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/*
* Copyright (C) Oscar Shrimpton 2020
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//! Parses visdata from Q3 BSPs.
use bitvec::prelude::*;
use std::vec::IntoIter;
use super::file::Q3BspFile;
use crate::coords::CoordSystem;
use crate::helpers::slice_to_i32;
use crate::traits::visdata::*;
use crate::types::{ParseError, Result};
/// Stores cluster-to-cluster visibility information.
pub fn from_data(data: &[u8]) -> Result<Box<[BitBox<Local, u8>]>> {
if data.len() < 8 {
return Err(ParseError::Invalid);
}
let n_vecs = slice_to_i32(&data[0..4]) as usize;
let size_vecs = slice_to_i32(&data[4..8]) as usize;
if data.len() - 8 != (n_vecs * size_vecs) {
return Err(ParseError::Invalid);
}
let mut vecs = Vec::with_capacity(n_vecs);
for n in 0..n_vecs {
let offset = 8 + (n * size_vecs);
let slice = &data[offset..offset + size_vecs];
vecs.push(BitBox::from_slice(slice));
}
Ok(vecs.into_boxed_slice())
}
impl<T: CoordSystem> HasVisData for Q3BspFile<T> {
type VisibleIterator = IntoIter<ClusterId>;
fn all_visible_from(&self, from: ClusterId) -> Self::VisibleIterator {
let mut visible = vec![];
for (idx, val) in self.visdata[from as usize].iter().enumerate() {
if *val {
visible.push(idx as u32);
}
}
visible.into_iter()
}
fn cluster_visible_from(&self, from: ClusterId, dest: ClusterId) -> bool {
self.visdata[from as usize][dest as usize]
}
}
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