arcdps_imgui\render/
renderer.rs

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1use std::collections::HashMap;
2
3/// An opaque texture identifier
4#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
5#[repr(transparent)]
6pub struct TextureId(usize);
7
8impl TextureId {
9    /// Creates a new texture id with the given identifier.
10    #[inline]
11    pub const fn new(id: usize) -> Self {
12        Self(id)
13    }
14
15    /// Returns the id of the TextureId.
16    #[inline]
17    pub const fn id(self) -> usize {
18        self.0
19    }
20}
21
22impl From<usize> for TextureId {
23    #[inline]
24    fn from(id: usize) -> Self {
25        TextureId(id)
26    }
27}
28
29impl<T> From<*const T> for TextureId {
30    #[inline]
31    fn from(ptr: *const T) -> Self {
32        TextureId(ptr as usize)
33    }
34}
35
36impl<T> From<*mut T> for TextureId {
37    #[inline]
38    fn from(ptr: *mut T) -> Self {
39        TextureId(ptr as usize)
40    }
41}
42
43#[test]
44fn test_texture_id_memory_layout() {
45    use std::mem;
46    assert_eq!(
47        mem::size_of::<TextureId>(),
48        mem::size_of::<sys::ImTextureID>()
49    );
50    assert_eq!(
51        mem::align_of::<TextureId>(),
52        mem::align_of::<sys::ImTextureID>()
53    );
54}
55
56/// Generic texture mapping for use by renderers.
57#[derive(Debug, Default)]
58pub struct Textures<T> {
59    textures: HashMap<usize, T>,
60    next: usize,
61}
62
63impl<T> Textures<T> {
64    // TODO: hasher like rustc_hash::FxHashMap or something would let this be
65    // `const fn`
66    pub fn new() -> Self {
67        Textures {
68            textures: HashMap::new(),
69            next: 0,
70        }
71    }
72
73    pub fn insert(&mut self, texture: T) -> TextureId {
74        let id = self.next;
75        self.textures.insert(id, texture);
76        self.next += 1;
77        TextureId::from(id)
78    }
79
80    pub fn replace(&mut self, id: TextureId, texture: T) -> Option<T> {
81        self.textures.insert(id.0, texture)
82    }
83
84    pub fn remove(&mut self, id: TextureId) -> Option<T> {
85        self.textures.remove(&id.0)
86    }
87
88    pub fn get(&self, id: TextureId) -> Option<&T> {
89        self.textures.get(&id.0)
90    }
91
92    pub fn get_mut(&mut self, id: TextureId) -> Option<&mut T> {
93        self.textures.get_mut(&id.0)
94    }
95}
arcdps_imgui\render/renderer.rs

arcdps_imgui\render/
renderer.rs
