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resource_loader.cpp
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resource_loader.cpp
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/**************************************************************************/
/* resource_loader.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "resource_loader.h"
#include "core/config/project_settings.h"
#include "core/io/file_access.h"
#include "core/io/resource_importer.h"
#include "core/object/script_language.h"
#include "core/os/condition_variable.h"
#include "core/os/os.h"
#include "core/os/safe_binary_mutex.h"
#include "core/string/print_string.h"
#include "core/string/translation.h"
#include "core/variant/variant_parser.h"
#include "servers/rendering_server.h"
#ifdef DEBUG_LOAD_THREADED
#define print_lt(m_text) print_line(m_text)
#else
#define print_lt(m_text)
#endif
Ref<ResourceFormatLoader> ResourceLoader::loader[ResourceLoader::MAX_LOADERS];
int ResourceLoader::loader_count = 0;
bool ResourceFormatLoader::recognize_path(const String &p_path, const String &p_for_type) const {
bool ret = false;
if (GDVIRTUAL_CALL(_recognize_path, p_path, p_for_type, ret)) {
return ret;
}
String extension = p_path.get_extension();
List<String> extensions;
if (p_for_type.is_empty()) {
get_recognized_extensions(&extensions);
} else {
get_recognized_extensions_for_type(p_for_type, &extensions);
}
for (const String &E : extensions) {
if (E.nocasecmp_to(extension) == 0) {
return true;
}
}
return false;
}
bool ResourceFormatLoader::handles_type(const String &p_type) const {
bool success = false;
GDVIRTUAL_CALL(_handles_type, p_type, success);
return success;
}
void ResourceFormatLoader::get_classes_used(const String &p_path, HashSet<StringName> *r_classes) {
Vector<String> ret;
if (GDVIRTUAL_CALL(_get_classes_used, p_path, ret)) {
for (int i = 0; i < ret.size(); i++) {
r_classes->insert(ret[i]);
}
return;
}
String res = get_resource_type(p_path);
if (!res.is_empty()) {
r_classes->insert(res);
}
}
String ResourceFormatLoader::get_resource_type(const String &p_path) const {
String ret;
GDVIRTUAL_CALL(_get_resource_type, p_path, ret);
return ret;
}
String ResourceFormatLoader::get_resource_script_class(const String &p_path) const {
String ret;
GDVIRTUAL_CALL(_get_resource_script_class, p_path, ret);
return ret;
}
ResourceUID::ID ResourceFormatLoader::get_resource_uid(const String &p_path) const {
int64_t uid = ResourceUID::INVALID_ID;
GDVIRTUAL_CALL(_get_resource_uid, p_path, uid);
return uid;
}
void ResourceFormatLoader::get_recognized_extensions_for_type(const String &p_type, List<String> *p_extensions) const {
if (p_type.is_empty() || handles_type(p_type)) {
get_recognized_extensions(p_extensions);
}
}
void ResourceLoader::get_recognized_extensions_for_type(const String &p_type, List<String> *p_extensions) {
for (int i = 0; i < loader_count; i++) {
loader[i]->get_recognized_extensions_for_type(p_type, p_extensions);
}
}
bool ResourceFormatLoader::exists(const String &p_path) const {
bool success = false;
if (GDVIRTUAL_CALL(_exists, p_path, success)) {
return success;
}
return FileAccess::exists(p_path); // By default just check file.
}
void ResourceFormatLoader::get_recognized_extensions(List<String> *p_extensions) const {
PackedStringArray exts;
if (GDVIRTUAL_CALL(_get_recognized_extensions, exts)) {
const String *r = exts.ptr();
for (int i = 0; i < exts.size(); ++i) {
p_extensions->push_back(r[i]);
}
}
}
Ref<Resource> ResourceFormatLoader::load(const String &p_path, const String &p_original_path, Error *r_error, bool p_use_sub_threads, float *r_progress, CacheMode p_cache_mode) {
Variant res;
if (GDVIRTUAL_CALL(_load, p_path, p_original_path, p_use_sub_threads, p_cache_mode, res)) {
if (res.get_type() == Variant::INT) { // Error code, abort.
