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https://github.com/ekeeke/Genesis-Plus-GX.git
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759 lines
36 KiB
C
Executable File
759 lines
36 KiB
C
Executable File
#ifndef LIBRETRO_H__
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#define LIBRETRO_H__
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#include <stdint.h>
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#include <stddef.h>
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#include <limits.h>
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// Hack applied for MSVC when compiling in C89 mode as it isn't C99 compliant.
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#ifdef __cplusplus
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extern "C" {
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#else
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#if defined(_MSC_VER) && !defined(SN_TARGET_PS3) && !defined(__cplusplus)
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#define bool unsigned char
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#define true 1
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#define false 0
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#else
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#include <stdbool.h>
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#endif
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#endif
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// Used for checking API/ABI mismatches that can break libretro implementations.
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// It is not incremented for compatible changes to the API.
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#define RETRO_API_VERSION 1
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// Libretro's fundamental device abstractions.
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#define RETRO_DEVICE_MASK 0xff
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#define RETRO_DEVICE_NONE 0
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// The JOYPAD is called RetroPad. It is essentially a Super Nintendo controller,
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// but with additional L2/R2/L3/R3 buttons, similar to a PS1 DualShock.
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#define RETRO_DEVICE_JOYPAD 1
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// The mouse is a simple mouse, similar to Super Nintendo's mouse.
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// X and Y coordinates are reported relatively to last poll (poll callback).
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// It is up to the libretro implementation to keep track of where the mouse pointer is supposed to be on the screen.
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// The frontend must make sure not to interfere with its own hardware mouse pointer.
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#define RETRO_DEVICE_MOUSE 2
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// KEYBOARD device lets one poll for raw key pressed.
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// It is poll based, so input callback will return with the current pressed state.
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#define RETRO_DEVICE_KEYBOARD 3
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// Lightgun X/Y coordinates are reported relatively to last poll, similar to mouse.
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#define RETRO_DEVICE_LIGHTGUN 4
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// The ANALOG device is an extension to JOYPAD (RetroPad).
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// Similar to DualShock it adds two analog sticks.
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// This is treated as a separate device type as it returns values in the full analog range
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// of [-0x8000, 0x7fff]. Positive X axis is right. Positive Y axis is down.
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// Only use ANALOG type when polling for analog values of the axes.
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#define RETRO_DEVICE_ANALOG 5
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// Abstracts the concept of a pointing mechanism, e.g. touch.
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// This allows libretro to query in absolute coordinates where on the screen a mouse (or something similar) is being placed.
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// For a touch centric device, coordinates reported are the coordinates of the press.
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//
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// Coordinates in X and Y are reported as:
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// [-0x7fff, 0x7fff]: -0x7fff corresponds to the far left/top of the screen,
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// and 0x7fff corresponds to the far right/bottom of the screen.
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// The "screen" is here defined as area that is passed to the frontend and later displayed on the monitor.
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// The frontend is free to scale/resize this screen as it sees fit, however,
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// (X, Y) = (-0x7fff, -0x7fff) will correspond to the top-left pixel of the game image, etc.
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//
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// To check if the pointer coordinates are valid (e.g. a touch display actually being touched),
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// PRESSED returns 1 or 0.
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// If using a mouse, PRESSED will usually correspond to the left mouse button.
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// PRESSED will only return 1 if the pointer is inside the game screen.
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//
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// For multi-touch, the index variable can be used to successively query more presses.
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// If index = 0 returns true for _PRESSED, coordinates can be extracted
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// with _X, _Y for index = 0. One can then query _PRESSED, _X, _Y with index = 1, and so on.
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// Eventually _PRESSED will return false for an index. No further presses are registered at this point.
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#define RETRO_DEVICE_POINTER 6
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// These device types are specializations of the base types above.
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// They should only be used in retro_set_controller_type() to inform libretro implementations
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// about use of a very specific device type.
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//
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// In input state callback, however, only the base type should be used in the 'device' field.
