compressionstream.java

JAVA3D矩陈的相关类

		vc.c = vc.c4 ;
	    }
	}

	public void processVertex(int v, int stripFlag) {
	    copyVertex(v + initialPositionIndex,
		       v + initialNormalIndex,
		       v + initialColorIndex, vc) ;

	    processVertexCopy(vc, stripFlag) ;
	}
    }

    /**
     * This class implements the GeometryAccessor interface for indexed
     * non-interleaved geometry arrays accessed with by-reference semantics.
     */
    private class IndexedByRefGeometry extends ByRefGeometry {
	IndexArrays ia = new IndexArrays() ;
	VertexIndices vi = new VertexIndices() ;

	IndexedByRefGeometry(GeometryArray ga) {
	    super(ga) ;
	    getIndexArrays(ga, ia) ;
	}

	public void processVertex(int v, int stripFlag) {
	    getVertexIndices(v, ia, vi) ;
	    copyVertex(vi.pi, vi.ni, vi.ci, vc) ;
	    processIndexedVertexCopy(vc, vi, stripFlag) ;
	}
    }

    /**
     * This class implements the GeometryAccessor interface for
     * non-interleaved geometry arrays accessed with NIO.
     */
    private class ByRefGeometryNIO implements GeometryAccessor {
	VertexCopy vc = new VertexCopy() ;

	ByteBufferWrapper   colorsB    = null ;
	FloatBufferWrapper  colorsF    = null ;
	FloatBufferWrapper  normals    = null ;
	FloatBufferWrapper  positionsF = null ;
	DoubleBufferWrapper positionsD = null ;

	int initialPositionIndex = 0 ;
	int initialNormalIndex   = 0 ;
	int initialColorIndex    = 0 ;

	ByRefGeometryNIO(GeometryArray ga) {
	    J3DBuffer buffer ;
	    buffer = ga.getCoordRefBuffer() ;
	    initialPositionIndex = ga.getInitialCoordIndex() ;

	    switch (BufferWrapper.getBufferType(buffer)) {
	    case BufferWrapper.TYPE_FLOAT:
		positionsF = new FloatBufferWrapper(buffer) ;
		if (debug) System.out.println("float positions buffer") ;
		break ;
	    case BufferWrapper.TYPE_DOUBLE:
		positionsD = new DoubleBufferWrapper(buffer) ;
		if (debug) System.out.println("double positions buffer") ;
		break ;
	    default:
		throw new IllegalArgumentException
		    ("\nposition buffer must be FloatBuffer or DoubleBuffer") ;
	    }

	    if (vertexColors) {
		buffer = ga.getColorRefBuffer() ;
		initialColorIndex = ga.getInitialColorIndex() ;
		
		switch (BufferWrapper.getBufferType(buffer)) {
		case BufferWrapper.TYPE_BYTE:
		    colorsB = new ByteBufferWrapper(buffer) ;
		    if (debug) System.out.println("byte colors buffer") ;
		    break ;
		case BufferWrapper.TYPE_FLOAT:
		    colorsF = new FloatBufferWrapper(buffer) ;
		    if (debug) System.out.println("float colors buffer") ;
		    break ;
		default:
		    throw new IllegalArgumentException
			("\ncolor buffer must be ByteBuffer or FloatBuffer") ;
		}
	    }

	    if (vertexNormals) {
		buffer = ga.getNormalRefBuffer() ;
		initialNormalIndex = ga.getInitialNormalIndex() ;

		switch (BufferWrapper.getBufferType(buffer)) {
		case BufferWrapper.TYPE_FLOAT:
		    normals = new FloatBufferWrapper(buffer) ;
		    if (debug) System.out.println("float normals buffer") ;
		    break ;
		default:
		    throw new IllegalArgumentException
			("\nnormal buffer must be FloatBuffer") ;
		}
	    }
	}

	void copyVertex(int pi, int ni, int ci, VertexCopy vc) {
	    pi *= 3 ;
	    if (positionsF != null) {
		vc.p = new Point3f(positionsF.get(pi + 0),
				   positionsF.get(pi + 1),
				   positionsF.get(pi + 2)) ;
	    }
	    else {
		vc.p = new Point3f((float)positionsD.get(pi + 0),
				   (float)positionsD.get(pi + 1),
				   (float)positionsD.get(pi + 2)) ;
	    }

	    ni *= 3 ;
	    if (vertexNormals) {
		vc.n = new Vector3f(normals.get(ni + 0),
				    normals.get(ni + 1),
				    normals.get(ni + 2)) ;
	    }

