/* Copyright (C) 2010-2014 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 #include #include #ifdef __cplusplus extern "C" { #endif #ifndef __cplusplus #if defined(_MSC_VER) && !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 #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 // // Libretros fundamental device abstractions. ///////// // // Libretros 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 libretros 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 X/Y coordinates are reported relatively to last poll, similar to mouse. #define RETRO_DEVICE_LIGHTGUN 4 // The ANALOG device is an extension to JOYPAD (RetroPad). // Similar to DualShock it adds two analog sticks. // This is treated as a separate device type as it returns values in the full analog range // of [-0x8000, 0x7fff]. Positive X axis is right. Positive Y axis is down. // Only use ANALOG type when polling for analog values of the axes. #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. #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_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 // Id values for LIGHTGUN types. #define RETRO_DEVICE_ID_LIGHTGUN_X 0 #define RETRO_DEVICE_ID_LIGHTGUN_Y 1 #define RETRO_DEVICE_ID_LIGHTGUN_TRIGGER 2 #define RETRO_DEVICE_ID_LIGHTGUN_CURSOR 3 #define RETRO_DEVICE_ID_LIGHTGUN_TURBO 4 #define RETRO_DEVICE_ID_LIGHTGUN_PAUSE 5 #define RETRO_DEVICE_ID_LIGHTGUN_START 6 // 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 // 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_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 ROMs 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 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 // const char ** -- // Returns the "content" 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 reinit. // This call is not a free pass for not trying to provide correct values in retro_get_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 Nintendos 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. 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 { const char *extension; // The extension associated with a memory type, e.g. "psram". unsigned type; // The memory type for retro_get_memory(). This should be at least 0x100 to avoid conflict with standardized libretro memory types. }; struct retro_subsystem_rom_info { const char *desc; // Describes what the ROM is (SGB bios, GB rom, etc). const char *valid_extensions; // Same definition as retro_get_system_info(). bool need_fullpath; // Same definition as retro_get_system_info(). bool block_extract; // Same definition as retro_get_system_info(). bool required; // This is set if the ROM is required to load a game. If this is set to false, a zeroed-out retro_game_info can be passed. // ROMs can have multiple associated persistent memory types (retro_get_memory()). const struct retro_subsystem_memory_info *memory; unsigned num_memory; }; struct retro_subsystem_info { const char *desc; // Human-readable string of the subsystem type, e.g. "Super GameBoy" // 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 ROM. The first entry is assumed to be the "most significant" ROM for frontend purposes. // E.g. with Super GameBoy, the first ROM should be the GameBoy ROM, as it is the most "significant" ROM to a user. // If a frontend creates new file paths based on the ROM used (e.g. savestates), it should use the path for the first ROM to do so. const struct retro_subsystem_rom_info *roms; unsigned num_roms; // Number of ROMs associated with a subsystem. unsigned id; // The type passed to retro_load_game_special(). }; typedef void (*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_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_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) 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_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_perf_get_counter_t)(void); // Returns a bit-mask of detected CPU features (RETRO_SIMD_*). typedef uint64_t (*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_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_perf_register_t)(struct retro_perf_counter *counter); // Starts and stops a registered counter. typedef void (*retro_perf_start_t)(struct retro_perf_counter *counter); typedef void (*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_set_sensor_state_t)(unsigned port, enum retro_sensor_action action, unsigned rate); typedef float (*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_camera_start_t)(void); // Stops the camera driver. Can only be called in retro_run(). typedef void (*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_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_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_camera_frame_opengl_texture_t)(unsigned texture_id, unsigned texture_target, const float *affine); struct retro_camera_callback { uint64_t caps; // Set by libretro core. Example bitmask: caps = (1 << RETRO_CAMERA_BUFFER_OPENGL_TEXTURE) | (1 << RETRO_CAMERA_BUFFER_RAW_FRAMEBUFFER). unsigned width; // Desired resolution for camera. Is only used as a hint. unsigned height; retro_camera_start_t start; // Set by frontend. retro_camera_stop_t stop; // Set by frontend. retro_camera_frame_raw_framebuffer_t frame_raw_framebuffer; // Set by libretro core if raw framebuffer callbacks will be used. retro_camera_frame_opengl_texture_t frame_opengl_texture; // Set by libretro core if OpenGL texture callbacks will be used. // 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_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_location_start_t)(void); // Stop location services. The device will stop listening for changes to the current // location. typedef void (*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_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_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_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_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_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_frame_time_callback_t)(retro_usec_t usec); struct retro_frame_time_callback { retro_frame_time_callback_t callback; retro_usec_t reference; // 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. }; // 