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#define RETRO_DEVICE_JOYPAD_MULTITAP ((1 << 8) | RETRO_DEVICE_JOYPAD)
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#define RETRO_DEVICE_LIGHTGUN_SUPER_SCOPE ((1 << 8) | RETRO_DEVICE_LIGHTGUN)
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#define RETRO_DEVICE_LIGHTGUN_JUSTIFIER ((2 << 8) | RETRO_DEVICE_LIGHTGUN)
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#define RETRO_DEVICE_LIGHTGUN_JUSTIFIERS ((3 << 8) | RETRO_DEVICE_LIGHTGUN)
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// Buttons for the RetroPad (JOYPAD).
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// The placement of these is equivalent to placements on the Super Nintendo controller.
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// L2/R2/L3/R3 buttons correspond to the PS1 DualShock.
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#define RETRO_DEVICE_ID_JOYPAD_B 0
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#define RETRO_DEVICE_ID_JOYPAD_Y 1
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#define RETRO_DEVICE_ID_JOYPAD_SELECT 2
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#define RETRO_DEVICE_ID_JOYPAD_START 3
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#define RETRO_DEVICE_ID_JOYPAD_UP 4
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#define RETRO_DEVICE_ID_JOYPAD_DOWN 5
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#define RETRO_DEVICE_ID_JOYPAD_LEFT 6
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#define RETRO_DEVICE_ID_JOYPAD_RIGHT 7
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#define RETRO_DEVICE_ID_JOYPAD_A 8
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#define RETRO_DEVICE_ID_JOYPAD_X 9
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#define RETRO_DEVICE_ID_JOYPAD_L 10
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#define RETRO_DEVICE_ID_JOYPAD_R 11
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#define RETRO_DEVICE_ID_JOYPAD_L2 12
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#define RETRO_DEVICE_ID_JOYPAD_R2 13
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#define RETRO_DEVICE_ID_JOYPAD_L3 14
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#define RETRO_DEVICE_ID_JOYPAD_R3 15
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// Index / Id values for ANALOG device.
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#define RETRO_DEVICE_INDEX_ANALOG_LEFT 0
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#define RETRO_DEVICE_INDEX_ANALOG_RIGHT 1
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#define RETRO_DEVICE_ID_ANALOG_X 0
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#define RETRO_DEVICE_ID_ANALOG_Y 1
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// Id values for MOUSE.
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#define RETRO_DEVICE_ID_MOUSE_X 0
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#define RETRO_DEVICE_ID_MOUSE_Y 1
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#define RETRO_DEVICE_ID_MOUSE_LEFT 2
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#define RETRO_DEVICE_ID_MOUSE_RIGHT 3
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// Id values for LIGHTGUN types.
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#define RETRO_DEVICE_ID_LIGHTGUN_X 0
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#define RETRO_DEVICE_ID_LIGHTGUN_Y 1
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#define RETRO_DEVICE_ID_LIGHTGUN_TRIGGER 2
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#define RETRO_DEVICE_ID_LIGHTGUN_CURSOR 3
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#define RETRO_DEVICE_ID_LIGHTGUN_TURBO 4
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#define RETRO_DEVICE_ID_LIGHTGUN_PAUSE 5
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#define RETRO_DEVICE_ID_LIGHTGUN_START 6
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// Id values for POINTER.
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#define RETRO_DEVICE_ID_POINTER_X 0
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#define RETRO_DEVICE_ID_POINTER_Y 1
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#define RETRO_DEVICE_ID_POINTER_PRESSED 2
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// Returned from retro_get_region().
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#define RETRO_REGION_NTSC 0
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#define RETRO_REGION_PAL 1
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// Passed to retro_get_memory_data/size().
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// If the memory type doesn't apply to the implementation NULL/0 can be returned.
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#define RETRO_MEMORY_MASK 0xff
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// Regular save ram. This ram is usually found on a game cartridge, backed up by a battery.
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// If save game data is too complex for a single memory buffer,
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// the SYSTEM_DIRECTORY environment callback can be used.
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#define RETRO_MEMORY_SAVE_RAM 0
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// Some games have a built-in clock to keep track of time.
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// This memory is usually just a couple of bytes to keep track of time.
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#define RETRO_MEMORY_RTC 1
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// System ram lets a frontend peek into a game systems main RAM.
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#define RETRO_MEMORY_SYSTEM_RAM 2
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// Video ram lets a frontend peek into a game systems video RAM (VRAM).
