Enum PresentMode

#[repr(C)]
pub enum PresentMode {
    AutoVsync = 0,
    AutoNoVsync = 1,
    Fifo = 2,
    FifoRelaxed = 3,
    Immediate = 4,
    Mailbox = 5,
}

Presentation mode for a Window.

The presentation mode specifies when a frame is presented to the window. The Fifo option corresponds to a traditional VSync, where the framerate is capped by the display refresh rate. Both Immediate and Mailbox are low-latency and are not capped by the refresh rate, but may not be available on all platforms. Tearing may be observed with Immediate mode, but will not be observed with Mailbox or Fifo.

AutoVsync or AutoNoVsync will gracefully fallback to Fifo when unavailable.

Immediate or Mailbox will panic if not supported by the platform.

Variants

AutoVsync = 0

Chooses FifoRelaxed -> Fifo based on availability.

Because of the fallback behavior, it is supported everywhere.

AutoNoVsync = 1

Chooses Immediate -> Mailbox -> Fifo (on web) based on availability.

Because of the fallback behavior, it is supported everywhere.

Fifo = 2

Presentation frames are kept in a First-In-First-Out queue approximately 3 frames long. Every vertical blanking period, the presentation engine will pop a frame off the queue to display. If there is no frame to display, it will present the same frame again until the next vblank.

When a present command is executed on the gpu, the presented image is added on the queue.

No tearing will be observed.

Calls to get_current_texture will block until there is a spot in the queue.

Supported on all platforms.

If you don’t know what mode to choose, choose this mode. This is traditionally called “Vsync On”.

FifoRelaxed = 3

Presentation frames are kept in a First-In-First-Out queue approximately 3 frames long. Every vertical blanking period, the presentation engine will pop a frame off the queue to display. If there is no frame to display, it will present the same frame until there is a frame in the queue. The moment there is a frame in the queue, it will immediately pop the frame off the queue.

When a present command is executed on the gpu, the presented image is added on the queue.

Tearing will be observed if frames last more than one vblank as the front buffer.

Calls to get_current_texture will block until there is a spot in the queue.

Supported on AMD on Vulkan.

This is traditionally called “Adaptive Vsync”

Immediate = 4

Presentation frames are not queued at all. The moment a present command is executed on the GPU, the presented image is swapped onto the front buffer immediately.

Tearing can be observed.

Supported on most platforms except older DX12 and Wayland.

This is traditionally called “Vsync Off”.

Mailbox = 5

Presentation frames are kept in a single-frame queue. Every vertical blanking period, the presentation engine will pop a frame from the queue. If there is no frame to display, it will present the same frame again until the next vblank.

When a present command is executed on the gpu, the frame will be put into the queue. If there was already a frame in the queue, the new frame will replace the old frame on the queue.

No tearing will be observed.

Supported on DX11/12 on Windows 10, NVidia on Vulkan and Wayland on Vulkan.

This is traditionally called “Fast Vsync”

Trait Implementations

impl Clone for PresentMode

fn clone(&self) -> PresentMode

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PresentMode

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

Formats the value using the given formatter.

impl Default for PresentMode

fn default() -> PresentMode

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for PresentMode

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Enum for PresentMode

where Self: Any + Send + Sync,

fn field(&self, __name_param: &str) -> Option<&dyn Reflect>

Returns a reference to the value of the field (in the current variant) with the given name.

fn field_at(&self, __index_param: usize) -> Option<&dyn Reflect>

Returns a reference to the value of the field (in the current variant) at the given index.

fn field_mut(&mut self, __name_param: &str) -> Option<&mut dyn Reflect>

Returns a mutable reference to the value of the field (in the current variant) with the given name.

fn field_at_mut(&mut self, __index_param: usize) -> Option<&mut dyn Reflect>

Returns a mutable reference to the value of the field (in the current variant) at the given index.

fn index_of(&self, __name_param: &str) -> Option<usize>

Returns the index of the field (in the current variant) with the given name.

fn name_at(&self, __index_param: usize) -> Option<&str>

Returns the name of the field (in the current variant) with the given index.

fn iter_fields(&self) -> VariantFieldIter<'_>

Returns an iterator over the values of the current variant’s fields.

fn field_len(&self) -> usize

Returns the number of fields in the current variant.

fn variant_name(&self) -> &str

The name of the current variant.

fn variant_index(&self) -> usize

The index of the current variant.

fn variant_type(&self) -> VariantType

The type of the current variant.

fn clone_dynamic(&self) -> DynamicEnum

fn is_variant(&self, variant_type: VariantType) -> bool

Returns true if the current variant’s type matches the given one.

fn variant_path(&self) -> String

Returns the full path to the current variant.

impl FromReflect for PresentMode

where Self: Any + Send + Sync,

fn from_reflect(__param0: &dyn Reflect) -> Option<Self>

Constructs a concrete instance of Self from a reflected value.

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

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

impl GetTypeRegistration for PresentMode

where Self: 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 PresentMode

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 PartialEq for PresentMode

fn eq(&self, other: &PresentMode) -> 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 Reflect for PresentMode

where Self: Any + Send + Sync,

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

Returns the TypeInfo of the type represented by this value.

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

Returns the value as a Box<dyn Any>.

fn as_any(&self) -> &dyn Any

Returns the value as a &dyn Any.

fn as_any_mut(&mut self) -> &mut dyn Any

Returns the value as a &mut dyn Any.

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

Casts this type to a boxed reflected value.

fn as_reflect(&self) -> &dyn Reflect

Casts this type to a reflected value.

fn as_reflect_mut(&mut self) -> &mut dyn Reflect

Casts this type to a mutable reflected value.

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

Clones the value as a Reflect trait object.

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

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

fn try_apply(&mut self, __value_param: &dyn Reflect) -> 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<Self>) -> ReflectOwned

Returns an owned enumeration of “kinds” of type.

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

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

fn reflect_partial_eq(&self, value: &dyn Reflect) -> Option<bool>

Returns a “partial equality” comparison result.

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

Debug formatter for the value.

fn apply(&mut self, value: &(dyn Reflect + '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 Serialize for PresentMode

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl TypePath for PresentMode

where Self: 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 PresentMode

where Self: Any + Send + Sync,

fn type_info() -> &'static TypeInfo

Returns the compile-time info for the underlying type.

impl Copy for PresentMode

impl Eq for PresentMode

impl StructuralPartialEq for PresentMode