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/*
* Copyright 1996-2008 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
package javax.media.j3d;
/**
* The compressed geometry object is used to store geometry in a
* compressed format. Using compressed geometry may increase the speed
* objects can be sent over the network. Note that the geometry will
* be decompressed in memory, so the application will not see any
* memory savings.
*
* Compressed geometry may be passed to this CompressedGeometry object
* in one of two ways: by copying the data into this object using the
* existing constructor, or by passing a reference to the data.
*
*
* -
* By Copying:
* The existing CompressedGeometry constructor copies the buffer of
* compressed geometry data into this CompressedGeometry object. This
* is appropriate for many applications, and allows Java 3D to verify
* the data once and then not worry about it again.
*
* - By Reference:
* A new constructor and set of methods in Java 3D version 1.2 allows
* compressed geometry data to be accessed by reference, directly from
* the user's array. To use this feature, you need to construct a
* CompressedGeometry object with the
byReference flag
* set to true. In this mode, a reference to the input
* data is saved, but the data itself is not necessarily copied. Note
* that the compressed geometry header is still copied into this
* compressed geometry object. Data referenced by a
* CompressedGeometry object must not be modified after the
* CompressedGeometry object is constructed.
* Applications
* must exercise care not to violate this rule. If any referenced
* compressed geometry data is modified after construction,
* the results are undefined.
*
*
*
* @deprecated As of Java 3D version 1.4.
*/
public class CompressedGeometry extends Geometry {
CompressedGeometryHeader cgHeader ;
/**
* Specifies that this CompressedGeometry object allows reading its
* byte count information.
*/
public static final int
ALLOW_COUNT_READ = CapabilityBits.COMPRESSED_GEOMETRY_ALLOW_COUNT_READ ;
/**
* Specifies that this CompressedGeometry object allows reading its
* header information.
*/
public static final int
ALLOW_HEADER_READ = CapabilityBits.COMPRESSED_GEOMETRY_ALLOW_HEADER_READ ;
/**
* Specifies that this CompressedGeometry object allows reading its
* geometry data component information.
*/
public static final int
ALLOW_GEOMETRY_READ =
CapabilityBits.COMPRESSED_GEOMETRY_ALLOW_GEOMETRY_READ ;
/**
* Specifies that this CompressedGeometry allows reading the geometry
* data reference information for this object. This is only used in
* by-reference geometry mode.
*
* @since Java 3D 1.2
*/
public static final int
ALLOW_REF_DATA_READ =
CapabilityBits.COMPRESSED_GEOMETRY_ALLOW_REF_DATA_READ;
// Array for setting default read capabilities
private static final int[] readCapabilities = {
ALLOW_COUNT_READ,
ALLOW_HEADER_READ,
ALLOW_GEOMETRY_READ,
ALLOW_REF_DATA_READ
};
/**
* Package scoped default constructor for use by cloneNodeComponent.
*/
CompressedGeometry() {
// set default read capabilities
setDefaultReadCapabilities(readCapabilities);
}
/**
* Creates a new CompressedGeometry NodeComponent by copying
* the specified compressed geometry data into this object.
* If the version number of compressed geometry, as specified by
* the CompressedGeometryHeader, is incompatible with the
* supported version of compressed geometry in the current version
* of Java 3D, then the compressed geometry object will not be
* rendered.
*
* @param hdr the compressed geometry header. This is copied
* into the CompressedGeometry NodeComponent.
*
* @param compressedGeometry the compressed geometry data. The
* geometry must conform to the format described in Appendix B of
* the Java 3D API Specification.
*
* @exception IllegalArgumentException if a problem is detected with the
* header
*
* @see CompressedGeometryHeader
* @see Canvas3D#queryProperties
*/
public CompressedGeometry(CompressedGeometryHeader hdr,
byte[] compressedGeometry) {
this(hdr, compressedGeometry, false) ;
}
/**
* Creates a new CompressedGeometry NodeComponent. The
* specified compressed geometry data is either copied into this
* object or is accessed by reference.
