/*
 * 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 "MorphableCamera.hpp"

namespace OpenVulkano::Scene
{
	namespace
	{
		Math::Matrix4f BlendMatrices(const Math::Matrix4f& mat1, const Math::Matrix4f& mat2, float t)
		{
			Math::Matrix4f result;
			for (int i = 0; i < 4; ++i)
			{
				result[i] = Math::Utils::mix(mat1[i], mat2[i], t);
			}
			return result;
		}
	}
	void MorphableCamera::UpdateProjectionMatrix()
	{
		PerspectiveCamera::UpdateProjectionMatrix();
		float aspectH = m_aspect;
		float aspectV = 1;
		if (m_morphState == 0) { UpdateViewProjectionMatrix(); }
		else if (m_morphState == 1)
		{
			m_projection = Math::Utils::orthoRH_ZO(-aspectH, aspectH, -aspectV, aspectV, m_nearPlane, m_farPlane);
			UpdateViewProjectionMatrix();
		}
		else
		{
			m_orthoMatrix = Math::Utils::orthoRH_ZO(-aspectH, aspectH, -aspectV, aspectV, m_nearPlane, m_farPlane);
			m_projection = BlendMatrices(m_projection, m_orthoMatrix, m_morphState);
			UpdateViewProjectionMatrix();
		}
	}
}