if (r_error) {
*r_error = (Error)res.operator int64_t();
}
return Ref<Resource>();
} else { // Success, pass on result.
if (r_error) {
*r_error = OK;
}
return res;
}
}
ERR_FAIL_V_MSG(Ref<Resource>(), "Failed to load resource '" + p_path + "'. ResourceFormatLoader::load was not implemented for this resource type.");
}
void ResourceFormatLoader::get_dependencies(const String &p_path, List<String> *p_dependencies, bool p_add_types) {
PackedStringArray deps;
if (GDVIRTUAL_CALL(_get_dependencies, p_path, p_add_types, deps)) {
const String *r = deps.ptr();
for (int i = 0; i < deps.size(); ++i) {
p_dependencies->push_back(r[i]);
}
}
}
Error ResourceFormatLoader::rename_dependencies(const String &p_path, const HashMap<String, String> &p_map) {
Dictionary deps_dict;
for (KeyValue<String, String> E : p_map) {
deps_dict[E.key] = E.value;
}
Error err = OK;
GDVIRTUAL_CALL(_rename_dependencies, p_path, deps_dict, err);
return err;
}
void ResourceFormatLoader::_bind_methods() {
BIND_ENUM_CONSTANT(CACHE_MODE_IGNORE);
BIND_ENUM_CONSTANT(CACHE_MODE_REUSE);
BIND_ENUM_CONSTANT(CACHE_MODE_REPLACE);
BIND_ENUM_CONSTANT(CACHE_MODE_IGNORE_DEEP);
BIND_ENUM_CONSTANT(CACHE_MODE_REPLACE_DEEP);
GDVIRTUAL_BIND(_get_recognized_extensions);
GDVIRTUAL_BIND(_recognize_path, "path", "type");
GDVIRTUAL_BIND(_handles_type, "type");
GDVIRTUAL_BIND(_get_resource_type, "path");
GDVIRTUAL_BIND(_get_resource_script_class, "path");
GDVIRTUAL_BIND(_get_resource_uid, "path");
GDVIRTUAL_BIND(_get_dependencies, "path", "add_types");
GDVIRTUAL_BIND(_rename_dependencies, "path", "renames");
GDVIRTUAL_BIND(_exists, "path");
GDVIRTUAL_BIND(_get_classes_used, "path");
GDVIRTUAL_BIND(_load, "path", "original_path", "use_sub_threads", "cache_mode");
}
///////////////////////////////////
// This should be robust enough to be called redundantly without issues.
void ResourceLoader::LoadToken::clear() {
thread_load_mutex.lock();
WorkerThreadPool::TaskID task_to_await = 0;
if (!local_path.is_empty()) { // Empty is used for the special case where the load task is not registered.
DEV_ASSERT(thread_load_tasks.has(local_path));
ThreadLoadTask &load_task = thread_load_tasks[local_path];
if (!load_task.awaited) {
task_to_await = load_task.task_id;
load_task.awaited = true;
}
thread_load_tasks.erase(local_path);
local_path.clear();
}
if (!user_path.is_empty()) {
DEV_ASSERT(user_load_tokens.has(user_path));
user_load_tokens.erase(user_path);
user_path.clear();
}
thread_load_mutex.unlock();
// If task is unused, await it here, locally, now the token data is consistent.
if (task_to_await) {
WorkerThreadPool::get_singleton()->wait_for_task_completion(task_to_await);
}
}
ResourceLoader::LoadToken::~LoadToken() {
clear();
}
Ref<Resource> ResourceLoader::_load(const String &p_path, const String &p_original_path, const String &p_type_hint, ResourceFormatLoader::CacheMode p_cache_mode, Error *r_error, bool p_use_sub_threads, float *r_progress) {
const String &original_path = p_original_path.is_empty() ? p_path : p_original_path;
load_nesting++;
if (load_paths_stack->size()) {
thread_load_mutex.lock();
const String &parent_task_path = load_paths_stack->get(load_paths_stack->size() - 1);
HashMap<String, ThreadLoadTask>::Iterator E = thread_load_tasks.find(parent_task_path);
// Avoid double-tracking, for progress reporting, resources that boil down to a remapped path containing the real payload (e.g., imported resources).
