render-system.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_GAME_RENDER_SYSTEM_HPP
#define ANTKEEPER_GAME_RENDER_SYSTEM_HPP
 
#include "game/systems/updatable-system.hpp"
#include <engine/scene/collection.hpp>
#include <engine/scene/static-mesh.hpp>
#include <engine/scene/light.hpp>
#include "game/components/scene-component.hpp"
#include <engine/entity/id.hpp>
#include <engine/render/renderer.hpp>
#include <unordered_map>
#include <vector>
#include <memory>
 
class render_system: public updatable_system
{
public:
    explicit render_system(entity::registry& registry);
    ~render_system();
    
    virtual void update(float t, float dt);
    
    void draw(float alpha);
    
    void add_layer(scene::collection* layer);
    void remove_layers();
    
    void set_renderer(::render::renderer* renderer);
 
private:
    void on_scene_construct(entity::registry& registry, entity::id entity_id);
    void on_scene_update(entity::registry& registry, entity::id entity_id);
    void on_scene_destroy(entity::registry& registry, entity::id entity_id);
    
    void on_transform_construct(entity::registry& registry, entity::id entity_id);
    
    entt::observer updated_scene_transforms;
    
    float t;
    float dt;
    ::render::renderer* renderer;
    std::vector<scene::collection*> layers;
};
 
 
#endif // ANTKEEPER_GAME_RENDER_SYSTEM_HPP