nurbstess.cc

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/*
** 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.
*/

/*
 * nurbstess.c++
 *
 * $Date: 2006/03/14 15:08:52 $ $Revision: 1.2 $
 * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/nurbstess.cc,v 1.2 2006/03/14 15:08:52 brianp Exp $
 */

#include "glimports.h"
#include "myassert.h"
#include "mysetjmp.h"
#include "mystdio.h"
#include "nurbsconsts.h"
#include "nurbstess.h"
#include "bufpool.h"
#include "quilt.h"
#include "knotvector.h"
#include "mapdesc.h"
#include "maplist.h"

void 
NurbsTessellator::set_domain_distance_u_rate(REAL u_rate)
{
  subdivider.set_domain_distance_u_rate(u_rate);
}

void 
NurbsTessellator::set_domain_distance_v_rate(REAL v_rate)
{
  subdivider.set_domain_distance_v_rate(v_rate);
}

void
NurbsTessellator::set_is_domain_distance_sampling(int flag)
{
  subdivider.set_is_domain_distance_sampling(flag);
}

void
NurbsTessellator::resetObjects( void )
{
    subdivider.clear();
}

void
NurbsTessellator::makeobj( int )
{
#ifndef NDEBUG
   _glu_dprintf( "makeobj\n" );
#endif
}

void
NurbsTessellator::closeobj( void )
{
#ifndef NDEBUG
   _glu_dprintf( "closeobj\n" );
#endif
}

void
NurbsTessellator::bgnrender( void )
{
#ifndef NDEBUG
   _glu_dprintf( "bgnrender\n" );
#endif
}

void
NurbsTessellator::endrender( void )
{
#ifndef NDEBUG
    _glu_dprintf( "endrender\n" );
#endif
}

/*-----------------------------------------------------------------------------
 * do_freebgnsurface - free o_surface structure 
 *
 * Client: do_freeall(), bgnsurface()
 *-----------------------------------------------------------------------------
 */
void
NurbsTessellator::do_freebgnsurface( O_surface *o_surface )
{
    o_surface->deleteMe( o_surfacePool );
}


/*-----------------------------------------------------------------------------
 * do_bgnsurface - begin the display of a surface
 *
 * Client: bgnsurface()
 *-----------------------------------------------------------------------------
 */
void
NurbsTessellator::do_bgnsurface( O_surface *o_surface )
{
    if( inSurface ) {
	do_nurbserror( 27 );
	endsurface();
    }
    inSurface = 1;

    if( ! playBack ) bgnrender();

    isTrimModified = 0;
    isSurfaceModified = 0;
    isDataValid = 1;
    numTrims = 0;
    currentSurface = o_surface;
    nextTrim = &( currentSurface->o_trim );
    nextNurbssurface = &( currentSurface->o_nurbssurface );
}

/*-----------------------------------------------------------------------------
 * do_bgncurve - begin the display of a curve 
 * 
 * Client: bgncurve()
 *-----------------------------------------------------------------------------
 */
void
NurbsTessellator::do_bgncurve( O_curve *o_curve )
{
    if ( inCurve ) {
	do_nurbserror( 6 );
	endcurve();
    }

    inCurve = 1;
    currentCurve = o_curve;
    currentCurve->curvetype = ct_none;

    if( inTrim ) {
        if( *nextCurve != o_curve ) {
	    isCurveModified = 1;
	    *nextCurve = o_curve;
	}
    } else {
        if( ! playBack ) bgnrender();
        isDataValid = 1;
    }
    nextCurve = &(o_curve->next);
    nextPwlcurve = &(o_curve->curve.o_pwlcurve);
    nextNurbscurve = &(o_curve->curve.o_nurbscurve);
}

/*-----------------------------------------------------------------------------
 * do_endcurve -
 * 
 * Client: endcurve()
 *-----------------------------------------------------------------------------
 */
    
void
NurbsTessellator::do_endcurve( void )
{
    if( ! inCurve ) {
	do_nurbserror( 7 );
	return;
    }
    inCurve = 0;