bool is_remapped_load = original_path == parent_task_path;
if (E && !is_remapped_load) {
E->value.sub_tasks.insert(p_original_path);
}
thread_load_mutex.unlock();
}
load_paths_stack->push_back(original_path);
// Try all loaders and pick the first match for the type hint
bool found = false;
Ref<Resource> res;
for (int i = 0; i < loader_count; i++) {
if (!loader[i]->recognize_path(p_path, p_type_hint)) {
continue;
}
found = true;
res = loader[i]->load(p_path, original_path, r_error, p_use_sub_threads, r_progress, p_cache_mode);
if (!res.is_null()) {
break;
}
}
load_paths_stack->resize(load_paths_stack->size() - 1);
res_ref_overrides.erase(load_nesting);
load_nesting--;
if (!res.is_null()) {
return res;
}
ERR_FAIL_COND_V_MSG(found, Ref<Resource>(),
vformat("Failed loading resource: %s. Make sure resources have been imported by opening the project in the editor at least once.", p_path));
#ifdef TOOLS_ENABLED
Ref<FileAccess> file_check = FileAccess::create(FileAccess::ACCESS_RESOURCES);
ERR_FAIL_COND_V_MSG(!file_check->file_exists(p_path), Ref<Resource>(), vformat("Resource file not found: %s (expected type: %s)", p_path, p_type_hint));
#endif
ERR_FAIL_V_MSG(Ref<Resource>(), vformat("No loader found for resource: %s (expected type: %s)", p_path, p_type_hint));
}
void ResourceLoader::_thread_load_function(void *p_userdata) {
ThreadLoadTask &load_task = *(ThreadLoadTask *)p_userdata;
thread_load_mutex.lock();
caller_task_id = load_task.task_id;
if (cleaning_tasks) {
load_task.status = THREAD_LOAD_FAILED;
thread_load_mutex.unlock();
return;
}
thread_load_mutex.unlock();
// Thread-safe either if it's the current thread or a brand new one.
CallQueue *own_mq_override = nullptr;
if (load_nesting == 0) {
load_paths_stack = memnew(Vector<String>);
if (!Thread::is_main_thread()) {
// Let the caller thread use its own, for added flexibility. Provide one otherwise.
if (MessageQueue::get_singleton() == MessageQueue::get_main_singleton()) {
own_mq_override = memnew(CallQueue);
MessageQueue::set_thread_singleton_override(own_mq_override);
}
set_current_thread_safe_for_nodes(true);
}
}
// --
Error load_err = OK;
Ref<Resource> res = _load(load_task.remapped_path, load_task.remapped_path != load_task.local_path ? load_task.local_path : String(), load_task.type_hint, load_task.cache_mode, &load_err, load_task.use_sub_threads, &load_task.progress);
if (MessageQueue::get_singleton() != MessageQueue::get_main_singleton()) {
MessageQueue::get_singleton()->flush();
}
thread_load_mutex.lock();
load_task.resource = res;
load_task.progress = 1.0; // It was fully loaded at this point, so force progress to 1.0.
load_task.error = load_err;
if (load_task.error != OK) {
load_task.status = THREAD_LOAD_FAILED;
} else {
load_task.status = THREAD_LOAD_LOADED;
}
if (load_task.cond_var) {
load_task.cond_var->notify_all();
memdelete(load_task.cond_var);
load_task.cond_var = nullptr;
}
bool ignoring = load_task.cache_mode == ResourceFormatLoader::CACHE_MODE_IGNORE || load_task.cache_mode == ResourceFormatLoader::CACHE_MODE_IGNORE_DEEP;
bool replacing = load_task.cache_mode == ResourceFormatLoader::CACHE_MODE_REPLACE || load_task.cache_mode == ResourceFormatLoader::CACHE_MODE_REPLACE_DEEP;
bool unlock_pending = true;
if (load_task.resource.is_valid()) {
// From now on, no critical section needed as no one will write to the task anymore.
