Have `compact::compact` preserve entries in the `Module::types` arena
if they have names.
Future abstract type support will require the WGSL front end to
compact the module before validation. Without this change, that will
drop `alias` declarations, making it harder to test type validation.
Previously, implicit padding members of `struct`s were suppressed from
structure definitions in Metal output if they had a binding specified
for them (i.e., `@location(0)`). This padding is, however, is necessary
for correct access of member fields passed into shaders by uniform and
storage buffers. Unconditionally emit padding members for `struct`s.
Resolves
[`gfx-rs/wgpu`#4701](https://github.com/gfx-rs/wgpu/pull/4701).
Test Naga's WGSL front end's handling of `h` and `f` suffixes on
hexadecimal float literals. WGSL permits these suffixes only if an
exponent is present, because otherwise `f` suffixes can be confused
with a hexadecimal digit.
Following Rust convention, let `naga::front::wgsl::ParseError`'s
methods `emit_to_stderr_with_path` and `emit_to_string_with_path`
accept any `AsRef<Path>` argument as the path.
Pass input paths in snapshot tests, so that failures processing
shaders name the input file being processed.
Change the WGSL code in the `function_returns_void` test in
`tests/wgsl-errors.rs` so that the construction expression types
correctly. Subsequent iterations of the WGSL front end will be doing
some type checking earlier, to support WGSL's automatic conversions,
and without this fix, this test will stop checking what it is intended
to check.
Let `naga::TypeInner::Matrix` hold a full `Scalar`, with a kind and
byte width, not merely a byte width, to make it possible to represent
matrices of AbstractFloats for WGSL.
Add an `I64` variant to `crate::Literal`, making `crate::Expression`
suitable for representing `AbstractFloat` and `AbstractInt` values in
the WGSL front end.
Make validation reject uses of `Literal::I64` in constant and function
expression arenas unconditionally. Add tests for this.
Let the frontends and backends for languages that have 64-bit integers
read/write them.
When asked to evaluate an `Expression::As` cast applied to a `Splat`
expression, change `ConstantEvaluator::cast` to preserve the `Splat`,
rather than expanding it out to a `Compose` expression.
When formatting `TypeInner::Pointer` and `TypeInner::Array` as WGSL
source code, bother to actually generate text for the target/element
type. This avoids producing ridiculous messages like:
> the type of `foo` is expected to be `array<unknown, 2>`, but got `array<unknown, 2>`
When generating WGSL for an `Expression::Compose` constructing a
matrix, consult `TypeInner::Matrix::width` when writing the
type name in the construction expression, rather than just always
writing `matNxM<f32>`.
Fixes#4681.
The second argument of the GLSL `ldexp` builtin is always a 32-bit
integer or a vector of such, never a 64-bit integer. In
`inject_common_builtin`, that argument's type should not be influenced
by `float_width`.
Fixes#4680.
The first argument of the `dot`, `reflect`, `distance`, and `ldexp`
GLSL builtin functions may be either a float or a double, and thus the
argument type registered by `inject_common_builtin` must depend on the
`float_width` argument; it cannot simply be `Scalar::F32`.
Introduced by #4673.
Replace `ExpressionContext`'s methods `format_typeinner`,
`format_type`, and `format_type_resolution` with more `to_wgsl`
methods in the `naga::front::wgsl::to_wgsl` module.
Clean up some things that should have been taken care of in the
original PR:
- Use `Scalar::float` helper.
- Use `Scalar` associated constants in match patterns.
- Use `Scalar`'s `PartialEq` implementation.
- Clean up identifier paths.
Identify reachable function expressions, constant expressions, and
types using a single pass over each arena, taking advantage of the
fact that expressions and types may only refer to other entries that
precede them within their arena. Only walking the statement tree still
requires a worklist/recursion.
In addition to presumably being faster, this change slightly reduces
the number of non-comment lines of code in `src/compact`.
Introduce a new struct type, `Scalar`, combining a `ScalarKind` and a
`Bytes` width, and use this whenever such pairs of values are passed
around.
In particular, use `Scalar` in `TypeInner` variants `Scalar`, `Vector`,
`Atomic`, and `ValuePointer`.
Introduce associated `Scalar` constants `I32`, `U32`, `F32`, `BOOL`
and `F64`, for common cases.
Introduce a helper function `Scalar::float` for constructing `Float`
scalars of a given width, for dealing with `TypeInner::Matrix`, which
only supplies the scalar width of its elements, not a kind.
Introduce helper functions on `Literal` and `TypeInner`, to produce
the `Scalar` describing elements' values.
Use `Scalar` in `wgpu_core::validation::NumericType` as well.
Introduce a new struct `Scalar`, holding a scalar kind and width, and
use it as appropriate in the WGSL front end. This consolidates
many (kind, width) pairs, and lets us name the two components.
Ideally, `Scalar` would be used throughout Naga, but this would be a large
change, touching hundreds of use sites. This patch begins by
introducing `Scalar` to the WGSL front end only.
This appears to match other backends, and fixes
fix the case where expressions which were named in earlier
functions are used in local variable declarations
Replace the `TypedExpression` struct, used to distinguish between WGSL
pointers and references since Naga has only `Pointer`, with an enum,
`Typed`, with variants for references and plain types. This cleans up
a bunch of code, since the struct's `is_reference` field basically
served as a detached enum discriminant. This also prepares the code
for adding abstract types.
When an error snapshot test fails and we generate a diff comparing the
expected output with the actual output, treat the expected output as
the diff "from", and the actual output as the diff "to" - not the
reverse.
