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https://github.com/ekeeke/Genesis-Plus-GX.git
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334 lines
16 KiB
C
Executable File
334 lines
16 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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#ifdef __cplusplus
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extern "C" {
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#else
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#if defined(_MSC_VER) && !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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#define RETRO_API_VERSION 1
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#define RETRO_DEVICE_MASK 0xff
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#define RETRO_DEVICE_NONE 0
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#define RETRO_DEVICE_JOYPAD 1
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#define RETRO_DEVICE_MOUSE 2
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#define RETRO_DEVICE_KEYBOARD 3
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#define RETRO_DEVICE_LIGHTGUN 4
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#define RETRO_DEVICE_ANALOG 5
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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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#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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#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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#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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#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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#define RETRO_REGION_NTSC 0
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#define RETRO_REGION_PAL 1
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#define RETRO_MEMORY_MASK 0xff
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#define RETRO_MEMORY_SAVE_RAM 0
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#define RETRO_MEMORY_RTC 1
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#define RETRO_MEMORY_SYSTEM_RAM 2
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#define RETRO_MEMORY_VIDEO_RAM 3
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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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#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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// 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 RetroArch supports frame duping,
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// passing NULL to video frame callback.
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//
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#define RETRO_ENVIRONMENT_GET_VARIABLE 4 // struct retro_variable * --
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// Interface to aquire user-defined information from environment
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// that cannot feasibly be supported in a multi-system way.
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// Mostly used for obscure,
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// specific features that the user can tap into when neseccary.
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//
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#define RETRO_ENVIRONMENT_SET_VARIABLES 5 // const struct retro_variable * --
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// Allows an implementation to signal the environment
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// which variables it might want to check for later using GET_VARIABLE.
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// 'data' points to an array of retro_variable structs terminated by a { NULL, NULL } element.
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// retro_variable::value should contain a human readable description of the key.
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//
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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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// 1: Low-powered devices such as Raspberry Pi, smart phones, tablets, etc.
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// 2: Medium-spec 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_XRGB1555.
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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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enum retro_pixel_format
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{
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RETRO_PIXEL_FORMAT_0RGB1555 = 0, // 0RGB1555, native endian. 0 bit must be set to 0.
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RETRO_PIXEL_FORMAT_XRGB8888 // XRGB8888, native endian. X bits are ignored.
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};
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struct retro_message
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{
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const char *msg; // Message to be displayed.
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unsigned frames; // Duration in frames of message.
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};
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struct retro_system_info
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{
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const char *library_name; // Descriptive name of library. Should not contain any version numbers, etc.
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const char *library_version; // Descriptive version of core.
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const char *valid_extensions; // A string listing probably rom extensions the core will be able to load, separated with pipe.
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// I.e. "bin|rom|iso".
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// Typically used for a GUI to filter out extensions.
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bool need_fullpath; // If true, retro_load_game() is guaranteed to provide a valid pathname in retro_game_info::path.
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// ::data and ::size are both invalid.
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// If false, ::data and ::size are guaranteed to be valid, but ::path might not be valid.
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// This is typically set to true for libretro implementations that must load from file.
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// Implementations should strive for setting this to false, as it allows the frontend to perform patching, etc.
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bool block_extract; // If true, the frontend is not allowed to extract any archives before loading the real ROM.
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// Necessary for certain libretro implementations that load games from zipped archives.
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};
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struct retro_game_geometry
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{
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unsigned base_width; // Nominal video width of game.
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unsigned base_height; // Nominal video height of game.
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unsigned max_width; // Maximum possible width of game.
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unsigned max_height; // Maximum possible height of game.
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float aspect_ratio; // Nominal aspect ratio of game. If aspect_ratio is <= 0.0,
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// an aspect ratio of base_width / base_height is assumed.
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// A frontend could override this setting if desired.
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};
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struct retro_system_timing
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{
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double fps; // FPS of video content.
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double sample_rate; // Sampling rate of audio.
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};
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struct retro_system_av_info
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{
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struct retro_game_geometry geometry;
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struct retro_system_timing timing;
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};
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struct retro_variable
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{
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const char *key; // Variable to query in RETRO_ENVIRONMENT_GET_VARIABLE.
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// If NULL, obtains the complete environment string if more complex parsing is necessary.
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// The environment string is formatted as key-value pairs delimited by semicolons as so:
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// "key1=value1;key2=value2;..."
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const char *value; // Value to be obtained. If key does not exist, it is set to NULL.
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};
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struct retro_game_info
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{
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const char *path; // Path to game, UTF-8 encoded. Usually used as a reference.
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// May be NULL if rom was loaded from stdin or similar.
