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#pragma once
// Std. Includes
#include <vector>
// GL Includes
#include <GL/glew.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
// 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
};
// Default camera values
const GLfloat YAW = -90.0f;
const GLfloat PITCH = 0.0f;
const GLfloat SPEED = 3.0f;
const GLfloat SENSITIVTY = 0.2f;
const GLfloat ZOOM = 45.0f;
// An abstract camera class that processes input and calculates the corresponding Eular Angles, Vectors and Matrices for use in OpenGL
class Camera3D {
public:
// Camera3D Attributes
glm::vec3 Position;
glm::vec3 Front;
glm::vec3 Up;
glm::vec3 Right;
glm::vec3 WorldUp;
// Eular Angles
GLfloat Yaw;
GLfloat Pitch;
// Camera3D options
GLfloat MovementSpeed;
GLfloat MouseSensitivity;
GLfloat Zoom;
// Constructor with vectors
explicit Camera3D(glm::vec3 position = glm::vec3(0.0f, 0.0f, 3.0f), glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f),
GLfloat yaw = YAW, GLfloat pitch = PITCH);
// Constructor with scalar values
Camera3D(GLfloat posX, GLfloat posY, GLfloat posZ, GLfloat upX, GLfloat upY, GLfloat upZ, GLfloat yaw, GLfloat pitch);
// Returns the view matrix calculated using Eular Angles and the LookAt Matrix
glm::mat4 GetViewMatrix();
// Processes input received from any keyboard-like input system. Accepts input parameter in the form of camera defined ENUM (to abstract it from windowing systems)
void ProcessKeyboard(Camera_Movement direction, GLfloat deltaTime);
// Processes input received from a mouse input system. Expects the offset value in both the x and y direction.
void ProcessMouseMovement(GLfloat xoffset, GLfloat yoffset, GLboolean constrainPitch = true);
// Processes input received from a mouse scroll-wheel event. Only requires input on the vertical wheel-axis
void ProcessMouseScroll(GLfloat yoffset);
private:
// Calculates the front vector from the Camera3D's (updated) Eular Angles
void updateCameraVectors();
};
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