	    if (vertexColor3) {
		ci *= 3 ;
		if (colorsB != null) {
		    vc.c3 = new Color3f
			((colorsB.get(ci + 0) & 0xff) * ByteToFloatScale,
			 (colorsB.get(ci + 1) & 0xff) * ByteToFloatScale,
			 (colorsB.get(ci + 2) & 0xff) * ByteToFloatScale) ;
		}
		else {
		    vc.c3 = new Color3f(colorsF.get(ci + 0),
					colorsF.get(ci + 1),
					colorsF.get(ci + 2)) ;
		}
		vc.c = vc.c3 ;
	    }
	    else if (vertexColor4) {
		ci *= 4 ;
		if (colorsB != null) {
		    vc.c4 = new Color4f
			((colorsB.get(ci + 0) & 0xff) * ByteToFloatScale,
			 (colorsB.get(ci + 1) & 0xff) * ByteToFloatScale,
			 (colorsB.get(ci + 2) & 0xff) * ByteToFloatScale,
			 (colorsB.get(ci + 3) & 0xff) * ByteToFloatScale) ;
		}
		else {
		    vc.c4 = new Color4f(colorsF.get(ci + 0),
					colorsF.get(ci + 1),
					colorsF.get(ci + 2),
					colorsF.get(ci + 3)) ;
		}
		vc.c = vc.c4 ;
	    }
	}

	public void processVertex(int v, int stripFlag) {
	    copyVertex(v + initialPositionIndex,
		       v + initialNormalIndex,
		       v + initialColorIndex, vc) ;

	    processVertexCopy(vc, stripFlag) ;
	}
    }

    /**
     * This class implements the GeometryAccessor interface for
     * non-interleaved indexed geometry arrays accessed with NIO.
     */
    private class IndexedByRefGeometryNIO extends ByRefGeometryNIO {
	IndexArrays ia = new IndexArrays() ;
	VertexIndices vi = new VertexIndices() ;

	IndexedByRefGeometryNIO(GeometryArray ga) {
	    super(ga) ;
	    getIndexArrays(ga, ia) ;
	}

	public void processVertex(int v, int stripFlag) {
	    getVertexIndices(v, ia, vi) ;
	    copyVertex(vi.pi, vi.ni, vi.ci, vc) ;
	    processIndexedVertexCopy(vc, vi, stripFlag) ;
	}
    }

    /**
     * Convert a GeometryArray to compression stream elements and add them to
     * this stream.
     *
     * @param ga GeometryArray to convert
     * @exception IllegalArgumentException if GeometryArray has a
     * dimensionality or vertex format inconsistent with the CompressionStream
     */
    void addGeometryArray(GeometryArray ga) {
	int firstVertex = 0 ;
	int validVertexCount = 0 ;
	int vertexFormat = ga.getVertexFormat() ;
	GeometryAccessor geometryAccessor = null ;

	if (streamType != getStreamType(ga))
	    throw new IllegalArgumentException
		("GeometryArray has inconsistent dimensionality") ;

	if (vertexComponents != getVertexComponents(vertexFormat))
	    throw new IllegalArgumentException
		("GeometryArray has inconsistent vertex components") ;

	// Set up for vertex data access semantics.
	boolean NIO = (vertexFormat & GeometryArray.USE_NIO_BUFFER) != 0 ;
	boolean byRef = (vertexFormat & GeometryArray.BY_REFERENCE) != 0 ;
	boolean interleaved = (vertexFormat & GeometryArray.INTERLEAVED) != 0 ;
	boolean indexedGeometry = ga instanceof IndexedGeometryArray ;

	if (indexedGeometry) {
	    if (debug) System.out.println("indexed") ;
	    // Index arrays will be copied such that valid indices start at
	    // offset 0 in the copied arrays.
	    firstVertex = 0 ;
	    validVertexCount = ((IndexedGeometryArray)ga).getValidIndexCount() ;
	}

	if (!byRef) {
	    if (debug) System.out.println("by-copy") ;
	    if (indexedGeometry) {
		geometryAccessor = new IndexedByCopyGeometry(ga) ;
	    }
	    else {
		firstVertex = 0 ;
		validVertexCount = ga.getValidVertexCount() ;
		geometryAccessor = new ByCopyGeometry(ga) ;
	    }
	}
	else if (interleaved && NIO) {
	    if (debug) System.out.println("interleaved NIO") ;
	    if (indexedGeometry) {
		geometryAccessor = new IndexedInterleavedGeometryNIO(ga) ;
	    }
	    else {
		firstVertex = ga.getInitialVertexIndex() ;
		validVertexCount = ga.getValidVertexCount() ;
		geometryAccessor = new InterleavedGeometryNIO(ga) ;
	    }
	}
	else if (interleaved && !NIO) {
	    if (debug) System.out.println("interleaved") ;
	    if (indexedGeometry) {
		geometryAccessor = new IndexedInterleavedGeometryFloat(ga) ;
	    }
	    else {
		firstVertex = ga.getInitialVertexIndex() ;
		validVertexCount = ga.getValidVertexCount() ;
		geometryAccessor = new InterleavedGeometryFloat(ga) ;
	    }
	}
	else if (!interleaved && NIO) {
	    if (debug) System.out.println("non-interleaved NIO") ;
	    if (indexedGeometry) {
		geometryAccessor = new IndexedByRefGeometryNIO(ga) ;
	    }
	    else {
		firstVertex = 0 ;
		validVertexCount = ga.getValidVertexCount() ;
		geometryAccessor = new ByRefGeometryNIO(ga) ;
	    }
	}
	else if (!interleaved && !NIO) {
	    if (debug) System.out.println("non-interleaved by-ref") ;
	    if (indexedGeometry) {
		geometryAccessor = new IndexedByRefGeometry(ga) ;
	    }
	    else {
		firstVertex = 0 ;
		validVertexCount = ga.getValidVertexCount() ;
		geometryAccessor = new ByRefGeometry(ga) ;
	    }
	}

