Mercurial > repos > blastem
view libretro.h @ 1987:71732f2f6f42
Fix handling of unmapped reads/writes to the cart/expansion port region
| author | Mike Pavone <pavone@retrodev.com> |
|---|---|
| date | Mon, 01 Jun 2020 23:59:59 -0700 |
| parents | 6c54bb5fe3b3 |
| children |
line wrap: on
line source
/* Copyright (C) 2010-2017 The RetroArch team * * --------------------------------------------------------------------------------------- * The following license statement only applies to this libretro API header (libretro.h). * --------------------------------------------------------------------------------------- * * Permission is hereby granted, free of charge, * to any person obtaining a copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation the rights to * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, * and to permit persons to whom the Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef LIBRETRO_H__ #define LIBRETRO_H__ #include <stdint.h> #include <stddef.h> #include <limits.h> #ifdef __cplusplus extern "C" { #endif #ifndef __cplusplus #if defined(_MSC_VER) && _MSC_VER < 1800 && !defined(SN_TARGET_PS3) /* Hack applied for MSVC when compiling in C89 mode * as it isn't C99-compliant. */ #define bool unsigned char #define true 1 #define false 0 #else #include <stdbool.h> #endif #endif #ifndef RETRO_CALLCONV # if defined(__GNUC__) && defined(__i386__) && !defined(__x86_64__) # define RETRO_CALLCONV __attribute__((cdecl)) # elif defined(_MSC_VER) && defined(_M_X86) && !defined(_M_X64) # define RETRO_CALLCONV __cdecl # else # define RETRO_CALLCONV /* all other platforms only have one calling convention each */ # endif #endif #ifndef RETRO_API # if defined(_WIN32) || defined(__CYGWIN__) || defined(__MINGW32__) # ifdef RETRO_IMPORT_SYMBOLS # ifdef __GNUC__ # define RETRO_API RETRO_CALLCONV __attribute__((__dllimport__)) # else # define RETRO_API RETRO_CALLCONV __declspec(dllimport) # endif # else # ifdef __GNUC__ # define RETRO_API RETRO_CALLCONV __attribute__((__dllexport__)) # else # define RETRO_API RETRO_CALLCONV __declspec(dllexport) # endif # endif # else # if defined(__GNUC__) && __GNUC__ >= 4 && !defined(__CELLOS_LV2__) # define RETRO_API RETRO_CALLCONV __attribute__((__visibility__("default"))) # else # define RETRO_API RETRO_CALLCONV # endif # endif #endif /* Used for checking API/ABI mismatches that can break libretro * implementations. * It is not incremented for compatible changes to the API. */ #define RETRO_API_VERSION 1 /* * Libretro's fundamental device abstractions. * * Libretro's input system consists of some standardized device types, * such as a joypad (with/without analog), mouse, keyboard, lightgun * and a pointer. * * The functionality of these devices are fixed, and individual cores * map their own concept of a controller to libretro's abstractions. * This makes it possible for frontends to map the abstract types to a * real input device, and not having to worry about binding input * correctly to arbitrary controller layouts. */ #define RETRO_DEVICE_TYPE_SHIFT 8 #define RETRO_DEVICE_MASK ((1 << RETRO_DEVICE_TYPE_SHIFT) - 1) #define RETRO_DEVICE_SUBCLASS(base, id) (((id + 1) << RETRO_DEVICE_TYPE_SHIFT) | base) /* Input disabled. */ #define RETRO_DEVICE_NONE 0 /* The JOYPAD is called RetroPad. It is essentially a Super Nintendo * controller, but with additional L2/R2/L3/R3 buttons, similar to a * PS1 DualShock. */ #define RETRO_DEVICE_JOYPAD 1 /* The mouse is a simple mouse, similar to Super Nintendo's mouse. * X and Y coordinates are reported relatively to last poll (poll callback). * It is up to the libretro implementation to keep track of where the mouse * pointer is supposed to be on the screen. * The frontend must make sure not to interfere with its own hardware * mouse pointer. */ #define RETRO_DEVICE_MOUSE 2 /* KEYBOARD device lets one poll for raw key pressed. * It is poll based, so input callback will return with the current * pressed state. * For event/text based keyboard input, see * RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK. */ #define RETRO_DEVICE_KEYBOARD 3 /* LIGHTGUN device is similar to Guncon-2 for PlayStation 2. * It reports X/Y coordinates in screen space (similar to the pointer) * in the range [-0x8000, 0x7fff] in both axes, with zero being center. * As well as reporting on/off screen state. It features a trigger, * start/select buttons, auxiliary action buttons and a * directional pad. A forced off-screen shot can be requested for * auto-reloading function in some games. */ #define RETRO_DEVICE_LIGHTGUN 4 /* The ANALOG device is an extension to JOYPAD (RetroPad). * Similar to DualShock2 it adds two analog sticks and all buttons can * be analog. This is treated as a separate device type as it returns * axis values in the full analog range of [-0x8000, 0x7fff]. * Positive X axis is right. Positive Y axis is down. * Buttons are returned in the range [0, 0x7fff]. * Only use ANALOG type when polling for analog values. */ #define RETRO_DEVICE_ANALOG 5 /* Abstracts the concept of a pointing mechanism, e.g. touch. * This allows libretro to query in absolute coordinates where on the * screen a mouse (or something similar) is being placed. * For a touch centric device, coordinates reported are the coordinates * of the press. * * Coordinates in X and Y are reported as: * [-0x7fff, 0x7fff]: -0x7fff corresponds to the far left/top of the screen, * and 0x7fff corresponds to the far right/bottom of the screen. * The "screen" is here defined as area that is passed to the frontend and * later displayed on the monitor. * * The frontend is free to scale/resize this screen as it sees fit, however, * (X, Y) = (-0x7fff, -0x7fff) will correspond to the top-left pixel of the * game image, etc. * * To check if the pointer coordinates are valid (e.g. a touch display * actually being touched), PRESSED returns 1 or 0. * * If using a mouse on a desktop, PRESSED will usually correspond to the * left mouse button, but this is a frontend decision. * PRESSED will only return 1 if the pointer is inside the game screen. * * For multi-touch, the index variable can be used to successively query * more presses. * If index = 0 returns true for _PRESSED, coordinates can be extracted * with _X, _Y for index = 0. One can then query _PRESSED, _X, _Y with * index = 1, and so on. * Eventually _PRESSED will return false for an index. No further presses * are registered at this point. */ #define RETRO_DEVICE_POINTER 6 /* Buttons for the RetroPad (JOYPAD). * The placement of these is equivalent to placements on the * Super Nintendo controller. * L2/R2/L3/R3 buttons correspond to the PS1 DualShock. * Also used as id values for RETRO_DEVICE_INDEX_ANALOG_BUTTON */ #define RETRO_DEVICE_ID_JOYPAD_B 0 #define RETRO_DEVICE_ID_JOYPAD_Y 1 #define RETRO_DEVICE_ID_JOYPAD_SELECT 2 #define RETRO_DEVICE_ID_JOYPAD_START 3 #define RETRO_DEVICE_ID_JOYPAD_UP 4 #define RETRO_DEVICE_ID_JOYPAD_DOWN 5 #define RETRO_DEVICE_ID_JOYPAD_LEFT 6 #define RETRO_DEVICE_ID_JOYPAD_RIGHT 7 #define RETRO_DEVICE_ID_JOYPAD_A 8 #define RETRO_DEVICE_ID_JOYPAD_X 9 #define RETRO_DEVICE_ID_JOYPAD_L 10 #define RETRO_DEVICE_ID_JOYPAD_R 11 #define RETRO_DEVICE_ID_JOYPAD_L2 12 #define RETRO_DEVICE_ID_JOYPAD_R2 13 #define RETRO_DEVICE_ID_JOYPAD_L3 14 #define RETRO_DEVICE_ID_JOYPAD_R3 15 /* Index / Id values for ANALOG device. */ #define RETRO_DEVICE_INDEX_ANALOG_LEFT 0 #define RETRO_DEVICE_INDEX_ANALOG_RIGHT 1 #define RETRO_DEVICE_INDEX_ANALOG_BUTTON 2 #define RETRO_DEVICE_ID_ANALOG_X 0 #define RETRO_DEVICE_ID_ANALOG_Y 1 /* Id values for MOUSE. */ #define RETRO_DEVICE_ID_MOUSE_X 0 #define RETRO_DEVICE_ID_MOUSE_Y 1 #define RETRO_DEVICE_ID_MOUSE_LEFT 2 #define RETRO_DEVICE_ID_MOUSE_RIGHT 3 #define RETRO_DEVICE_ID_MOUSE_WHEELUP 4 #define RETRO_DEVICE_ID_MOUSE_WHEELDOWN 5 #define RETRO_DEVICE_ID_MOUSE_MIDDLE 6 #define RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELUP 7 #define RETRO_DEVICE_ID_MOUSE_HORIZ_WHEELDOWN 8 #define RETRO_DEVICE_ID_MOUSE_BUTTON_4 9 #define RETRO_DEVICE_ID_MOUSE_BUTTON_5 10 /* Id values for LIGHTGUN. */ #define RETRO_DEVICE_ID_LIGHTGUN_SCREEN_X 13 /*Absolute Position*/ #define RETRO_DEVICE_ID_LIGHTGUN_SCREEN_Y 14 /*Absolute*/ #define RETRO_DEVICE_ID_LIGHTGUN_IS_OFFSCREEN 15 /*Status Check*/ #define RETRO_DEVICE_ID_LIGHTGUN_TRIGGER 2 #define RETRO_DEVICE_ID_LIGHTGUN_RELOAD 16 /*Forced off-screen shot*/ #define RETRO_DEVICE_ID_LIGHTGUN_AUX_A 3 #define RETRO_DEVICE_ID_LIGHTGUN_AUX_B 4 #define RETRO_DEVICE_ID_LIGHTGUN_START 6 #define RETRO_DEVICE_ID_LIGHTGUN_SELECT 7 #define RETRO_DEVICE_ID_LIGHTGUN_AUX_C 8 #define RETRO_DEVICE_ID_LIGHTGUN_DPAD_UP 9 #define RETRO_DEVICE_ID_LIGHTGUN_DPAD_DOWN 10 #define RETRO_DEVICE_ID_LIGHTGUN_DPAD_LEFT 11 #define RETRO_DEVICE_ID_LIGHTGUN_DPAD_RIGHT 12 /* deprecated */ #define RETRO_DEVICE_ID_LIGHTGUN_X 0 /*Relative Position*/ #define RETRO_DEVICE_ID_LIGHTGUN_Y 1 /*Relative*/ #define RETRO_DEVICE_ID_LIGHTGUN_CURSOR 3 /*Use Aux:A*/ #define RETRO_DEVICE_ID_LIGHTGUN_TURBO 4 /*Use Aux:B*/ #define RETRO_DEVICE_ID_LIGHTGUN_PAUSE 5 /*Use Start*/ /* Id values for POINTER. */ #define RETRO_DEVICE_ID_POINTER_X 0 #define RETRO_DEVICE_ID_POINTER_Y 1 #define RETRO_DEVICE_ID_POINTER_PRESSED 2 /* Returned from retro_get_region(). */ #define RETRO_REGION_NTSC 0 #define RETRO_REGION_PAL 1 /* Id values for LANGUAGE */ enum retro_language { RETRO_LANGUAGE_ENGLISH = 0, RETRO_LANGUAGE_JAPANESE = 1, RETRO_LANGUAGE_FRENCH = 2, RETRO_LANGUAGE_SPANISH = 3, RETRO_LANGUAGE_GERMAN = 4, RETRO_LANGUAGE_ITALIAN = 5, RETRO_LANGUAGE_DUTCH = 6, RETRO_LANGUAGE_PORTUGUESE_BRAZIL = 7, RETRO_LANGUAGE_PORTUGUESE_PORTUGAL = 8, RETRO_LANGUAGE_RUSSIAN = 9, RETRO_LANGUAGE_KOREAN = 10, RETRO_LANGUAGE_CHINESE_TRADITIONAL = 11, RETRO_LANGUAGE_CHINESE_SIMPLIFIED = 12, RETRO_LANGUAGE_ESPERANTO = 13, RETRO_LANGUAGE_POLISH = 14, RETRO_LANGUAGE_VIETNAMESE = 15, RETRO_LANGUAGE_ARABIC = 16, RETRO_LANGUAGE_LAST, /* Ensure sizeof(enum) == sizeof(int) */ RETRO_LANGUAGE_DUMMY = INT_MAX }; /* Passed to retro_get_memory_data/size(). * If the memory type doesn't apply to the * implementation NULL/0 can be returned. */ #define RETRO_MEMORY_MASK 0xff /* Regular save RAM. This RAM is usually found on a game cartridge, * backed up by a battery. * If save game data is too complex for a single memory buffer, * the SAVE_DIRECTORY (preferably) or SYSTEM_DIRECTORY environment * callback can be used. */ #define RETRO_MEMORY_SAVE_RAM 0 /* Some games have a built-in clock to keep track of time. * This memory is usually just a couple of bytes to keep track of time. */ #define RETRO_MEMORY_RTC 1 /* System ram lets a frontend peek into a game systems main RAM. */ #define RETRO_MEMORY_SYSTEM_RAM 2 /* Video ram lets a frontend peek into a game systems video RAM (VRAM). */ #define RETRO_MEMORY_VIDEO_RAM 3 /* Keysyms used for ID in input state callback when polling RETRO_KEYBOARD. */ enum retro_key { RETROK_UNKNOWN = 0, RETROK_FIRST = 0, RETROK_BACKSPACE = 8, RETROK_TAB = 9, RETROK_CLEAR = 12, RETROK_RETURN = 13, RETROK_PAUSE = 19, RETROK_ESCAPE = 27, RETROK_SPACE = 32, RETROK_EXCLAIM = 33, RETROK_QUOTEDBL = 34, RETROK_HASH = 35, RETROK_DOLLAR = 36, RETROK_AMPERSAND = 38, RETROK_QUOTE = 39, RETROK_LEFTPAREN = 40, RETROK_RIGHTPAREN = 41, RETROK_ASTERISK = 42, RETROK_PLUS = 43, RETROK_COMMA = 44, RETROK_MINUS = 45, RETROK_PERIOD = 46, RETROK_SLASH = 47, RETROK_0 = 48, RETROK_1 = 49, RETROK_2 = 50, RETROK_3 = 51, RETROK_4 = 52, RETROK_5 = 53, RETROK_6 = 54, RETROK_7 = 55, RETROK_8 = 56, RETROK_9 = 57, RETROK_COLON = 58, RETROK_SEMICOLON = 59, RETROK_LESS = 60, RETROK_EQUALS = 61, RETROK_GREATER = 62, RETROK_QUESTION = 63, RETROK_AT = 64, RETROK_LEFTBRACKET = 91, RETROK_BACKSLASH = 92, RETROK_RIGHTBRACKET = 93, RETROK_CARET = 94, RETROK_UNDERSCORE = 95, RETROK_BACKQUOTE = 96, RETROK_a = 97, RETROK_b = 98, RETROK_c = 99, RETROK_d = 100, RETROK_e = 101, RETROK_f = 102, RETROK_g = 103, RETROK_h = 104, RETROK_i = 105, RETROK_j = 106, RETROK_k = 107, RETROK_l = 108, RETROK_m = 109, RETROK_n = 110, RETROK_o = 111, RETROK_p = 112, RETROK_q = 113, RETROK_r = 114, RETROK_s = 115, RETROK_t = 116, RETROK_u = 117, RETROK_v = 118, RETROK_w = 119, RETROK_x = 120, RETROK_y = 121, RETROK_z = 122, RETROK_LEFTBRACE = 123, RETROK_BAR = 124, RETROK_RIGHTBRACE = 125, RETROK_TILDE = 126, RETROK_DELETE = 127, RETROK_KP0 = 256, RETROK_KP1 = 257, RETROK_KP2 = 258, RETROK_KP3 = 259, RETROK_KP4 = 260, RETROK_KP5 = 261, RETROK_KP6 = 262, RETROK_KP7 = 263, RETROK_KP8 = 264, RETROK_KP9 = 265, RETROK_KP_PERIOD = 266, RETROK_KP_DIVIDE = 267, RETROK_KP_MULTIPLY = 268, RETROK_KP_MINUS = 269, RETROK_KP_PLUS = 270, RETROK_KP_ENTER = 271, RETROK_KP_EQUALS = 272, RETROK_UP = 273, RETROK_DOWN = 274, RETROK_RIGHT = 275, RETROK_LEFT = 276, RETROK_INSERT = 277, RETROK_HOME = 278, RETROK_END = 279, RETROK_PAGEUP = 280, RETROK_PAGEDOWN = 281, RETROK_F1 = 282, RETROK_F2 = 283, RETROK_F3 = 284, RETROK_F4 = 285, RETROK_F5 = 286, RETROK_F6 = 287, RETROK_F7 = 288, RETROK_F8 = 289, RETROK_F9 = 290, RETROK_F10 = 291, RETROK_F11 = 292, RETROK_F12 = 293, RETROK_F13 = 294, RETROK_F14 = 295, RETROK_F15 = 296, RETROK_NUMLOCK = 300, RETROK_CAPSLOCK = 301, RETROK_SCROLLOCK = 302, RETROK_RSHIFT = 303, RETROK_LSHIFT = 304, RETROK_RCTRL = 305, RETROK_LCTRL = 306, RETROK_RALT = 307, RETROK_LALT = 308, RETROK_RMETA = 309, RETROK_LMETA = 310, RETROK_LSUPER = 311, RETROK_RSUPER = 312, RETROK_MODE = 313, RETROK_COMPOSE = 314, RETROK_HELP = 315, RETROK_PRINT = 316, RETROK_SYSREQ = 317, RETROK_BREAK = 318, RETROK_MENU = 319, RETROK_POWER = 320, RETROK_EURO = 321, RETROK_UNDO = 322, RETROK_LAST, RETROK_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */ }; enum retro_mod { RETROKMOD_NONE = 0x0000, RETROKMOD_SHIFT = 0x01, RETROKMOD_CTRL = 0x02, RETROKMOD_ALT = 0x04, RETROKMOD_META = 0x08, RETROKMOD_NUMLOCK = 0x10, RETROKMOD_CAPSLOCK = 0x20, RETROKMOD_SCROLLOCK = 0x40, RETROKMOD_DUMMY = INT_MAX /* Ensure sizeof(enum) == sizeof(int) */ }; /* If set, this call is not part of the public libretro API yet. It can * change or be removed at any time. */ #define RETRO_ENVIRONMENT_EXPERIMENTAL 0x10000 /* Environment callback to be used internally in frontend. */ #define RETRO_ENVIRONMENT_PRIVATE 0x20000 /* Environment commands. */ #define RETRO_ENVIRONMENT_SET_ROTATION 1 /* const unsigned * -- * Sets screen rotation of graphics. * Is only implemented if rotation can be accelerated by hardware. * Valid values are 0, 1, 2, 3, which rotates screen by 0, 90, 180, * 270 degrees counter-clockwise respectively. */ #define RETRO_ENVIRONMENT_GET_OVERSCAN 2 /* bool * -- * Boolean value whether or not the implementation should use overscan, * or crop away overscan. */ #define RETRO_ENVIRONMENT_GET_CAN_DUPE 3 /* bool * -- * Boolean value whether or not frontend supports frame duping, * passing NULL to video frame callback. */ /* Environ 4, 5 are no longer supported (GET_VARIABLE / SET_VARIABLES), * and reserved to avoid possible ABI clash. */ #define RETRO_ENVIRONMENT_SET_MESSAGE 6 /* const struct retro_message * -- * Sets a message to be displayed in implementation-specific manner * for a certain amount of 'frames'. * Should not be used for trivial messages, which should simply be * logged via RETRO_ENVIRONMENT_GET_LOG_INTERFACE (or as a * fallback, stderr). */ #define RETRO_ENVIRONMENT_SHUTDOWN 7 /* N/A (NULL) -- * Requests the frontend to shutdown. * Should only be used if game has a specific * way to shutdown the game from a menu item or similar. */ #define RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL 8 /* const unsigned * -- * Gives a hint to the frontend how demanding this implementation * is on a system. E.g. reporting a level of 2 means * this implementation should run decently on all frontends * of level 2 and up. * * It can be used by the frontend to potentially warn * about too demanding implementations. * * The levels are "floating". * * This function can be called on a per-game basis, * as certain games an implementation can play might be * particularly demanding. * If called, it should be called in retro_load_game(). */ #define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9 /* const char ** -- * Returns the "system" directory of the frontend. * This directory can be used to store system specific * content such as BIOSes, configuration data, etc. * The returned value can be NULL. * If so, no such directory is defined, * and it's up to the implementation to find a suitable directory. * * NOTE: Some cores used this folder also for "save" data such as * memory cards, etc, for lack of a better place to put it. * This is now discouraged, and if possible, cores should try to * use the new GET_SAVE_DIRECTORY. */ #define RETRO_ENVIRONMENT_SET_PIXEL_FORMAT 10 /* const enum retro_pixel_format * -- * Sets the internal pixel format used by the implementation. * The default pixel format is RETRO_PIXEL_FORMAT_0RGB1555. * This pixel format however, is deprecated (see enum retro_pixel_format). * If the call returns false, the frontend does not support this pixel * format. * * This function should be called inside retro_load_game() or * retro_get_system_av_info(). */ #define RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS 11 /* const struct retro_input_descriptor * -- * Sets an array of retro_input_descriptors. * It is up to the frontend to present this in a usable way. * The array is terminated by retro_input_descriptor::description * being set to NULL. * This function can be called at any time, but it is recommended * to call it as early as possible. */ #define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12 /* const struct retro_keyboard_callback * -- * Sets a callback function used to notify core about keyboard events. */ #define RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE 13 /* const struct retro_disk_control_callback * -- * Sets an interface which frontend can use to eject and insert * disk images. * This is used for games which consist of multiple images and * must be manually swapped out by the user (e.g. PSX). */ #define RETRO_ENVIRONMENT_SET_HW_RENDER 14 /* struct retro_hw_render_callback * -- * Sets an interface to let a libretro core render with * hardware acceleration. * Should be called in retro_load_game(). * If successful, libretro cores will be able to render to a * frontend-provided framebuffer. * The size of this framebuffer will be at least as large as * max_width/max_height provided in get_av_info(). * If HW rendering is used, pass only RETRO_HW_FRAME_BUFFER_VALID or * NULL to retro_video_refresh_t. */ #define RETRO_ENVIRONMENT_GET_VARIABLE 15 /* struct retro_variable * -- * Interface to acquire user-defined information from environment * that cannot feasibly be supported in a multi-system way. * 'key' should be set to a key which has already been set by * SET_VARIABLES. * 'data' will be set to a value or NULL. */ #define RETRO_ENVIRONMENT_SET_VARIABLES 16 /* const struct retro_variable * -- * Allows an implementation to signal the environment * which variables it might want to check for later using * GET_VARIABLE. * This allows the frontend to present these variables to * a user dynamically. * This should be called as early as possible (ideally in * retro_set_environment). * * 'data' points to an array of retro_variable structs * terminated by a { NULL, NULL } element. * retro_variable::key should be namespaced to not collide * with other implementations' keys. E.g. A core called * 'foo' should use keys named as 'foo_option'. * retro_variable::value should contain a human readable * description of the key as well as a '|' delimited list * of expected values. * * The number of possible options should be very limited, * i.e. it should be feasible to cycle through options * without a keyboard. * * First entry should be treated as a default. * * Example entry: * { "foo_option", "Speed hack coprocessor X; false|true" } * * Text before first ';' is description. This ';' must be * followed by a space, and followed by a list of possible * values split up with '|'. * * Only strings are operated on. The possible values will * generally be displayed and stored as-is by the frontend. */ #define RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE 17 /* bool * -- * Result is set to true if some variables are updated by * frontend since last call to RETRO_ENVIRONMENT_GET_VARIABLE. * Variables should be queried with GET_VARIABLE. */ #define RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME 18 /* const bool * -- * If true, the libretro implementation supports calls to * retro_load_game() with NULL as argument. * Used by cores which can run without particular game data. * This should be called within retro_set_environment() only. */ #define RETRO_ENVIRONMENT_GET_LIBRETRO_PATH 19 /* const char ** -- * Retrieves the absolute path from where this libretro * implementation was loaded. * NULL is returned if the libretro was loaded statically * (i.e. linked statically to frontend), or if the path cannot be * determined. * Mostly useful in cooperation with SET_SUPPORT_NO_GAME as assets can * be loaded without ugly hacks. */ /* Environment 20 was an obsolete version of SET_AUDIO_CALLBACK. * It was not used by any known core at the time, * and was removed from the API. */ #define RETRO_ENVIRONMENT_SET_AUDIO_CALLBACK 22 /* const struct retro_audio_callback * -- * Sets an interface which is used to notify a libretro core about audio * being available for writing. * The callback can be called from any thread, so a core using this must * have a thread safe audio implementation. * It is intended for games where audio and video are completely * asynchronous and audio can be generated on the fly. * This interface is not recommended for use with emulators which have * highly synchronous audio. * * The callback only notifies about writability; the libretro core still * has to call the normal audio callbacks * to write audio. The audio callbacks must be called from within the * notification callback. * The amount of audio data to write is up to the implementation. * Generally, the audio callback will be called continously in a loop. * * Due to thread safety guarantees and lack of sync between audio and * video, a frontend can selectively disallow this interface based on * internal configuration. A core using this interface must also * implement the "normal" audio interface. * * A libretro core using SET_AUDIO_CALLBACK should also make use of * SET_FRAME_TIME_CALLBACK. */ #define RETRO_ENVIRONMENT_SET_FRAME_TIME_CALLBACK 21 /* const struct retro_frame_time_callback * -- * Lets the core know how much time has passed since last * invocation of retro_run(). * The frontend can tamper with the timing to fake fast-forward, * slow-motion, frame stepping, etc. * In this case the delta time will use the reference value * in frame_time_callback.. */ #define RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE 23 /* struct retro_rumble_interface * -- * Gets an interface which is used by a libretro core to set * state of rumble motors in controllers. * A strong and weak motor is supported, and they can be * controlled indepedently. */ #define RETRO_ENVIRONMENT_GET_INPUT_DEVICE_CAPABILITIES 24 /* uint64_t * -- * Gets a bitmask telling which device type are expected to be * handled properly in a call to retro_input_state_t. * Devices which are not handled or recognized always return * 0 in retro_input_state_t. * Example bitmask: caps = (1 << RETRO_DEVICE_JOYPAD) | (1 << RETRO_DEVICE_ANALOG). * Should only be called in retro_run(). */ #define RETRO_ENVIRONMENT_GET_SENSOR_INTERFACE (25 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* struct retro_sensor_interface * -- * Gets access to the sensor interface. * The purpose of this interface is to allow * setting state related to sensors such as polling rate, * enabling/disable it entirely, etc. * Reading sensor state is done via the normal * input_state_callback API. */ #define RETRO_ENVIRONMENT_GET_CAMERA_INTERFACE (26 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* struct retro_camera_callback * -- * Gets an interface to a video camera driver. * A libretro core can use this interface to get access to a * video camera. * New video frames are delivered in a callback in same * thread as retro_run(). * * GET_CAMERA_INTERFACE should be called in retro_load_game(). * * Depending on the camera implementation used, camera frames * will be delivered as a raw framebuffer, * or as an OpenGL texture directly. * * The core has to tell the frontend here which types of * buffers can be handled properly. * An OpenGL texture can only be handled when using a * libretro GL core (SET_HW_RENDER). * It is recommended to use a libretro GL core when * using camera interface. * * The camera is not started automatically. The retrieved start/stop * functions must be used to explicitly * start and stop the camera driver. */ #define RETRO_ENVIRONMENT_GET_LOG_INTERFACE 27 /* struct retro_log_callback * -- * Gets an interface for logging. This is useful for * logging in a cross-platform way * as certain platforms cannot use stderr for logging. * It also allows the frontend to * show logging information in a more suitable way. * If this interface is not used, libretro cores should * log to stderr as desired. */ #define RETRO_ENVIRONMENT_GET_PERF_INTERFACE 28 /* struct retro_perf_callback * -- * Gets an interface for performance counters. This is useful * for performance logging in a cross-platform way and for detecting * architecture-specific features, such as SIMD support. */ #define RETRO_ENVIRONMENT_GET_LOCATION_INTERFACE 29 /* struct retro_location_callback * -- * Gets access to the location interface. * The purpose of this interface is to be able to retrieve * location-based information from the host device, * such as current latitude / longitude. */ #define RETRO_ENVIRONMENT_GET_CONTENT_DIRECTORY 30 /* Old name, kept for compatibility. */ #define RETRO_ENVIRONMENT_GET_CORE_ASSETS_DIRECTORY 30 /* const char ** -- * Returns the "core assets" directory of the frontend. * This directory can be used to store specific assets that the * core relies upon, such as art assets, * input data, etc etc. * The returned value can be NULL. * If so, no such directory is defined, * and it's up to the implementation to find a suitable directory. */ #define RETRO_ENVIRONMENT_GET_SAVE_DIRECTORY 31 /* const char ** -- * Returns the "save" directory of the frontend. * This directory can be used to store SRAM, memory cards, * high scores, etc, if the libretro core * cannot use the regular memory interface (retro_get_memory_data()). * * NOTE: libretro cores used to check GET_SYSTEM_DIRECTORY for * similar things before. * They should still check GET_SYSTEM_DIRECTORY if they want to * be backwards compatible. * The path here can be NULL. It should only be non-NULL if the * frontend user has set a specific save path. */ #define RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO 32 /* const struct retro_system_av_info * -- * Sets a new av_info structure. This can only be called from * within retro_run(). * This should *only* be used if the core is completely altering the * internal resolutions, aspect ratios, timings, sampling rate, etc. * Calling this can require a full reinitialization of video/audio * drivers in the frontend, * * so it is important to call it very sparingly, and usually only with * the users explicit consent. * An eventual driver reinitialize will happen so that video and * audio callbacks * happening after this call within the same retro_run() call will * target the newly initialized driver. * * This callback makes it possible to support configurable resolutions * in games, which can be useful to * avoid setting the "worst case" in max_width/max_height. * * ***HIGHLY RECOMMENDED*** Do not call this callback every time * resolution changes in an emulator core if it's * expected to be a temporary change, for the reasons of possible * driver reinitialization. * This call is not a free pass for not trying to provide * correct values in retro_get_system_av_info(). If you need to change * things like aspect ratio or nominal width/height, * use RETRO_ENVIRONMENT_SET_GEOMETRY, which is a softer variant * of SET_SYSTEM_AV_INFO. * * If this returns false, the frontend does not acknowledge a * changed av_info struct. */ #define RETRO_ENVIRONMENT_SET_PROC_ADDRESS_CALLBACK 33 /* const struct retro_get_proc_address_interface * -- * Allows a libretro core to announce support for the * get_proc_address() interface. * This interface allows for a standard way to extend libretro where * use of environment calls are too indirect, * e.g. for cases where the frontend wants to call directly into the core. * * If a core wants to expose this interface, SET_PROC_ADDRESS_CALLBACK * **MUST** be called from within retro_set_environment(). */ #define RETRO_ENVIRONMENT_SET_SUBSYSTEM_INFO 34 /* const struct retro_subsystem_info * -- * This environment call introduces the concept of libretro "subsystems". * A subsystem is a variant of a libretro core which supports * different kinds of games. * The purpose of this is to support e.g. emulators which might * have special needs, e.g. Super Nintendo's Super GameBoy, Sufami Turbo. * It can also be used to pick among subsystems in an explicit way * if the libretro implementation is a multi-system emulator itself. * * Loading a game via a subsystem is done with retro_load_game_special(), * and this environment call allows a libretro core to expose which * subsystems are supported for use with retro_load_game_special(). * A core passes an array of retro_game_special_info which is terminated * with a zeroed out retro_game_special_info struct. * * If a core wants to use this functionality, SET_SUBSYSTEM_INFO * **MUST** be called from within retro_set_environment(). */ #define RETRO_ENVIRONMENT_SET_CONTROLLER_INFO 35 /* const struct retro_controller_info * -- * This environment call lets a libretro core tell the frontend * which controller types are recognized in calls to * retro_set_controller_port_device(). * * Some emulators such as Super Nintendo * support multiple lightgun types which must be specifically * selected from. * It is therefore sometimes necessary for a frontend to be able * to tell the core about a special kind of input device which is * not covered by the libretro input API. * * In order for a frontend to understand the workings of an input device, * it must be a specialized type * of the generic device types already defined in the libretro API. * * Which devices are supported can vary per input port. * The core must pass an array of const struct retro_controller_info which * is terminated with a blanked out struct. Each element of the struct * corresponds to an ascending port index to * retro_set_controller_port_device(). * Even if special device types are set in the libretro core, * libretro should only poll input based on the base input device types. */ #define RETRO_ENVIRONMENT_SET_MEMORY_MAPS (36 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* const struct retro_memory_map * -- * This environment call lets a libretro core tell the frontend * about the memory maps this core emulates. * This can be used to implement, for example, cheats in a core-agnostic way. * * Should only be used by emulators; it doesn't make much sense for * anything else. * It is recommended to expose all relevant pointers through * retro_get_memory_* as well. * * Can be called from retro_init and retro_load_game. */ #define RETRO_ENVIRONMENT_SET_GEOMETRY 37 /* const struct retro_game_geometry * -- * This environment call is similar to SET_SYSTEM_AV_INFO for changing * video parameters, but provides a guarantee that drivers will not be * reinitialized. * This can only be called from within retro_run(). * * The purpose of this call is to allow a core to alter nominal * width/heights as well as aspect ratios on-the-fly, which can be * useful for some emulators to change in run-time. * * max_width/max_height arguments are ignored and cannot be changed * with this call as this could potentially require a reinitialization or a * non-constant time operation. * If max_width/max_height are to be changed, SET_SYSTEM_AV_INFO is required. * * A frontend must guarantee that this environment call completes in * constant time. */ #define RETRO_ENVIRONMENT_GET_USERNAME 38 /* const char ** * Returns the specified username of the frontend, if specified by the user. * This username can be used as a nickname for a core that has online facilities * or any other mode where personalization of the