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    Class Component

    Component is a functional unit that can be added to an Entity instance. This is the base class for all components in the ECS (Entity-Component-System) architecture. Components provide specific functionality and data to entities.

    Hierarchy (View Summary)

    Index

    Constructors

    • The constructor of the Component class. When creating a Component, use the createComponent method of the ComponentRepository class instead of directly calling this constructor.

      Parameters

      • engine: Engine

        The engine instance

      • entityUid: number

        Unique ID of the corresponding entity

      • componentSid: number

        Scoped ID of the Component

      • entityRepository: EntityRepository

        The instance of the EntityRepository class (Dependency Injection)

      • isReUse: boolean

        Whether this component is being reused from a pool

      Returns Component

    Properties

    __currentProcessStage: ProcessStageEnum = ProcessStage.Load
    __engine: Engine
    __entityRepository: EntityRepository

    the instance of EntityRepository

    __entityUid: number

    the entity unique Id which this component belongs to

    __isReUse: boolean = false
    __memoryManager: MemoryManager

    the instance of MemoryManager

    _isAlive: boolean = true
    _tags: RnTags = {}

    Collection of tags associated with this object

    _processStages: ProcessStageEnum[] = ...
    currentMaxObjectCount: number = 0

    Current maximum object count for UID generation

    InvalidObjectUID: -1

    Invalid object UID constant

    Accessors

    • get _componentMemoryRegistry(): ComponentMemoryRegistry

      Gets the ComponentMemoryRegistry for this component's engine.

      Returns ComponentMemoryRegistry

    • get componentSID(): number

      Gets the Scoped ID of this Component instance. The SID is unique within the component type and represents the instance index.

      Returns number

      The component scoped ID

    • get componentTID(): number

      Gets the Type ID of this Component instance. This is overridden by concrete component classes to provide unique type identification.

      Returns number

      The component type ID (default: 0)

    • get entityUID(): number

      Gets the unique ID of the entity that owns this component.

      Returns number

      The entity unique ID

    • get objectUID(): number

      Gets the unique object identifier

      Returns number

      The object's UID

    • get uniqueName(): string

      Gets the unique name of this object

      Returns string

      The unique name string

    • get componentTID(): number

      Gets the Type ID of the Component class. This is overridden by concrete component classes to provide unique type identification.

      Returns number

      The component type ID (default: 0)

    Methods

    • Internal

      Marks this component as destroyed and no longer alive. This is used internally to manage component lifecycle.

      Returns void

    • Performs a shallow copy of data from another component of the same type. This method should be implemented by concrete component classes as needed.

      Parameters

      Returns void

    • Retrieves a complete tag object (name and value) for the specified tag name

      Parameters

      • tagName: string

        The name of the tag to retrieve

      Returns Tag

      A Tag object containing the name and value

    • Retrieves the value associated with a specific tag name

      Parameters

      • tagName: string

        The name of the tag whose value to retrieve

      Returns any

      The tag value, or undefined if the tag doesn't exist

    • Checks whether this object has a tag with the specified name

      Parameters

      • tagName: string

        The name of the tag to check for

      Returns boolean

      True if the tag exists (value is not null/undefined), false otherwise

    • Checks whether the specified ProcessStage method exists in this Component instance. This is used to determine if this component can handle a particular process stage.

      Parameters

      Returns boolean

      True if the method exists, false otherwise

    • Checks if this object has a tag with the specified name and value

      Parameters

      • tagName: string

        The tag name to match

      • tagValue: string

        The tag value to match

      Returns boolean

      True if the object has a matching tag, false otherwise

    • Checks if this object has all the specified tags with exactly matching values

      Parameters

      • tags: RnTags

        Object containing tag names as keys and expected values

      Returns boolean

      True if all specified tags exist with matching values, false otherwise

    • Checks if the object's combined tag string contains all the provided search strings. This allows for flexible searching within tag names and values.

      Parameters

      • stringArray: string[]

        Array of strings that must all be present in the combined tag string

      Returns boolean

      True if all strings are found in the combined tag string, false otherwise

    • Registers a dependency relationship with another component. This method is intended for future use in managing component dependencies.

