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Add ecs::dispatcher - an event-based ECS system launcher

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This commit is contained in:
Nikita Lisitsa 2024-02-03 15:22:33 +03:00
parent 5533826711
commit 13a86a76c8
1 changed files with 93 additions and 0 deletions
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libs/ecs/include/psemek/ecs/dispatcher.hpp Normal file
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#pragma once
#include <psemek/ecs/container.hpp>
#include <psemek/util/hash_table.hpp>
#include <psemek/util/function.hpp>
#include <concepts>
namespace psemek::ecs
{
struct dispatcher
{
dispatcher() = default;
dispatcher(ecs::container & container)
: container_(&container)
{}
explicit operator bool() const
{
return container_ != nullptr;
}
ecs::container & container()
{
return *container_;
}
template <typename Event, typename Handler>
void handler(Handler handler)
{
handlers_[Event::uuid()].push_back([handler = std::move(handler), this](void const * event_ptr){
auto const & event = *reinterpret_cast<Event const *>(event_ptr);
if constexpr (std::invocable<Handler, Event const &, ecs::container &>)
{
handler(event, *container_);
}
else
{
handler(event);
}
});
}
template <typename Event, typename ... Components, typename System>
void system(System system)
{
handlers_[Event::uuid()].push_back([system = std::move(system), this, cache = container_->cache<Components...>()](void const * event_ptr){
auto const & event = *reinterpret_cast<Event const *>(event_ptr);
if constexpr (std::invocable<System, Event const &, ecs::container &, handle, Components & ...>)
{
container_->apply<Components...>([&](ecs::container & container, ecs::handle handle, Components & ... components){
system(event, container, handle, components...);
});
}
else if constexpr (std::invocable<System, Event const &, ecs::container &, Components & ...>)
{
container_->apply<Components...>([&](ecs::container & container, Components & ... components){
system(event, container, components...);
});
}
else if constexpr (std::invocable<System, Event const &, handle, Components & ...>)
{
container_->apply<Components...>([&](ecs::handle handle, Components & ... components){
system(event, handle, components...);
});
}
else
{
container_->apply<Components...>([&](Components & ... components){
system(event, components...);
});
}
});
}
template <typename Event>
void dispatch(Event const & event)
{
for (auto & handler : handlers_[event.uuid()])
handler(&event);
}
private:
ecs::container * container_;
util::hash_map<util::uuid, std::vector<util::function<void(void const *)>>> handlers_;
};
}