godot/core/io/resource_loader.h

/*************************************************************************/
/*  resource_loader.h                                                    */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef RESOURCE_LOADER_H
#define RESOURCE_LOADER_H

#include "export_data.h"
#include "resource.h"
/**
	@author Juan Linietsky <reduzio@gmail.com>
*/

class ResourceInteractiveLoader : public Reference {

	OBJ_TYPE(ResourceInteractiveLoader, Reference);

protected:
	static void _bind_methods();

public:
	virtual void set_local_path(const String &p_local_path) = 0;
	virtual Ref<Resource> get_resource() = 0;
	virtual Error poll() = 0;
	virtual int get_stage() const = 0;
	virtual int get_stage_count() const = 0;
	virtual Error wait();

	ResourceInteractiveLoader() {}
};

class ResourceFormatLoader {
public:
	virtual Ref<ResourceInteractiveLoader> load_interactive(const String &p_path, Error *r_error = NULL);
	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = NULL);
	virtual void get_recognized_extensions(List<String> *p_extensions) const = 0;
	virtual void get_recognized_extensions_for_type(const String &p_type, List<String> *p_extensions) const;
	bool recognize(const String &p_extension) const;
	virtual bool handles_type(const String &p_type) const = 0;
	virtual String get_resource_type(const String &p_path) const = 0;
	virtual void get_dependencies(const String &p_path, List<String> *p_dependencies, bool p_add_types = false);
	virtual Error load_import_metadata(const String &p_path, Ref<ResourceImportMetadata> &r_var) const { return ERR_UNAVAILABLE; }
	virtual Error rename_dependencies(const String &p_path, const Map<String, String> &p_map) { return OK; }
	virtual Error get_export_data(const String &p_path, ExportData &r_export_data) { return ERR_UNAVAILABLE; }

	virtual ~ResourceFormatLoader() {}
};

typedef void (*ResourceLoadErrorNotify)(void *p_ud, const String &p_text);
typedef void (*DependencyErrorNotify)(void *p_ud, const String &p_loading, const String &p_which, const String &p_type);

class ResourceLoader {

	enum {
		MAX_LOADERS = 64
	};

	static ResourceFormatLoader *loader[MAX_LOADERS];
	static int loader_count;
	static bool timestamp_on_load;

	static void *err_notify_ud;
	static ResourceLoadErrorNotify err_notify;
	static void *dep_err_notify_ud;
	static DependencyErrorNotify dep_err_notify;
	static bool abort_on_missing_resource;

	static String find_complete_path(const String &p_path, const String &p_type);

public:
	static Ref<ResourceInteractiveLoader> load_interactive(const String &p_path, const String &p_type_hint = "", bool p_no_cache = false, Error *r_error = NULL);
	static RES load(const String &p_path, const String &p_type_hint = "", bool p_no_cache = false, Error *r_error = NULL);
	static Ref<ResourceImportMetadata> load_import_metadata(const String &p_path);

	static void get_recognized_extensions_for_type(const String &p_type, List<String> *p_extensions);
	static void add_resource_format_loader(ResourceFormatLoader *p_format_loader, bool p_at_front = false);
	static String get_resource_type(const String &p_path);
	static void get_dependencies(const String &p_path, List<String> *p_dependencies, bool p_add_types = false);
	static Error rename_dependencies(const String &p_path, const Map<String, String> &p_map);

	static Error get_export_data(const String &p_path, ExportData &r_export_data);

	static String guess_full_filename(const String &p_path, const String &p_type);

	static void set_timestamp_on_load(bool p_timestamp) { timestamp_on_load = p_timestamp; }

	static void notify_load_error(const String &p_err) {
		if (err_notify) err_notify(err_notify_ud, p_err);
	}
	static void set_error_notify_func(void *p_ud, ResourceLoadErrorNotify p_err_notify) {
		err_notify = p_err_notify;
		err_notify_ud = p_ud;
	}

	static void notify_dependency_error(const String &p_path, const String &p_dependency, const String &p_type) {
		if (dep_err_notify) dep_err_notify(dep_err_notify_ud, p_path, p_dependency, p_type);
	}
	static void set_dependency_error_notify_func(void *p_ud, DependencyErrorNotify p_err_notify) {
		dep_err_notify = p_err_notify;
		dep_err_notify_ud = p_ud;
	}

	static void set_abort_on_missing_resources(bool p_abort) { abort_on_missing_resource = p_abort; }
	static bool get_abort_on_missing_resources() { return abort_on_missing_resource; }
};

#endif