Package org.lwjgl

Source Code of org.lwjgl.NondirectBufferWrapper$CachedBuffers

/*
* Copyright (c) 2002-2008 LWJGL Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
*   notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
*   notice, this list of conditions and the following disclaimer in the
*   documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'LWJGL' nor the names of
*   its contributors may be used to endorse or promote products derived
*   from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.lwjgl;

import java.nio.ByteBuffer;
import java.nio.ShortBuffer;
import java.nio.IntBuffer;
import java.nio.FloatBuffer;
import java.nio.LongBuffer;
import java.nio.DoubleBuffer;
import java.nio.ByteOrder;

/**
* Utility class to cache thread local direct buffers so when we are passed a non-direct buffer,
* we can put its contents into a cached direct buffer and use that at the native side instead.
*
* Internal class, don't use.
* @author elias_naur <elias_naur@users.sourceforge.net>
* @version $Revision: 2762 $
* $Id: BufferChecks.java 2762 2007-04-11 16:13:05Z elias_naur $
*/
public final class NondirectBufferWrapper {
  private static final int INITIAL_BUFFER_SIZE = 1;

  private static final ThreadLocal<CachedBuffers> thread_buffer = new ThreadLocal<CachedBuffers>() {
    protected CachedBuffers initialValue() {
      return new CachedBuffers(INITIAL_BUFFER_SIZE);
    }
  };

  private static CachedBuffers getCachedBuffers(int minimum_byte_size) {
    CachedBuffers buffers = thread_buffer.get();
    int current_byte_size = buffers.byte_buffer.capacity();
    if (minimum_byte_size > current_byte_size) {
      buffers = new CachedBuffers(minimum_byte_size);
      thread_buffer.set(buffers);
    }
    return buffers;
  }

  public static ByteBuffer wrapNoCopyBuffer(ByteBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapNoCopyDirect(buf);
  }

  public static ShortBuffer wrapNoCopyBuffer(ShortBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapNoCopyDirect(buf);
  }

  public static IntBuffer wrapNoCopyBuffer(IntBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapNoCopyDirect(buf);
  }

  public static LongBuffer wrapNoCopyBuffer(LongBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapNoCopyDirect(buf);
  }

  public static FloatBuffer wrapNoCopyBuffer(FloatBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapNoCopyDirect(buf);
  }

  public static DoubleBuffer wrapNoCopyBuffer(DoubleBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapNoCopyDirect(buf);
  }

  public static ByteBuffer wrapBuffer(ByteBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapDirect(buf);
  }

  public static ShortBuffer wrapBuffer(ShortBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapDirect(buf);
  }

  public static IntBuffer wrapBuffer(IntBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapDirect(buf);
  }

  public static LongBuffer wrapBuffer(LongBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapDirect(buf);
  }

  public static FloatBuffer wrapBuffer(FloatBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapDirect(buf);
  }

  public static DoubleBuffer wrapBuffer(DoubleBuffer buf, int size) {
    BufferChecks.checkBufferSize(buf, size);
    return wrapDirect(buf);
  }

  public static ByteBuffer wrapDirect(ByteBuffer buffer) {
    if (!buffer.isDirect())
      return doWrap(buffer);
    return buffer;
  }

  public static ShortBuffer wrapDirect(ShortBuffer buffer) {
    if (!buffer.isDirect())
      return doWrap(buffer);
    return buffer;
  }

  public static FloatBuffer wrapDirect(FloatBuffer buffer) {
    if (!buffer.isDirect())
      return doWrap(buffer);
    return buffer;
  }

  public static IntBuffer wrapDirect(IntBuffer buffer) {
    if (!buffer.isDirect())
      return doWrap(buffer);
    return buffer;
  }

  public static LongBuffer wrapDirect(LongBuffer buffer) {
    if (!buffer.isDirect())
      return doWrap(buffer);
    return buffer;
  }

  public static DoubleBuffer wrapDirect(DoubleBuffer buffer) {
    if (!buffer.isDirect())
      return doWrap(buffer);
    return buffer;
  }

  public static ByteBuffer wrapNoCopyDirect(ByteBuffer buffer) {
    if (!buffer.isDirect())
      return doNoCopyWrap(buffer);
    return buffer;
  }

