ResourceFormatLoader

Inherits: Reference < Object

Loads a specific resource type from a file.

Description

Redot loads resources in the editor or in exported games using ResourceFormatLoaders. They are queried automatically via the ResourceLoader singleton, or when a resource with internal dependencies is loaded. Each file type may load as a different resource type, so multiple ResourceFormatLoaders are registered in the engine.

Extending this class allows you to define your own loader. Be sure to respect the documented return types and values. You should give it a global class name with class_name for it to be registered. Like built-in ResourceFormatLoaders, it will be called automatically when loading resources of its handled type(s). You may also implement a ResourceFormatSaver.

Note: You can also extend EditorImportPlugin if the resource type you need exists but Redot is unable to load its format. Choosing one way over another depends on if the format is suitable or not for the final exported game. For example, it's better to import .png textures as .stex (StreamTexture) first, so they can be loaded with better efficiency on the graphics card.

Methods

void

get_dependencies ( String path, String add_types ) virtual

PoolStringArray

get_recognized_extensions ( ) virtual

String

get_resource_type ( String path ) virtual

bool

handles_type ( String typename ) virtual

Variant

load ( String path, String original_path, bool no_subresource_cache ) virtual

int

rename_dependencies ( String path, String renames ) virtual

Method Descriptions

void get_dependencies ( String path, String add_types ) virtual

If implemented, gets the dependencies of a given resource. If add_types is true, paths should be appended ::TypeName, where TypeName is the class name of the dependency.

Note: Custom resource types defined by scripts aren't known by the ClassDB, so you might just return "Resource" for them.

PoolStringArray get_recognized_extensions ( ) virtual

Gets the list of extensions for files this loader is able to read.

String get_resource_type ( String path ) virtual

Gets the class name of the resource associated with the given path. If the loader cannot handle it, it should return "".

Note: Custom resource types defined by scripts aren't known by the ClassDB, so you might just return "Resource" for them.

bool handles_type ( String typename ) virtual

Tells which resource class this loader can load.

Note: Custom resource types defined by scripts aren't known by the ClassDB, so you might just handle "Resource" for them.

Variant load ( String path, String original_path, bool no_subresource_cache ) virtual

Loads a resource when the engine finds this loader to be compatible. If the loaded resource is the result of an import, original_path will target the source file. If no_subresource_cache is true, sub-resources should not be cached. Returns a Resource object on success, or an Error constant in case of failure.

int rename_dependencies ( String path, String renames ) virtual

If implemented, renames dependencies within the given resource and saves it. renames is a dictionary { String => String } mapping old dependency paths to new paths.

Returns @GlobalScope.OK on success, or an Error constant in case of failure.