Struct RenderAssetUsages

pub struct RenderAssetUsages(/* private fields */);

Defines where the asset will be used.

If an asset is set to the RENDER_WORLD but not the MAIN_WORLD, the asset will be unloaded from the asset server once it’s been extracted and prepared in the render world.

Unloading the asset saves on memory, as for most cases it is no longer necessary to keep it in RAM once it’s been uploaded to the GPU’s VRAM. However, this means you can no longer access the asset from the CPU (via the Assets<T> resource) once unloaded (without re-loading it).

If you never need access to the asset from the CPU past the first frame it’s loaded on, or only need very infrequent access, then set this to RENDER_WORLD. Otherwise, set this to RENDER_WORLD | MAIN_WORLD.

If you have an asset that doesn’t actually need to end up in the render world, like an Image that will be decoded into another Image asset, use MAIN_WORLD only.

Platform-specific

On Wasm, it is not possible for now to free reserved memory. To control memory usage, load assets in sequence and unload one before loading the next. See this discussion about memory management for more details.

Implementations

impl RenderAssetUsages

pub const MAIN_WORLD: RenderAssetUsages = _

pub const RENDER_WORLD: RenderAssetUsages = _

impl RenderAssetUsages

pub const fn empty() -> RenderAssetUsages

Get a flags value with all bits unset.

pub const fn all() -> RenderAssetUsages

Get a flags value with all known bits set.

Examples found in repository

examples/asset/alter_sprite.rs (line 69)

fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    let bird_left = Bird::Normal;
    let bird_right = Bird::Normal;
    commands.spawn(Camera2d);

    let texture_left = asset_server.load_with_settings(
        bird_left.get_texture_path(),
        // `RenderAssetUsages::all()` is already the default, so the line below could be omitted.
        // It's helpful to know it exists, however.
        //
        // `RenderAssetUsages` tell Bevy whether to keep the data around:
        //   - for the GPU (`RenderAssetUsages::RENDER_WORLD`),
        //   - for the CPU (`RenderAssetUsages::MAIN_WORLD`),
        //   - or both.
        // `RENDER_WORLD` is necessary to render the image, `MAIN_WORLD` is necessary to inspect
        // and modify the image (via `ResMut<Assets<Image>>`).
        //
        // Since most games will not need to modify textures at runtime, many developers opt to pass
        // only `RENDER_WORLD`. This is more memory efficient, as we don't need to keep the image in
        // RAM. For this example however, this would not work, as we need to inspect and modify the
        // image at runtime.
        |settings: &mut ImageLoaderSettings| settings.asset_usage = RenderAssetUsages::all(),
    );

    commands.spawn((
        Name::new("Bird Left"),
        // This marker component ensures we can easily find either of the Birds by using With and
        // Without query filters.
        Left,
        Sprite::from_image(texture_left),
        Transform::from_xyz(-200.0, 0.0, 0.0),
        bird_left,
    ));

    commands.spawn((
        Name::new("Bird Right"),
        // In contrast to the above, here we rely on the default `RenderAssetUsages` loader setting
        Sprite::from_image(asset_server.load(bird_right.get_texture_path())),
        Transform::from_xyz(200.0, 0.0, 0.0),
        bird_right,
    ));
}

examples/asset/alter_mesh.rs (line 86)

fn setup(
    mut commands: Commands,
    asset_server: Res<AssetServer>,
    mut materials: ResMut<Assets<StandardMaterial>>,
) {
    let left_shape = Shape::Cube;
    let right_shape = Shape::Cube;

    // In normal use, you can call `asset_server.load`, however see below for an explanation of
    // `RenderAssetUsages`.
    let left_shape_model = asset_server.load_with_settings(
        GltfAssetLabel::Primitive {
            mesh: 0,
            // This field stores an index to this primitive in its parent mesh. In this case, we
            // want the first one. You might also have seen the syntax:
            //
            //     models/cube/cube.gltf#Scene0
            //
            // which accomplishes the same thing.
            primitive: 0,
        }
        .from_asset(left_shape.get_model_path()),
        // `RenderAssetUsages::all()` is already the default, so the line below could be omitted.
        // It's helpful to know it exists, however.
        //
        // `RenderAssetUsages` tell Bevy whether to keep the data around:
        //   - for the GPU (`RenderAssetUsages::RENDER_WORLD`),
        //   - for the CPU (`RenderAssetUsages::MAIN_WORLD`),
        //   - or both.
        // `RENDER_WORLD` is necessary to render the mesh, `MAIN_WORLD` is necessary to inspect
        // and modify the mesh (via `ResMut<Assets<Mesh>>`).
        //
        // Since most games will not need to modify meshes at runtime, many developers opt to pass
        // only `RENDER_WORLD`. This is more memory efficient, as we don't need to keep the mesh in
        // RAM. For this example however, this would not work, as we need to inspect and modify the
        // mesh at runtime.
        |settings: &mut GltfLoaderSettings| settings.load_meshes = RenderAssetUsages::all(),
    );