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// retro_system_info::need_fullpath guaranteed that this path is valid.
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const void *data; // Memory buffer of loaded game. Will be NULL if need_fullpath was set.
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size_t size; // Size of memory buffer.
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const char *meta; // String of implementation specific meta-data.
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};
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// Callbacks
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//
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// Environment callback. Gives implementations a way of performing uncommon tasks. Extensible.
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typedef bool (*retro_environment_t)(unsigned cmd, void *data);
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// Render a frame. Pixel format is 15-bit 0RGB1555 native endian unless changed (see RETRO_ENVIRONMENT_SET_PIXEL_FORMAT).
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// Width and height specify dimensions of buffer.
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// Pitch specifices length in bytes between two lines in buffer.
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typedef void (*retro_video_refresh_t)(const void *data, unsigned width, unsigned height, size_t pitch);
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// Renders a single audio frame. Should only be used if implementation generates a single sample at a time.
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// Format is signed 16-bit native endian.
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typedef void (*retro_audio_sample_t)(int16_t left, int16_t right);
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// Renders multiple audio frames in one go. One frame is defined as a sample of left and right channels, interleaved.
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// I.e. int16_t buf[4] = { l, r, l, r }; would be 2 frames.
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// Only one of the audio callbacks must ever be used.
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typedef size_t (*retro_audio_sample_batch_t)(const int16_t *data, size_t frames);
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// Polls input.
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typedef void (*retro_input_poll_t)(void);
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// Queries for input for player 'port'. device will be masked with RETRO_DEVICE_MASK.
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// Specialization of devices such as RETRO_DEVICE_JOYPAD_MULTITAP that have been set with retro_set_controller_port_device()
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// will still use the higher level RETRO_DEVICE_JOYPAD to request input.
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typedef int16_t (*retro_input_state_t)(unsigned port, unsigned device, unsigned index, unsigned id);
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// Sets callbacks. retro_set_environment() is guaranteed to be called before retro_init().
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// The rest of the set_* functions are guaranteed to have been called before the first call to retro_run() is made.
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void retro_set_environment(retro_environment_t);
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void retro_set_video_refresh(retro_video_refresh_t);
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void retro_set_audio_sample(retro_audio_sample_t);
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void retro_set_audio_sample_batch(retro_audio_sample_batch_t);
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void retro_set_input_poll(retro_input_poll_t);
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void retro_set_input_state(retro_input_state_t);
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// Library global initialization/deinitialization.
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void retro_init(void);
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void retro_deinit(void);
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// Must return RETRO_API_VERSION. Used to validate ABI compatibility when the API is revised.
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unsigned retro_api_version(void);
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// Gets statically known system info. Pointers provided in *info must be statically allocated.
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// Can be called at any time, even before retro_init().
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void retro_get_system_info(struct retro_system_info *info);
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// Gets information about system audio/video timings and geometry.
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// Can be called only after retro_load_game() has successfully completed.
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void retro_get_system_av_info(struct retro_system_av_info *info);
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// Sets device to be used for player 'port'.
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void retro_set_controller_port_device(unsigned port, unsigned device);
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// Resets the current game.
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void retro_reset(void);
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// Runs the game for one video frame.
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// During retro_run(), input_poll callback must be called at least once.
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//
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// If a frame is not rendered for reasons where a game "dropped" a frame,
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// this still counts as a frame, and retro_run() should explicitly dupe a frame if GET_CAN_DUPE returns true.
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// In this case, the video callback can take a NULL argument for data.
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void retro_run(void);
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// Returns the amount of data the implementation requires to serialize internal state (save states).
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// 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
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// ensure that the frontend can allocate a save state buffer once.
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size_t retro_serialize_size(void);
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// Serializes internal state. If failed, or size is lower than retro_serialize_size(), it should return false, true otherwise.
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bool retro_serialize(void *data, size_t size);
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bool retro_unserialize(const void *data, size_t size);
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void retro_cheat_reset(void);
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void retro_cheat_set(unsigned index, bool enabled, const char *code);
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// Loads a game.
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bool retro_load_game(const struct retro_game_info *game);
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// Loads a "special" kind of game. Should not be used except in extreme cases.
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bool retro_load_game_special(
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unsigned game_type,
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const struct retro_game_info *info, size_t num_info
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);
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// Unloads a currently loaded game.
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void retro_unload_game(void);
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// Gets region of game.
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unsigned retro_get_region(void);
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// Gets region of memory.
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void *retro_get_memory_data(unsigned id);
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size_t retro_get_memory_size(unsigned id);
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#ifdef __cplusplus
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}
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#endif
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#endif
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