1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
use crate::header::*;
use byteorder::{BigEndian, ByteOrder, LittleEndian};
use core::{fmt, ops::Deref};
#[derive(Clone, Copy)]
pub struct Ktx<D> {
header: KtxHeader,
ktx_data: D,
texture_start: u32,
}
impl<D> AsRef<KtxHeader> for Ktx<D> {
#[inline]
fn as_ref(&self) -> &KtxHeader {
&self.header
}
}
impl<D> fmt::Debug for Ktx<D> {
fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
fmt.debug_struct("Ktx").field("header", &self.header).finish()
}
}
impl<D> Ktx<D>
where
D: Deref<Target = [u8]>,
{
#[inline]
pub fn new(ktx_data: D) -> Self {
let header = KtxHeader::new(&ktx_data);
let texture_start = 64 + header.bytes_of_key_value_data();
Self { header, ktx_data, texture_start }
}
#[inline]
pub fn texture_level(&self, level: u32) -> &[u8] {
self.textures().nth(level as _).expect("invalid level")
}
#[inline]
pub fn textures(&self) -> Textures<'_, D> {
Textures { parent: self, next_level: 0, level_end: self.texture_start as _ }
}
}
impl<D> From<D> for Ktx<D>
where
D: Deref<Target = [u8]>,
{
#[inline]
fn from(d: D) -> Self {
Ktx::new(d)
}
}
#[derive(Debug)]
pub struct Textures<'a, D> {
parent: &'a Ktx<D>,
next_level: u32,
level_end: usize,
}
impl<'a, D> Iterator for Textures<'a, D>
where
D: Deref<Target = [u8]>,
{
type Item = &'a [u8];
fn next(&mut self) -> Option<Self::Item> {
if self.next_level >= self.parent.mipmap_levels() {
None
} else {
self.next_level += 1;
let l_end = self.level_end;
let next_lvl_len = if self.parent.big_endian() {
BigEndian::read_u32(&self.parent.ktx_data[l_end..l_end + 4])
} else {
LittleEndian::read_u32(&self.parent.ktx_data[l_end..l_end + 4])
};
self.level_end = l_end + 4 + next_lvl_len as usize;
Some(&self.parent.ktx_data[l_end + 4..self.level_end])
}
}
}
impl<D> core::iter::FusedIterator for Textures<'_, D> where D: Deref<Target = [u8]> {}
#[macro_export]
macro_rules! include_ktx {
($path:tt) => {
$crate::Ktx::new(include_bytes!($path) as &[u8])
};
}