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 void fastChannelCopy(final ReadableByteChannel src, final WritableByteChannel dest)
        throws IOException {
    final ByteBuffer buffer = ByteBuffer.allocateDirect(16 * 1024);
    while (src.read(buffer) != -1) {
        // prepare the buffer to be drained
        buffer.flip();//from www.j  a  v a  2 s. c o m
        // write to the channel, may block
        dest.write(buffer);
        // If partial transfer, shift remainder down
        // If buffer is empty, same as doing recycle()
        buffer.compact();
    }
    // EOF will leave buffer in fill state
    buffer.flip();
    // make sure the buffer is fully drained.
    while (buffer.hasRemaining()) {
        dest.write(buffer);
    }
}

From source file:Main.java

/**
 * Creates a {@link FloatBuffer} based on the given data.
 *
 * @param data the data for the buffer//ww  w .ja v  a2 s.c  o m
 * @return the float buffer
 */
public static FloatBuffer createFloatBuffer(final float[] data) {
    ByteBuffer bbVertices = ByteBuffer.allocateDirect(data.length * 4);
    bbVertices.order(ByteOrder.nativeOrder());
    final FloatBuffer fBuffer = bbVertices.asFloatBuffer();
    fBuffer.put(data);
    fBuffer.position(0);
    return fBuffer;
}

From source file:Main.java

/**
 * Allocates a FloatBuffer with the given length.
 * //from   w w w.  java  2  s  . c  o  m
 * @param length The length of the buffer to allocate (in elements, not bytes!).
 * @return The newly allocated buffer.
 */
public static FloatBuffer allocateFloatBuffer(int length) {
    return ByteBuffer.allocateDirect(length * 4) // float == 4 bytes
            .order(ByteOrder.nativeOrder()).asFloatBuffer();
}

From source file:Main.java

/**
 * Allocates a ShortBuffer with the given length.
 *
 * @param length The length of the buffer to allocate (in elements, not bytes!).
 * @return The newly allocated buffer.//from www  . j  a va 2  s . c  o  m
 */
public static ShortBuffer allocateShortBuffer(int length) {
    return ByteBuffer.allocateDirect(length * 2) // short == 2 bytes
            .order(ByteOrder.nativeOrder()).asShortBuffer();
}

From source file:Main.java

/**
 * Creates a {@link ShortBuffer} based on the given data.
 *
 * @param data the data for the buffer/*w w w  .  j av  a2s . com*/
 * @return the short buffer
 */
public static ShortBuffer createShortBuffer(final short[] data) {
    if (data == null) {
        return null;
    }
    ByteBuffer bbVertices = ByteBuffer.allocateDirect(data.length * 4);
    bbVertices.order(ByteOrder.nativeOrder());
    final ShortBuffer fBuffer = bbVertices.asShortBuffer();
    fBuffer.put(data);
    fBuffer.position(0);
    return fBuffer;
}

From source file:Main.java

public static FloatBuffer makeFloatBuffer(float[] i_arr) {
    ByteBuffer bb = ByteBuffer.allocateDirect(i_arr.length * 4);
    bb.order(ByteOrder.nativeOrder());
    FloatBuffer fb = bb.asFloatBuffer();
    fb.put(i_arr);//w w w  . j  av a  2 s  . c  o  m
    fb.position(0);
    return fb;
}

From source file:Main.java

public static FloatBuffer makeBuffer(float[] data) {
    ByteBuffer b = ByteBuffer.allocateDirect(data.length * 4);
    b.order(ByteOrder.nativeOrder());
    FloatBuffer buffer = b.asFloatBuffer();
    buffer.put(data);//ww w . j  a va2 s  .  c  o m
    buffer.position(0);
    return buffer;
}

From source file:Main.java

private static final FloatBuffer createDebugColors(int drawMode, int size) {
    ByteBuffer bb = ByteBuffer.allocateDirect(size * 4 * 4);
    bb.order(ByteOrder.nativeOrder());
    FloatBuffer colors = bb.asFloatBuffer();
    if (drawMode == GL10.GL_TRIANGLES) {
        for (int i = 0; i < size * 4; i++) {
            colors.put(triangleColors[i % triangleColors.length]);
        }/*from   ww  w.  ja  v  a  2 s.  c  om*/
    } else {
        for (int i = 0; i < size; i++) {
            colors.put(1f);
            colors.put(0f);
            colors.put(1f);
            colors.put(1f);
        }
    }
    colors.rewind();
    return colors;
}

From source file:Main.java

public static ByteBuffer makeByteBuffer(int size) {
    ByteBuffer bb = ByteBuffer.allocateDirect(size);
    bb.position(0);
    return bb;
}

From source file:Main.java

/**
 * Creates a {@link IntBuffer} based on the given data.
 *
 * @param data the data for the buffer//  w  ww  . ja  v  a2 s .  c o m
 * @return the int buffer
 */
public static IntBuffer createIntBuffer(final float[] data) {
    final int[] tmpData = new int[data.length];
    for (int i = 0; i < tmpData.length; i++) {
        tmpData[i] = Float.floatToRawIntBits(data[i]);
    }
    final ByteBuffer bbVertices = ByteBuffer.allocateDirect(tmpData.length * 4);
    bbVertices.order(ByteOrder.nativeOrder());
    final IntBuffer intBuffer = bbVertices.asIntBuffer();
    intBuffer.put(tmpData);
    intBuffer.flip();
    return intBuffer;
}