44 lines
1.6 KiB
C++
44 lines
1.6 KiB
C++
// Copyright (C) 2010 Tim Moore moore@bricoworks.com
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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#include "project.hxx"
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#include <osg/Math>
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#include <osg/Matrixd>
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namespace simgear
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{
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GLint project(GLdouble objX, GLdouble objY, GLdouble objZ,
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const GLdouble *model, const GLdouble *proj, const GLint *view,
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GLdouble* winX, GLdouble* winY, GLdouble* winZ)
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{
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using namespace osg;
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Vec4d obj(objX, objY, objZ, 1.0);
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Matrixd Mmodel(model), Mproj(proj);
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Matrixd Mwin = (Matrixd::translate(1.0, 1.0, 1.0)
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* Matrixd::scale(0.5 * view[2], 0.5 * view[3], 0.5)
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* Matrixd::translate(view[0], view[1], 0.0));
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Vec4d result = obj * Mmodel * Mproj * Mwin;
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if (equivalent(result.w(), 0.0))
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return GL_FALSE;
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result = result / result.w();
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*winX = result.x(); *winY = result.y(); *winZ = result.z();
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return GL_TRUE;
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}
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}
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