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/*
 * Copyright (c) 2012, Metron, Inc.
 * 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 Metron, Inc. 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 METRON, INC. 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 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package com.metsci.glimpse.gl.attribute;

import java.nio.FloatBuffer;

import javax.media.opengl.GL2;

import com.jogamp.common.nio.Buffers;

public class GLFloatBuffer extends GLBuffer
{
    public GLFloatBuffer( int length, int elementSize )
    {
        super( length, elementSize );
    }

    @Override
    public final int getGlType( )
    {
        return GL2.GL_FLOAT;
    }

    @Override
    public int getBytesPerElement( )
    {
        return Buffers.SIZEOF_FLOAT;
    }

    public void mutate( Mutator mutator )
    {
        lock.lock( );
        try
        {
            // asFloatBuffer( ) only creates a view of the remaining data
            // between position and limit, we want a view of the whole
            data.clear( );
            FloatBuffer floatData = data.asFloatBuffer( );

            mutator.mutate( floatData, elementSize );

            // the limit/position of floatData and data are independent
            // update data.limit() to reflect changes made to floatData
            data.position( 0 );
            data.limit( floatData.limit( ) * getBytesPerElement( ) );

            makeDirty( );
        }
        finally
        {
            lock.unlock( );
        }
    }

    public static interface Mutator
    {
        public void mutate( FloatBuffer data, int length );
    }
}