/**
* Move a voxel stack to this world. May destroy the original stack in the process.
* @param vs Source stack.
*/
void VoxelStack::MoveStack(VoxelStack *vs)
{
/* Clean up the stack a bit before copying it, and get lowest and highest non-empty voxel. */
int vs_first = 0;
int vs_last = 0;
for (int i = 0; i < (int)vs->height; i++) {
Voxel *v = &vs->voxels[i];
assert(!v->HasVoxelObjects()); // There should be no voxel objects in the stack being moved.
if (!v->IsEmpty()) {
vs_last = i;
} else {
if (vs_first == i) vs_first++;
}
}
/* There should be at least one surface voxel. */
assert(vs_first <= vs_last);
/* Examine current stack with respect to persons. */
int old_first = 0;
int old_last = 0;
for (int i = 0; i < (int)this->height; i++) {
const Voxel *v = &this->voxels[i];
if (v->HasVoxelObjects()) {
old_last = i;
} else {
if (old_first == i) old_first++;
}
}
int new_base = std::min(vs->base + vs_first, this->base + old_first);
int new_height = std::max(vs->base + vs_last, this->base + old_last) - new_base + 1;
assert(new_base >= 0);
/* Make a new stack. Copy new surface, then copy the persons. */
Voxel *new_voxels = MakeNewVoxels(new_height);
CopyStackData(new_voxels + (vs->base + vs_first) - new_base, vs->voxels + vs_first, vs_last - vs_first + 1, false);
int i = (this->base + old_first) - new_base;
while (old_first <= old_last) {
CopyVoxelObjectList(&new_voxels[i], &this->voxels[old_first]);
i++;
old_first++;
}
this->base = new_base;
this->height = new_height;
delete[] this->voxels;
this->voxels = new_voxels;
}
