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
use std::collections::HashMap;
#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
#[repr(transparent)]
pub struct TextureId(usize);
impl TextureId {
pub fn id(self) -> usize {
self.0
}
}
impl From<usize> for TextureId {
fn from(id: usize) -> Self {
TextureId(id)
}
}
impl<T> From<*const T> for TextureId {
fn from(ptr: *const T) -> Self {
TextureId(ptr as usize)
}
}
impl<T> From<*mut T> for TextureId {
fn from(ptr: *mut T) -> Self {
TextureId(ptr as usize)
}
}
#[test]
fn test_texture_id_memory_layout() {
use std::mem;
assert_eq!(
mem::size_of::<TextureId>(),
mem::size_of::<sys::ImTextureID>()
);
assert_eq!(
mem::align_of::<TextureId>(),
mem::align_of::<sys::ImTextureID>()
);
}
#[derive(Debug, Default)]
pub struct Textures<T> {
textures: HashMap<usize, T>,
next: usize,
}
impl<T> Textures<T> {
pub fn new() -> Self {
Textures {
textures: HashMap::new(),
next: 0,
}
}
pub fn insert(&mut self, texture: T) -> TextureId {
let id = self.next;
self.textures.insert(id, texture);
self.next += 1;
TextureId::from(id)
}
pub fn replace(&mut self, id: TextureId, texture: T) -> Option<T> {
self.textures.insert(id.0, texture)
}
pub fn remove(&mut self, id: TextureId) -> Option<T> {
self.textures.remove(&id.0)
}
pub fn get(&self, id: TextureId) -> Option<&T> {
self.textures.get(&id.0)
}
pub fn get_mut(&mut self, id: TextureId) -> Option<&mut T> {
self.textures.get_mut(&id.0)
}
}