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1/* Copyright (C) 2010-2016 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#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 X/Y coordinates are reported relatively to last poll,
130 * similar to mouse. */
131#define RETRO_DEVICE_LIGHTGUN 4
132
133/* The ANALOG device is an extension to JOYPAD (RetroPad).
134 * Similar to DualShock it adds two analog sticks.
135 * This is treated as a separate device type as it returns values in the
136 * full analog range of [-0x8000, 0x7fff]. Positive X axis is right.
137 * Positive Y axis is down.
138 * Only use ANALOG type when polling for analog values of the axes.
139 */
140#define RETRO_DEVICE_ANALOG 5
141
142/* Abstracts the concept of a pointing mechanism, e.g. touch.
143 * This allows libretro to query in absolute coordinates where on the
144 * screen a mouse (or something similar) is being placed.
145 * For a touch centric device, coordinates reported are the coordinates
146 * of the press.
147 *
148 * Coordinates in X and Y are reported as:
149 * [-0x7fff, 0x7fff]: -0x7fff corresponds to the far left/top of the screen,
150 * and 0x7fff corresponds to the far right/bottom of the screen.
151 * The "screen" is here defined as area that is passed to the frontend and
152 * later displayed on the monitor.
153 *
154 * The frontend is free to scale/resize this screen as it sees fit, however,
155 * (X, Y) = (-0x7fff, -0x7fff) will correspond to the top-left pixel of the
156 * game image, etc.
157 *
158 * To check if the pointer coordinates are valid (e.g. a touch display
159 * actually being touched), PRESSED returns 1 or 0.
160 *
161 * If using a mouse on a desktop, PRESSED will usually correspond to the
162 * left mouse button, but this is a frontend decision.
163 * PRESSED will only return 1 if the pointer is inside the game screen.
164 *
165 * For multi-touch, the index variable can be used to successively query
166 * more presses.
167 * If index = 0 returns true for _PRESSED, coordinates can be extracted
168 * with _X, _Y for index = 0. One can then query _PRESSED, _X, _Y with
169 * index = 1, and so on.
170 * Eventually _PRESSED will return false for an index. No further presses
171 * are registered at this point. */
172#define RETRO_DEVICE_POINTER 6
173
174/* Buttons for the RetroPad (JOYPAD).
175 * The placement of these is equivalent to placements on the
176 * Super Nintendo controller.
177 * L2/R2/L3/R3 buttons correspond to the PS1 DualShock. */
178#define RETRO_DEVICE_ID_JOYPAD_B 0
179#define RETRO_DEVICE_ID_JOYPAD_Y 1
180#define RETRO_DEVICE_ID_JOYPAD_SELECT 2
181#define RETRO_DEVICE_ID_JOYPAD_START 3
182#define RETRO_DEVICE_ID_JOYPAD_UP 4
183#define RETRO_DEVICE_ID_JOYPAD_DOWN 5
184#define RETRO_DEVICE_ID_JOYPAD_LEFT 6
185#define RETRO_DEVICE_ID_JOYPAD_RIGHT 7
186#define RETRO_DEVICE_ID_JOYPAD_A 8
187#define RETRO_DEVICE_ID_JOYPAD_X 9
188#define RETRO_DEVICE_ID_JOYPAD_L 10
189#define RETRO_DEVICE_ID_JOYPAD_R 11
190#define RETRO_DEVICE_ID_JOYPAD_L2 12
191#define RETRO_DEVICE_ID_JOYPAD_R2 13
192#define RETRO_DEVICE_ID_JOYPAD_L3 14
193#define RETRO_DEVICE_ID_JOYPAD_R3 15
194
195/* Index / Id values for ANALOG device. */
196#define RETRO_DEVICE_INDEX_ANALOG_LEFT 0
197#define RETRO_DEVICE_INDEX_ANALOG_RIGHT 1
198#define RETRO_DEVICE_INDEX_ANALOG_BUTTON 2
199#define RETRO_DEVICE_ID_ANALOG_X 0
200#define RETRO_DEVICE_ID_ANALOG_Y 1
201
202/* Id values for MOUSE. */
203#define RETRO_DEVICE_ID_MOUSE_X 0
204#define RETRO_DEVICE_ID_MOUSE_Y 1
205#define RETRO_DEVICE_ID_MOUSE_LEFT 2
206#define RETRO_DEVICE_ID_MOUSE_RIGHT 3
207#define RETRO_DEVICE_ID_MOUSE_WHEELUP 4
208#define RETRO_DEVICE_ID_MOUSE_WHEELDOWN 5
209#define RETRO_DEVICE_ID_MOUSE_MIDDLE 6
210#define RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELUP 7
211#define RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELDOWN 8
212
213/* Id values for LIGHTGUN types. */
214#define RETRO_DEVICE_ID_LIGHTGUN_X 0
215#define RETRO_DEVICE_ID_LIGHTGUN_Y 1
216#define RETRO_DEVICE_ID_LIGHTGUN_TRIGGER 2
217#define RETRO_DEVICE_ID_LIGHTGUN_CURSOR 3
218#define RETRO_DEVICE_ID_LIGHTGUN_TURBO 4
219#define RETRO_DEVICE_ID_LIGHTGUN_PAUSE 5
220#define RETRO_DEVICE_ID_LIGHTGUN_START 6
221
222/* Id values for POINTER. */
223#define RETRO_DEVICE_ID_POINTER_X 0
224#define RETRO_DEVICE_ID_POINTER_Y 1
225#define RETRO_DEVICE_ID_POINTER_PRESSED 2
226
227/* Returned from retro_get_region(). */
228#define RETRO_REGION_NTSC 0
229#define RETRO_REGION_PAL 1
230
231/* Id values for LANGUAGE */
232enum retro_language
233{
234 RETRO_LANGUAGE_ENGLISH = 0,
235 RETRO_LANGUAGE_JAPANESE = 1,
236 RETRO_LANGUAGE_FRENCH = 2,
237 RETRO_LANGUAGE_SPANISH = 3,
238 RETRO_LANGUAGE_GERMAN = 4,
239 RETRO_LANGUAGE_ITALIAN = 5,
240 RETRO_LANGUAGE_DUTCH = 6,
241 RETRO_LANGUAGE_PORTUGUESE = 7,
242 RETRO_LANGUAGE_RUSSIAN = 8,
243 RETRO_LANGUAGE_KOREAN = 9,
244 RETRO_LANGUAGE_CHINESE_TRADITIONAL = 10,
245 RETRO_LANGUAGE_CHINESE_SIMPLIFIED = 11,
246 RETRO_LANGUAGE_ESPERANTO = 12,
247 RETRO_LANGUAGE_POLISH = 13,
248 RETRO_LANGUAGE_LAST,
249
250 /* Ensure sizeof(enum) == sizeof(int) */
251 RETRO_LANGUAGE_DUMMY = INT_MAX
252};
253
254/* Passed to retro_get_memory_data/size().
255 * If the memory type doesn't apply to the
256 * implementation NULL/0 can be returned.
257 */
258#define RETRO_MEMORY_MASK 0xff
259
260/* Regular save RAM. This RAM is usually found on a game cartridge,
261 * backed up by a battery.
262 * If save game data is too complex for a single memory buffer,
263 * the SAVE_DIRECTORY (preferably) or SYSTEM_DIRECTORY environment
264 * callback can be used. */
265#define RETRO_MEMORY_SAVE_RAM 0
266
267/* Some games have a built-in clock to keep track of time.
268 * This memory is usually just a couple of bytes to keep track of time.
