carCamera.h

#ifndef CAR_CAMERA_H
#define CAR_CAMERA_H

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/quaternion.hpp>
#include "gameObject.hpp"

class CarCamera
{
public:
  glm::vec3 Position;
  glm::vec3 Front;
  glm::vec3 Up;
  glm::vec3 Right;
  glm::vec3 WorldUp;
  float Zoom = 70.0f;

  glm::vec3 offset;

  GameObject *targetCar;

  CarCamera()
  {
  }

  void initialize(GameObject *car, glm::vec3 camOffset = glm::vec3(0.0f, 2.6f, -6.6f))
  {
    targetCar = car;
    offset = camOffset;
    WorldUp = glm::vec3(0.0f, 1.0f, 0.0f);
    Position = targetCar->pos;
  }

  void update(float deltaTime)
  {
    if (!targetCar)
      return;

    glm::vec3 carPos = targetCar->pos;

    btQuaternion btQuat = targetCar->rigidBody->getOrientation();
    glm::quat rotation(btQuat.w(), btQuat.x(), btQuat.y(), btQuat.z());

    glm::vec3 rotatedOffset = rotation * offset;

    Position = glm::mix(Position, carPos + rotatedOffset, 6 * deltaTime);

    Front = glm::normalize(carPos - Position);

    Right = glm::normalize(glm::cross(Front, WorldUp));
    Up = glm::normalize(glm::cross(Right, Front));
  }

  glm::mat4 GetViewMatrix()
  {
    return glm::lookAt(Position, targetCar->pos, Up);
  }
};

#endif