    *nextCurve = 0;
    if (currentCurve->curvetype == ct_nurbscurve)
	*nextNurbscurve = 0;
    else
	*nextPwlcurve = 0;

    if ( ! inTrim ) {
        if( ! isDataValid ) {
            do_freecurveall( currentCurve ); 
	    return;
        }

	int errval;
	errval = ::mysetjmp( jumpbuffer );
	if( errval == 0 ) {
	    if( currentCurve->curvetype == ct_nurbscurve ) {
		subdivider.beginQuilts();
		for( O_nurbscurve *n = currentCurve->curve.o_nurbscurve; n != 0; n = n->next ) 
		    subdivider.addQuilt( n->bezier_curves );
		subdivider.endQuilts();
		subdivider.drawCurves(); 
		if( ! playBack ) endrender();
	    } else {
		/* XXX */
	        if( ! playBack ) endrender();
	        /*do_draw_pwlcurve( currentCurve->curve.o_pwlcurve ) */;
	        do_nurbserror( 9 );
	    }
	} else {
	    if( ! playBack ) endrender();
	    do_nurbserror( errval );
	}
	do_freecurveall( currentCurve );
	resetObjects();
    }
}

/*-----------------------------------------------------------------------------
 * do_endsurface - mark end of surface, display surface, free immediate data 
 *
 * Client:
 *-----------------------------------------------------------------------------
 */
void
NurbsTessellator::do_endsurface( void )
{
    if( inTrim ) {
	do_nurbserror( 12 );
	endtrim();
    }

    if( ! inSurface ) {
	do_nurbserror( 13 );
	return;
    }
    inSurface = 0;

    *nextNurbssurface = 0;

    if( ! isDataValid ) {
        do_freeall( ); 
	return;
    }

    if( *nextTrim != 0 ) {
	isTrimModified = 1;
        *nextTrim = 0;
    }

    int errval;

    errval = ::mysetjmp( jumpbuffer );
    if( errval == 0 ) {
        if( numTrims > 0 ) {

	    subdivider.beginTrims();
	    for( O_trim	*trim = currentSurface->o_trim; trim; trim = trim->next ) {
		subdivider.beginLoop();
		for( O_curve *curve = trim->o_curve; curve; curve = curve->next ) {  
		    curve->used = 0;
		    assert( curve->curvetype != ct_none );
		    if (curve->curvetype == ct_pwlcurve) {
			O_pwlcurve *c = curve->curve.o_pwlcurve; 
			subdivider.addArc( c->npts, c->pts, curve->nuid );
		    } else {
			Quilt	   *quilt = curve->curve.o_nurbscurve->bezier_curves;
			Quiltspec  *qspec = quilt->qspec;
			REAL       *cpts  = quilt->cpts + qspec->offset;
			REAL       *cptsend = cpts + (qspec->width * qspec->order * qspec->stride);
			for( ; cpts != cptsend; cpts += qspec->order*qspec->stride ) 
			     subdivider.addArc( cpts, quilt, curve->nuid );
		    }
		}
		subdivider.endLoop();
	    }
	    subdivider.endTrims();
	}

	subdivider.beginQuilts();
	for( O_nurbssurface *n = currentSurface->o_nurbssurface; n; n = n->next ) 
	    subdivider.addQuilt( n->bezier_patches );
	subdivider.endQuilts();
        subdivider.drawSurfaces( currentSurface->nuid ); 
	if( ! playBack ) endrender();
    } else {
	if( ! playBack ) endrender();
	do_nurbserror( errval );
    }

    do_freeall( );
    resetObjects();
}

/*-----------------------------------------------------------------------------
 * do_freeall - free all data allocated in immediate mode
 *
 * Client:
 *-----------------------------------------------------------------------------
 */
void
NurbsTessellator::do_freeall( void )
{
    for( O_trim *o_trim = currentSurface->o_trim; o_trim; ) {
	O_trim *next_o_trim = o_trim->next;
        for( O_curve *curve = o_trim->o_curve; curve; ) {
	    O_curve *next_o_curve = curve->next;
	    do_freecurveall( curve );
	    curve = next_o_curve;
	}
	if( o_trim->save == 0 ) do_freebgntrim( o_trim );
	o_trim = next_o_trim;
    }

    O_nurbssurface *nurbss, *next_nurbss;
    for( nurbss= currentSurface->o_nurbssurface; nurbss; nurbss = next_nurbss) {
	next_nurbss = nurbss->next;
	if( nurbss->save == 0 )
	    do_freenurbssurface( nurbss );
	else
	    nurbss->used = 0;
    }

    if( currentSurface->save == 0 ) do_freebgnsurface( currentSurface );
}

void
NurbsTessellator::do_freecurveall( O_curve *curve )
{
    assert( curve->curvetype != ct_none );

    if( curve->curvetype == ct_nurbscurve ) {