winwardo / snapback-game-engine Goto Github PK

For example, in src/core/physicssystem.rs we can see we need to ask the entities for all those with two given flags (C_MASS | C_POSITION). At the moment, this naively runs this:

self.entities.iter().filter(|x| x.has_flags(flags)).collect::<Vec<&Entity>>()

This gets called every time process_physics() does, as well as every other time a non-singular component processor is called, which is a potentially a lot. Instead, Entities (or some other location) should have a specific list called entities_mass_position or similar (maybe a Map<ComponentFlag, Vec<Entity>>) which whenever someone registers to both a Mass and Position component, tracks the id.

process_physics can then ask for all Entitys from this list directly rather than having to prefilter every frame.