO_DEVICE_ID_ANALOG_X 0
165#define RETRO_DEVICE_ID_ANALOG_Y 1
166
167/* Id values for MOUSE. */
168#define RETRO_DEVICE_ID_MOUSE_X 0
169#define RETRO_DEVICE_ID_MOUSE_Y 1
170#define RETRO_DEVICE_ID_MOUSE_LEFT 2
171#define RETRO_DEVICE_ID_MOUSE_RIGHT 3
172#define RETRO_DEVICE_ID_MOUSE_WHEELUP 4
173#define RETRO_DEVICE_ID_MOUSE_WHEELDOWN 5
174#define RETRO_DEVICE_ID_MOUSE_MIDDLE 6
175
176/* Id values for LIGHTGUN types. */
177#define RETRO_DEVICE_ID_LIGHTGUN_X 0
178#define RETRO_DEVICE_ID_LIGHTGUN_Y 1
179#define RETRO_DEVICE_ID_LIGHTGUN_TRIGGER 2
180#define RETRO_DEVICE_ID_LIGHTGUN_CURSOR 3
181#define RETRO_DEVICE_ID_LIGHTGUN_TURBO 4
182#define RETRO_DEVICE_ID_LIGHTGUN_PAUSE 5
183#define RETRO_DEVICE_ID_LIGHTGUN_START 6
184
185/* Id values for POINTER. */
186#define RETRO_DEVICE_ID_POINTER_X 0
187#define RETRO_DEVICE_ID_POINTER_Y 1
188#define RETRO_DEVICE_ID_POINTER_PRESSED 2
189
190/* Returned from retro_get_region(). */
191#define RETRO_REGION_NTSC 0
192#define RETRO_REGION_PAL 1
193
194/* Id values for LANGUAGE */
195enum retro_language
196{
197 RETRO_LANGUAGE_ENGLISH = 0,
198 RETRO_LANGUAGE_JAPANESE = 1,
199 RETRO_LANGUAGE_FRENCH = 2,
200 RETRO_LANGUAGE_SPANISH = 3,
201 RETRO_LANGUAGE_GERMAN = 4,
202 RETRO_LANGUAGE_ITALIAN = 5,
203 RETRO_LANGUAGE_DUTCH = 6,
204 RETRO_LANGUAGE_PORTUGUESE = 7,
205 RETRO_LANGUAGE_RUSSIAN = 8,
206 RETRO_LANGUAGE_KOREAN = 9,
207 RETRO_LANGUAGE_CHINESE_TRADITIONAL = 10,
208 RETRO_LANGUAGE_CHINESE_SIMPLIFIED = 11,
209 RETRO_LANGUAGE_LAST,
210
211 /* Ensure sizeof(enum) == sizeof(int) */
212 RETRO_LANGUAGE_DUMMY = INT_MAX
213};
214
215/* Passed to retro_get_memory_data/size().
216 * If the memory type doesn't apply to the
217 * implementation NULL/0 can be returned.
218 */
219#define RETRO_MEMORY_MASK 0xff
220
221/* Regular save RAM. This RAM is usually found on a game cartridge,
222 * backed up by a battery.
223 * If save game data is too complex for a single memory buffer,
224 * the SAVE_DIRECTORY (preferably) or SYSTEM_DIRECTORY environment
225 * callback can be used. */
226#define RETRO_MEMORY_SAVE_RAM 0
227
228/* Some games have a built-in clock to keep track of time.
229 * This memory is usually just a couple of bytes to keep track of time.
230 */
231#define RETRO_MEMORY_RTC 1
232
233/* System ram lets a frontend peek into a game systems main RAM. */
234#define RETRO_MEMORY_SYSTEM_RAM 2
235
236/* Video ram lets a frontend peek into a game systems video RAM (VRAM). */
237#define RETRO_MEMORY_VIDEO_RAM 3
238
239/* Keysyms used for ID in input state callback when polling RETRO_KEYBOARD. */
240enum retro_key
241{
242 RETROK_UNKNOWN = 0,
243 RETROK_FIRST = 0,
244 RETROK_BACKSPACE = 8,
245 RETROK_TAB = 9,
246 RETROK_CLEAR = 12,
247 RETROK_RETURN = 13,
248 RETROK_PAUSE = 19,
249 RETROK_ESCAPE = 27,
250 RETROK_SPACE = 32,
251 RETROK_EXCLAIM = 33,
252 RETROK_QUOTEDBL = 34,
253 RETROK_HASH = 35,
254 RETROK_DOLLAR = 36,
255 RETROK_AMPERSAND = 38,
256 RETROK_QUOTE = 39,
257 RETROK_LEFTPAREN = 40,
258 RETROK_RIGHTPAREN = 41,
259 RETROK_ASTERISK = 42,
260 RETROK_PLUS = 43,
261 RETROK_COMMA = 44,
262 RETROK_MINUS = 45,
263 RETROK_PERIOD = 46,
264 RETROK_SLASH = 47,
265 RETROK_0 = 48,
266 RETROK_1 = 49,
267 RETROK_2 = 50,
268 RETROK_3 = 51,
269 RETROK_4 = 52,
270 RETROK_5 = 53,
271 RETROK_6 = 54,
272 RETROK_7 = 55,
273 RETROK_8 = 56,
274 RETROK_9 = 57,
275 RETROK_COLON = 58,
276 RETROK_SEMICOLON = 59,
277 RETROK_LESS = 60,
278 RETROK_EQUALS = 61,
279 RETROK_GREATER = 62,
280 RETROK_QUESTION = 63,
281 RETROK_AT = 64,
282 RETROK_LEFTBRACKET = 91,
283 RETROK_BACKSLASH = 92,
284 RETROK_RIGHTBRACKET = 93,
285 RETROK_CARET = 94,
286 RETROK_UNDERSCORE = 95,
287 RETROK_BACKQUOTE = 96,
288 RETROK_a = 97,
289 RETROK_b = 98,
290 RETROK_c = 99,
291 RETROK_d = 100,
292 RETROK_e = 101,
293 RETROK_f = 102,
294 RETROK_g = 103,
295 RETROK_h = 104,
296 RETROK_i = 105,
297 RETROK_j = 106,
298 RETROK_k = 107,
299 RETROK_l = 108,
300 RETROK_m = 109,
301 RETROK_n = 110,
302 RETROK_o = 111,
303 RETROK_p = 112,
304 RETROK_q = 113,
305 RETROK_r = 114,
306 RETROK_s = 115,
307 RETROK_t = 116,
308 RETROK_u = 117,
309 RETROK_v = 118,
310 RETROK_w = 119,
311 RETROK_x = 120,
312 RETROK_y = 121,
313 RETROK_z = 122,
314 RETROK_DELETE = 127,
315
316 RETROK_KP0 = 256,
317 RETROK_KP1 = 257,
318 RETROK_KP2 = 258,
319 RETROK_KP3 = 259,
320 RETROK_KP4 = 260,
321 RETROK_KP5 = 261,
322 RETROK_KP6 = 262,
323 RETROK_KP7 = 263,
324 RETROK_KP8 = 264,
325 RETROK_KP9 = 265,
326 RETROK_KP_PERIOD = 266,
327 RETROK_KP_DIVIDE = 267,
328 RETROK_KP_MULTIPLY = 268,
329 RETROK_KP_MINUS = 269,
330 RETROK_KP_PLUS = 270,
331 RETROK_KP_ENTER = 271,
332 RETROK_KP_EQUALS = 272,
333
334 RETROK_UP = 273,
335 RETROK_DOWN = 274,
336 RETROK_RIGHT = 275,
337 RETROK_LEFT = 276,
338 RETROK_INSERT = 277,
339 RETROK_HOME = 278,
340 RETROK_END = 279,
341 RETROK_PAGEUP = 280,
342 RETROK_PAGEDOWN = 281,
343
344 RETROK_F1 = 282,
345 RETROK_F2 = 283,
346 RETROK_F3 = 284,
347 RETROK_F4 = 285,
348 RETROK_F5 = 286,
349 RETROK_F6 = 287,
350 RETROK_F7 = 288,
351 RETROK_F8 = 289,
352 RETROK_F9 = 290,
353 RETROK_F10 = 291,
354 RETROK_F11 = 292,
355 RETROK_F12 = 293,
356 RETROK_F13 = 294,
357 RETROK_F14 = 295,
358 RETROK_F15 = 296,
359
360 RETROK_NUMLOCK = 300,
361 RETROK_CAPSLOCK = 301,
362 RETROK_SCROLLOCK = 302,
363 RETROK_RSHIFT = 303,
364 RETROK_LSHIFT = 304,
365 RETROK_RCTRL = 305,
366 RETROK_LCTRL = 306,
367 RETROK_RALT = 307,
368 RETROK_LALT = 308,
369 RETROK_RMETA = 309,
370 RETROK_LMETA = 310,
371 RETROK_LSUPER = 311,
372 RETROK_RSUPER = 312,
373 RETROK_MODE = 313,
374 RETROK_COMPOSE = 314,
375
376 RETROK_HELP = 315,
377 RETROK_PRINT = 316,
378 RETROK_SYSREQ = 317,
379 RETROK_BREAK = 318,
380 RETROK_MENU = 319,
381 RETROK_POWER = 320,
382 RETROK_EURO = 321,
383 RETROK_UNDO = 322,
384
385 RETROK_LAST,
386
387 RETROK_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
388};
389
390enum retro_mod
391{
392 RETROKMOD_NONE = 0x0000,
393
394 RETROKMOD_SHIFT = 0x01,
395 RETROKMOD_CTRL = 0x02,
396 RETROKMOD_ALT = 0x04,
397 RETROKMOD_META = 0x08,
398
399 RETROKMOD_NUMLOCK = 0x10,
400 RETROKMOD_CAPSLOCK = 0x20,
401 RETROKMOD_SCROLLOCK = 0x40,
402
403 RETROKMOD_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
404};
405
406/* If set, this call is not part of the public libretro API yet. It can
407 * change or be removed at any time. */
408#define RETRO_ENVIRONMENT_EXPERIMENTAL 0x10000
409/* Environment callback to be used internally in frontend. */
410#define RETRO_ENVIRONMENT_PRIVATE 0x20000
411
412/* Environment commands. */
413#define RETRO_ENVIRONMENT_SET_ROTATION 1 /* const unsigned * --
414 * Sets screen rotation of graphics.
