#include "Camera.h"

Camera::Camera(float yFOV, float aspectRatio, float nearClip, float farClip)
{
	m_FOV = yFOV;
	m_AspectRatio = aspectRatio;
	m_NearClip = nearClip;
	m_FarClip = farClip;

	m_Position = glm::vec3(0.0);
	m_Pitch = 0.f;
	m_Yaw = 0.f;

	UpdateProjectionMatrix();
	UpdateViewMatrix();
}

glm::vec3 Camera::Forward()
{
	return glm::rotate(glm::vec3(0.f, 0.f, -1.f), -m_Yaw, glm::vec3(0.f, 1.f, 0.f));
}

glm::vec3 Camera::Right()
{
	return glm::rotate(glm::vec3(1.f, 0.f, 0.f), -m_Yaw, glm::vec3(0.f, 1.f, 0.f));
}

glm::mat4 Camera::Orientation()
{
	glm::mat4 orientation(1.f);
	orientation = glm::rotate(orientation, m_Pitch, glm::vec3(1.f, 0.f, 0.f));
	orientation = glm::rotate(orientation, m_Yaw, glm::vec3(0.f, 1.f, 0.f));
	return orientation;
}

void Camera::AspectRatio(float val)
{
	m_AspectRatio = val;
	UpdateProjectionMatrix();
}

void Camera::Position(glm::vec3 val)
{
	m_Position = val;
	UpdateViewMatrix();
}


void Camera::Pitch(float val)
{
	m_Pitch = val;
	UpdateViewMatrix();
}

void Camera::Yaw(float val)
{
	m_Yaw = val;
	UpdateViewMatrix();
}

void Camera::UpdateProjectionMatrix()
{
	m_ProjectionMatrix = glm::perspective(
		m_FOV,
		m_AspectRatio,
		m_NearClip,
		m_FarClip
		);
}

void Camera::UpdateViewMatrix()
{
	m_ViewMatrix = glm::translate(Orientation(), -m_Position);
}