Camera.cpp

#include "Camera.h"

glm::mat4 Camera::GetViewMatrix()
{
	return glm::lookAt(Position, Position + Front, Up);
}

void Camera::ProcessKeyboard(Camera_Movement direction, float deltaTime)
{
    float velocity = MovementSpeed * deltaTime;
    if (direction == FORWARD) Position += Front * velocity;
    if (direction == BACKWARD) Position -= Front * velocity;
    if (direction == LEFT) Position -= Right * velocity;
    if (direction == RIGHT) Position += Right * velocity;
}

void Camera::ProcessMouseMovement(float xoffset, float yoffset, GLboolean constrainPitch)
{
    xoffset *= MouseSensitivity;
    yoffset *= MouseSensitivity;

    Yaw += xoffset;
    Pitch += yoffset;

    // Make sure that when pitch is out of bounds, screen doesn't get flipped
    if (constrainPitch)
    {
        if (Pitch > 89.0f) Pitch = 89.0f;
        if (Pitch < -89.0f) Pitch = -89.0f;
    }

    // Update Front, Right and Up Vectors using the updated Euler angles
    updateCameraVectors();
}

void Camera::ProcessMouseScroll(float yoffset)
{
    if (Zoom >= 1.0f && Zoom <= 45.0f) Zoom -= yoffset;
    if (Zoom <= 1.0f) Zoom = 1.0f;
    if (Zoom >= 45.0f) Zoom = 45.0f;
}

void Camera::updateCameraVectors()
{
    // Calculate the new Front vector
    glm::vec3 front;
    front.x = cos(glm::radians(Yaw)) * cos(glm::radians(Pitch));
    front.y = sin(glm::radians(Pitch));
    front.z = sin(glm::radians(Yaw)) * cos(glm::radians(Pitch));
    Front = glm::normalize(front);
    // Also re-calculate the Right and Up vector
    Right = glm::normalize(glm::cross(Front, WorldUp));  // Normalize the vectors, because their length gets closer to 0 the more you look up or down which results in slower movement.
    Up = glm::normalize(glm::cross(Right, Front));
}