269 */
270#define RETRO_MEMORY_RTC 1
271
272/* System ram lets a frontend peek into a game systems main RAM. */
273#define RETRO_MEMORY_SYSTEM_RAM 2
274
275/* Video ram lets a frontend peek into a game systems video RAM (VRAM). */
276#define RETRO_MEMORY_VIDEO_RAM 3
277
278/* Keysyms used for ID in input state callback when polling RETRO_KEYBOARD. */
279enum retro_key
280{
281 RETROK_UNKNOWN = 0,
282 RETROK_FIRST = 0,
283 RETROK_BACKSPACE = 8,
284 RETROK_TAB = 9,
285 RETROK_CLEAR = 12,
286 RETROK_RETURN = 13,
287 RETROK_PAUSE = 19,
288 RETROK_ESCAPE = 27,
289 RETROK_SPACE = 32,
290 RETROK_EXCLAIM = 33,
291 RETROK_QUOTEDBL = 34,
292 RETROK_HASH = 35,
293 RETROK_DOLLAR = 36,
294 RETROK_AMPERSAND = 38,
295 RETROK_QUOTE = 39,
296 RETROK_LEFTPAREN = 40,
297 RETROK_RIGHTPAREN = 41,
298 RETROK_ASTERISK = 42,
299 RETROK_PLUS = 43,
300 RETROK_COMMA = 44,
301 RETROK_MINUS = 45,
302 RETROK_PERIOD = 46,
303 RETROK_SLASH = 47,
304 RETROK_0 = 48,
305 RETROK_1 = 49,
306 RETROK_2 = 50,
307 RETROK_3 = 51,
308 RETROK_4 = 52,
309 RETROK_5 = 53,
310 RETROK_6 = 54,
311 RETROK_7 = 55,
312 RETROK_8 = 56,
313 RETROK_9 = 57,
314 RETROK_COLON = 58,
315 RETROK_SEMICOLON = 59,
316 RETROK_LESS = 60,
317 RETROK_EQUALS = 61,
318 RETROK_GREATER = 62,
319 RETROK_QUESTION = 63,
320 RETROK_AT = 64,
321 RETROK_LEFTBRACKET = 91,
322 RETROK_BACKSLASH = 92,
323 RETROK_RIGHTBRACKET = 93,
324 RETROK_CARET = 94,
325 RETROK_UNDERSCORE = 95,
326 RETROK_BACKQUOTE = 96,
327 RETROK_a = 97,
328 RETROK_b = 98,
329 RETROK_c = 99,
330 RETROK_d = 100,
331 RETROK_e = 101,
332 RETROK_f = 102,
333 RETROK_g = 103,
334 RETROK_h = 104,
335 RETROK_i = 105,
336 RETROK_j = 106,
337 RETROK_k = 107,
338 RETROK_l = 108,
339 RETROK_m = 109,
340 RETROK_n = 110,
341 RETROK_o = 111,
342 RETROK_p = 112,
343 RETROK_q = 113,
344 RETROK_r = 114,
345 RETROK_s = 115,
346 RETROK_t = 116,
347 RETROK_u = 117,
348 RETROK_v = 118,
349 RETROK_w = 119,
350 RETROK_x = 120,
351 RETROK_y = 121,
352 RETROK_z = 122,
353 RETROK_DELETE = 127,
354
355 RETROK_KP0 = 256,
356 RETROK_KP1 = 257,
357 RETROK_KP2 = 258,
358 RETROK_KP3 = 259,
359 RETROK_KP4 = 260,
360 RETROK_KP5 = 261,
361 RETROK_KP6 = 262,
362 RETROK_KP7 = 263,
363 RETROK_KP8 = 264,
364 RETROK_KP9 = 265,
365 RETROK_KP_PERIOD = 266,
366 RETROK_KP_DIVIDE = 267,
367 RETROK_KP_MULTIPLY = 268,
368 RETROK_KP_MINUS = 269,
369 RETROK_KP_PLUS = 270,
370 RETROK_KP_ENTER = 271,
371 RETROK_KP_EQUALS = 272,
372
373 RETROK_UP = 273,
374 RETROK_DOWN = 274,
375 RETROK_RIGHT = 275,
376 RETROK_LEFT = 276,
377 RETROK_INSERT = 277,
378 RETROK_HOME = 278,
379 RETROK_END = 279,
380 RETROK_PAGEUP = 280,
381 RETROK_PAGEDOWN = 281,
382
383 RETROK_F1 = 282,
384 RETROK_F2 = 283,
385 RETROK_F3 = 284,
386 RETROK_F4 = 285,
387 RETROK_F5 = 286,
388 RETROK_F6 = 287,
389 RETROK_F7 = 288,
390 RETROK_F8 = 289,
391 RETROK_F9 = 290,
392 RETROK_F10 = 291,
393 RETROK_F11 = 292,
394 RETROK_F12 = 293,
395 RETROK_F13 = 294,
396 RETROK_F14 = 295,
397 RETROK_F15 = 296,
398
399 RETROK_NUMLOCK = 300,
400 RETROK_CAPSLOCK = 301,
401 RETROK_SCROLLOCK = 302,
402 RETROK_RSHIFT = 303,
403 RETROK_LSHIFT = 304,
404 RETROK_RCTRL = 305,
405 RETROK_LCTRL = 306,
406 RETROK_RALT = 307,
407 RETROK_LALT = 308,
408 RETROK_RMETA = 309,
409 RETROK_LMETA = 310,
410 RETROK_LSUPER = 311,
411 RETROK_RSUPER = 312,
412 RETROK_MODE = 313,
413 RETROK_COMPOSE = 314,
414
415 RETROK_HELP = 315,
416 RETROK_PRINT = 316,
417 RETROK_SYSREQ = 317,
418 RETROK_BREAK = 318,
419 RETROK_MENU = 319,
420 RETROK_POWER = 320,
421 RETROK_EURO = 321,
422 RETROK_UNDO = 322,
423
424 RETROK_LAST,
425
426 RETROK_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
427};
428
429enum retro_mod
430{
431 RETROKMOD_NONE = 0x0000,
432
433 RETROKMOD_SHIFT = 0x01,
434 RETROKMOD_CTRL = 0x02,
435 RETROKMOD_ALT = 0x04,
436 RETROKMOD_META = 0x08,
437
438 RETROKMOD_NUMLOCK = 0x10,
439 RETROKMOD_CAPSLOCK = 0x20,
440 RETROKMOD_SCROLLOCK = 0x40,
441
442 RETROKMOD_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */
443};
444
445/* If set, this call is not part of the public libretro API yet. It can
446 * change or be removed at any time. */
447#define RETRO_ENVIRONMENT_EXPERIMENTAL 0x10000
448/* Environment callback to be used internally in frontend. */
449#define RETRO_ENVIRONMENT_PRIVATE 0x20000
450
451/* Environment commands. */
452#define RETRO_ENVIRONMENT_SET_ROTATION 1 /* const unsigned * --
453 * Sets screen rotation of graphics.
454 * Is only implemented if rotation can be accelerated by hardware.
455 * Valid values are 0, 1, 2, 3, which rotates screen by 0, 90, 180,
456 * 270 degrees counter-clockwise respectively.
457 */
458#define RETRO_ENVIRONMENT_GET_OVERSCAN 2 /* bool * --
459 * Boolean value whether or not the implementation should use overscan,
460 * or crop away overscan.
461 */
462#define RETRO_ENVIRONMENT_GET_CAN_DUPE 3 /* bool * --
463 * Boolean value whether or not frontend supports frame duping,
464 * passing NULL to video frame callback.
465 */
466
467 /* Environ 4, 5 are no longer supported (GET_VARIABLE / SET_VARIABLES),
468 * and reserved to avoid possible ABI clash.
469 */
470
471#define RETRO_ENVIRONMENT_SET_MESSAGE 6 /* const struct retro_message * --
472 * Sets a message to be displayed in implementation-specific manner
473 * for a certain amount of 'frames'.
474 * Should not be used for trivial messages, which should simply be
475 * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a
476 * fallback, stderr).
477 */
478#define RETRO_ENVIRONMENT_SHUTDOWN 7 /* N/A (NULL) --
479 * Requests the frontend to shutdown.
480 * Should only be used if game has a specific
481 * way to shutdown the game from a menu item or similar.
482 */
483#define RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL 8
484 /* const unsigned * --
485 * Gives a hint to the frontend how demanding this implementation
486 * is on a system. E.g. reporting a level of 2 means
487 * this implementation should run decently on all frontends
488 * of level 2 and up.
489 *
490 * It can be used by the frontend to potentially warn
491 * about too demanding implementations.
492 *
493 * The levels are "floating".
494 *
495 * This function can be called on a per-game basis,
496 * as certain games an implementation can play might be
497 * particularly demanding.
498 * If called, it should be called in retro_load_game().
499 */
500#define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9
501 /* const char ** --
502 * Returns the "system" directory of the frontend.
503 * This directory can be used to store system specific
504 * content such as BIOSes, configuration data, etc.
505 * The returned value can be NULL.
506 * If so, no such directory is defined,
507 * and it's up to the implementation to find a suitable directory.
508 *
509 * NOTE: Some cores used this folder also for "save" data such as
510 * memory cards, etc, for lack of a better place to put it.
511 * This is now discouraged, and if possible, cores should try to
512 * use the new GET_SAVE_DIRECTORY.
513 */
514#define RETRO_ENVIRONMENT_SET_PIXEL_FORMAT 10
515 /* const enum retro_pixel_format * --
516 * Sets the internal pixel format used by the implementation.
517 * The default pixel format is RETRO_PIXEL_FORMAT_0RGB1555.
518 * This pixel format however, is deprecated (see enum retro_pixel_format).
519 * If the call returns false, the frontend does not support this pixel
520 * format.
521 *
522 * This function should be called inside retro_load_game() or
523 * retro_get_system_av_info().
524 */
525#define RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS 11
526 /* const struct retro_input_descriptor * --
527 * Sets an array of retro_input_descriptors.
528 * It is up to the frontend to present this in a usable way.
529 * The array is terminated by retro_input_descriptor::description
530 * being set to NULL.
531 * This function can be called at any time, but it is recommended
532 * to call it as early as possible.
533 */
534#define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12
535 /* const struct retro_keyboard_callback * --
536 * Sets a callback function used to notify core about keyboard events.
537 */
538#define RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE 13
539 /* const struct retro_disk_control_callback * --
540 * Sets an interface which frontend can use to eject and insert
541 * disk images.
542 * This is used for games which consist of multiple images and
543 * must be manually swapped out by the user (e.g. PSX).
544 */
545#define RETRO_ENVIRONMENT_SET_HW_RENDER 14
546 /* struct retro_hw_render_callback * --
547 * Sets an interface to let a libretro core render with
548 * hardware acceleration.
549 * Should be called in retro_load_game().
550 * If successful, libretro cores will be able to render to a
551 * frontend-provided framebuffer.
552 * The size of this framebuffer will be at least as large as
553 * max_width/max_height provided in get_av_info().
554 * If HW rendering is used, pass only RETRO_HW_FRAME_BUFFER_VALID or
555 * NULL to retro_video_refresh_t.
556 */
557#define RETRO_ENVIRONMENT_GET_VARIABLE 15
558 /* struct retro_variable * --
559 * Interface to acquire user-defined information from environment
560 * that cannot feasibly be supported in a multi-system way.
561 * 'key' should be set to a key which has already been set by
562 * SET_VARIABLES.
563 * 'data' will be set to a value or NULL.
564 */
565#define RETRO_ENVIRONMENT_SET_VARIABLES 16
566 /* const struct retro_variable * --
567 * Allows an implementation to signal the environment
568 * which variables it might want to check for later using
569 * GET_VARIABLE.
570 * This allows the frontend to present these variables to
571 * a user dynamically.
572 * This should be called as early as possible (ideally in
573 * retro_set_environment).
574 *
575 * 'data' points to an array of retro_variable structs
576 * terminated by a { NULL, NULL } element.
577 * retro_variable::key should be namespaced to not collide
578 * with other implementations' keys. E.g. A core called
579 * 'foo' should use keys named as 'foo_option'.
580 * retro_variable::value should contain a human readable
581 * description of the key as well as a '|' delimited list
582 * of expected values.
583 *
584 * The number of possible options should be very limited,
585 * i.e. it should be feasible to cycle through options
586 * without a keyboard.
587 *
588 * First entry should be treated as a default.
589 *
590 * Example entry:
591 * { "foo_option", "Speed hack coprocessor X; false|true" }
592 *
593 * Text before first ';' is description. This ';' must be
594 * followed by a space, and followed by a list of possible
595 * values split up with '|'.
596 *
597 * Only strings are operated on. The possible values will
598 * generally be displayed and stored as-is by the frontend.
599 */
600#define RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE 17
601 /* bool * --
602 * Result is set to true if some variables are updated by
603 * frontend since last call to RETRO_ENVIRONMENT_GET_VARIABLE.