user is desirable. * The returned value can be NULL. * If this environ callback is used by a core that requires a valid username, * a default username should be specified by the core. */ #define RETRO_ENVIRONMENT_GET_LANGUAGE 39 /* unsigned * -- * Returns the specified language of the frontend, if specified by the user. * It can be used by the core for localization purposes. */ #define RETRO_ENVIRONMENT_GET_CURRENT_SOFTWARE_FRAMEBUFFER (40 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* struct retro_framebuffer * -- * Returns a preallocated framebuffer which the core can use for rendering * the frame into when not using SET_HW_RENDER. * The framebuffer returned from this call must not be used * after the current call to retro_run() returns. * * The goal of this call is to allow zero-copy behavior where a core * can render directly into video memory, avoiding extra bandwidth cost by copying * memory from core to video memory. * * If this call succeeds and the core renders into it, * the framebuffer pointer and pitch can be passed to retro_video_refresh_t. * If the buffer from GET_CURRENT_SOFTWARE_FRAMEBUFFER is to be used, * the core must pass the exact * same pointer as returned by GET_CURRENT_SOFTWARE_FRAMEBUFFER; * i.e. passing a pointer which is offset from the * buffer is undefined. The width, height and pitch parameters * must also match exactly to the values obtained from GET_CURRENT_SOFTWARE_FRAMEBUFFER. * * It is possible for a frontend to return a different pixel format * than the one used in SET_PIXEL_FORMAT. This can happen if the frontend * needs to perform conversion. * * It is still valid for a core to render to a different buffer * even if GET_CURRENT_SOFTWARE_FRAMEBUFFER succeeds. * * A frontend must make sure that the pointer obtained from this function is * writeable (and readable). */ #define RETRO_ENVIRONMENT_SET_HW_SHARED_CONTEXT (44 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* N/A (null) * -- * The frontend will try to use a 'shared' hardware context (mostly applicable * to OpenGL) when a hardware context is being set up. * * Returns true if the frontend supports shared hardware contexts and false * if the frontend does not support shared hardware contexts. * * This will do nothing on its own until SET_HW_RENDER env callbacks are * being used. */ #define RETRO_ENVIRONMENT_GET_VFS_INTERFACE (45 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* struct retro_vfs_interface_info * -- * Gets access to the VFS interface. * VFS presence needs to be queried prior to load_game or any * get_system/save/other_directory being called to let front end know * core supports VFS before it starts handing out paths. * It is recomended to do so in retro_set_environment */ /* VFS functionality */ /* File paths: * File paths passed as parameters when using this api shall be well formed unix-style, * using "/" (unquoted forward slash) as directory separator regardless of the platform's native separator. * Paths shall also include at least one forward slash ("game.bin" is an invalid path, use "./game.bin" instead). * Other than the directory separator, cores shall not make assumptions about path format: * "C:/path/game.bin", "http://example.com/game.bin", "#game/game.bin", "./game.bin" (without quotes) are all valid paths. * Cores may replace the basename or remove path components from the end, and/or add new components; * however, cores shall not append "./", "../" or multiple consecutive forward slashes ("//") to paths they request to front end. * The frontend is encouraged to make such paths work as well as it can, but is allowed to give up if the core alters paths too much. * Frontends are encouraged, but not required, to support native file system paths (modulo replacing the directory separator, if applicable). * Cores are allowed to try using them, but must remain functional if the front rejects such requests. * Cores are encouraged to use the libretro-common filestream functions for file I/O, * as they seamlessly integrate with VFS, deal with directory separator replacement as appropriate * and provide platform-specific fallbacks in cases where front ends do not support VFS. */ /* Opaque file handle * Introduced in VFS API v1 */ struct retro_vfs_file_handle; /* File open flags * Introduced in VFS API v1 */ #define RETRO_VFS_FILE_ACCESS_READ (1 << 0) /* Read only mode */ #define RETRO_VFS_FILE_ACCESS_WRITE (1 << 1) /* Write only mode, discard contents and overwrites existing file unless RETRO_VFS_FILE_ACCESS_UPDATE is also specified */ #define RETRO_VFS_FILE_ACCESS_READ_WRITE (RETRO_VFS_FILE_ACCESS_READ | RETRO_VFS_FILE_ACCESS_WRITE) /* Read-write mode, discard contents and overwrites existing file unless RETRO_VFS_FILE_ACCESS_UPDATE is also specified*/ #define RETRO_VFS_FILE_ACCESS_UPDATE_EXISTING (1 << 2) /* Prevents discarding content of existing files opened for writing */ /* These are only hints. The frontend may choose to ignore them. Other than RAM/CPU/etc use, and how they react to unlikely external interference (for example someone else writing to that file, or the file's server going down), behavior will not change. */ #define RETRO_VFS_FILE_ACCESS_HINT_NONE (0) /* Indicate that the file will be accessed many times. The frontend should aggressively cache everything. */ #define RETRO_VFS_FILE_ACCESS_HINT_FREQUENT_ACCESS (1 << 0) /* Seek positions */ #define RETRO_VFS_SEEK_POSITION_START 0 #define RETRO_VFS_SEEK_POSITION_CURRENT 1 #define RETRO_VFS_SEEK_POSITION_END 2 /* Get path from opaque handle. Returns the exact same path passed to file_open when getting the handle * Introduced in VFS API v1 */ typedef const char *(RETRO_CALLCONV *retro_vfs_get_path_t)(struct retro_vfs_file_handle *stream); /* Open a file for reading or writing. If path points to a directory, this will * fail. Returns the opaque file handle, or NULL for error. * Introduced in VFS API v1 */ typedef struct retro_vfs_file_handle *(RETRO_CALLCONV *retro_vfs_open_t)(const char *path, unsigned mode, unsigned hints); /* Close the file and release its resources. Must be called if open_file returns non-NULL. Returns 0 on succes, -1 on failure. * Whether the call succeeds ot not, the handle passed as parameter becomes invalid and should no longer be used. * Introduced in VFS API v1 */ typedef int (RETRO_CALLCONV *retro_vfs_close_t)(struct retro_vfs_file_handle *stream); /* Return the size of the file in bytes, or -1 for error. * Introduced in VFS API v1 */ typedef int64_t (RETRO_CALLCONV *retro_vfs_size_t)(struct retro_vfs_file_handle *stream); /* Get the current read / write position for the file. Returns - 1 for error. * Introduced in VFS API v1 */ typedef int64_t (RETRO_CALLCONV *retro_vfs_tell_t)(struct retro_vfs_file_handle *stream); /* Set the current read/write position for the file. Returns the new position, -1 for error. * Introduced in VFS API v1 */ typedef int64_t (RETRO_CALLCONV *retro_vfs_seek_t)(struct retro_vfs_file_handle *stream, int64_t offset, int seek_position); /* Read data from a file. Returns the number of bytes read, or -1 for error. * Introduced in VFS API v1 */ typedef int64_t (RETRO_CALLCONV *retro_vfs_read_t)(struct retro_vfs_file_handle *stream, void *s, uint64_t len); /* Write data to a file. Returns the number of bytes written, or -1 for error. * Introduced in VFS API v1 */ typedef int64_t (RETRO_CALLCONV *retro_vfs_write_t)(struct retro_vfs_file_handle *stream, const void *s, uint64_t len); /* Flush pending writes to file, if using buffered IO. Returns 0 on sucess, or -1 on failure. * Introduced in VFS API v1 */ typedef int (RETRO_CALLCONV *retro_vfs_flush_t)(struct retro_vfs_file_handle *stream); /* Delete the specified file. Returns 0 on success, -1 on failure * Introduced in VFS API v1 */ typedef int (RETRO_CALLCONV *retro_vfs_remove_t)(const char *path); /* Rename the specified file. Returns 0 on success, -1 on failure * Introduced in VFS API v1 */ typedef int (RETRO_CALLCONV *retro_vfs_rename_t)(const char *old_path, const char *new_path); struct retro_vfs_interface { retro_vfs_get_path_t get_path; retro_vfs_open_t open; retro_vfs_close_t close; retro_vfs_size_t size; retro_vfs_tell_t tell; retro_vfs_seek_t seek; retro_vfs_read_t read; retro_vfs_write_t write; retro_vfs_flush_t flush; retro_vfs_remove_t remove; retro_vfs_rename_t rename; }; struct retro_vfs_interface_info { /* Set by core: should this be higher than the version the front end supports, * front end will return false in the RETRO_ENVIRONMENT_GET_VFS_INTERFACE call * Introduced in VFS API v1 */ uint32_t required_interface_version; /* Frontend writes interface pointer here. The frontend also sets the actual * version, must be at least required_interface_version. * Introduced in VFS API v1 */ struct retro_vfs_interface *iface; }; enum retro_hw_render_interface_type { RETRO_HW_RENDER_INTERFACE_VULKAN = 0, RETRO_HW_RENDER_INTERFACE_DUMMY = INT_MAX }; /* Base struct. All retro_hw_render_interface_* types * contain at least these fields. */ struct retro_hw_render_interface { enum retro_hw_render_interface_type interface_type; unsigned interface_version; }; #define RETRO_ENVIRONMENT_GET_LED_INTERFACE (46 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* struct retro_led_interface * -- * Gets an interface which is used by a libretro core to set * state of LEDs. */ typedef void (RETRO_CALLCONV *retro_set_led_state_t)(int led, int state); struct retro_led_interface { retro_set_led_state_t set_led_state; }; #define RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE (41 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* const struct retro_hw_render_interface ** -- * Returns an API specific rendering interface for accessing API specific data. * Not all HW rendering APIs support or need this. * The contents of the returned pointer is specific to the rendering API * being used. See the various headers like libretro_vulkan.h, etc. * * GET_HW_RENDER_INTERFACE cannot be called before context_reset has been called. * Similarly, after context_destroyed callback returns, * the contents of the HW_RENDER_INTERFACE are invalidated. */ #define RETRO_ENVIRONMENT_SET_SUPPORT_ACHIEVEMENTS (42 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* const bool * -- * If true, the libretro implementation supports achievements * either via memory descriptors set with RETRO_ENVIRONMENT_SET_MEMORY_MAPS * or via retro_get_memory_data/retro_get_memory_size. * * This must be called before the first call to retro_run. */ enum retro_hw_render_context_negotiation_interface_type { RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_VULKAN = 0, RETRO_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE_DUMMY = INT_MAX }; /* Base struct. All retro_hw_render_context_negotiation_interface_* types * contain at least these fields. */ struct retro_hw_render_context_negotiation_interface { enum retro_hw_render_context_negotiation_interface_type interface_type; unsigned interface_version; }; #define RETRO_ENVIRONMENT_SET_HW_RENDER_CONTEXT_NEGOTIATION_INTERFACE (43 | RETRO_ENVIRONMENT_EXPERIMENTAL) /* const struct retro_hw_render_context_negotiation_interface * -- * Sets an interface which lets the libretro core negotiate with frontend how a context is created. * The semantics of this interface depends on which API is used in SET_HW_RENDER earlier. * This interface will be used when the frontend is trying to create a HW rendering context, * so it will be used after SET_HW_RENDER, but before the context_reset callback. */ /* Serialized state is incomplete in some way. Set if serialization is * usable in typical end-user cases but should not be relied upon to * implement frame-sensitive frontend features such as netplay or * rerecording. */ #define RETRO_SERIALIZATION_QUIRK_INCOMPLETE (1 << 0) /* The core must spend some time initializing before serialization is * supported. retro_serialize() will initially fail; retro_unserialize() * and retro_serialize_size() may or may not work correctly either. */ #define RETRO_SERIALIZATION_QUIRK_MUST_INITIALIZE (1 << 1) /* Serialization size may change within a session. */ #define RETRO_SERIALIZATION_QUIRK_CORE_VARIABLE_SIZE (1 << 2) /* Set by the frontend to acknowledge that it supports variable-sized * states. */ #define RETRO_SERIALIZATION_QUIRK_FRONT_VARIABLE_SIZE (1 << 3) /* Serialized state can only be loaded during the same session. */ #define RETRO_SERIALIZATION_QUIRK_SINGLE_SESSION (1 << 4) /* Serialized state cannot be loaded on an architecture with a different * endianness from the one it was saved on. */ #define RETRO_SERIALIZATION_QUIRK_ENDIAN_DEPENDENT (1 << 5) /* Serialized state cannot be loaded on a different platform from the one it * was saved on for reasons other than endianness, such as word size * dependence */ #define RETRO_SERIALIZATION_QUIRK_PLATFORM_DEPENDENT (1 << 6) #define RETRO_ENVIRONMENT_SET_SERIALIZATION_QUIRKS 44 /* uint64_t * -- * Sets quirk flags associated with serialization. The frontend will zero any flags it doesn't * recognize or support. Should be set in either retro_init or retro_load_game, but not both. */ #define RETRO_MEMDESC_CONST (1 << 0) /* The frontend will never change this memory area once retro_load_game has returned. */ #define RETRO_MEMDESC_BIGENDIAN (1 << 1) /* The memory area contains big endian data. Default is little endian. */ #define RETRO_MEMDESC_ALIGN_2 (1 << 16) /* All memory access in this area is aligned to their own size, or 2, whichever is smaller. */ #define RETRO_MEMDESC_ALIGN_4 (2 << 16) #define RETRO_MEMDESC_ALIGN_8 (3 << 16) #define RETRO_MEMDESC_MINSIZE_2 (1 << 24) /* All memory in this region is accessed at least 2 bytes at the time. */ #define RETRO_MEMDESC_MINSIZE_4 (2 << 24) #define RETRO_MEMDESC_MINSIZE_8 (3 << 24) struct retro_memory_descriptor { uint64_t flags; /* Pointer to the start of the relevant ROM or RAM chip. * It's strongly recommended to use 'offset' if possible, rather than * doing math on the pointer. * * If the same byte is mapped my multiple descriptors, their descriptors * must have the same pointer. * If 'start' does not point to the first byte in the pointer, put the * difference in 'offset' instead. * * May be NULL if there's nothing usable here (e.g. hardware registers and * open bus). No flags should be set if the pointer is NULL. * It's recommended to minimize the number of descriptors if possible, * but not mandatory. */ void *ptr; size_t offset; /* This is the location in the emulated address space * where the mapping starts. */ size_t start; /* Which bits must be same as in 'start' for this mapping to apply. * The first memory descriptor to claim a certain byte is the one * that applies. * A bit which is set in 'start' must also be set in this. * Can be zero, in which case each byte is assumed mapped exactly once. * In this case, 'len' must be a power of two. */ size_t select; /* If this is nonzero, the set bits are assumed not connected to the * memory chip's address pins. */ size_t disconnect; /* This one tells the size of the current memory area. * If, after start+disconnect are applied, the address is higher than * this, the highest bit of the address is cleared. * * If the address is still too high, the next highest bit is cleared. * Can be zero, in which case it's assumed to be infinite (as limited * by 'select' and 'disconnect'). */ size_t len; /* To go from emulated address to physical address, the following * order applies: * Subtract 'start', pick off 'disconnect', apply 'len', add 'offset'. */ /* The address space name must consist of only a-zA-Z0-9_-, * should be as short as feasible (maximum length is 8 plus the NUL), * and may not be any other address space plus one or more 0-9A-F * at the end. * However, multiple memory descriptors for the same address space is * allowed, and the address space name can be empty. NULL is treated * as empty. * * Address space names are case sensitive, but avoid lowercase if possible. * The same pointer may exist in multiple address spaces. * * Examples: * blank+blank - valid (multiple things may be mapped in the same namespace) * 'Sp'+'Sp' - valid (multiple things may be mapped in the same namespace) * 'A'+'B' - valid (neither is a prefix of each other) * 'S'+blank - valid ('S' is not in 0-9A-F) * 'a'+blank - valid ('a' is not in 0-9A-F) * 'a'+'A' - valid (neither is a prefix of each other) * 'AR'+blank - valid ('R' is not in 0-9A-F) * 'ARB'+blank - valid (the B can't be part of the address either, because * there is no namespace 'AR') * blank+'B' - not valid, because it's ambigous which address space B1234 * would refer to. * The length can't be used for that purpose; the frontend may want * to append arbitrary data to an address, without a separator. */ const char *addrspace; /* TODO: When finalizing this one, add a description field, which should be * "WRAM" or something roughly equally long. */ /* TODO: When finalizing this one, replace 'select' with 'limit', which tells * which bits can vary and still refer to the same address (limit = ~select). * TODO: limit? range? vary? something else? */ /* TODO: When finalizing this one, if 'len' is above what 'select' (or * 'limit') allows, it's bankswitched. Bankswitched data must have both 'len' * and 'select' != 0, and the mappings don't tell how the system switches the * banks. */ /* TODO: When finalizing this one, fix the 'len' bit removal order. * For len=0x1800, pointer 0x1C00 should go to 0x1400, not 0x0C00. * Algorithm: Take bits highest to lowest, but if it goes above len, clear * the most recent addition and continue on the next bit. * TODO: Can the above be optimized? Is "remove the lowest bit set in both * pointer and 'len'" equivalent? */ /* TODO: Some emulators (MAME?) emulate big endian systems by only accessing * the emulated memory in 32-bit chunks, native endian. But that's nothing * compared to Darek Mihocka <http://www.emulators.com/docs/nx07_vm101.htm> * (section Emulation 103 - Nearly Free Byte Reversal) - he flips the ENTIRE * RAM backwards! I'll want to represent both of those, via some flags. * * I suspect MAME either didn't think of that idea, or don't want the #ifdef. * Not sure which, nor do I really care. */ /* TODO: Some of those flags are unused and/or don't really make sense. Clean * them up. */ }; /* The frontend may use the largest value of 'start'+'select' in a * certain namespace to infer the size of the address space. * * If the address space is larger than that, a mapping with .ptr=NULL * should be at the end of the array, with .select set to all ones for * as long as the address space is big. * * Sample descriptors (minus .ptr, and RETRO_MEMFLAG_ on the flags): * SNES WRAM: * .start=0x7E0000, .len=0x20000 * (Note that this must be mapped before the ROM in most cases; some of the * ROM mappers * try to claim $7E0000, or at least $7E8000.) * SNES SPC700 RAM: * .addrspace="S", .len=0x10000 * SNES WRAM mirrors: * .flags=MIRROR, .start=0x000000, .select=0xC0E000, .len=0x2000 * .flags=MIRROR, .start=0x800000, .select=0xC0E000, .len=0x2000 * SNES WRAM mirrors, alternate equivalent descriptor: * .flags=MIRROR, .select=0x40E000, .disconnect=~0x1FFF * (Various similar constructions can be created by combining parts of * the above two.) * SNES LoROM (512KB, mirrored a couple of times): * .flags=CONST, .start=0x008000, .select=0x408000, .disconnect=0x8000, .len=512*1024 * .flags=CONST, .start=0x400000, .select=0x400000, .disconnect=0x8000, .len=512*1024 * SNES HiROM (4MB): * .flags=CONST, .start=0x400000, .select=0x400000, .len=4*1024*1024 * .flags=CONST, .offset=0x8000, .start=0x008000, .select=0x408000, .len=4*1024*1024 * SNES ExHiROM (8MB): * .flags=CONST, .offset=0, .start=0xC00000, .select=0xC00000, .len=4*1024*1024 * .flags=CONST, .offset=4*1024*1024, .start=0x400000, .select=0xC00000, .len=4*1024*1024 * .flags=CONST, .offset=0x8000, .start=0x808000, .select=0xC08000, .len=4*1024*1024 * .flags=CONST, .offset=4*1024*1024+0x8000, .start=0x008000, .select=0xC08000, .len=4*1024*1024 * Clarify the size of the address space: * .ptr=NULL, .select=0xFFFFFF * .len can be implied by .select in many of them, but was included for clarity. */ struct retro_memory_map { const struct retro_memory_descriptor *descriptors; unsigned num_descriptors; }; struct retro_controller_description { /* Human-readable description of the controller. Even if using a generic * input device type, this can be set to the particular device type the * core uses. */ const char *desc; /* Device type passed to retro_set_controller_port_device(). If the device * type is a sub-class of a generic input device type, use the * RETRO_DEVICE_SUBCLASS macro to create an ID. * * E.g. RETRO_DEVICE_SUBCLASS(RETRO_DEVICE_JOYPAD, 1). */ unsigned id; }; struct retro_controller_info { const struct retro_controller_description *types; unsigned num_types; }; struct retro_subsystem_memory_info { /* The extension associated with a memory type, e.g. "psram". */ const char *extension; /* The memory type for retro_get_memory(). This should be at * least 0x100 to avoid conflict with standardized * libretro memory types. */ unsigned type; }; struct retro_subsystem_rom_info { /* Describes what the content is (SGB BIOS, GB ROM, etc). */ const char *desc; /* Same definition as retro_get_system_info(). */ const char *valid_extensions; /* Same definition as retro_get_system_info(). */ bool need_fullpath; /* Same definition as retro_get_system_info(). */ bool block_extract; /* This is set if the content is required to load a game. * If this is set to false, a zeroed-out retro_game_info can be passed. */ bool required; /* Content can have multiple associated persistent * memory types (retro_get_memory()). */ const