Crate specs

SPECS Parallel ECS

This library provides an ECS variant designed for parallel execution and convenient usage. It is highly flexible when it comes to actual component data and the way it is stored and accessed.

Structs

BitSet	A BitSet is a simple set designed to track entity indices for which a certain component exists. It does not track the Generation of the entities that it contains.
BitSetAnd	BitSetAnd takes two BitSetLike items, and merges the masks returning a new virtual set, which represents an intersection of the two original sets.
CreateEntityIter	Entity creation iterator. Will yield new empty entities infinitely. Useful for bulk entity construction, since the locks are only happening once.
DynamicEntityIter	A custom entity iterator for dynamically added entities.
Entity	Entity type, as seen by the user.
EntityBuilder	Helper builder for entities.
EntityIter	A custom entity iterator. Needed because the world doesn't really store entities directly, but rather has just a vector of Index -> Generation.
FetchArg	System fetch-time argument. The fetch is executed at the start of the run. It contains a subset of World methods that make sense during initialization.
Generation	Index generation. When a new entity is placed at an old index, it bumps the Generation by 1. This allows to avoid using components from the entities that were deleted.
HashMapStorage	HashMap-based storage. Best suited for rare components.
Planner	System execution planner. Allows running systems via closures, distributes the load in parallel using a thread pool.
RunArg	System closure run-time argument.
VecStorage	Vec-based storage, stores the generations of the data in order to match with given entities. Supposed to have maximum performance for the components mostly present in entities.
World	The World struct contains all the data, which is entities and their components. All methods are supposed to be valid for any context they are available in.

Traits

BitSetLike	A generic interface for BitSet-like types.
Component	Abstract component type. Doesn't have to be Copy or even Clone.
Storage	Typed component storage trait.
StorageBase	Base trait for a component storage that is used as a trait object. Doesn't depend on the actual component type.
UnprotectedStorage	Used by the framework to quickly join componets

Type Definitions

Index

Index type is arbitrary. It doesn't show up in any interfaces. Keeping it 32bit allows for a single 64bit word per entity.