Example usage for java.nio ByteBuffer allocateDirect

Introduction

In this page you can find the example usage for java.nio ByteBuffer allocateDirect.

Prototype

public static ByteBuffer allocateDirect(int capacity)

Source Link

Document

Creates a direct byte buffer based on a newly allocated memory block.

Usage

From source file:Main.java

public static ShortBuffer makeShortBuffer(short[] array) {
    if (array == null)
        throw new IllegalArgumentException();

    ByteBuffer byteBuffer = ByteBuffer.allocateDirect(2 * array.length);
    byteBuffer.order(ByteOrder.nativeOrder());
    ShortBuffer shortBuffer = byteBuffer.asShortBuffer();
    shortBuffer.put(array);/*from  w  w w  . j  ava  2 s.  c o  m*/
    shortBuffer.position(0);
    return shortBuffer;
}

From source file:Main.java

public static ByteBuffer createByteBuffer(int size) {
    return ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder());
}

From source file:Main.java

public static ByteBuffer cloneByteBuffer(final ByteBuffer original) {
    // Create clone with same capacity as original.
    final ByteBuffer clone = (original.isDirect()) ? ByteBuffer.allocateDirect(original.capacity())
            : ByteBuffer.allocate(original.capacity());

    // Create a read-only copy of the original.
    // This allows reading from the original without modifying it.
    final ByteBuffer readOnlyCopy = original.asReadOnlyBuffer();

    // Flip and read from the original.
    readOnlyCopy.flip();//ww w .  ja va  2s  . c o  m
    clone.put(readOnlyCopy);
    clone.position(original.position());
    clone.limit(original.limit());
    clone.order(original.order());
    return clone;
}

From source file:Main.java

/**
 * @param size number of chars the buffer should hold
 * @return the newly allocated char buffer
 *//*from   w  w w.j  a  v  a 2 s  .  co m*/
public static CharBuffer createCharBuffer(int size) {
    ByteBuffer bb = ByteBuffer.allocateDirect(2 * size);
    bb.order(ByteOrder.nativeOrder());
    return bb.asCharBuffer();
}

From source file:Main.java

/**
 * @param pCapacity the capacity of the returned {@link FloatBuffer} in floats.
 * @return/*from  ww w. j av a  2s.  co m*/
 */
public static FloatBuffer allocateDirectFloatBuffer(final int pCapacity) {
    return ByteBuffer.allocateDirect(pCapacity * 4).order(ByteOrder.nativeOrder()).asFloatBuffer();
}

From source file:Main.java

/**
 * @param size number of floats the buffer should hold
 * @return the newly allocated float buffer
 *///from   w w w .j  a va  2s.  co m
public static FloatBuffer createFloatBuffer(int size) {
    ByteBuffer bb = ByteBuffer.allocateDirect(4 * size);
    bb.order(ByteOrder.nativeOrder());
    return bb.asFloatBuffer();
}

From source file:Main.java

/**
 * Make a direct NIO ByteBuffer from an array of floats
 * @param arr The array//ww  w. j a  v a2s  .c  o m
 * @return The newly created FloatBuffer
 */
public static ByteBuffer makeByteBuffer(byte[] arr) {
    ByteBuffer bb = ByteBuffer.allocateDirect(arr.length);
    bb.order(ByteOrder.nativeOrder());
    bb.put(arr);
    bb.position(0);
    return bb;
}

From source file:Main.java

/**
 * Make a direct NIO FloatBuffer from an array of floats
 * @param arr The array// w ww . j ava2  s.  c  o  m
 * @return The newly created FloatBuffer
 */
public static FloatBuffer makeFloatBuffer(float[] arr) {
    ByteBuffer bb = ByteBuffer.allocateDirect(arr.length * 4);
    bb.order(ByteOrder.nativeOrder());
    FloatBuffer fb = bb.asFloatBuffer();
    fb.put(arr);
    fb.position(0);
    return fb;
}

From source file:Main.java

public static Buffer fillBuffer(float[] array) {
    // Convert to floats because OpenGL doesnt work on doubles, and manually
    // casting each input value would take too much time.
    ByteBuffer bb = ByteBuffer.allocateDirect(4 * array.length); // each
    // float//from w w w . j  a  v  a  2 s  .co  m
    // takes 4
    // bytes
    bb.order(ByteOrder.LITTLE_ENDIAN);
    for (float d : array)
        bb.putFloat(d);
    bb.rewind();

    return bb;

}

From source file:Main.java

/**
 * create a Floatbuffer for a given Array
 * @param array/*from  w  w w.  j  a  v  a 2s .  c o m*/
 * @return
 */
public static FloatBuffer createFloatBuffer(float[] array) {
    final int floatSize = Float.SIZE / 8;
    ByteBuffer byteBuffer = ByteBuffer.allocateDirect(array.length * floatSize);
    byteBuffer.order(ByteOrder.nativeOrder());
    FloatBuffer floatBuffer = byteBuffer.asFloatBuffer();
    floatBuffer.put(array);
    floatBuffer.position(0);
    return floatBuffer;
}