Struct PassViewport 

pub struct PassViewport {
    pub offset: [f32; 2],
    pub extent: Extent2D,
}

A clip space larger than the target it lands in, and where it lands.

A layer records its draws before anything is known about how much of the target they will cover. The geometry and every material go into clip space as they are recorded — docs/architecture.md states that a recording is tessellated geometry rather than a command list — so by the time the extent could be narrowed, narrowing it would mean rewriting all of that.

This narrows the target instead and leaves the recording alone. The viewport keeps the extent the geometry was recorded against, and offset slides it so that the wanted sub-rectangle lands on the target. Clip space maps onto the viewport, not onto the target, so the picture is cropped rather than scaled and every recorded coordinate still means what it meant.

offset is normally negative: a target holding the region starting at device (x, y) of the recorded space offsets by (-x, -y).

Fields

offset: [f32; 2]

Where the recorded space’s origin sits, in target pixels.

extent: Extent2D

The extent the geometry was recorded against.

Trait Implementations

impl Clone for PassViewport

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PassViewport

impl Debug for PassViewport

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

Formats the value using the given formatter.

impl PartialEq for PassViewport

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for PassViewport