Scene.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "SceneObject.hpp"
 
#include "CeresEngine/DataTypes.hpp"
#include "CeresEngine/Macros.hpp"
 
#include "CeresEngine/Foundation/Hash.hpp"
#include "CeresEngine/Foundation/ScopeExit.hpp"
 
#include "CeresEngine/Entity/Entity.hpp"
#include "CeresEngine/Entity/World.hpp"
#include "CeresEngine/Renderer/RendererSceneSettings.hpp"
#include "CeresEngine/Resource/Resource.hpp"
 
namespace CeresEngine {
 
    class Light;
    class Camera;
    class Renderable;
 
    struct ShadowSettings final {
        double directionalShadowDistance = 250.0;
 
        UInt32 numberOfCascades = 4;
 
        double cascadeDistributionExponent = 3.0f;
 
        UInt32 shadowFilteringQuality = 4;
 
    public: // Reflection
        template<typename Processor> static constexpr void reflect(Processor&& RTTI) {
            CE_REFL_DATA(directionalShadowDistance);
            CE_REFL_DATA(numberOfCascades);
            CE_REFL_DATA(cascadeDistributionExponent);
            CE_REFL_DATA(shadowFilteringQuality);
        }
    };
 
    struct SceneSettings final {
        ShadowSettings shadowSettings;
 
    public: // Reflection
        template<typename Processor> static constexpr void reflect(Processor&& RTTI) { CE_REFL_DATA(shadowSettings); }
    };
 
    class Scene : public TResource<Scene> {
        using super = TResource<Scene>;
        friend class SceneManager;
        CE_META_CLASS_FRIEND(Scene);
 
    private:
        SceneManager* mSceneManager = nullptr;
 
        World mWorld{*this};
 
        SceneSettings mSettings;
 
        RendererSceneSettings mRendererSettings;
 
    public:
        using super::super;
        ~Scene() noexcept override;
 
    public:
        void update(const double dt) {
            mWorld.systems.update(dt);
            mWorld.entities.update();
        }
 
    public:
        [[nodiscard]] const SceneSettings& getSettings() const { return mSettings; }
 
        void setSettings(const SceneSettings& settings);
 
        [[nodiscard]] const RendererSceneSettings& getRendererSettings() const { return mRendererSettings; }
 
        void setRendererSettings(const RendererSceneSettings& rendererSettings);
 
        template<CInvocable<RendererSceneSettings&> Func> decltype(auto) updateRendererSettings(Func&& func) noexcept {
            RendererSceneSettings settings = getRendererSettings();
            const ScopeExit commitSettings([&]() { setRendererSettings(settings); });
            return func(settings);
        }
 
    public: // Scene Objects
        [[nodiscard]] SceneObject create();
 
        [[nodiscard]] Vector<SceneObject> create(UInt32 n);
 
        template<typename E, typename... Args> [[nodiscard]] inline E create(Args&&... args);
 
        template<typename E, typename Block, typename... Args> inline E createWith(Block&& block, Args&&... args);
 
        [[nodiscard]] Camera createCamera();
 
        [[nodiscard]] Light createLight();
 
        [[nodiscard]] Renderable createRenderable();
 
        [[nodiscard]] Generator<SceneObject> enumerateChildren() const;
 
    public: // Spawning
        Entity copyObjects(Scene& otherScene, const Entity& parent = nullptr);
 
    public:
        [[nodiscard]] World& getWorld() noexcept { return mWorld; }
 
        [[nodiscard]] const World& getWorld() const noexcept { return mWorld; }
 
    public:
        [[nodiscard]] static Scene* find(const SceneObject& sceneObject);
 
    public: // Reflection
        template<typename Processor> static constexpr void reflect(Processor&& RTTI) {
            CE_REFL_DATA_GETSET(settings, getSettings, setSettings);
            CE_REFL_DATA_GETSET(rendererSettings, getRendererSettings, setRendererSettings);
        }
    };
 
    template<typename E, typename... Args> [[nodiscard]] inline E Scene::create(Args&&... args) {
        return mWorld.entities.create<E>(std::forward<Args>(args)...);
    }
 
    template<typename E, typename Block, typename... Args> inline E Scene::createWith(Block&& block, Args&&... args) {
        return mWorld.entities.createWith<E>(std::forward<Block>(block), std::forward<Args>(args)...);
    }
 
    class SceneManager {
        friend class Scene;
 
    private:
        Vector<Scene*> mScenes;
 
    public:
        void add(const HScene& scene) { add(scene.get()); }
 
        void add(const ScenePtr& scene) { add(scene.get()); }
 
        void add(Scene* const scene);
 
        void remove(const HScene& scene) { remove(scene.get()); }
 
        void remove(const ScenePtr& scene) { remove(scene.get()); }
 
        void remove(Scene* const scene);
 
        void simulate(double dt);
    };
 
} // namespace CeresEngine
 
CE_REFLECT_HASH(CeresEngine::ShadowSettings);
 
CE_REFLECT_HASH(CeresEngine::SceneSettings);
 
CE_ENTITY_OBJECT_HASH(CeresEngine::Scene);