    // Here, we rely on the default loader settings to achieve a similar result to the above.
    let right_shape_model = asset_server.load(
        GltfAssetLabel::Primitive {
            mesh: 0,
            primitive: 0,
        }
        .from_asset(right_shape.get_model_path()),
    );

    // Add a material asset directly to the materials storage
    let material_handle = materials.add(StandardMaterial {
        base_color: Color::srgb(0.6, 0.8, 0.6),
        ..default()
    });

    commands.spawn((
        Left,
        Name::new("Left Shape"),
        Mesh3d(left_shape_model),
        MeshMaterial3d(material_handle.clone()),
        Transform::from_xyz(-3.0, 0.0, 0.0),
        left_shape,
    ));

    commands.spawn((
        Name::new("Right Shape"),
        Mesh3d(right_shape_model),
        MeshMaterial3d(material_handle),
        Transform::from_xyz(3.0, 0.0, 0.0),
        right_shape,
    ));

    commands.spawn((
        Name::new("Point Light"),
        PointLight::default(),
        Transform::from_xyz(4.0, 5.0, 4.0),
    ));

    commands.spawn((
        Name::new("Camera"),
        Camera3d::default(),
        Transform::from_xyz(0.0, 3.0, 20.0).looking_at(Vec3::ZERO, Vec3::Y),
    ));
}

pub const fn bits(&self) -> u8

Get the underlying bits value.

The returned value is exactly the bits set in this flags value.

pub const fn from_bits(bits: u8) -> Option<RenderAssetUsages>

Convert from a bits value.

This method will return None if any unknown bits are set.

pub const fn from_bits_truncate(bits: u8) -> RenderAssetUsages

Convert from a bits value, unsetting any unknown bits.

pub const fn from_bits_retain(bits: u8) -> RenderAssetUsages

Convert from a bits value exactly.

pub fn from_name(name: &str) -> Option<RenderAssetUsages>

Get a flags value with the bits of a flag with the given name set.

This method will return None if name is empty or doesn’t correspond to any named flag.

pub const fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

pub const fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

pub const fn intersects(&self, other: RenderAssetUsages) -> bool

Whether any set bits in a source flags value are also set in a target flags value.

pub const fn contains(&self, other: RenderAssetUsages) -> bool

Whether all set bits in a source flags value are also set in a target flags value.

pub fn insert(&mut self, other: RenderAssetUsages)

The bitwise or (|) of the bits in two flags values.

pub fn remove(&mut self, other: RenderAssetUsages)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. remove won’t truncate other, but the ! operator will.

pub fn toggle(&mut self, other: RenderAssetUsages)

The bitwise exclusive-or (^) of the bits in two flags values.

pub fn set(&mut self, other: RenderAssetUsages, value: bool)

Call insert when value is true or remove when value is false.

pub const fn intersection(self, other: RenderAssetUsages) -> RenderAssetUsages

The bitwise and (&) of the bits in two flags values.

pub const fn union(self, other: RenderAssetUsages) -> RenderAssetUsages

The bitwise or (|) of the bits in two flags values.

pub const fn difference(self, other: RenderAssetUsages) -> RenderAssetUsages

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

pub const fn symmetric_difference( self, other: RenderAssetUsages, ) -> RenderAssetUsages

The bitwise exclusive-or (^) of the bits in two flags values.

pub const fn complement(self) -> RenderAssetUsages

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl RenderAssetUsages

pub const fn iter(&self) -> Iter<RenderAssetUsages>

Yield a set of contained flags values.

