Struct ExposureController 

pub struct ExposureController {

    pub mode: ExposureMode,
    pub exposure: f32,
    pub target_exposure: f32,
    pub manual_exposure: f32,
    pub adaptation_speed_up: f32,
    pub adaptation_speed_down: f32,
    pub min_exposure: f32,
    pub max_exposure: f32,
    pub ev_compensation: f32,
    pub key_value: f32,
    pub histogram_low_percentile: f32,
    pub histogram_high_percentile: f32,
    pub histogram_bins: u32,
    pub histogram: Vec<u32>,
    pub average_luminance: f32,
    pub spot_radius: f32,
}

Controls automatic exposure adaptation.

Fields

mode: ExposureMode

Current exposure mode.

exposure: f32

Current computed exposure value.

target_exposure: f32

Target exposure (what we are adapting toward).

manual_exposure: f32

Manual exposure override (used when mode == Manual).

adaptation_speed_up: f32

Adaptation speed (how fast exposure changes, in EV/sec).

adaptation_speed_down: f32

min_exposure: f32

Minimum exposure (prevents screen from going too dark).

max_exposure: f32

Maximum exposure (prevents screen from going too bright).

ev_compensation: f32

EV compensation (artist-controlled bias).

key_value: f32

Key value for average luminance mode (typically 0.18 for 18% gray).

histogram_low_percentile: f32

Histogram low percentile to ignore (e.g., 0.1 = bottom 10%).

histogram_high_percentile: f32

Histogram high percentile to ignore (e.g., 0.9 = top 10%).

histogram_bins: u32

Number of histogram bins.

histogram: Vec<u32>

The histogram data (populated each frame).

average_luminance: f32

Average luminance computed last frame.

spot_radius: f32

Spot metering radius (fraction of screen width).

Implementations

impl ExposureController

pub fn new() -> Self

pub fn update(&mut self, dt: f32)

Update exposure for the current frame.

pub fn feed_luminance(&mut self, luminance: f32)

Feed the controller a luminance value for the current frame (computed from downsampled HDR buffer).

pub fn feed_histogram(&mut self, histogram: Vec<u32>)

Feed a histogram for the current frame.

pub fn exposure_multiplier(&self) -> f32

Get the current exposure multiplier for the tone mapping shader.

pub fn reset(&mut self)

Reset to defaults.

Trait Implementations

impl Clone for ExposureController

fn clone(&self) -> ExposureController

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExposureController

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

Formats the value using the given formatter.

impl Default for ExposureController

fn default() -> Self

Returns the “default value” for a type.