RetroArch/state_manager.h
2020-10-15 06:04:20 +02:00

89 lines
2.4 KiB
C

/* RetroArch - A frontend for libretro.
* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
* Copyright (C) 2011-2017 - Daniel De Matteis
* Copyright (C) 2014-2017 - Alfred Agrell
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __STATE_MANAGER_H
#define __STATE_MANAGER_H
#include <stdint.h>
#include <stddef.h>
#include <boolean.h>
#include <retro_common_api.h>
RETRO_BEGIN_DECLS
struct state_manager
{
uint8_t *data;
/* Reading and writing is done here here. */
uint8_t *head;
/* If head comes close to this, discard a frame. */
uint8_t *tail;
uint8_t *thisblock;
uint8_t *nextblock;
#if STRICT_BUF_SIZE
uint8_t *debugblock;
size_t debugsize;
#endif
size_t capacity;
/* This one is rounded up from reset::blocksize. */
size_t blocksize;
/* size_t + (blocksize + 131071) / 131072 *
* (blocksize + u16 + u16) + u16 + u32 + size_t
* (yes, the math is a bit ugly). */
size_t maxcompsize;
unsigned entries;
bool thisblock_valid;
};
typedef struct state_manager state_manager_t;
struct state_manager_rewind_state
{
/* Rewind support. */
state_manager_t *state;
size_t size;
bool frame_is_reversed;
};
bool state_manager_frame_is_reversed(void);
void state_manager_event_deinit(
struct state_manager_rewind_state *rewind_st);
void state_manager_event_init(struct state_manager_rewind_state *rewind_st,
unsigned rewind_buffer_size);
/**
* check_rewind:
* @pressed : was rewind key pressed or held?
*
* Checks if rewind toggle/hold was being pressed and/or held.
**/
bool state_manager_check_rewind(
struct state_manager_rewind_state *rewind_st,
bool pressed,
unsigned rewind_granularity, bool is_paused,
char *s, size_t len, unsigned *time);
RETRO_END_DECLS
#endif