+++ /dev/null
-/*
-** 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.
-*/
-
-/*
- * curve.c++
- *
- */
-
-#include "glimports.h"
-#include "myassert.h"
-#include "mystdio.h"
-#include "mymath.h"
-#include "curve.h"
-#include "mapdesc.h"
-#include "types.h"
-#include "quilt.h"
-#include "nurbsconsts.h"
-
-/*--------------------------------------------------------------------------
- * Curve::Curve - copy curve from quilt and transform control points
- *--------------------------------------------------------------------------
- */
-
-Curve::Curve( Quilt_ptr geo, REAL pta, REAL ptb, Curve *c )
-{
- mapdesc = geo->mapdesc;
- next = c;
- needsSampling = mapdesc->isRangeSampling() ? 1 : 0;
- cullval = mapdesc->isCulling() ? CULL_ACCEPT : CULL_TRIVIAL_ACCEPT;
- order = geo->qspec[0].order;
- stride = MAXCOORDS;
- for( int i = 0; i < MAXORDER * MAXCOORDS; i++ ) {
- cpts[i] = 0;
- spts[i] = 0;
- }
- stepsize = 0;
- minstepsize = 0;
-
- REAL *ps = geo->cpts;
- Quiltspec_ptr qs = geo->qspec;
- ps += qs->offset;
- ps += qs->index * qs->order * qs->stride;
-
- if( needsSampling )
- mapdesc->xformSampling( ps, qs->order, qs->stride, spts, stride );
-
- if( cullval == CULL_ACCEPT )
- mapdesc->xformCulling( ps, qs->order, qs->stride, cpts, stride );
-
- /* set untrimmed curve range */
- range[0] = qs->breakpoints[qs->index];
- range[1] = qs->breakpoints[qs->index+1];
- range[2] = range[1] - range[0];
-
- if( range[0] != pta ) {
- Curve lower( *this, pta, 0 );
- lower.next = next;
- *this = lower;
- }
- if( range[1] != ptb ) {
- Curve lower( *this, ptb, 0 );
- }
-}
-
-/*--------------------------------------------------------------------------
- * Curve::Curve - subdivide a curve along an isoparametric line
- *--------------------------------------------------------------------------
- */
-
-Curve::Curve( Curve& upper, REAL value, Curve *c )
-{
- Curve &lower = *this;
-
- lower.next = c;
- lower.mapdesc = upper.mapdesc;
- lower.needsSampling = upper.needsSampling;
- lower.order = upper.order;
- lower.stride = upper.stride;
- lower.cullval = upper.cullval;
-
- REAL d = (value - upper.range[0]) / upper.range[2];
-
- if( needsSampling )
- mapdesc->subdivide( upper.spts, lower.spts, d, upper.stride, upper.order );
-
- if( cullval == CULL_ACCEPT )
- mapdesc->subdivide( upper.cpts, lower.cpts, d, upper.stride, upper.order );
-
- lower.range[0] = upper.range[0];
- lower.range[1] = value;
- lower.range[2] = value - upper.range[0];
- upper.range[0] = value;
- upper.range[2] = upper.range[1] - value;
-}
-
-
-/*--------------------------------------------------------------------------
- * Curve::clamp - clamp the sampling rate to a given maximum
- *--------------------------------------------------------------------------
- */
-
-void
-Curve::clamp( void )
-{
- if( stepsize < minstepsize )
- stepsize = mapdesc->clampfactor * minstepsize;
-}
-
-void
-Curve::setstepsize( REAL max )
-{
- stepsize = ( max >= 1.0 ) ? (range[2] / max) : range[2];
- minstepsize = stepsize;
-}
-
-void
-Curve::getstepsize( void )
-{
- minstepsize= 0;
-
- if( mapdesc->isConstantSampling() ) {
- // fixed number of samples per patch in each direction
- // maxrate is number of s samples per patch
- setstepsize( mapdesc->maxrate );
- } else if( mapdesc->isDomainSampling() ) {
- // maxrate is number of s samples per unit s length of domain
- setstepsize( mapdesc->maxrate * range[2] );
- } else {
- // upper bound on path length between sample points
-
- assert( order <= MAXORDER );
-
- /* points have been transformed, therefore they are homogeneous */
- REAL tmp[MAXORDER][MAXCOORDS];
- const int tstride = sizeof(tmp[0]) / sizeof(REAL);
- int val = mapdesc->project( spts, stride, &tmp[0][0], tstride, order );
-
- if( val == 0 ) {
- // control points cross infinity, therefore derivatives are undefined
- setstepsize( mapdesc->maxrate );
- } else {
- REAL t = mapdesc->getProperty( N_PIXEL_TOLERANCE );
- if( mapdesc->isParametricDistanceSampling() ) {
- REAL d = mapdesc->calcPartialVelocity( &tmp[0][0], tstride, order, 2, range[2] );
- stepsize = (d > 0.0) ? sqrtf( 8.0 * t / d ) : range[2];
- minstepsize = ( mapdesc->maxrate > 0.0 ) ? (range[2] / mapdesc->maxrate) : 0.0;
- } else if( mapdesc->isPathLengthSampling() ) {
- // t is upper bound on path (arc) length
- REAL d = mapdesc->calcPartialVelocity( &tmp[0][0], tstride, order, 1, range[2] );
- stepsize = ( d > 0.0 ) ? (t / d) : range[2];
- minstepsize = ( mapdesc->maxrate > 0.0 ) ? (range[2] / mapdesc->maxrate) : 0.0;
- } else {
- // control points cross infinity, therefore partials are undefined
- setstepsize( mapdesc->maxrate );
- }
- }
- }
-}
-
-int
-Curve::needsSamplingSubdivision( void )
-{
- return ( stepsize < minstepsize ) ? 1 : 0;
-}
-
-int
-Curve::cullCheck( void )
-{
- if( cullval == CULL_ACCEPT )
- cullval = mapdesc->cullCheck( cpts, order, stride );
- return cullval;
-}
-
projects / mesa.git / blobdiff