Each yielded flags value will correspond to a defined named flag. Any unknown bits will be yielded together as a final flags value.

pub const fn iter_names(&self) -> IterNames<RenderAssetUsages>

Yield a set of contained named flags values.

This method is like iter, except only yields bits in contained named flags. Any unknown bits, or bits not corresponding to a contained flag will not be yielded.

Trait Implementations

impl Binary for RenderAssetUsages

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

Formats the value using the given formatter.

impl BitAnd for RenderAssetUsages

fn bitand(self, other: RenderAssetUsages) -> RenderAssetUsages

The bitwise and (&) of the bits in two flags values.

type Output = RenderAssetUsages

The resulting type after applying the & operator.

impl BitAndAssign for RenderAssetUsages

fn bitand_assign(&mut self, other: RenderAssetUsages)

The bitwise and (&) of the bits in two flags values.

impl BitOr for RenderAssetUsages

fn bitor(self, other: RenderAssetUsages) -> RenderAssetUsages

The bitwise or (|) of the bits in two flags values.

type Output = RenderAssetUsages

The resulting type after applying the | operator.

impl BitOrAssign for RenderAssetUsages

fn bitor_assign(&mut self, other: RenderAssetUsages)

The bitwise or (|) of the bits in two flags values.

impl BitXor for RenderAssetUsages

fn bitxor(self, other: RenderAssetUsages) -> RenderAssetUsages

The bitwise exclusive-or (^) of the bits in two flags values.

type Output = RenderAssetUsages

The resulting type after applying the ^ operator.

impl BitXorAssign for RenderAssetUsages

fn bitxor_assign(&mut self, other: RenderAssetUsages)

The bitwise exclusive-or (^) of the bits in two flags values.

impl Clone for RenderAssetUsages

fn clone(&self) -> RenderAssetUsages

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for RenderAssetUsages

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

Formats the value using the given formatter.

impl Default for RenderAssetUsages

fn default() -> RenderAssetUsages

Returns the default render asset usage flags: RenderAssetUsages::MAIN_WORLD | RenderAssetUsages::RENDER_WORLD

This default configuration ensures the asset persists in the main world, even after being prepared for rendering.

If your asset does not change, consider using RenderAssetUsages::RENDER_WORLD exclusively. This will cause the asset to be unloaded from the main world once it has been prepared for rendering. If the asset does not need to reach the render world at all, use RenderAssetUsages::MAIN_WORLD exclusively.

impl<'de> Deserialize<'de> for RenderAssetUsages

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Extend<RenderAssetUsages> for RenderAssetUsages

fn extend<T>(&mut self, iterator: T)

where T: IntoIterator<Item = RenderAssetUsages>,

The bitwise or (|) of the bits in each flags value.

fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)

Reserves capacity in a collection for the given number of additional elements.

impl Flags for RenderAssetUsages

const FLAGS: &'static [Flag<RenderAssetUsages>] = _

The set of defined flags.

type Bits = u8

The underlying bits type.

fn bits(&self) -> u8

Get the underlying bits value.

fn from_bits_retain(bits: u8) -> RenderAssetUsages

Convert from a bits value exactly.

fn empty() -> Self

Get a flags value with all bits unset.

fn all() -> Self

Get a flags value with all known bits set.

fn from_bits(bits: Self::Bits) -> Option<Self>

Convert from a bits value.

fn from_bits_truncate(bits: Self::Bits) -> Self

Convert from a bits value, unsetting any unknown bits.

fn from_name(name: &str) -> Option<Self>

Get a flags value with the bits of a flag with the given name set.

fn iter(&self) -> Iter<Self>

Yield a set of contained flags values.

fn iter_names(&self) -> IterNames<Self>

Yield a set of contained named flags values.

fn is_empty(&self) -> bool

Whether all bits in this flags value are unset.

fn is_all(&self) -> bool

Whether all known bits in this flags value are set.

fn intersects(&self, other: Self) -> bool

where Self: Sized,

Whether any set bits in a source flags value are also set in a target flags value.

fn contains(&self, other: Self) -> bool

where Self: Sized,

Whether all set bits in a source flags value are also set in a target flags value.

fn insert(&mut self, other: Self)

where Self: Sized,

The bitwise or (|) of the bits in two flags values.

fn remove(&mut self, other: Self)

where Self: Sized,

The intersection of a source flags value with the complement of a target flags value (&!).

fn toggle(&mut self, other: Self)

where Self: Sized,

The bitwise exclusive-or (^) of the bits in two flags values.

fn set(&mut self, other: Self, value: bool)

where Self: Sized,

Call Flags::insert when value is true or Flags::remove when value is false.

