Struct qt_gui::q_surface_format::SwapBehavior

#[repr(transparent)]
pub struct SwapBehavior(_);

This enum is used by QSurfaceFormat to specify the swap behaviour of a surface. The swap behaviour is mostly transparent to the application, but it affects factors such as rendering latency and throughput.

C++ enum: QSurfaceFormat::SwapBehavior.

C++ documentation:

This enum is used by QSurfaceFormat to specify the swap behaviour of a surface. The swap behaviour is mostly transparent to the application, but it affects factors such as rendering latency and throughput.

Methods

impl SwapBehavior

pub fn to_int(&self) -> c_int

impl SwapBehavior

pub const DefaultSwapBehavior: SwapBehavior

The default, unspecified swap behaviour of the platform. (C++ enum variant: DefaultSwapBehavior = 0)

pub const SingleBuffer: SwapBehavior

Used to request single buffering, which might result in flickering when OpenGL rendering is done directly to screen without an intermediate offscreen buffer. (C++ enum variant: SingleBuffer = 1)

pub const DoubleBuffer: SwapBehavior

This is typically the default swap behaviour on desktop platforms, consisting of one back buffer and one front buffer. Rendering is done to the back buffer, and then the back buffer and front buffer are swapped, or the contents of the back buffer are copied to the front buffer, depending on the implementation. (C++ enum variant: DoubleBuffer = 2)

pub const TripleBuffer: SwapBehavior

This swap behaviour is sometimes used in order to decrease the risk of skipping a frame when the rendering rate is just barely keeping up with the screen refresh rate. Depending on the platform it might also lead to slightly more efficient use of the GPU due to improved pipelining behaviour. Triple buffering comes at the cost of an extra frame of memory usage and latency, and might not be supported depending on the underlying platform. (C++ enum variant: TripleBuffer = 3)

Trait Implementations

impl Clone for SwapBehavior

fn clone(&self) -> SwapBehavior

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for SwapBehavior

impl Debug for SwapBehavior

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

Formats the value using the given formatter.

impl Eq for SwapBehavior

impl From<SwapBehavior> for c_int

fn from(value: SwapBehavior) -> Self

Performs the conversion.

impl From<i32> for SwapBehavior

fn from(value: c_int) -> Self

Performs the conversion.

impl PartialEq<SwapBehavior> for SwapBehavior

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

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

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

This method tests for !=.

impl StructuralEq for SwapBehavior

impl StructuralPartialEq for SwapBehavior