Scene.hpp

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/*
   Copyright 2022 Rishi Challa
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
       http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
 
#pragma once
 
#include <Kale/Engine/Node/Node.hpp>
#include <Kale/Core/Events/Events.hpp>
#include <Kale/Math/Transform/Transform.hpp>
 
#include <list>
#include <vector>
#include <queue>
#include <utility>
#include <memory>
#include <mutex>
#include <condition_variable>
 
#include <nlohmann/json.hpp>
 
namespace Kale {
 
    using JSON = nlohmann::json;
    
    class Scene : public EventHandler {
    private:
 
        inline static std::unordered_map<std::string, std::function<std::shared_ptr<Node>(JSON)>> nodeMap;
 
        std::list<std::shared_ptr<Node>> nodes;
 
        std::vector<std::list<std::shared_ptr<Node>>> updateNodes;
 
        std::vector<std::list<std::shared_ptr<Node>>> preUpdateNodes;
 
        std::vector<std::pair<float, float>> threadedNodePerformanceTimes;
 
        std::queue<std::shared_ptr<Node>> nodesToAdd;
 
        std::queue<std::shared_ptr<Node>> nodesToRemove;
 
        std::mutex nodeQueueUpdateMutex;
 
        std::mutex nodePreUpdateMutex;
 
        std::condition_variable nodePreUpdateCondVar;
 
        size_t nodesPreUpdated;
 
        size_t generation;
 
        Transform worldToScreen;
 
        void render(float deltaTime) const;
 
        void update(size_t threadNum, float deltaTime);
 
        void updateNodeStructures();
 
        friend class Application;
        friend class Node;
 
    protected:
 
        Vector4f bgColor = 0xFFFFFF;
 
        Camera camera;
        
        Vector2f viewport;
 
        Rect sceneBounds;
 
        template <typename T> void addNode(std::shared_ptr<T>& node) {
            std::shared_ptr<Kale::Node> nodePtr = std::dynamic_pointer_cast<Kale::Node>(node);
            std::lock_guard guard(nodeQueueUpdateMutex);
            nodesToAdd.push(nodePtr);
        }
 
        void removeNode(std::shared_ptr<Node>& node);
 
        template <typename T> void removeNode(std::shared_ptr<T>& node) {
            std::shared_ptr<Kale::Node> nodePtr = std::dynamic_pointer_cast<Kale::Node>(node);
            std::lock_guard guard(nodeQueueUpdateMutex);
            nodesToRemove.push(nodePtr);
        }
 
        virtual void onPresent();
 
        virtual void onSceneChange();
 
        virtual void onUpdate(size_t threadNum, float deltaTime);
 
        virtual void onPreUpdate(size_t threadNum, float deltaTime);
 
        void onWindowResize(Vector2ui oldSize, Vector2ui newSize) override;
 
        friend class Application;
 
    public:
 
        Scene();
 
        Scene(const std::string& filename);
 
        const std::list<std::shared_ptr<Node>>& getNodes() const;
 
        Color getBgColor() const;
 
        const Camera& getCamera() const;
 
        Vector2f getViewport() const;
 
        Rect getSceneBounds() const;
 
        static void addNodeSaveStateConstructor(const std::string& key, std::function<std::shared_ptr<Node>(JSON)> constructor) {
            nodeMap[key] = constructor;
        }
 
    };
}