604 * Variables should be queried with GET_VARIABLE.
605 */
606#define RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME 18
607 /* const bool * --
608 * If true, the libretro implementation supports calls to
609 * retro_load_game() with NULL as argument.
610 * Used by cores which can run without particular game data.
611 * This should be called within retro_set_environment() only.
612 */
613#define RETRO_ENVIRONMENT_GET_LIBRETRO_PATH 19
614 /* const char ** --
615 * Retrieves the absolute path from where this libretro
616 * implementation was loaded.
617 * NULL is returned if the libretro was loaded statically
618 * (i.e. linked statically to frontend), or if the path cannot be
619 * determined.
620 * Mostly useful in cooperation with SET_SUPPORT_NO_GAME as assets can
621 * be loaded without ugly hacks.
622 */
623
624 /* Environment 20 was an obsolete version of SET_AUDIO_CALLBACK.
625 * It was not used by any known core at the time,
626 * and was removed from the API. */
627#define RETRO_ENVIRONMENT_SET_AUDIO_CALLBACK 22
628 /* const struct retro_audio_callback * --
629 * Sets an interface which is used to notify a libretro core about audio
630 * being available for writing.
631 * The callback can be called from any thread, so a core using this must
632 * have a thread safe audio implementation.
633 * It is intended for games where audio and video are completely
634 * asynchronous and audio can be generated on the fly.
635 * This interface is not recommended for use with emulators which have
636 * highly synchronous audio.
637 *
638 * The callback only notifies about writability; the libretro core still
639 * has to call the normal audio callbacks
640 * to write audio. The audio callbacks must be called from within the
641 * notification callback.
642 * The amount of audio data to write is up to the implementation.
643 * Generally, the audio callback will be called continously in a loop.
644 *
645 * Due to thread safety guarantees and lack of sync between audio and
646 * video, a frontend can selectively disallow this interface based on
647 * internal configuration. A core using this interface must also
648 * implement the "normal" audio interface.
649 *
650 * A libretro core using SET_AUDIO_CALLBACK should also make use of
651 * SET_FRAME_TIME_CALLBACK.
652 */
653#define RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK 21
654 /* const struct retro_frame_time_callback * --
655 * Lets the core know how much time has passed since last
656 * invocation of retro_run().
657 * The frontend can tamper with the timing to fake fast-forward,
658 * slow-motion, frame stepping, etc.
659 * In this case the delta time will use the reference value
660 * in frame_time_callback..
661 */
662#define RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE 23
663 /* struct retro_rumble_interface * --
664 * Gets an interface which is used by a libretro core to set
665 * state of rumble motors in controllers.
666 * A strong and weak motor is supported, and they can be
667 * controlled indepedently.
668 */
669#define RETRO_ENVIRONMENT_GET_INPUT_DEVICE_CAPABILITIES 24
670 /* uint64_t * --
671 * Gets a bitmask telling which device type are expected to be
672 * handled properly in a call to retro_input_state_t.
673 * Devices which are not handled or recognized always return
674 * 0 in retro_input_state_t.
675 * Example bitmask: caps = (1 << RETRO_DEVICE_JOYPAD) | (1 << RETRO_DEVICE_ANALOG).
676 * Should only be called in retro_run().
677 */
678#define RETRO_ENVIRONMENT_GET_SENSOR_INTERFACE (25 | RETRO_ENVIRONMENT_EXPERIMENTAL)
679 /* struct retro_sensor_interface * --
680 * Gets access to the sensor interface.
681 * The purpose of this interface is to allow
682 * setting state related to sensors such as polling rate,
683 * enabling/disable it entirely, etc.
684 * Reading sensor state is done via the normal
685 * input_state_callback API.
686 */
687#define RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE (26 | RETRO_ENVIRONMENT_EXPERIMENTAL)
688 /* struct retro_camera_callback * --
689 * Gets an interface to a video camera driver.
690 * A libretro core can use this interface to get access to a
691 * video camera.
692 * New video frames are delivered in a callback in same
693 * thread as retro_run().
694 *
695 * GET_CAMERA_INTERFACE should be called in retro_load_game().
696 *
697 * Depending on the camera implementation used, camera frames
698 * will be delivered as a raw framebuffer,
699 * or as an OpenGL texture directly.
700 *
701 * The core has to tell the frontend here which types of
702 * buffers can be handled properly.
703 * An OpenGL texture can only be handled when using a
704 * libretro GL core (SET_HW_RENDER).
705 * It is recommended to use a libretro GL core when
706 * using camera interface.
707 *
708 * The camera is not started automatically. The retrieved start/stop
709 * functions must be used to explicitly
710 * start and stop the camera driver.
711 */
712#define RETRO_ENVIRONMENT_GET_LOG_INTERFACE 27
713 /* struct retro_log_callback * --
714 * Gets an interface for logging. This is useful for
715 * logging in a cross-platform way
716 * as certain platforms cannot use use stderr for logging.
717 * It also allows the frontend to
718 * show logging information in a more suitable way.
719 * If this interface is not used, libretro cores should
720 * log to stderr as desired.
721 */
722#define RETRO_ENVIRONMENT_GET_PERF_INTERFACE 28
723 /* struct retro_perf_callback * --
724 * Gets an interface for performance counters. This is useful
725 * for performance logging in a cross-platform way and for detecting
726 * architecture-specific features, such as SIMD support.
727 */
728#define RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE 29
729 /* struct retro_location_callback * --
730 * Gets access to the location interface.
731 * The purpose of this interface is to be able to retrieve
732 * location-based information from the host device,
733 * such as current latitude / longitude.
734 */
735#define RETRO_ENVIRONMENT_GET_CONTENT_DIRECTORY 30 /* Old name, kept for compatibility. */
736#define RETRO_ENVIRONMENT_GET_CORE_ASSETS_DIRECTORY 30
737 /* const char ** --
738 * Returns the "core assets" directory of the frontend.
739 * This directory can be used to store specific assets that the
740 * core relies upon, such as art assets,
741 * input data, etc etc.
742 * The returned value can be NULL.
743 * If so, no such directory is defined,
744 * and it's up to the implementation to find a suitable directory.
745 */
746#define RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY 31
747 /* const char ** --
748 * Returns the "save" directory of the frontend.
749 * This directory can be used to store SRAM, memory cards,
750 * high scores, etc, if the libretro core
751 * cannot use the regular memory interface (retro_get_memory_data()).
752 *
753 * NOTE: libretro cores used to check GET_SYSTEM_DIRECTORY for
754 * similar things before.
755 * They should still check GET_SYSTEM_DIRECTORY if they want to
756 * be backwards compatible.
757 * The path here can be NULL. It should only be non-NULL if the
758 * frontend user has set a specific save path.
759 */
760#define RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO 32
761 /* const struct retro_system_av_info * --
762 * Sets a new av_info structure. This can only be called from
763 * within retro_run().
764 * This should *only* be used if the core is completely altering the
765 * internal resolutions, aspect ratios, timings, sampling rate, etc.
766 * Calling this can require a full reinitialization of video/audio
767 * drivers in the frontend,
768 *
769 * so it is important to call it very sparingly, and usually only with
770 * the users explicit consent.
771 * An eventual driver reinitialize will happen so that video and
772 * audio callbacks
773 * happening after this call within the same retro_run() call will
774 * target the newly initialized driver.
775 *
776 * This callback makes it possible to support configurable resolutions
777 * in games, which can be useful to
778 * avoid setting the "worst case" in max_width/max_height.
779 *
780 * ***HIGHLY RECOMMENDED*** Do not call this callback every time
781 * resolution changes in an emulator core if it's
782 * expected to be a temporary change, for the reasons of possible
783 * driver reinitialization.
784 * This call is not a free pass for not trying to provide
785 * correct values in retro_get_system_av_info(). If you need to change
786 * things like aspect ratio or nominal width/height,
787 * use RETRO_ENVIRONMENT_SET_GEOMETRY, which is a softer variant
788 * of SET_SYSTEM_AV_INFO.
789 *
790 * If this returns false, the frontend does not acknowledge a
791 * changed av_info struct.
792 */
793#define RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK 33
794 /* const struct retro_get_proc_address_interface * --
795 * Allows a libretro core to announce support for the
796 * get_proc_address() interface.
797 * This interface allows for a standard way to extend libretro where
798 * use of environment calls are too indirect,
799 * e.g. for cases where the frontend wants to call directly into the core.
800 *
801 * If a core wants to expose this interface, SET_PROC_ADDRESS_CALLBACK
802 * **MUST** be called from within retro_set_environment().
803 */
804#define RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO 34
805 /* const struct retro_subsystem_info * --
806 * This environment call introduces the concept of libretro "subsystems".
807 * A subsystem is a variant of a libretro core which supports
808 * different kinds of games.
809 * The purpose of this is to support e.g. emulators which might
810 * have special needs, e.g. Super Nintendo's Super GameBoy, Sufami Turbo.
811 * It can also be used to pick among subsystems in an explicit way
812 * if the libretro implementation is a multi-system emulator itself.
813 *
814 * Loading a game via a subsystem is done with retro_load_game_special(),
815 * and this environment call allows a libretro core to expose which
816 * subsystems are supported for use with retro_load_game_special().
817 * A core passes an array of retro_game_special_info which is terminated
818 * with a zeroed out retro_game_special_info struct.
819 *
820 * If a core wants to use this functionality, SET_SUBSYSTEM_INFO
821 * **MUST** be called from within retro_set_environment().
822 */
823#define RETRO_ENVIRONMENT_SET_CONTROLLER_INFO 35
824 /* const struct retro_controller_info * --
825 * This environment call lets a libretro core tell the frontend
826 * which controller types are recognized in calls to
827 * retro_set_controller_port_device().
828 *
829 * Some emulators such as Super Nintendo
830 * support multiple lightgun types which must be specifically
831 * selected from.
832 * It is therefore sometimes necessary for a frontend to be able
833 * to tell the core about a special kind of input device which is
834 * not covered by the libretro input API.
835 *
836 * In order for a frontend to understand the workings of an input device,
837 * it must be a specialized type
838 * of the generic device types already defined in the libretro API.
839 *
840 * Which devices are supported can vary per input port.