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#define RETRO_MEMORY_VIDEO_RAM 3
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// Special memory types.
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#define RETRO_MEMORY_SNES_BSX_RAM ((1 << 8) | RETRO_MEMORY_SAVE_RAM)
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#define RETRO_MEMORY_SNES_BSX_PRAM ((2 << 8) | RETRO_MEMORY_SAVE_RAM)
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#define RETRO_MEMORY_SNES_SUFAMI_TURBO_A_RAM ((3 << 8) | RETRO_MEMORY_SAVE_RAM)
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#define RETRO_MEMORY_SNES_SUFAMI_TURBO_B_RAM ((4 << 8) | RETRO_MEMORY_SAVE_RAM)
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#define RETRO_MEMORY_SNES_GAME_BOY_RAM ((5 << 8) | RETRO_MEMORY_SAVE_RAM)
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#define RETRO_MEMORY_SNES_GAME_BOY_RTC ((6 << 8) | RETRO_MEMORY_RTC)
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// Special game types passed into retro_load_game_special().
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// Only used when multiple ROMs are required.
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#define RETRO_GAME_TYPE_BSX 0x101
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#define RETRO_GAME_TYPE_BSX_SLOTTED 0x102
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#define RETRO_GAME_TYPE_SUFAMI_TURBO 0x103
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#define RETRO_GAME_TYPE_SUPER_GAME_BOY 0x104
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// Keysyms used for ID in input state callback when polling RETRO_KEYBOARD.
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enum retro_key
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{
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RETROK_UNKNOWN = 0,
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RETROK_FIRST = 0,
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RETROK_BACKSPACE = 8,
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RETROK_TAB = 9,
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RETROK_CLEAR = 12,
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RETROK_RETURN = 13,
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RETROK_PAUSE = 19,
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RETROK_ESCAPE = 27,
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RETROK_SPACE = 32,
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RETROK_EXCLAIM = 33,
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RETROK_QUOTEDBL = 34,
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RETROK_HASH = 35,
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RETROK_DOLLAR = 36,
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RETROK_AMPERSAND = 38,
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RETROK_QUOTE = 39,
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RETROK_LEFTPAREN = 40,
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RETROK_RIGHTPAREN = 41,
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RETROK_ASTERISK = 42,
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RETROK_PLUS = 43,
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RETROK_COMMA = 44,
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RETROK_MINUS = 45,
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RETROK_PERIOD = 46,
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RETROK_SLASH = 47,
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RETROK_0 = 48,
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RETROK_1 = 49,
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RETROK_2 = 50,
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RETROK_3 = 51,
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RETROK_4 = 52,
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RETROK_5 = 53,
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RETROK_6 = 54,
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RETROK_7 = 55,
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RETROK_8 = 56,
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RETROK_9 = 57,
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RETROK_COLON = 58,
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RETROK_SEMICOLON = 59,
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RETROK_LESS = 60,
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RETROK_EQUALS = 61,
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RETROK_GREATER = 62,
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RETROK_QUESTION = 63,
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RETROK_AT = 64,
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RETROK_LEFTBRACKET = 91,
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RETROK_BACKSLASH = 92,
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RETROK_RIGHTBRACKET = 93,
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RETROK_CARET = 94,
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RETROK_UNDERSCORE = 95,
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RETROK_BACKQUOTE = 96,
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RETROK_a = 97,
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RETROK_b = 98,
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RETROK_c = 99,
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RETROK_d = 100,
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RETROK_e = 101,
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RETROK_f = 102,
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RETROK_g = 103,
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RETROK_h = 104,
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RETROK_i = 105,
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RETROK_j = 106,
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RETROK_k = 107,
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RETROK_l = 108,
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RETROK_m = 109,
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RETROK_n = 110,
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RETROK_o = 111,
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RETROK_p = 112,
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RETROK_q = 113,
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RETROK_r = 114,
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RETROK_s = 115,
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RETROK_t = 116,
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RETROK_u = 117,
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RETROK_v = 118,
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RETROK_w = 119,
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RETROK_x = 120,
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RETROK_y = 121,
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RETROK_z = 122,
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RETROK_DELETE = 127,
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RETROK_KP0 = 256,
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RETROK_KP1 = 257,
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RETROK_KP2 = 258,