415 * Is only implemented if rotation can be accelerated by hardware.
416 * Valid values are 0, 1, 2, 3, which rotates screen by 0, 90, 180,
417 * 270 degrees counter-clockwise respectively.
418 */
419#define RETRO_ENVIRONMENT_GET_OVERSCAN 2 /* bool * --
420 * Boolean value whether or not the implementation should use overscan,
421 * or crop away overscan.
422 */
423#define RETRO_ENVIRONMENT_GET_CAN_DUPE 3 /* bool * --
424 * Boolean value whether or not frontend supports frame duping,
425 * passing NULL to video frame callback.
426 */
427
428 /* Environ 4, 5 are no longer supported (GET_VARIABLE / SET_VARIABLES),
429 * and reserved to avoid possible ABI clash.
430 */
431
432#define RETRO_ENVIRONMENT_SET_MESSAGE 6 /* const struct retro_message * --
433 * Sets a message to be displayed in implementation-specific manner
434 * for a certain amount of 'frames'.
435 * Should not be used for trivial messages, which should simply be
436 * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a
437 * fallback, stderr).
438 */
439#define RETRO_ENVIRONMENT_SHUTDOWN 7 /* N/A (NULL) --
440 * Requests the frontend to shutdown.
441 * Should only be used if game has a specific
442 * way to shutdown the game from a menu item or similar.
443 */
444#define RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL 8
445 /* const unsigned * --
446 * Gives a hint to the frontend how demanding this implementation
447 * is on a system. E.g. reporting a level of 2 means
448 * this implementation should run decently on all frontends
449 * of level 2 and up.
450 *
451 * It can be used by the frontend to potentially warn
452 * about too demanding implementations.
453 *
454 * The levels are "floating".
455 *
456 * This function can be called on a per-game basis,
457 * as certain games an implementation can play might be
458 * particularly demanding.
459 * If called, it should be called in retro_load_game().
460 */
461#define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9
462 /* const char ** --
463 * Returns the "system" directory of the frontend.
464 * This directory can be used to store system specific
465 * content such as BIOSes, configuration data, etc.
466 * The returned value can be NULL.
467 * If so, no such directory is defined,
468 * and it's up to the implementation to find a suitable directory.
469 *
470 * NOTE: Some cores used this folder also for "save" data such as
471 * memory cards, etc, for lack of a better place to put it.
472 * This is now discouraged, and if possible, cores should try to
473 * use the new GET_SAVE_DIRECTORY.
474 */
475#define RETRO_ENVIRONMENT_SET_PIXEL_FORMAT 10
476 /* const enum retro_pixel_format * --
477 * Sets the internal pixel format used by the implementation.
478 * The default pixel format is RETRO_PIXEL_FORMAT_0RGB1555.
479 * This pixel format however, is deprecated (see enum retro_pixel_format).
480 * If the call returns false, the frontend does not support this pixel
481 * format.
482 *
483 * This function should be called inside retro_load_game() or
484 * retro_get_system_av_info().
485 */
486#define RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS 11
487 /* const struct retro_input_descriptor * --
488 * Sets an array of retro_input_descriptors.
489 * It is up to the frontend to present this in a usable way.
490 * The array is terminated by retro_input_descriptor::description
491 * being set to NULL.
492 * This function can be called at any time, but it is recommended
493 * to call it as early as possible.
494 */
495#define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12
496 /* const struct retro_keyboard_callback * --
497 * Sets a callback function used to notify core about keyboard events.
498 */
499#define RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE 13
500 /* const struct retro_disk_control_callback * --
501 * Sets an interface which frontend can use to eject and insert
502 * disk images.
503 * This is used for games which consist of multiple images and
504 * must be manually swapped out by the user (e.g. PSX).
505 */
506#define RETRO_ENVIRONMENT_SET_HW_RENDER 14
507 /* struct retro_hw_render_callback * --
508 * Sets an interface to let a libretro core render with
509 * hardware acceleration.
510 * Should be called in retro_load_game().
511 * If successful, libretro cores will be able to render to a
512 * frontend-provided framebuffer.
513 * The size of this framebuffer will be at least as large as
514 * max_width/max_height provided in get_av_info().
515 * If HW rendering is used, pass only RETRO_HW_FRAME_BUFFER_VALID or
516 * NULL to retro_video_refresh_t.
517 */
518#define RETRO_ENVIRONMENT_GET_VARIABLE 15
519 /* struct retro_variable * --
520 * Interface to acquire user-defined information from environment
521 * that cannot feasibly be supported in a multi-system way.
522 * 'key' should be set to a key which has already been set by
523 * SET_VARIABLES.
524 * 'data' will be set to a value or NULL.
525 */
526#define RETRO_ENVIRONMENT_SET_VARIABLES 16
527 /* const struct retro_variable * --
528 * Allows an implementation to signal the environment
529 * which variables it might want to check for later using
530 * GET_VARIABLE.
531 * This allows the frontend to present these variables to
532 * a user dynamically.
533 * This should be called as early as possible (ideally in
534 * retro_set_environment).
535 *
536 * 'data' points to an array of retro_variable structs
537 * terminated by a { NULL, NULL } element.
538 * retro_variable::key should be namespaced to not collide
539 * with other implementations' keys. E.g. A core called
540 * 'foo' should use keys named as 'foo_option'.
541 * retro_variable::value should contain a human readable
542 * description of the key as well as a '|' delimited list
543 * of expected values.
544 *
545 * The number of possible options should be very limited,
546 * i.e. it should be feasible to cycle through options
547 * without a keyboard.
548 *
549 * First entry should be treated as a default.
550 *
551 * Example entry:
552 * { "foo_option", "Speed hack coprocessor X; false|true" }
553 *
554 * Text before first ';' is description. This ';' must be
555 * followed by a space, and followed by a list of possible
556 * values split up with '|'.
557 *
558 * Only strings are operated on. The possible values will
559 * generally be displayed and stored as-is by the frontend.
560 */
561#define RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE 17
562 /* bool * --
563 * Result is set to true if some variables are updated by
564 * frontend since last call to RETRO_ENVIRONMENT_GET_VARIABLE.
565 * Variables should be queried with GET_VARIABLE.
566 */
567#define RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME 18
568 /* const bool * --
569 * If true, the libretro implementation supports calls to
570 * retro_load_game() with NULL as argument.
571 * Used by cores which can run without particular game data.
572 * This should be called within retro_set_environment() only.
573 */
574#define RETRO_ENVIRONMENT_GET_LIBRETRO_PATH 19
575 /* const char ** --
576 * Retrieves the absolute path from where this libretro
577 * implementation was loaded.
578 * NULL is returned if the libretro was loaded statically
579 * (i.e. linked statically to frontend), or if the path cannot be
580 * determined.
581 * Mostly useful in cooperation with SET_SUPPORT_NO_GAME as assets can
582 * be loaded without ugly hacks.
583 */
584
585 /* Environment 20 was an obsolete version of SET_AUDIO_CALLBACK.
586 * It was not used by any known core at the time,
587 * and was removed from the API. */
588#define RETRO_ENVIRONMENT_SET_AUDIO_CALLBACK 22
589 /* const struct retro_audio_callback * --
590 * Sets an interface which is used to notify a libretro core about audio
591 * being available for writing.
592 * The callback can be called from any thread, so a core using this must
593 * have a thread safe audio implementation.
594 * It is intended for games where audio and video are completely
595 * asynchronous and audio can be generated on the fly.
596 * This interface is not recommended for use with emulators which have
597 * highly synchronous audio.
598 *
599 * The callback only notifies about writability; the libretro core still
600 * has to call the normal audio callbacks
601 * to write audio. The audio callbacks must be called from within the
602 * notification callback.
603 * The amount of audio data to write is up to the implementation.
