Camera.h

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// File: Camera.h
// Description: A system for setting up a callback to opengl for window resizing and calculating the view transforms
// Author(s): Aidan Hartman (aidan.hartman@digipen.edu)
// 2025 / 10 / 06
// (C) Digipen 2025
//   ____   __                  __  __
// /\__  _\/\ \                /\ \/\ \
// \/_/\ \/\ \ \___      __    \ \ \_\ \    ___   __  __    ____     __
//    \ \ \ \ \  _ `\  /'__`\   \ \  _  \  / __`\/\ \/\ \  /',__\  /'__`\
//     \ \ \ \ \ \ \ \/\  __/    \ \ \ \ \/\ \L\ \ \ \_\ \/\__, `\/\  __/
//      \ \_\ \ \_\ \_\ \____\    \ \_\ \_\ \____/\ \____/\/\____/\ \____\
//       \/_/  \/_/\/_/\/____/     \/_/\/_/\/___/  \/___/  \/___/  \/____/
#pragma once
#include "opengl.h"
#include "Eigen/Dense"
#include "Framework/System.h"
 
//Forward declarations
struct GLFWwindow;
 
 
namespace sys
{
class Camera : public System
{
public:
#pragma region static_functions
    static float farPlane;
    static float nearPlane;

    static auto getEnum() -> Type
    {
        return Type::Camera;
    }
    
    static auto init(GLFWwindow* window, int width, int height) -> void;

    static auto view() -> const Eigen::Matrix4f&;
    static auto projection() -> const Eigen::Matrix4f&;
 
    static auto screen() -> const Eigen::Matrix4f&;
#pragma endregion
 
    Camera();
    ~Camera() override                 = default;
    Camera(const Camera& other) = default;
    Camera(Camera&& other) noexcept;
    auto operator=(const Camera& other) -> Camera&;
    auto operator=(Camera&& other) noexcept -> Camera& = default;
 
 
#pragma region overridden_functions
 
    auto clone() const -> std::unique_ptr<GameObject> override
    {
        return std::make_unique<Camera>(*this);
    }
 
    auto onUpdate(float dt) -> void override;
 
    auto endWindow() -> void override
    {
    }; // for debug ImGUI
 
protected:
    auto systemShowMenu() -> void override;
 
public:
    auto onRender() -> void override;
    auto load(const Stream& stream) -> void override;
    auto save(Stream& stream) const -> void override;
 
#pragma endregion
 
#pragma region Camera_Functions

    static void calculateAllTransforms(int width, int height);
 
#pragma endregion
 
private:
#pragma region member_variables
 
#pragma endregion
 
#pragma region helper_functions

    static auto resizeViewport(GLFWwindow* window, int width, int height) -> void;

    static auto calculateProjection(int width, int height, Eigen::Vector3f cameraPos) -> void;
    
    static auto calculateScreen(int w, int h) -> void;

    static auto lookAt(const Eigen::Vector3f& eye, const Eigen::Vector3f center,
                       const Eigen::Vector3f up) -> Eigen::Matrix4f;
 
 
#pragma endregion
 
#pragma region static_variables
    
    static Eigen::Matrix4f viewTransform;
    static Eigen::Matrix4f projectionTransform;
    static Eigen::Matrix4f NDCToScreen;
 
#pragma endregion
 
 
};
}