// Moreover, the mutex being unlocked is a requirement if some of the calls below
// that set the resource up invoke code that in turn requests resource loading.
thread_load_mutex.unlock();
unlock_pending = false;
if (!ignoring) {
if (replacing) {
Ref<Resource> old_res = ResourceCache::get_ref(load_task.local_path);
if (old_res.is_valid() && old_res != load_task.resource) {
// If resource is already loaded, only replace its data, to avoid existing invalidating instances.
old_res->copy_from(load_task.resource);
load_task.resource = old_res;
}
}
load_task.resource->set_path(load_task.local_path, replacing);
} else {
load_task.resource->set_path_cache(load_task.local_path);
}
if (load_task.xl_remapped) {
load_task.resource->set_as_translation_remapped(true);
}
#ifdef TOOLS_ENABLED
load_task.resource->set_edited(false);
if (timestamp_on_load) {
uint64_t mt = FileAccess::get_modified_time(load_task.remapped_path);
//printf("mt %s: %lli\n",remapped_path.utf8().get_data(),mt);
load_task.resource->set_last_modified_time(mt);
}
#endif
if (_loaded_callback) {
_loaded_callback(load_task.resource, load_task.local_path);
}
} else if (!ignoring) {
Ref<Resource> existing = ResourceCache::get_ref(load_task.local_path);
if (existing.is_valid()) {
load_task.resource = existing;
load_task.status = THREAD_LOAD_LOADED;
load_task.progress = 1.0;
thread_load_mutex.unlock();
unlock_pending = false;
if (_loaded_callback) {
_loaded_callback(load_task.resource, load_task.local_path);
}
}
}
if (unlock_pending) {
thread_load_mutex.unlock();
}
if (load_nesting == 0) {
if (own_mq_override) {
MessageQueue::set_thread_singleton_override(nullptr);
memdelete(own_mq_override);
}
if (load_paths_stack) {
memdelete(load_paths_stack);
load_paths_stack = nullptr;
}
}
}
static String _validate_local_path(const String &p_path) {
ResourceUID::ID uid = ResourceUID::get_singleton()->text_to_id(p_path);
if (uid != ResourceUID::INVALID_ID) {
return ResourceUID::get_singleton()->get_id_path(uid);
} else if (p_path.is_relative_path()) {
return ("res://" + p_path).simplify_path();
} else {
return ProjectSettings::get_singleton()->localize_path(p_path);
}
}
Error ResourceLoader::load_threaded_request(const String &p_path, const String &p_type_hint, bool p_use_sub_threads, ResourceFormatLoader::CacheMode p_cache_mode) {
thread_load_mutex.lock();
if (user_load_tokens.has(p_path)) {
print_verbose("load_threaded_request(): Another threaded load for resource path '" + p_path + "' has been initiated. Not an error.");
user_load_tokens[p_path]->reference(); // Additional request.
thread_load_mutex.unlock();
return OK;
}
user_load_tokens[p_path] = nullptr;
thread_load_mutex.unlock();
Ref<ResourceLoader::LoadToken> token = _load_start(p_path, p_type_hint, p_use_sub_threads ? LOAD_THREAD_DISTRIBUTE : LOAD_THREAD_SPAWN_SINGLE, p_cache_mode);
if (token.is_valid()) {
thread_load_mutex.lock();
token->user_path = p_path;
token->reference(); // First request.
user_load_tokens[p_path] = token.ptr();
print_lt("REQUEST: user load tokens: " + itos(user_load_tokens.size()));
thread_load_mutex.unlock();
return OK;
} else {
return FAILED;
}
}
Ref<Resource> ResourceLoader::load(const String &p_path, const String &p_type_hint, ResourceFormatLoader::CacheMode p_cache_mode, Error *r_error) {
if (r_error) {
*r_error = OK;
}
Ref<LoadToken> load_token = _load_start(p_path, p_type_hint, LOAD_THREAD_FROM_CURRENT, p_cache_mode);
if (!load_token.is_valid()) {
if (r_error) {
*r_error = FAILED;
}
return Ref<Resource>();
}
Ref<Resource> res = _load_complete(*load_token.ptr(), r_error);
return res;
}
Ref<ResourceLoader::LoadToken> ResourceLoader::_load_start(const String &p_path, const String &p_type_hint, LoadThreadMode p_thread_mode, ResourceFormatLoader::CacheMode p_cache_mode) {
String local_path = _validate_local_path(p_path);
bool ignoring_cache = p_cache_mode == ResourceFormatLoader::CACHE_MODE_IGNORE || p_cache_mode == ResourceFormatLoader::CACHE_MODE_IGNORE_DEEP;
Ref<LoadToken> load_token;
ThreadLoadTask unregistered_load_task; // Once set, must be valid up to the call to do the load.
