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
|
use crate::{Handle, UniqueArena};
use spirv::Word;
pub(super) fn bytes_to_words(bytes: &[u8]) -> Vec<Word> {
bytes
.chunks(4)
.map(|chars| chars.iter().rev().fold(0u32, |u, c| (u << 8) | *c as u32))
.collect()
}
pub(super) fn string_to_words(input: &str) -> Vec<Word> {
let bytes = input.as_bytes();
let mut words = bytes_to_words(bytes);
if bytes.len() % 4 == 0 {
// nul-termination
words.push(0x0u32);
}
words
}
pub(super) const fn map_storage_class(space: crate::AddressSpace) -> spirv::StorageClass {
match space {
crate::AddressSpace::Handle => spirv::StorageClass::UniformConstant,
crate::AddressSpace::Function => spirv::StorageClass::Function,
crate::AddressSpace::Private => spirv::StorageClass::Private,
crate::AddressSpace::Storage { .. } => spirv::StorageClass::StorageBuffer,
crate::AddressSpace::Uniform => spirv::StorageClass::Uniform,
crate::AddressSpace::WorkGroup => spirv::StorageClass::Workgroup,
crate::AddressSpace::PushConstant => spirv::StorageClass::PushConstant,
}
}
pub(super) fn contains_builtin(
binding: Option<&crate::Binding>,
ty: Handle<crate::Type>,
arena: &UniqueArena<crate::Type>,
built_in: crate::BuiltIn,
) -> bool {
if let Some(&crate::Binding::BuiltIn(bi)) = binding {
bi == built_in
} else if let crate::TypeInner::Struct { ref members, .. } = arena[ty].inner {
members
.iter()
.any(|member| contains_builtin(member.binding.as_ref(), member.ty, arena, built_in))
} else {
false // unreachable
}
}
impl crate::AddressSpace {
pub(super) const fn to_spirv_semantics_and_scope(
self,
) -> (spirv::MemorySemantics, spirv::Scope) {
match self {
Self::Storage { .. } => (spirv::MemorySemantics::UNIFORM_MEMORY, spirv::Scope::Device),
Self::WorkGroup => (
spirv::MemorySemantics::WORKGROUP_MEMORY,
spirv::Scope::Workgroup,
),
_ => (spirv::MemorySemantics::empty(), spirv::Scope::Invocation),
}
}
}
/// Return true if the global requires a type decorated with `Block`.
///
/// Vulkan spec v1.3 §15.6.2, "Descriptor Set Interface", says:
///
/// > Variables identified with the `Uniform` storage class are used to
/// > access transparent buffer backed resources. Such variables must
/// > be:
/// >
/// > - typed as `OpTypeStruct`, or an array of this type,
/// >
/// > - identified with a `Block` or `BufferBlock` decoration, and
/// >
/// > - laid out explicitly using the `Offset`, `ArrayStride`, and
/// > `MatrixStride` decorations as specified in §15.6.4, "Offset
/// > and Stride Assignment."
// See `back::spv::GlobalVariable::access_id` for details.
pub fn global_needs_wrapper(ir_module: &crate::Module, var: &crate::GlobalVariable) -> bool {
match var.space {
crate::AddressSpace::Uniform
| crate::AddressSpace::Storage { .. }
| crate::AddressSpace::PushConstant => {}
_ => return false,
};
match ir_module.types[var.ty].inner {
crate::TypeInner::Struct {
ref members,
span: _,
} => match members.last() {
Some(member) => match ir_module.types[member.ty].inner {
// Structs with dynamically sized arrays can't be copied and can't be wrapped.
crate::TypeInner::Array {
size: crate::ArraySize::Dynamic,
..
} => false,
_ => true,
},
None => false,
},
// if it's not a structure, let's wrap it to be able to put "Block"
_ => true,
}
}
|
