camera.h

/*
    This file is part of OpenGL-StarterPack (GLSP), an open source OpenGL based framework
    that facilitates and speeds up demo and project creation by offering an abstraction to 
    the basic objects of OpenGL as well as incluing the necessary libraries. 

    MIT License

	Copyright (c) 2024 Antonio Espinosa Garcia

*/
#ifndef __CAMERA__
#define __CAMERA__

#include <GLSP/core.h>
#include <GLSP/object3D.h>

GLSP_NAMESPACE_BEGIN

class Camera : public Object3D
{

private:
    glm::mat4 m_view;
    glm::mat4 m_proj;

    float m_fov;
    float m_near;
    float m_far;
    float m_zoom;

    bool m_perspective{true};

public:
    Camera(glm::vec3 p = glm::vec3(0.0f, 1.0f, -4.0f), glm::vec3 f = glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f)) : Object3D("Camera", p, Object3DType::CAMERA), m_fov(45.0f), m_near(.1f), m_far(100.0f) { set_rotation({-90, 0, 0}); }
    Camera(int width, int height, glm::vec3 p = glm::vec3(0.0f, 1.0f, -4.0f), glm::vec3 f = glm::vec3(0.0f, 0.0f, 1.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f)) : Object3D("Camera", p, Object3DType::CAMERA), m_fov(45.0f), m_near(.1f), m_far(100.0f)
    {
        set_rotation({-90, 0, 0});
        set_projection(width, height);
    }

    inline void set_field_of_view(float fov) { m_fov = fov; }
    inline float get_field_of_view() { return m_fov; }
    inline void set_projection(int width, int height)
    {
        if (m_perspective)
            m_proj = glm::perspective(glm::radians(m_fov), (float)width / (float)height, m_near, m_far);
    }
    inline glm::mat4 get_projection() { return m_proj; }
    inline glm::mat4 get_view() { return get_model_matrix(); }
    inline float get_far() { return m_far; }
    inline void set_far(float f) { m_far = f; }
    inline float get_near() { return m_near; }
    inline void set_near(float n) { m_near = n; }

    inline glm::mat4 get_model_matrix()
    {
        if (m_isDirty)
        {
            m_view = glm::lookAt(m_transform.position, m_transform.position + m_transform.forward, m_transform.up);
            m_isDirty = false;
        }
        return m_view;
    }
};
GLSP_NAMESPACE_END

#endif