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+package com.sun.opengl.impl.glu.nurbs;
+
+/*
+ ** License Applicability. Except to the extent portions of this file are
+ ** made subject to an alternative license as permitted in the SGI Free
+ ** Software License B, Version 1.1 (the "License"), the contents of this
+ ** file are subject only to the provisions of the License. You may not use
+ ** this file except in compliance with the License. You may obtain a copy
+ ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+ ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+ **
+ ** http://oss.sgi.com/projects/FreeB
+ **
+ ** Note that, as provided in the License, the Software is distributed on an
+ ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+ ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+ ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+ ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+ **
+ ** Original Code. The Original Code is: OpenGL Sample Implementation,
+ ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+ ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+ ** Copyright in any portions created by third parties is as indicated
+ ** elsewhere herein. All Rights Reserved.
+ **
+ ** Additional Notice Provisions: The application programming interfaces
+ ** established by SGI in conjunction with the Original Code are The
+ ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+ ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+ ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+ ** Window System(R) (Version 1.3), released October 19, 1998. This software
+ ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+ ** published by SGI, but has not been independently verified as being
+ ** compliant with the OpenGL(R) version 1.2.1 Specification.
+ */
+
+/**
+ * Class for converting NURBS curves and surfaces to list of bezier arcs or patches repectively
+ * @author Tomáš Hráský
+ *
+ */
+public class Quilt {
+ /**
+ * Maximum quilt dimension
+ */
+ private static final int MAXDIM = 2;
+
+ /**
+ * List of map descriptions
+ */
+ Mapdesc mapdesc;
+
+ /**
+ * Array of quiltspecs pointer
+ */
+ public CArrayOfQuiltspecs qspec;
+
+ /**
+ * End array of quilt specs pointer
+ */
+ public CArrayOfQuiltspecs eqspec;
+
+ /**
+ * Control points
+ */
+ public CArrayOfFloats cpts;
+
+ /**
+ * Next quilt in list
+ */
+ public Quilt next;
+
+ /**
+ * Makes new quilt with mapdesc
+ * @param mapdesc map description
+ */
+ public Quilt(Mapdesc mapdesc) {
+ // DONE
+ this.mapdesc = mapdesc;
+ Quiltspec[] tmpquilts = new Quiltspec[MAXDIM];
+ for (int i = 0; i < tmpquilts.length; i++)
+ tmpquilts[i] = new Quiltspec();
+ this.qspec = new CArrayOfQuiltspecs(tmpquilts);
+
+ }
+
+ /**
+ * Converts NURBS surface to bezier patches
+ * @param sknotvector knots in u direction
+ * @param tknotvector knots in v direction
+ * @param ctrlarr control points
+ * @param coords control points coords
+ */
+ public void toBezier(Knotvector sknotvector, Knotvector tknotvector,
+ CArrayOfFloats ctrlarr, int coords) {
+ Splinespec spline = new Splinespec(2);
+ spline.kspecinit(sknotvector, tknotvector);
+ spline.select();
+ spline.layout(coords);
+ spline.setupquilt(this);
+ spline.copy(ctrlarr);
+ spline.transform();
+ }
+
+ /**
+ * Converts NURBS curve to list of bezier curves
+ * @param knots knot vector
+ * @param ctlarray control points
+ * @param ncoords number of coordinates
+ */
+ public void toBezier(Knotvector knots, CArrayOfFloats ctlarray, int ncoords) {
+ // DONE
+ Splinespec spline = new Splinespec(1);
+ spline.kspecinit(knots);
+ spline.select();
+ spline.layout(ncoords);
+ spline.setupquilt(this);
+ spline.copy(ctlarray);
+ spline.transform();
+ }
+
+ /**
+ * Walks thru all arcs/patches
+ * @param pta low border
+ * @param ptb high border
+ * @param backend Backend
+ */
+ public void downloadAll(float[] pta, float[] ptb, Backend backend) {
+ // DONE