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

The bitwise and (&) of the bits in two flags values.

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

The bitwise or (|) of the bits in two flags values.

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

The intersection of a source flags value with the complement of a target flags value (&!).

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

The bitwise exclusive-or (^) of the bits in two flags values.

fn complement(self) -> Self

The bitwise negation (!) of the bits in a flags value, truncating the result.

impl FromArg for &'static RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

type This<'from_arg> = &'from_arg RenderAssetUsages

The type to convert into.

fn from_arg( arg: Arg<'_>, ) -> Result<<&'static RenderAssetUsages as FromArg>::This<'_>, ArgError>

Creates an item from an argument.

impl FromArg for &'static mut RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

type This<'from_arg> = &'from_arg mut RenderAssetUsages

The type to convert into.

fn from_arg( arg: Arg<'_>, ) -> Result<<&'static mut RenderAssetUsages as FromArg>::This<'_>, ArgError>

Creates an item from an argument.

impl FromArg for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

type This<'from_arg> = RenderAssetUsages

The type to convert into.

fn from_arg( arg: Arg<'_>, ) -> Result<<RenderAssetUsages as FromArg>::This<'_>, ArgError>

Creates an item from an argument.

impl FromIterator<RenderAssetUsages> for RenderAssetUsages

fn from_iter<T>(iterator: T) -> RenderAssetUsages

where T: IntoIterator<Item = RenderAssetUsages>,

The bitwise or (|) of the bits in each flags value.

impl FromReflect for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn from_reflect( reflect: &(dyn PartialReflect + 'static), ) -> Option<RenderAssetUsages>

Constructs a concrete instance of Self from a reflected value.

fn take_from_reflect( reflect: Box<dyn PartialReflect>, ) -> Result<Self, Box<dyn PartialReflect>>

Attempts to downcast the given value to Self using, constructing the value using from_reflect if that fails.

impl GetOwnership for &RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn ownership() -> Ownership

Returns the ownership of Self.

impl GetOwnership for &mut RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn ownership() -> Ownership

Returns the ownership of Self.

impl GetOwnership for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn ownership() -> Ownership

Returns the ownership of Self.

impl GetTypeRegistration for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn get_type_registration() -> TypeRegistration

Returns the default TypeRegistration for this type.

fn register_type_dependencies(registry: &mut TypeRegistry)

Registers other types needed by this type.

impl Hash for RenderAssetUsages

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

where __H: Hasher,

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 IntoIterator for RenderAssetUsages

type Item = RenderAssetUsages

The type of the elements being iterated over.

type IntoIter = Iter<RenderAssetUsages>

Which kind of iterator are we turning this into?

fn into_iter(self) -> <RenderAssetUsages as IntoIterator>::IntoIter

Creates an iterator from a value.

impl IntoReturn for &RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn into_return<'into_return>(self) -> Return<'into_return>

where &RenderAssetUsages: 'into_return,

Converts Self into a Return value.

impl IntoReturn for &mut RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn into_return<'into_return>(self) -> Return<'into_return>

where &mut RenderAssetUsages: 'into_return,

Converts Self into a Return value.

impl IntoReturn for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn into_return<'into_return>(self) -> Return<'into_return>

where RenderAssetUsages: 'into_return,

Converts Self into a Return value.

impl LowerHex for RenderAssetUsages

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

Formats the value using the given formatter.

impl Not for RenderAssetUsages

fn not(self) -> RenderAssetUsages

The bitwise negation (!) of the bits in a flags value, truncating the result.

type Output = RenderAssetUsages

The resulting type after applying the ! operator.

impl Octal for RenderAssetUsages

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

Formats the value using the given formatter.

impl PartialEq for RenderAssetUsages

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PartialReflect for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn get_represented_type_info(&self) -> Option<&'static TypeInfo>

Returns the TypeInfo of the type represented by this value.

fn clone_value(&self) -> Box<dyn PartialReflect>

Clones the value as a Reflect trait object.