841 * The core must pass an array of const struct retro_controller_info which
842 * is terminated with a blanked out struct. Each element of the struct
843 * corresponds to an ascending port index to
844 * retro_set_controller_port_device().
845 * Even if special device types are set in the libretro core,
846 * libretro should only poll input based on the base input device types.
847 */
848#define RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL)
849 /* const struct retro_memory_map * --
850 * This environment call lets a libretro core tell the frontend
851 * about the memory maps this core emulates.
852 * This can be used to implement, for example, cheats in a core-agnostic way.
853 *
854 * Should only be used by emulators; it doesn't make much sense for
855 * anything else.
856 * It is recommended to expose all relevant pointers through
857 * retro_get_memory_* as well.
858 *
859 * Can be called from retro_init and retro_load_game.
860 */
861#define RETRO_ENVIRONMENT_SET_GEOMETRY 37
862 /* const struct retro_game_geometry * --
863 * This environment call is similar to SET_SYSTEM_AV_INFO for changing
864 * video parameters, but provides a guarantee that drivers will not be
865 * reinitialized.
866 * This can only be called from within retro_run().
867 *
868 * The purpose of this call is to allow a core to alter nominal
869 * width/heights as well as aspect ratios on-the-fly, which can be
870 * useful for some emulators to change in run-time.
871 *
872 * max_width/max_height arguments are ignored and cannot be changed
873 * with this call as this could potentially require a reinitialization or a
874 * non-constant time operation.
875 * If max_width/max_height are to be changed, SET_SYSTEM_AV_INFO is required.
876 *
877 * A frontend must guarantee that this environment call completes in
878 * constant time.
879 */
880#define RETRO_ENVIRONMENT_GET_USERNAME 38
881 /* const char **
882 * Returns the specified username of the frontend, if specified by the user.
883 * This username can be used as a nickname for a core that has online facilities
884 * or any other mode where personalization of the user is desirable.
885 * The returned value can be NULL.
886 * If this environ callback is used by a core that requires a valid username,
887 * a default username should be specified by the core.
888 */
889#define RETRO_ENVIRONMENT_GET_LANGUAGE 39
890 /* unsigned * --
891 * Returns the specified language of the frontend, if specified by the user.
892 * It can be used by the core for localization purposes.
893 */
894#define RETRO_ENVIRONMENT_GET_CURRENT_SOFTWARE_FRAMEBUFFER (40 | RETRO_ENVIRONMENT_EXPERIMENTAL)
895 /* struct retro_framebuffer * --
896 * Returns a preallocated framebuffer which the core can use for rendering
897 * the frame into when not using SET_HW_RENDER.
898 * The framebuffer returned from this call must not be used
899 * after the current call to retro_run() returns.
900 *
901 * The goal of this call is to allow zero-copy behavior where a core
902 * can render directly into video memory, avoiding extra bandwidth cost by copying
903 * memory from core to video memory.
904 *
905 * If this call succeeds and the core renders into it,
906 * the framebuffer pointer and pitch can be passed to retro_video_refresh_t.
907 * If the buffer from GET_CURRENT_SOFTWARE_FRAMEBUFFER is to be used,
908 * the core must pass the exact
909 * same pointer as returned by GET_CURRENT_SOFTWARE_FRAMEBUFFER;
910 * i.e. passing a pointer which is offset from the
911 * buffer is undefined. The width, height and pitch parameters
912 * must also match exactly to the values obtained from GET_CURRENT_SOFTWARE_FRAMEBUFFER.
913 *
914 * It is possible for a frontend to return a different pixel format
915 * than the one used in SET_PIXEL_FORMAT. This can happen if the frontend
916 * needs to perform conversion.
917 *
918 * It is still valid for a core to render to a different buffer
919 * even if GET_CURRENT_SOFTWARE_FRAMEBUFFER succeeds.
920 *
921 * A frontend must make sure that the pointer obtained from this function is
922 * writeable (and readable).
923 */
924
925enum retro_hw_render_interface_type
926{
927 RETRO_HW_RENDER_INTERFACE_VULKAN = 0,
928 RETRO_HW_RENDER_INTERFACE_DUMMY = INT_MAX
929};
930
931/* Base struct. All retro_hw_render_interface_* types
932 * contain at least these fields. */
933struct retro_hw_render_interface
934{
935 enum retro_hw_render_interface_type interface_type;
936 unsigned interface_version;
937};
938#define RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE (41 | RETRO_ENVIRONMENT_EXPERIMENTAL)
939 /* const struct retro_hw_render_interface ** --
940 * Returns an API specific rendering interface for accessing API specific data.
941 * Not all HW rendering APIs support or need this.
942 * The contents of the returned pointer is specific to the rendering API
943 * being used. See the various headers like libretro_vulkan.h, etc.
944 *
945 * GET_HW_RENDER_INTERFACE cannot be called before context_reset has been called.
946 * Similarly, after context_destroyed callback returns,
947 * the contents of the HW_RENDER_INTERFACE are invalidated.
948 */
949
950#define RETRO_MEMDESC_CONST (1 << 0) /* The frontend will never change this memory area once retro_load_game has returned. */
951#define RETRO_MEMDESC_BIGENDIAN (1 << 1) /* The memory area contains big endian data. Default is little endian. */
952#define RETRO_MEMDESC_ALIGN_2 (1 << 16) /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */
953#define RETRO_MEMDESC_ALIGN_4 (2 << 16)
954#define RETRO_MEMDESC_ALIGN_8 (3 << 16)
955#define RETRO_MEMDESC_MINSIZE_2 (1 << 24) /* All memory in this region is accessed at least 2 bytes at the time. */
956#define RETRO_MEMDESC_MINSIZE_4 (2 << 24)
957#define RETRO_MEMDESC_MINSIZE_8 (3 << 24)
958struct retro_memory_descriptor
959{
960 uint64_t flags;
961
962 /* Pointer to the start of the relevant ROM or RAM chip.
963 * It's strongly recommended to use 'offset' if possible, rather than
964 * doing math on the pointer.
965 *
966 * If the same byte is mapped my multiple descriptors, their descriptors
967 * must have the same pointer.
968 * If 'start' does not point to the first byte in the pointer, put the
969 * difference in 'offset' instead.
970 *
971 * May be NULL if there's nothing usable here (e.g. hardware registers and
972 * open bus). No flags should be set if the pointer is NULL.
973 * It's recommended to minimize the number of descriptors if possible,
974 * but not mandatory. */
975 void *ptr;
976 size_t offset;
977
978 /* This is the location in the emulated address space
979 * where the mapping starts. */
980 size_t start;
981
982 /* Which bits must be same as in 'start' for this mapping to apply.
983 * The first memory descriptor to claim a certain byte is the one
984 * that applies.
985 * A bit which is set in 'start' must also be set in this.
986 * Can be zero, in which case each byte is assumed mapped exactly once.
987 * In this case, 'len' must be a power of two. */
988 size_t select;
989
990 /* If this is nonzero, the set bits are assumed not connected to the
991 * memory chip's address pins. */
992 size_t disconnect;
993
994 /* This one tells the size of the current memory area.
995 * If, after start+disconnect are applied, the address is higher than
996 * this, the highest bit of the address is cleared.
997 *
998 * If the address is still too high, the next highest bit is cleared.
999 * Can be zero, in which case it's assumed to be infinite (as limited
1000 * by 'select' and 'disconnect'). */
1001 size_t len;
1002
1003 /* To go from emulated address to physical address, the following
1004 * order applies:
1005 * Subtract 'start', pick off 'disconnect', apply 'len', add 'offset'.
1006 *
1007 * The address space name must consist of only a-zA-Z0-9_-,
1008 * should be as short as feasible (maximum length is 8 plus the NUL),
1009 * and may not be any other address space plus one or more 0-9A-F
1010 * at the end.
1011 * However, multiple memory descriptors for the same address space is
1012 * allowed, and the address space name can be empty. NULL is treated
1013 * as empty.
1014 *
1015 * Address space names are case sensitive, but avoid lowercase if possible.
1016 * The same pointer may exist in multiple address spaces.
1017 *
1018 * Examples:
1019 * blank+blank - valid (multiple things may be mapped in the same namespace)
1020 * 'Sp'+'Sp' - valid (multiple things may be mapped in the same namespace)
1021 * 'A'+'B' - valid (neither is a prefix of each other)
1022 * 'S'+blank - valid ('S' is not in 0-9A-F)
1023 * 'a'+blank - valid ('a' is not in 0-9A-F)
1024 * 'a'+'A' - valid (neither is a prefix of each other)
1025 * 'AR'+blank - valid ('R' is not in 0-9A-F)
1026 * 'ARB'+blank - valid (the B can't be part of the address either, because
1027 * there is no namespace 'AR')
1028 * blank+'B' - not valid, because it's ambigous which address space B1234
1029 * would refer to.
1030 * The length can't be used for that purpose; the frontend may want
1031 * to append arbitrary data to an address, without a separator. */
1032 const char *addrspace;
1033};
1034
1035/* The frontend may use the largest value of 'start'+'select' in a
1036 * certain namespace to infer the size of the address space.
1037 *
1038 * If the address space is larger than that, a mapping with .ptr=NULL
1039 * should be at the end of the array, with .select set to all ones for
1040 * as long as the address space is big.
1041 *
1042 * Sample descriptors (minus .ptr, and RETRO_MEMFLAG_ on the flags):
1043 * SNES WRAM:
1044 * .start=0x7E0000, .len=0x20000
1045 * (Note that this must be mapped before the ROM in most cases; some of the
1046 * ROM mappers
1047 * try to claim $7E0000, or at least $7E8000.)
1048 * SNES SPC700 RAM:
1049 * .addrspace="S", .len=0x10000
1050 * SNES WRAM mirrors:
1051 * .flags=MIRROR, .start=0x000000, .select=0xC0E000, .len=0x2000
1052 * .flags=MIRROR, .start=0x800000, .select=0xC0E000, .len=0x2000
1053 * SNES WRAM mirrors, alternate equivalent descriptor:
1054 * .flags=MIRROR, .select=0x40E000, .disconnect=~0x1FFF
1055 * (Various similar constructions can be created by combining parts of
1056 * the above two.)
