camera.hpp

/*
    KTech, Kaup's C++ 2D terminal game engine library.
    Copyright (C) 2023-2025 Ethan Kaufman (AKA Kaup)
 
    This file is part of KTech.
 
    KTech 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
    any later version.
 
    KTech 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 KTech. If not, see <https://www.gnu.org/licenses/>.
*/
 
#pragma once
 
#define KTECH_DEFINITION
#include "../ktech.hpp"
#undef KTECH_DEFINITION
#include "../utility/id.hpp"
#include "../basic/cell.hpp"
#include "../basic/point.hpp"
#include "../basic/upoint.hpp"
 
#include <limits>
#include <string>
#include <vector>
 
class KTech::Camera
{
public:
    Engine& engine; 
    const ID<Camera> m_id{ID<Camera>::Unique()}; 
    std::string m_name; 
    ID<Map> m_parentMap; 
 
    Point m_pos; 
    UPoint m_res; 
    Cell m_background = Cell(' ', RGB(0, 0, 0), RGB(0, 0, 0)); 
    std::vector<Cell> m_image; 
 
    Camera(Engine& engine, Point position = Point(0, 0), UPoint resolution = UPoint(10, 10), const std::string& name = "");
    Camera(Engine& engine, const ID<Map>& parentMap, Point position = Point(0, 0), UPoint resolution = UPoint(10, 10), const std::string& name = "");
    virtual ~Camera();
 
    auto EnterMap(const ID<Map>& map) -> bool;
    auto LeaveMap() -> bool;
 
    void Resize(UPoint resolution);
 
    void Render();
    void Render(const std::vector<ID<Layer>>& layers);
    void Draw(Point position = Point(0, 0), UPoint start = UPoint(0, 0), UPoint end = UPoint(0, 0), uint8_t alpha = std::numeric_limits<uint8_t>::max());
    void RenderDrawPrint();
 
protected:
    virtual auto OnTick() -> bool;
 
private:
    inline void RenderBackground();
    inline void RenderSimple(uint8_t layerAlpha, Object* object, Texture& texture);
    inline void RenderComplex(uint8_t layerAlpha, Object* object, Texture& texture);
    inline void RenderForeground(const RGBA& frgba, const RGBA& brgba);
 
    friend class KTech::Memory;
};