ThreadLoadTask *load_task_ptr = nullptr;
bool run_on_current_thread = false;
{
MutexLock thread_load_lock(thread_load_mutex);
if (!ignoring_cache && thread_load_tasks.has(local_path)) {
load_token = Ref<LoadToken>(thread_load_tasks[local_path].load_token);
if (load_token.is_valid()) {
return load_token;
} else {
// The token is dying (reached 0 on another thread).
// Ensure it's killed now so the path can be safely reused right away.
thread_load_tasks[local_path].load_token->clear();
}
}
load_token.instantiate();
load_token->local_path = local_path;
//create load task
{
ThreadLoadTask load_task;
load_task.remapped_path = _path_remap(local_path, &load_task.xl_remapped);
load_task.load_token = load_token.ptr();
load_task.local_path = local_path;
load_task.type_hint = p_type_hint;
load_task.cache_mode = p_cache_mode;
load_task.use_sub_threads = p_thread_mode == LOAD_THREAD_DISTRIBUTE;
if (p_cache_mode == ResourceFormatLoader::CACHE_MODE_REUSE) {
Ref<Resource> existing = ResourceCache::get_ref(local_path);
if (existing.is_valid()) {
//referencing is fine
load_task.resource = existing;
load_task.status = THREAD_LOAD_LOADED;
load_task.progress = 1.0;
thread_load_tasks[local_path] = load_task;
return load_token;
}
}
// Cache-ignoring tasks aren't registered in the map and so must finish within scope.
if (ignoring_cache) {
load_token->local_path.clear();
unregistered_load_task = load_task;
load_task_ptr = &unregistered_load_task;
} else {
DEV_ASSERT(!thread_load_tasks.has(local_path));
HashMap<String, ResourceLoader::ThreadLoadTask>::Iterator E = thread_load_tasks.insert(local_path, load_task);
load_task_ptr = &E->value;
}
}
run_on_current_thread = ignoring_cache || p_thread_mode == LOAD_THREAD_FROM_CURRENT;
if (run_on_current_thread) {
load_task_ptr->thread_id = Thread::get_caller_id();
} else {
load_task_ptr->task_id = WorkerThreadPool::get_singleton()->add_native_task(&ResourceLoader::_thread_load_function, load_task_ptr);
}
}
if (run_on_current_thread) {
_thread_load_function(load_task_ptr);
if (ignoring_cache) {
load_token->res_if_unregistered = load_task_ptr->resource;
}
}
return load_token;
}
float ResourceLoader::_dependency_get_progress(const String &p_path) {
if (thread_load_tasks.has(p_path)) {
ThreadLoadTask &load_task = thread_load_tasks[p_path];
float current_progress = 0.0;
int dep_count = load_task.sub_tasks.size();
if (dep_count > 0) {
for (const String &E : load_task.sub_tasks) {
current_progress += _dependency_get_progress(E);
}
current_progress /= float(dep_count);
current_progress *= 0.5;
current_progress += load_task.progress * 0.5;
} else {
current_progress = load_task.progress;
}
load_task.max_reported_progress = MAX(load_task.max_reported_progress, current_progress);
return load_task.max_reported_progress;
} else {
return 1.0; //assume finished loading it so it no longer exists
}
}
ResourceLoader::ThreadLoadStatus ResourceLoader::load_threaded_get_status(const String &p_path, float *r_progress) {
bool ensure_progress = false;
ThreadLoadStatus status = THREAD_LOAD_IN_PROGRESS;
{
MutexLock thread_load_lock(thread_load_mutex);
if (!user_load_tokens.has(p_path)) {
print_verbose("load_threaded_get_status(): No threaded load for resource path '" + p_path + "' has been initiated or its result has already been collected.");
return THREAD_LOAD_INVALID_RESOURCE;
}
String local_path = _validate_local_path(p_path);
if (!thread_load_tasks.has(local_path)) {
#ifdef DEV_ENABLED
CRASH_NOW();
#endif
// On non-dev, be defensive and at least avoid crashing (at this point at least).
