#ifndef PERIPHERALS_H_
#define PERIPHERALS_H_

#include "GLFW/glfw3.h"

extern GLdouble mouse_x, mouse_y;
extern GLfloat M[16];

extern bool is_dragging, ctrl_pressed;
extern GLdouble drag_start_x, drag_start_y;

// function that is called whenever a keyboard event occurs; defines how
// keyboard input will be handled
void key_callback(GLFWwindow *window, int key, int scancode, int action,
                  int mods);

// function that is called whenever a mouse or trackpad button press event
// occurs
void mouse_button_callback(GLFWwindow *window, int button, int action,
                           int mods);

// function that is called whenever a cursor motion event occurs
void cursor_pos_callback(GLFWwindow *window, double xpos, double ypos);

#endif