604 * Generally, the audio callback will be called continously in a loop.
605 *
606 * Due to thread safety guarantees and lack of sync between audio and
607 * video, a frontend can selectively disallow this interface based on
608 * internal configuration. A core using this interface must also
609 * implement the "normal" audio interface.
610 *
611 * A libretro core using SET_AUDIO_CALLBACK should also make use of
612 * SET_FRAME_TIME_CALLBACK.
613 */
614#define RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK 21
615 /* const struct retro_frame_time_callback * --
616 * Lets the core know how much time has passed since last
617 * invocation of retro_run().
618 * The frontend can tamper with the timing to fake fast-forward,
619 * slow-motion, frame stepping, etc.
620 * In this case the delta time will use the reference value
621 * in frame_time_callback..
622 */
623#define RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE 23
624 /* struct retro_rumble_interface * --
625 * Gets an interface which is used by a libretro core to set
626 * state of rumble motors in controllers.
627 * A strong and weak motor is supported, and they can be
628 * controlled indepedently.
629 */
630#define RETRO_ENVIRONMENT_GET_INPUT_DEVICE_CAPABILITIES 24
631 /* uint64_t * --
632 * Gets a bitmask telling which device type are expected to be
633 * handled properly in a call to retro_input_state_t.
634 * Devices which are not handled or recognized always return
635 * 0 in retro_input_state_t.
636 * Example bitmask: caps = (1 << RETRO_DEVICE_JOYPAD) | (1 << RETRO_DEVICE_ANALOG).
637 * Should only be called in retro_run().
638 */
639#define RETRO_ENVIRONMENT_GET_SENSOR_INTERFACE (25 | RETRO_ENVIRONMENT_EXPERIMENTAL)
640 /* struct retro_sensor_interface * --
641 * Gets access to the sensor interface.
642 * The purpose of this interface is to allow
643 * setting state related to sensors such as polling rate,
644 * enabling/disable it entirely, etc.
645 * Reading sensor state is done via the normal
646 * input_state_callback API.
647 */
648#define RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE (26 | RETRO_ENVIRONMENT_EXPERIMENTAL)
649 /* struct retro_camera_callback * --
650 * Gets an interface to a video camera driver.
651 * A libretro core can use this interface to get access to a
652 * video camera.
653 * New video frames are delivered in a callback in same
654 * thread as retro_run().
655 *
656 * GET_CAMERA_INTERFACE should be called in retro_load_game().
657 *
658 * Depending on the camera implementation used, camera frames
659 * will be delivered as a raw framebuffer,
660 * or as an OpenGL texture directly.
661 *
662 * The core has to tell the frontend here which types of
663 * buffers can be handled properly.
664 * An OpenGL texture can only be handled when using a
665 * libretro GL core (SET_HW_RENDER).
666 * It is recommended to use a libretro GL core when
667 * using camera interface.
668 *
669 * The camera is not started automatically. The retrieved start/stop
670 * functions must be used to explicitly
671 * start and stop the camera driver.
672 */
673#define RETRO_ENVIRONMENT_GET_LOG_INTERFACE 27
674 /* struct retro_log_callback * --
675 * Gets an interface for logging. This is useful for
676 * logging in a cross-platform way
677 * as certain platforms cannot use use stderr for logging.
678 * It also allows the frontend to
679 * show logging information in a more suitable way.
680 * If this interface is not used, libretro cores should
681 * log to stderr as desired.
682 */
683#define RETRO_ENVIRONMENT_GET_PERF_INTERFACE 28
684 /* struct retro_perf_callback * --
685 * Gets an interface for performance counters. This is useful
686 * for performance logging in a cross-platform way and for detecting
687 * architecture-specific features, such as SIMD support.
688 */
689#define RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE 29
690 /* struct retro_location_callback * --
691 * Gets access to the location interface.
692 * The purpose of this interface is to be able to retrieve
693 * location-based information from the host device,
694 * such as current latitude / longitude.
695 */
696#define RETRO_ENVIRONMENT_GET_CONTENT_DIRECTORY 30
697 /* const char ** --
698 * Returns the "content" directory of the frontend.
699 * This directory can be used to store specific assets that the
700 * core relies upon, such as art assets,
701 * input data, etc etc.
702 * The returned value can be NULL.
703 * If so, no such directory is defined,
704 * and it's up to the implementation to find a suitable directory.
705 */
706#define RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY 31
707 /* const char ** --
708 * Returns the "save" directory of the frontend.
709 * This directory can be used to store SRAM, memory cards,
710 * high scores, etc, if the libretro core
711 * cannot use the regular memory interface (retro_get_memory_data()).
712 *
713 * NOTE: libretro cores used to check GET_SYSTEM_DIRECTORY for
714 * similar things before.
715 * They should still check GET_SYSTEM_DIRECTORY if they want to
716 * be backwards compatible.
717 * The path here can be NULL. It should only be non-NULL if the
718 * frontend user has set a specific save path.
719 */
720#define RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO 32
721 /* const struct retro_system_av_info * --
722 * Sets a new av_info structure. This can only be called from
723 * within retro_run().
724 * This should *only* be used if the core is completely altering the
725 * internal resolutions, aspect ratios, timings, sampling rate, etc.
726 * Calling this can require a full reinitialization of video/audio
727 * drivers in the frontend,
728 *
729 * so it is important to call it very sparingly, and usually only with
730 * the users explicit consent.
731 * An eventual driver reinitialize will happen so that video and
732 * audio callbacks
733 * happening after this call within the same retro_run() call will
734 * target the newly initialized driver.
735 *
736 * This callback makes it possible to support configurable resolutions
737 * in games, which can be useful to
738 * avoid setting the "worst case" in max_width/max_height.
739 *
740 * ***HIGHLY RECOMMENDED*** Do not call this callback every time
741 * resolution changes in an emulator core if it's
742 * expected to be a temporary change, for the reasons of possible
743 * driver reinitialization.
744 * This call is not a free pass for not trying to provide
745 * correct values in retro_get_system_av_info(). If you need to change
746 * things like aspect ratio or nominal width/height,
747 * use RETRO_ENVIRONMENT_SET_GEOMETRY, which is a softer variant
748 * of SET_SYSTEM_AV_INFO.
749 *
750 * If this returns false, the frontend does not acknowledge a
751 * changed av_info struct.
752 */
753#define RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK 33
754 /* const struct retro_get_proc_address_interface * --
755 * Allows a libretro core to announce support for the
756 * get_proc_address() interface.
757 * This interface allows for a standard way to extend libretro where
758 * use of environment calls are too indirect,
759 * e.g. for cases where the frontend wants to call directly into the core.
760 *
761 * If a core wants to expose this interface, SET_PROC_ADDRESS_CALLBACK
762 * **MUST** be called from within retro_set_environment().
763 */
764#define RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO 34
765 /* const struct retro_subsystem_info * --
766 * This environment call introduces the concept of libretro "subsystems".
767 * A subsystem is a variant of a libretro core which supports
768 * different kinds of games.
769 * The purpose of this is to support e.g. emulators which might
770 * have special needs, e.g. Super Nintendo's Super GameBoy, Sufami Turbo.
771 * It can also be used to pick among subsystems in an explicit way
772 * if the libretro implementation is a multi-system emulator itself.
773 *
774 * Loading a game via a subsystem is done with retro_load_game_special(),
775 * and this environment call allows a libretro core to expose which
776 * subsystems are supported for use with retro_load_game_special().
777 * A core passes an array of retro_game_special_info which is terminated
778 * with a zeroed out retro_game_special_info struct.
779 *
780 * If a core wants to use this functionality, SET_SUBSYSTEM_INFO
781 * **MUST** be called from within retro_set_environment().
782 */
783#define RETRO_ENVIRONMENT_SET_CONTROLLER_INFO 35
784 /* const struct retro_controller_info * --
785 * This environment call lets a libretro core tell the frontend
786 * which controller types are recognized in calls to
787 * retro_set_controller_port_device().
788 *
789 * Some emulators such as Super Nintendo
790 * support multiple lightgun types which must be specifically
791 * selected from.
792 * It is therefore sometimes necessary for a frontend to be able
793 * to tell the core about a special kind of input device which is
794 * not covered by the libretro input API.
795 *
796 * In order for a frontend to understand the workings of an input device,
797 * it must be a specialized type
798 * of the generic device types already defined in the libretro API.
799 *
800 * Which devices are supported can vary per input port.
801 * The core must pass an array of const struct retro_controller_info which
802 * is terminated with a blanked out struct. Each element of the struct
803 * corresponds to an ascending port index to
804 * retro_set_controller_port_device().
805 * Even if special device types are set in the libretro core,
806 * libretro should only poll input based on the base input device types.
807 */
808#define RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL)
809 /* const struct retro_memory_map * --
810 * This environment call lets a libretro core tell the frontend
811 * about the memory maps this core emulates.
812 * This can be used to implement, for example, cheats in a core-agnostic way.
813 *
814 * Should only be used by emulators; it doesn't make much sense for
815 * anything else.