struct retro_subsystem_memory_info *memory; unsigned num_memory; }; struct retro_subsystem_info { /* Human-readable string of the subsystem type, e.g. "Super GameBoy" */ const char *desc; /* A computer friendly short string identifier for the subsystem type. * This name must be [a-z]. * E.g. if desc is "Super GameBoy", this can be "sgb". * This identifier can be used for command-line interfaces, etc. */ const char *ident; /* Infos for each content file. The first entry is assumed to be the * "most significant" content for frontend purposes. * E.g. with Super GameBoy, the first content should be the GameBoy ROM, * as it is the most "significant" content to a user. * If a frontend creates new file paths based on the content used * (e.g. savestates), it should use the path for the first ROM to do so. */ const struct retro_subsystem_rom_info *roms; /* Number of content files associated with a subsystem. */ unsigned num_roms; /* The type passed to retro_load_game_special(). */ unsigned id; }; typedef void (RETRO_CALLCONV *retro_proc_address_t)(void); /* libretro API extension functions: * (None here so far). * * Get a symbol from a libretro core. * Cores should only return symbols which are actual * extensions to the libretro API. * * Frontends should not use this to obtain symbols to standard * libretro entry points (static linking or dlsym). * * The symbol name must be equal to the function name, * e.g. if void retro_foo(void); exists, the symbol must be called "retro_foo". * The returned function pointer must be cast to the corresponding type. */ typedef retro_proc_address_t (RETRO_CALLCONV *retro_get_proc_address_t)(const char *sym); struct retro_get_proc_address_interface { retro_get_proc_address_t get_proc_address; }; enum retro_log_level { RETRO_LOG_DEBUG = 0, RETRO_LOG_INFO, RETRO_LOG_WARN, RETRO_LOG_ERROR, RETRO_LOG_DUMMY = INT_MAX }; /* Logging function. Takes log level argument as well. */ typedef void (RETRO_CALLCONV *retro_log_printf_t)(enum retro_log_level level, const char *fmt, ...); struct retro_log_callback { retro_log_printf_t log; }; /* Performance related functions */ /* ID values for SIMD CPU features */ #define RETRO_SIMD_SSE (1 << 0) #define RETRO_SIMD_SSE2 (1 << 1) #define RETRO_SIMD_VMX (1 << 2) #define RETRO_SIMD_VMX128 (1 << 3) #define RETRO_SIMD_AVX (1 << 4) #define RETRO_SIMD_NEON (1 << 5) #define RETRO_SIMD_SSE3 (1 << 6) #define RETRO_SIMD_SSSE3 (1 << 7) #define RETRO_SIMD_MMX (1 << 8) #define RETRO_SIMD_MMXEXT (1 << 9) #define RETRO_SIMD_SSE4 (1 << 10) #define RETRO_SIMD_SSE42 (1 << 11) #define RETRO_SIMD_AVX2 (1 << 12) #define RETRO_SIMD_VFPU (1 << 13) #define RETRO_SIMD_PS (1 << 14) #define RETRO_SIMD_AES (1 << 15) #define RETRO_SIMD_VFPV3 (1 << 16) #define RETRO_SIMD_VFPV4 (1 << 17) #define RETRO_SIMD_POPCNT (1 << 18) #define RETRO_SIMD_MOVBE (1 << 19) #define RETRO_SIMD_CMOV (1 << 20) #define RETRO_SIMD_ASIMD (1 << 21) typedef uint64_t retro_perf_tick_t; typedef int64_t retro_time_t; struct retro_perf_counter { const char *ident; retro_perf_tick_t start; retro_perf_tick_t total; retro_perf_tick_t call_cnt; bool registered; }; /* Returns current time in microseconds. * Tries to use the most accurate timer available. */ typedef retro_time_t (RETRO_CALLCONV *retro_perf_get_time_usec_t)(void); /* A simple counter. Usually nanoseconds, but can also be CPU cycles. * Can be used directly if desired (when creating a more sophisticated * performance counter system). * */ typedef retro_perf_tick_t (RETRO_CALLCONV *retro_perf_get_counter_t)(void); /* Returns a bit-mask of detected CPU features (RETRO_SIMD_*). */ typedef uint64_t (RETRO_CALLCONV *retro_get_cpu_features_t)(void); /* Asks frontend to log and/or display the state of performance counters. * Performance counters can always be poked into manually as well. */ typedef void (RETRO_CALLCONV *retro_perf_log_t)(void); /* Register a performance counter. * ident field must be set with a discrete value and other values in * retro_perf_counter must be 0. * Registering can be called multiple times. To avoid calling to * frontend redundantly, you can check registered field first. */ typedef void (RETRO_CALLCONV *retro_perf_register_t)(struct retro_perf_counter *counter); /* Starts a registered counter. */ typedef void (RETRO_CALLCONV *retro_perf_start_t)(struct retro_perf_counter *counter); /* Stops a registered counter. */ typedef void (RETRO_CALLCONV *retro_perf_stop_t)(struct retro_perf_counter *counter); /* For convenience it can be useful to wrap register, start and stop in macros. * E.g.: * #ifdef LOG_PERFORMANCE * #define RETRO_PERFORMANCE_INIT(perf_cb, name) static struct retro_perf_counter name = {#name}; if (!name.registered) perf_cb.perf_register(&(name)) * #define RETRO_PERFORMANCE_START(perf_cb, name) perf_cb.perf_start(&(name)) * #define RETRO_PERFORMANCE_STOP(perf_cb, name) perf_cb.perf_stop(&(name)) * #else * ... Blank macros ... * #endif * * These can then be used mid-functions around code snippets. * * extern struct retro_perf_callback perf_cb; * Somewhere in the core. * * void do_some_heavy_work(void) * { * RETRO_PERFORMANCE_INIT(cb, work_1; * RETRO_PERFORMANCE_START(cb, work_1); * heavy_work_1(); * RETRO_PERFORMANCE_STOP(cb, work_1); * * RETRO_PERFORMANCE_INIT(cb, work_2); * RETRO_PERFORMANCE_START(cb, work_2); * heavy_work_2(); * RETRO_PERFORMANCE_STOP(cb, work_2); * } * * void retro_deinit(void) * { * perf_cb.perf_log(); * Log all perf counters here for example. * } */ struct retro_perf_callback { retro_perf_get_time_usec_t get_time_usec; retro_get_cpu_features_t get_cpu_features; retro_perf_get_counter_t get_perf_counter; retro_perf_register_t perf_register; retro_perf_start_t perf_start; retro_perf_stop_t perf_stop; retro_perf_log_t perf_log; }; /* FIXME: Document the sensor API and work out behavior. * It will be marked as experimental until then. */ enum retro_sensor_action { RETRO_SENSOR_ACCELEROMETER_ENABLE = 0, RETRO_SENSOR_ACCELEROMETER_DISABLE, RETRO_SENSOR_DUMMY = INT_MAX }; /* Id values for SENSOR types. */ #define RETRO_SENSOR_ACCELEROMETER_X 0 #define RETRO_SENSOR_ACCELEROMETER_Y 1 #define RETRO_SENSOR_ACCELEROMETER_Z 2 typedef bool (RETRO_CALLCONV *retro_set_sensor_state_t)(unsigned port, enum retro_sensor_action action, unsigned rate); typedef float (RETRO_CALLCONV *retro_sensor_get_input_t)(unsigned port, unsigned id); struct retro_sensor_interface { retro_set_sensor_state_t set_sensor_state; retro_sensor_get_input_t get_sensor_input; }; enum retro_camera_buffer { RETRO_CAMERA_BUFFER_OPENGL_TEXTURE = 0, RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER, RETRO_CAMERA_BUFFER_DUMMY = INT_MAX }; /* Starts the camera driver. Can only be called in retro_run(). */ typedef bool (RETRO_CALLCONV *retro_camera_start_t)(void); /* Stops the camera driver. Can only be called in retro_run(). */ typedef void (RETRO_CALLCONV *retro_camera_stop_t)(void); /* Callback which signals when the camera driver is initialized * and/or deinitialized. * retro_camera_start_t can be called in initialized callback. */ typedef void (RETRO_CALLCONV *retro_camera_lifetime_status_t)(void); /* A callback for raw framebuffer data. buffer points to an XRGB8888 buffer. * Width, height and pitch are similar to retro_video_refresh_t. * First pixel is top-left origin. */ typedef void (RETRO_CALLCONV *retro_camera_frame_raw_framebuffer_t)(const uint32_t *buffer, unsigned width, unsigned height, size_t pitch); /* A callback for when OpenGL textures are used. * * texture_id is a texture owned by camera driver. * Its state or content should be considered immutable, except for things like * texture filtering and clamping. * * texture_target is the texture target for the GL texture. * These can include e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE, and possibly * more depending on extensions. * * affine points to a packed 3x3 column-major matrix used to apply an affine * transform to texture coordinates. (affine_matrix * vec3(coord_x, coord_y, 1.0)) * After transform, normalized texture coord (0, 0) should be bottom-left * and (1, 1) should be top-right (or (width, height) for RECTANGLE). * * GL-specific typedefs are avoided here to avoid relying on gl.h in * the API definition. */ typedef void (RETRO_CALLCONV *retro_camera_frame_opengl_texture_t)(unsigned texture_id, unsigned texture_target, const float *affine); struct retro_camera_callback { /* Set by libretro core. * Example bitmask: caps = (1 << RETRO_CAMERA_BUFFER_OPENGL_TEXTURE) | (1 << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER). */ uint64_t caps; /* Desired resolution for camera. Is only used as a hint. */ unsigned width; unsigned height; /* Set by frontend. */ retro_camera_start_t start; retro_camera_stop_t stop; /* Set by libretro core if raw framebuffer callbacks will be used. */ retro_camera_frame_raw_framebuffer_t frame_raw_framebuffer; /* Set by libretro core if OpenGL texture callbacks will be used. */ retro_camera_frame_opengl_texture_t frame_opengl_texture; /* Set by libretro core. Called after camera driver is initialized and * ready to be started. * Can be NULL, in which this callback is not called. */ retro_camera_lifetime_status_t initialized; /* Set by libretro core. Called right before camera driver is * deinitialized. * Can be NULL, in which this callback is not called. */ retro_camera_lifetime_status_t deinitialized; }; /* Sets the interval of time and/or distance at which to update/poll * location-based data. * * To ensure compatibility with all location-based implementations, * values for both interval_ms and interval_distance should be provided. * * interval_ms is the interval expressed in milliseconds. * interval_distance is the distance interval expressed in meters. */ typedef void (RETRO_CALLCONV *retro_location_set_interval_t)(unsigned interval_ms, unsigned interval_distance); /* Start location services. The device will start listening for changes to the * current location at regular intervals (which are defined with * retro_location_set_interval_t). */ typedef bool (RETRO_CALLCONV *retro_location_start_t)(void); /* Stop location services. The device will stop listening for changes * to the current location. */ typedef void (RETRO_CALLCONV *retro_location_stop_t)(void); /* Get the position of the current location. Will set parameters to * 0 if no new location update has happened since the last time. */ typedef bool (RETRO_CALLCONV *retro_location_get_position_t)(double *lat, double *lon, double *horiz_accuracy, double *vert_accuracy); /* Callback which signals when the location driver is initialized * and/or deinitialized. * retro_location_start_t can be called in initialized callback. */ typedef void (RETRO_CALLCONV *retro_location_lifetime_status_t)(void); struct retro_location_callback { retro_location_start_t start; retro_location_stop_t stop; retro_location_get_position_t