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/*
* Copyright 2006 Serge van den Boom <svdb@stack.nl>
*
* This program 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 Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define PORT_WANT_ERRNO
#include "port.h"
#include "netplay.h"
#include "netinput.h"
#include "../../intel.h"
// for NETWORK_CONTROL
#include "../../setup.h"
// For PlayerControl
#include "libs/log.h"
#include <errno.h>
#include <stdlib.h>
static BattleInputBuffer battleInputBuffers[NUM_PLAYERS];
static size_t BattleInput_inputDelay;
// Call before initBattleInputBuffers()
void
setBattleInputDelay(size_t delay) {
BattleInput_inputDelay = delay;
}
size_t
getBattleInputDelay(void) {
return BattleInput_inputDelay;
}
static void
BattleInputBuffer_init(BattleInputBuffer *bib, size_t bufSize) {
bib->buf = malloc(bufSize * sizeof (BATTLE_INPUT_STATE));
bib->maxSize = bufSize;
bib->first = 0;
bib->size = 0;
}
static void
BattleInputBuffer_uninit(BattleInputBuffer *bib) {
if (bib->buf != NULL) {
free(bib->buf);
bib->buf = NULL;
}
bib->maxSize = 0;
bib->first = 0;
bib->size = 0;
}
void
initBattleInputBuffers(void) {
size_t player;
int bufSize = BattleInput_inputDelay * 2 + 2;
// The input of frame n will be processed in frame 'n + delay'.
//
// In the worst case, side 1 processes frames 'n' through 'n + delay - 1',
// then blocks in frame 'n + delay'.
// Then side 2 receives all this input, and progresses to 'delay' frames
// after the last frame the received input originated from, and blocks
// in the frame after it.
// So it sent input for frames 'n' through 'n + delay + delay + 1'.
// The input for these '2*delay + 2' frames are still
// unhandled by side 1, so it needs buffer space for this.
//
// Initially the buffer is filled with inputDelay zeroes,
// so that a party can process at least that much frames.
for (player = 0; player < NUM_PLAYERS; player++)
{
BattleInputBuffer *bib = &battleInputBuffers[player];
BattleInputBuffer_init(bib, bufSize);
{
// Initially a party must be able to process at least inputDelay
// frames, so we fill the buffer with inputDelay zeros.
size_t i;
for (i = 0; i < BattleInput_inputDelay; i++)
BattleInputBuffer_push(bib, (BATTLE_INPUT_STATE) 0);
}
}
}
void
uninitBattleInputBuffers(void)
{
size_t player;
for (player = 0; player < NUM_PLAYERS; player++)
{
BattleInputBuffer *bib;
bib = &battleInputBuffers[player];
BattleInputBuffer_uninit(bib);
}
}
// On error, returns false and sets errno.
bool
BattleInputBuffer_push(BattleInputBuffer *bib, BATTLE_INPUT_STATE input)
{
size_t next;
if (bib->size == bib->maxSize) {
// No more space.
log_add(log_Error, "NETPLAY: battleInputBuffer full.\n");
errno = ENOBUFS;
return false;
}
next = (bib->first + bib->size) % bib->maxSize;
bib->buf[next] = input;
bib->size++;
return true;
}
// On error, returns false and sets errno, and *input remains unchanged.
bool
BattleInputBuffer_pop(BattleInputBuffer *bib, BATTLE_INPUT_STATE *input)
{
if (bib->size == 0)
{
// Buffer is empty.
errno = EAGAIN;
return false;
}
*input = bib->buf[bib->first];
bib->first = (bib->first + 1) % bib->maxSize;
bib->size--;
return true;
}
BattleInputBuffer *
getBattleInputBuffer(size_t player) {
return &battleInputBuffers[player];
}
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