816 * It is recommended to expose all relevant pointers through
817 * retro_get_memory_* as well.
818 *
819 * Can be called from retro_init and retro_load_game.
820 */
821#define RETRO_ENVIRONMENT_SET_GEOMETRY 37
822 /* const struct retro_game_geometry * --
823 * This environment call is similar to SET_SYSTEM_AV_INFO for changing
824 * video parameters, but provides a guarantee that drivers will not be
825 * reinitialized.
826 * This can only be called from within retro_run().
827 *
828 * The purpose of this call is to allow a core to alter nominal
829 * width/heights as well as aspect ratios on-the-fly, which can be
830 * useful for some emulators to change in run-time.
831 *
832 * max_width/max_height arguments are ignored and cannot be changed
833 * with this call as this could potentially require a reinitialization or a
834 * non-constant time operation.
835 * If max_width/max_height are to be changed, SET_SYSTEM_AV_INFO is required.
836 *
837 * A frontend must guarantee that this environment call completes in
838 * constant time.
839 */
840#define RETRO_ENVIRONMENT_GET_USERNAME 38
841 /* const char **
842 * Returns the specified username of the frontend, if specified by the user.
843 * This username can be used as a nickname for a core that has online facilities
844 * or any other mode where personalization of the user is desirable.
845 * The returned value can be NULL.
846 * If this environ callback is used by a core that requires a valid username,
847 * a default username should be specified by the core.
848 */
849#define RETRO_ENVIRONMENT_GET_LANGUAGE 39
850 /* unsigned * --
851 * Returns the specified language of the frontend, if specified by the user.
852 * It can be used by the core for localization purposes.
853 */
854
855#define RETRO_MEMDESC_CONST (1 << 0) /* The frontend will never change this memory area once retro_load_game has returned. */
856#define RETRO_MEMDESC_BIGENDIAN (1 << 1) /* The memory area contains big endian data. Default is little endian. */
857#define RETRO_MEMDESC_ALIGN_2 (1 << 16) /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */
858#define RETRO_MEMDESC_ALIGN_4 (2 << 16)
859#define RETRO_MEMDESC_ALIGN_8 (3 << 16)
860#define RETRO_MEMDESC_MINSIZE_2 (1 << 24) /* All memory in this region is accessed at least 2 bytes at the time. */
861#define RETRO_MEMDESC_MINSIZE_4 (2 << 24)
862#define RETRO_MEMDESC_MINSIZE_8 (3 << 24)
863struct retro_memory_descriptor
864{
865 uint64_t flags;
866
867 /* Pointer to the start of the relevant ROM or RAM chip.
868 * It's strongly recommended to use 'offset' if possible, rather than
869 * doing math on the pointer.
870 *
871 * If the same byte is mapped my multiple descriptors, their descriptors
872 * must have the same pointer.
873 * If 'start' does not point to the first byte in the pointer, put the
874 * difference in 'offset' instead.
875 *
876 * May be NULL if there's nothing usable here (e.g. hardware registers and
877 * open bus). No flags should be set if the pointer is NULL.
878 * It's recommended to minimize the number of descriptors if possible,
879 * but not mandatory. */
880 void *ptr;
881 size_t offset;
882
883 /* This is the location in the emulated address space
884 * where the mapping starts. */
885 size_t start;
886
887 /* Which bits must be same as in 'start' for this mapping to apply.
888 * The first memory descriptor to claim a certain byte is the one
889 * that applies.
890 * A bit which is set in 'start' must also be set in this.
891 * Can be zero, in which case each byte is assumed mapped exactly once.
892 * In this case, 'len' must be a power of two. */
893 size_t select;
894
895 /* If this is nonzero, the set bits are assumed not connected to the
896 * memory chip's address pins. */
897 size_t disconnect;
898
899 /* This one tells the size of the current memory area.
900 * If, after start+disconnect are applied, the address is higher than
901 * this, the highest bit of the address is cleared.
902 *
903 * If the address is still too high, the next highest bit is cleared.
904 * Can be zero, in which case it's assumed to be infinite (as limited
905 * by 'select' and 'disconnect'). */
906 size_t len;
907
908 /* To go from emulated address to physical address, the following
909 * order applies:
910 * Subtract 'start', pick off 'disconnect', apply 'len', add 'offset'.
911 *
912 * The address space name must consist of only a-zA-Z0-9_-,
913 * should be as short as feasible (maximum length is 8 plus the NUL),
914 * and may not be any other address space plus one or more 0-9A-F
915 * at the end.
916 * However, multiple memory descriptors for the same address space is
917 * allowed, and the address space name can be empty. NULL is treated
918 * as empty.
919 *
920 * Address space names are case sensitive, but avoid lowercase if possible.
921 * The same pointer may exist in multiple address spaces.
922 *
923 * Examples:
924 * blank+blank - valid (multiple things may be mapped in the same namespace)
925 * 'Sp'+'Sp' - valid (multiple things may be mapped in the same namespace)
926 * 'A'+'B' - valid (neither is a prefix of each other)
927 * 'S'+blank - valid ('S' is not in 0-9A-F)
928 * 'a'+blank - valid ('a' is not in 0-9A-F)
929 * 'a'+'A' - valid (neither is a prefix of each other)
930 * 'AR'+blank - valid ('R' is not in 0-9A-F)
931 * 'ARB'+blank - valid (the B can't be part of the address either, because
932 * there is no namespace 'AR')
933 * blank+'B' - not valid, because it's ambigous which address space B1234
934 * would refer to.
935 * The length can't be used for that purpose; the frontend may want
936 * to append arbitrary data to an address, without a separator. */
937 const char *addrspace;
938};
939
940/* The frontend may use the largest value of 'start'+'select' in a
941 * certain namespace to infer the size of the address space.
942 *
943 * If the address space is larger than that, a mapping with .ptr=NULL
944 * should be at the end of the array, with .select set to all ones for
945 * as long as the address space is big.
946 *
947 * Sample descriptors (minus .ptr, and RETRO_MEMFLAG_ on the flags):
948 * SNES WRAM:
949 * .start=0x7E0000, .len=0x20000
950 * (Note that this must be mapped before the ROM in most cases; some of the
951 * ROM mappers
952 * try to claim $7E0000, or at least $7E8000.)
953 * SNES SPC700 RAM:
954 * .addrspace="S", .len=0x10000
955 * SNES WRAM mirrors:
956 * .flags=MIRROR, .start=0x000000, .select=0xC0E000, .len=0x2000
957 * .flags=MIRROR, .start=0x800000, .select=0xC0E000, .len=0x2000
958 * SNES WRAM mirrors, alternate equivalent descriptor:
959 * .flags=MIRROR, .select=0x40E000, .disconnect=~0x1FFF
960 * (Various similar constructions can be created by combining parts of
961 * the above two.)
962 * SNES LoROM (512KB, mirrored a couple of times):
963 * .flags=CONST, .start=0x008000, .select=0x408000, .disconnect=0x8000, .len=512*1024
964 * .flags=CONST, .start=0x400000, .select=0x400000, .disconnect=0x8000, .len=512*1024
965 * SNES HiROM (4MB):
966 * .flags=CONST, .start=0x400000, .select=0x400000, .len=4*1024*1024
967 * .flags=CONST, .offset=0x8000, .start=0x008000, .select=0x408000, .len=4*1024*1024
968 * SNES ExHiROM (8MB):
969 * .flags=CONST, .offset=0, .start=0xC00000, .select=0xC00000, .len=4*1024*1024
970 * .flags=CONST, .offset=4*1024*1024, .start=0x400000, .select=0xC00000, .len=4*1024*1024
971 * .flags=CONST, .offset=0x8000, .start=0x808000, .select=0xC08000, .len=4*1024*1024
972 * .flags=CONST, .offset=4*1024*1024+0x8000, .start=0x008000, .select=0xC08000, .len=4*1024*1024
973 * Clarify the size of the address space:
974 * .ptr=NULL, .select=0xFFFFFF
975 * .len can be implied by .select in many of them, but was included for clarity.
976 */
977
978struct retro_memory_map
979{
980 const struct retro_memory_descriptor *descriptors;
981 unsigned num_descriptors;
982};
983
984struct retro_controller_description
985{
986 /* Human-readable description of the controller. Even if using a generic
987 * input device type, this can be set to the particular device type the
988 * core uses. */
989 const char *desc;
990
991 /* Device type passed to retro_set_controller_port_device(). If the device
992 * type is a sub-class of a generic input device type, use the
993 * RETRO_DEVICE_SUBCLASS macro to create an ID.
994 *
995 * E.g. RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1). */
996 unsigned id;
997};
998
999struct retro_controller_info
1000{
1001 const struct retro_controller_description *types;
1002 unsigned num_types;
1003};
1004
1005struct retro_subsystem_memory_info
1006{
1007 /* The extension associated with a memory type, e.g. "psram". */
1008 const char *extension;
1009
1010 /* The memory type for retro_get_memory(). This should be at
1011 * least 0x100 to avoid conflict with standardized
1012 * libretro memory types. */
1013 unsigned type;
1014};
1015
1016struct retro_subsystem_rom_info
1017{
1018 /* Describes what the content is (SGB BIOS, GB ROM, etc). */
1019 const char *desc;
1020
1021 /* Same definition as retro_get_system_info(). */
1022 const char *valid_extensions;
1023
1024 /* Same definition as retro_get_system_info(). */
1025 bool need_fullpath;
1026
1027 /* Same definition as retro_get_system_info(). */
1028 bool block_extract;
1029
1030 /* This is set if the content is required to load a game.