* If the version number of compressed geometry, as specified by
* the CompressedGeometryHeader, is incompatible with the
* supported version of compressed geometry in the current version
* of Java 3D, the compressed geometry object will not be
* rendered.
*
* @param hdr the compressed geometry header. This is copied
* into the CompressedGeometry NodeComponent.
*
* @param compressedGeometry the compressed geometry data. The
* geometry must conform to the format described in Appendix B of
* the Java 3D API Specification.
*
* @param byReference a flag that indicates whether the data is copied
* into this compressed geometry object or is accessed by reference.
*
* @exception IllegalArgumentException if a problem is detected with the
* header
*
* @see CompressedGeometryHeader
* @see Canvas3D#queryProperties
*
* @since Java 3D 1.2
*/
public CompressedGeometry(CompressedGeometryHeader hdr,
byte[] compressedGeometry,
boolean byReference) {
if ((hdr.size + hdr.start) > compressedGeometry.length)
throw new IllegalArgumentException
(J3dI18N.getString("CompressedGeometry0")) ;
// set default read capabilities
setDefaultReadCapabilities(readCapabilities);
// Create a separate copy of the given header.
cgHeader = new CompressedGeometryHeader() ;
hdr.copy(cgHeader) ;
// Create the retained object.
((CompressedGeometryRetained)this.retained).createCompressedGeometry
(cgHeader, compressedGeometry, byReference) ;
// This constructor is designed to accept byte arrays that may contain
// possibly many large compressed geometry blocks interspersed with
// non-J3D-specific metadata. Only one of these blocks is used per
// CompressedGeometry object, so set the geometry offset to zero in
// the header if the data itself is copied.
if (!byReference)
cgHeader.start = 0 ;
}
/**
* This constructor is not implemented.
*
* @exception UnsupportedOperationException this constructor is not
* implemented
*
* @since Java 3D 1.3
*/
public CompressedGeometry(CompressedGeometryHeader hdr,
J3DBuffer compressedGeometry) {
throw new UnsupportedOperationException(J3dI18N.getString("CompressedGeometry9")) ;
}
/**
* Returns the size, in bytes, of the compressed geometry buffer.
* The size of the compressed geometry header is not included.
*
* @return the size, in bytes, of the compressed geometry buffer.
*
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*/
public int getByteCount() {
if (isLiveOrCompiled())
if (!this.getCapability(ALLOW_COUNT_READ))
throw new CapabilityNotSetException
(J3dI18N.getString("CompressedGeometry1")) ;
return cgHeader.size ;
}
/**
* Copies the compressed geometry header from the CompressedGeometry
* NodeComponent into the passed in parameter.
*
* @param hdr the CompressedGeometryHeader object into which to copy the
* CompressedGeometry NodeComponent's header; the offset field may differ
* from that which was originally specified if a copy of the original
* compressed geometry byte array was created.
*
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*
* @see CompressedGeometryHeader
*/
public void getCompressedGeometryHeader(CompressedGeometryHeader hdr) {
if (isLiveOrCompiled())
if (!this.getCapability(ALLOW_HEADER_READ))
throw new CapabilityNotSetException
(J3dI18N.getString("CompressedGeometry2")) ;
cgHeader.copy(hdr) ;
}
/**
* Retrieves the compressed geometry associated with the
* CompressedGeometry NodeComponent object. Copies the compressed
* geometry from the CompressedGeometry node into the given array.
* The array must be large enough to hold all of the bytes.
* The individual array elements must be allocated by the caller.
*
* @param compressedGeometry the array into which to copy the compressed
* geometry.
*
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*
* @exception IllegalStateException if the data access mode for this
* object is by-reference.
*
* @exception ArrayIndexOutOfBoundsException if compressedGeometry byte
* array is not large enough to receive the compressed geometry
*/
public void getCompressedGeometry(byte[] compressedGeometry) {
if (isLiveOrCompiled())
if (!this.getCapability(ALLOW_GEOMETRY_READ))
throw new CapabilityNotSetException
(J3dI18N.getString("CompressedGeometry3")) ;
if (isByReference())
throw new IllegalStateException
(J3dI18N.getString("CompressedGeometry7")) ;
if (cgHeader.size > compressedGeometry.length)
throw new ArrayIndexOutOfBoundsException
(J3dI18N.getString("CompressedGeometry4")) ;
((CompressedGeometryRetained)this.retained).copy(compressedGeometry) ;
}
/**
* Decompresses the compressed geometry. Returns an array of Shape nodes
* containing the decompressed geometry objects, or null if the version
* number of the compressed geometry is incompatible with the decompressor
* in the current version of Java 3D.
