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67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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* Copyright (C) 2011-2016 - Daniel De Matteis
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* Copyright (C) 2016 - Gregor Richards
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <boolean.h>
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#include <encodings/crc32.h>
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#include "netplay_private.h"
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/**
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* netplay_delta_frame_ready
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*
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* Prepares, if possible, a delta frame for input, and reports whether it is
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* ready.
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*
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* Returns: True if the delta frame is ready for input at the given frame,
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* false otherwise.
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*/
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bool netplay_delta_frame_ready(netplay_t *netplay, struct delta_frame *delta,
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uint32_t frame)
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{
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void *remember_state;
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if (delta->used)
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{
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if (delta->frame == frame) return true;
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if (netplay->other_frame_count <= delta->frame)
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{
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/* We haven't even replayed this frame yet, so we can't overwrite it! */
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return false;
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}
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}
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remember_state = delta->state;
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memset(delta, 0, sizeof(struct delta_frame));
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delta->used = true;
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delta->frame = frame;
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delta->state = remember_state;
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return true;
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}
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/**
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* netplay_delta_frame_crc
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*
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* Get the CRC for the serialization of this frame.
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*/
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uint32_t netplay_delta_frame_crc(netplay_t *netplay, struct delta_frame *delta)
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{
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if (!netplay->state_size)
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return 0;
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return encoding_crc32(0L, (const unsigned char*)delta->state, netplay->state_size);
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}
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