Revision control
Copy as Markdown
Other Tools
//! `requires …;` extensions in WGSL.
//!
//! The focal point of this module is the [`LanguageExtension`] API.
/// A language extension not guaranteed to be present in all environments.
///
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub(crate) enum LanguageExtension {
#[allow(unused)]
Implemented(ImplementedLanguageExtension),
Unimplemented(UnimplementedLanguageExtension),
}
impl LanguageExtension {
const READONLY_AND_READWRITE_STORAGE_TEXTURES: &'static str =
"readonly_and_readwrite_storage_textures";
const PACKED4X8_INTEGER_DOT_PRODUCT: &'static str = "packed_4x8_integer_dot_product";
const UNRESTRICTED_POINTER_PARAMETERS: &'static str = "unrestricted_pointer_parameters";
const POINTER_COMPOSITE_ACCESS: &'static str = "pointer_composite_access";
/// Convert from a sentinel word in WGSL into its associated [`LanguageExtension`], if possible.
pub fn from_ident(s: &str) -> Option<Self> {
Some(match s {
Self::READONLY_AND_READWRITE_STORAGE_TEXTURES => Self::Unimplemented(
UnimplementedLanguageExtension::ReadOnlyAndReadWriteStorageTextures,
),
Self::PACKED4X8_INTEGER_DOT_PRODUCT => {
Self::Unimplemented(UnimplementedLanguageExtension::Packed4x8IntegerDotProduct)
}
Self::UNRESTRICTED_POINTER_PARAMETERS => {
Self::Unimplemented(UnimplementedLanguageExtension::UnrestrictedPointerParameters)
}
Self::POINTER_COMPOSITE_ACCESS => {
Self::Unimplemented(UnimplementedLanguageExtension::PointerCompositeAccess)
}
_ => return None,
})
}
/// Maps this [`LanguageExtension`] into the sentinel word associated with it in WGSL.
pub const fn to_ident(self) -> &'static str {
match self {
Self::Implemented(kind) => match kind {},
Self::Unimplemented(kind) => match kind {
UnimplementedLanguageExtension::ReadOnlyAndReadWriteStorageTextures => {
Self::READONLY_AND_READWRITE_STORAGE_TEXTURES
}
UnimplementedLanguageExtension::Packed4x8IntegerDotProduct => {
Self::PACKED4X8_INTEGER_DOT_PRODUCT
}
UnimplementedLanguageExtension::UnrestrictedPointerParameters => {
Self::UNRESTRICTED_POINTER_PARAMETERS
}
UnimplementedLanguageExtension::PointerCompositeAccess => {
Self::POINTER_COMPOSITE_ACCESS
}
},
}
}
}
/// A variant of [`LanguageExtension::Implemented`].
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub(crate) enum ImplementedLanguageExtension {}
/// A variant of [`LanguageExtension::Unimplemented`].
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub(crate) enum UnimplementedLanguageExtension {
ReadOnlyAndReadWriteStorageTextures,
Packed4x8IntegerDotProduct,
UnrestrictedPointerParameters,
PointerCompositeAccess,
}
impl UnimplementedLanguageExtension {
pub(crate) const fn tracking_issue_num(self) -> u16 {
match self {
Self::ReadOnlyAndReadWriteStorageTextures => 6204,
Self::Packed4x8IntegerDotProduct => 6445,
Self::UnrestrictedPointerParameters => 5158,
Self::PointerCompositeAccess => 6192,
}
}
}