TurnManager.h File Reference

#include "ps/CStr.h"
#include "simulation2/helpers/SimulationCommand.h"
#include <list>
#include <map>
#include <vector>
#include <deque>

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Classes
class	CTurnManager
	Common turn system (used by clients and offline games). More...

Variables
constexpr u32	DEFAULT_TURN_LENGTH = 200
	This file defines the base class of the turn managers for clients, local games and replays. More...
constexpr u32	COMMAND_DELAY_SP = 1
	In single-player, commands are directly scheduled for the next turn. More...
constexpr u32	COMMAND_DELAY_MP = 4
	In multi-player, clients can only compute turn N if all clients have finished sending commands for it, i.e. More...

Variable Documentation

COMMAND_DELAY_MP

constexpr u32 COMMAND_DELAY_MP = 4

inline

In multi-player, clients can only compute turn N if all clients have finished sending commands for it, i.e.

N < CurrentTurn + COMMAND_DELAY for all clients. Commands are sent from client to server to client, and both client and network can lag. If a client reaches turn CURRENT_TURN + COMMAND_DELAY - 1, it'll freeze while waiting for commands. To avoid that, we increase the command-delay to make sure that in general players will have received all commands by the time they reach a given turn. Keep in mind the minimum delay is one turn. This value should be as low as possible while avoiding 'freezing' in general usage. TODO:

• this command-delay could vary based on server-client pings
• it ought be possible to send commands in a P2P fashion (with server verification), which would lower the ping.

COMMAND_DELAY_SP

constexpr u32 COMMAND_DELAY_SP = 1

inline

In single-player, commands are directly scheduled for the next turn.

DEFAULT_TURN_LENGTH

constexpr u32 DEFAULT_TURN_LENGTH = 200

inline

This file defines the base class of the turn managers for clients, local games and replays.

The basic idea of our turn managing system across a network is as in this article: http://www.gamasutra.com/view/feature/3094/1500_archers_on_a_288_network_.php?print=1

Each player performs the simulation for turn N. User input is translated into commands scheduled for execution in turn N+2 which are distributed to all other clients. After a while, a client wants to perform the simulation for turn N+1, which first requires that it has all the other clients' commands for turn N+1. In that case, it does the simulation and tells all the other clients (via the server) it has finished sending commands for turn N+2, and it starts sending commands for turn N+3.

Commands are redistributed immediately by the server. To ensure a consistent execution of commands, they are each associated with a client session ID (which is globally unique and consistent), which is used to sort them. Default turn length in SP & MP. This value should be as low as possible, while not introducing un-necessary lag.