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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
*
*/
#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( const 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_ */
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