Enum web_glitz::pipeline::graphics::Viewport

pub enum Viewport {
    Region((i32, i32), u32, u32),
    Auto,
}

Describes the viewport used by by a [GraphicsPipeline].

The viewport defines the affine transformation of X and Y from normalized device coordinates to window coordinates.

Given a viewport with origin (X_vp, Y_vp), width width and height height; let X_nd and Y_nd be normalized device coordinates, then the corresponding window coordinates X_w and Y_w are computed as:

X_w = (X_nd + 1) * 0.5 * width + X_vp

Y_w = (X_nd + 1) * 0.5 * height + Y_vp

There are two ways to define a Viewport:

1. With explicit values:

   use web_glitz::pipeline::graphics::Viewport;
   
   let viewport = Viewport::Region((X_vp, Y_vp), width, height);

   Where X_vp, Y_vp, width and height correspond to the values used in the description above.

2. With automatic values:

   use web_glitz::pipeline::graphics::Viewport;
   
   let viewport = Viewport::Auto;

   In this case, the origin will always be (0, 0); determination of the width and height is deferred until draw time, where they taken to be the width and height of the [RenderTarget] that is being drawn to, such that the viewport will cover the [RenderTarget] exactly. Note that the width and height of the [RenderTarget] are determined by the attached images with the smallest width and height respectively.

Variants

Region((i32, i32), u32, u32)

Auto

Trait Implementations

impl Clone for Viewport

fn clone(&self) -> Viewport

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Viewport

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

Formats the value using the given formatter.

impl PartialEq<Viewport> for Viewport

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

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

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

This method tests for !=.

impl StructuralPartialEq for Viewport