...otherwise it fails to compile.
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com <http://www.skew-matrix.com/>
303 859 9466
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
*
* This library is open source and may be redistributed and/or modified under
* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
* (at your option) any later version. The full license is in LICENSE file
* included with this distribution, and on the openscenegraph.org website.
*
* 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
* OpenSceneGraph Public License for more details.
*/
#include <osgUtil/ReversePrimitiveFunctor>
#include <algorithm>
template <typename Type>
osg::PrimitiveSet * drawElementsTemplate(GLenum mode,GLsizei count, const
typename Type::value_type* indices)
{
if (indices==0 || count==0) return NULL;
Type * dePtr = new Type(mode);
Type & de = *dePtr;
de.reserve(count);
typedef const typename Type::value_type* IndexPointer;
switch(mode)
{
case(GL_TRIANGLES):
{
IndexPointer ilast = &indices[count];
for (IndexPointer iptr=indices; iptr<ilast; iptr+=3)
{
de.push_back(*(iptr));
de.push_back(*(iptr+2));
de.push_back(*(iptr+1));
}
break;
}
case (GL_QUADS):
{
IndexPointer ilast = &indices[count - 3];
for (IndexPointer iptr = indices; iptr<ilast; iptr+=4)
{
de.push_back(*(iptr));
de.push_back(*(iptr+3));
de.push_back(*(iptr+2));
de.push_back(*(iptr+1));
}
break;
}
case (GL_TRIANGLE_STRIP):
case (GL_QUAD_STRIP):
{
IndexPointer ilast = &indices[count];
for (IndexPointer iptr = indices; iptr<ilast; iptr+=2)
{
de.push_back(*(iptr+1));
de.push_back(*(iptr));
}
break;
}
case (GL_TRIANGLE_FAN):
{
de.push_back(*indices);
IndexPointer iptr = indices + 1;
IndexPointer ilast = &indices[count];
de.resize(count);
std::reverse_copy(iptr, ilast, de.begin() + 1);
break;
}
case (GL_POLYGON):
case (GL_POINTS):
case (GL_LINES):
case (GL_LINE_STRIP):
case (GL_LINE_LOOP):
{
IndexPointer iptr = indices;
IndexPointer ilast = &indices[count];
de.resize(count);
std::reverse_copy(iptr, ilast, de.begin());
break;
}
default:
break;
}
return &de;
}
namespace osgUtil {
void ReversePrimitiveFunctor::drawElements(GLenum mode,GLsizei count,const
GLubyte* indices)
{
_reversedPrimitiveSet = drawElementsTemplate<osg::DrawElementsUByte>(mode,
count, indices);
}
void ReversePrimitiveFunctor::drawElements(GLenum mode,GLsizei count,const
GLushort* indices)
{
_reversedPrimitiveSet = drawElementsTemplate<osg::DrawElementsUShort>(mode,
count, indices);
}
void ReversePrimitiveFunctor::drawElements(GLenum mode,GLsizei count,const
GLuint* indices)
{
_reversedPrimitiveSet = drawElementsTemplate<osg::DrawElementsUInt>(mode,
count, indices);
}
} // end osgUtil namespace
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