quilt.cc

Go to the documentation of this file.

/*
** 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.
*/
 
/*
 * quilt.c++
 *
 */
 
//#include "glimports.h"
//#include "mystdio.h"
//#include "myassert.h"
#include "quilt.h"
#include "backend.h"
#include "mapdesc.h"
#include "flist.h"
#include "patchlist.h"
#include "simplemath.h" //min()
 
/* local preprocessor definitions */
#define DEF_PATCH_STEPSIZE  .4
#define fsizeof(x)      (sizeof(x)/sizeof(REAL))
 
 
Quilt::Quilt( Mapdesc *_mapdesc )
{
    mapdesc = _mapdesc;
}
 
void
Quilt::deleteMe( Pool& p )
{
    for( Quiltspec *q=qspec; q != eqspec; q++ ) {
#if 1
    if( q->breakpoints) delete[] q->breakpoints;
    q->breakpoints = 0;
#else
    if( q->breakpoints) {
       delete[] q->breakpoints;  
       q->breakpoints = 0;
printf("in here\n");
        }
#endif
    }
    if( cpts ) delete[] cpts;  
    cpts = 0;
    PooledObj::deleteMe( p );
}
 
void
Quilt::show( void )
{
#ifndef NDEBUG
    int nc = mapdesc->getNcoords();
    REAL *ps  = cpts; 
    ps += qspec[0].offset;
    ps += qspec[1].offset;
    for( int i=0; i!= qspec[0].order * qspec[0].width; i++ ) {
    for( int j = 0; j!= qspec[1].order * qspec[1].width; j++ ) {
        for( int k=0; k < nc; k++ )
        _glu_dprintf(  "%g ", ps[i*qspec[0].stride + j*qspec[1].stride + k] );
        _glu_dprintf(  "\n" );
    }
    _glu_dprintf(  "\n" );
    }
    _glu_dprintf( "\n" );
#endif
}
 
/*--------------------------------------------------------------------------
 * Quilt::select - find which map in each quilt contains the points
 *          pta and ptb with pta[i] < ptb[i]
 *--------------------------------------------------------------------------
 */
 
void
Quilt::select( REAL *pta, REAL *ptb )
{
    int dim = eqspec - qspec; 
    int i, j;
    for( i=0; i<dim; i++) {
    for( j=qspec[i].width-1; j>=0; j-- )
        if( (qspec[i].breakpoints[j] <= pta[i]   ) &&
            (ptb[i] <= qspec[i].breakpoints[j+1] ) ) 
         break;
    assert( j != -1 ); 
    qspec[i].index = j;
    }
}
 
void 
Quilt::download( Backend &backend )
{
    if( getDimension() == 2 ) {
    REAL *ps  = cpts; 
    ps += qspec[0].offset;
    ps += qspec[1].offset;
    ps += qspec[0].index * qspec[0].order * qspec[0].stride;
    ps += qspec[1].index * qspec[1].order * qspec[1].stride;
    backend.surfpts( mapdesc->getType(), ps, 
          qspec[0].stride,
          qspec[1].stride,
          qspec[0].order,
          qspec[1].order,
          qspec[0].breakpoints[qspec[0].index],
          qspec[0].breakpoints[qspec[0].index+1],
          qspec[1].breakpoints[qspec[1].index],
          qspec[1].breakpoints[qspec[1].index+1] );
    } else {
    REAL *ps  = cpts; 
    ps += qspec[0].offset;
    ps += qspec[0].index * qspec[0].order * qspec[0].stride;
    backend.curvpts( mapdesc->getType(), ps, 
              qspec[0].stride,
              qspec[0].order,
              qspec[0].breakpoints[qspec[0].index],
              qspec[0].breakpoints[qspec[0].index+1] );
    }
}
 
/*--------------------------------------------------------------------------
 * Quilt::downloadAll - download each map that contains the current patch
 *--------------------------------------------------------------------------
 */
 
void
Quilt::downloadAll( REAL *pta, REAL *ptb, Backend &backend )
{
    for( Quilt *m = this; m; m=m->next ) {
    m->select( pta, ptb );
    m->download( backend );
    }
}
 
