sgtcodfish / ashleycpp

A C++ clone of Ashley, a Java entity framework.

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Programming Languages: Python, Go, C++, RISC-V Assembly

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ashleycpp's Issues

Feature Parity with Java Original

Currently README.md suggests we have parity as of this commit.

We should get up to date, and update the README.

Todo:

• Add EntitySystem::getEngine commit
  | see #9
• Add EntityListener priority commit
• Check what happens when adding the same entity to and engine twice, and define behaviour if neccessary issue
• Check (+ test?) this issue
• Consider splitting Engine class into smaller classes as in ashley PR#196

Implement Optional Instrumentation

Add an optional (toggled by a define) instrumentation system which allows users to track various statistics about the usage of various entities, systems and components.

It's important that this is all entirely optional, to avoid any performance impact in releases.

Examples of stats we could collect:

• System ordering
• Number of fetches within an update (i.e. usage of componentmapper)
• The number of matching entities in an update cycle

Creating ComponentMapper in Global Scope Fails

Results in a confusing math error when accessing Component IDs, since none exist yet.

This is probably unavoidable short of fixing the library to use constexpr Component IDs.

Multithreading systems

It would be nice to have a base class, which called the component processEntities with multiple threads (from a pool). So it can be much faster (hopefully). The original ashley doesn't have this feature, but it would be a nice addition to this one.

See this theoretical post: https://gamedev.stackexchange.com/a/62754

Fix Creating IteratingSystem with nullptr Family

Currently fails confusingly while trying to create the Family hash - should fail sooner.

Remove dependence on exceptions

I.e. should allow compilation with -fno-exceptions at the very least. This is apparently an issue when working with cocos2d-x.

Raised on twitter

Consider using bitset2

https://github.com/ClaasBontus/bitset2/tree/cpp14 is an implementation of <bitset> which makes better use of constexpr, alongside providing other features. There might be a performance benefit to using this.