Camera.h

#ifndef _CAMERA_H_
#define _CAMERA_H_

#include <glm/glm.hpp>

class Camera
{
public:
    Camera(const glm::vec3& position, const glm::vec3& target, const glm::vec3& up, int width, int height, float nearPlane, float farPlane, float fov);

    // setter
    void setPerspective(int width, int height, float nearPlane, float farPlane, float fov);
    void setDistance(float nearPlane, float farPlane);
    void setWindowSize(int width, int height);
    void setPosition(const glm::vec3& position);
    void setTarget(const glm::vec3& target);
    void setUp(const glm::vec3& up);
    void setView(const glm::vec3& position, const glm::vec3& target, const glm::vec3& up);

    // getter
    const glm::vec3& getPosition() const;
    const glm::vec3& getTarget() const;
    const glm::vec3& getUp() const;

    const glm::mat4& getView() const;
    const glm::mat4& getInverseView() const;
    const glm::mat4& getPerspective() const;
    const glm::mat4& getVP() const;

    float getRatio() const;
    float getNearPlane() const;
    float getFarPlane() const;
    float getFieldOfView() const;
    int getWidth() const;
    int getHeight() const;
    
    void getMouseRay(float mouseX, float mouseY, glm::vec3& rayOrigin, glm::vec3& rayDirection);

    void updateTransform();
private:
    int _width, _height; // window
    float _ratio;
    float _nearPlane, _farPlane;
    float _fov; // in degrees

    glm::vec3 _position;
    glm::vec3 _target;
    glm::vec3 _up;

    glm::mat4 _view; // look in direction Z-, Y+ is up
    glm::mat4 _invView;
    glm::mat4 _perspective;
    glm::mat4 _vp;

    bool _changedView, _changedPerspective;

};

#endif