1 /* RetroArch - A frontend for libretro. 2 * Copyright (C) 2010-2014 - Hans-Kristian Arntzen 3 * Copyright (C) 2011-2017 - Daniel De Matteis 4 * Copyright (C) 2014-2017 - Alfred Agrell 5 * 6 * RetroArch is free software: you can redistribute it and/or modify it under the terms 7 * of the GNU General Public License as published by the Free Software Found- 8 * ation, either version 3 of the License, or (at your option) any later version. 9 * 10 * RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; 11 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 12 * PURPOSE. See the GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License along with RetroArch. 15 * If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #ifndef __STATE_MANAGER_H 19 #define __STATE_MANAGER_H 20 21 #include <stdint.h> 22 #include <stddef.h> 23 24 #include <boolean.h> 25 #include <retro_common_api.h> 26 27 RETRO_BEGIN_DECLS 28 29 struct state_manager 30 { 31 uint8_t *data; 32 /* Reading and writing is done here here. */ 33 uint8_t *head; 34 /* If head comes close to this, discard a frame. */ 35 uint8_t *tail; 36 37 uint8_t *thisblock; 38 uint8_t *nextblock; 39 #if STRICT_BUF_SIZE 40 uint8_t *debugblock; 41 size_t debugsize; 42 #endif 43 44 size_t capacity; 45 /* This one is rounded up from reset::blocksize. */ 46 size_t blocksize; 47 /* size_t + (blocksize + 131071) / 131072 * 48 * (blocksize + u16 + u16) + u16 + u32 + size_t 49 * (yes, the math is a bit ugly). */ 50 size_t maxcompsize; 51 52 unsigned entries; 53 bool thisblock_valid; 54 }; 55 56 typedef struct state_manager state_manager_t; 57 58 struct state_manager_rewind_state 59 { 60 /* Rewind support. */ 61 state_manager_t *state; 62 size_t size; 63 bool frame_is_reversed; 64 }; 65 66 bool state_manager_frame_is_reversed(void); 67 68 void state_manager_event_deinit( 69 struct state_manager_rewind_state *rewind_st); 70 71 void state_manager_event_init(struct state_manager_rewind_state *rewind_st, 72 unsigned rewind_buffer_size); 73 74 /** 75 * check_rewind: 76 * @pressed : was rewind key pressed or held? 77 * 78 * Checks if rewind toggle/hold was being pressed and/or held. 79 **/ 80 bool state_manager_check_rewind( 81 struct state_manager_rewind_state *rewind_st, 82 bool pressed, 83 unsigned rewind_granularity, bool is_paused, 84 char *s, size_t len, unsigned *time); 85 86 RETRO_END_DECLS 87 88 #endif 89