Enum BlendMode 

#[non_exhaustive]
pub enum BlendMode {
    Alpha,
    Screen,
    Overlay,
    Darken,
    Lighten,
    ColorDodge,
    ColorBurn,
    HardLight,
    SoftLight,
    Difference,
    Exclusion,
    Hue,
    Saturation,
    Color,
    Luminosity,
    Add,
    Multiply,
}

Blend mode for a VectorMesh, following the CSS mix-blend-mode vocabulary used by SVG/Lottie-style artwork. All variants are wired into the renderer: separable modes use fixed-function blending, the rest (marked below) isolate the mesh into a graphics layer and composite it with a custom shader.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Alpha

Standard premultiplied alpha blending (normal).

Screen

screen: 1 - (1 - S) * (1 - D). Fixed-function.

Overlay

overlay: Multiply for dark backdrops, Screen for light ones.

Darken

darken: per-channel min(S, D). Fixed-function.

Lighten

lighten: per-channel max(S, D). Fixed-function.

ColorDodge

color-dodge: brightens the backdrop toward the source color.

ColorBurn

color-burn: darkens the backdrop toward the source color.

HardLight

hard-light: Overlay with source and backdrop swapped.

SoftLight

soft-light: subtle Overlay variant.

Difference

difference: per-channel |S - D|. Needs the backdrop (fixed-function subtract only covers S - D), so it composites via an isolated layer.

Exclusion

exclusion: like difference with lower contrast.

Hue

hue: source hue with backdrop saturation and luminosity.

Saturation

saturation: source saturation with backdrop hue and luminosity.

Color

color: source hue and saturation with backdrop luminosity.

Luminosity

luminosity: source luminosity with backdrop hue and saturation.

Add

Additive (screen-space light). Fixed-function.

Multiply

multiply: per-channel S * D. Fixed-function.

Implementations

impl BlendMode

pub fn needs_isolation(self) -> bool

Modes implemented with fixed-function hardware blending on the mesh pipeline. Everything else isolates the mesh into a graphics layer and composites it with the backdrop-blend shader.

pub fn shader_mode(self) -> u32

Discriminant consumed by blend_layer.wgsl (mode flat varying).

Trait Implementations

impl Clone for BlendMode

fn clone(&self) -> BlendMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for BlendMode

impl Debug for BlendMode

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

Formats the value using the given formatter.

impl Default for BlendMode

fn default() -> BlendMode

Returns the “default value” for a type.

impl Eq for BlendMode

impl PartialEq for BlendMode

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BlendMode