bool synced_context::can_undo()
{
//this method should only works in a synced context.
assert(is_synced());
//if we called the rng or if we sended data of this action over the network already, undoing is impossible.
return (!is_simultaneously_) && (random_new::generator->get_random_calls() == 0);
}
void calculate_conversion(void)
{
for(i=0; (i < MAX_ENTRIES) && (table[i].state != ENTRY_FULL); ++i);
if (i >= MAX_ENTRIES) return; // table is empty
local_average = table[i].local_time;
offset_average = table[i].time_offset;
local_sum = 0;
offset_sum = 0;
while (++i < MAX_ENTRIES)
{
if (table[i].state == ENTRY_FULL)
{
local_sum +=
(long)(table[i].local_time - local_average) / table_entries;
offset_sum +=
(long)(table[i].time_offset - offset_average) / table_entries;
}
}
local_average += local_sum;
offset_average += offset_sum;
local_sum = offset_sum = 0;
for (i=0; i < MAX_ENTRIES; ++i)
{
if (table[i].state == ENTRY_FULL)
{
a = table[i].local_time - local_average;
b = table[i].time_offset - offset_average;
local_sum += (long long)a * a;
offset_sum += (long long)a * b;
}
}
if (local_sum != 0)
skew = (float)offset_sum / (float)local_sum;
num_entries = table_entries;
PRINTF("FTSP conversion calculated: num_entries=%u, is_synced=%u\n",
num_entries, is_synced());
}
int synced_context::get_unit_id_diff()
{
//this method only works in a synced context.
assert(is_synced());
return resources::gameboard->unit_id_manager().get_save_id() - last_unit_id_;
}
config synced_context::ask_server_choice(const server_choice& sch)
{
if (!is_synced()) {
ERR_REPLAY << "Trying to ask the server for a '" << sch.name() << "' choice in a unsynced context, doing the choice locally. This can cause OOS.\n";
return sch.local_choice();
}
set_is_simultaneously();
resources::controller->increase_server_request_number();
const bool is_mp_game = resources::controller->is_networked_mp();
bool did_require = false;
DBG_REPLAY << "ask_server for random_seed\n";
/*
as soon as random or similar is involved, undoing is impossible.
*/
resources::undo_stack->clear();
/*
there might be speak or similar commands in the replay before the user input.
*/
while(true) {
do_replay_handle();
bool is_replay_end = resources::recorder->at_end();
if (is_replay_end && !is_mp_game)
{
/* The decision is ours, and it will be inserted
into the replay. */
DBG_REPLAY << "MP synchronization: local server choice\n";
leave_synced_context sync;
config cfg = sch.local_choice();
//-1 for "server" todo: change that.
resources::recorder->user_input(sch.name(), cfg, -1);
return cfg;
}
else if(is_replay_end && is_mp_game)
{
DBG_REPLAY << "MP synchronization: remote server choice\n";
//here we can get into the situation that the decision has already been made but not received yet.
synced_context::pull_remote_user_input();
//FIXME: we should call play_controller::play_silce or the application will freeze while waiting for a remote choice.
resources::controller->play_slice();
/*
we don't want to send multiple "require_random" to the server.
*/
if(!did_require)
{
sch.send_request();
did_require = true;
}
SDL_Delay(10);
continue;
}
else if (!is_replay_end)
{
/* The decision has already been made, and must
be extracted from the replay. */
DBG_REPLAY << "MP synchronization: replay server choice\n";
do_replay_handle();
const config *action = resources::recorder->get_next_action();
if (!action)
{
replay::process_error("[" + std::string(sch.name()) + "] expected but none found\n");
resources::recorder->revert_action();
return sch.local_choice();
}
if (!action->has_child(sch.name()))
{
replay::process_error("[" + std::string(sch.name()) + "] expected but none found, found instead:\n " + action->debug() + "\n");
resources::recorder->revert_action();
return sch.local_choice();
}
if((*action)["from_side"].str() != "server" || (*action)["side_invalid"].to_bool(false) )
{
//we can proceed without getting OOS in this case, but allowing this would allow a "player chan choose their attack results in mp" cheat
replay::process_error("wrong from_side or side_invalid this could mean someone wants to cheat\n");
}
return action->child(sch.name());
}
}
}
void add_new_entry(void)
{
free_item = -1;
oldest_item = 0;
age = 0;
oldest_time = 0;
table_entries = 0;
time_error = (long)(local_to_global(msg_rcv.local_time)
- msg_rcv.global_time);
if (is_synced() == FTSP_OK)
{
PRINTF("FTSP synced, error %ld\n", time_error);
if ((time_error > ENTRY_THROWOUT_LIMIT) ||
(-time_error > ENTRY_THROWOUT_LIMIT))
{
PRINTF("(big)\n");
if (++num_errors > 3)
{
PRINTF("FTSP: num_errors > 3 => clear_table()\n");
clear_table();
}
}
else
{
PRINTF("(small)\n");
num_errors = 0;
}
}
else
{
PRINTF("FTSP not synced\n");
}
for (i=0; i < MAX_ENTRIES; ++i)
{
age = msg_rcv.local_time - table[i].local_time;
if (age >= 0x7FFFFFFFL)
table[i].state = ENTRY_EMPTY;
if (table[i].state == ENTRY_EMPTY)
free_item = i;
else
++table_entries;
if (age >= oldest_time)
{
oldest_time = age;
oldest_item = i;
}
}
if (free_item < 0)
free_item = oldest_item;
else
++table_entries;
table[free_item].state = ENTRY_FULL;
table[free_item].local_time = msg_rcv.local_time;
table[free_item].time_offset = msg_rcv.global_time - msg_rcv.local_time;
}