      Parameters

      Returns void

      This method is not used yet and needs implementation

    • Allocates memory for all member fields of this component instance. This method is called during component initialization to set up memory layout and allocate space for the specified number of entities.

      Parameters

      • componentCountPerBufferView: number

        The number of components per buffer view

      • isReUse: boolean

        Whether to reuse existing memory allocations

      Returns void

    • Attempts to set a tag on this object. If the tag already exists, it will be replaced.

      Parameters

      • tag: Tag

        The tag object containing the name and value to set

      Returns boolean

      True if the tag was successfully set, false if the tag name contains invalid characters

    • Attempts to set a unique name for this object

      Parameters

      • name: string

        The desired unique name

      • toAddNameIfConflict: boolean

        If true, appends UID to make name unique when conflicts occur; if false, fails on conflict

      Returns boolean

      True if the name was successfully set, false if there was a conflict and toAddNameIfConflict was false

    • Validates that a tag string contains only allowed characters (alphanumeric and underscore)

      Parameters

      • val: string

        The string to validate

      Returns boolean

      True if the string contains only valid characters, false if it contains invalid characters

    • Checks whether the specified ProcessStage method exists in the given Component class. This is used to determine if a component can handle a particular process stage.

      Parameters

      Returns boolean

      True if the method exists, false otherwise

    • Gets the array length of a specific member field in a component class.

      Parameters

      Returns Map<typeof Component, Map<string, number>>

      The array length map of the component

    • Gets the ComponentType of a specific member field in a component class. This is useful for understanding the primitive data type of component members.

      Parameters

      • _engine: Engine
      • memberName: string

        The name of the member field

      • componentClass: typeof Component

        The component class to query

      Returns ComponentTypeEnum | undefined

      The ComponentType of the member or undefined if not found

    • Gets the CompositionType of a specific member field in a component class. This is useful for understanding the data structure of component members.

      Parameters

      • _engine: Engine
      • memberName: string

        The name of the member field

      • componentClass: typeof Component

        The component class to query

      Returns CompositionTypeEnum | undefined

      The CompositionType of the member or undefined if not found

    • Gets the pixel location offset in the buffer for a specific member of a component type. This is useful for GPU texture-based data access where locations are measured in pixels.

      Parameters

      • engine: Engine

        The engine instance

      • componentType: typeof Component

        The component class type

      • memberName: string

        The name of the member field

      Returns number[]

      The pixel location offset in the buffer

    • Retrieves an RnObject instance by its unique identifier

      Parameters

      • objectUid: number

        The unique identifier of the object to retrieve

      Returns RnObject | undefined

      The RnObject instance or undefined if not found or garbage collected

    • Gets the state version of the component memory layout. This is incremented whenever the component's memory layout changes.

      Parameters

      • engine: Engine

        The engine instance

      Returns number

      The state version number

    • Processes all components of a given type for a specific process stage. This method iterates through all components of the specified type and calls their corresponding process stage method if they are in that stage.

      Parameters

      Returns void

    • Registers a member field of the component class for memory allocation. This method defines the memory layout and characteristics of component data members.

      Parameters

      • this: typeof Component
      • bufferUse: {
            arrayLength?: number;
            bufferUse: EnumIO;
            componentSID?: number;
            componentType: ComponentTypeEnum;
            compositionType: CompositionTypeEnum;
            convertToBool?: boolean;
            dataClassType: DataClassType;
            initValues: number[] | VectorN;
            memberName: string;
            shaderType: EnumIO;
        }

        The intended purpose/type of buffer use

      Returns void

    • Searches for the first object that has a specific tag with the given value

      Parameters

      • tag: string

        The tag name to search for

      • value: string

        The tag value to match

      Returns WeakRef<RnObject> | undefined

      WeakRef to the first matching object, or undefined if not found

    • Updates components specifically for the render stage with render pass context. This method calls the sort_$render method of the component class to handle render-specific processing and sorting.

      Parameters

      Returns any

      The result of the sort_$render method