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/*
 * Copyright (C) 2012 United States Government as represented by the Administrator of the
 * National Aeronautics and Space Administration.
 * All Rights Reserved.
 */
package gov.nasa.worldwind.formats.dds;

/**
 * BlockDXT3 is a data structure representing the compressed alpha and color values in a single DXT2/DXT3
 * block. The DXT3 block contains a 64 bit alpha block, and a 64 bit color block, stored here as the properties
 * alphaBlock and colorBlock. The 64 bit alpha block contains 4x4 alpha values quantized
 * into 4 bits. The 64 bit color block is formatted exactly like the DXT1 color block, except that the color block
 * always represents four colors, regardless of the color ordering in the DXT1 block.
 *
 * @author dcollins
 * @version $Id: BlockDXT3.java 1171 2013-02-11 21:45:02Z dcollins $
 * @see AlphaBlockDXT3
 * @see BlockDXT1
 */
public class BlockDXT3
{
    /**
     * The DXT2/DXT3 alpha block.
     */
    public AlphaBlockDXT3 alphaBlock;
    /**
     * The DXT1 color block.
     */
    public BlockDXT1 colorBlock;

    /**
     * Creates a new DXT2/DXT3 alpha block with all alpha and color values set to 0.
     */
    public BlockDXT3()
    {
        this.alphaBlock = new AlphaBlockDXT3();
        this.colorBlock = new BlockDXT1();
    }

    public BlockDXT3(long alphaValueMask, int color0, int color1, long colorIndexMask)
    {
        this.alphaBlock = new AlphaBlockDXT3(alphaValueMask);
        this.colorBlock = new BlockDXT1(color0, color1, colorIndexMask);
    }

    /**
     * Returns the DXT2/DXT3 alpha block.
     *
     * @return DXT2/DXT3 alpha block.
     */
    public AlphaBlockDXT3 getAlphaBlock()
    {
        return this.alphaBlock;
    }

    /**
     * Sets the DXT2/DXT3 alpha block.
     *
     * @param alphaBlock DXT2/DXT3 alpha block.
     */
    public void setAlphaBlock(AlphaBlockDXT3 alphaBlock)
    {
        this.alphaBlock = alphaBlock;
    }

    /**
     * Returns the DXT1 color block.
     *
     * @return DXT1 color block.
     */
    public BlockDXT1 getColorBlock()
    {
        return this.colorBlock;
    }

    /**
     * Sets the DXT1 color block.
     *
     * @param colorBlock DXT1 color block.
     */
    public void setColorBlock(BlockDXT1 colorBlock)
    {
        this.colorBlock = colorBlock;
    }
}