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add GLPickTri

This commit is contained in:
Paolo Cignoni 2005-09-15 15:44:52 +00:00
parent e6739a6a71
commit b5d9271a14
1 changed files with 103 additions and 0 deletions
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103
wrap/gl/pick.h
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@ -30,6 +30,107 @@
namespace vcg{
template <class MESH_TYPE>
class GLPickTri
{
typedef typename MESH_TYPE::FaceIterator FaceIterator;
typedef typename MESH_TYPE::FacePointer FacePointer;
typedef typename MESH_TYPE::VertexType VertexType;
public:
static bool PickNearestFace(int x, int y, MESH_TYPE &m, FaceIterator &fi,int width=4, int height=4)
{
std::vector<FacePointer> result;
int val=PickFace(x,y,m,result,width,height);
if(val!=0)
{
fi=result[0];
return true;
}
fi=0;
return false;
}
static int PickFace(int x, int y, MESH_TYPE &m, std::vector<FacePointer> &result, int width=4, int height=4)
{
result.clear();
long hits;
int sz=m.face.size()*5;
unsigned int *selectBuf =new unsigned int[sz];
// static unsigned int selectBuf[16384];
glSelectBuffer(sz, selectBuf);
glRenderMode(GL_SELECT);
glInitNames();
/* Because LoadName() won't work with no names on the stack */
glPushName(-1);
double mp[16];
int viewport[4];
glGetIntegerv(GL_VIEWPORT,viewport);
glMatrixMode(GL_PROJECTION);
glGetDoublev(GL_PROJECTION_MATRIX ,mp);
glPushMatrix();
glLoadIdentity();
//gluPickMatrix(x, viewport[3]-y, 4, 4, viewport);
gluPickMatrix(x, y, width, height, viewport);
glMultMatrixd(mp);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
int fcnt=0;
FaceIterator fi;
for(fi=m.face.begin();fi!=m.face.end();++fi)
{
if(!(*fi).IsD())
{
glLoadName(fcnt);
glBegin(GL_TRIANGLES);
glVertex( (*fi).V(0)->P() );
glVertex( (*fi).V(1)->P() );
glVertex( (*fi).V(2)->P() );
glEnd();
fcnt++;
}
}
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
hits = glRenderMode(GL_RENDER);
//xstring buf;
//if (hits <= 0) return 0;
std::vector< std::pair<double,unsigned int> > H;
for(int ii=0;ii<hits;ii++){
//TRACE("%ui %ui %ui %ui\n",selectBuf[ii*4],selectBuf[ii*4+1],selectBuf[ii*4+2],selectBuf[ii*4+3]);
H.push_back( std::pair<double,unsigned int>(selectBuf[ii*4+1]/4294967295.0,selectBuf[ii*4+3]));
}
std::sort(H.begin(),H.end());
// if(H.size()>0) TRACE("\n Closest is %i\n",H[0].second);
result.resize(H.size());
for(ii=0;ii<hits;ii++){
FaceIterator fi=m.face.begin();
advance(fi ,H[ii].second);
result[ii]=&*fi;
}
delete [] selectBuf;
return result.size();
}
};
//////////////////////////////////////////////////////////////////////////
template <class TETRA_MESH_TYPE>
class GLPickTetra
{
@ -221,4 +322,6 @@ static int PickTetraFace(int x, int y, TETRA_MESH_TYPE &m, std::vector<std::pair
}
};
}