1031 * If this is set to false, a zeroed-out retro_game_info can be passed. */
1032 bool required;
1033
1034 /* Content can have multiple associated persistent
1035 * memory types (retro_get_memory()). */
1036 const struct retro_subsystem_memory_info *memory;
1037 unsigned num_memory;
1038};
1039
1040struct retro_subsystem_info
1041{
1042 /* Human-readable string of the subsystem type, e.g. "Super GameBoy" */
1043 const char *desc;
1044
1045 /* A computer friendly short string identifier for the subsystem type.
1046 * This name must be [a-z].
1047 * E.g. if desc is "Super GameBoy", this can be "sgb".
1048 * This identifier can be used for command-line interfaces, etc.
1049 */
1050 const char *ident;
1051
1052 /* Infos for each content file. The first entry is assumed to be the
1053 * "most significant" content for frontend purposes.
1054 * E.g. with Super GameBoy, the first content should be the GameBoy ROM,
1055 * as it is the most "significant" content to a user.
1056 * If a frontend creates new file paths based on the content used
1057 * (e.g. savestates), it should use the path for the first ROM to do so. */
1058 const struct retro_subsystem_rom_info *roms;
1059
1060 /* Number of content files associated with a subsystem. */
1061 unsigned num_roms;
1062
1063 /* The type passed to retro_load_game_special(). */
1064 unsigned id;
1065};
1066
1067typedef void (*retro_proc_address_t)(void);
1068
1069/* libretro API extension functions:
1070 * (None here so far).
1071 *
1072 * Get a symbol from a libretro core.
1073 * Cores should only return symbols which are actual
1074 * extensions to the libretro API.
1075 *
1076 * Frontends should not use this to obtain symbols to standard
1077 * libretro entry points (static linking or dlsym).
1078 *
1079 * The symbol name must be equal to the function name,
1080 * e.g. if void retro_foo(void); exists, the symbol must be called "retro_foo".
1081 * The returned function pointer must be cast to the corresponding type.
1082 */
1083typedef retro_proc_address_t (*retro_get_proc_address_t)(const char *sym);
1084
1085struct retro_get_proc_address_interface
1086{
1087 retro_get_proc_address_t get_proc_address;
1088};
1089
1090enum retro_log_level
1091{
1092 RETRO_LOG_DEBUG = 0,
1093 RETRO_LOG_INFO,
1094 RETRO_LOG_WARN,
1095 RETRO_LOG_ERROR,
1096
1097 RETRO_LOG_DUMMY = INT_MAX
1098};
1099
1100/* Logging function. Takes log level argument as well. */
1101typedef void (*retro_log_printf_t)(enum retro_log_level level,
1102 const char *fmt, ...);
1103
1104struct retro_log_callback
1105{
1106 retro_log_printf_t log;
1107};
1108
1109/* Performance related functions */
1110
1111/* ID values for SIMD CPU features */
1112#define RETRO_SIMD_SSE (1 << 0)
1113#define RETRO_SIMD_SSE2 (1 << 1)
1114#define RETRO_SIMD_VMX (1 << 2)
1115#define RETRO_SIMD_VMX128 (1 << 3)
1116#define RETRO_SIMD_AVX (1 << 4)
1117#define RETRO_SIMD_NEON (1 << 5)
1118#define RETRO_SIMD_SSE3 (1 << 6)
1119#define RETRO_SIMD_SSSE3 (1 << 7)
1120#define RETRO_SIMD_MMX (1 << 8)
1121#define RETRO_SIMD_MMXEXT (1 << 9)
1122#define RETRO_SIMD_SSE4 (1 << 10)
1123#define RETRO_SIMD_SSE42 (1 << 11)
1124#define RETRO_SIMD_AVX2 (1 << 12)
1125#define RETRO_SIMD_VFPU (1 << 13)
1126#define RETRO_SIMD_PS (1 << 14)
1127#define RETRO_SIMD_AES (1 << 15)
1128
1129typedef uint64_t retro_perf_tick_t;
1130typedef int64_t retro_time_t;
1131
1132struct retro_perf_counter
1133{
1134 const char *ident;
1135 retro_perf_tick_t start;
1136 retro_perf_tick_t total;
1137 retro_perf_tick_t call_cnt;
1138
1139 bool registered;
1140};
1141
1142/* Returns current time in microseconds.
1143 * Tries to use the most accurate timer available.
1144 */
1145typedef retro_time_t (*retro_perf_get_time_usec_t)(void);
1146
1147/* A simple counter. Usually nanoseconds, but can also be CPU cycles.
1148 * Can be used directly if desired (when creating a more sophisticated
1149 * performance counter system).
1150 * */
1151typedef retro_perf_tick_t (*retro_perf_get_counter_t)(void);
1152
1153/* Returns a bit-mask of detected CPU features (RETRO_SIMD_*). */
1154typedef uint64_t (*retro_get_cpu_features_t)(void);
1155
1156/* Asks frontend to log and/or display the state of performance counters.
1157 * Performance counters can always be poked into manually as well.
1158 */
1159typedef void (*retro_perf_log_t)(void);
1160
1161/* Register a performance counter.
1162 * ident field must be set with a discrete value and other values in
1163 * retro_perf_counter must be 0.
1164 * Registering can be called multiple times. To avoid calling to
1165 * frontend redundantly, you can check registered field first. */
1166typedef void (*retro_perf_register_t)(struct retro_perf_counter *counter);
1167
1168/* Starts a registered counter. */
1169typedef void (*retro_perf_start_t)(struct retro_perf_counter *counter);
1170
1171/* Stops a registered counter. */
1172typedef void (*retro_perf_stop_t)(struct retro_perf_counter *counter);
1173
1174/* For convenience it can be useful to wrap register, start and stop in macros.
1175 * E.g.:
1176 * #ifdef LOG_PERFORMANCE
1177 * #define RETRO_PERFORMANCE_INIT(perf_cb, name) static struct retro_perf_counter name = {#name}; if (!name.registered) perf_cb.perf_register(&(name))
1178 * #define RETRO_PERFORMANCE_START(perf_cb, name) perf_cb.perf_start(&(name))
1179 * #define RETRO_PERFORMANCE_STOP(perf_cb, name) perf_cb.perf_stop(&(name))
1180 * #else
1181 * ... Blank macros ...
1182 * #endif
1183 *
1184 * These can then be used mid-functions around code snippets.
1185 *
1186 * extern struct retro_perf_callback perf_cb; * Somewhere in the core.
1187 *
1188 * void do_some_heavy_work(void)
1189 * {
1190 * RETRO_PERFORMANCE_INIT(cb, work_1;
1191 * RETRO_PERFORMANCE_START(cb, work_1);
1192 * heavy_work_1();
1193 * RETRO_PERFORMANCE_STOP(cb, work_1);
1194 *
1195 * RETRO_PERFORMANCE_INIT(cb, work_2);
1196 * RETRO_PERFORMANCE_START(cb, work_2);
1197 * heavy_work_2();
1198 * RETRO_PERFORMANCE_STOP(cb, work_2);
1199 * }
1200 *
1201 * void retro_deinit(void)
1202 * {
1203 * perf_cb.perf_log(); * Log all perf counters here for example.
1204 * }
1205 */
1206
1207struct retro_perf_callback
1208{
1209 retro_perf_get_time_usec_t get_time_usec;
1210 retro_get_cpu_features_t get_cpu_features;
1211
1212 retro_perf_get_counter_t get_perf_counter;
1213 retro_perf_register_t perf_register;
1214 retro_perf_start_t perf_start;
1215 retro_perf_stop_t perf_stop;
1216 retro_perf_log_t perf_log;
1217};
1218
1219/* FIXME: Document the sensor API and work out behavior.
1220 * It will be marked as experimental until then.
1221 */
1222enum retro_sensor_action
1223{
1224 RETRO_SENSOR_ACCELEROMETER_ENABLE = 0,
1225 RETRO_SENSOR_ACCELEROMETER_DISABLE,
1226
1227 RETRO_SENSOR_DUMMY = INT_MAX
1228};
1229
1230/* Id values for SENSOR types. */
1231#define RETRO_SENSOR_ACCELEROMETER_X 0
1232#define RETRO_SENSOR_ACCELEROMETER_Y 1
1233#define RETRO_SENSOR_ACCELEROMETER_Z 2
1234
1235typedef bool (*retro_set_sensor_state_t)(unsigned port,
1236 enum retro_sensor_action action, unsigned rate);
1237
1238typedef float (*retro_sensor_get_input_t)(unsigned port, unsigned id);
1239
1240struct retro_sensor_interface
1241{
1242 retro_set_sensor_state_t set_sensor_state;
1243 retro_sensor_get_input_t get_sensor_input;
1244};
1245
1246enum retro_camera_buffer
1247{
1248 RETRO_CAMERA_BUFFER_OPENGL_TEXTURE = 0,
1249 RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER,
1250
1251 RETRO_CAMERA_BUFFER_DUMMY = INT_MAX
1252};
1253
1254/* Starts the camera driver. Can only be called in retro_run(). */
1255typedef bool (*retro_camera_start_t)(void);
1256
1257/* Stops the camera driver. Can only be called in retro_run(). */
1258typedef void (*retro_camera_stop_t)(void);
1259
1260/* Callback which signals when the camera driver is initialized
1261 * and/or deinitialized.
