Camera.h

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#pragma once
 
#define LNC_PI 3.14159265358979323846
#define LNC_RADIANS(deg) (deg * LNC_PI / 180.0)
 
#include "Vec3.h"
#include "Mat4.h"

class Camera {
  Vec3 position;   
  Vec3 direction;  
  Vec3 right, up;  
  Vec3 worldUp;    
 
  float yaw{ -90.0f };  
  float pitch{ 0.0f };  
 
  float moveSpeed;      
  bool movingFront{ false }; 
  bool movingBack{ false };  
  bool movingLeft{ false };  
  bool movingRight{ false }; 
 
  float mouseSens;      
  float mouseX{ -1.0f }, mouseY{ -1.0f }; 
  bool mouseEnabled{ false };              

  void updateDirection() {
    float dirX = cos(LNC_RADIANS(yaw)) * cos(LNC_RADIANS(pitch));
    float dirY = sin(LNC_RADIANS(pitch));
    float dirZ = sin(LNC_RADIANS(yaw)) * cos(LNC_RADIANS(pitch));
    direction = Vec3::normalize(Vec3(dirX, dirY, dirZ));
    right     = Vec3::normalize(Vec3::cross(direction, worldUp));
    up        = Vec3::normalize(Vec3::cross(right, direction));
  }
 
public:

  Camera(Vec3 position, float moveSpeed = 0.015f, float mouseSens = 0.15f, Vec3 worldUp = Vec3(0.0f, 1.0f, 0.0f)) {
    this->position = position;
    this->moveSpeed = moveSpeed;
    this->mouseSens = mouseSens;
    this->worldUp = worldUp;
    updateDirection();
  }


  void moveFront(bool b) { movingFront = b; }

  void moveBack(bool b) { movingBack = b; }

  void moveRight(bool b) { movingRight = b; }

  void moveLeft(bool b) { movingLeft = b; }


  void enableMouse() { mouseEnabled = true; }

  void disableMouse() {
    mouseEnabled = false;
    mouseX = mouseY = -1.0f;
  }

  void mouseMove(float xPosition, float yPosition) {
    if (!mouseEnabled) {
      return;
    }
    else if (mouseX == -1.0f && mouseY == -1.0f) {
      mouseX = xPosition;
      mouseY = yPosition;
      return;
    }
 
    float xOffset = (xPosition - mouseX) * mouseSens;
    float yOffset = (mouseY - yPosition) * mouseSens;
 
    mouseX = xPosition;
    mouseY = yPosition;
 
    yaw += xOffset;
    pitch += yOffset;
 
    if (pitch > 89.0f) pitch = 89.0f;
    else if (pitch < -89.0f) pitch = -89.0f;
 
    updateDirection();
  }


  void updatePosition() {
    if (movingFront) position = position + (direction * moveSpeed);
    if (movingBack)  position = position - (direction * moveSpeed);
    if (movingRight) position = position + (right * moveSpeed);
    if (movingLeft)  position = position - (right * moveSpeed);
  }

  Mat4 viewMatrix() {
    return Mat4::lookAt(position, position + direction, up);
  }
};