Method Add

common/render.go:261–303

Add adds an entity to the RenderSystem. The entity needs a basic, render, and space component to be added to the system.

(basic *ecs.BasicEntity, render *RenderComponent, space *SpaceComponent)

// Add adds an entity to the RenderSystem. The entity needs a basic, render, and space component to be added to the system.
func (rs *RenderSystem) Add(basic *ecs.BasicEntity, render *RenderComponent, space *SpaceComponent) {
	// Do nothing if entity already exists
	if _, ok := rs.ids[basic.ID()]; ok {
		return
	}

	rs.ids[basic.ID()] = struct{}{}

	render.ensureShader()

	// This is to prevent users from using the wrong one
	if render.shader == HUDShader {
		switch render.Drawable.(type) {
		case Triangle:
			render.shader = LegacyHUDShader
		case Circle:
			render.shader = LegacyHUDShader
		case Rectangle:
			render.shader = LegacyHUDShader
		case ComplexTriangles:
			render.shader = LegacyHUDShader
		case Text:
			render.shader = TextHUDShader
		default:
			render.shader = HUDShader
		}
	}

	// If the scale is zero, set it to one.
	if render.Scale.X == 0 {
		render.Scale.X = 1
	}
	if render.Scale.Y == 0 {
		render.Scale.Y = 1
	}

	if render.zIndex == 0 {
		render.zIndex = render.StartZIndex
	}

	rs.entities = append(rs.entities, renderEntity{basic, render, space})
	rs.sortingNeeded = true
}

// EntityExists looks if the entity is already into the System's entities. It will return the index >= 0 of the object into de rs.entities or -1 if it could not be found.
func (rs *RenderSystem) EntityExists(basic *ecs.BasicEntity) int {