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// Copyright (C) 2019 Oscar Shrimpton
//
// This file is part of rust_bsp.
//
// rust_bsp 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.
//
// rust_bsp 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 rust_bsp. If not, see <http://www.gnu.org/licenses/>.
//! Parses the BSP tree into a usable format
use crate::coords::CoordSystem;
use crate::helpers::{slice_to_u32, slice_to_i32, slice_to_vec3i};
use crate::types::{ParseError, Result};
use crate::traits::tree::*;
use super::Q3BSPFile;
const NODE_SIZE: usize = 4 + (4 * 2) + (4 * 3) + (4 * 3);
const LEAF_SIZE: usize = 4 * 6 + (4 * 3 * 2);
pub fn from_data(
nodes: &[u8],
leaves: &[u8],
leaf_faces: &[u8],
leaf_brushes: &[u8],
n_faces: u32,
n_brushes: u32,
) -> Result<BSPNode> {
if nodes.len() % NODE_SIZE != 0 || leaves.len() % LEAF_SIZE != 0 {
return Err(ParseError::Invalid);
}
Ok(compile_node(
0,
nodes,
leaves,
leaf_faces,
leaf_brushes,
n_faces,
n_brushes,
)?,
)
}
/// Internal function. Visits given node and all its children. Used to recursively build tree.
fn compile_node(
i: i32,
nodes: &[u8],
leaves: &[u8],
leaf_faces: &[u8],
leaf_brushes: &[u8],
n_faces: u32,
n_brushes: u32,
) -> Result<BSPNode> {
if i < 0 {
// Leaf.
let i = i.abs() - 1;
let raw = &leaves[i as usize * LEAF_SIZE..(i as usize * LEAF_SIZE) + LEAF_SIZE];
let faces_idx = {
let start = slice_to_u32(&raw[32..36]) as usize;
let n = slice_to_u32(&raw[36..40]) as usize;
let mut faces = Vec::with_capacity(n);
if n > 0 {
if start + n > leaf_faces.len() / 4 {
return Err(ParseError::Invalid);
}
for i in start..start + n {
let face_idx = slice_to_u32(&leaf_faces[i * 4..(i + 1) * 4]);
if face_idx >= n_faces {
return Err(ParseError::Invalid);
}
faces.push(face_idx);
}
}
faces.into_boxed_slice()
};
let brushes_idx = {
let start = slice_to_u32(&raw[40..44]) as usize;
let n = slice_to_u32(&raw[44..48]) as usize;
let mut brushes = Vec::with_capacity(n);
if n > 0 {
if start + n > leaf_brushes.len() / 4 {
return Err(ParseError::Invalid);
}
for i in start..start + n {
let brush_idx = slice_to_u32(&leaf_brushes[i * 4..(i + 1) * 4]);
if brush_idx >= n_brushes {
return Err(ParseError::Invalid);
}
brushes.push(brush_idx);
}
}
brushes.into_boxed_slice()
};
let leaf = BSPLeaf {
cluster_id: slice_to_u32(&raw[0..4]),
area: slice_to_i32(&raw[4..8]),
// 8..20 = min
// 20..32 = max
faces_idx,
brushes_idx,
};
Ok(BSPNode {
plane_idx: 0,
min: slice_to_vec3i(&raw[8..20]),
max: slice_to_vec3i(&raw[20..32]),
value: BSPNodeValue::Leaf(leaf),
})
} else {
// Node.
let raw = &nodes[i as usize * NODE_SIZE..(i as usize * NODE_SIZE) + NODE_SIZE];
let plane_idx = slice_to_u32(&raw[0..4]);
let child_one = compile_node(
slice_to_i32(&raw[4..8]),
nodes,
leaves,
leaf_faces,
leaf_brushes,
n_faces,
n_brushes,
)?;
let child_two = compile_node(
slice_to_i32(&raw[8..12]),
nodes,
leaves,
leaf_faces,
leaf_brushes,
n_faces,
n_brushes,
)?;
let min = slice_to_vec3i(&raw[12..24]);
let max = slice_to_vec3i(&raw[24..36]);
Ok(BSPNode {
plane_idx,
value: BSPNodeValue::Children(Box::new(child_one), Box::new(child_two)),
min,
max,
})
}
}
impl<T: CoordSystem> HasBSPTree<T> for Q3BSPFile<T> {
fn get_bsp_root<'a>(&'a self) -> &'a BSPNode {
&self.tree_root
}
}
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