template <> const Item::Bound payloadGetBound(const Overlay::Pointer& overlay) {
if (overlay->is3D()) {
return static_cast<Base3DOverlay*>(overlay.get())->getBounds();
} else {
QRect bounds = static_cast<Overlay2D*>(overlay.get())->getBounds();
return AABox(glm::vec3(bounds.x(), bounds.y(), 0.0f), glm::vec3(bounds.width(), bounds.height(), 0.1f));
}
}
template <> const ItemKey payloadGetKey(const Overlay::Pointer& overlay) {
if (overlay->is3D() && !static_cast<Base3DOverlay*>(overlay.get())->getDrawOnHUD()) {
if (static_cast<Base3DOverlay*>(overlay.get())->getDrawInFront()) {
return ItemKey::Builder().withTypeShape().withLayered().build();
} else {
return ItemKey::Builder::opaqueShape();
}
} else {
return ItemKey::Builder().withTypeShape().withViewSpace().build();
}
}
template <> int payloadGetLayer(const Overlay::Pointer& overlay) {
// MAgic number while we are defining the layering mechanism:
const int LAYER_2D = 2;
const int LAYER_3D_FRONT = 1;
const int LAYER_3D = 0;
if (overlay->is3D()) {
return (static_cast<Base3DOverlay*>(overlay.get())->getDrawInFront() ? LAYER_3D_FRONT : LAYER_3D);
} else {
return LAYER_2D;
}
}