1262 * retro_camera_start_t can be called in initialized callback.
1263 */
1264typedef void (*retro_camera_lifetime_status_t)(void);
1265
1266/* A callback for raw framebuffer data. buffer points to an XRGB8888 buffer.
1267 * Width, height and pitch are similar to retro_video_refresh_t.
1268 * First pixel is top-left origin.
1269 */
1270typedef void (*retro_camera_frame_raw_framebuffer_t)(const uint32_t *buffer,
1271 unsigned width, unsigned height, size_t pitch);
1272
1273/* A callback for when OpenGL textures are used.
1274 *
1275 * texture_id is a texture owned by camera driver.
1276 * Its state or content should be considered immutable, except for things like
1277 * texture filtering and clamping.
1278 *
1279 * texture_target is the texture target for the GL texture.
1280 * These can include e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE, and possibly
1281 * more depending on extensions.
1282 *
1283 * affine points to a packed 3x3 column-major matrix used to apply an affine
1284 * transform to texture coordinates. (affine_matrix * vec3(coord_x, coord_y, 1.0))
1285 * After transform, normalized texture coord (0, 0) should be bottom-left
1286 * and (1, 1) should be top-right (or (width, height) for RECTANGLE).
1287 *
1288 * GL-specific typedefs are avoided here to avoid relying on gl.h in
1289 * the API definition.
1290 */
1291typedef void (*retro_camera_frame_opengl_texture_t)(unsigned texture_id,
1292 unsigned texture_target, const float *affine);
1293
1294struct retro_camera_callback
1295{
1296 /* Set by libretro core.
1297 * Example bitmask: caps = (1 << RETRO_CAMERA_BUFFER_OPENGL_TEXTURE) | (1 << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER).
1298 */
1299 uint64_t caps;
1300
1301 unsigned width; /* Desired resolution for camera. Is only used as a hint. */
1302 unsigned height;
1303 retro_camera_start_t start; /* Set by frontend. */
1304 retro_camera_stop_t stop; /* Set by frontend. */
1305
1306 /* Set by libretro core if raw framebuffer callbacks will be used. */
1307 retro_camera_frame_raw_framebuffer_t frame_raw_framebuffer;
1308 /* Set by libretro core if OpenGL texture callbacks will be used. */
1309 retro_camera_frame_opengl_texture_t frame_opengl_texture;
1310
1311 /* Set by libretro core. Called after camera driver is initialized and
1312 * ready to be started.
1313 * Can be NULL, in which this callback is not called.
1314 */
1315 retro_camera_lifetime_status_t initialized;
1316
1317 /* Set by libretro core. Called right before camera driver is
1318 * deinitialized.
1319 * Can be NULL, in which this callback is not called.
1320 */
1321 retro_camera_lifetime_status_t deinitialized;
1322};
1323
1324/* Sets the interval of time and/or distance at which to update/poll
1325 * location-based data.
1326 *
1327 * To ensure compatibility with all location-based implementations,
1328 * values for both interval_ms and interval_distance should be provided.
1329 *
1330 * interval_ms is the interval expressed in milliseconds.
1331 * interval_distance is the distance interval expressed in meters.
1332 */
1333typedef void (*retro_location_set_interval_t)(unsigned interval_ms,
1334 unsigned interval_distance);
1335
1336/* Start location services. The device will start listening for changes to the
1337 * current location at regular intervals (which are defined with
1338 * retro_location_set_interval_t). */
1339typedef bool (*retro_location_start_t)(void);
1340
1341/* Stop location services. The device will stop listening for changes
1342 * to the current location. */
1343typedef void (*retro_location_stop_t)(void);
1344
1345/* Get the position of the current location. Will set parameters to
1346 * 0 if no new location update has happened since the last time. */
1347typedef bool (*retro_location_get_position_t)(double *lat, double *lon,
1348 double *horiz_accuracy, double *vert_accuracy);
1349
1350/* Callback which signals when the location driver is initialized
1351 * and/or deinitialized.
1352 * retro_location_start_t can be called in initialized callback.
1353 */
1354typedef void (*retro_location_lifetime_status_t)(void);
1355
1356struct retro_location_callback
1357{
1358 retro_location_start_t start;
1359 retro_location_stop_t stop;
1360 retro_location_get_position_t get_position;
1361 retro_location_set_interval_t set_interval;
1362
1363 retro_location_lifetime_status_t initialized;
1364 retro_location_lifetime_status_t deinitialized;
1365};
1366
1367enum retro_rumble_effect
1368{
1369 RETRO_RUMBLE_STRONG = 0,
1370 RETRO_RUMBLE_WEAK = 1,
1371
1372 RETRO_RUMBLE_DUMMY = INT_MAX
1373};
1374
1375/* Sets rumble state for joypad plugged in port 'port'.
1376 * Rumble effects are controlled independently,
1377 * and setting e.g. strong rumble does not override weak rumble.
1378 * Strength has a range of [0, 0xffff].
1379 *
1380 * Returns true if rumble state request was honored.
1381 * Calling this before first retro_run() is likely to return false. */
1382typedef bool (*retro_set_rumble_state_t)(unsigned port,
1383 enum retro_rumble_effect effect, uint16_t strength);
1384
1385struct retro_rumble_interface
1386{
1387 retro_set_rumble_state_t set_rumble_state;
1388};
1389
1390/* Notifies libretro that audio data should be written. */
1391typedef void (*retro_audio_callback_t)(void);
1392
1393/* True: Audio driver in frontend is active, and callback is
1394 * expected to be called regularily.
1395 * False: Audio driver in frontend is paused or inactive.
1396 * Audio callback will not be called until set_state has been
1397 * called with true.
1398 * Initial state is false (inactive).
1399 */
1400typedef void (*retro_audio_set_state_callback_t)(bool enabled);
1401
1402struct retro_audio_callback
1403{
1404 retro_audio_callback_t callback;
1405 retro_audio_set_state_callback_t set_state;
1406};
1407
1408/* Notifies a libretro core of time spent since last invocation
1409 * of retro_run() in microseconds.
1410 *
1411 * It will be called right before retro_run() every frame.
1412 * The frontend can tamper with timing to support cases like
1413 * fast-forward, slow-motion and framestepping.
1414 *
1415 * In those scenarios the reference frame time value will be used. */
1416typedef int64_t retro_usec_t;
1417typedef void (*retro_frame_time_callback_t)(retro_usec_t usec);
1418struct retro_frame_time_callback
1419{
1420 retro_frame_time_callback_t callback;
1421 /* Represents the time of one frame. It is computed as
1422 * 1000000 / fps, but the implementation will resolve the
1423 * rounding to ensure that framestepping, etc is exact. */
1424 retro_usec_t reference;
1425};
1426
1427/* Pass this to retro_video_refresh_t if rendering to hardware.
1428 * Passing NULL to retro_video_refresh_t is still a frame dupe as normal.
1429 * */
1430#define RETRO_HW_FRAME_BUFFER_VALID ((void*)-1)
1431
1432/* Invalidates the current HW context.
1433 * Any GL state is lost, and must not be deinitialized explicitly.
1434 * If explicit deinitialization is desired by the libretro core,
1435 * it should implement context_destroy callback.
1436 * If called, all GPU resources must be reinitialized.
1437 * Usually called when frontend reinits video driver.
1438 * Also called first time video driver is initialized,
1439 * allowing libretro core to initialize resources.
1440 */
1441typedef void (*retro_hw_context_reset_t)(void);
1442
1443/* Gets current framebuffer which is to be rendered to.
1444 * Could change every frame potentially.
1445 */
1446typedef uintptr_t (*retro_hw_get_current_framebuffer_t)(void);
1447
1448/* Get a symbol from HW context. */
1449typedef retro_proc_address_t (*retro_hw_get_proc_address_t)(const char *sym);
1450
1451enum retro_hw_context_type
1452{
1453 RETRO_HW_CONTEXT_NONE = 0,
1454 /* OpenGL 2.x. Driver can choose to use latest compatibility context. */
1455 RETRO_HW_CONTEXT_OPENGL = 1,
1456 /* OpenGL ES 2.0. */
1457 RETRO_HW_CONTEXT_OPENGLES2 = 2,
1458 /* Modern desktop core GL context. Use version_major/
1459 * version_minor fields to set GL version. */
1460 RETRO_HW_CONTEXT_OPENGL_CORE = 3,
1461 /* OpenGL ES 3.0 */
1462 RETRO_HW_CONTEXT_OPENGLES3 = 4,
1463 /* OpenGL ES 3.1+. Set version_major/version_minor. For GLES2 and GLES3,
1464 * use the corresponding enums directly. */
1465 RETRO_HW_CONTEXT_OPENGLES_VERSION = 5,
1466
1467 RETRO_HW_CONTEXT_DUMMY = INT_MAX
1468};
1469
1470struct retro_hw_render_callback
1471{
1472 /* Which API to use. Set by libretro core. */
1473 enum retro_hw_context_type context_type;
1474
1475 /* Called when a context has been created or when it has been reset.