+ for (Quilt m = this; m != null; m = m.next) {
+ m.select(pta, ptb);
+ m.download(backend);
+ }
+
+ }
+
+ /**
+ * Renders arcs/patches
+ * @param backend Backend for rendering
+ */
+ private void download(Backend backend) {
+ // DONE
+ if (getDimension() == 2) {
+
+ CArrayOfFloats ps = new CArrayOfFloats(cpts);
+ ps.raisePointerBy(qspec.get(0).offset);
+ ps.raisePointerBy(qspec.get(1).offset);
+ ps.raisePointerBy(qspec.get(0).index * qspec.get(0).order
+ * qspec.get(0).stride);
+ ps.raisePointerBy(qspec.get(1).index * qspec.get(1).order
+ * qspec.get(1).stride);
+
+ backend.surfpts(mapdesc.getType(), ps, qspec.get(0).stride, qspec
+ .get(1).stride, qspec.get(0).order, qspec.get(1).order,
+ qspec.get(0).breakpoints[qspec.get(0).index],
+ qspec.get(0).breakpoints[qspec.get(0).index + 1], qspec
+ .get(1).breakpoints[qspec.get(1).index], qspec
+ .get(1).breakpoints[qspec.get(1).index + 1]);
+
+ } else {// code for curves
+ // CArrayOfFloats ps=new CArrayOfFloats(cpts);
+ CArrayOfFloats ps = new CArrayOfFloats(cpts.getArray(), 0);
+ ps.raisePointerBy(qspec.get(0).offset);
+ ps.raisePointerBy(qspec.get(0).index * qspec.get(0).order
+ * qspec.get(0).stride);
+ backend.curvpts(mapdesc.getType(), ps, qspec.get(0).stride, qspec
+ .get(0).order,
+ qspec.get(0).breakpoints[qspec.get(0).index],
+ qspec.get(0).breakpoints[qspec.get(0).index + 1]);
+ }
+
+ }
+
+ /**
+ * Returns quilt dimension
+ * @return quilt dimesion
+ */
+ private int getDimension() {
+ // DONE
+ return eqspec.getPointer() - qspec.getPointer();
+ }
+
+ /**
+ * Finds Quiltspec.index
+ * @param pta range
+ * @param ptb range
+ */
+ private void select(float[] pta, float[] ptb) {
+ // DONE
+ int dim = eqspec.getPointer() - qspec.getPointer();
+ int i, j;
+ for (i = 0; i < dim; i++) {
+ for (j = qspec.get(i).width - 1; j >= 0; j--)
+ if (qspec.get(i).breakpoints[j] <= pta[i]
+ && ptb[i] <= qspec.get(i).breakpoints[j + 1])
+ break;
+ assert (j != -1);
+ qspec.get(i).index = j;
+ }
+ }
+
+ /**
+ * Find range according to breakpoints
+ * @param from low param
+ * @param to high param
+ * @param bpts breakpoints
+ */
+ public void getRange(float[] from, float[] to, Flist bpts) {
+ // DONE
+ getRange(from, to, 0, bpts);
+
+ }
+
+ /**
+ * Find range according to breakpoints
+ * @param from low param
+ * @param to high param
+ * @param i from/to array index
+ * @param list breakpoints
+ */
+ private void getRange(float[] from, float[] to, int i, Flist list) {
+ // DONE
+ Quilt maps = this;
+ from[i] = maps.qspec.get(i).breakpoints[0];
+ to[i] = maps.qspec.get(i).breakpoints[maps.qspec.get(i).width];
+ int maxpts = 0;
+ Quilt m;
+ for (m = maps; m != null; m = m.next) {
+ if (m.qspec.get(i).breakpoints[0] > from[i])
+ from[i] = m.qspec.get(i).breakpoints[0];
+ if (m.qspec.get(i).breakpoints[m.qspec.get(i).width] < to[i])
+ to[i] = m.qspec.get(i).breakpoints[m.qspec.get(i).width];
+ maxpts += m.qspec.get(i).width + 1;
+ }
+ list.grow(maxpts);
+ for (m = maps; m != null; m = m.next) {
+ for (int j = 0; j <= m.qspec.get(i).width; j++) {
+ list.add(m.qspec.get(i).breakpoints[j]);
+ }
+ }
+ list.filter();
+ list.taper(from[i], to[i]);
+ }
+
+ /**
+ * Is this quilt culled
+ * @return 0 or Subdivider.CULL_ACCEPT
+ */
+ public int isCulled() {
+ if (mapdesc.isCulling()) {
+ // System.out.println("TODO quilt.isculled mapdesc.isculling");
+ return 0;
+ } else {
+ return Subdivider.CULL_ACCEPT;
+ }
+ }
+
+ /**
+ * Finds range for surface
+ * @param from low param
+ * @param to high param
+ * @param slist u direction breakpoints
+ * @param tlist v direction breakpoints
+ */
+ public void getRange(float[] from, float[] to, Flist slist, Flist tlist) {
+ // DONE
+ getRange(from, to, 0, slist);
+ getRange(from, to, 1, tlist);
+
+ }
+
+ /**
+ * Empty method
+ * @param sbrkpts
+ * @param tbrkpts
+ * @param rate
+ */
+ public void findRates(Flist sbrkpts, Flist tbrkpts, float[] rate) {
+ // TODO Auto-generated method stub
+ // System.out.println("TODO quilt.findrates");
+ }
+}