naga/valid/
compose.rs

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
use crate::proc::TypeResolution;

use crate::arena::Handle;

#[derive(Clone, Debug, thiserror::Error)]
#[cfg_attr(test, derive(PartialEq))]
pub enum ComposeError {
    #[error("Composing of type {0:?} can't be done")]
    Type(Handle<crate::Type>),
    #[error("Composing expects {expected} components but {given} were given")]
    ComponentCount { given: u32, expected: u32 },
    #[error("Composing {index}'s component type is not expected")]
    ComponentType { index: u32 },
}

pub fn validate_compose(
    self_ty_handle: Handle<crate::Type>,
    gctx: crate::proc::GlobalCtx,
    component_resolutions: impl ExactSizeIterator<Item = TypeResolution>,
) -> Result<(), ComposeError> {
    use crate::TypeInner as Ti;

    match gctx.types[self_ty_handle].inner {
        // vectors are composed from scalars or other vectors
        Ti::Vector { size, scalar } => {
            let mut total = 0;
            for (index, comp_res) in component_resolutions.enumerate() {
                total += match *comp_res.inner_with(gctx.types) {
                    Ti::Scalar(comp_scalar) if comp_scalar == scalar => 1,
                    Ti::Vector {
                        size: comp_size,
                        scalar: comp_scalar,
                    } if comp_scalar == scalar => comp_size as u32,
                    ref other => {
                        log::error!(
                            "Vector component[{}] type {:?}, building {:?}",
                            index,
                            other,
                            scalar
                        );
                        return Err(ComposeError::ComponentType {
                            index: index as u32,
                        });
                    }
                };
            }
            if size as u32 != total {
                return Err(ComposeError::ComponentCount {
                    expected: size as u32,
                    given: total,
                });
            }
        }
        // matrix are composed from column vectors
        Ti::Matrix {
            columns,
            rows,
            scalar,
        } => {
            let inner = Ti::Vector { size: rows, scalar };
            if columns as usize != component_resolutions.len() {
                return Err(ComposeError::ComponentCount {
                    expected: columns as u32,
                    given: component_resolutions.len() as u32,
                });
            }
            for (index, comp_res) in component_resolutions.enumerate() {
                if comp_res.inner_with(gctx.types) != &inner {
                    log::error!("Matrix component[{}] type {:?}", index, comp_res);
                    return Err(ComposeError::ComponentType {
                        index: index as u32,
                    });
                }
            }
        }
        Ti::Array {
            base,
            size: crate::ArraySize::Constant(count),
            stride: _,
        } => {
            if count.get() as usize != component_resolutions.len() {
                return Err(ComposeError::ComponentCount {
                    expected: count.get(),
                    given: component_resolutions.len() as u32,
                });
            }
            for (index, comp_res) in component_resolutions.enumerate() {
                let base_inner = &gctx.types[base].inner;
                let comp_res_inner = comp_res.inner_with(gctx.types);
                // We don't support arrays of pointers, but it seems best not to
                // embed that assumption here, so use `TypeInner::equivalent`.
                if !base_inner.equivalent(comp_res_inner, gctx.types) {
                    log::error!("Array component[{}] type {:?}", index, comp_res);
                    return Err(ComposeError::ComponentType {
                        index: index as u32,
                    });
                }
            }
        }
        Ti::Struct { ref members, .. } => {
            if members.len() != component_resolutions.len() {
                return Err(ComposeError::ComponentCount {
                    given: component_resolutions.len() as u32,
                    expected: members.len() as u32,
                });
            }
            for (index, (member, comp_res)) in members.iter().zip(component_resolutions).enumerate()
            {
                let member_inner = &gctx.types[member.ty].inner;
                let comp_res_inner = comp_res.inner_with(gctx.types);
                // We don't support pointers in structs, but it seems best not to embed
                // that assumption here, so use `TypeInner::equivalent`.
                if !comp_res_inner.equivalent(member_inner, gctx.types) {
                    log::error!("Struct component[{}] type {:?}", index, comp_res);
                    return Err(ComposeError::ComponentType {
                        index: index as u32,
                    });
                }
            }
        }
        ref other => {
            log::error!("Composing of {:?}", other);
            return Err(ComposeError::Type(self_ty_handle));
        }
    }

    Ok(())
}