Java Code Examples for com.jme3.math.FastMath#isPowerOfTwo()

protected TerrainQuad(String name, int patchSize, int quadSize,
                        Vector3f scale, float[] heightMap, int totalSize,
                        Vector2f offset, float offsetAmount)
{
    super(name);

    if (heightMap == null)
        heightMap = generateDefaultHeightMap(quadSize);

    if (!FastMath.isPowerOfTwo(quadSize - 1)) {
        throw new RuntimeException("size given: " + quadSize + "  Terrain quad sizes may only be (2^N + 1)");
    }
    if (FastMath.sqrt(heightMap.length) > quadSize) {
        Logger.getLogger(this.getClass().getName()).log(Level.WARNING, "Heightmap size is larger than the terrain size. Make sure your heightmap image is the same size as the terrain!");
    }

    this.offset = offset;
    this.offsetAmount = offsetAmount;
    this.totalSize = totalSize;
    this.size = quadSize;
    this.patchSize = patchSize;
    this.stepScale = scale;
    split(patchSize, heightMap);
}
 

protected TerrainQuad(String name, int patchSize, int quadSize,
                        Vector3f scale, float[] heightMap, int totalSize,
                        Vector2f offset, float offsetAmount)
{
    super(name);
    
    if (heightMap == null)
        heightMap = generateDefaultHeightMap(quadSize);
    
    if (!FastMath.isPowerOfTwo(quadSize - 1)) {
        throw new RuntimeException("size given: " + quadSize + "  Terrain quad sizes may only be (2^N + 1)");
    }
    if (FastMath.sqrt(heightMap.length) > quadSize) {
        Logger.getLogger(this.getClass().getName()).log(Level.WARNING, "Heightmap size is larger than the terrain size. Make sure your heightmap image is the same size as the terrain!");
    }
    
    this.offset = offset;
    this.offsetAmount = offsetAmount;
    this.totalSize = totalSize;
    this.size = quadSize;
    this.patchSize = patchSize;
    this.stepScale = scale;
    split(patchSize, heightMap);
}
 

/**
     * <code>uploadTextureBitmap</code> uploads a native android bitmap
     * @param target
     * @param bitmap
     * @param generateMips
     * @param powerOf2
     */
    private static void uploadTextureBitmap2(final int target, Bitmap bitmap, boolean generateMips, boolean powerOf2)
    {
        if (bitmap.isRecycled()) {
            throw new RuntimeException("bitmap is recycled.");
        }
        if (!powerOf2)
        {
            int width = bitmap.getWidth();
            int height = bitmap.getHeight();
            if (!FastMath.isPowerOfTwo(width) || !FastMath.isPowerOfTwo(height)
                    /*|| width >= 512 || height >= 512*/)
            {
                // scale to power of two
                width = FastMath.nearestPowerOfTwo(width);
                height = FastMath.nearestPowerOfTwo(height);
//                while(width >= 512) {
//                    width = width / 2;
//                }
//                while(height >= 512) {
//                    height = height / 2;
//                }
            Logger.getLogger(TextureUtil.class.getName()).warning("texture size changed.");
                Bitmap bitmap2 = Bitmap.createScaledBitmap(bitmap, width, height, true);
                bitmap.recycle();
                bitmap = bitmap2;
            }
        }

        if (generateMips)
        {
            buildMipmap(bitmap);
        }
        else
        {
            GLUtils.texImage2D(target, 0, bitmap, 0);
//checkGLError();
//bitmap.recycle();
        }
    }
 

/**
 * The constructor generates the heightmap. After the first 4 corners are
 * randomly given a height, the center will be heighted to the average of
 * the 4 corners to which a random value is added. Then other passes fill
 * the heightmap by the same principle.
 * The random value is generated between the values <code>-range</code>
 * and <code>range</code>. The <code>range</code> parameter is multiplied by
 * the <code>persistence</code> parameter each pass to smoothen close cell heights.
 * Extends this class and override the getOffset function for more control of
 * the randomness (you can use the coordinates and/or the computed average height
 * to influence the random amount added.
 *
 * @param size
 *          The size of the heightmap, must be 2^N+1
 * @param range
 *          The range in which randomness will be added. A value of 1 will
 *          allow -1 to 1 value changes.
 * @param persistence
 *          The factor by which the range will evolve at each iteration.
 *          A value of 0.5f will halve the range at each iteration and is
 *          typically a good choice
 * @param seed
 *          A seed to feed the random number generator.
 * @throws IllegalArgumentException if size is not a power of two plus one.
 */
public MidpointDisplacementHeightMap(int size, float range, float persistence, long seed) {
    if (size < 0 || !FastMath.isPowerOfTwo(size - 1)) {
        throw new IllegalArgumentException("The size is negative or not of the form 2^N +1"
                + " (a power of two plus one)");
    }
    this.size = size;
    this.range = range;
    this.persistence = persistence;
    this.seed = seed;
    load();
}
 

/**
 * The constructor generates the heightmap. After the first 4 corners are
 * randomly given an height, the center will be heighted to the average of
 * the 4 corners to which a random value is added. Then other passes fill
 * the heightmap by the same principle.
 * The random value is generated between the values <code>-range</code>
 * and <code>range</code>. The <code>range</code> parameter is multiplied by
 * the <code>persistence</code> parameter each pass to smoothen close cell heights.
 * Extends this class and override the getOffset function for more control of
 * the randomness (you can use the coordinates and/or the computed average height
 * to influence the random amount added.
 *
 * @param size
 *          The size of the heightmap, must be 2^N+1
 * @param range
 *          The range in which randomness will be added. A value of 1 will
 *          allow -1 to 1 value changes.
 * @param persistence
 *          The factor by which the range will evolve at each iteration.
 *          A value of 0.5f will halve the range at each iteration and is
 *          typically a good choice
 * @param seed
 *          A seed to feed the random number generator.
 * @throw JMException if size is not a power of two plus one.
 */
public MidpointDisplacementHeightMap(int size, float range, float persistence, long seed) throws Exception {
    if (size < 0 || !FastMath.isPowerOfTwo(size - 1)) {
        throw new JMException("The size is negative or not of the form 2^N +1"
                + " (a power of two plus one)");
    }
    this.size = size;
    this.range = range;
    this.persistence = persistence;
    this.seed = seed;
    load();
}
 

/**
 * Determine if the image is NPOT.
 *
 * @return if the image is a non-power-of-2 image, e.g. having dimensions
 * that are not powers of 2.
 */
public boolean isNPOT() {
    return width != 0 && height != 0
            && (!FastMath.isPowerOfTwo(width) || !FastMath.isPowerOfTwo(height));
}
 

/**
 * Determine if the image is NPOT.
 *
 * @return if the image is a non-power-of-2 image, e.g. having dimensions
 * that are not powers of 2.
 */
public boolean isNPOT() {
    return width != 0 && height != 0
            && (!FastMath.isPowerOfTwo(width) || !FastMath.isPowerOfTwo(height));
}