Trait encase::ShaderType

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pub trait ShaderType {
    // Provided methods
    fn min_size() -> NonZeroU64 { ... }
    fn size(&self) -> NonZeroU64 { ... }
    fn assert_uniform_compat() { ... }
}
Expand description

Base trait for all WGSL host-shareable types

Provided Methods§

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fn min_size() -> NonZeroU64

Represents the minimum size of Self (equivalent to GPUBufferBindingLayout.minBindingSize)

For WGSL fixed-footprint types it represents WGSL Size (equivalent to ShaderSize::SHADER_SIZE)

For WGSL runtime-sized arrays and WGSL structs containing runtime-sized arrays (non fixed-footprint types) this will be calculated by assuming the array has one element

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fn size(&self) -> NonZeroU64

Returns the size of Self at runtime

For WGSL fixed-footprint types it’s equivalent to Self::min_size and ShaderSize::SHADER_SIZE

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fn assert_uniform_compat()

Asserts that Self meets the requirements of the uniform address space restrictions on stored values and the uniform address space layout constraints

Examples
Array

Will panic since runtime-sized arrays are not compatible with the uniform address space restrictions on stored values

<Vec<mint::Vector4<f32>>>::assert_uniform_compat();

Will panic since the stride is 4 bytes

<[f32; 2]>::assert_uniform_compat();

Will not panic since the stride is 16 bytes

<[mint::Vector4<f32>; 2]>::assert_uniform_compat();
Struct

Will panic since runtime-sized arrays are not compatible with the uniform address space restrictions on stored values

#[derive(ShaderType)]
struct Invalid {
    #[size(runtime)]
    vec: Vec<mint::Vector4<f32>>
}
Invalid::assert_uniform_compat();

Will panic since the inner struct’s size must be a multiple of 16

#[derive(ShaderType)]
struct S {
    x: f32,
}

#[derive(ShaderType)]
struct Invalid {
    a: f32,
    b: S, // offset between fields 'a' and 'b' must be at least 16 (currently: 4)
}
Invalid::assert_uniform_compat();

Will not panic (fixed via align attribute)

#[derive(ShaderType)]
struct Valid {
    a: f32,
    #[align(16)]
    b: S,
}
Valid::assert_uniform_compat();

Will not panic (fixed via size attribute)

#[derive(ShaderType)]
struct Valid {
    #[size(16)]
    a: f32,
    b: S,
}
Valid::assert_uniform_compat();

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl ShaderType for Option<NonZeroI32>

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impl ShaderType for Option<NonZeroU32>

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impl ShaderType for f32

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impl ShaderType for i32

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impl ShaderType for u32

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impl ShaderType for Mat3
where f32: ShaderSize,

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impl ShaderType for Mat2
where f32: ShaderSize,

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impl ShaderType for Mat4
where f32: ShaderSize,

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impl ShaderType for Vec4
where f32: ShaderSize,

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impl ShaderType for Vec2
where f32: ShaderSize,

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impl ShaderType for Vec3
where f32: ShaderSize,

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impl ShaderType for IVec2
where i32: ShaderSize,

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impl ShaderType for IVec3
where i32: ShaderSize,

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impl ShaderType for IVec4
where i32: ShaderSize,

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impl ShaderType for UVec2
where u32: ShaderSize,

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impl ShaderType for UVec3
where u32: ShaderSize,

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impl ShaderType for UVec4
where u32: ShaderSize,

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impl ShaderType for Wrapping<i32>

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impl ShaderType for Wrapping<u32>

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impl ShaderType for AtomicI32

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impl ShaderType for AtomicU32

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impl<T> ShaderType for Cow<'_, T>
where T: ShaderType + ?Sized + ToOwned<Owned = T>,

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impl<T> ShaderType for &T
where T: ShaderType + ?Sized,

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impl<T> ShaderType for &mut T
where T: ShaderType + ?Sized,

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impl<T> ShaderType for [T]
where T: ShaderType + ShaderSize, Self: Length,

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impl<T> ShaderType for Box<T>
where T: ShaderType + ?Sized,

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impl<T> ShaderType for LinkedList<T>
where T: ShaderType + ShaderSize, Self: Length,

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impl<T> ShaderType for VecDeque<T>
where T: ShaderType + ShaderSize, Self: Length,

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impl<T> ShaderType for Rc<T>
where T: ShaderType + ?Sized,

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impl<T> ShaderType for Arc<T>
where T: ShaderType + ?Sized,

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impl<T> ShaderType for Vec<T>
where T: ShaderType + ShaderSize, Self: Length,

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impl<T> ShaderType for Cell<T>
where T: ShaderType + ?Sized + Copy,

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impl<T: ShaderType + ShaderSize, const N: usize> ShaderType for [T; N]

Implementors§