mirror of
https://github.com/OPM/ResInsight.git
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223 lines
7.2 KiB
C++
223 lines
7.2 KiB
C++
//##################################################################################################
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//
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// Custom Visualization Core library
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// Copyright (C) 2011-2013 Ceetron AS
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//
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// This library may be used under the terms of either the GNU General Public License or
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// the GNU Lesser General Public License as follows:
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//
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// GNU General Public License Usage
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// This library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (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, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>>
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// for more details.
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//
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// GNU Lesser General Public License Usage
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation; either version 2.1 of the License, or
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// (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, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.
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//
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// See the GNU Lesser General Public License at <<http://www.gnu.org/licenses/lgpl-2.1.html>>
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// for more details.
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//
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//##################################################################################################
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#include "cvfBase.h"
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#include "cvfAssert.h"
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#include "cvfMath.h"
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#include "cvfPrimitiveSet.h"
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#include "cvfOpenGL.h"
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namespace cvf {
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//==================================================================================================
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///
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/// \class cvf::PrimitiveSet
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/// \ingroup Render
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///
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///
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///
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//==================================================================================================
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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PrimitiveSet::PrimitiveSet(PrimitiveType primitiveType)
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: m_primitiveType(primitiveType)
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{
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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PrimitiveType PrimitiveSet::primitiveType() const
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{
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return m_primitiveType;
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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cvfGLenum PrimitiveSet::primitiveTypeOpenGL() const
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{
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switch (m_primitiveType)
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{
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case PT_POINTS: return GL_POINTS;
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case PT_LINES: return GL_LINES;
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case PT_LINE_LOOP: return GL_LINE_LOOP;
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case PT_LINE_STRIP: return GL_LINE_STRIP;
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case PT_TRIANGLES: return GL_TRIANGLES;
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case PT_TRIANGLE_STRIP: return GL_TRIANGLE_STRIP;
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case PT_TRIANGLE_FAN: return GL_TRIANGLE_FAN;
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default: CVF_FAIL_MSG("Unhandled primitive type");
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}
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return UNDEFINED_UINT;
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}
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//--------------------------------------------------------------------------------------------------
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/// Returns the number of triangles in this primitive group
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//--------------------------------------------------------------------------------------------------
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size_t PrimitiveSet::triangleCount() const
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{
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if (m_primitiveType != PT_TRIANGLES)
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{
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return 0;
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}
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CVF_ASSERT(indexCount()%3 == 0);
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return indexCount()/3;
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}
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//--------------------------------------------------------------------------------------------------
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///
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//--------------------------------------------------------------------------------------------------
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size_t PrimitiveSet::faceCount() const
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{
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switch (m_primitiveType)
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{
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case PT_POINTS: return indexCount();
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case PT_LINES: return indexCount()/2;
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case PT_LINE_LOOP: return indexCount();
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case PT_LINE_STRIP: return indexCount() - 1;
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case PT_TRIANGLES: return triangleCount();
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case PT_TRIANGLE_STRIP: return indexCount() - 2;
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case PT_TRIANGLE_FAN: return indexCount() - 2;
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default: CVF_FAIL_MSG("Unhandled primitive type");
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}
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return 0;
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}
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//--------------------------------------------------------------------------------------------------
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/// Gets connectivity for one face in this primitive set
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///
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/// The indices array will be populated with the connectivities for the specified face.
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/// The connectivity table will have 1, 2, 3 or 4 entries. If this primitive set consists
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/// of a triangle fan, triangles will be returned. In a similar fashion, if the primitive set
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/// consist of a quad strip, quads will be returned.
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//--------------------------------------------------------------------------------------------------
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void PrimitiveSet::getFaceIndices(size_t indexOfFace, UIntArray* indices) const
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{
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CVF_TIGHT_ASSERT(indexOfFace < faceCount());
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CVF_TIGHT_ASSERT(indices);
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indices->setSizeZero();
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if (m_primitiveType == PT_POINTS)
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{
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indices->reserve(1);
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indices->add(index(indexOfFace));
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}
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else if (m_primitiveType == PT_LINES)
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{
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indices->reserve(2);
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indices->add(index(2*indexOfFace));
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indices->add(index(2*indexOfFace + 1));
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}
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else if (m_primitiveType == PT_LINE_LOOP)
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{
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indices->reserve(2);
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if (indexOfFace == faceCount() - 1)
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{
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indices->add(index(indexOfFace));
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indices->add(index(0));
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}
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else
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{
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indices->add(index(indexOfFace));
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indices->add(index(indexOfFace + 1));
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}
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}
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else if (m_primitiveType == PT_LINE_STRIP)
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{
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indices->reserve(2);
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indices->add(index(indexOfFace));
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indices->add(index(indexOfFace + 1));
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}
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else if (m_primitiveType == PT_TRIANGLES)
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{
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indices->reserve(3);
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const size_t baseIdx = 3*indexOfFace;
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indices->add(index(baseIdx));
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indices->add(index(baseIdx + 1));
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indices->add(index(baseIdx + 2));
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}
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else if (m_primitiveType == PT_TRIANGLE_FAN)
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{
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indices->reserve(3);
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indices->add(index(0));
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indices->add(index(indexOfFace + 1));
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indices->add(index(indexOfFace + 2));
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}
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else if (m_primitiveType == PT_TRIANGLE_STRIP)
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{
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indices->reserve(3);
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if (indexOfFace % 2 == 0)
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{
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indices->add(index(indexOfFace));
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indices->add(index(indexOfFace + 1));
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indices->add(index(indexOfFace + 2));
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}
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else
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{
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indices->add(index(indexOfFace + 1));
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indices->add(index(indexOfFace));
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indices->add(index(indexOfFace + 2));
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}
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}
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else
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{
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CVF_FAIL_MSG("Not implemented");
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}
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}
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} // namespace cvf
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