1057 * SNES LoROM (512KB, mirrored a couple of times):
1058 * .flags=CONST, .start=0x008000, .select=0x408000, .disconnect=0x8000, .len=512*1024
1059 * .flags=CONST, .start=0x400000, .select=0x400000, .disconnect=0x8000, .len=512*1024
1060 * SNES HiROM (4MB):
1061 * .flags=CONST, .start=0x400000, .select=0x400000, .len=4*1024*1024
1062 * .flags=CONST, .offset=0x8000, .start=0x008000, .select=0x408000, .len=4*1024*1024
1063 * SNES ExHiROM (8MB):
1064 * .flags=CONST, .offset=0, .start=0xC00000, .select=0xC00000, .len=4*1024*1024
1065 * .flags=CONST, .offset=4*1024*1024, .start=0x400000, .select=0xC00000, .len=4*1024*1024
1066 * .flags=CONST, .offset=0x8000, .start=0x808000, .select=0xC08000, .len=4*1024*1024
1067 * .flags=CONST, .offset=4*1024*1024+0x8000, .start=0x008000, .select=0xC08000, .len=4*1024*1024
1068 * Clarify the size of the address space:
1069 * .ptr=NULL, .select=0xFFFFFF
1070 * .len can be implied by .select in many of them, but was included for clarity.
1071 */
1072
1073struct retro_memory_map
1074{
1075 const struct retro_memory_descriptor *descriptors;
1076 unsigned num_descriptors;
1077};
1078
1079struct retro_controller_description
1080{
1081 /* Human-readable description of the controller. Even if using a generic
1082 * input device type, this can be set to the particular device type the
1083 * core uses. */
1084 const char *desc;
1085
1086 /* Device type passed to retro_set_controller_port_device(). If the device
1087 * type is a sub-class of a generic input device type, use the
1088 * RETRO_DEVICE_SUBCLASS macro to create an ID.
1089 *
1090 * E.g. RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1). */
1091 unsigned id;
1092};
1093
1094struct retro_controller_info
1095{
1096 const struct retro_controller_description *types;
1097 unsigned num_types;
1098};
1099
1100struct retro_subsystem_memory_info
1101{
1102 /* The extension associated with a memory type, e.g. "psram". */
1103 const char *extension;
1104
1105 /* The memory type for retro_get_memory(). This should be at
1106 * least 0x100 to avoid conflict with standardized
1107 * libretro memory types. */
1108 unsigned type;
1109};
1110
1111struct retro_subsystem_rom_info
1112{
1113 /* Describes what the content is (SGB BIOS, GB ROM, etc). */
1114 const char *desc;
1115
1116 /* Same definition as retro_get_system_info(). */
1117 const char *valid_extensions;
1118
1119 /* Same definition as retro_get_system_info(). */
1120 bool need_fullpath;
1121
1122 /* Same definition as retro_get_system_info(). */
1123 bool block_extract;
1124
1125 /* This is set if the content is required to load a game.
1126 * If this is set to false, a zeroed-out retro_game_info can be passed. */
1127 bool required;
1128
1129 /* Content can have multiple associated persistent
1130 * memory types (retro_get_memory()). */
1131 const struct retro_subsystem_memory_info *memory;
1132 unsigned num_memory;
1133};
1134
1135struct retro_subsystem_info
1136{
1137 /* Human-readable string of the subsystem type, e.g. "Super GameBoy" */
1138 const char *desc;
1139
1140 /* A computer friendly short string identifier for the subsystem type.
1141 * This name must be [a-z].
1142 * E.g. if desc is "Super GameBoy", this can be "sgb".
1143 * This identifier can be used for command-line interfaces, etc.
1144 */
1145 const char *ident;
1146
1147 /* Infos for each content file. The first entry is assumed to be the
1148 * "most significant" content for frontend purposes.
1149 * E.g. with Super GameBoy, the first content should be the GameBoy ROM,
1150 * as it is the most "significant" content to a user.
1151 * If a frontend creates new file paths based on the content used
1152 * (e.g. savestates), it should use the path for the first ROM to do so. */
1153 const struct retro_subsystem_rom_info *roms;
1154
1155 /* Number of content files associated with a subsystem. */
1156 unsigned num_roms;
1157
1158 /* The type passed to retro_load_game_special(). */
1159 unsigned id;
1160};
1161
1162typedef void (*retro_proc_address_t)(void);
1163
1164/* libretro API extension functions:
1165 * (None here so far).
1166 *
1167 * Get a symbol from a libretro core.
1168 * Cores should only return symbols which are actual
1169 * extensions to the libretro API.
1170 *
1171 * Frontends should not use this to obtain symbols to standard
1172 * libretro entry points (static linking or dlsym).
1173 *
1174 * The symbol name must be equal to the function name,
1175 * e.g. if void retro_foo(void); exists, the symbol must be called "retro_foo".
1176 * The returned function pointer must be cast to the corresponding type.
1177 */
1178typedef retro_proc_address_t (*retro_get_proc_address_t)(const char *sym);
1179
1180struct retro_get_proc_address_interface
1181{
1182 retro_get_proc_address_t get_proc_address;
1183};
1184
1185enum retro_log_level
1186{
1187 RETRO_LOG_DEBUG = 0,
1188 RETRO_LOG_INFO,
1189 RETRO_LOG_WARN,
1190 RETRO_LOG_ERROR,
1191
1192 RETRO_LOG_DUMMY = INT_MAX
1193};
1194
1195/* Logging function. Takes log level argument as well. */
1196typedef void (*retro_log_printf_t)(enum retro_log_level level,
1197 const char *fmt, ...);
1198
1199struct retro_log_callback
1200{
1201 retro_log_printf_t log;
1202};
1203
1204/* Performance related functions */
1205
1206/* ID values for SIMD CPU features */
1207#define RETRO_SIMD_SSE (1 << 0)
1208#define RETRO_SIMD_SSE2 (1 << 1)
1209#define RETRO_SIMD_VMX (1 << 2)
1210#define RETRO_SIMD_VMX128 (1 << 3)
1211#define RETRO_SIMD_AVX (1 << 4)
1212#define RETRO_SIMD_NEON (1 << 5)
1213#define RETRO_SIMD_SSE3 (1 << 6)
1214#define RETRO_SIMD_SSSE3 (1 << 7)
1215#define RETRO_SIMD_MMX (1 << 8)
1216#define RETRO_SIMD_MMXEXT (1 << 9)
1217#define RETRO_SIMD_SSE4 (1 << 10)
1218#define RETRO_SIMD_SSE42 (1 << 11)
1219#define RETRO_SIMD_AVX2 (1 << 12)
1220#define RETRO_SIMD_VFPU (1 << 13)
1221#define RETRO_SIMD_PS (1 << 14)
1222#define RETRO_SIMD_AES (1 << 15)
1223#define RETRO_SIMD_VFPV3 (1 << 16)
1224#define RETRO_SIMD_VFPV4 (1 << 17)
1225#define RETRO_SIMD_POPCNT (1 << 18)
1226#define RETRO_SIMD_MOVBE (1 << 19)
1227
1228typedef uint64_t retro_perf_tick_t;
1229typedef int64_t retro_time_t;
1230
1231struct retro_perf_counter
1232{
1233 const char *ident;
1234 retro_perf_tick_t start;
1235 retro_perf_tick_t total;
1236 retro_perf_tick_t call_cnt;
1237
1238 bool registered;
1239};
1240
1241/* Returns current time in microseconds.
1242 * Tries to use the most accurate timer available.
1243 */
1244typedef retro_time_t (*retro_perf_get_time_usec_t)(void);
1245
1246/* A simple counter. Usually nanoseconds, but can also be CPU cycles.
1247 * Can be used directly if desired (when creating a more sophisticated
1248 * performance counter system).
1249 * */
1250typedef retro_perf_tick_t (*retro_perf_get_counter_t)(void);
1251
1252/* Returns a bit-mask of detected CPU features (RETRO_SIMD_*). */
1253typedef uint64_t (*retro_get_cpu_features_t)(void);
1254
1255/* Asks frontend to log and/or display the state of performance counters.
1256 * Performance counters can always be poked into manually as well.
1257 */
1258typedef void (*retro_perf_log_t)(void);
1259
1260/* Register a performance counter.
1261 * ident field must be set with a discrete value and other values in
1262 * retro_perf_counter must be 0.
1263 * Registering can be called multiple times. To avoid calling to
1264 * frontend redundantly, you can check registered field first. */
1265typedef void (*retro_perf_register_t)(struct retro_perf_counter *counter);
1266
1267/* Starts a registered counter. */
1268typedef void (*retro_perf_start_t)(struct retro_perf_counter *counter);
1269
1270/* Stops a registered counter. */
1271typedef void (*retro_perf_stop_t)(struct retro_perf_counter *counter);
1272
1273/* For convenience it can be useful to wrap register, start and stop in macros.
1274 * E.g.:
1275 * #ifdef LOG_PERFORMANCE
1276 * #define RETRO_PERFORMANCE_INIT(perf_cb, name) static struct retro_perf_counter name = {#name}; if (!name.registered) perf_cb.perf_register(&(name))
1277 * #define RETRO_PERFORMANCE_START(perf_cb, name) perf_cb.perf_start(&(name))
1278 * #define RETRO_PERFORMANCE_STOP(perf_cb, name) perf_cb.perf_stop(&(name))
1279 * #else
1280 * ... Blank macros ...
1281 * #endif
1282 *
1283 * These can then be used mid-functions around code snippets.
1284 *
1285 * extern struct retro_perf_callback perf_cb; * Somewhere in the core.
1286 *
1287 * void do_some_heavy_work(void)
1288 * {
1289 * RETRO_PERFORMANCE_INIT(cb, work_1;
1290 * RETRO_PERFORMANCE_START(cb, work_1);
1291 * heavy_work_1();
1292 * RETRO_PERFORMANCE_STOP(cb, work_1);
1293 *
1294 * RETRO_PERFORMANCE_INIT(cb, work_2);
1295 * RETRO_PERFORMANCE_START(cb, work_2);
1296 * heavy_work_2();
1297 * RETRO_PERFORMANCE_STOP(cb, work_2);
1298 * }
1299 *
1300 * void retro_deinit(void)
1301 * {
1302 * perf_cb.perf_log(); * Log all perf counters here for example.