	// Set up for topology.
	int stripCount = 0 ;
	int stripCounts[] = null ;
	int constantStripLength = 0 ;
	int replaceCode = RESTART ;
	boolean strips = false ;
	boolean implicitStrips = false ;

	if (ga instanceof TriangleStripArray ||
	    ga instanceof IndexedTriangleStripArray ||
	    ga instanceof LineStripArray ||
	    ga instanceof IndexedLineStripArray) {

	    strips = true ;
	    replaceCode = REPLACE_OLDEST ;
	    if (debug) System.out.println("strips") ;
	}
	else if (ga instanceof TriangleFanArray ||
		 ga instanceof IndexedTriangleFanArray) {
	    
	    strips = true ;
	    replaceCode = REPLACE_MIDDLE ;
	    if (debug) System.out.println("fans") ;
	}
	else if (ga instanceof QuadArray ||
		 ga instanceof IndexedQuadArray) {

	    // Handled as fan arrays with 4 vertices per fan.
	    implicitStrips = true ;
	    constantStripLength = 4 ;
	    replaceCode = REPLACE_MIDDLE ;
	    if (debug) System.out.println("quads") ;
	}

	// Get strip counts.
	if (strips) {
	    if (indexedGeometry) {
		IndexedGeometryStripArray igsa ;
		igsa = (IndexedGeometryStripArray)ga ;

		stripCount = igsa.getNumStrips() ;
		stripCounts = new int[stripCount] ;
		igsa.getStripIndexCounts(stripCounts) ;

	    } else {
		GeometryStripArray gsa ;
		gsa = (GeometryStripArray)ga ;

		stripCount = gsa.getNumStrips() ;
		stripCounts = new int[stripCount] ;
		gsa.getStripVertexCounts(stripCounts) ;
	    }
	}

	// Build the compression stream for this shape's geometry.
	int v = firstVertex ;
	if (strips) {
	    for (int i = 0 ; i < stripCount ; i++) {
		geometryAccessor.processVertex(v++, RESTART) ;
		for (int j = 1 ; j < stripCounts[i] ; j++) {
		    geometryAccessor.processVertex(v++, replaceCode) ;
		}
	    }
	}
	else if (implicitStrips) {
	    while (v < firstVertex + validVertexCount) {
		geometryAccessor.processVertex(v++, RESTART) ;
		for (int j = 1 ; j < constantStripLength ; j++) {
		    geometryAccessor.processVertex(v++, replaceCode) ;
		}
	    }
	}
	else {
	    while (v < firstVertex + validVertexCount) {
		geometryAccessor.processVertex(v++, RESTART) ;
	    }
	}
    }

    /**
     * Print the stream to standard output.
     */
    void print() {
	System.out.println("\nstream has " + stream.size() + " entries") ;
	System.out.println("uncompressed size " + byteCount + " bytes") ;
	System.out.println("upper position bound: " + mcBounds[1].toString()) ;
	System.out.println("lower position bound: " + mcBounds[0].toString()) ;
	System.out.println("X, Y, Z centers (" +
			   ((float)center[0]) + " " +
			   ((float)center[1]) + " " +
			   ((float)center[2]) + ")\n" +
			   "scale " + ((float)scale) + "\n") ;

	Iterator i = stream.iterator() ;
	while (i.hasNext()) {
	    System.out.println(i.next().toString() + "\n") ;
	}
    }


    ////////////////////////////////////////////////////////////////////////////
    //									      //
    // The following constructors and methods are currently the only public   //
    // members of this class.  All other members are subject to revision.     //
    //									      //
    ////////////////////////////////////////////////////////////////////////////

    /**
     * Creates a CompressionStream from an array of Shape3D scene graph
     * objects.  These Shape3D objects may only consist of a GeometryArray
     * component and an optional Appearance component.  The resulting stream
     * may be used as input to the GeometryCompressor methods.<p>
     *
     * Each Shape3D in the array must be of the same dimensionality (point,
     * line, or surface) and have the same vertex format as the others.
     * Texture coordinates are ignored.<p>
     *
     * If a color is specified in the material attributes for a Shape3D then
     * that color is added to the CompressionStream as the current global
     * color.  Subsequent colors as well as any colors bundled with vertices
     * will override it.  Only the material diffuse colors are used; all other
     * appearance attributes are ignored.<p>
     *
     * @param positionQuant
     * number of bits to quantize each position's X, Y,
     * and Z components, ranging from 1 to 16
     *
     * @param colorQuant
     * number of bits to quantize each color's R, G, B, and
     * alpha components, ranging from 2 to 16
     *
     * @pa