Examples of java.nio.Buffer

java.nio.Buffer
A buffer is a list of elements of a specific primitive type.
A buffer can be described by following properties:
- Capacity, is the number of elements a buffer can hold. Capacity is no less than zero and never changes.
- Posotion, is a cursor of this buffer. Elements are read or write at the position if you do not specify an index explicitly. Position is no less than zero and no greater than the limit.
- Limit controls the scope of accessible elements. You can only read or write elements from index zero to limit - 1. Accessing elements out of the scope will cause exception. Limit is no less than zero and no greater than capacity.
- Mark, is used to remember the current position, so that you can reset the position later. Mark is no less than zero and no greater than position.
- A buffer can be readonly or read-write. Trying to modify the elements of a readonly buffer will cause ReadOnlyBufferException, while changing the position, limit and mark of a readonly buffer is OK.
- A buffer can be direct or indirect. A direct buffer will try its best to take advantage of native memory APIs and it may not stay in java heap, thus not affected by GC.
Buffers are not thread-safe. If concurrent access to a buffer instance is required, then the callers are responsible to take care of the synchronization issues.


    public Mesh createMesh(Vector3f scale, Vector2f tcScale, Vector2f tcOffset, float offsetAmount, int totalSize, boolean center, int lod, boolean rightLod, boolean topLod, boolean leftLod, boolean bottomLod) {
        FloatBuffer pb = writeVertexArray(null, scale, center);
        FloatBuffer texb = writeTexCoordArray(null, tcOffset, tcScale, offsetAmount, totalSize);
        FloatBuffer nb = writeNormalArray(null, scale);
        Buffer ib;
        IndexBuffer idxB = writeIndexArrayLodDiff(lod, rightLod, topLod, leftLod, bottomLod, totalSize);
        if (idxB.getBuffer() instanceof IntBuffer)
            ib = (IntBuffer)idxB.getBuffer();
        else
            ib = (ShortBuffer)idxB.getBuffer();

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        for (int i = 0; i < compsForBuf.length; i++) {
            if (compsForBuf[i] == 0) {
                continue;
            }


            Buffer data;
            if (i == Type.Index.ordinal()) {
                data = VertexBuffer.createBuffer(formatForBuf[i], compsForBuf[i], totalTris);
            } else {
                data = VertexBuffer.createBuffer(formatForBuf[i], compsForBuf[i], totalVerts);
            }

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                }
            }


            if (geometry.getMesh().getMode() == Mode.Triangles) {// there is no need to flip the indexes for lines and points
                LOGGER.finer("Flipping index order in triangle mesh.");
                Buffer indexBuffer = geometry.getMesh().getBuffer(Type.Index).getData();
                for (int i = 0; i < indexBuffer.limit(); i += 3) {
                    if (indexBuffer instanceof ShortBuffer) {
                        short index = ((ShortBuffer) indexBuffer).get(i + 1);
                        ((ShortBuffer) indexBuffer).put(i + 1, ((ShortBuffer) indexBuffer).get(i + 2));
                        ((ShortBuffer) indexBuffer).put(i + 2, index);
                    } else {

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    public void generateLodEntropies() {
        float[] entropies = new float[getMaxLod()+1];
        for (int i = 0; i <= getMaxLod(); i++){
            int curLod = (int) Math.pow(2, i);
            IndexBuffer idxB = geomap.writeIndexArrayLodDiff(curLod, false, false, false, false, totalSize);
            Buffer ib;
            if (idxB.getBuffer() instanceof IntBuffer)
                ib = (IntBuffer)idxB.getBuffer();
            else
                ib = (ShortBuffer)idxB.getBuffer();
            entropies[i] = EntropyComputeUtil.computeLodEntropy(mesh, ib);

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            if (useVariableLod)
                idxB = geomap.writeIndexArrayLodVariable(pow, (int) Math.pow(2, utp.getRightLod()), (int) Math.pow(2, utp.getTopLod()), (int) Math.pow(2, utp.getLeftLod()), (int) Math.pow(2, utp.getBottomLod()), totalSize);
            else
                idxB = geomap.writeIndexArrayLodDiff(pow, right, top, left, bottom, totalSize);
            
            Buffer b;
            if (idxB.getBuffer() instanceof IntBuffer)
                b = (IntBuffer)idxB.getBuffer();
            else
                b = (ShortBuffer)idxB.getBuffer();
            utp.setNewIndexBuffer(b);

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        bs.dbuffer = ((ByteBuffer)bs.buffer).asDoubleBuffer();
        bs.write();
    }
    public void testBufferFieldReadUnchanged() {
        BufferStructure bs = new BufferStructure();
        Buffer b = ByteBuffer.allocateDirect(16);
        bs.buffer = b;
        bs.dbuffer = ((ByteBuffer)bs.buffer).asDoubleBuffer();
        bs.write();
        bs.read();
        assertEquals("Buffer field should be unchanged", b, bs.buffer);

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    }


    /* get the pointer to an extension array from indexes[index] */
    static Buffer ARRAY(ByteBuffer indexes, int index, Class itemType) {
        int oldpos = indexes.position();
        Buffer b;


        indexes.position(indexes.getInt(index << 2));
        if (itemType == int.class)
            b = indexes.asIntBuffer();
        else if (itemType == char.class)

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/* 112 */     return this;
/*     */   }
/*     */ 
/*     */   public static int getBufferType(J3DBuffer b)
/*     */   {
/* 126 */     Buffer buffer = b.getBuffer();
/*     */     int bufferType;
/*     */     int bufferType;
/* 128 */     if (buffer == null) {
/* 129 */       bufferType = 0;
/*     */     }

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        if (vboID != 0) {
            updateVBO(data, rendRecord, vboID, 0);
            return vboID;
        }


        final Buffer dataBuffer = data.getBuffer();
        if (dataBuffer != null) {
            // XXX: should we be rewinding? Maybe make that the programmer's responsibility.
            dataBuffer.rewind();
            vboID = makeVBOId();
            data.setVBOID(context.getGlContextRep(), vboID);


            rendRecord.invalidateVBO();
            JoglRendererUtil.setBoundVBO(rendRecord, vboID);
            gl.glBufferData(GL.GL_ARRAY_BUFFER, dataBuffer.limit() * data.getByteCount(), dataBuffer,
                    getGLVBOAccessMode(data.getVboAccessMode()));
        } else {
            throw new Ardor3dException("Attempting to create a vbo id for an AbstractBufferData with no Buffer value.");
        }
        return vboID;

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    private static void updateVBO(final AbstractBufferData<? extends Buffer> data, final RendererRecord rendRecord,
            final int vboID, final int offsetBytes) {
        if (data.isNeedsRefresh()) {
            final GL gl = GLContext.getCurrentGL();
            final Buffer dataBuffer = data.getBuffer();
            dataBuffer.rewind();
            JoglRendererUtil.setBoundVBO(rendRecord, vboID);
            gl.glBufferSubData(GL.GL_ARRAY_BUFFER, offsetBytes, dataBuffer.limit() * data.getByteCount(), dataBuffer);
            data.setNeedsRefresh(false);
        }
    }

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