fn try_apply( &mut self, value: &(dyn PartialReflect + 'static), ) -> Result<(), ApplyError>

Tries to apply a reflected value to this value.

fn reflect_kind(&self) -> ReflectKind

Returns a zero-sized enumeration of “kinds” of type.

fn reflect_ref(&self) -> ReflectRef<'_>

Returns an immutable enumeration of “kinds” of type.

fn reflect_mut(&mut self) -> ReflectMut<'_>

Returns a mutable enumeration of “kinds” of type.

fn reflect_owned(self: Box<RenderAssetUsages>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type.

fn try_into_reflect( self: Box<RenderAssetUsages>, ) -> Result<Box<dyn Reflect>, Box<dyn PartialReflect>>

Attempts to cast this type to a boxed, fully-reflected value.

fn try_as_reflect(&self) -> Option<&(dyn Reflect + 'static)>

Attempts to cast this type to a fully-reflected value.

fn try_as_reflect_mut(&mut self) -> Option<&mut (dyn Reflect + 'static)>

Attempts to cast this type to a mutable, fully-reflected value.

fn into_partial_reflect(self: Box<RenderAssetUsages>) -> Box<dyn PartialReflect>

Casts this type to a boxed, reflected value.

fn as_partial_reflect(&self) -> &(dyn PartialReflect + 'static)

Casts this type to a reflected value.

fn as_partial_reflect_mut(&mut self) -> &mut (dyn PartialReflect + 'static)

Casts this type to a mutable, reflected value.

fn reflect_hash(&self) -> Option<u64>

Returns a hash of the value (which includes the type).

fn reflect_partial_eq( &self, value: &(dyn PartialReflect + 'static), ) -> Option<bool>

Returns a “partial equality” comparison result.

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

Debug formatter for the value.

fn apply(&mut self, value: &(dyn PartialReflect + 'static))

Applies a reflected value to this value.

fn serializable(&self) -> Option<Serializable<'_>>

Returns a serializable version of the value.

fn is_dynamic(&self) -> bool

Indicates whether or not this type is a dynamic type.

impl Reflect for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn into_any(self: Box<RenderAssetUsages>) -> Box<dyn Any>

Returns the value as a Box<dyn Any>.

fn as_any(&self) -> &(dyn Any + 'static)

Returns the value as a &dyn Any.

fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)

Returns the value as a &mut dyn Any.

fn into_reflect(self: Box<RenderAssetUsages>) -> Box<dyn Reflect>

Casts this type to a boxed, fully-reflected value.

fn as_reflect(&self) -> &(dyn Reflect + 'static)

Casts this type to a fully-reflected value.

fn as_reflect_mut(&mut self) -> &mut (dyn Reflect + 'static)

Casts this type to a mutable, fully-reflected value.

fn set(&mut self, value: Box<dyn Reflect>) -> Result<(), Box<dyn Reflect>>

Performs a type-checked assignment of a reflected value to this value.

impl Serialize for RenderAssetUsages

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Sub for RenderAssetUsages

fn sub(self, other: RenderAssetUsages) -> RenderAssetUsages

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

type Output = RenderAssetUsages

The resulting type after applying the - operator.

impl SubAssign for RenderAssetUsages

fn sub_assign(&mut self, other: RenderAssetUsages)

The intersection of a source flags value with the complement of a target flags value (&!).

This method is not equivalent to self & !other when other has unknown bits set. difference won’t truncate other, but the ! operator will.

impl TypePath for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn type_path() -> &'static str

Returns the fully qualified path of the underlying type.

fn short_type_path() -> &'static str

Returns a short, pretty-print enabled path to the type.

fn type_ident() -> Option<&'static str>

Returns the name of the type, or None if it is anonymous.

fn crate_name() -> Option<&'static str>

Returns the name of the crate the type is in, or None if it is anonymous.

fn module_path() -> Option<&'static str>

Returns the path to the module the type is in, or None if it is anonymous.

impl Typed for RenderAssetUsages

where RenderAssetUsages: Any + Send + Sync,

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.

impl UpperHex for RenderAssetUsages

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

Formats the value using the given formatter.

impl Copy for RenderAssetUsages

impl Eq for RenderAssetUsages

impl StructuralPartialEq for RenderAssetUsages