Enum naga::ConservativeDepth

pub enum ConservativeDepth {
    GreaterEqual,
    LessEqual,
    Unchanged,
}

Enables adjusting depth without disabling early Z.

To use in a shader:

• GLSL: layout (depth_<greater/less/unchanged/any>) out float gl_FragDepth;
  • depth_any option behaves as if the layout qualifier was not present.
• HLSL: SV_DepthGreaterEqual/SV_DepthLessEqual/SV_Depth
• SPIR-V: ExecutionMode Depth<Greater/Less/Unchanged>
• WGSL: @early_depth_test(greater_equal/less_equal/unchanged)

For more, see:

• https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_conservative_depth.txt
• https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-semantics#system-value-semantics
• https://www.khronos.org/registry/SPIR-V/specs/unified1/SPIRV.html#Execution_Mode

Variants

GreaterEqual

Shader may rewrite depth only with a value greater than calculated.

LessEqual

Shader may rewrite depth smaller than one that would have been written without the modification.

Unchanged

Shader may not rewrite depth value.

Trait Implementations

impl Clone for ConservativeDepth

fn clone(&self) -> ConservativeDepth

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ConservativeDepth

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

Formats the value using the given formatter.

impl Hash for ConservativeDepth

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

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for ConservativeDepth

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

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for ConservativeDepth

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

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for ConservativeDepth

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

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for ConservativeDepth

impl Eq for ConservativeDepth

impl StructuralPartialEq for ConservativeDepth