void PtexTriangleFilter::applyAcrossEdge(PtexTriangleKernel& k,
const Ptex::FaceInfo& f, int eid)
{
int afid = f.adjface(eid), aeid = f.adjedge(eid);
const Ptex::FaceInfo& af = _tx->getFaceInfo(afid);
k.reorient(eid, aeid);
splitAndApply(k, afid, af);
}
void PtexTriangleFilter::splitAndApply(PtexTriangleKernel& k, int faceid, const Ptex::FaceInfo& f)
{
// do we need to split? if so, split kernel and apply across edge(s)
if (k.u1 < 0 && f.adjface(2) >= 0) {
PtexTriangleKernel ka;
k.splitU(ka);
applyAcrossEdge(ka, f, 2);
}
if (k.v1 < 0 && f.adjface(0) >= 0) {
PtexTriangleKernel ka;
k.splitV(ka);
applyAcrossEdge(ka, f, 0);
}
if (k.w1 < 0 && f.adjface(1) >= 0) {
PtexTriangleKernel ka;
k.splitW(ka);
applyAcrossEdge(ka, f, 1);
}
// apply to local face
apply(k, faceid, f);
}
void PtexSeparableFilter::applyAcrossEdge(PtexSeparableKernel& k,
int faceid, const Ptex::FaceInfo& f, int eid)
{
int afid = f.adjface(eid), aeid = f.adjedge(eid);
const Ptex::FaceInfo* af = &_tx->getFaceInfo(afid);
int rot = eid - aeid + 2;
// adjust uv coord and res for face/subface boundary
bool fIsSubface = f.isSubface(), afIsSubface = af->isSubface();
if (fIsSubface != afIsSubface) {
if (afIsSubface) {
// main face to subface transition
// adjust res and offset uv coord for primary subface
bool primary = k.adjustMainToSubface(eid);
if (!primary) {
// advance ajacent face and edge id to secondary subface
int neid = (aeid + 3) % 4;
afid = af->adjface(neid);
aeid = af->adjedge(neid);
af = &_tx->getFaceInfo(afid);
rot += neid - aeid + 2;
}
}
else {
// subface to main face transition
// Note: the transform depends on which subface the kernel is
// coming from. The "primary" subface is the one the main
// face is pointing at. The secondary subface adjustment
// happens to be the same as for the primary subface for the
// next edge, so the cases can be combined.
bool primary = (af->adjface(aeid) == faceid);
k.adjustSubfaceToMain(eid - primary);
}
}
// rotate and apply (resplit if going to a subface)
k.rotate(rot);
if (afIsSubface) splitAndApply(k, afid, *af);
else apply(k, afid, *af);
}
void PtexSeparableFilter::splitAndApply(PtexSeparableKernel& k, int faceid, const Ptex::FaceInfo& f)
{
// do we need to split? (i.e. does kernel span an edge?)
bool splitR = (k.u+k.uw > k.res.u()), splitL = (k.u < 0);
bool splitT = (k.v+k.vw > k.res.v()), splitB = (k.v < 0);
#ifdef NOEDGEBLEND
// for debugging only
if (splitR) k.mergeR(_uMode);
if (splitL) k.mergeL(_uMode);
if (splitT) k.mergeT(_vMode);
if (splitB) k.mergeB(_vMode);
#else
if (splitR || splitL || splitT || splitB) {
PtexSeparableKernel ka, kc;
if (splitR) {
if (f.adjface(e_right) >= 0) {
k.splitR(ka);
if (splitT) {
if (f.adjface(e_top) >= 0) {
ka.splitT(kc);
applyToCorner(kc, faceid, f, e_top);
}
else ka.mergeT(_vMode);
}
if (splitB) {
if (f.adjface(e_bottom) >= 0) {
ka.splitB(kc);
applyToCorner(kc, faceid, f, e_right);
}
else ka.mergeB(_vMode);
}
applyAcrossEdge(ka, faceid, f, e_right);
}
else k.mergeR(_uMode);
}
if (splitL) {
if (f.adjface(e_left) >= 0) {
k.splitL(ka);
if (splitT) {
if (f.adjface(e_top) >= 0) {
ka.splitT(kc);
applyToCorner(kc, faceid, f, e_left);
}
else ka.mergeT(_vMode);
}
if (splitB) {
if (f.adjface(e_bottom) >= 0) {
ka.splitB(kc);
applyToCorner(kc, faceid, f, e_bottom);
}
else ka.mergeB(_vMode);
}
applyAcrossEdge(ka, faceid, f, e_left);
}
else k.mergeL(_uMode);
}
if (splitT) {
if (f.adjface(e_top) >= 0) {
k.splitT(ka);
applyAcrossEdge(ka, faceid, f, e_top);
}
else k.mergeT(_vMode);
}
if (splitB) {
if (f.adjface(e_bottom) >= 0) {
k.splitB(ka);
applyAcrossEdge(ka, faceid, f, e_bottom);
}
else k.mergeB(_vMode);
}
}
#endif
// do local face
apply(k, faceid, f);
}