return THREAD_LOAD_INVALID_RESOURCE;
}
ThreadLoadTask &load_task = thread_load_tasks[local_path];
status = load_task.status;
if (r_progress) {
*r_progress = _dependency_get_progress(local_path);
}
// Support userland polling in a loop on the main thread.
if (Thread::is_main_thread() && status == THREAD_LOAD_IN_PROGRESS) {
uint64_t frame = Engine::get_singleton()->get_process_frames();
if (frame == load_task.last_progress_check_main_thread_frame) {
ensure_progress = true;
} else {
load_task.last_progress_check_main_thread_frame = frame;
}
}
}
if (ensure_progress) {
_ensure_load_progress();
}
return status;
}
Ref<Resource> ResourceLoader::load_threaded_get(const String &p_path, Error *r_error) {
if (r_error) {
*r_error = OK;
}
Ref<Resource> res;
{
MutexLock thread_load_lock(thread_load_mutex);
if (!user_load_tokens.has(p_path)) {
print_verbose("load_threaded_get(): No threaded load for resource path '" + p_path + "' has been initiated or its result has already been collected.");
if (r_error) {
*r_error = ERR_INVALID_PARAMETER;
}
return Ref<Resource>();
}
LoadToken *load_token = user_load_tokens[p_path];
if (!load_token) {
// This happens if requested from one thread and rapidly querying from another.
if (r_error) {
*r_error = ERR_BUSY;
}
return Ref<Resource>();
}
// Support userland requesting on the main thread before the load is reported to be complete.
if (Thread::is_main_thread() && !load_token->local_path.is_empty()) {
const ThreadLoadTask &load_task = thread_load_tasks[load_token->local_path];
while (load_task.status == THREAD_LOAD_IN_PROGRESS) {
thread_load_lock.~MutexLock();
bool exit = !_ensure_load_progress();
OS::get_singleton()->delay_usec(1000);
new (&thread_load_lock) MutexLock(thread_load_mutex);
if (exit) {
break;
}
}
}
res = _load_complete_inner(*load_token, r_error, thread_load_lock);
if (load_token->unreference()) {
memdelete(load_token);
}
}
print_lt("GET: user load tokens: " + itos(user_load_tokens.size()));
return res;
}
Ref<Resource> ResourceLoader::_load_complete(LoadToken &p_load_token, Error *r_error) {
MutexLock thread_load_lock(thread_load_mutex);
return _load_complete_inner(p_load_token, r_error, thread_load_lock);
}
Ref<Resource> ResourceLoader::_load_complete_inner(LoadToken &p_load_token, Error *r_error, MutexLock<SafeBinaryMutex<BINARY_MUTEX_TAG>> &p_thread_load_lock) {
if (r_error) {
*r_error = OK;
}
if (!p_load_token.local_path.is_empty()) {
if (!thread_load_tasks.has(p_load_token.local_path)) {
#ifdef DEV_ENABLED
CRASH_NOW();
#endif
// On non-dev, be defensive and at least avoid crashing (at this point at least).
if (r_error) {
*r_error = ERR_BUG;
}
return Ref<Resource>();
}
ThreadLoadTask &load_task = thread_load_tasks[p_load_token.local_path];
if (load_task.status == THREAD_LOAD_IN_PROGRESS) {
DEV_ASSERT((load_task.task_id == 0) != (load_task.thread_id == 0));
if ((load_task.task_id != 0 && load_task.task_id == caller_task_id) ||
(load_task.thread_id != 0 && load_task.thread_id == Thread::get_caller_id())) {
// Load is in progress, but it's precisely this thread the one in charge.
// That means this is a cyclic load.
if (r_error) {
*r_error = ERR_BUSY;
}
return Ref<Resource>();
}
bool loader_is_wtp = load_task.task_id != 0;
Error wtp_task_err = FAILED;
if (loader_is_wtp) {
// Loading thread is in the worker pool.
load_task.awaited = true;
thread_load_mutex.unlock();
wtp_task_err = WorkerThreadPool::get_singleton()->wait_for_task_completion(load_task.task_id);
}
if (load_task.status == THREAD_LOAD_IN_PROGRESS) { // If early errored, awaiting would deadlock.
if (loader_is_wtp) {
if (wtp_task_err == ERR_BUSY) {
// The WorkerThreadPool has reported that the current task wants to await on an older one.
