Implement get_cache_path() for iOS, and improve it for Android and Windows

platform/android/os_android.cpp

@@ -452,10 +452,13 @@ String OS_Android::get_user_data_dir() const {
 }
 
 String OS_Android::get_cache_path() const {
+	if (cache_dir_cache != String())
+		return cache_dir_cache;
+
 	String cache_dir = godot_io_java->get_cache_dir();
 	if (cache_dir != "") {
-		cache_dir = _remove_symlink(cache_dir);
-		return cache_dir;
+		cache_dir_cache = _remove_symlink(cache_dir);
+		return cache_dir_cache;
 	}
 	return ".";
 }

platform/android/os_android.h

@@ -50,6 +50,7 @@ class OS_Android : public OS_Unix {
 	VisualServer *visual_server;
 
 	mutable String data_dir_cache;
+	mutable String cache_dir_cache;
 
 	AudioDriverOpenSL audio_driver_android;
 

platform/iphone/app_delegate.mm

@@ -44,7 +44,7 @@
 extern int gargc;
 extern char **gargv;
 
-extern int iphone_main(int, char **, String);
+extern int iphone_main(int, char **, String, String);
 extern void iphone_finish();
 
 @implementation AppDelegate
@@ -63,8 +63,11 @@ static ViewController *mainViewController = nil;
 	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
 			NSUserDomainMask, YES);
 	NSString *documentsDirectory = [paths objectAtIndex:0];
+	paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory,
+			NSUserDomainMask, YES);
+	NSString *cacheDirectory = [paths objectAtIndex:0];
 
-	int err = iphone_main(gargc, gargv, String::utf8([documentsDirectory UTF8String]));
+	int err = iphone_main(gargc, gargv, String::utf8([documentsDirectory UTF8String]), String::utf8([cacheDirectory UTF8String]));
 	if (err != 0) {
 		// bail, things did not go very well for us, should probably output a message on screen with our error code...
 		exit(0);

platform/iphone/godot_iphone.mm

@@ -70,7 +70,7 @@ int add_cmdline(int p_argc, char **p_args) {
 	return p_argc;
 }
 
-int iphone_main(int argc, char **argv, String data_dir) {
+int iphone_main(int argc, char **argv, String data_dir, String cache_dir) {
 	size_t len = strlen(argv[0]);
 
 	while (len--) {
@@ -90,7 +90,7 @@ int iphone_main(int argc, char **argv, String data_dir) {
 	char cwd[512];
 	getcwd(cwd, sizeof(cwd));
 	printf("cwd %s\n", cwd);
-	os = new OSIPhone(data_dir);
+	os = new OSIPhone(data_dir, cache_dir);
 
 	char *fargv[64];
 	for (int i = 0; i < argc; i++) {

platform/iphone/os_iphone.h

@@ -81,6 +81,7 @@ private:
 	void set_data_dir(String p_dir);
 
 	String data_dir;
+	String cache_dir;
 
 	InputDefault *input;
 
@@ -93,7 +94,7 @@ private:
 public:
 	static OSIPhone *get_singleton();
 
-	OSIPhone(String p_data_dir);
+	OSIPhone(String p_data_dir, String p_cache_dir);
 	~OSIPhone();
 
 	bool iterate();
@@ -115,6 +116,7 @@ public:
 	Error shell_open(String p_uri);
 
 	String get_user_data_dir() const;
+	String get_cache_path() const;
 
 	String get_locale() const;
 

platform/iphone/os_iphone.mm

@@ -494,6 +494,10 @@ String OSIPhone::get_clipboard() const {
 	return String::utf8([text UTF8String]);
 }
 
+String OSIPhone::get_cache_path() const {
+	return cache_dir;
+}
+
 String OSIPhone::get_model_name() const {
 	String model = ios->get_model();
 	if (model != "") {
@@ -668,7 +672,7 @@ void add_ios_init_callback(init_callback cb) {
 	}
 }
 
-OSIPhone::OSIPhone(String p_data_dir) {
+OSIPhone::OSIPhone(String p_data_dir, String p_cache_dir) {
 	for (int i = 0; i < ios_init_callbacks_count; ++i) {
 		ios_init_callbacks[i]();
 	}
@@ -683,6 +687,7 @@ OSIPhone::OSIPhone(String p_data_dir) {
 	// can't call set_data_dir from here, since it requires DirAccess
 	// which is initialized in initialize_core
 	data_dir = p_data_dir;
+	cache_dir = p_cache_dir;
 
 	Vector<Logger *> loggers;
 	loggers.push_back(memnew(SyslogLogger));

platform/windows/os_windows.cpp

@@ -3378,18 +3378,27 @@ String OS_Windows::get_data_path() const {
 }
 
 String OS_Windows::get_cache_path() const {
-	// The XDG Base Directory specification technically only applies on Linux/*BSD, but it doesn't hurt to support it on Windows as well.
-	if (has_environment("XDG_CACHE_HOME")) {
-		if (get_environment("XDG_CACHE_HOME").is_abs_path()) {
-			return get_environment("XDG_CACHE_HOME").replace("\\", "/");
-		} else {
-			WARN_PRINT_ONCE("`XDG_CACHE_HOME` is a relative path. Ignoring its value and falling back to `%TEMP%` or `get_config_path()` per the XDG Base Directory specification.");
+	static String cache_path_cache;
+	if (cache_path_cache == String()) {
+		// The XDG Base Directory specification technically only applies on Linux/*BSD, but it doesn't hurt to support it on Windows as well.
+		if (has_environment("XDG_CACHE_HOME")) {
+			if (get_environment("XDG_CACHE_HOME").is_abs_path()) {
+				cache_path_cache = get_environment("XDG_CACHE_HOME").replace("\\", "/");
+			} else {
+				WARN_PRINT_ONCE("`XDG_CACHE_HOME` is a relative path. Ignoring its value and falling back to `%LOCALAPPDATA%\\cache`, `%TEMP%` or `get_config_path()` per the XDG Base Directory specification.");
+			}
+		}
+		if (cache_path_cache == String() && has_environment("LOCALAPPDATA")) {
+			cache_path_cache = get_environment("LOCALAPPDATA").replace("\\", "/");
+		}
+		if (cache_path_cache == String() && has_environment("TEMP")) {
+			cache_path_cache = get_environment("TEMP").replace("\\", "/");
+		}
+		if (cache_path_cache == String()) {
+			cache_path_cache = get_config_path();
 		}
 	}
-	if (has_environment("TEMP")) {
-		return get_environment("TEMP").replace("\\", "/");
-	}
-	return get_config_path();
+	return cache_path_cache;
 }
 
 // Get properly capitalized engine name for system paths