Struct VarianceShadowMap 

pub struct VarianceShadowMap {
    pub width: u32,
    pub height: u32,
    pub moment1: Vec<f32>,
    pub moment2: Vec<f32>,
    pub view_projection: Mat4,
    pub min_variance: f32,
    pub light_bleed_reduction: f32,
}

Variance shadow map for soft shadows using statistical analysis. Stores depth and depth-squared moments for Chebyshev’s inequality test.

Fields

width: u32

height: u32

moment1: Vec<f32>

First moment (mean depth).

moment2: Vec<f32>

Second moment (mean depth squared).

view_projection: Mat4

min_variance: f32

Minimum variance to prevent light bleeding.

light_bleed_reduction: f32

Light bleed reduction factor (0..1).

Implementations

impl VarianceShadowMap

pub fn new(width: u32, height: u32) -> Self

pub fn clear(&mut self)

Clear both moment buffers.

pub fn write_depth(&mut self, x: u32, y: u32, depth: f32)

Write a depth sample to the variance map (accumulates moments).

pub fn sample_moments(&self, u: f32, v: f32) -> (f32, f32)

Sample the moments at normalized UV with bilinear filtering.

pub fn shadow_factor(&self, world_pos: Vec3) -> f32

Compute the shadow factor using Chebyshev’s inequality.

pub fn blur(&mut self, radius: u32)

Apply a box blur to the moment buffers (for smoother shadows).

pub fn memory_bytes(&self) -> usize

Get memory usage in bytes.

Trait Implementations

impl Clone for VarianceShadowMap

fn clone(&self) -> VarianceShadowMap

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for VarianceShadowMap

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

Formats the value using the given formatter.