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More clean up for synch with 0.8.42

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This commit is contained in:
Don BURNS
2001-09-19 21:19:47 +00:00
parent 2462c6273c
commit 7e81f6cfa6
292 changed files with 39673 additions and 0 deletions
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262
src/osgUtil/Tesselator.cpp Normal file
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#include <osg/GL>
#include <osg/Notify>
#include <osgUtil/Tesselator>
#include <GL/glu.h>
using namespace osg;
using namespace osgUtil;
/* Win32 calling conventions. (or a least thats what the GLUT example tess.c uses.)*/
#ifndef CALLBACK
#define CALLBACK
#endif
static Tesselator* s_tesselator = NULL;
void CALLBACK beginCallback(GLenum which)
{
s_tesselator->beginPrimitive(which);
}
void CALLBACK errorCallback(GLenum errorCode)
{
s_tesselator->_errorCode = errorCode;
}
void CALLBACK endCallback()
{
s_tesselator->endPrimitive();
}
void CALLBACK vertexCallback(GLvoid *data)
{
Tesselator::VertexIndexSet* vip = (Tesselator::VertexIndexSet*)data;
vip->accumulate();
}
Tesselator::Tesselator()
{
}
Tesselator::~Tesselator()
{
}
void Tesselator::tesselate(osg::Vec3* coords,int numIndices, int* indices,InputBoundaryDirection ibd)
{
init();
_coordVec.reserve(numIndices);
if (ibd==COUNTER_CLOCK_WISE)
{
for(int i=0;i<numIndices;++i)
{
_coordVec.push_back(VertexIndexSet(this,coords[indices[i]],indices[i]));
}
}
else
{
for(int i=numIndices-1;i>=0;--i)
{
_coordVec.push_back(VertexIndexSet(this,coords[indices[i]],indices[i]));
}
}
do_it();
}
void Tesselator::tesselate(osg::Vec3* coords,int numIndices, osg::ushort* indices,InputBoundaryDirection ibd)
{
init();
_coordVec.reserve(numIndices);
if (ibd==COUNTER_CLOCK_WISE)
{
for(int i=0;i<numIndices;++i)
{
_coordVec.push_back(VertexIndexSet(this,coords[indices[i]],indices[i]));
}
}
else
{
for(int i=numIndices-1;i>=0;--i)
{
_coordVec.push_back(VertexIndexSet(this,coords[indices[i]],indices[i]));
}
}
do_it();
}
void Tesselator::tesselate(osg::Vec3* coords,int numIndices, osg::uint* indices,InputBoundaryDirection ibd)
{
init();
_coordVec.reserve(numIndices);
if (ibd==COUNTER_CLOCK_WISE)
{
for(int i=0;i<numIndices;++i)
{
_coordVec.push_back(VertexIndexSet(this,coords[indices[i]],indices[i]));
}
}
else
{
for(int i=numIndices-1;i>=0;--i)
{
_coordVec.push_back(VertexIndexSet(this,coords[indices[i]],indices[i]));
}
}
do_it();
}
void Tesselator::init()
{
_errorCode = 0;
_coordVec.clear();
_acummulated_indices.clear();
_tesselated_indices.clear();
_currentPrimtiveType=0;
}
#ifdef GLU_VERSION_1_2
void Tesselator::do_it()
{
GLUtesselator *tobj = gluNewTess();
gluTessCallback(tobj, (GLenum)GLU_TESS_VERTEX,
(GLvoid (CALLBACK*) ()) (&vertexCallback));
gluTessCallback(tobj, (GLenum)GLU_TESS_BEGIN,
(GLvoid (CALLBACK*) ()) (&beginCallback));
gluTessCallback(tobj, (GLenum)GLU_TESS_END,
(GLvoid (CALLBACK*) ()) (&endCallback));
gluTessCallback(tobj, (GLenum)GLU_TESS_ERROR,
(GLvoid (CALLBACK*) ()) (&errorCallback));
s_tesselator = this;
gluTessBeginPolygon(tobj,NULL);
gluTessBeginContour(tobj);
for(CoordVec::iterator itr=_coordVec.begin();
itr!=_coordVec.end();
++itr)
{
gluTessVertex(tobj,itr->_vertex,itr->_vertex);
}
gluTessEndContour(tobj);
gluTessEndPolygon(tobj);
gluDeleteTess(tobj);
if (_errorCode!=0)
{
const GLubyte *estring = gluErrorString((GLenum)_errorCode);
osg::notify(osg::WARN)<<"Tessellation Error: "<<estring<<endl;
osg::notify(osg::WARN)<<" Num indices created = "<<_tesselated_indices.size()<<endl;
}
}
#else
// old style glu tesseleation.
void Tesselator::do_it()
{
GLUtriangulatorObj *tobj = gluNewTess();
gluTessCallback(tobj, (GLenum)GLU_VERTEX,
(GLvoid (CALLBACK*) ()) (&vertexCallback));
gluTessCallback(tobj, (GLenum)GLU_BEGIN,
(GLvoid (CALLBACK*) ()) (&beginCallback));
gluTessCallback(tobj, (GLenum)GLU_END,
(GLvoid (CALLBACK*) ()) (&endCallback));
gluTessCallback(tobj, (GLenum)GLU_ERROR,
(GLvoid (CALLBACK*) ()) (&errorCallback));
s_tesselator = this;
gluBeginPolygon(tobj);
for(CoordVec::iterator itr=_coordVec.begin();
itr!=_coordVec.end();
++itr)
{
gluTessVertex(tobj,itr->_vertex,itr->_vertex);
}
gluEndPolygon(tobj);
gluDeleteTess(tobj);
if (_errorCode!=0)
{
const GLubyte *estring = gluErrorString((GLenum)_errorCode);
osg::notify(osg::WARN)<<"Tessellation Error: "<<estring<<endl;
osg::notify(osg::WARN)<<" Num indices created = "<<_tesselated_indices.size()<<endl;
}
}
#endif
void Tesselator::beginPrimitive(int primitiveType)
{
_currentPrimtiveType = primitiveType;
}
void Tesselator::endPrimitive()
{
if (_acummulated_indices.size()>=3)
{
switch(_currentPrimtiveType)
{
case(GL_TRIANGLE_FAN):
{
osg::uint first = _acummulated_indices[0];
for(unsigned int i=2;i<_acummulated_indices.size();++i)
{
_tesselated_indices.push_back(first);
_tesselated_indices.push_back(_acummulated_indices[i-1]);
_tesselated_indices.push_back(_acummulated_indices[i]);
}
}
break;
case(GL_TRIANGLE_STRIP):
{
for(unsigned int i=2;i<_acummulated_indices.size();++i)
{
if (i%2)
{
// i == 3,5,7 etc
// add in order.
_tesselated_indices.push_back(_acummulated_indices[i-2]);
_tesselated_indices.push_back(_acummulated_indices[i-1]);
_tesselated_indices.push_back(_acummulated_indices[i]);
}
else
{
// i == 2,4,6 etc
// add in flipping orde to preserve anticlockwise direction.
_tesselated_indices.push_back(_acummulated_indices[i-1]);
_tesselated_indices.push_back(_acummulated_indices[i-2]);
_tesselated_indices.push_back(_acummulated_indices[i]);
}
}
}
break;
case(GL_TRIANGLES):
{
for(unsigned int i=2;i<_acummulated_indices.size();i+=3)
{
_tesselated_indices.push_back(_acummulated_indices[i-2]);
_tesselated_indices.push_back(_acummulated_indices[i-1]);
_tesselated_indices.push_back(_acummulated_indices[i]);
}
}
break;
}
}
_acummulated_indices.clear();
}