Bounds pending UI submissions while retaining only the most recent input request. More...

#include "donner/editor/gui/EditorWindow.h"

Classes
struct	Fence
	One submitted UI frame: the GPU serial that retires it and the input it presented. More...
struct	CompletionObservation
	Serial and clock read after a bounded GPU completion confirmation. More...

Public Types
enum class	Admission { Ready , Busy , TimedOut }
	Whether another UI frame may be submitted. More...
using	Clock = std::chrono::steady_clock
	Clock that times pending submissions.

Public Member Functions
Admission	observe (std::uint64_t completedSerial, Clock::time_point now, std::optional< Clock::time_point > lastProgress=std::nullopt)
	Observe completion before admitting a frame; a stopped queue reaches a finite deadline.
template<typename CompletionProbe> requires std::invocable<CompletionProbe&>
Admission	observe (std::uint64_t completedSerial, Clock::time_point now, CompletionProbe &&confirmCompletion)
	Recheck an expired submission using a bounded completion query.
void	submitted (Fence fence)
	Seal the serial and input that reached the GPU as one UI frame.
std::size_t	pendingCount () const
	Number of submitted frames whose GPU work has not been observed complete.
Fence	completed () const
	Most recently retired frame, or a default fence before any frame retires.
std::uint64_t	oldestSerial () const
	Serial of the oldest pending frame, or zero when none is pending.
std::chrono::milliseconds	oldestAge (Clock::time_point now) const
	Elapsed time of the oldest unfinished frame without restarting its submission clock.

Static Public Attributes
static constexpr std::chrono::seconds	kCompletionDeadline {5}
	How long the oldest pending submission may stay unfinished while the device makes no progress.

Friends
std::ostream &	operator<< (std::ostream &os, Admission admission)
	Ostream output operator, e.g. Busy.

Detailed Description

Bounds pending UI submissions while retaining only the most recent input request.

Class Documentation

◆ donner::editor::gui::internal::PresentationSubmissionQueue::Fence

struct donner::editor::gui::internal::PresentationSubmissionQueue::Fence

One submitted UI frame: the GPU serial that retires it and the input it presented.

Class Members
uint64_t	captureId = 0	Raster capture paired with the frame.
uint64_t	frameId = 0	Presentation frame identity.
bool	inputRepresented = false	Whether the frame represents the input sealed with it; cleared when the full frame was not presented.
bool	mouseDown = false	Whether the primary button was down when sealed.
double	pointerX = 0.0	Pointer x position when the frame was sealed.
double	pointerY = 0.0	Pointer y position when the frame was sealed.
uint64_t	serial = 0	Last GPU submission serial of the frame.
time_point	submittedAt	When the frame's work was submitted.
double	viewportZoom = 0.0	Viewport zoom the frame was drawn with.

◆ donner::editor::gui::internal::PresentationSubmissionQueue::CompletionObservation

struct donner::editor::gui::internal::PresentationSubmissionQueue::CompletionObservation

Serial and clock read after a bounded GPU completion confirmation.

Class Members
time_point	observedAt	When the completion was observed.
uint64_t	serial	Highest completed submission serial observed.

Member Enumeration Documentation

◆ Admission

enum class donner::editor::gui::internal::PresentationSubmissionQueue::Admission

strong

Whether another UI frame may be submitted.

Enumerator
Ready	Fewer than three submissions are pending and none has timed out.
Busy	At least three submissions are pending and none has timed out. The oldest pending submission has waited at least kCompletionDeadline, and the work it waits behind has made no progress for that long either.

Member Function Documentation

◆ observe()

Admission donner::editor::gui::internal::PresentationSubmissionQueue::observe	(	std::uint64_t	completedSerial,
		Clock::time_point	now,
		std::optional< Clock::time_point >	lastProgress = std::nullopt )

inline

Observe completion before admitting a frame; a stopped queue reaches a finite deadline.

A frame's work completes only after everything queued ahead of it, so an old frame behind a device that is still finishing work is slow, not stopped: it times out only once the device has also made no progress for kCompletionDeadline.

Parameters

completedSerial	Highest submission serial the device has completed.
now	Current time.
lastProgress	When the device last made progress, or nothing when it does not track progress, in which case the oldest frame's age alone reaches the deadline.

◆ operator<<

std::ostream & operator<<	(	std::ostream &	os,
		Admission	admission )

friend

Ostream output operator, e.g. Busy.

Parameters

os	Output stream.
admission	Value to output.

The documentation for this class was generated from the following file:

donner/editor/gui/EditorWindow.h

Classes

Public Types

Public Member Functions

Static Public Attributes

Friends