208 lines
6.4 KiB
Java
208 lines
6.4 KiB
Java
/*
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* Copyright (c) 2002-2008 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl;
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import java.nio.Buffer;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.CharBuffer;
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import java.nio.DoubleBuffer;
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import java.nio.FloatBuffer;
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import java.nio.IntBuffer;
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import java.nio.LongBuffer;
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import java.nio.ShortBuffer;
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/**
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* Some often-used Buffer code for creating native buffers of the appropriate size.
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*
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* @author $Author$
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* @version $Revision$
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* $Id$
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*/
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public final class BufferUtils {
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@java.lang.annotation.Native
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private static final int __FORCE_NATIVE_HEADER = 0;
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/**
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* Construct a direct native-ordered bytebuffer with the specified size.
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* @param size The size, in bytes
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* @return a ByteBuffer
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*/
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public static ByteBuffer createByteBuffer(int size) {
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return ByteBuffer.allocateDirect(size).order(ByteOrder.nativeOrder());
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}
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/**
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* Construct a direct native-order shortbuffer with the specified number
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* of elements.
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* @param size The size, in shorts
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* @return a ShortBuffer
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*/
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public static ShortBuffer createShortBuffer(int size) {
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return createByteBuffer(size << 1).asShortBuffer();
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}
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/**
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* Construct a direct native-order charbuffer with the specified number
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* of elements.
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* @param size The size, in chars
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* @return an CharBuffer
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*/
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public static CharBuffer createCharBuffer(int size) {
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return createByteBuffer(size << 1).asCharBuffer();
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}
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/**
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* Construct a direct native-order intbuffer with the specified number
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* of elements.
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* @param size The size, in ints
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* @return an IntBuffer
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*/
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public static IntBuffer createIntBuffer(int size) {
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return createByteBuffer(size << 2).asIntBuffer();
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}
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/**
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* Construct a direct native-order longbuffer with the specified number
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* of elements.
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* @param size The size, in longs
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* @return an LongBuffer
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*/
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public static LongBuffer createLongBuffer(int size) {
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return createByteBuffer(size << 3).asLongBuffer();
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}
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/**
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* Construct a direct native-order floatbuffer with the specified number
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* of elements.
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* @param size The size, in floats
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* @return a FloatBuffer
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*/
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public static FloatBuffer createFloatBuffer(int size) {
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return createByteBuffer(size << 2).asFloatBuffer();
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}
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/**
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* Construct a direct native-order doublebuffer with the specified number
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* of elements.
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* @param size The size, in floats
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* @return a FloatBuffer
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*/
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public static DoubleBuffer createDoubleBuffer(int size) {
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return createByteBuffer(size << 3).asDoubleBuffer();
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}
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/**
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* Construct a PointerBuffer with the specified number
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* of elements.
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* @param size The size, in memory addresses
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* @return a PointerBuffer
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*/
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public static PointerBuffer createPointerBuffer(int size) {
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return PointerBuffer.allocateDirect(size);
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}
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/**
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* @return n, where buffer_element_size=2^n.
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*/
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public static int getElementSizeExponent(Buffer buf) {
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if (buf instanceof ByteBuffer)
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return 0;
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else if (buf instanceof ShortBuffer || buf instanceof CharBuffer)
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return 1;
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else if (buf instanceof FloatBuffer || buf instanceof IntBuffer)
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return 2;
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else if (buf instanceof LongBuffer || buf instanceof DoubleBuffer)
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return 3;
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else
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throw new IllegalStateException("Unsupported buffer type: " + buf);
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}
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/**
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* A helper function which is used to get the byte offset in an arbitrary buffer
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* based on its position
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* @return the position of the buffer, in BYTES
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*/
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public static int getOffset(Buffer buffer) {
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return buffer.position() << getElementSizeExponent(buffer);
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}
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/** Fill buffer with zeros from position to remaining */
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public static void zeroBuffer(ByteBuffer b) {
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zeroBuffer0(b, b.position(), b.remaining());
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}
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/** Fill buffer with zeros from position to remaining */
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public static void zeroBuffer(ShortBuffer b) {
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zeroBuffer0(b, b.position()*2L, b.remaining()*2L);
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}
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/** Fill buffer with zeros from position to remaining */
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public static void zeroBuffer(CharBuffer b) {
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zeroBuffer0(b, b.position()*2L, b.remaining()*2L);
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}
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/** Fill buffer with zeros from position to remaining */
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public static void zeroBuffer(IntBuffer b) {
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zeroBuffer0(b, b.position()*4L, b.remaining()*4L);
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}
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/** Fill buffer with zeros from position to remaining */
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public static void zeroBuffer(FloatBuffer b) {
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zeroBuffer0(b, b.position()*4L, b.remaining()*4L);
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}
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/** Fill buffer with zeros from position to remaining */
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public static void zeroBuffer(LongBuffer b) {
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zeroBuffer0(b, b.position()*8L, b.remaining()*8L);
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}
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/** Fill buffer with zeros from position to remaining */
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public static void zeroBuffer(DoubleBuffer b) {
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zeroBuffer0(b, b.position()*8L, b.remaining()*8L);
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}
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/** Fill buffer with zeros from position to remaining */
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private static native void zeroBuffer0(Buffer b, long off, long size);
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/**
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* Returns the memory address of the specified buffer.
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*
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* @param buffer the buffer
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*
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* @return the memory address
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*/
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static native long getBufferAddress(Buffer buffer);
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}
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