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//! Parses the brushes & brushsides lumps from a bsp file
/// The size of one brush record.
const BRUSH_SIZE: usize = 4 * 3;
/// The size of one brushsize record
const SIDE_SIZE: usize = 4 * 2;
use super::Q3BspFile;
use crate::coords::CoordSystem;
use crate::helpers::slice_to_i32;
use crate::traits::brushes::*;
use crate::types::{ParseError, Result};
/// Parse the brushes & brushsides lump from a bsp file.
pub fn from_data(
brushes_data: &[u8],
sides_data: &[u8],
n_textures: u32,
n_planes: u32,
) -> Result<Box<[Brush]>> {
if brushes_data.len() % BRUSH_SIZE != 0 || sides_data.len() % SIDE_SIZE != 0 {
return Err(ParseError::Invalid);
}
let length = brushes_data.len() / BRUSH_SIZE;
let mut brushes = Vec::with_capacity(length as usize);
for n in 0..length {
let offset = n * BRUSH_SIZE;
let brush = &brushes_data[offset..offset + BRUSH_SIZE];
let texture_idx = slice_to_i32(&brush[8..12]) as usize;
if texture_idx >= n_textures as usize {
return Err(ParseError::Invalid);
}
brushes.push(Brush {
sides: get_sides(
sides_data,
slice_to_i32(&brush[0..4]),
slice_to_i32(&brush[4..8]),
n_textures as usize,
n_planes as usize,
)?,
texture_idx,
});
}
Ok(brushes.into_boxed_slice())
}
/// Internal function to get the relevant brushsides for a brush from the data in the brush lump.
fn get_sides(
sides_data: &[u8],
start: i32,
length: i32,
n_textures: usize,
n_planes: usize,
) -> Result<Box<[BrushSide]>> {
let mut sides = Vec::with_capacity(length as usize);
if length > 0 {
for n in start..start + length {
let offset = n as usize * SIDE_SIZE;
let brush = &sides_data[offset..offset + SIDE_SIZE];
let plane_idx = slice_to_i32(&brush[0..4]) as usize;
if plane_idx / 2 >= n_planes {
return Err(ParseError::Invalid);
}
let is_opposing = plane_idx % 2 != 0;
let texture_idx = slice_to_i32(&brush[4..8]) as usize;
if texture_idx >= n_textures {
return Err(ParseError::Invalid);
}
sides.push(BrushSide {
plane_idx,
texture_idx,
is_opposing,
});
}
}
Ok(sides.into_boxed_slice())
}
impl<T: CoordSystem> HasBrushes<T> for Q3BspFile<T> {
type BrushesIter<'a> = std::slice::Iter<'a, Brush>;
fn brushes_iter(&self) -> Self::BrushesIter<'_> {
self.brushes.iter()
}
fn get_brush(&self, index: u32) -> &Brush {
&self.brushes[index as usize]
}
}
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