get_position; retro_location_set_interval_t set_interval; retro_location_lifetime_status_t initialized; retro_location_lifetime_status_t deinitialized; }; enum retro_rumble_effect { RETRO_RUMBLE_STRONG = 0, RETRO_RUMBLE_WEAK = 1, RETRO_RUMBLE_DUMMY = INT_MAX }; /* Sets rumble state for joypad plugged in port 'port'. * Rumble effects are controlled independently, * and setting e.g. strong rumble does not override weak rumble. * Strength has a range of [0, 0xffff]. * * Returns true if rumble state request was honored. * Calling this before first retro_run() is likely to return false. */ typedef bool (RETRO_CALLCONV *retro_set_rumble_state_t)(unsigned port, enum retro_rumble_effect effect, uint16_t strength); struct retro_rumble_interface { retro_set_rumble_state_t set_rumble_state; }; /* Notifies libretro that audio data should be written. */ typedef void (RETRO_CALLCONV *retro_audio_callback_t)(void); /* True: Audio driver in frontend is active, and callback is * expected to be called regularily. * False: Audio driver in frontend is paused or inactive. * Audio callback will not be called until set_state has been * called with true. * Initial state is false (inactive). */ typedef void (RETRO_CALLCONV *retro_audio_set_state_callback_t)(bool enabled); struct retro_audio_callback { retro_audio_callback_t callback; retro_audio_set_state_callback_t set_state; }; /* Notifies a libretro core of time spent since last invocation * of retro_run() in microseconds. * * It will be called right before retro_run() every frame. * The frontend can tamper with timing to support cases like * fast-forward, slow-motion and framestepping. * * In those scenarios the reference frame time value will be used. */ typedef int64_t retro_usec_t; typedef void (RETRO_CALLCONV *retro_frame_time_callback_t)(retro_usec_t usec); struct retro_frame_time_callback { retro_frame_time_callback_t callback; /* Represents the time of one frame. It is computed as * 1000000 / fps, but the implementation will resolve the * rounding to ensure that framestepping, etc is exact. */ retro_usec_t reference; }; /* Pass this to retro_video_refresh_t if rendering to hardware. * Passing NULL to retro_video_refresh_t is still a frame dupe as normal. * */ #define RETRO_HW_FRAME_BUFFER_VALID ((void*)-1) /* Invalidates the current HW context. * Any GL state is lost, and must not be deinitialized explicitly. * If explicit deinitialization is desired by the libretro core, * it should implement context_destroy callback. * If called, all GPU resources must be reinitialized. * Usually called when frontend reinits video driver. * Also called first time video driver is initialized, * allowing libretro core to initialize resources. */ typedef void (RETRO_CALLCONV *retro_hw_context_reset_t)(void); /* Gets current framebuffer which is to be rendered to. * Could change every frame potentially. */ typedef uintptr_t (RETRO_CALLCONV *retro_hw_get_current_framebuffer_t)(void); /* Get a symbol from HW context. */ typedef retro_proc_address_t (RETRO_CALLCONV *retro_hw_get_proc_address_t)(const char *sym); enum retro_hw_context_type { RETRO_HW_CONTEXT_NONE = 0, /* OpenGL 2.x. Driver can choose to use latest compatibility context. */ RETRO_HW_CONTEXT_OPENGL = 1, /* OpenGL ES 2.0. */ RETRO_HW_CONTEXT_OPENGLES2 = 2, /* Modern desktop core GL context. Use version_major/ * version_minor fields to set GL version. */ RETRO_HW_CONTEXT_OPENGL_CORE = 3, /* OpenGL ES 3.0 */ RETRO_HW_CONTEXT_OPENGLES3 = 4, /* OpenGL ES 3.1+. Set version_major/version_minor. For GLES2 and GLES3, * use the corresponding enums directly. */ RETRO_HW_CONTEXT_OPENGLES_VERSION = 5, /* Vulkan, see RETRO_ENVIRONMENT_GET_HW_RENDER_INTERFACE. */ RETRO_HW_CONTEXT_VULKAN = 6, RETRO_HW_CONTEXT_DUMMY = INT_MAX }; struct retro_hw_render_callback { /* Which API to use. Set by libretro core. */ enum retro_hw_context_type context_type; /* Called when a context has been created or when it has been reset. * An OpenGL context is only valid after context_reset() has been called. * * When context_reset is called, OpenGL resources in the libretro * implementation are guaranteed to be invalid. * * It is possible that context_reset is called multiple times during an * application lifecycle. * If context_reset is called without any notification (context_destroy), * the OpenGL context was lost and resources should just be recreated * without any attempt to "free" old resources. */ retro_hw_context_reset_t context_reset; /* Set by frontend. * TODO: This is rather obsolete. The frontend should not * be providing preallocated framebuffers. */ retro_hw_get_current_framebuffer_t get_current_framebuffer; /* Set by frontend. * Can return all relevant functions, including glClear on Windows. */ retro_hw_get_proc_address_t get_proc_address; /* Set if render buffers should have depth component attached. * TODO: Obsolete. */ bool depth; /* Set if stencil buffers should be attached. * TODO: Obsolete. */ bool stencil; /* If depth and stencil are true, a packed 24/8 buffer will be added. * Only attaching stencil is invalid and will be ignored. */ /* Use conventional bottom-left origin convention. If false, * standard libretro top-left origin semantics are used. * TODO: Move to GL specific interface. */ bool bottom_left_origin; /* Major version number for core GL context or GLES 3.1+. */ unsigned version_major; /* Minor version number for core GL context or GLES 3.1+. */ unsigned version_minor; /* If this is true, the frontend will go very far to avoid * resetting context in scenarios like toggling fullscreen, etc. * TODO: Obsolete? Maybe frontend should just always assume this ... */ bool cache_context; /* The reset callback might still be called in extreme situations * such as if the context is lost beyond recovery. * * For optimal stability, set this to false, and allow context to be * reset at any time. */ /* A callback to be called before the context is destroyed in a * controlled way by the frontend. */ retro_hw_context_reset_t context_destroy; /* OpenGL resources can be deinitialized cleanly at this step. * context_destroy can be set to NULL, in which resources will * just be destroyed without any notification. * * Even when context_destroy is non-NULL, it is possible that * context_reset is called without any destroy notification. * This happens if context is lost by external factors (such as * notified by GL_ARB_robustness). * * In this case, the context is assumed to be already dead, * and the libretro implementation must not try to free any OpenGL * resources in the subsequent context_reset. */ /* Creates a debug context. */ bool debug_context; }; /* Callback type passed in RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK. * Called by the frontend in response to keyboard events. * down is set if the key is being pressed, or false if it is being released. * keycode is the RETROK value of the char. * character is the text character of the pressed key. (UTF-32). * key_modifiers is a set of RETROKMOD values or'ed together. * * The pressed/keycode state can be indepedent of the character. * It is also possible that multiple characters are generated from a * single keypress. * Keycode events should be treated separately from character events. * However, when possible, the frontend should try to synchronize these. * If only a character is posted, keycode should be RETROK_UNKNOWN. * * Similarily if only a keycode event is generated with no corresponding * character, character should be 0. */ typedef void (RETRO_CALLCONV *retro_keyboard_event_t)(bool down, unsigned keycode, uint32_t character, uint16_t key_modifiers); struct retro_keyboard_callback { retro_keyboard_event_t callback; }; /* Callbacks for RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE. * Should be set for implementations which can swap out multiple disk * images in runtime. * * If the implementation can do this automatically, it should strive to do so. * However, there are cases where the user must manually do so. * * Overview: To swap a disk image, eject the disk image with * set_eject_state(true). * Set the disk index with set_image_index(index). Insert the disk again * with set_eject_state(false). */ /* If ejected is true, "ejects" the virtual disk tray. * When ejected, the disk image index can be set. */ typedef bool (RETRO_CALLCONV *retro_set_eject_state_t)(bool ejected); /* Gets current eject state. The initial state is 'not ejected'. */ typedef bool (RETRO_CALLCONV *retro_get_eject_state_t)(void); /* Gets current disk index. First disk is index 0. * If return value is >= get_num_images(), no disk is currently inserted. */ typedef unsigned (RETRO_CALLCONV *retro_get_image_index_t)(void); /* Sets image index. Can only be called when disk is ejected. * The implementation supports setting "no disk" by using an * index >= get_num_images(). */ typedef bool (RETRO_CALLCONV *retro_set_image_index_t)(unsigned index); /* Gets total number of images which are available to use. */ typedef unsigned (RETRO_CALLCONV *retro_get_num_images_t)(void); struct retro_game_info; /* Replaces the disk image associated with index. * Arguments to pass in info have same requirements as retro_load_game(). * Virtual disk tray must be ejected when calling this. * * Replacing a disk image with info = NULL will remove the disk image * from the internal list. * As a result, calls to get_image_index() can change. * * E.g. replace_image_index(1, NULL), and previous get_image_index() * returned 4 before. * Index 1 will be removed, and the new index is 3. */ typedef bool (RETRO_CALLCONV *retro_replace_image_index_t)(unsigned index, const struct retro_game_info *info); /* Adds a new valid index (get_num_images()) to the internal disk list. * This will increment subsequent return values from get_num_images() by 1. * This image index cannot be used until a disk image has been set * with replace_image_index. */ typedef bool (RETRO_CALLCONV *retro_add_image_index_t)(void); struct retro_disk_control_callback { retro_set_eject_state_t set_eject_state; retro_get_eject_state_t get_eject_state; retro_get_image_index_t get_image_index; retro_set_image_index_t set_image_index; retro_get_num_images_t get_num_images; retro_replace_image_index_t replace_image_index; retro_add_image_index_t add_image_index; }; enum retro_pixel_format { /* 0RGB1555, native endian. * 0 bit must be set to 0. * This pixel format is default for compatibility concerns only. * If a 15/16-bit pixel format is desired, consider using RGB565. */ RETRO_PIXEL_FORMAT_0RGB1555 = 0, /* XRGB8888, native endian. * X bits are ignored. */ RETRO_PIXEL_FORMAT_XRGB8888 = 1, /* RGB565, native endian. * This pixel format is the recommended format to use if a 15/16-bit * format is desired as it is the pixel format that is typically * available on a wide range of low-power devices. * * It