Added function ResourceLoader.exists(), to check if a resource exists. Closes #19140

core/bind/core_bind.cpp

@@ -112,11 +112,15 @@ PoolStringArray _ResourceLoader::get_dependencies(const String &p_path) {
 	return ret;
 };
 
-bool _ResourceLoader::has(const String &p_path) {
+bool _ResourceLoader::has_cached(const String &p_path) {
 
 	String local_path = ProjectSettings::get_singleton()->localize_path(p_path);
 	return ResourceCache::has(local_path);
-};
+}
+
+bool _ResourceLoader::exists(const String &p_path, const String &p_type_hint) {
+	return ResourceLoader::exists(p_path, p_type_hint);
+}
 
 void _ResourceLoader::_bind_methods() {
 
@@ -125,7 +129,8 @@ void _ResourceLoader::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_recognized_extensions_for_type", "type"), &_ResourceLoader::get_recognized_extensions_for_type);
 	ClassDB::bind_method(D_METHOD("set_abort_on_missing_resources", "abort"), &_ResourceLoader::set_abort_on_missing_resources);
 	ClassDB::bind_method(D_METHOD("get_dependencies", "path"), &_ResourceLoader::get_dependencies);
-	ClassDB::bind_method(D_METHOD("has", "path"), &_ResourceLoader::has);
+	ClassDB::bind_method(D_METHOD("has_cached", "path"), &_ResourceLoader::has_cached);
+	ClassDB::bind_method(D_METHOD("exists", "path", "type_hint"), &_ResourceLoader::exists, DEFVAL(""));
 }
 
 _ResourceLoader::_ResourceLoader() {

core/bind/core_bind.h

@@ -55,7 +55,8 @@ public:
 	PoolVector<String> get_recognized_extensions_for_type(const String &p_type);
 	void set_abort_on_missing_resources(bool p_abort);
 	PoolStringArray get_dependencies(const String &p_path);
-	bool has(const String &p_path);
+	bool has_cached(const String &p_path);
+	bool exists(const String &p_path, const String &p_type_hint = "");
 
 	_ResourceLoader();
 };

core/io/resource_loader.cpp

@@ -123,6 +123,9 @@ Ref<ResourceInteractiveLoader> ResourceFormatLoader::load_interactive(const Stri
 	return ril;
 }
 
+bool ResourceFormatLoader::exists(const String &p_path) const {
+	return FileAccess::exists(p_path); //by default just check file
+}
 RES ResourceFormatLoader::load(const String &p_path, const String &p_original_path, Error *r_error) {
 
 	String path = p_path;
@@ -239,6 +242,36 @@ RES ResourceLoader::load(const String &p_path, const String &p_type_hint, bool p
 	return res;
 }
 
+bool ResourceLoader::exists(const String &p_path, const String &p_type_hint) {
+
+	String local_path;
+	if (p_path.is_rel_path())
+		local_path = "res://" + p_path;
+	else
+		local_path = ProjectSettings::get_singleton()->localize_path(p_path);
+
+	if (ResourceCache::has(local_path)) {
+
+		return false; //if cached, it probably exists i guess
+	}
+
+	bool xl_remapped = false;
+	String path = _path_remap(local_path, &xl_remapped);
+
+	// Try all loaders and pick the first match for the type hint
+	for (int i = 0; i < loader_count; i++) {
+
+		if (!loader[i]->recognize_path(path, p_type_hint)) {
+			continue;
+		}
+
+		if (loader[i]->exists(path))
+			return true;
+	}
+
+	return false;
+}
+
 Ref<ResourceInteractiveLoader> ResourceLoader::load_interactive(const String &p_path, const String &p_type_hint, bool p_no_cache, Error *r_error) {
 
 	if (r_error)

core/io/resource_loader.h

@@ -60,6 +60,7 @@ class ResourceFormatLoader {
 public:
 	virtual Ref<ResourceInteractiveLoader> load_interactive(const String &p_path, const String &p_original_path = "", Error *r_error = NULL);
 	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = NULL);
+	virtual bool exists(const String &p_path) const;
 	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;
 	virtual bool recognize_path(const String &p_path, const String &p_for_type = String()) const;
@@ -106,6 +107,7 @@ class ResourceLoader {
 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 bool exists(const String &p_path, const String &p_type_hint = "");
 
 	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);