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// SPDX-License-Identifier: BSD-2-Clause
// Copyright (c) 2025 Kirill Dmitrievich
// File: resource.cc
// Description: Resource management
#include "core/pch.hh"
#include "core/resource/resource.hh"
struct ResourceLoader final {
ResourceLoadFunc load_func;
ResourceFreeFunc free_func;
emhash8::HashMap<std::string, std::shared_ptr<const void>> resources;
std::vector<std::shared_ptr<const void>> cache;
std::string class_name;
};
static emhash8::HashMap<std::type_index, std::unique_ptr<ResourceLoader>> loaders;
void resource::detail::register_loader(const std::type_info& type, ResourceLoadFunc load_func, ResourceFreeFunc free_func)
{
assert(load_func);
assert(free_func);
auto type_index = std::type_index(type);
auto loader = std::make_unique<ResourceLoader>();
loader->class_name = type.name();
loader->load_func = load_func;
loader->free_func = free_func;
assert(!loaders.contains(type_index));
loaders.insert_or_assign(type_index, std::move(loader));
}
std::shared_ptr<const void> resource::detail::load_resource(const std::type_info& type, std::string_view name, std::uint32_t flags)
{
auto name_str = std::string(name);
auto type_index = std::type_index(type);
auto loader = loaders.find(type_index);
if(loader == loaders.cend()) {
spdlog::error("resource: no loader registered for type [{}]", type.name());
return nullptr;
}
auto resource_it = loader->second->resources.find(name_str);
if(resource_it == loader->second->resources.cend()) {
auto resource_raw = loader->second->load_func(name_str.c_str(), flags);
if(resource_raw == nullptr) {
spdlog::error("resource: {} [{}]: load failed", loader->second->class_name, name);
return nullptr;
}
std::shared_ptr<const void> resource_ptr(resource_raw, [](const void* ptr) { /* empty */ });
auto loaded_it = loader->second->resources.insert_or_assign(name_str, std::move(resource_ptr));
if(flags & RESOURCE_CACHE) {
loader->second->cache.push_back(loaded_it.first->second);
}
return loaded_it.first->second;
}
return resource_it->second;
}
std::shared_ptr<const void> resource::detail::find_resource(const std::type_info& type, std::string_view name)
{
auto name_str = std::string(name);
auto type_index = std::type_index(type);
auto loader = loaders.find(type_index);
if(loader == loaders.cend()) {
spdlog::error("resource: no loader registered for type [{}]", type.name());
return nullptr;
}
auto resource_it = loader->second->resources.find(name_str);
if(resource_it == loader->second->resources.cend()) {
spdlog::error("resource: {} [{}]: not found", loader->second->class_name, name);
return nullptr;
}
return resource_it->second;
}
void resource::hard_cleanup(void)
{
for(auto& [type_index, loader] : loaders) {
loader->cache.clear();
for(auto& [name, resource_ptr] : loader->resources) {
if(resource_ptr.use_count() > 1) {
spdlog::warn("resource: zombie resource: {} [{}] [use_count={}]", name, loader->class_name, resource_ptr.use_count());
}
else {
spdlog::debug("resource: releasing {} [{}]", name, loader->class_name);
}
loader->free_func(resource_ptr.get());
}
loader->resources.clear();
}
loaders.clear();
}
void resource::soft_cleanup(void)
{
for(auto& [type_index, loader] : loaders) {
auto resource_it = loader->resources.begin();
while(resource_it != loader->resources.end()) {
if(resource_it->second.use_count() <= 1) {
spdlog::debug("resource: releasing {} [{}]", resource_it->first, loader->class_name);
loader->free_func(resource_it->second.get());
resource_it = loader->resources.erase(resource_it);
continue;
}
resource_it = std::next(resource_it);
}
}
}
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