#include "camera2d.hpp"

namespace yage
{

Camera2D::Camera2D(int screen_width, int screen_height) :
    position_(0.f, 0.f),
    camera_matrix_(1.f),
    ortho_matrix_(glm::ortho(0.f, (float)screen_width, 0.f, (float)screen_height))
{}

Camera2D::~Camera2D()
{}

void Camera2D::update()
{
    if(matrix_needs_update_)
    {
	glm::vec3 translate(-position_.x, -position_.y, 0.f);
	glm::vec3 scale(scale_, scale_, 0.f);
	    
	camera_matrix_=glm::translate(ortho_matrix_, translate);
	camera_matrix_=glm::scale(glm::mat4(1.f), scale)*camera_matrix_;

	matrix_needs_update_=false;
    }
}

} // yage