1303 * }
1304 */
1305
1306struct retro_perf_callback
1307{
1308 retro_perf_get_time_usec_t get_time_usec;
1309 retro_get_cpu_features_t get_cpu_features;
1310
1311 retro_perf_get_counter_t get_perf_counter;
1312 retro_perf_register_t perf_register;
1313 retro_perf_start_t perf_start;
1314 retro_perf_stop_t perf_stop;
1315 retro_perf_log_t perf_log;
1316};
1317
1318/* FIXME: Document the sensor API and work out behavior.
1319 * It will be marked as experimental until then.
1320 */
1321enum retro_sensor_action
1322{
1323 RETRO_SENSOR_ACCELEROMETER_ENABLE = 0,
1324 RETRO_SENSOR_ACCELEROMETER_DISABLE,
1325
1326 RETRO_SENSOR_DUMMY = INT_MAX
1327};
1328
1329/* Id values for SENSOR types. */
1330#define RETRO_SENSOR_ACCELEROMETER_X 0
1331#define RETRO_SENSOR_ACCELEROMETER_Y 1
1332#define RETRO_SENSOR_ACCELEROMETER_Z 2
1333
1334typedef bool (*retro_set_sensor_state_t)(unsigned port,
1335 enum retro_sensor_action action, unsigned rate);
1336
1337typedef float (*retro_sensor_get_input_t)(unsigned port, unsigned id);
1338
1339struct retro_sensor_interface
1340{
1341 retro_set_sensor_state_t set_sensor_state;
1342 retro_sensor_get_input_t get_sensor_input;
1343};
1344
1345enum retro_camera_buffer
1346{
1347 RETRO_CAMERA_BUFFER_OPENGL_TEXTURE = 0,
1348 RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER,
1349
1350 RETRO_CAMERA_BUFFER_DUMMY = INT_MAX
1351};
1352
1353/* Starts the camera driver. Can only be called in retro_run(). */
1354typedef bool (*retro_camera_start_t)(void);
1355
1356/* Stops the camera driver. Can only be called in retro_run(). */
1357typedef void (*retro_camera_stop_t)(void);
1358
1359/* Callback which signals when the camera driver is initialized
1360 * and/or deinitialized.
1361 * retro_camera_start_t can be called in initialized callback.
1362 */
1363typedef void (*retro_camera_lifetime_status_t)(void);
1364
1365/* A callback for raw framebuffer data. buffer points to an XRGB8888 buffer.
1366 * Width, height and pitch are similar to retro_video_refresh_t.
1367 * First pixel is top-left origin.
1368 */
1369typedef void (*retro_camera_frame_raw_framebuffer_t)(const uint32_t *buffer,
1370 unsigned width, unsigned height, size_t pitch);
1371
1372/* A callback for when OpenGL textures are used.
1373 *
1374 * texture_id is a texture owned by camera driver.
1375 * Its state or content should be considered immutable, except for things like
1376 * texture filtering and clamping.
1377 *
1378 * texture_target is the texture target for the GL texture.
1379 * These can include e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE, and possibly
1380 * more depending on extensions.
1381 *
1382 * affine points to a packed 3x3 column-major matrix used to apply an affine
1383 * transform to texture coordinates. (affine_matrix * vec3(coord_x, coord_y, 1.0))
1384 * After transform, normalized texture coord (0, 0) should be bottom-left
1385 * and (1, 1) should be top-right (or (width, height) for RECTANGLE).
1386 *
1387 * GL-specific typedefs are avoided here to avoid relying on gl.h in
1388 * the API definition.
1389 */
1390typedef void (*retro_camera_frame_opengl_texture_t)(unsigned texture_id,
1391 unsigned texture_target, const float *affine);
1392
1393struct retro_camera_callback
1394{
1395 /* Set by libretro core.
1396 * Example bitmask: caps = (1 << RETRO_CAMERA_BUFFER_OPENGL_TEXTURE) | (1 << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER).
1397 */
1398 uint64_t caps;
1399
1400 unsigned width; /* Desired resolution for camera. Is only used as a hint. */
1401 unsigned height;
1402 retro_camera_start_t start; /* Set by frontend. */
1403 retro_camera_stop_t stop; /* Set by frontend. */
1404
1405 /* Set by libretro core if raw framebuffer callbacks will be used. */
1406 retro_camera_frame_raw_framebuffer_t frame_raw_framebuffer;
1407 /* Set by libretro core if OpenGL texture callbacks will be used. */
1408 retro_camera_frame_opengl_texture_t frame_opengl_texture;
1409
1410 /* Set by libretro core. Called after camera driver is initialized and
1411 * ready to be started.
1412 * Can be NULL, in which this callback is not called.
1413 */
1414 retro_camera_lifetime_status_t initialized;
1415
1416 /* Set by libretro core. Called right before camera driver is
1417 * deinitialized.
1418 * Can be NULL, in which this callback is not called.
1419 */
1420 retro_camera_lifetime_status_t deinitialized;
1421};
1422
1423/* Sets the interval of time and/or distance at which to update/poll
1424 * location-based data.
1425 *
1426 * To ensure compatibility with all location-based implementations,
1427 * values for both interval_ms and interval_distance should be provided.
1428 *
1429 * interval_ms is the interval expressed in milliseconds.
1430 * interval_distance is the distance interval expressed in meters.
1431 */
1432typedef void (*retro_location_set_interval_t)(unsigned interval_ms,
1433 unsigned interval_distance);
1434
1435/* Start location services. The device will start listening for changes to the
1436 * current location at regular intervals (which are defined with
1437 * retro_location_set_interval_t). */
1438typedef bool (*retro_location_start_t)(void);
1439
1440/* Stop location services. The device will stop listening for changes
1441 * to the current location. */
1442typedef void (*retro_location_stop_t)(void);
1443
1444/* Get the position of the current location. Will set parameters to
1445 * 0 if no new location update has happened since the last time. */
1446typedef bool (*retro_location_get_position_t)(double *lat, double *lon,
1447 double *horiz_accuracy, double *vert_accuracy);
1448
1449/* Callback which signals when the location driver is initialized
1450 * and/or deinitialized.
1451 * retro_location_start_t can be called in initialized callback.
1452 */
1453typedef void (*retro_location_lifetime_status_t)(void);
1454
1455struct retro_location_callback
1456{
1457 retro_location_start_t start;
1458 retro_location_stop_t stop;
1459 retro_location_get_position_t get_position;
1460 retro_location_set_interval_t set_interval;
1461
1462 retro_location_lifetime_status_t initialized;
1463 retro_location_lifetime_status_t deinitialized;
1464};
1465
1466enum retro_rumble_effect
1467{
1468 RETRO_RUMBLE_STRONG = 0,
1469 RETRO_RUMBLE_WEAK = 1,
1470
1471 RETRO_RUMBLE_DUMMY = INT_MAX
1472};
1473
1474/* Sets rumble state for joypad plugged in port 'port'.
1475 * Rumble effects are controlled independently,
1476 * and setting e.g. strong rumble does not override weak rumble.
1477 * Strength has a range of [0, 0xffff].
1478 *
1479 * Returns true if rumble state request was honored.
1480 * Calling this before first retro_run() is likely to return false. */
1481typedef bool (*retro_set_rumble_state_t)(unsigned port,
1482 enum retro_rumble_effect effect, uint16_t strength);
1483
1484struct retro_rumble_interface
1485{
1486 retro_set_rumble_state_t set_rumble_state;
1487};
1488
1489/* Notifies libretro that audio data should be written. */
1490typedef void (*retro_audio_callback_t)(void);
1491
1492/* True: Audio driver in frontend is active, and callback is
1493 * expected to be called regularily.
1494 * False: Audio driver in frontend is paused or inactive.
1495 * Audio callback will not be called until set_state has been
1496 * called with true.
1497 * Initial state is false (inactive).
1498 */
1499typedef void (*retro_audio_set_state_callback_t)(bool enabled);
1500
1501struct retro_audio_callback
1502{
1503 retro_audio_callback_t callback;
1504 retro_audio_set_state_callback_t set_state;
1505};
1506
1507/* Notifies a libretro core of time spent since last invocation
1508 * of retro_run() in microseconds.
1509 *
1510 * It will be called right before retro_run() every frame.
1511 * The frontend can tamper with timing to support cases like
1512 * fast-forward, slow-motion and framestepping.
1513 *
1514 * In those scenarios the reference frame time value will be used. */
1515typedef int64_t retro_usec_t;
1516typedef void (*retro_frame_time_callback_t)(retro_usec_t usec);
1517struct retro_frame_time_callback
1518{
1519 retro_frame_time_callback_t callback;
1520 /* Represents the time of one frame. It is computed as
1521 * 1000000 / fps, but the implementation will resolve the
1522 * rounding to ensure that framestepping, etc is exact. */
1523 retro_usec_t reference;
1524};
1525
1526/* Pass this to retro_video_refresh_t if rendering to hardware.
1527 * Passing NULL to retro_video_refresh_t is still a frame dupe as normal.
1528 * */
1529#define RETRO_HW_FRAME_BUFFER_VALID ((void*)-1)
1530
1531/* Invalidates the current HW context.
1532 * Any GL state is lost, and must not be deinitialized explicitly.
1533 * If explicit deinitialization is desired by the libretro core,
1534 * it should implement context_destroy callback.
1535 * If called, all GPU resources must be reinitialized.
1536 * Usually called when frontend reinits video driver.
1537 * Also called first time video driver is initialized,
1538 * allowing libretro core to initialize resources.
1539 */
1540typedef void (*retro_hw_context_reset_t)(void);
1541
1542/* Gets current framebuffer which is to be rendered to.
1543 * Could change every frame potentially.
