SGI SI GLU library

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diff --git a/src/glu/sgi/libnurbs/internals/backend.h b/src/glu/sgi/libnurbs/internals/backend.h
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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.
+*/
+
+/*
+ * backend.h
+ *
+ * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
+ * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/backend.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
+ */
+
+#ifndef __glubackend_h_
+#define __glubackend_h_
+
+#include "trimvertex.h"
+#include "gridvertex.h"
+#include "gridtrimvertex.h"
+
+class BasicCurveEvaluator;
+class BasicSurfaceEvaluator;
+
+class Backend {
+private:
+    BasicCurveEvaluator&	curveEvaluator;
+    BasicSurfaceEvaluator&	surfaceEvaluator;
+public:
+  			Backend( BasicCurveEvaluator &c, BasicSurfaceEvaluator& e )
+			: curveEvaluator(c), surfaceEvaluator(e) {}
+
+    /* surface backend routines */
+    void		bgnsurf( int, int, long  );
+    void		patch( REAL, REAL, REAL, REAL );
+    void		surfpts( long, REAL *, long, long, int, int,
+          			 REAL, REAL, REAL, REAL );
+    void		surfbbox( long, REAL *, REAL * );
+    void		surfgrid( REAL, REAL, long, REAL, REAL, long ); 
+    void		surfmesh( long, long, long, long ); 
+    void		bgntmesh( char * );
+    void		endtmesh( void );
+    void		swaptmesh( void );
+    void		tmeshvert( GridTrimVertex * );
+    void		tmeshvert( TrimVertex * );
+    void		tmeshvert( GridVertex * );
+    void		tmeshvert( REAL u,  REAL v );
+    void		linevert( TrimVertex * );
+    void		linevert( GridVertex * );
+    void		bgnoutline( void );
+    void		endoutline( void );
+    void		endsurf( void );
+    void		triangle( TrimVertex*, TrimVertex*, TrimVertex* );
+
+    void                bgntfan();
+    void                endtfan();
+    void                bgnqstrip();
+    void                endqstrip();
+    void                evalUStrip(int n_upper, REAL v_upper, REAL* upper_val, 
+				   int n_lower, REAL v_lower, REAL* lower_val
+				   );
+    void                evalVStrip(int n_left, REAL u_left, REAL* left_val, 
+				   int n_right, REAL v_right, REAL* right_val
+				   );
+    void                tmeshvertNOGE(TrimVertex *t);
+    void                tmeshvertNOGE_BU(TrimVertex *t);
+    void                tmeshvertNOGE_BV(TrimVertex *t);
+    void                preEvaluateBU(REAL u);
+    void                preEvaluateBV(REAL v);
+	
+
+    /* curve backend routines */
+    void		bgncurv( void );
+    void		segment( REAL, REAL );
+    void		curvpts( long, REAL *, long, int, REAL, REAL );
+    void		curvgrid( REAL, REAL, long );
+    void		curvmesh( long, long );
+    void		curvpt( REAL  );  
+    void		bgnline( void );
+    void		endline( void );
+    void		endcurv( void );
+private:
+#ifndef NOWIREFRAME
+    int			wireframetris;
+    int			wireframequads;
+    int			npts;
+    REAL		mesh[3][4];
+    int			meshindex;
+#endif
+};
+
+#endif /* __glubackend_h_ */