1476 * An OpenGL context is only valid after context_reset() has been called.
1477 *
1478 * When context_reset is called, OpenGL resources in the libretro
1479 * implementation are guaranteed to be invalid.
1480 *
1481 * It is possible that context_reset is called multiple times during an
1482 * application lifecycle.
1483 * If context_reset is called without any notification (context_destroy),
1484 * the OpenGL context was lost and resources should just be recreated
1485 * without any attempt to "free" old resources.
1486 */
1487 retro_hw_context_reset_t context_reset;
1488
1489 /* Set by frontend. */
1490 retro_hw_get_current_framebuffer_t get_current_framebuffer;
1491
1492 /* Set by frontend. */
1493 retro_hw_get_proc_address_t get_proc_address;
1494
1495 /* Set if render buffers should have depth component attached. */
1496 bool depth;
1497
1498 /* Set if stencil buffers should be attached. */
1499 bool stencil;
1500
1501 /* If depth and stencil are true, a packed 24/8 buffer will be added.
1502 * Only attaching stencil is invalid and will be ignored. */
1503
1504 /* Use conventional bottom-left origin convention. If false,
1505 * standard libretro top-left origin semantics are used. */
1506 bool bottom_left_origin;
1507
1508 /* Major version number for core GL context or GLES 3.1+. */
1509 unsigned version_major;
1510
1511 /* Minor version number for core GL context or GLES 3.1+. */
1512 unsigned version_minor;
1513
1514 /* If this is true, the frontend will go very far to avoid
1515 * resetting context in scenarios like toggling fullscreen, etc.
1516 */
1517 bool cache_context;
1518
1519 /* The reset callback might still be called in extreme situations
1520 * such as if the context is lost beyond recovery.
1521 *
1522 * For optimal stability, set this to false, and allow context to be
1523 * reset at any time.
1524 */
1525
1526 /* A callback to be called before the context is destroyed in a
1527 * controlled way by the frontend. */
1528 retro_hw_context_reset_t context_destroy;
1529
1530 /* OpenGL resources can be deinitialized cleanly at this step.
1531 * context_destroy can be set to NULL, in which resources will
1532 * just be destroyed without any notification.
1533 *
1534 * Even when context_destroy is non-NULL, it is possible that
1535 * context_reset is called without any destroy notification.
1536 * This happens if context is lost by external factors (such as
1537 * notified by GL_ARB_robustness).
1538 *
1539 * In this case, the context is assumed to be already dead,
1540 * and the libretro implementation must not try to free any OpenGL
1541 * resources in the subsequent context_reset.
1542 */
1543
1544 /* Creates a debug context. */
1545 bool debug_context;
1546};
1547
1548/* Callback type passed in RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK.
1549 * Called by the frontend in response to keyboard events.
1550 * down is set if the key is being pressed, or false if it is being released.
1551 * keycode is the RETROK value of the char.
1552 * character is the text character of the pressed key. (UTF-32).
1553 * key_modifiers is a set of RETROKMOD values or'ed together.
1554 *
1555 * The pressed/keycode state can be indepedent of the character.
1556 * It is also possible that multiple characters are generated from a
1557 * single keypress.
1558 * Keycode events should be treated separately from character events.
1559 * However, when possible, the frontend should try to synchronize these.
1560 * If only a character is posted, keycode should be RETROK_UNKNOWN.
1561 *
1562 * Similarily if only a keycode event is generated with no corresponding
1563 * character, character should be 0.
1564 */
1565typedef void (*retro_keyboard_event_t)(bool down, unsigned keycode,
1566 uint32_t character, uint16_t key_modifiers);
1567
1568struct retro_keyboard_callback
1569{
1570 retro_keyboard_event_t callback;
1571};
1572
1573/* Callbacks for RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE.
1574 * Should be set for implementations which can swap out multiple disk
1575 * images in runtime.
1576 *
1577 * If the implementation can do this automatically, it should strive to do so.
1578 * However, there are cases where the user must manually do so.
1579 *
1580 * Overview: To swap a disk image, eject the disk image with
1581 * set_eject_state(true).
1582 * Set the disk index with set_image_index(index). Insert the disk again
1583 * with set_eject_state(false).
1584 */
1585
1586/* If ejected is true, "ejects" the virtual disk tray.
1587 * When ejected, the disk image index can be set.
1588 */
1589typedef bool (*retro_set_eject_state_t)(bool ejected);
1590
1591/* Gets current eject state. The initial state is 'not ejected'. */
1592typedef bool (*retro_get_eject_state_t)(void);
1593
1594/* Gets current disk index. First disk is index 0.
1595 * If return value is >= get_num_images(), no disk is currently inserted.
1596 */
1597typedef unsigned (*retro_get_image_index_t)(void);
1598
1599/* Sets image index. Can only be called when disk is ejected.
1600 * The implementation supports setting "no disk" by using an
1601 * index >= get_num_images().
1602 */
1603typedef bool (*retro_set_image_index_t)(unsigned index);
1604
1605/* Gets total number of images which are available to use. */
1606typedef unsigned (*retro_get_num_images_t)(void);
1607
1608struct retro_game_info;
1609
1610/* Replaces the disk image associated with index.
1611 * Arguments to pass in info have same requirements as retro_load_game().
1612 * Virtual disk tray must be ejected when calling this.
1613 *
1614 * Replacing a disk image with info = NULL will remove the disk image
1615 * from the internal list.
1616 * As a result, calls to get_image_index() can change.
1617 *
1618 * E.g. replace_image_index(1, NULL), and previous get_image_index()
1619 * returned 4 before.
1620 * Index 1 will be removed, and the new index is 3.
1621 */
1622typedef bool (*retro_replace_image_index_t)(unsigned index,
1623 const struct retro_game_info *info);
1624
1625/* Adds a new valid index (get_num_images()) to the internal disk list.
1626 * This will increment subsequent return values from get_num_images() by 1.
1627 * This image index cannot be used until a disk image has been set
1628 * with replace_image_index. */
1629typedef bool (*retro_add_image_index_t)(void);
1630
1631struct retro_disk_control_callback
1632{
1633 retro_set_eject_state_t set_eject_state;
1634 retro_get_eject_state_t get_eject_state;
1635
1636 retro_get_image_index_t get_image_index;
1637 retro_set_image_index_t set_image_index;
1638 retro_get_num_images_t get_num_images;
1639
1640 retro_replace_image_index_t replace_image_index;
1641 retro_add_image_index_t add_image_index;
1642};
1643
1644enum retro_pixel_format
1645{
1646 /* 0RGB1555, native endian.
1647 * 0 bit must be set to 0.
1648 * This pixel format is default for compatibility concerns only.
1649 * If a 15/16-bit pixel format is desired, consider using RGB565. */
1650 RETRO_PIXEL_FORMAT_0RGB1555 = 0,
1651
1652 /* XRGB8888, native endian.
1653 * X bits are ignored. */
1654 RETRO_PIXEL_FORMAT_XRGB8888 = 1,
1655
1656 /* RGB565, native endian.
1657 * This pixel format is the recommended format to use if a 15/16-bit
1658 * format is desired as it is the pixel format that is typically
1659 * available on a wide range of low-power devices.
1660 *
1661 * It is also natively supported in APIs like OpenGL ES. */
1662 RETRO_PIXEL_FORMAT_RGB565 = 2,
1663
1664 /* Ensure sizeof() == sizeof(int). */
1665 RETRO_PIXEL_FORMAT_UNKNOWN = INT_MAX
1666};
1667
1668struct retro_message
1669{
1670 const char *msg; /* Message to be displayed. */
1671 unsigned frames; /* Duration in frames of message. */
1672};
1673
1674/* Describes how the libretro implementation maps a libretro input bind
1675 * to its internal input system through a human readable string.
1676 * This string can be used to better let a user configure input. */
1677struct retro_input_descriptor
1678{
1679 /* Associates given parameters with a description. */
1680 unsigned port;
1681 unsigned device;
1682 unsigned index;
1683 unsigned id;
1684
1685 /* Human readable description for parameters.
1686 * The pointer must remain valid until
1687 * retro_unload_game() is called. */
1688 const char *description;
1689};
1690
1691struct retro_system_info
1692{
1693 /* All pointers are owned by libretro implementation, and pointers must
1694 * remain valid until retro_deinit() is called. */
1695
1696 const char *library_name; /* Descriptive name of library. Should not
1697 * contain any version numbers, etc. */
1698 const char *library_version; /* Descriptive version of core. */
1699
1700 const char *valid_extensions; /* A string listing probably content
1701 * extensions the core will be able to
1702 * load, separated with pipe.
