Maddie Slockbower
366774622b
- Updated License to GPL v3.0 - Added New Math Nodes - Prototype Rendering Code for Debugging Functions
154 lines
4.1 KiB
C++
154 lines
4.1 KiB
C++
// =====================================================================================================================
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// OpenShaderDesigner, an open source software utility to create materials and shaders.
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// Copyright (C) 2024 Medusa Slockbower
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// =====================================================================================================================
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#ifndef ENGINE_EVENTSYSTEM_H
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#define ENGINE_EVENTSYSTEM_H
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#include <open-cpp-utils/unique_id.h>
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#include <cstdint>
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#include <list>
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#include <mutex>
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#define MAX_EVENT_TYPES 256
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namespace ocu = open_cpp_utils;
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namespace OpenShaderDesigner
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{
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/**
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* \brief Base Event class for sending events to the Engine.
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*/
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struct Event
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{
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template<typename T>
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static uint8_t TypeOf() { return static_cast<uint8_t>(ocu::unique_id<uint8_t, T>()); }
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/**
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* \brief Get the Event's type ID.
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* \return A pointer to the Event type ID.
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*/
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virtual inline uint8_t GetID() const = 0;
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};
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/**
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* \brief Base EventHandler for abstraction.
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*/
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class _ImplEventHandler
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{
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virtual bool _HandleEvent(const Event* event) = 0;
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friend class EventSystem;
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};
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/**
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* \brief EventHandler interface for creating custom EventHandlers
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* \tparam EventType The ComponentType of Event handled by the EventHandler
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*/
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template<typename EventType>
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class EventHandler : private _ImplEventHandler
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{
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public:
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using HandledType = EventType; //!< The type handled by the EventHandler
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/**
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* \brief Virtual function for custom EventHandler implementations.
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* \param event The Event being handled.
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*/
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virtual bool HandleEvent(const HandledType* event) = 0;
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private:
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/**
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* \brief Override for abstraction.
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* \param event The Event being handled.
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*/
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bool _HandleEvent(const Event* event) override;
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};
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/**
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* \brief EventSystem for posting Events to be handled.
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*/
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class EventSystem
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{
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public:
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/**
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* \brief Post an Event to be Handled.
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*/
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static void PostEvent(const Event*);
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/**
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* \brief Register an EventHandler with the EventSystem.
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* \tparam T ComponentType of Event handled by the EventHandler.
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*/
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template<typename T>
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static void RegisterHandler(EventHandler<T>*);
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/**
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* \brief Unregister an EventHandler with the EventSystem.
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* \tparam T ComponentType of Event handled by the EventHandler.
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*/
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template<typename T>
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static void UnregisterHandler(EventHandler<T>*);
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private:
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inline static std::list<_ImplEventHandler*> HandlerMap_[MAX_EVENT_TYPES];
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inline static std::mutex Lock_;
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EventSystem(const EventSystem&) = delete;
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EventSystem(EventSystem&&) = delete;
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};
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template<typename T>
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void EventSystem::UnregisterHandler(EventHandler<T>* handler)
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{
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// Thread safe
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std::lock_guard guard(Lock_);
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const uint8_t index = T::ID;
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std::erase(HandlerMap_[index], reinterpret_cast<_ImplEventHandler*>(handler));
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}
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template<typename T>
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void EventSystem::RegisterHandler(EventHandler<T>* handler)
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{
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// Thread safe
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std::lock_guard guard(Lock_);
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const uint8_t index = T::ID;
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HandlerMap_[index].push_back(reinterpret_cast<_ImplEventHandler*>(handler));
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}
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template<typename EventType>
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bool EventHandler<EventType>::_HandleEvent(const Event *event)
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{
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if(EventType::ID != event->GetID()) return false;
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return HandleEvent(reinterpret_cast<const EventType*>(event));
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}
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}
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#define BeginEvent(EVENT) struct EVENT : OpenShaderDesigner::Event \
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{ \
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static inline const uint8_t ID = Event::TypeOf<EVENT>(); \
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inline uint8_t GetID() const override { return ID; }
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#define EndEvent };
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#endif //ENGINE_EVENTSYSTEM_H
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