Sly 2:Game state: Difference between revisions

The '''Gamegame state''' refers tois the current state of objectseverything in the the game world. It was the subject of a 2005 GDC presentation by Bruce Oberg, the Principal Engineer at Sucker Punch.<ref>[https://www.gdcvault.com/play/1020295/The-Picture-Worth-a-Thousand The Picture Worth a Thousand Bugs] - YouTube, 3 April 2021 (archived from a 2005 GDC conference)</ref>

The current game state is represented by a '''D'''irecteddirected '''A'''cyclicacyclic graph'''G'''raph, or ('''DAG'''), which is a data structure comprised of a directed graph with no cycles. Each node on the DAG is called a ''{{Sly 2|Task|task''}}. For example, <tt>t1_follow_dmitri_on_streets</tt> is the task of tailing Dimitri in the "Follow Dimitri" job (the prefix <tt>t1</tt> indicates that it is a task in Episode 1, and <tt>follow</tt> is the codename for the "Follow Dimitri" job).

At all times, every task ''before'' an Available task must be Complete or Final. Additionally, every task ''after'' an Available task must be unavailable. It is possible to ''"force''" a task to a particular state, which propagates throughout the DAG to ensure those conditions are always met.

== Missions ==

Tasks are grouped into ''{{Sly 2|Mission|missions''}}, where each mission is typically one particular job in the story. For instance, <tt>m1_follow</tt>{{check}} is the job "Follow Dmitri". The prefix <tt>m1</tt> indicates that it is a mission in Episode 1, and <tt>follow</tt> is the codename for the mission.

If a task belongs to a mission and the ''"exit task''" in that mission is Completed, then all the tasks in that job become Final.

== Checkpoints ==

A task is considered a ''"checkpoint task''" if it has some {{Sly 2|Checkpoint|checkpoint data}} associated with it, including a particular character and location in the game world. When a checkpoint task becomes Available that checkpoint is set as the ''latest'' checkpoint.

== Rollbacks ==

* Resetting the world

* Placing the player at the latest checkpoint

* Forcing the checkpoint task to Available (which may result in the states of other tasks being updated)

*[[Sly 1:GS]] - The game state tracking systemstruct in {{Sly 1}}.