Enum cogl::MaterialAlphaFunc

#[non_exhaustive]
pub enum MaterialAlphaFunc {
    Never,
    Less,
    Equal,
    Lequal,
    Greater,
    Notequal,
    Gequal,
    Always,
    // some variants omitted
}

Alpha testing happens before blending primitives with the framebuffer and gives an opportunity to discard fragments based on a comparison with the incoming alpha value and a reference alpha value. The MaterialAlphaFunc determines how the comparison is done.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Never

Never let the fragment through.

Less

Let the fragment through if the incoming alpha value is less than the reference alpha value

Equal

Let the fragment through if the incoming alpha value equals the reference alpha value

Lequal

Let the fragment through if the incoming alpha value is less than or equal to the reference alpha value

Greater

Let the fragment through if the incoming alpha value is greater than the reference alpha value

Notequal

Let the fragment through if the incoming alpha value does not equal the reference alpha value

Gequal

Let the fragment through if the incoming alpha value is greater than or equal to the reference alpha value.

Always

Always let the fragment through.

Trait Implementations

impl Clone for MaterialAlphaFunc

fn clone(&self) -> MaterialAlphaFunc

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for MaterialAlphaFunc

impl Debug for MaterialAlphaFunc

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

Formats the value using the given formatter.

impl Display for MaterialAlphaFunc

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

Formats the value using the given formatter.

impl Eq for MaterialAlphaFunc

impl<'a> FromValue<'a> for MaterialAlphaFunc

unsafe fn from_value(value: &Value) -> Self

Safety

impl<'a> FromValueOptional<'a> for MaterialAlphaFunc

unsafe fn from_value_optional(value: &Value) -> Option<Self>

Safety

impl Hash for MaterialAlphaFunc

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

Feeds this value into the given Hasher.

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

Feeds a slice of this type into the given Hasher.

impl Ord for MaterialAlphaFunc

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

This method returns an Ordering between self and other.

#[must_use]

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

Compares and returns the maximum of two values.

#[must_use]

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

Compares and returns the minimum of two values.

#[must_use]

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

Restrict a value to a certain interval.

impl PartialEq<MaterialAlphaFunc> for MaterialAlphaFunc

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

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

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

This method tests for !=.

impl PartialOrd<MaterialAlphaFunc> for MaterialAlphaFunc

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

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

#[must_use]

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

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

#[must_use]

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

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

#[must_use]

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

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

#[must_use]

pub 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 SetValue for MaterialAlphaFunc

unsafe fn set_value(value: &mut Value, this: &Self)

Safety

impl StaticType for MaterialAlphaFunc

fn static_type() -> Type

Returns the type identifier of Self.

impl StructuralEq for MaterialAlphaFunc

impl StructuralPartialEq for MaterialAlphaFunc