camera.h

 #pragma once
#ifndef CAMERA_H
#define CAMERA_H
// Std. Includes
#include <vector>
#include <GL/glew.h>
#include <Eigen/Core>
#include <Eigen/Geometry> 
#include <look_at.h>
#include <vector3G.h>

// Defines several possible options for camera movement. Used as abstraction to stay away from window-system specific input methods
enum Camera_Movement {
    FORWARD,
    BACKWARD,
    LEFT,
    RIGHT
};


// An abstract camera class that processes input and calculates the corresponding Eular Angles, Vectors and Matrices for use in OpenGL
class Camera
{
public:
    // Camera Attributes
    Vector3Gf m_position;
    Vector3Gf m_front;
    Vector3Gf m_up;
    Vector3Gf m_right;
    Vector3Gf m_world_up;
    // Eular Angles
    GLfloat m_yaw;
    GLfloat m_pitch;
    // Camera options
    GLfloat m_movement_speed;
    GLfloat m_mouse_sensitivity;
    GLfloat m_zoom;

    Camera(Vector3Gf position = Vector3Gf(0.0f, 0.0f, 0.0f), Vector3Gf up = Vector3Gf(0.0f, 1.0f, 0.0f), GLfloat yaw = -90.0f, GLfloat pitch = 0.0f);
   
    Eigen::Matrix<GLfloat,4,4> GetViewMatrix();

    void ProcessKeyboard(Camera_Movement direction, GLfloat deltaTime);

    void ProcessMouseMovement(GLfloat xoffset, GLfloat yoffset, GLboolean constrainPitch = true);

    void ProcessMouseScroll(GLfloat yoffset);

private:
    void UpdateCameraVectors();
};
#endif