/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */

#include "Camera.hpp"

namespace OpenVulkano::Scene
{

	Ray Camera::CastRay(const Math::Vector2i& xy) const
	{
		using namespace Math::Utils;

		// nds
		float ndsX = (2.f * xy.x) / m_width - 1.0f;
		float ndsY = (2.f * xy.y) / m_height - 1.0f;

		Math::Vector4f rayClip = { ndsX, ndsY, 0, 1.f };

		Math::Vector4f rayEye = inverse(m_projection) * rayClip;
		rayEye.z = -1;
		rayEye.a = 0;

		Math::Vector3f rayWorld = normalize(GetWorldMatrix() * rayEye);

		Ray r(GetPosition(), rayWorld);
		return r;
	}
}