1703 * I.e. "bin|rom|iso".
1704 * Typically used for a GUI to filter
1705 * out extensions. */
1706
1707 /* If true, retro_load_game() is guaranteed to provide a valid pathname
1708 * in retro_game_info::path.
1709 * ::data and ::size are both invalid.
1710 *
1711 * If false, ::data and ::size are guaranteed to be valid, but ::path
1712 * might not be valid.
1713 *
1714 * This is typically set to true for libretro implementations that must
1715 * load from file.
1716 * Implementations should strive for setting this to false, as it allows
1717 * the frontend to perform patching, etc. */
1718 bool need_fullpath;
1719
1720 /* If true, the frontend is not allowed to extract any archives before
1721 * loading the real content.
1722 * Necessary for certain libretro implementations that load games
1723 * from zipped archives. */
1724 bool block_extract;
1725};
1726
1727struct retro_game_geometry
1728{
1729 unsigned base_width; /* Nominal video width of game. */
1730 unsigned base_height; /* Nominal video height of game. */
1731 unsigned max_width; /* Maximum possible width of game. */
1732 unsigned max_height; /* Maximum possible height of game. */
1733
1734 float aspect_ratio; /* Nominal aspect ratio of game. If
1735 * aspect_ratio is <= 0.0, an aspect ratio
1736 * of base_width / base_height is assumed.
1737 * A frontend could override this setting,
1738 * if desired. */
1739};
1740
1741struct retro_system_timing
1742{
1743 double fps; /* FPS of video content. */
1744 double sample_rate; /* Sampling rate of audio. */
1745};
1746
1747struct retro_system_av_info
1748{
1749 struct retro_game_geometry geometry;
1750 struct retro_system_timing timing;
1751};
1752
1753struct retro_variable
1754{
1755 /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE.
1756 * If NULL, obtains the complete environment string if more
1757 * complex parsing is necessary.
1758 * The environment string is formatted as key-value pairs
1759 * delimited by semicolons as so:
1760 * "key1=value1;key2=value2;..."
1761 */
1762 const char *key;
1763
1764 /* Value to be obtained. If key does not exist, it is set to NULL. */
1765 const char *value;
1766};
1767
1768struct retro_game_info
1769{
1770 const char *path; /* Path to game, UTF-8 encoded.
1771 * Usually used as a reference.
1772 * May be NULL if rom was loaded from stdin
1773 * or similar.
1774 * retro_system_info::need_fullpath guaranteed
1775 * that this path is valid. */
1776 const void *data; /* Memory buffer of loaded game. Will be NULL
1777 * if need_fullpath was set. */
1778 size_t size; /* Size of memory buffer. */
1779 const char *meta; /* String of implementation specific meta-data. */
1780};
1781
1782/* Callbacks */
1783
1784/* Environment callback. Gives implementations a way of performing
1785 * uncommon tasks. Extensible. */
1786typedef bool (*retro_environment_t)(unsigned cmd, void *data);
1787
1788/* Render a frame. Pixel format is 15-bit 0RGB1555 native endian
1789 * unless changed (see RETRO_ENVIRONMENT_SET_PIXEL_FORMAT).
1790 *
1791 * Width and height specify dimensions of buffer.
1792 * Pitch specifices length in bytes between two lines in buffer.
1793 *
1794 * For performance reasons, it is highly recommended to have a frame
1795 * that is packed in memory, i.e. pitch == width * byte_per_pixel.
1796 * Certain graphic APIs, such as OpenGL ES, do not like textures
1797 * that are not packed in memory.
1798 */
1799typedef void (*retro_video_refresh_t)(const void *data, unsigned width,
1800 unsigned height, size_t pitch);
1801
1802/* Renders a single audio frame. Should only be used if implementation
1803 * generates a single sample at a time.
1804 * Format is signed 16-bit native endian.
1805 */
1806typedef void (*retro_audio_sample_t)(int16_t left, int16_t right);
1807
1808/* Renders multiple audio frames in one go.
1809 *
1810 * One frame is defined as a sample of left and right channels, interleaved.
1811 * I.e. int16_t buf[4] = { l, r, l, r }; would be 2 frames.
1812 * Only one of the audio callbacks must ever be used.
1813 */
1814typedef size_t (*retro_audio_sample_batch_t)(const int16_t *data,
1815 size_t frames);
1816
1817/* Polls input. */
1818typedef void (*retro_input_poll_t)(void);
1819
1820/* Queries for input for player 'port'. device will be masked with
1821 * RETRO_DEVICE_MASK.
1822 *
1823 * Specialization of devices such as RETRO_DEVICE_JOYPAD_MULTITAP that
1824 * have been set with retro_set_controller_port_device()
1825 * will still use the higher level RETRO_DEVICE_JOYPAD to request input.
1826 */
1827typedef int16_t (*retro_input_state_t)(unsigned port, unsigned device,
1828 unsigned index, unsigned id);
1829
1830/* Sets callbacks. retro_set_environment() is guaranteed to be called
1831 * before retro_init().
1832 *
1833 * The rest of the set_* functions are guaranteed to have been called
1834 * before the first call to retro_run() is made. */
1835void retro_set_environment(retro_environment_t);
1836void retro_set_video_refresh(retro_video_refresh_t);
1837void retro_set_audio_sample(retro_audio_sample_t);
1838void retro_set_audio_sample_batch(retro_audio_sample_batch_t);
1839void retro_set_input_poll(retro_input_poll_t);
1840void retro_set_input_state(retro_input_state_t);
1841
1842/* Library global initialization/deinitialization. */
1843void retro_init(void);
1844void retro_deinit(void);
1845
1846/* Must return RETRO_API_VERSION. Used to validate ABI compatibility
1847 * when the API is revised. */
1848unsigned retro_api_version(void);
1849
1850/* Gets statically known system info. Pointers provided in *info
1851 * must be statically allocated.
1852 * Can be called at any time, even before retro_init(). */
1853void retro_get_system_info(struct retro_system_info *info);
1854
1855/* Gets information about system audio/video timings and geometry.
1856 * Can be called only after retro_load_game() has successfully completed.
1857 * NOTE: The implementation of this function might not initialize every
1858 * variable if needed.
1859 * E.g. geom.aspect_ratio might not be initialized if core doesn't
1860 * desire a particular aspect ratio. */
1861void retro_get_system_av_info(struct retro_system_av_info *info);
1862
1863/* Sets device to be used for player 'port'.
1864 * By default, RETRO_DEVICE_JOYPAD is assumed to be plugged into all
1865 * available ports.
1866 * Setting a particular device type is not a guarantee that libretro cores
1867 * will only poll input based on that particular device type. It is only a
1868 * hint to the libretro core when a core cannot automatically detect the
1869 * appropriate input device type on its own. It is also relevant when a
1870 * core can change its behavior depending on device type. */
1871void retro_set_controller_port_device(unsigned port, unsigned device);
1872
1873/* Resets the current game. */
1874void retro_reset(void);
1875
1876/* Runs the game for one video frame.
1877 * During retro_run(), input_poll callback must be called at least once.
1878 *
1879 * If a frame is not rendered for reasons where a game "dropped" a frame,
1880 * this still counts as a frame, and retro_run() should explicitly dupe
1881 * a frame if GET_CAN_DUPE returns true.
1882 * In this case, the video callback can take a NULL argument for data.
1883 */
1884void retro_run(void);
1885
1886/* Returns the amount of data the implementation requires to serialize
1887 * internal state (save states).
1888 * Between calls to retro_load_game() and retro_unload_game(), the
1889 * returned size is never allowed to be larger than a previous returned
1890 * value, to ensure that the frontend can allocate a save state buffer once.
1891 */
1892size_t retro_serialize_size(void);
1893
1894/* Serializes internal state. If failed, or size is lower than
1895 * retro_serialize_size(), it should return false, true otherwise. */
1896bool retro_serialize(void *data, size_t size);
1897bool retro_unserialize(const void *data, size_t size);
1898
1899void retro_cheat_reset(void);
1900void retro_cheat_set(unsigned index, bool enabled, const char *code);
1901
1902/* Loads a game. */
1903bool retro_load_game(const struct retro_game_info *game);
1904
1905/* Loads a "special" kind of game. Should not be used,
1906 * except in extreme cases. */
1907bool retro_load_game_special(
1908 unsigned game_type,
1909 const struct retro_game_info *info, size_t num_info
1910);
1911
1912/* Unloads a currently loaded game. */
1913void retro_unload_game(void);
1914
1915/* Gets region of game. */
1916unsigned retro_get_region(void);
1917
1918/* Gets region of memory. */
1919void *retro_get_memory_data(unsigned id);
1920size_t retro_get_memory_size(unsigned id);
1921
1922#ifdef __cplusplus
1923}
1924#endif
1925
1926#endif
ARM optimized PCSX fork