*
* @return an array of Shape nodes containing the
* geometry decompressed from this CompressedGeometry NodeComponent
* object, or null if its version is incompatible
*
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*/
public Shape3D[] decompress() {
if (isLiveOrCompiled())
if (!this.getCapability(ALLOW_GEOMETRY_READ))
throw new CapabilityNotSetException
(J3dI18N.getString("CompressedGeometry5")) ;
CompressedGeometryRetained cgr =
(CompressedGeometryRetained)this.retained ;
GeometryDecompressorShape3D decompressor =
new GeometryDecompressorShape3D() ;
// Decompress the geometry as TriangleStripArrays. A combination of
// TriangleStripArrays and TrianglesFanArrays is more compact but
// requires twice as many Shape3D objects, resulting in slower
// rendering performance.
//
// Using TriangleArray output is currently the fastest, given the
// strip sizes observed from various compressed geometry objects, but
// produces about twice as many vertices. TriangleStripArray produces
// the same number of Shape3D objects as TriangleArray using 1/2
// to 2/3 of the vertices, with only a marginal performance penalty.
//
return decompressor.toTriangleStripArrays(cgr) ;
}
/**
* Retrieves the data access mode for this CompressedGeometry object.
*
* @return true if the data access mode for this
* CompressedGeometry object is by-reference;
* false if the data access mode is by-copying.
*
* @since Java 3D 1.2
*/
public boolean isByReference() {
return ((CompressedGeometryRetained)this.retained).isByReference() ;
}
/**
* Gets the compressed geometry data reference.
*
* @return the current compressed geometry data reference.
*
* @exception IllegalStateException if the data access mode for this
* object is not by-reference.
*
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*
* @since Java 3D 1.2
*/
public byte[] getCompressedGeometryRef() {
if (isLiveOrCompiled())
if (!this.getCapability(ALLOW_REF_DATA_READ))
throw new CapabilityNotSetException
(J3dI18N.getString("CompressedGeometry6")) ;
if (!isByReference())
throw new IllegalStateException
(J3dI18N.getString("CompressedGeometry8")) ;
return ((CompressedGeometryRetained)this.retained).getReference() ;
}
/**
* Gets the compressed geometry data buffer reference, which is
* always null since NIO buffers are not supported for
* CompressedGeometry objects.
*
* @return null
*
* @exception CapabilityNotSetException if appropriate capability is
* not set and this object is part of live or compiled scene graph
*
* @since Java 3D 1.3
*/
public J3DBuffer getCompressedGeometryBuffer() {
if (isLiveOrCompiled())
if (!this.getCapability(ALLOW_REF_DATA_READ))
throw new CapabilityNotSetException
(J3dI18N.getString("CompressedGeometry6")) ;
return null;
}
/**
* Creates the retained mode CompressedGeometryRetained object that this
* CompressedGeometry object will point to.
*/
@Override
void createRetained() {
this.retained = new CompressedGeometryRetained() ;
this.retained.setSource(this) ;
}
/**
* @deprecated replaced with cloneNodeComponent(boolean forceDuplicate)
*/
@Override
public NodeComponent cloneNodeComponent() {
CompressedGeometry cg = new CompressedGeometry() ;
// Duplicate data specific to this class.
cg.cgHeader = new CompressedGeometryHeader() ;
cgHeader.copy(cg.cgHeader) ;
// Duplicate the retained side.
CompressedGeometryRetained cgr = (CompressedGeometryRetained)retained ;
cgr.duplicate((CompressedGeometryRetained)cg.retained) ;
// Duplicate superclass data and return.
cg.duplicateNodeComponent(this) ;
return cg ;
}
}