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_hw_context_reset_t)(void); // Gets current framebuffer which is to be rendered to. Could change every frame potentially. typedef uintptr_t (*retro_hw_get_current_framebuffer_t)(void); // Get a symbol from HW context. typedef retro_proc_address_t (*retro_hw_get_proc_address_t)(const char *sym); enum retro_hw_context_type { RETRO_HW_CONTEXT_NONE = 0, RETRO_HW_CONTEXT_OPENGL = 1, // OpenGL 2.x. Driver can choose to use latest compatibility context. RETRO_HW_CONTEXT_OPENGLES2 = 2, // GLES 2.0 RETRO_HW_CONTEXT_OPENGL_CORE = 3, // Modern desktop core GL context. Use version_major/version_minor fields to set GL version. RETRO_HW_CONTEXT_OPENGLES3 = 4, // GLES 3.0 RETRO_HW_CONTEXT_OPENGLES_VERSION = 5, // GLES 3.1+. Set version_major/version_minor. For GLES2 and GLES3, use the corresponding enums directly. RETRO_HW_CONTEXT_DUMMY = INT_MAX }; struct retro_hw_render_callback { enum retro_hw_context_type context_type; // Which API to use. Set by libretro core. // 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; retro_hw_get_current_framebuffer_t get_current_framebuffer; // Set by frontend. retro_hw_get_proc_address_t get_proc_address; // Set by frontend. bool depth; // Set if render buffers should have depth component attached. bool stencil; // Set if stencil buffers should be attached. // If depth and stencil are true, a packed 24/8 buffer will be added. Only attaching stencil is invalid and will be ignored. bool bottom_left_origin; // Use conventional bottom-left origin convention. Is false, standard libretro top-left origin semantics are used. unsigned version_major; // Major version number for core GL context or GLES 3.1+. unsigned version_minor; // Minor version number for core GL context or GLES 3.1+. bool cache_context; // If this is true, the frontend will go very far to avoid resetting context in scenarios like toggling fullscreen, etc. // 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. retro_hw_context_reset_t context_destroy; // A callback to be called before the context is destroyed in a controlled way by the frontend. // 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. bool debug_context; // Creates a 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_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_set_eject_state_t)(bool ejected); // Gets current eject state. The initial state is 'not ejected'. typedef bool (*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_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_set_image_index_t)(unsigned index); // Gets total number of images which are available to use. typedef unsigned (*retro_get_num_images_t)(void); // // 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. struct retro_game_info; typedef bool (*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_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; const char *description; // Human readable description for parameters. // The pointer must remain valid until retro_unload_game() is called. }; 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 rom 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. bool need_fullpath; // 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 block_extract; // If true, the frontend is not allowed to extract any archives before loading the real ROM. // Necessary for certain libretro implementations that load games from zipped archives. }; 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 { const char *key; // 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 *value; // Value to be obtained. If key does not exist, it is set to NULL. }; struct retro_game_info { const char *path; // Path to game, UTF-8 encoded. Usually used as a reference. // May be NULL if rom was loaded from stdin or similar. // retro_system_info::need_fullpath guaranteed 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. }; // Callbacks // // Environment callback. Gives implementations a way of performing uncommon tasks. Extensible. typedef bool (*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_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_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_audio_sample_batch_t)(const int16_t *data, size_t frames); // Polls input. typedef void (*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_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. void retro_set_environment(retro_environment_t); void retro_set_video_refresh(retro_video_refresh_t); void retro_set_audio_sample(retro_audio_sample_t); void retro_set_audio_sample_batch(retro_audio_sample_batch_t); void retro_set_input_poll(retro_input_poll_t); void retro_set_input_state(retro_input_state_t); // Library global initialization/deinitialization. void retro_init(void); void retro_deinit(void); // Must return RETRO_API_VERSION. Used to validate ABI compatibility when the API is revised. 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(). 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. 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. void retro_set_controller_port_device(unsigned port, unsigned device); // Resets the current game. 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. void retro_run(void); // Returns the amount of data the implementation requires to serialize internal state (save states). // Beetween 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. 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. bool retro_serialize(void *data, size_t size); bool retro_unserialize(const void *data, size_t size); void retro_cheat_reset(void); void retro_cheat_set(unsigned index, bool enabled, const char *code); // Loads a game. bool retro_load_game(const struct retro_game_info *game); // Loads a "special" kind of game. Should not be used except in extreme cases. bool retro_load_game_special( unsigned game_type, const struct retro_game_info *info, size_t num_info ); // Unloads a currently loaded game. void retro_unload_game(void); // Gets region of game. unsigned retro_get_region(void); // Gets region of memory. void *retro_get_memory_data(unsigned id); size_t retro_get_memory_size(unsigned id); #ifdef __cplusplus } #endif #endif