encase 0.4.1

Provides a mechanism to lay out data into GPU buffers ensuring WGSL's memory layout requirements are met
Documentation 
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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154

use crate::core::{
    BufferMut, BufferRef, CreateFrom, Metadata, ReadFrom, Reader, ShaderSize, ShaderType,
    WriteInto, Writer,
};
use core::num::{NonZeroI32, NonZeroU32, Wrapping};
use core::sync::atomic::{AtomicI32, AtomicU32};

macro_rules! impl_basic_traits {
    ($type:ty) => {
        impl ShaderType for $type {
            type ExtraMetadata = ();
            const METADATA: Metadata<Self::ExtraMetadata> = Metadata::from_alignment_and_size(4, 4);
        }

        impl ShaderSize for $type {}
    };
}

macro_rules! impl_traits {
    ($type:ty) => {
        impl_basic_traits!($type);

        impl WriteInto for $type {
            fn write_into<B: BufferMut>(&self, writer: &mut Writer<B>) {
                writer.write(&<$type>::to_le_bytes(*self));
            }
        }

        impl ReadFrom for $type {
            fn read_from<B: BufferRef>(&mut self, reader: &mut Reader<B>) {
                *self = <$type>::from_le_bytes(*reader.read());
            }
        }

        impl CreateFrom for $type {
            fn create_from<B: BufferRef>(reader: &mut Reader<B>) -> Self {
                <$type>::from_le_bytes(*reader.read())
            }
        }
    };
}

impl_traits!(f32);
impl_traits!(u32);
impl_traits!(i32);

macro_rules! impl_traits_for_non_zero_option {
    ($type:ty) => {
        impl_basic_traits!(Option<$type>);

        impl WriteInto for Option<$type> {
            fn write_into<B: BufferMut>(&self, writer: &mut Writer<B>) {
                let value = self.map(|num| num.get()).unwrap_or(0);
                WriteInto::write_into(&value, writer);
            }
        }

        impl ReadFrom for Option<$type> {
            fn read_from<B: BufferRef>(&mut self, reader: &mut Reader<B>) {
                *self = <$type>::new(CreateFrom::create_from(reader));
            }
        }

        impl CreateFrom for Option<$type> {
            fn create_from<B: BufferRef>(reader: &mut Reader<B>) -> Self {
                <$type>::new(CreateFrom::create_from(reader))
            }
        }
    };
}

impl_traits_for_non_zero_option!(NonZeroU32);
impl_traits_for_non_zero_option!(NonZeroI32);

macro_rules! impl_traits_for_wrapping {
    ($type:ty) => {
        impl_basic_traits!($type);

        impl WriteInto for $type {
            fn write_into<B: BufferMut>(&self, writer: &mut Writer<B>) {
                WriteInto::write_into(&self.0, writer);
            }
        }

        impl ReadFrom for $type {
            fn read_from<B: BufferRef>(&mut self, reader: &mut Reader<B>) {
                ReadFrom::read_from(&mut self.0, reader);
            }
        }

        impl CreateFrom for $type {
            fn create_from<B: BufferRef>(reader: &mut Reader<B>) -> Self {
                Wrapping(CreateFrom::create_from(reader))
            }
        }
    };
}

impl_traits_for_wrapping!(Wrapping<u32>);
impl_traits_for_wrapping!(Wrapping<i32>);

macro_rules! impl_traits_for_atomic {
    ($type:ty) => {
        impl_basic_traits!($type);

        impl WriteInto for $type {
            fn write_into<B: BufferMut>(&self, writer: &mut Writer<B>) {
                let value = self.load(std::sync::atomic::Ordering::Relaxed);
                WriteInto::write_into(&value, writer);
            }
        }

        impl ReadFrom for $type {
            fn read_from<B: BufferRef>(&mut self, reader: &mut Reader<B>) {
                ReadFrom::read_from(self.get_mut(), reader);
            }
        }

        impl CreateFrom for $type {
            fn create_from<B: BufferRef>(reader: &mut Reader<B>) -> Self {
                <$type>::new(CreateFrom::create_from(reader))
            }
        }
    };
}

impl_traits_for_atomic!(AtomicU32);
impl_traits_for_atomic!(AtomicI32);

macro_rules! impl_marker_trait_for_f32 {
    ($trait:path) => {
        impl $trait for ::core::primitive::f32 {}
    };
}

macro_rules! impl_marker_trait_for_u32 {
    ($trait:path) => {
        impl $trait for ::core::primitive::u32 {}
        impl $trait for ::core::num::NonZeroU32 {}
        impl $trait for ::core::option::Option<::core::num::NonZeroU32> {}
        impl $trait for ::core::num::Wrapping<::core::primitive::u32> {}
        impl $trait for ::core::sync::atomic::AtomicU32 {}
    };
}

macro_rules! impl_marker_trait_for_i32 {
    ($trait:path) => {
        impl $trait for ::core::primitive::i32 {}
        impl $trait for ::core::num::NonZeroI32 {}
        impl $trait for ::core::option::Option<::core::num::NonZeroI32> {}
        impl $trait for ::core::num::Wrapping<::core::primitive::i32> {}
        impl $trait for ::core::sync::atomic::AtomicI32 {}
    };
}