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RETROK_KP3 = 259,
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RETROK_KP4 = 260,
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RETROK_KP5 = 261,
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RETROK_KP6 = 262,
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RETROK_KP7 = 263,
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RETROK_KP8 = 264,
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RETROK_KP9 = 265,
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RETROK_KP_PERIOD = 266,
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RETROK_KP_DIVIDE = 267,
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RETROK_KP_MULTIPLY = 268,
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RETROK_KP_MINUS = 269,
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RETROK_KP_PLUS = 270,
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RETROK_KP_ENTER = 271,
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RETROK_KP_EQUALS = 272,
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RETROK_UP = 273,
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RETROK_DOWN = 274,
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RETROK_RIGHT = 275,
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RETROK_LEFT = 276,
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RETROK_INSERT = 277,
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RETROK_HOME = 278,
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RETROK_END = 279,
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RETROK_PAGEUP = 280,
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RETROK_PAGEDOWN = 281,
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RETROK_F1 = 282,
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RETROK_F2 = 283,
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RETROK_F3 = 284,
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RETROK_F4 = 285,
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RETROK_F5 = 286,
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RETROK_F6 = 287,
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RETROK_F7 = 288,
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RETROK_F8 = 289,
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RETROK_F9 = 290,
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RETROK_F10 = 291,
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RETROK_F11 = 292,
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RETROK_F12 = 293,
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RETROK_F13 = 294,
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RETROK_F14 = 295,
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RETROK_F15 = 296,
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RETROK_NUMLOCK = 300,
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RETROK_CAPSLOCK = 301,
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RETROK_SCROLLOCK = 302,
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RETROK_RSHIFT = 303,
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RETROK_LSHIFT = 304,
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RETROK_RCTRL = 305,
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RETROK_LCTRL = 306,
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RETROK_RALT = 307,
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RETROK_LALT = 308,
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RETROK_RMETA = 309,
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RETROK_LMETA = 310,
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RETROK_LSUPER = 311,
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RETROK_RSUPER = 312,
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RETROK_MODE = 313,
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RETROK_COMPOSE = 314,
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RETROK_HELP = 315,
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RETROK_PRINT = 316,
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RETROK_SYSREQ = 317,
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RETROK_BREAK = 318,
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RETROK_MENU = 319,
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RETROK_POWER = 320,
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RETROK_EURO = 321,
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RETROK_UNDO = 322,
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RETROK_LAST,
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RETROK_DUMMY = INT_MAX // Ensure sizeof(enum) == sizeof(int)
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};
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enum retro_mod
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{
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RETROKMOD_NONE = 0x0000,
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RETROKMOD_SHIFT = 0x01,
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RETROKMOD_CTRL = 0x02,
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RETROKMOD_ALT = 0x04,
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RETROKMOD_META = 0x08,
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RETROKMOD_NUMLOCK = 0x10,
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RETROKMOD_CAPSLOCK = 0x20,
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RETROKMOD_SCROLLOCK = 0x40,
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RETROKMOD_DUMMY = INT_MAX // Ensure sizeof(enum) == sizeof(int)
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};
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// If set, this call is not part of the public libretro API yet. It can change or be removed at any time.
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#define RETRO_ENVIRONMENT_EXPERIMENTAL 0x10000
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// Environment commands.
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#define RETRO_ENVIRONMENT_SET_ROTATION 1 // const unsigned * --
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// Sets screen rotation of graphics.
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// Is only implemented if rotation can be accelerated by hardware.
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// Valid values are 0, 1, 2, 3, which rotates screen by 0, 90, 180, 270 degrees
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// counter-clockwise respectively.
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//
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#define RETRO_ENVIRONMENT_GET_OVERSCAN 2 // bool * --
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// Boolean value whether or not the implementation should use overscan, or crop away overscan.
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//
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#define RETRO_ENVIRONMENT_GET_CAN_DUPE 3 // bool * --
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// Boolean value whether or not frontend supports frame duping,
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// passing NULL to video frame callback.
