Struct DoubleBufferedSubmitter

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pub struct DoubleBufferedSubmitter { /* private fields */ }

Expand description

Double-buffered GPU command submission.

Maintains two independent CommandBuffer slots (A and B). While the GPU executes the commands in slot B, the CPU records new work into slot A, and vice-versa. This overlaps CPU recording with GPU execution to maximise throughput.

§Typical cycle (one frame)

1. begin_record(recording_slot)   → SlotState::Recording
2. … record commands …
3. finish_record(recording_slot)  → SlotState::ReadyToSubmit
4. submit(recording_slot)         → SlotState::Inflight
5. mark_retired(other_slot)       → SlotState::Retired (after GPU fence)
6. reset(retired_slot)            → SlotState::Idle

Implementations§

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impl DoubleBufferedSubmitter

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pub fn new() -> Self

Create a new double-buffered submitter with both slots idle.

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pub fn state(&self, slot: BufferSlot) -> SlotState

Current state of slot.

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pub fn active_slot(&self) -> BufferSlot

The slot the CPU is currently (or will next) record into.

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pub fn frame_count(&self) -> u64

Total number of complete double-buffer cycles (frames) submitted.

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pub fn begin_record(&mut self, slot: BufferSlot) -> bool

Begin recording commands into slot.

Returns false if slot is not currently Idle.

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pub fn record(&mut self, slot: BufferSlot, entry: CommandEntry) -> bool

Record a command entry into the active recording slot.

Returns false if slot is not in Recording state.

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pub fn finish_record(&mut self, slot: BufferSlot) -> bool

Finish recording for slot.

Returns false if slot is not in Recording state.

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pub fn submit(&mut self, slot: BufferSlot) -> Option<Vec<CommandEntry>>

Submit the commands in slot to the (simulated) GPU queue.

Returns the submitted commands on success, or None if slot is not ReadyToSubmit.

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pub fn mark_retired(&mut self, slot: BufferSlot) -> bool

Mark slot as retired (GPU execution complete).

Returns false if slot is not Inflight.

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pub fn reset_slot(&mut self, slot: BufferSlot) -> bool

Reset slot to Idle so it can be recorded into again.

Returns false if slot is not Retired.

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pub fn command_count(&self, slot: BufferSlot) -> usize

Number of commands recorded in slot.

Trait Implementations§

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impl Default for DoubleBufferedSubmitter

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fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl UnwindSafe for DoubleBufferedSubmitter

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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> Downcast<T> for T

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fn downcast(&self) -> &T

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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 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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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