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Lighweight Java Game Library
/*
* Copyright (c) 2002-2011 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.util.mapped;
import org.lwjgl.LWJGLUtil;
import org.lwjgl.MemoryUtil;
import java.nio.BufferOverflowException;
import java.nio.ByteBuffer;
/**
* Base superclass of all mapped objects. Classes that require
* data mapping should extend this class and registered with
* {@link MappedObjectTransformer#register(Class)}.
*
* Subclasses may only specify the default constructor. Any code
* inside that constructor is optional, but will not run when the
* view is instantiated, see {@link #runViewConstructor()}.
*
* Bounds checking may be enabled through a JVM system property: org.lwjgl.util.mapped.Checks=true
*
* @author Riven
*/
public abstract class MappedObject {
static final boolean CHECKS = LWJGLUtil.getPrivilegedBoolean("org.lwjgl.util.mapped.Checks");
protected MappedObject() {
//
}
/** The mapped object base memory address, in bytes. Read-only. */
public long baseAddress;
/** The mapped object view memory address, in bytes. Read-only. */
public long viewAddress;
/** The mapped buffer. */
ByteBuffer preventGC;
/**
* Holds the value of sizeof of the sub-type of this MappedObject
*
* The behavior of this (transformed) method does not follow the normal Java behavior.
* Vec2.SIZEOF will yield 8 (2 floats)
* Vec3.SIZEOF will yield 12 (3 floats)
* This (required) notation might cause compiler warnings, which can be suppressed with @SuppressWarnings("static-access").
* Using Java 5.0's static-import on this method will break functionality.
*/
public static int SIZEOF = -1; // any method that calls these field will have its call-site modified ('final' per subtype)
/**
* The mapped object view offset, in elements. Read/write.
* This is a virtual field, used as a convenient getter/setter for {@see viewAddress}.
*/
public int view;
protected final long getViewAddress(final int view) {
// No call-site modification for this, we override in every subclass instead,
// so that we can use it in MappedForeach.
throw new InternalError("type not registered");
}
public final void setViewAddress(final long address) {
if ( CHECKS )
checkAddress(address);
this.viewAddress = address;
}
final void checkAddress(final long address) {
final long base = MemoryUtil.getAddress0(preventGC);
final int offset = (int)(address - base);
if ( address < base || preventGC.capacity() < (offset + getSizeof()) )
throw new IndexOutOfBoundsException(Integer.toString(offset / getSizeof()));
}
final void checkRange(final int bytes) {
if ( bytes < 0 )
throw new IllegalArgumentException();
if ( preventGC.capacity() < (viewAddress - MemoryUtil.getAddress0(preventGC) + bytes) )
throw new BufferOverflowException();
}
/** The mapped object memory alignment, in bytes. Read-only. */
/**
* Returns the mapped object memory alignment, in bytes.
*
* @return the memory alignment
*/
public final int getAlign() {
// No call-site modification for this, we override in every subclass instead.
throw new InternalError("type not registered");
}
/**
* Returns the mapped object memory sizeof, in bytes.
*
* @return the sizeof value
*/
public final int getSizeof() {
// No call-site modification for this, we override in every subclass instead.
throw new InternalError("type not registered");
}
/**
* Returns the number of mapped objects that fit in the mapped buffer.
*
* @return the mapped object capacity
*/
public final int capacity() {
// No call-site modification for this, we override in every subclass instead.
throw new InternalError("type not registered");
}
/**
* Creates a MappedObject instance, mapping the memory region of the specified direct ByteBuffer.
*
* The behavior of this (transformed) method does not follow the normal Java behavior.
* Vec2.map(buffer) will return a mapped Vec2 instance.
* Vec3.map(buffer) will return a mapped Vec3 instance.
* This (required) notation might cause compiler warnings, which can be suppressed with @SuppressWarnings("static-access").
* Using Java 5.0's static-import on this method will break functionality.
*/
@SuppressWarnings("unused")
public static T map(ByteBuffer bb) {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/**
* Creates a MappedObject instance, mapping the memory region specified. This is useful for mapping
* arbitrary regions in memory, e.g. OpenCL CLMem objects, without creating a ByteBuffer first.
*
* The behavior of this (transformed) method does not follow the normal Java behavior.
* Vec2.map(buffer) will return a mapped Vec2 instance.
* Vec3.map(buffer) will return a mapped Vec3 instance.
* This (required) notation might cause compiler warnings, which can be suppressed with @SuppressWarnings("static-access").
* Using Java 5.0's static-import on this method will break functionality.
*/
@SuppressWarnings("unused")
public static T map(long address, int capacity) {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/**
* Creates a MappedObject instance, mapping the memory region of an allocated direct ByteBuffer with a capacity of elementCount*SIZEOF
*
* The behavior of this (transformed) method does not follow the normal Java behavior.
* Vec2.malloc(int) will return a mapped Vec2 instance.
* Vec3.malloc(int) will return a mapped Vec3 instance.
* This (required) notation might cause compiler warnings, which can be suppressed with @SuppressWarnings("static-access").
* Using Java 5.0's static-import on this method will break functionality.
*/
@SuppressWarnings("unused")
public static T malloc(int elementCount) {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/**
* Creates an identical new MappedObject instance, comparable to the
* contract of {@link java.nio.ByteBuffer#duplicate}. This is useful when more than one
* views of the mapped object are required at the same time, e.g. in
* multithreaded access.
*/
public final T dup() {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/**
* Creates a new MappedObject instance, with a base offset equal to
* the offset of the current view, comparable to the contract of {@link java.nio.ByteBuffer#slice}.
*/
public final T slice() {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/**
* Any code in the default constructor will not run automatically. This method
* can be used to execute that code on the current view.
*/
public final void runViewConstructor() {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/** Moves the current view to the next element. */
public final void next() {
// No call-site modification for this, we override in every subclass instead,
// so that we can use it in MappedSetX.
throw new InternalError("type not registered");
}
/**
* Copies and amount of SIZEOF - padding bytes, from the current
* mapped object, to the specified mapped object.
*/
@SuppressWarnings("unused")
public final void copyTo(T target) {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/**
* Copies and amount of SIZEOF * instances bytes, from the
* current mapped object, to the specified mapped object. Note that
* this includes any padding bytes that are part of SIZEOF.
*/
@SuppressWarnings("unused")
public final void copyRange(T target, int instances) {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/**
* Creates an {@link Iterable} that will step through
* capacity() views, leaving the view at
* the last valid value.
*
* For convenience you are encouraged to static-import this specific method:
* import static org.lwjgl.util.mapped.MappedObject.foreach;
*/
public static Iterable foreach(T mapped) {
return foreach(mapped, mapped.capacity());
}
/**
* Creates an {@link Iterable} that will step through
* elementCount views, leaving the view at
* the last valid value.
*
* For convenience you are encouraged to static-import this specific method:
* import static org.lwjgl.util.mapped.MappedObject.foreach;
*/
public static Iterable foreach(T mapped, int elementCount) {
return new MappedForeach(mapped, elementCount);
}
@SuppressWarnings("unused")
public final T[] asArray() {
// any method that calls this method will have its call-site modified
throw new InternalError("type not registered");
}
/**
* Returns the {@link java.nio.ByteBuffer} that backs this mapped object.
*
* @return the backing buffer
*/
public final ByteBuffer backingByteBuffer() {
return this.preventGC;
}
}