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/*
 * Copyright (c) 2016-2021 jMonkeyEngine
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
 *   may be used to endorse or promote products derived from this software
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 */
package com.jme3.util;

import com.jme3.scene.*;

/**
 * Created by Nehon on 03/10/2016.
 */
public class TangentUtils {

    /**
     * A private constructor to inhibit instantiation of this class.
     */
    private TangentUtils() {
    }

    public static void generateBindPoseTangentsIfNecessary(Mesh mesh){
        if (mesh.getBuffer(VertexBuffer.Type.BindPosePosition) != null) {

            VertexBuffer tangents = mesh.getBuffer(VertexBuffer.Type.Tangent);
            if (tangents != null) {
                VertexBuffer bindTangents = new VertexBuffer(VertexBuffer.Type.BindPoseTangent);
                bindTangents.setupData(VertexBuffer.Usage.CpuOnly,
                        4,
                        VertexBuffer.Format.Float,
                        BufferUtils.clone(tangents.getData()));

                if (mesh.getBuffer(VertexBuffer.Type.BindPoseTangent) != null) {
                    mesh.clearBuffer(VertexBuffer.Type.BindPoseTangent);
                }
                mesh.setBuffer(bindTangents);
                tangents.setUsage(VertexBuffer.Usage.Stream);
            }
        }
    }
}