ecs go experiments (egoe)

https://stdiopt.github.io/egoe/

Exploring entity component system pattern in go and a couple other things

• webgl2 instancing
• multitouch

After a couple of tries/benchmarks on different methods I came up with this

Running

Using hajimehoshi wasm serve https://github.com/hajimehoshi/wasmserve

Get the wasmserve app

go get -u github.com/hajimehoshi/wasmserve

Run on repo path

wasmserve ./cmd/egoe-wasm

Strong typed components and entities

System is no more no less than a func that accepts a ecs.Manager and registers handlers for specific types on the manager

Component any struct that will be embed on entities. Component structs usually have methods to return it self so the systems are able to interface and filter

Entity any struct with certain components

Messaging/callbacks

github.com/stdiopt/egoe/ecs

It uses reflection to match specific types and perform the calls, after benchmarking for a while with different scenarios the results weren't much different using a reflection Call, although it performs an allocation while using the reflect.Call internally

m := ecs.New()

m.Watch(func(anystruct){})
m.Handle(func(anystruct){})
m.Query(func(anystruct){})

m.Trigger(anystruct)

Packages

• github.com/stdiopt/egoe/ecs it is the hub where systems interacts with each others, a kind of messaging bus
• github.com/stdiopt/egoe/gl contains code from golang.org/x/mobile/gl mostly the interface and gl constants and a partially implemented webgl wrapper as most of things were implemented on demand
• github.com/stdiopt/egoe/systems/dom system that prepares the HTML page with the canvas and translate the user inputs
• github.com/stdiopt/egoe/systems/input currently it only have event types related to pointer and keyboard
• github.com/stdiopt/egoe/systems/renderer intended to be platform agnostic but it currently have some exceptions for buffer transfer (wasm, js.CopyBytesToJS..) it will render entities with certain specific components world.{Transform,Operation,Material}
• github.com/stdiopt/egoe/world - contains the common data only components and events for the world such as {Transform,Operation,Material}
• github.com/stdiopt/egoe - the domain specific system and entities