  public static ShortBuffer wrapNoCopyDirect(ShortBuffer buffer) {
    if (!buffer.isDirect())
      return doNoCopyWrap(buffer);
    return buffer;
  }

  public static FloatBuffer wrapNoCopyDirect(FloatBuffer buffer) {
    if (!buffer.isDirect())
      return doNoCopyWrap(buffer);
    return buffer;
  }

  public static IntBuffer wrapNoCopyDirect(IntBuffer buffer) {
    if (!buffer.isDirect())
      return doNoCopyWrap(buffer);
    return buffer;
  }

  public static LongBuffer wrapNoCopyDirect(LongBuffer buffer) {
    if (!buffer.isDirect())
      return doNoCopyWrap(buffer);
    return buffer;
  }

  public static DoubleBuffer wrapNoCopyDirect(DoubleBuffer buffer) {
    if (!buffer.isDirect())
      return doNoCopyWrap(buffer);
    return buffer;
  }

  public static void copy(ByteBuffer src, ByteBuffer dst) {
    if (dst != null && !dst.isDirect()) {
      int saved_position = dst.position();
      dst.put(src);
      dst.position(saved_position);
    }
  }

  public static void copy(ShortBuffer src, ShortBuffer dst) {
    if (dst != null && !dst.isDirect()) {
      int saved_position = dst.position();
      dst.put(src);
      dst.position(saved_position);
    }
  }

  public static void copy(IntBuffer src, IntBuffer dst) {
    if (dst != null && !dst.isDirect()) {
      int saved_position = dst.position();
      dst.put(src);
      dst.position(saved_position);
    }
  }

  public static void copy(FloatBuffer src, FloatBuffer dst) {
    if (dst != null && !dst.isDirect()) {
      int saved_position = dst.position();
      dst.put(src);
      dst.position(saved_position);
    }
  }

  public static void copy(LongBuffer src, LongBuffer dst) {
    if (dst != null && !dst.isDirect()) {
      int saved_position = dst.position();
      dst.put(src);
      dst.position(saved_position);
    }
  }

  public static void copy(DoubleBuffer src, DoubleBuffer dst) {
    if (dst != null && !dst.isDirect()) {
      int saved_position = dst.position();
      dst.put(src);
      dst.position(saved_position);
    }
  }

  private static ByteBuffer doNoCopyWrap(ByteBuffer buffer) {
    ByteBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.limit(buffer.limit());
    direct_buffer.position(buffer.position());
    return direct_buffer;
  }

  private static ShortBuffer doNoCopyWrap(ShortBuffer buffer) {
    ShortBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.limit(buffer.limit());
    direct_buffer.position(buffer.position());
    return direct_buffer;
  }

  private static IntBuffer doNoCopyWrap(IntBuffer buffer) {
    IntBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.limit(buffer.limit());
    direct_buffer.position(buffer.position());
    return direct_buffer;
  }

  private static FloatBuffer doNoCopyWrap(FloatBuffer buffer) {
    FloatBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.limit(buffer.limit());
    direct_buffer.position(buffer.position());
    return direct_buffer;
  }

  private static LongBuffer doNoCopyWrap(LongBuffer buffer) {
    LongBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.limit(buffer.limit());
    direct_buffer.position(buffer.position());
    return direct_buffer;
  }

  private static DoubleBuffer doNoCopyWrap(DoubleBuffer buffer) {
    DoubleBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.limit(buffer.limit());
    direct_buffer.position(buffer.position());
    return direct_buffer;
  }

  private static ByteBuffer lookupBuffer(ByteBuffer buffer) {
    return getCachedBuffers(buffer.remaining()).byte_buffer;
  }

  private static ByteBuffer doWrap(ByteBuffer buffer) {
    ByteBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.clear();
    int saved_position = buffer.position();
    direct_buffer.put(buffer);
    buffer.position(saved_position);
    direct_buffer.flip();
    return direct_buffer;
  }

  private static ShortBuffer lookupBuffer(ShortBuffer buffer) {
    CachedBuffers buffers = getCachedBuffers(buffer.remaining()*2);
    return buffer.order() == ByteOrder.LITTLE_ENDIAN ? buffers.short_buffer_little : buffers.short_buffer_big;
  }

