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feat(wgsl-in): create skeleton for
enable directives
Co-Authored-By: FL33TW00D <chris@fleetwood.dev>
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112 changes: 112 additions & 0 deletions
112
naga/src/front/wgsl/parse/directive/enable_extension.rs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| //! `enable …;` extensions in WGSL. | ||
| //! | ||
| //! The focal point of this module is the [`EnableExtension`] API. | ||
| use crate::{front::wgsl::error::Error, Span}; | ||
|
|
||
| /// Tracks the status of every enable extension known to Naga. | ||
| #[derive(Clone, Debug, Eq, PartialEq)] | ||
| pub struct EnableExtensions {} | ||
|
|
||
| impl EnableExtensions { | ||
| pub(crate) const fn empty() -> Self { | ||
| Self {} | ||
| } | ||
|
|
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| /// Add an enable extension to the set requested by a module. | ||
| #[allow(unreachable_code)] | ||
| pub(crate) fn add(&mut self, ext: ImplementedEnableExtension) { | ||
| let _field: &mut bool = match ext {}; | ||
| *_field = true; | ||
| } | ||
|
|
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| /// Query whether an enable extension tracked here has been requested. | ||
| #[allow(unused)] | ||
| pub(crate) const fn contains(&self, ext: ImplementedEnableExtension) -> bool { | ||
| match ext {} | ||
| } | ||
| } | ||
|
|
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| impl Default for EnableExtensions { | ||
| fn default() -> Self { | ||
| Self::empty() | ||
| } | ||
| } | ||
|
|
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| /// A shader language extension not guaranteed to be present in all environments. | ||
| /// | ||
| /// WGSL spec.: <https://www.w3.org/TR/WGSL/#enable-extensions-sec> | ||
| #[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)] | ||
| pub enum EnableExtension { | ||
| #[allow(unused)] | ||
| Implemented(ImplementedEnableExtension), | ||
| Unimplemented(UnimplementedEnableExtension), | ||
| } | ||
|
|
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| impl EnableExtension { | ||
| const F16: &'static str = "f16"; | ||
| const CLIP_DISTANCES: &'static str = "clip_distances"; | ||
| const DUAL_SOURCE_BLENDING: &'static str = "dual_source_blending"; | ||
|
|
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| /// Convert from a sentinel word in WGSL into its associated [`EnableExtension`], if possible. | ||
| pub(crate) fn from_ident(word: &str, span: Span) -> Result<Self, Error<'_>> { | ||
| Ok(match word { | ||
| Self::F16 => Self::Unimplemented(UnimplementedEnableExtension::F16), | ||
| Self::CLIP_DISTANCES => { | ||
| Self::Unimplemented(UnimplementedEnableExtension::ClipDistances) | ||
| } | ||
| Self::DUAL_SOURCE_BLENDING => { | ||
| Self::Unimplemented(UnimplementedEnableExtension::DualSourceBlending) | ||
| } | ||
| _ => return Err(Error::UnknownEnableExtension(span, word)), | ||
| }) | ||
| } | ||
|
|
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| /// Maps this [`EnableExtension`] into the sentinel word associated with it in WGSL. | ||
| pub fn to_ident(self) -> &'static str { | ||
| match self { | ||
| Self::Implemented(kind) => match kind {}, | ||
| Self::Unimplemented(kind) => match kind { | ||
| UnimplementedEnableExtension::F16 => Self::F16, | ||
| UnimplementedEnableExtension::ClipDistances => todo!(), | ||
| UnimplementedEnableExtension::DualSourceBlending => todo!(), | ||
| }, | ||
| } | ||
| } | ||
| } | ||
|
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| /// A variant of [`EnableExtension::Implemented`]. | ||
| #[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)] | ||
| pub enum ImplementedEnableExtension {} | ||
|
|
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| /// A variant of [`EnableExtension::Unimplemented`]. | ||
| #[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)] | ||
| pub enum UnimplementedEnableExtension { | ||
| /// Enables `f16`/`half` primitive support in all shader languages. | ||
| /// | ||
| /// In the WGSL standard, this corresponds to [`enable f16;`]. | ||
| /// | ||
| /// [`enable f16;`]: https://www.w3.org/TR/WGSL/#extension-f16 | ||
| F16, | ||
| /// Enables the `clip_distances` variable in WGSL. | ||
| /// | ||
| /// In the WGSL standard, this corresponds to [`enable clip_distances;`]. | ||
| /// | ||
| /// [`enable clip_distances;`]: https://www.w3.org/TR/WGSL/#extension-f16 | ||
| ClipDistances, | ||
| /// Enables the `blend_src` attribute in WGSL. | ||
| /// | ||
| /// In the WGSL standard, this corresponds to [`enable dual_source_blending;`]. | ||
| /// | ||
| /// [`enable dual_source_blending;`]: https://www.w3.org/TR/WGSL/#extension-f16 | ||
| DualSourceBlending, | ||
| } | ||
|
|
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| impl UnimplementedEnableExtension { | ||
| pub(crate) const fn tracking_issue_num(self) -> u16 { | ||
| match self { | ||
| Self::F16 => 4384, | ||
| Self::ClipDistances => 6236, | ||
| Self::DualSourceBlending => 6402, | ||
| } | ||
| } | ||
| } |
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