SGI SI GLU library

1 files changed, 116 insertions, 0 deletions

diff --git a/src/glu/sgi/libnurbs/internals/trimregion.cc b/src/glu/sgi/libnurbs/internals/trimregion.cc
new file mode 100644
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+++ b/src/glu/sgi/libnurbs/internals/trimregion.cc
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+/*
+** 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.
+*/
+
+/*
+ * trimregion.c++
+ *
+ * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
+ * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/trimregion.cc,v 1.1 2001/03/17 00:25:41 brianp Exp $
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "trimregion.h"
+#include "backend.h"
+
+TrimRegion::TrimRegion( void )
+{
+}
+
+void
+TrimRegion::setDu( REAL du )
+{
+    oneOverDu = 1.0/du;
+}
+
+void
+TrimRegion::init( long npts, Arc_ptr extrema )
+{
+    left.init( npts, extrema, extrema->pwlArc->npts - 1 ); 
+    left.getNextPt();
+
+    right.init( npts, extrema, 0 ); 
+    right.getPrevPt();
+}
+
+void
+TrimRegion::getPts( Arc_ptr extrema )
+{
+    left.getNextPts( extrema );
+    right.getPrevPts( extrema );
+}
+
+void
+TrimRegion::getPts( Backend &backend )
+{
+    left.getNextPts( bot.vval, backend );
+    right.getPrevPts( bot.vval, backend );
+}
+
+void 
+TrimRegion::getGridExtent( void )
+{
+    getGridExtent( left.last(), right.last() );
+}
+
+void
+TrimRegion::getGridExtent( TrimVertex *l, TrimVertex *r )
+{
+    bot.ustart = (long) ((l->param[0] - uarray.uarray[0])*oneOverDu);
+    if( l->param[0] >= uarray.uarray[bot.ustart] ) bot.ustart++;
+//  if( l->param[0] > uarray.uarray[bot.ustart] ) bot.ustart++;
+    assert( l->param[0] <= uarray.uarray[bot.ustart] );
+    assert( l->param[0] >= uarray.uarray[bot.ustart-1] );
+
+    bot.uend = (long) ((r->param[0] - uarray.uarray[0])*oneOverDu);
+    if( uarray.uarray[bot.uend] >= r->param[0] ) bot.uend--;
+//  if( uarray.uarray[bot.uend] > r->param[0] ) bot.uend--;
+    assert( r->param[0] >= uarray.uarray[bot.uend] );
+    assert( r->param[0] <= uarray.uarray[bot.uend+1] );
+}
+
+int
+TrimRegion::canTile( void )
+{
+    TrimVertex *lf = left.first();
+    TrimVertex *ll = left.last();
+    TrimVertex *l = ( ll->param[0] > lf->param[0] ) ? ll : lf; 
+
+    TrimVertex *rf = right.first();
+    TrimVertex *rl = right.last();
+    TrimVertex *r = ( rl->param[0] < rf->param[0] ) ? rl : rf;
+    return (l->param[0] <= r->param[0]) ? 1 : 0;
+}
+