1544 */
1545typedef uintptr_t (*retro_hw_get_current_framebuffer_t)(void);
1546
1547/* Get a symbol from HW context. */
1548typedef retro_proc_address_t (*retro_hw_get_proc_address_t)(const char *sym);
1549
1550enum retro_hw_context_type
1551{
1552 RETRO_HW_CONTEXT_NONE = 0,
1553 /* OpenGL 2.x. Driver can choose to use latest compatibility context. */
1554 RETRO_HW_CONTEXT_OPENGL = 1,
1555 /* OpenGL ES 2.0. */
1556 RETRO_HW_CONTEXT_OPENGLES2 = 2,
1557 /* Modern desktop core GL context. Use version_major/
1558 * version_minor fields to set GL version. */
1559 RETRO_HW_CONTEXT_OPENGL_CORE = 3,
1560 /* OpenGL ES 3.0 */
1561 RETRO_HW_CONTEXT_OPENGLES3 = 4,
1562 /* OpenGL ES 3.1+. Set version_major/version_minor. For GLES2 and GLES3,
1563 * use the corresponding enums directly. */
1564 RETRO_HW_CONTEXT_OPENGLES_VERSION = 5,
1565
1566 /* Vulkan, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE. */
1567 RETRO_HW_CONTEXT_VULKAN = 6,
1568
1569 RETRO_HW_CONTEXT_DUMMY = INT_MAX
1570};
1571
1572struct retro_hw_render_callback
1573{
1574 /* Which API to use. Set by libretro core. */
1575 enum retro_hw_context_type context_type;
1576
1577 /* Called when a context has been created or when it has been reset.
1578 * An OpenGL context is only valid after context_reset() has been called.
1579 *
1580 * When context_reset is called, OpenGL resources in the libretro
1581 * implementation are guaranteed to be invalid.
1582 *
1583 * It is possible that context_reset is called multiple times during an
1584 * application lifecycle.
1585 * If context_reset is called without any notification (context_destroy),
1586 * the OpenGL context was lost and resources should just be recreated
1587 * without any attempt to "free" old resources.
1588 */
1589 retro_hw_context_reset_t context_reset;
1590
1591 /* Set by frontend.
1592 * TODO: This is rather obsolete. The frontend should not
1593 * be providing preallocated framebuffers. */
1594 retro_hw_get_current_framebuffer_t get_current_framebuffer;
1595
1596 /* Set by frontend. */
1597 retro_hw_get_proc_address_t get_proc_address;
1598
1599 /* Set if render buffers should have depth component attached.
1600 * TODO: Obsolete. */
1601 bool depth;
1602
1603 /* Set if stencil buffers should be attached.
1604 * TODO: Obsolete. */
1605 bool stencil;
1606
1607 /* If depth and stencil are true, a packed 24/8 buffer will be added.
1608 * Only attaching stencil is invalid and will be ignored. */
1609
1610 /* Use conventional bottom-left origin convention. If false,
1611 * standard libretro top-left origin semantics are used.
1612 * TODO: Move to GL specific interface. */
1613 bool bottom_left_origin;
1614
1615 /* Major version number for core GL context or GLES 3.1+. */
1616 unsigned version_major;
1617
1618 /* Minor version number for core GL context or GLES 3.1+. */
1619 unsigned version_minor;
1620
1621 /* If this is true, the frontend will go very far to avoid
1622 * resetting context in scenarios like toggling fullscreen, etc.
1623 * TODO: Obsolete? Maybe frontend should just always assume this ...
1624 */
1625 bool cache_context;
1626
1627 /* The reset callback might still be called in extreme situations
1628 * such as if the context is lost beyond recovery.
1629 *
1630 * For optimal stability, set this to false, and allow context to be
1631 * reset at any time.
1632 */
1633
1634 /* A callback to be called before the context is destroyed in a
1635 * controlled way by the frontend. */
1636 retro_hw_context_reset_t context_destroy;
1637
1638 /* OpenGL resources can be deinitialized cleanly at this step.
1639 * context_destroy can be set to NULL, in which resources will
1640 * just be destroyed without any notification.
1641 *
1642 * Even when context_destroy is non-NULL, it is possible that
1643 * context_reset is called without any destroy notification.
1644 * This happens if context is lost by external factors (such as
1645 * notified by GL_ARB_robustness).
1646 *
1647 * In this case, the context is assumed to be already dead,
1648 * and the libretro implementation must not try to free any OpenGL
1649 * resources in the subsequent context_reset.
1650 */
1651
1652 /* Creates a debug context. */
1653 bool debug_context;
1654};
1655
1656/* Callback type passed in RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK.
1657 * Called by the frontend in response to keyboard events.
1658 * down is set if the key is being pressed, or false if it is being released.
1659 * keycode is the RETROK value of the char.
1660 * character is the text character of the pressed key. (UTF-32).
1661 * key_modifiers is a set of RETROKMOD values or'ed together.
1662 *
1663 * The pressed/keycode state can be indepedent of the character.
1664 * It is also possible that multiple characters are generated from a
1665 * single keypress.
1666 * Keycode events should be treated separately from character events.
1667 * However, when possible, the frontend should try to synchronize these.
1668 * If only a character is posted, keycode should be RETROK_UNKNOWN.
1669 *
1670 * Similarily if only a keycode event is generated with no corresponding
1671 * character, character should be 0.
1672 */
1673typedef void (*retro_keyboard_event_t)(bool down, unsigned keycode,
1674 uint32_t character, uint16_t key_modifiers);
1675
1676struct retro_keyboard_callback
1677{
1678 retro_keyboard_event_t callback;
1679};
1680
1681/* Callbacks for RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE.
1682 * Should be set for implementations which can swap out multiple disk
1683 * images in runtime.
1684 *
1685 * If the implementation can do this automatically, it should strive to do so.
1686 * However, there are cases where the user must manually do so.
1687 *
1688 * Overview: To swap a disk image, eject the disk image with
1689 * set_eject_state(true).
1690 * Set the disk index with set_image_index(index). Insert the disk again
1691 * with set_eject_state(false).
1692 */
1693
1694/* If ejected is true, "ejects" the virtual disk tray.
1695 * When ejected, the disk image index can be set.
1696 */
1697typedef bool (*retro_set_eject_state_t)(bool ejected);
1698
1699/* Gets current eject state. The initial state is 'not ejected'. */
1700typedef bool (*retro_get_eject_state_t)(void);
1701
1702/* Gets current disk index. First disk is index 0.
1703 * If return value is >= get_num_images(), no disk is currently inserted.
1704 */
1705typedef unsigned (*retro_get_image_index_t)(void);
1706
1707/* Sets image index. Can only be called when disk is ejected.
1708 * The implementation supports setting "no disk" by using an
1709 * index >= get_num_images().
1710 */
1711typedef bool (*retro_set_image_index_t)(unsigned index);
1712
1713/* Gets total number of images which are available to use. */
1714typedef unsigned (*retro_get_num_images_t)(void);
1715
1716struct retro_game_info;
1717
1718/* Replaces the disk image associated with index.
1719 * Arguments to pass in info have same requirements as retro_load_game().
1720 * Virtual disk tray must be ejected when calling this.
1721 *
1722 * Replacing a disk image with info = NULL will remove the disk image
1723 * from the internal list.
1724 * As a result, calls to get_image_index() can change.
1725 *
1726 * E.g. replace_image_index(1, NULL), and previous get_image_index()
1727 * returned 4 before.
1728 * Index 1 will be removed, and the new index is 3.
1729 */
1730typedef bool (*retro_replace_image_index_t)(unsigned index,
1731 const struct retro_game_info *info);
1732
1733/* Adds a new valid index (get_num_images()) to the internal disk list.
1734 * This will increment subsequent return values from get_num_images() by 1.
1735 * This image index cannot be used until a disk image has been set
1736 * with replace_image_index. */
1737typedef bool (*retro_add_image_index_t)(void);
1738
1739struct retro_disk_control_callback
1740{
1741 retro_set_eject_state_t set_eject_state;
1742 retro_get_eject_state_t get_eject_state;
1743
1744 retro_get_image_index_t get_image_index;
1745 retro_set_image_index_t set_image_index;
1746 retro_get_num_images_t get_num_images;
1747
1748 retro_replace_image_index_t replace_image_index;
1749 retro_add_image_index_t add_image_index;
1750};
1751
1752enum retro_pixel_format
1753{
1754 /* 0RGB1555, native endian.
1755 * 0 bit must be set to 0.
1756 * This pixel format is default for compatibility concerns only.
1757 * If a 15/16-bit pixel format is desired, consider using RGB565. */
1758 RETRO_PIXEL_FORMAT_0RGB1555 = 0,
1759
1760 /* XRGB8888, native endian.
1761 * X bits are ignored. */
1762 RETRO_PIXEL_FORMAT_XRGB8888 = 1,
1763
1764 /* RGB565, native endian.
1765 * This pixel format is the recommended format to use if a 15/16-bit
1766 * format is desired as it is the pixel format that is typically
1767 * available on a wide range of low-power devices.
1768 *
1769 * It is also natively supported in APIs like OpenGL ES. */
1770 RETRO_PIXEL_FORMAT_RGB565 = 2,
1771
1772 /* Ensure sizeof() == sizeof(int). */
1773 RETRO_PIXEL_FORMAT_UNKNOWN = INT_MAX
1774};
1775
1776struct retro_message
1777{
1778 const char *msg; /* Message to be displayed. */
1779 unsigned frames; /* Duration in frames of message. */
1780};
1781
1782/* Describes how the libretro implementation maps a libretro input bind
1783 * to its internal input system through a human readable string.
1784 * This string can be used to better let a user configure input. */
1785struct retro_input_descriptor
1786{
1787 /* Associates given parameters with a description. */
1788 unsigned port;
1789 unsigned device;
1790 unsigned index;
1791 unsigned id;
1792
1793 /* Human readable description for parameters.
1794 * The pointer must remain valid until
1795 * retro_unload_game() is called. */
1796 const char *description;
1797};
1798
1799struct retro_system_info
1800{
1801 /* All pointers are owned by libretro implementation, and pointers must
1802 * remain valid until retro_deinit() is called. */
1803
1804 const char *library_name; /* Descriptive name of library. Should not
1805 * contain any version numbers, etc. */
1806 const char *library_version; /* Descriptive version of core. */
1807
1808 const char *valid_extensions; /* A string listing probably content
1809 * extensions the core will be able to
1810 * load, separated with pipe.
1811 * I.e. "bin|rom|iso".
1812 * Typically used for a GUI to filter
1813 * out extensions. */
1814
1815 /* If true, retro_load_game() is guaranteed to provide a valid pathname
1816 * in retro_game_info::path.
1817 * ::data and ::size are both invalid.
1818 *
1819 * If false, ::data and ::size are guaranteed to be valid, but ::path
1820 * might not be valid.