  private static ShortBuffer doWrap(ShortBuffer buffer) {
    ShortBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.clear();
    int saved_position = buffer.position();
    direct_buffer.put(buffer);
    buffer.position(saved_position);
    direct_buffer.flip();
    return direct_buffer;
  }

  private static FloatBuffer lookupBuffer(FloatBuffer buffer) {
    CachedBuffers buffers = getCachedBuffers(buffer.remaining()*4);
    return buffer.order() == ByteOrder.LITTLE_ENDIAN ? buffers.float_buffer_little : buffers.float_buffer_big;
  }

  private static FloatBuffer doWrap(FloatBuffer buffer) {
    FloatBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.clear();
    int saved_position = buffer.position();
    direct_buffer.put(buffer);
    buffer.position(saved_position);
    direct_buffer.flip();
    return direct_buffer;
  }

  private static IntBuffer lookupBuffer(IntBuffer buffer) {
    CachedBuffers buffers = getCachedBuffers(buffer.remaining()*4);
    return buffer.order() == ByteOrder.LITTLE_ENDIAN ? buffers.int_buffer_little : buffers.int_buffer_big;
  }

  private static IntBuffer doWrap(IntBuffer buffer) {
    IntBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.clear();
    int saved_position = buffer.position();
    direct_buffer.put(buffer);
    buffer.position(saved_position);
    direct_buffer.flip();
    return direct_buffer;
  }

  private static LongBuffer lookupBuffer(LongBuffer buffer) {
    CachedBuffers buffers = getCachedBuffers(buffer.remaining()*8);
    return buffer.order() == ByteOrder.LITTLE_ENDIAN ? buffers.long_buffer_little : buffers.long_buffer_big;
  }

  private static LongBuffer doWrap(LongBuffer buffer) {
    LongBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.clear();
    int saved_position = buffer.position();
    direct_buffer.put(buffer);
    buffer.position(saved_position);
    direct_buffer.flip();
    return direct_buffer;
  }

  private static DoubleBuffer lookupBuffer(DoubleBuffer buffer) {
    CachedBuffers buffers = getCachedBuffers(buffer.remaining()*8);
    return buffer.order() == ByteOrder.LITTLE_ENDIAN ? buffers.double_buffer_little : buffers.double_buffer_big;
  }

  private static DoubleBuffer doWrap(DoubleBuffer buffer) {
    DoubleBuffer direct_buffer = lookupBuffer(buffer);
    direct_buffer.clear();
    int saved_position = buffer.position();
    direct_buffer.put(buffer);
    buffer.position(saved_position);
    direct_buffer.flip();
    return direct_buffer;
  }

  private static final class CachedBuffers {
    private final ByteBuffer byte_buffer;
    private final ShortBuffer short_buffer_big;
    private final IntBuffer int_buffer_big;
    private final FloatBuffer float_buffer_big;
    private final LongBuffer long_buffer_big;
    private final DoubleBuffer double_buffer_big;
    private final ShortBuffer short_buffer_little;
    private final IntBuffer int_buffer_little;
    private final FloatBuffer float_buffer_little;
    private final LongBuffer long_buffer_little;
    private final DoubleBuffer double_buffer_little;

    private CachedBuffers(int size) {
      this.byte_buffer = ByteBuffer.allocateDirect(size);
      this.short_buffer_big = byte_buffer.asShortBuffer();
      this.int_buffer_big = byte_buffer.asIntBuffer();
      this.float_buffer_big = byte_buffer.asFloatBuffer();
      this.long_buffer_big = byte_buffer.asLongBuffer();
      this.double_buffer_big = byte_buffer.asDoubleBuffer();
      this.byte_buffer.order(ByteOrder.LITTLE_ENDIAN);
      this.short_buffer_little = byte_buffer.asShortBuffer();
      this.int_buffer_little = byte_buffer.asIntBuffer();
      this.float_buffer_little = byte_buffer.asFloatBuffer();
      this.long_buffer_little = byte_buffer.asLongBuffer();
      this.double_buffer_little = byte_buffer.asDoubleBuffer();
    }
  }
}
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