bool Clipping::SutherlandHodgmanPolygonClip(Object* p){
auto &input = p->getNCoords();
Coordinates tmp;
clipLeft(input, tmp);
clipRight(tmp, input);
clipBottom(input, tmp);
clipTop(tmp, input);
return (input.size() != 0);
}
bool Clipping::SutherlandHodgmanPolygonClip(Object* p){
auto input = p->getNCoords();
Coordinates tmp;
Coordinates output;
clipLeft(input, tmp);
clipRight(tmp, output);
clipTop(output, tmp);
clipBottom(tmp, output);
if(output.size() == 0)
return false;
p->setNCoord(output);
return true;
}
void Triangle2HeightField::clipTriangleAgainstHeightField(const osg::Vec2d& v1, const osg::Vec2d& v2, const osg::Vec2d& v3,
std::vector<osg::Vec2d>& result)
{
std::vector<osg::Vec2d>& in = result;
in.clear();
in.push_back(v1);
in.push_back(v2);
in.push_back(v3);
std::vector<osg::Vec2d> out;
clipRight(in, out, _heightField->getNumColumns()-1);
in.clear();
clipLeft(out, in, 0);
out.clear();
clipTop(in, out, _heightField->getNumRows()-1);
in.clear();
clipBottom(out, in, 0);
}
bool Clipper::clip(Polygon &polygon, int clipFlagsOr, const DrawCall &draw)
{
if(clipFlagsOr & CLIP_FRUSTUM)
{
if(clipFlagsOr & CLIP_NEAR) clipNear(polygon);
if(polygon.n >= 3) {
if(clipFlagsOr & CLIP_FAR) clipFar(polygon);
if(polygon.n >= 3) {
if(clipFlagsOr & CLIP_LEFT) clipLeft(polygon);
if(polygon.n >= 3) {
if(clipFlagsOr & CLIP_RIGHT) clipRight(polygon);
if(polygon.n >= 3) {
if(clipFlagsOr & CLIP_TOP) clipTop(polygon);
if(polygon.n >= 3) {
if(clipFlagsOr & CLIP_BOTTOM) clipBottom(polygon);
}}}}}
}
return polygon.n >= 3;
}