/*--------------------------------------------------------------------------
  * Quilt::isCulled - determine if an entire quilt is trivially rejected.
 *--------------------------------------------------------------------------
 */
 
int
Quilt::isCulled( void )
{
    if( mapdesc->isCulling() )
    return mapdesc->xformAndCullCheck( cpts + qspec[0].offset + qspec[1].offset,
            qspec[0].order * qspec[0].width, qspec[0].stride, 
            qspec[1].order * qspec[1].width, qspec[1].stride );
    else
    return CULL_ACCEPT;
}
 
/*---------------------------------------------------------------------------
 * Quilt::getRange - retrieve the valid paramater range of a set of quilts
 *---------------------------------------------------------------------------
 */
void
Quilt::getRange( REAL *from, REAL *to, Flist& slist, Flist &tlist )
{
    getRange( from, to, 0, slist );
    getRange( from, to, 1, tlist );
}
 
/*---------------------------------------------------------------------------
 * Quilt::getRange - retrieve the valid paramater range of a set of quilts
 *---------------------------------------------------------------------------
 */
void
Quilt::getRange( REAL *from, REAL *to, int i, Flist &list )
{
    Quilt *maps = this;
    from[i] = maps->qspec[i].breakpoints[0];
    to[i]   = maps->qspec[i].breakpoints[maps->qspec[i].width];
    int maxpts = 0;
    Quilt_ptr m;    
    for( m=maps; m; m=m->next ) {
    if( m->qspec[i].breakpoints[0] > from[i] ) 
        from[i] = m->qspec[i].breakpoints[0]; 
    if( m->qspec[i].breakpoints[m->qspec[i].width] < to[i] ) 
        to[i] = m->qspec[i].breakpoints[m->qspec[i].width]; 
    maxpts += m->qspec[i].width + 1;
    }
 
    list.grow( maxpts );
 
    for( m=maps; m; m=m->next )
    for( int j=0; j<=m->qspec[i].width; j++ ) {
        list.add( m->qspec[i].breakpoints[j] );
    }
 
    list.filter( );
    list.taper( from[i], to[i] );
}
 
void
Quilt::getRange( REAL *from, REAL *to, Flist& slist )
{
    getRange( from, to, 0, slist );
}
 
void
Quilt::findRates( Flist& slist, Flist& tlist, REAL rate[2] )
{
    findSampleRates( slist, tlist );
    rate[0] = qspec[0].step_size;
    rate[1] = qspec[1].step_size;
 
    for( Quilt *q = next; q; q = q->next ) {
    q->findSampleRates( slist, tlist );
    if( q->qspec[0].step_size < rate[0] ) 
        rate[0] = q->qspec[0].step_size;
    if( q->qspec[1].step_size < rate[1] ) 
        rate[1] = q->qspec[1].step_size;
    }
}
 
void
Quilt::findSampleRates( Flist& slist, Flist& tlist )
{
    qspec[0].step_size = DEF_PATCH_STEPSIZE * 
        (qspec[0].breakpoints[qspec[0].width] - qspec[0].breakpoints[0]); 
    qspec[1].step_size = DEF_PATCH_STEPSIZE * 
        (qspec[1].breakpoints[qspec[1].width] - qspec[1].breakpoints[0]); 
 
    for( int i = slist.start; i < slist.end-1; i++ ) {
    for( int j = tlist.start; j < tlist.end-1; j++ ) {
 
        REAL pta[2], ptb[2];
        pta[0] = slist.pts[i];
        ptb[0] = slist.pts[i+1];
        pta[1] = tlist.pts[j];
        ptb[1] = tlist.pts[j+1];
        Patchlist patchlist( this, pta, ptb );
        patchlist.getstepsize();
        
        {
        float edge_len_s = min(glu_abs(ptb[0]-pta[0]),1.0);
        float edge_len_t = min(glu_abs(ptb[1]-pta[1]),1.0);
 
        if( patchlist.getStepsize(0)/edge_len_s < qspec[0].step_size ) 
           qspec[0].step_size = patchlist.getStepsize(0)/edge_len_s;
        if( patchlist.getStepsize(1)/edge_len_t < qspec[1].step_size ) 
          qspec[1].step_size = patchlist.getStepsize(1)/edge_len_t;
        }
    }
    }
}