Struct AutoExposureState 

pub struct AutoExposureState {
    pub current_ev: f32,
}

Running auto-exposure state. The current adapted EV moves toward the target EV (derived from the GPU-measured average log-luminance) via an exponential moving average so a sudden brightness change ramps in over a fraction of a second rather than snapping. One instance lives on each backend that runs auto-exposure.

Fields

current_ev: f32

EV currently applied to the scene. Updated each frame by AutoExposureState::update; the backend reads it back out to set the exposure multiplier the post passes push to the GPU.

Implementations

impl AutoExposureState

pub fn new(settings: &AutoExposureSettings) -> Self

Initial state. The current EV is the midpoint of the settings’ clamp range: a neutral starting point before the first GPU measurement arrives. The first update call snaps it toward the real scene EV.

pub fn update( &mut self, avg_log_lum: f32, ev_bias: f32, settings: &AutoExposureSettings, dt: f32, ) -> f32

Step the EMA one frame: take the GPU-measured average log-luminance (base-2), turn it into a target EV (the offset that maps the scene mean onto settings.target_log_lum plus the authored ev_bias), then move current_ev toward it by the clamped EMA rate. Returns the new clamped EV. dt is the frame time in seconds; non-finite or non-positive values short-circuit (the EV stays where it was, no NaN propagation into the post pass).

Trait Implementations

impl Clone for AutoExposureState

fn clone(&self) -> AutoExposureState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for AutoExposureState

impl Debug for AutoExposureState

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

Formats the value using the given formatter.