naga::ir

Enum EarlyDepthTest

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pub enum EarlyDepthTest {
    Force,
    Allow {
        conservative: ConservativeDepth,
    },
}
Expand description

Explicitly allows early depth/stencil tests.

Normally, depth/stencil tests are performed after fragment shading. However, as an optimization, most drivers will move the depth/stencil tests before fragment shading if this does not have any observable consequences. This optimization is disabled under the following circumstances:

  • discard is called in the fragment shader.
  • The fragment shader writes to the depth buffer.
  • The fragment shader writes to any storage bindings.

When EarlyDepthTest is set, it is allowed to perform an early depth/stencil test even if the above conditions are not met. When EarlyDepthTest::Force is used, depth/stencil tests must be performed before fragment shading.

To force early depth/stencil tests in a shader:

  • GLSL: layout(early_fragment_tests) in;
  • HLSL: Attribute earlydepthstencil
  • SPIR-V: ExecutionMode EarlyFragmentTests
  • WGSL: @early_depth_test(force)

This may also be enabled in a shader by specifying a ConservativeDepth.

For more, see:

Variants§

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Force

Requires depth/stencil tests to be performed before fragment shading.

This will disable depth/stencil tests after fragment shading, so discarding the fragment or overwriting the fragment depth will have no effect.

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Allow

Allows an additional depth/stencil test to be performed before fragment shading.

It is up to the driver to decide whether early tests are performed. Unlike Force, this does not disable depth/stencil tests after fragment shading.

Fields

§conservative: ConservativeDepth

Specifies restrictions on how the depth value can be modified within the fragment shader.

This may be taken into account when deciding whether to perform early tests.

Trait Implementations§

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impl<'arbitrary> Arbitrary<'arbitrary> for EarlyDepthTest

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fn arbitrary(u: &mut Unstructured<'arbitrary>) -> Result<Self>

Generate an arbitrary value of Self from the given unstructured data. Read more
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fn arbitrary_take_rest(u: Unstructured<'arbitrary>) -> Result<Self>

Generate an arbitrary value of Self from the entirety of the given unstructured data. Read more
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fn size_hint(depth: usize) -> (usize, Option<usize>)

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself. Read more
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fn try_size_hint( depth: usize, ) -> Result<(usize, Option<usize>), MaxRecursionReached>

Get a size hint for how many bytes out of an Unstructured this type needs to construct itself. Read more
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impl Clone for EarlyDepthTest

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fn clone(&self) -> EarlyDepthTest

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for EarlyDepthTest

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'de> Deserialize<'de> for EarlyDepthTest

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Hash for EarlyDepthTest

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for EarlyDepthTest

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fn cmp(&self, other: &EarlyDepthTest) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized,

Restrict a value to a certain interval. Read more
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impl PartialEq for EarlyDepthTest

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fn eq(&self, other: &EarlyDepthTest) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for EarlyDepthTest

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fn partial_cmp(&self, other: &EarlyDepthTest) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Serialize for EarlyDepthTest

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl Copy for EarlyDepthTest

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impl Eq for EarlyDepthTest

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impl StructuralPartialEq for EarlyDepthTest

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<Q, K> Comparable<K> for Q
where Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,

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impl<N> NodeTrait for N
where N: Copy + Ord + Hash,