is also natively supported in APIs like OpenGL ES. */ RETRO_PIXEL_FORMAT_RGB565 = 2, /* Ensure sizeof() == sizeof(int). */ RETRO_PIXEL_FORMAT_UNKNOWN = INT_MAX }; struct retro_message { const char *msg; /* Message to be displayed. */ unsigned frames; /* Duration in frames of message. */ }; /* Describes how the libretro implementation maps a libretro input bind * to its internal input system through a human readable string. * This string can be used to better let a user configure input. */ struct retro_input_descriptor { /* Associates given parameters with a description. */ unsigned port; unsigned device; unsigned index; unsigned id; /* Human readable description for parameters. * The pointer must remain valid until * retro_unload_game() is called. */ const char *description; }; struct retro_system_info { /* All pointers are owned by libretro implementation, and pointers must * remain valid until retro_deinit() is called. */ const char *library_name; /* Descriptive name of library. Should not * contain any version numbers, etc. */ const char *library_version; /* Descriptive version of core. */ const char *valid_extensions; /* A string listing probably content * extensions the core will be able to * load, separated with pipe. * I.e. "bin|rom|iso". * Typically used for a GUI to filter * out extensions. */ /* If true, retro_load_game() is guaranteed to provide a valid pathname * in retro_game_info::path. * ::data and ::size are both invalid. * * If false, ::data and ::size are guaranteed to be valid, but ::path * might not be valid. * * This is typically set to true for libretro implementations that must * load from file. * Implementations should strive for setting this to false, as it allows * the frontend to perform patching, etc. */ bool need_fullpath; /* If true, the frontend is not allowed to extract any archives before * loading the real content. * Necessary for certain libretro implementations that load games * from zipped archives. */ bool block_extract; }; struct retro_game_geometry { unsigned base_width; /* Nominal video width of game. */ unsigned base_height; /* Nominal video height of game. */ unsigned max_width; /* Maximum possible width of game. */ unsigned max_height; /* Maximum possible height of game. */ float aspect_ratio; /* Nominal aspect ratio of game. If * aspect_ratio is <= 0.0, an aspect ratio * of base_width / base_height is assumed. * A frontend could override this setting, * if desired. */ }; struct retro_system_timing { double fps; /* FPS of video content. */ double sample_rate; /* Sampling rate of audio. */ }; struct retro_system_av_info { struct retro_game_geometry geometry; struct retro_system_timing timing; }; struct retro_variable { /* Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE. * If NULL, obtains the complete environment string if more * complex parsing is necessary. * The environment string is formatted as key-value pairs * delimited by semicolons as so: * "key1=value1;key2=value2;..." */ const char *key; /* Value to be obtained. If key does not exist, it is set to NULL. */ const char *value; }; struct retro_game_info { const char *path; /* Path to game, UTF-8 encoded. * Sometimes used as a reference for building other paths. * May be NULL if game was loaded from stdin or similar, * but in this case some cores will be unable to load `data`. * So, it is preferable to fabricate something here instead * of passing NULL, which will help more cores to succeed. * retro_system_info::need_fullpath requires * that this path is valid. */ const void *data; /* Memory buffer of loaded game. Will be NULL * if need_fullpath was set. */ size_t size; /* Size of memory buffer. */ const char *meta; /* String of implementation specific meta-data. */ }; #define RETRO_MEMORY_ACCESS_WRITE (1 << 0) /* The core will write to the buffer provided by retro_framebuffer::data. */ #define RETRO_MEMORY_ACCESS_READ (1 << 1) /* The core will read from retro_framebuffer::data. */ #define RETRO_MEMORY_TYPE_CACHED (1 << 0) /* The memory in data is cached. * If not cached, random writes and/or reading from the buffer is expected to be very slow. */ struct retro_framebuffer { void *data; /* The framebuffer which the core can render into. Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. The initial contents of data are unspecified. */ unsigned width; /* The framebuffer width used by the core. Set by core. */ unsigned height; /* The framebuffer height used by the core. Set by core. */ size_t pitch; /* The number of bytes between the beginning of a scanline, and beginning of the next scanline. Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */ enum retro_pixel_format format; /* The pixel format the core must use to render into data. This format could differ from the format used in SET_PIXEL_FORMAT. Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */ unsigned access_flags; /* How the core will access the memory in the framebuffer. RETRO_MEMORY_ACCESS_* flags. Set by core. */ unsigned memory_flags; /* Flags telling core how the memory has been mapped. RETRO_MEMORY_TYPE_* flags. Set by frontend in GET_CURRENT_SOFTWARE_FRAMEBUFFER. */ }; /* Callbacks */ /* Environment callback. Gives implementations a way of performing * uncommon tasks. Extensible. */ typedef bool (RETRO_CALLCONV *retro_environment_t)(unsigned cmd, void *data); /* Render a frame. Pixel format is 15-bit 0RGB1555 native endian * unless changed (see RETRO_ENVIRONMENT_SET_PIXEL_FORMAT). * * Width and height specify dimensions of buffer. * Pitch specifices length in bytes between two lines in buffer. * * For performance reasons, it is highly recommended to have a frame * that is packed in memory, i.e. pitch == width * byte_per_pixel. * Certain graphic APIs, such as OpenGL ES, do not like textures * that are not packed in memory. */ typedef void (RETRO_CALLCONV *retro_video_refresh_t)(const void *data, unsigned width, unsigned height, size_t pitch); /* Renders a single audio frame. Should only be used if implementation * generates a single sample at a time. * Format is signed 16-bit native endian. */ typedef void (RETRO_CALLCONV *retro_audio_sample_t)(int16_t left, int16_t right); /* Renders multiple audio frames in one go. * * One frame is defined as a sample of left and right channels, interleaved. * I.e. int16_t buf[4] = { l, r, l, r }; would be 2 frames. * Only one of the audio callbacks must ever be used. */ typedef size_t (RETRO_CALLCONV *retro_audio_sample_batch_t)(const int16_t *data, size_t frames); /* Polls input. */ typedef void (RETRO_CALLCONV *retro_input_poll_t)(void); /* Queries for input for player 'port'. device will be masked with * RETRO_DEVICE_MASK. * * Specialization of devices such as RETRO_DEVICE_JOYPAD_MULTITAP that * have been set with retro_set_controller_port_device() * will still use the higher level RETRO_DEVICE_JOYPAD to request input. */ typedef int16_t (RETRO_CALLCONV *retro_input_state_t)(unsigned port, unsigned device, unsigned index, unsigned id); /* Sets callbacks. retro_set_environment() is guaranteed to be called * before retro_init(). * * The rest of the set_* functions are guaranteed to have been called * before the first call to retro_run() is made. */ RETRO_API void retro_set_environment(retro_environment_t); RETRO_API void retro_set_video_refresh(retro_video_refresh_t); RETRO_API void retro_set_audio_sample(retro_audio_sample_t); RETRO_API void retro_set_audio_sample_batch(retro_audio_sample_batch_t); RETRO_API void retro_set_input_poll(retro_input_poll_t); RETRO_API void retro_set_input_state(retro_input_state_t); /* Library global initialization/deinitialization. */ RETRO_API void retro_init(void); RETRO_API void retro_deinit(void); /* Must return RETRO_API_VERSION. Used to validate ABI compatibility * when the API is revised. */ RETRO_API unsigned retro_api_version(void); /* Gets statically known system info. Pointers provided in *info * must be statically allocated. * Can be called at any time, even before retro_init(). */ RETRO_API void retro_get_system_info(struct retro_system_info *info); /* Gets information about system audio/video timings and geometry. * Can be called only after retro_load_game() has successfully completed. * NOTE: The implementation of this function might not initialize every * variable if needed. * E.g. geom.aspect_ratio might not be initialized if core doesn't * desire a particular aspect ratio. */ RETRO_API void retro_get_system_av_info(struct retro_system_av_info *info); /* Sets device to be used for player 'port'. * By default, RETRO_DEVICE_JOYPAD is assumed to be plugged into all * available ports. * Setting a particular device type is not a guarantee that libretro cores * will only poll input based on that particular device type. It is only a * hint to the libretro core when a core cannot automatically detect the * appropriate input device type on its own. It is also relevant when a * core can change its behavior depending on device type. */ RETRO_API void retro_set_controller_port_device(unsigned port, unsigned device); /* Resets the current game. */ RETRO_API void retro_reset(void); /* Runs the game for one video frame. * During retro_run(), input_poll callback must be called at least once. * * If a frame is not rendered for reasons where a game "dropped" a frame, * this still counts as a frame, and retro_run() should explicitly dupe * a frame if GET_CAN_DUPE returns true. * In this case, the video callback can take a NULL argument for data. */ RETRO_API void retro_run(void); /* Returns the amount of data the implementation requires to serialize * internal state (save states). * Between calls to retro_load_game() and retro_unload_game(), the * returned size is never allowed to be larger than a previous returned * value, to ensure that the frontend can allocate a save state buffer once. */ RETRO_API size_t retro_serialize_size(void); /* Serializes internal state. If failed, or size is lower than * retro_serialize_size(), it should return false, true otherwise. */ RETRO_API bool retro_serialize(void *data, size_t size); RETRO_API bool retro_unserialize(const void *data, size_t size); RETRO_API void retro_cheat_reset(void); RETRO_API void retro_cheat_set(unsigned index, bool enabled, const char *code); /* Loads a game. */ RETRO_API bool retro_load_game(const struct retro_game_info *game); /* Loads a "special" kind of game. Should not be used, * except in extreme cases. */ RETRO_API bool retro_load_game_special( unsigned game_type, const struct retro_game_info *info, size_t num_info ); /* Unloads a currently loaded game. */ RETRO_API void retro_unload_game(void); /* Gets region of game. */ RETRO_API unsigned retro_get_region(void); /* Gets region of memory. */ RETRO_API void *retro_get_memory_data(unsigned id); RETRO_API size_t retro_get_memory_size(unsigned id); #ifdef __cplusplus } #endif #endif