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Java™ Binding for the OpenGL® API
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package jogamp.opengl.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 2.0 (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(final Mapdesc mapdesc) {
// DONE
this.mapdesc = mapdesc;
final 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(final Knotvector sknotvector, final Knotvector tknotvector,
final CArrayOfFloats ctrlarr, final int coords) {
final 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(final Knotvector knots, final CArrayOfFloats ctlarray, final int ncoords) {
// DONE
final 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(final float[] pta, final float[] ptb, final 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(final Backend backend) {
// DONE
if (getDimension() == 2) {
final 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);
final 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(final float[] pta, final float[] ptb) {
// DONE
final 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(final float[] from, final float[] to, final 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(final float[] from, final float[] to, final int i, final Flist list) {
// DONE
final 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(final float[] from, final float[] to, final Flist slist, final Flist tlist) {
// DONE
getRange(from, to, 0, slist);
getRange(from, to, 1, tlist);
}
/**
* Empty method
* @param sbrkpts
* @param tbrkpts
* @param rate
*/
public void findRates(final Flist sbrkpts, final Flist tbrkpts, final float[] rate) {
// TODO Auto-generated method stub
// System.out.println("TODO quilt.findrates");
}
}