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//
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// Environ 4, 5 are no longer supported (GET_VARIABLE / SET_VARIABLES), and reserved to avoid possible ABI clash.
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#define RETRO_ENVIRONMENT_SET_MESSAGE 6 // const struct retro_message * --
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// Sets a message to be displayed in implementation-specific manner for a certain amount of 'frames'.
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// Should not be used for trivial messages, which should simply be logged to stderr.
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#define RETRO_ENVIRONMENT_SHUTDOWN 7 // N/A (NULL) --
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// Requests the frontend to shutdown.
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// Should only be used if game has a specific
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// way to shutdown the game from a menu item or similar.
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//
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#define RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL 8
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// const unsigned * --
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// Gives a hint to the frontend how demanding this implementation
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// is on a system. E.g. reporting a level of 2 means
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// this implementation should run decently on all frontends
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// of level 2 and up.
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//
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// It can be used by the frontend to potentially warn
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// about too demanding implementations.
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//
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// The levels are "floating", but roughly defined as:
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// 0: Low-powered embedded devices such as Raspberry Pi
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// 1: 6th generation consoles, such as Wii/Xbox 1, and phones, tablets, etc.
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// 2: 7th generation consoles, such as PS3/360, with sub-par CPUs.
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// 3: Modern desktop/laptops with reasonably powerful CPUs.
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// 4: High-end desktops with very powerful CPUs.
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//
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// This function can be called on a per-game basis,
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// as certain games an implementation can play might be
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// particularily demanding.
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// If called, it should be called in retro_load_game().
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//
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#define RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY 9
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// const char ** --
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// Returns the "system" directory of the frontend.
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// This directory can be used to store system specific ROMs such as BIOSes, configuration data, etc.
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// The returned value can be NULL.
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// If so, no such directory is defined,
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// and it's up to the implementation to find a suitable directory.
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//
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#define RETRO_ENVIRONMENT_SET_PIXEL_FORMAT 10
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// const enum retro_pixel_format * --
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// Sets the internal pixel format used by the implementation.
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// The default pixel format is RETRO_PIXEL_FORMAT_0RGB1555.
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// This pixel format however, is deprecated (see enum retro_pixel_format).
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// If the call returns false, the frontend does not support this pixel format.
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// This function should be called inside retro_load_game() or retro_get_system_av_info().
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//
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#define RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS 11
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// const struct retro_input_descriptor * --
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// Sets an array of retro_input_descriptors.
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// It is up to the frontend to present this in a usable way.
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// The array is terminated by retro_input_descriptor::description being set to NULL.
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// This function can be called at any time, but it is recommended to call it as early as possible.
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#define RETRO_ENVIRONMENT_SET_KEYBOARD_CALLBACK 12
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// const struct retro_keyboard_callback * --
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// Sets a callback function used to notify core about keyboard events.
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//
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#define RETRO_ENVIRONMENT_SET_DISK_CONTROL_INTERFACE 13
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// const struct retro_disk_control_callback * --
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// Sets an interface which frontend can use to eject and insert disk images.
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// This is used for games which consist of multiple images and must be manually
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// swapped out by the user (e.g. PSX).
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#define RETRO_ENVIRONMENT_SET_HW_RENDER (14 | RETRO_ENVIRONMENT_EXPERIMENTAL)
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// struct retro_hw_render_callback * --
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// NOTE: This call is currently very experimental, and should not be considered part of the public API.
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// The interface could be changed or removed at any time.
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// Sets an interface to let a libretro core render with hardware acceleration.
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// Should be called in retro_load_game().
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// If successful, libretro cores will be able to render to a frontend-provided framebuffer.
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// The size of this framebuffer will be at least as large as max_width/max_height provided in get_av_info().
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// 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 aquire 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.
|
|
|
|
// 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.
|
|
// 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 init 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 void (*retro_proc_address_t)(void);
|
|
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, // OpenGL 2.x. Latest version available before 3.x+.
|
|
RETRO_HW_CONTEXT_OPENGLES2, // GLES 2.0
|
|
|
|
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.
|
|
retro_hw_context_reset_t context_reset; // Set by libretro core.
|
|
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.
|
|
};
|
|
|
|
// 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.
|
|
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'.
|
|
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
|