// That't not allowed for safety, to avoid deadlocks. Fortunately, though, in the context of
// resource loading that means that the task to wait for can be restarted here to break the
// cycle, with as much recursion into this process as needed.
// When the stack is eventually unrolled, the original load will have been notified to go on.
// CACHE_MODE_IGNORE is needed because, otherwise, the new request would just see there's
// an ongoing load for that resource and wait for it again. This value forces a new load.
Ref<ResourceLoader::LoadToken> token = _load_start(load_task.local_path, load_task.type_hint, LOAD_THREAD_DISTRIBUTE, ResourceFormatLoader::CACHE_MODE_IGNORE);
Ref<Resource> resource = _load_complete(*token.ptr(), &wtp_task_err);
if (r_error) {
*r_error = wtp_task_err;
}
thread_load_mutex.lock();
return resource;
} else {
DEV_ASSERT(wtp_task_err == OK);
thread_load_mutex.lock();
}
} else {
// Loading thread is main or user thread.
if (!load_task.cond_var) {
load_task.cond_var = memnew(ConditionVariable);
}
do {
load_task.cond_var->wait(p_thread_load_lock);
DEV_ASSERT(thread_load_tasks.has(p_load_token.local_path) && p_load_token.get_reference_count());
} while (load_task.cond_var);
}
} else {
if (loader_is_wtp) {
thread_load_mutex.lock();
}
}
}
if (cleaning_tasks) {
load_task.resource = Ref<Resource>();
load_task.error = FAILED;
}
Ref<Resource> resource = load_task.resource;
if (r_error) {
*r_error = load_task.error;
}
return resource;
} else {
// Special case of an unregistered task.
// The resource should have been loaded by now.
Ref<Resource> resource = p_load_token.res_if_unregistered;
if (!resource.is_valid()) {
if (r_error) {
*r_error = FAILED;
}
}
return resource;
}
}
bool ResourceLoader::_ensure_load_progress() {
// Some servers may need a new engine iteration to allow the load to progress.
// Since the only known one is the rendering server (in single thread mode), let's keep it simple and just sync it.
// This may be refactored in the future to support other servers and have less coupling.
if (OS::get_singleton()->get_render_thread_mode() == OS::RENDER_SEPARATE_THREAD) {
return false; // Not needed.
}
RenderingServer::get_singleton()->sync();
return true;
}
Ref<Resource> ResourceLoader::ensure_resource_ref_override_for_outer_load(const String &p_path, const String &p_res_type) {
ERR_FAIL_COND_V(load_nesting == 0, Ref<Resource>()); // It makes no sense to use this from nesting level 0.
