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/*
*
* Copyright (C) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/NoticeExplan/
*
*/
/*
* Copyright (C) 1990,91 Silicon Graphics, Inc.
*
_______________________________________________________________________
______________ S I L I C O N G R A P H I C S I N C . ____________
|
| $Revision $
|
| Classes:
| _SoNurbsCurveRender
|
| Author(s) : Dave Immel
|
______________ S I L I C O N G R A P H I C S I N C . ____________
_______________________________________________________________________
*/
#include <GL/gl.h>
#include <math.h>
#include <stdlib.h>
#include "SoAddPrefix.h"
#include "SoCurveRender.h"
#include "SoCurveRenderEval.h"
#include "SoCurveMaps.h"
_SoNurbsCurveRender::_SoNurbsCurveRender()
: _SoNurbsNurbsTessellator(curveEvaluator, surfaceEvaluator)
{
curveEvaluator.initialize ();
redefineMaps();
defineMap( N_V3D, 0, 3 );
defineMap( N_V3DR, 1, 4 );
}
_SoNurbsCurveRender::~_SoNurbsCurveRender()
{
}
void
_SoNurbsCurveRender::loadMatrices( SbMatrix &mat )
{
loadCullingMatrix( mat );
//
// Check the method of sampling the NURBS surface. If it is an
// object space tessellation, then a sampling matrix does not
// need to be loaded.
//
INREAL samplingMethod;
getnurbsproperty( N_V3D, N_SAMPLINGMETHOD, &samplingMethod );
if (samplingMethod != N_FIXEDRATE)
loadSamplingMatrix( mat );
}
void
_SoNurbsCurveRender::loadSamplingMatrix( SbMatrix &vmat )
{
float xsize, ysize;
INREAL smat[4][4];
GLint vpParams[4];
::glGetIntegerv(GL_VIEWPORT, vpParams);
/* rescale the mapping to correspond to pixels in x/y */
xsize = 0.5 * (float) (vpParams[2]);
ysize = 0.5 * (float) (vpParams[3]);
smat[0][0] = vmat[0][0] * xsize;
smat[1][0] = vmat[1][0] * xsize;
smat[2][0] = vmat[2][0] * xsize;
smat[3][0] = vmat[3][0] * xsize;
smat[0][1] = vmat[0][1] * ysize;
smat[1][1] = vmat[1][1] * ysize;
smat[2][1] = vmat[2][1] * ysize;
smat[3][1] = vmat[3][1] * ysize;
smat[0][2] = vmat[0][2];
smat[1][2] = vmat[1][2];
smat[2][2] = vmat[2][2];
smat[3][2] = vmat[3][2];
smat[0][3] = vmat[0][3];
smat[1][3] = vmat[1][3];
smat[2][3] = vmat[2][3];
smat[3][3] = vmat[3][3];
setnurbsproperty( N_V3D, N_SAMPLINGMATRIX, &smat[0][0], 4, 1);
setnurbsproperty( N_V3DR, N_SAMPLINGMATRIX, &smat[0][0], 4, 1);
}
void
_SoNurbsCurveRender::loadCullingMatrix( SbMatrix &vmat )
{
INREAL cmat[4][4];
cmat[0][0] = vmat[0][0];
cmat[0][1] = vmat[0][1];
cmat[0][2] = vmat[0][2];
cmat[0][3] = vmat[0][3];
cmat[1][0] = vmat[1][0];
cmat[1][1] = vmat[1][1];
cmat[1][2] = vmat[1][2];
cmat[1][3] = vmat[1][3];
cmat[2][0] = vmat[2][0];
cmat[2][1] = vmat[2][1];
cmat[2][2] = vmat[2][2];
cmat[2][3] = vmat[2][3];
cmat[3][0] = vmat[3][0];
cmat[3][1] = vmat[3][1];
cmat[3][2] = vmat[3][2];
cmat[3][3] = vmat[3][3];
setnurbsproperty( N_V3D, N_CULLINGMATRIX, &cmat[0][0], 4, 1);
setnurbsproperty( N_V3DR, N_CULLINGMATRIX, &cmat[0][0], 4, 1);
}
void
_SoNurbsCurveRender::getVertices( int32_t &nVerts, SbVec2f *&verts )
{
curveEvaluator.getVertices (nVerts, verts);
}
|