Struct GrainParams 

pub struct GrainParams {
    pub enabled: bool,
    pub intensity: f32,
    pub size: f32,
    pub speed: f32,
    pub luma_weight: f32,
    pub color_grain: f32,
    pub softness: f32,
}

Film grain pass parameters.

Fields

enabled: bool

intensity: f32

Base grain strength (0.0 = none, 0.05 = subtle film grain, 0.15 = heavy).

size: f32

Size of each grain sample in pixels (1.0 = per-pixel, 2.0 = chunky).

speed: f32

Temporal animation speed (how fast the grain pattern changes). 1.0 = normal.

luma_weight: f32

Luma weighting: 0.0 = flat grain everywhere, 1.0 = grain only in bright areas.

color_grain: f32

Color grain mixing: 0.0 = monochrome grain, 1.0 = RGB channel-independent.

softness: f32

Soft grain vs hard grain. 0.0 = hard (high contrast), 1.0 = soft (gaussian).

Implementations

impl GrainParams

pub fn none() -> Self

No grain.

pub fn subtle() -> Self

Subtle film grain (cinematic quality).

pub fn heavy() -> Self

Heavy grain (damaged film stock aesthetic).

pub fn digital_noise() -> Self

Digital noise (hard, flat, color grain — like a low-light CMOS sensor).

pub fn chaos(entropy: f32) -> Self

Chaos distortion grain (used during high entropy events like Chaos Rift proximity).

pub fn lerp(a: &Self, b: &Self, t: f32) -> Self

Lerp between two grain settings for smooth transitions.

pub fn sample(&self, pixel: f32, seed: f32, uv_x: f32, uv_y: f32) -> f32

Simulate what this grain does to a single pixel value (CPU preview).

pixel is a linear luma value [0, 1]. seed is the current frame time (drives temporal variation). uv is the screen UV coordinate for spatial variation. Returns the additive grain value to add/subtract from the pixel.

Trait Implementations

impl Clone for GrainParams

fn clone(&self) -> GrainParams

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GrainParams

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

Formats the value using the given formatter.

impl Default for GrainParams

fn default() -> Self

Returns the “default value” for a type.