export class Scene {

    constructor() {
        this.map = {}
        this.entities = {}
        this.materials = {}
    }

    add(material, entity) {
        var arr = this.map[material.id]
        if (arr == undefined) {
            arr = []
            this.materials[material.id] = material
        }
        if (!arr.includes(entity.id)) {
            arr.push(entity.id)
            this.entities[entity.id] = entity
        }
        this.map[material.id] = arr
    }

    remove(material, entity) {
        var arr = this.objects[material.id]
        if (arr == undefined) {
            return
        }
        const i = arr.indexOf(entity.id)
        if(i > -1) {
            arr = arr.splice(i, 1)
            delete this.entities[entity.id]
            if(arr.length < 1) {
                delete this.map[material.id]
                delete this.materials[material.id]
            }
        }
    }

}