const String &local_path = _validate_local_path(p_path);
HashMap<String, Ref<Resource>> &overrides = res_ref_overrides[load_nesting - 1];
HashMap<String, Ref<Resource>>::Iterator E = overrides.find(local_path);
if (E) {
return E->value;
} else {
Object *obj = ClassDB::instantiate(p_res_type);
ERR_FAIL_NULL_V(obj, Ref<Resource>());
Ref<Resource> res(obj);
if (!res.is_valid()) {
memdelete(obj);
ERR_FAIL_V(Ref<Resource>());
}
overrides[local_path] = res;
return res;
}
}
Ref<Resource> ResourceLoader::get_resource_ref_override(const String &p_path) {
DEV_ASSERT(p_path == _validate_local_path(p_path));
HashMap<int, HashMap<String, Ref<Resource>>>::Iterator E = res_ref_overrides.find(load_nesting);
if (!E) {
return nullptr;
}
HashMap<String, Ref<Resource>>::Iterator F = E->value.find(p_path);
if (!F) {
return nullptr;
}
return F->value;
}
bool ResourceLoader::exists(const String &p_path, const String &p_type_hint) {
String local_path = _validate_local_path(p_path);
if (ResourceCache::has(local_path)) {
return true; // If cached, it probably exists
}
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;
}
void ResourceLoader::add_resource_format_loader(Ref<ResourceFormatLoader> p_format_loader, bool p_at_front) {
ERR_FAIL_COND(p_format_loader.is_null());
ERR_FAIL_COND(loader_count >= MAX_LOADERS);
if (p_at_front) {
for (int i = loader_count; i > 0; i--) {
loader[i] = loader[i - 1];
}
loader[0] = p_format_loader;
loader_count++;
} else {
loader[loader_count++] = p_format_loader;
}
}
void ResourceLoader::remove_resource_format_loader(Ref<ResourceFormatLoader> p_format_loader) {
ERR_FAIL_COND(p_format_loader.is_null());
// Find loader
int i = 0;
for (; i < loader_count; ++i) {
if (loader[i] == p_format_loader) {
break;
}
}
ERR_FAIL_COND(i >= loader_count); // Not found
// Shift next loaders up
for (; i < loader_count - 1; ++i) {
loader[i] = loader[i + 1];
}
loader[loader_count - 1].unref();
--loader_count;
}
int ResourceLoader::get_import_order(const String &p_path) {
String local_path = _path_remap(_validate_local_path(p_path));
for (int i = 0; i < loader_count; i++) {
if (!loader[i]->recognize_path(local_path)) {
continue;
}
return loader[i]->get_import_order(p_path);
}
return 0;
}
String ResourceLoader::get_import_group_file(const String &p_path) {
String local_path = _path_remap(_validate_local_path(p_path));
for (int i = 0; i < loader_count; i++) {
if (!loader[i]->recognize_path(local_path)) {
continue;
}
return loader[i]->get_import_group_file(p_path);
}
return String(); //not found
}
bool ResourceLoader::is_import_valid(const String &p_path) {
String local_path = _path_remap(_validate_local_path(p_path));
for (int i = 0; i < loader_count; i++) {
if (!loader[i]->recognize_path(local_path)) {
continue;
}
return loader[i]->is_import_valid(p_path);
}
return false; //not found
}
bool ResourceLoader::is_imported(const String &p_path) {
String local_path = _path_remap(_validate_local_path(p_path));
for (int i = 0; i < loader_count; i++) {
if (!loader[i]->recognize_path(local_path)) {
continue;
}
return loader[i]->is_imported(p_path);
}
return false; //not found
}
void ResourceLoader::get_dependencies(const String &p_path, List<String> *p_dependencies, bool p_add_types) {
String local_path = _path_remap(_validate_local_path(p_path));
for (int i = 0; i < loader_count; i++) {
if (!loader[i]->recognize_path(local_path)) {
continue;
}
loader[i]->get_dependencies(local_path, p_dependencies, p_add_types);
}
}
Error ResourceLoader::rename_dependencies(const String &p_path, const HashMap<String, String> &p_map) {
String local_path = _path_remap(_validate_local_path(p_path));
for (int i = 0; i < loader_count; i++) {
if (!loader[i]->recognize_path(local_path)) {
continue;
}
return loader[i]->rename_dependencies(local_path, p_map);
}
return OK; // ??
}
void ResourceLoader::get_classes_used(const String &p_path, HashSet<StringName> *r_classes) {
String local_path = _validate_local_path(p_path);
for (int i = 0; i < loader_count; i++) {
if (!loader[i]->recognize_path(local_path)) {
continue;
}
return loader[i]->get_classes_used(p_path, r_classes);
}
}
String ResourceLoader::get_resource_type(const String &p_path) {
String local_path = _validate_local_path(p_path);
for (int i = 0; i < loader_count; i++) {
String result = loader[i]->get_resource_type(local_path);
if (!result.is_empty()) {
return result;
}
}
return "";
}
String ResourceLoader::get_resource_script_class(const String &p_path) {
String local_path = _validate_local_path(p_path);
for (int i = 0; i < loader_count; i++) {
String result = loader[i]->get_resource_script_class(local_path);
if (!result.is_empty()) {
return result;
}
}
return "";
}
ResourceUID::ID ResourceLoader::get_resource_uid(const String &p_path) {
String local_path = _validate_local_path(p_path);