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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.
*/
/**
* NURBS definition
* @author Tomas Hrasky
*
*/
public class Splinespec {
/**
* Dimension
*/
private final int dim;
/**
* Knot vector specs
*/
private Knotspec kspec;
/**
* Control points after conversion
*/
private CArrayOfFloats outcpts;
/**
* Makes new Splinespec with given dimension
* @param i dimension
*/
public Splinespec(final int i) {
// DONE
this.dim = i;
}
/**
* Initializes knotspec according to knotvector
* @param knotvector basic knotvector
*/
public void kspecinit(final Knotvector knotvector) {
// DONE
this.kspec = new Knotspec();
kspec.inkbegin = new CArrayOfFloats(knotvector.knotlist, 0);
kspec.inkend = new CArrayOfFloats(knotvector.knotlist,
knotvector.knotcount);
kspec.prestride = knotvector.stride;
kspec.order = knotvector.order;
kspec.next = null;
}
/**
* Initializes knotspec according to knotvector - SURFACE
* @param sknotvector knotvector in u dir
* @param tknotvector knotvector in v dir
*/
public void kspecinit(final Knotvector sknotvector, final Knotvector tknotvector) {
// DONE
this.kspec = new Knotspec();
final Knotspec tkspec = new Knotspec();
kspec.inkbegin = new CArrayOfFloats(sknotvector.knotlist, 0);
kspec.inkend = new CArrayOfFloats(sknotvector.knotlist,
sknotvector.knotcount);
kspec.prestride = sknotvector.stride;
kspec.order = sknotvector.order;
kspec.next = tkspec;
tkspec.inkbegin = new CArrayOfFloats(tknotvector.knotlist, 0);
tkspec.inkend = new CArrayOfFloats(tknotvector.knotlist,
tknotvector.knotcount);
tkspec.prestride = tknotvector.stride;
tkspec.order = tknotvector.order;
tkspec.next = null;
}
/**
* Preselect and select knotspecs
*/
public void select() {
// DONE
for (Knotspec knotspec = kspec; knotspec != null; knotspec = knotspec.next) {
knotspec.preselect();
knotspec.select();
}
}
/**
* Prepares for conversion
* @param ncoords number of coords
*/
public void layout(final int ncoords) {
// DONE
int stride = ncoords;
for (Knotspec knotspec = kspec; knotspec != null; knotspec = knotspec.next) {
knotspec.poststride = stride;
stride *= (knotspec.bend.getPointer() - knotspec.bbegin
.getPointer())
* knotspec.order + knotspec.postoffset;
knotspec.preoffset *= knotspec.prestride;
knotspec.prewidth *= knotspec.poststride;
knotspec.postwidth *= knotspec.poststride;
knotspec.postoffset *= knotspec.poststride;
knotspec.ncoords = ncoords;
}
outcpts = new CArrayOfFloats(new float[stride]);
}
/**
* Prepares quilt for conversion
* @param quilt quilt to work with
*/
public void setupquilt(final Quilt quilt) {
// DONE
final CArrayOfQuiltspecs qspec = new CArrayOfQuiltspecs(quilt.qspec);
quilt.eqspec = new CArrayOfQuiltspecs(qspec.getArray(), dim);
for (Knotspec knotspec = kspec; knotspec != null;) {
qspec.get().stride = knotspec.poststride;
qspec.get().width = knotspec.bend.getPointer()
- knotspec.bbegin.getPointer();
qspec.get().order = knotspec.order;
qspec.get().offset = knotspec.postoffset;
qspec.get().index = 0;
qspec.get().bdry[0] = (knotspec.kleft.getPointer() == knotspec.kfirst
.getPointer()) ? 1 : 0;
qspec.get().bdry[1] = (knotspec.kright.getPointer() == knotspec.klast
.getPointer()) ? 1 : 0;
qspec.get().breakpoints = new float[qspec.get().width + 1];
final CArrayOfFloats k = new CArrayOfFloats(qspec.get().breakpoints, 0);
for (final CArrayOfBreakpts bk = new CArrayOfBreakpts(knotspec.bbegin); bk
.getPointer() <= knotspec.bend.getPointer(); bk.pp()) {
k.set(bk.get().value);
k.pp();
}
knotspec = knotspec.next;
if (knotspec != null)
qspec.pp();
}
quilt.cpts = new CArrayOfFloats(outcpts);
quilt.next = null;
}
/**
* Copies array of control points to output array
* @param ctlarray control points array
*/
public void copy(final CArrayOfFloats ctlarray) {
// DONE
kspec.copy(ctlarray, outcpts);
}
/**
* Transforms knotspecs - conversion
*/
public void transform() {
// DONE
Knotspec knotspec;
outcpts.setPointer(0);
for (knotspec = kspec; knotspec != null; knotspec = knotspec.next)
knotspec.istransformed = false;
for (knotspec = kspec; knotspec != null; knotspec = knotspec.next) {
for (Knotspec kspec2 = kspec; kspec2 != null; kspec2 = kspec2.next)
kspec2.kspectotrans = knotspec;
kspec.transform(outcpts);
knotspec.istransformed = true;
}
}
}
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