1821 *
1822 * This is typically set to true for libretro implementations that must
1823 * load from file.
1824 * Implementations should strive for setting this to false, as it allows
1825 * the frontend to perform patching, etc. */
1826 bool need_fullpath;
1827
1828 /* If true, the frontend is not allowed to extract any archives before
1829 * loading the real content.
1830 * Necessary for certain libretro implementations that load games
1831 * from zipped archives. */
1832 bool block_extract;
1833};
1834
1835struct retro_game_geometry
1836{
1837 unsigned base_width; /* Nominal video width of game. */
1838 unsigned base_height; /* Nominal video height of game. */
1839 unsigned max_width; /* Maximum possible width of game. */
1840 unsigned max_height; /* Maximum possible height of game. */
1841
1842 float aspect_ratio; /* Nominal aspect ratio of game. If
1843 * aspect_ratio is <= 0.0, an aspect ratio
1844 * of base_width / base_height is assumed.
1845 * A frontend could override this setting,
1846 * if desired. */
1847};
1848
1849struct retro_system_timing
1850{
1851 double fps; /* FPS of video content. */
1852 double sample_rate; /* Sampling rate of audio. */
1853};
1854
1855struct retro_system_av_info
1856{
1857 struct retro_game_geometry geometry;
1858 struct retro_system_timing timing;
1859};
1860
1861struct retro_variable
1862{
1863 /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE.
1864 * If NULL, obtains the complete environment string if more
1865 * complex parsing is necessary.
1866 * The environment string is formatted as key-value pairs
1867 * delimited by semicolons as so:
1868 * "key1=value1;key2=value2;..."
1869 */
1870 const char *key;
1871
1872 /* Value to be obtained. If key does not exist, it is set to NULL. */
1873 const char *value;
1874};
1875
1876struct retro_game_info
1877{
1878 const char *path; /* Path to game, UTF-8 encoded.
1879 * Usually used as a reference.
1880 * May be NULL if rom was loaded from stdin
1881 * or similar.
1882 * retro_system_info::need_fullpath guaranteed
1883 * that this path is valid. */
1884 const void *data; /* Memory buffer of loaded game. Will be NULL
1885 * if need_fullpath was set. */
1886 size_t size; /* Size of memory buffer. */
1887 const char *meta; /* String of implementation specific meta-data. */
1888};
1889
1890#define RETRO_MEMORY_ACCESS_WRITE (1 << 0)
1891 /* The core will write to the buffer provided by retro_framebuffer::data. */
1892#define RETRO_MEMORY_ACCESS_READ (1 << 1)
1893 /* The core will read from retro_framebuffer::data. */
1894#define RETRO_MEMORY_TYPE_CACHED (1 << 0)
1895 /* The memory in data is cached.
1896 * If not cached, random writes and/or reading from the buffer is expected to be very slow. */
1897struct retro_framebuffer
1898{
1899 void *data; /* The framebuffer which the core can render into.
1900 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER.
1901 The initial contents of data are unspecified. */
1902 unsigned width; /* The framebuffer width used by the core. Set by core. */
1903 unsigned height; /* The framebuffer height used by the core. Set by core. */
1904 size_t pitch; /* The number of bytes between the beginning of a scanline,
1905 and beginning of the next scanline.
1906 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
1907 enum retro_pixel_format format; /* The pixel format the core must use to render into data.
1908 This format could differ from the format used in
1909 SET_PIXEL_FORMAT.
1910 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
1911
1912 unsigned access_flags; /* How the core will access the memory in the framebuffer.
1913 RETRO_MEMORY_ACCESS_* flags.
1914 Set by core. */
1915 unsigned memory_flags; /* Flags telling core how the memory has been mapped.
1916 RETRO_MEMORY_TYPE_* flags.
1917 Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */
1918};
1919
1920/* Callbacks */
1921
1922/* Environment callback. Gives implementations a way of performing
1923 * uncommon tasks. Extensible. */
1924typedef bool (*retro_environment_t)(unsigned cmd, void *data);
1925
1926/* Render a frame. Pixel format is 15-bit 0RGB1555 native endian
1927 * unless changed (see RETRO_ENVIRONMENT_SET_PIXEL_FORMAT).
1928 *
1929 * Width and height specify dimensions of buffer.
1930 * Pitch specifices length in bytes between two lines in buffer.
1931 *
1932 * For performance reasons, it is highly recommended to have a frame
1933 * that is packed in memory, i.e. pitch == width * byte_per_pixel.
1934 * Certain graphic APIs, such as OpenGL ES, do not like textures
1935 * that are not packed in memory.
1936 */
1937typedef void (*retro_video_refresh_t)(const void *data, unsigned width,
1938 unsigned height, size_t pitch);
1939
1940/* Renders a single audio frame. Should only be used if implementation
1941 * generates a single sample at a time.
1942 * Format is signed 16-bit native endian.
1943 */
1944typedef void (*retro_audio_sample_t)(int16_t left, int16_t right);
1945
1946/* Renders multiple audio frames in one go.
1947 *
1948 * One frame is defined as a sample of left and right channels, interleaved.
1949 * I.e. int16_t buf[4] = { l, r, l, r }; would be 2 frames.
1950 * Only one of the audio callbacks must ever be used.
1951 */
1952typedef size_t (*retro_audio_sample_batch_t)(const int16_t *data,
1953 size_t frames);
1954
1955/* Polls input. */
1956typedef void (*retro_input_poll_t)(void);
1957
1958/* Queries for input for player 'port'. device will be masked with
1959 * RETRO_DEVICE_MASK.
1960 *
1961 * Specialization of devices such as RETRO_DEVICE_JOYPAD_MULTITAP that
1962 * have been set with retro_set_controller_port_device()
1963 * will still use the higher level RETRO_DEVICE_JOYPAD to request input.
1964 */
1965typedef int16_t (*retro_input_state_t)(unsigned port, unsigned device,
1966 unsigned index, unsigned id);
1967
1968/* Sets callbacks. retro_set_environment() is guaranteed to be called
1969 * before retro_init().
1970 *
1971 * The rest of the set_* functions are guaranteed to have been called
1972 * before the first call to retro_run() is made. */
1973RETRO_API void retro_set_environment(retro_environment_t);
1974RETRO_API void retro_set_video_refresh(retro_video_refresh_t);
1975RETRO_API void retro_set_audio_sample(retro_audio_sample_t);
1976RETRO_API void retro_set_audio_sample_batch(retro_audio_sample_batch_t);
1977RETRO_API void retro_set_input_poll(retro_input_poll_t);
1978RETRO_API void retro_set_input_state(retro_input_state_t);
1979
1980/* Library global initialization/deinitialization. */
1981RETRO_API void retro_init(void);
1982RETRO_API void retro_deinit(void);
1983
1984/* Must return RETRO_API_VERSION. Used to validate ABI compatibility
1985 * when the API is revised. */
1986RETRO_API unsigned retro_api_version(void);
1987
1988/* Gets statically known system info. Pointers provided in *info
1989 * must be statically allocated.
1990 * Can be called at any time, even before retro_init(). */
1991RETRO_API void retro_get_system_info(struct retro_system_info *info);
1992
1993/* Gets information about system audio/video timings and geometry.
1994 * Can be called only after retro_load_game() has successfully completed.
1995 * NOTE: The implementation of this function might not initialize every
1996 * variable if needed.
1997 * E.g. geom.aspect_ratio might not be initialized if core doesn't
1998 * desire a particular aspect ratio. */
1999RETRO_API void retro_get_system_av_info(struct retro_system_av_info *info);
2000
2001/* Sets device to be used for player 'port'.
2002 * By default, RETRO_DEVICE_JOYPAD is assumed to be plugged into all
2003 * available ports.
2004 * Setting a particular device type is not a guarantee that libretro cores
2005 * will only poll input based on that particular device type. It is only a
2006 * hint to the libretro core when a core cannot automatically detect the
2007 * appropriate input device type on its own. It is also relevant when a
2008 * core can change its behavior depending on device type. */
2009RETRO_API void retro_set_controller_port_device(unsigned port, unsigned device);
2010
2011/* Resets the current game. */
2012RETRO_API void retro_reset(void);
2013
2014/* Runs the game for one video frame.
2015 * During retro_run(), input_poll callback must be called at least once.
2016 *
2017 * If a frame is not rendered for reasons where a game "dropped" a frame,
2018 * this still counts as a frame, and retro_run() should explicitly dupe
2019 * a frame if GET_CAN_DUPE returns true.
2020 * In this case, the video callback can take a NULL argument for data.
2021 */
2022RETRO_API void retro_run(void);
2023
2024/* Returns the amount of data the implementation requires to serialize
2025 * internal state (save states).
2026 * Between calls to retro_load_game() and retro_unload_game(), the
2027 * returned size is never allowed to be larger than a previous returned
2028 * value, to ensure that the frontend can allocate a save state buffer once.
2029 */
2030RETRO_API size_t retro_serialize_size(void);
2031
2032/* Serializes internal state. If failed, or size is lower than
2033 * retro_serialize_size(), it should return false, true otherwise. */
2034RETRO_API bool retro_serialize(void *data, size_t size);
2035RETRO_API bool retro_unserialize(const void *data, size_t size);
2036
2037RETRO_API void retro_cheat_reset(void);
2038RETRO_API void retro_cheat_set(unsigned index, bool enabled, const char *code);
2039
2040/* Loads a game. */
2041RETRO_API bool retro_load_game(const struct retro_game_info *game);
2042
2043/* Loads a "special" kind of game. Should not be used,
2044 * except in extreme cases. */
2045RETRO_API bool retro_load_game_special(
2046 unsigned game_type,
2047 const struct retro_game_info *info, size_t num_info
2048);
2049
2050/* Unloads a currently loaded game. */
2051RETRO_API void retro_unload_game(void);
2052
2053/* Gets region of game. */
2054RETRO_API unsigned retro_get_region(void);
2055
2056/* Gets region of memory. */
2057RETRO_API void *retro_get_memory_data(unsigned id);
2058RETRO_API size_t retro_get_memory_size(unsigned id);
2059
2060#ifdef __cplusplus
2061}
2062#endif
2063
2064#endif
ARM optimized PCSX fork