#include "..\header\Camera.h"
#include <glm\gtc\matrix_transform.hpp>


/////////////////////////////////////////////////////////////////////////
// constructor/destructor

Camera::Camera(int width, int height):
	fFOV(45),
	fMinView(0.1f),
	fMaxView(100.0f),
	iWidth(width),
	iHeight(height),
	dTranslationX(0),
	dTranslationY(0),
	dTranslationZ(5)
{
}


Camera::~Camera()
{
}


/////////////////////////////////////////////////////////////////////////
// private functions

void Camera::updateMatrices()
{
	m4x4Projection = glm::perspective(fFOV, float(iWidth) / float(iHeight), fMinView, fMaxView);
	m4x4View = glm::lookAt(
		glm::vec3(dTranslationX, dTranslationY, dTranslationZ),
		glm::vec3(dTranslationX, dTranslationY, dTranslationZ - 1),
		glm::vec3(0, 1, 0)
	);
}


/////////////////////////////////////////////////////////////////////////
// public getter

glm::mat4 Camera::getMatrix()
{
	updateMatrices();
	return m4x4Projection * m4x4View;
}


/////////////////////////////////////////////////////////////////////////
// public setter

void Camera::setFOV(float fov)
{
	fFOV = fov;
}

void Camera::setMinView(float distance)
{
	fMinView = distance;
}

void Camera::setMaxView(float distance)
{
	fMaxView = distance;
}

void Camera::setSize(int width, int height)
{
	iWidth = width;
	iHeight = height;
}

void Camera::add2x(double value)
{
	dTranslationX += value;
}

void Camera::add2y(double value)
{
	dTranslationY += value;
}

void Camera::add2z(double value)
{
	dTranslationZ += value;
}