| /* |
| ** 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. |
| */ |
| |
| /* |
| * curvesub.c++ |
| * |
| * $Date: 2012/03/29 17:22:18 $ $Revision: 1.1.1.1 $ |
| * $Header: /cvs/bao-parsec/pkgs/libs/mesa/src/src/glu/sgi/libnurbs/internals/curvesub.cc,v 1.1.1.1 2012/03/29 17:22:18 uid42307 Exp $ |
| */ |
| |
| #include "glimports.h" |
| #include "myassert.h" |
| #include "mystdio.h" |
| #include "subdivider.h" |
| #include "renderhints.h" |
| #include "backend.h" |
| #include "quilt.h" |
| #include "curvelist.h" |
| #include "curve.h" |
| #include "nurbsconsts.h" |
| |
| /*-------------------------------------------------------------------------- |
| * drawCurves - main curve rendering entry point |
| *-------------------------------------------------------------------------- |
| */ |
| |
| void |
| Subdivider::drawCurves( void ) |
| { |
| REAL from[1], to[1]; |
| Flist bpts; |
| qlist->getRange( from, to, bpts ); |
| |
| renderhints.init( ); |
| |
| backend.bgncurv(); |
| for( int i=bpts.start; i<bpts.end-1; i++ ) { |
| REAL pta, ptb; |
| pta = bpts.pts[i]; |
| ptb = bpts.pts[i+1]; |
| |
| qlist->downloadAll( &pta, &ptb, backend ); |
| |
| Curvelist curvelist( qlist, pta, ptb ); |
| samplingSplit( curvelist, renderhints.maxsubdivisions ); |
| } |
| backend.endcurv(); |
| } |
| |
| |
| /*-------------------------------------------------------------------------- |
| * samplingSplit - recursively subdivide patch, cull check each subpatch |
| *-------------------------------------------------------------------------- |
| */ |
| |
| void |
| Subdivider::samplingSplit( Curvelist& curvelist, int subdivisions ) |
| { |
| if( curvelist.cullCheck() == CULL_TRIVIAL_REJECT ) return; |
| |
| curvelist.getstepsize(); |
| |
| if( curvelist.needsSamplingSubdivision() && (subdivisions > 0) ) { |
| REAL mid = ( curvelist.range[0] + curvelist.range[1] ) * 0.5; |
| Curvelist lowerlist( curvelist, mid ); |
| samplingSplit( lowerlist, subdivisions-1 ); // lower |
| samplingSplit( curvelist, subdivisions-1 ); // upper |
| } else { |
| long nu = 1 + ((long) (curvelist.range[2] / curvelist.stepsize)); |
| backend.curvgrid( curvelist.range[0], curvelist.range[1], nu ); |
| backend.curvmesh( 0, nu ); |
| } |
| } |
| |