Struct PerformancePolicy 

pub struct PerformancePolicy {
    pub target_fps: Option<f32>,
    pub min_render_scale: f32,
    pub max_render_scale: f32,
    pub allow_dynamic_resolution: bool,
    pub allow_shadow_reduction: bool,
    pub allow_volume_quality_reduction: bool,
    pub allow_effect_throttling: bool,
}

Controls what quality reductions the viewport is allowed to apply under load.

Set once via crate::ViewportRenderer::set_performance_policy. The internal adaptation controller reads target_fps and adjusts render scale within [min_render_scale, max_render_scale] when allow_dynamic_resolution is true.

Pass-specific flags (allow_shadow_reduction, allow_volume_quality_reduction, allow_effect_throttling) gate concrete quality reductions that kick in when the previous frame missed the target budget.

Fields

target_fps: Option<f32>

Target frames per second. None means uncapped; missed_budget is always false.

min_render_scale: f32

Lower bound for dynamic render scale (e.g. 0.5 = half resolution).

max_render_scale: f32

Upper bound for dynamic render scale (1.0 = native).

allow_dynamic_resolution: bool

Allow the viewport to adjust render scale automatically when budget is exceeded.

When false, the internal controller is inactive and render scale can be set manually via crate::ViewportRenderer::set_render_scale.

allow_shadow_reduction: bool

Allow the viewport to skip the shadow pass under load.

When true and the previous frame exceeded the target budget, the shadow depth pass is skipped entirely. Shadows reappear as soon as the frame is within budget.

allow_volume_quality_reduction: bool

Allow the viewport to reduce volume raymarch quality under load.

When true and the previous frame exceeded the target budget, the per-volume step size is doubled (half the number of samples), reducing GPU cost at the cost of coarser volume appearance.

allow_effect_throttling: bool

Allow the viewport to skip non-essential HDR effect passes under load.

When true and the previous frame exceeded the target budget, the SSAO, contact shadow, and bloom passes are skipped for that frame.

Trait Implementations

impl Clone for PerformancePolicy

fn clone(&self) -> PerformancePolicy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PerformancePolicy

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

Formats the value using the given formatter.

impl Default for PerformancePolicy

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for PerformancePolicy

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for PerformancePolicy

impl StructuralPartialEq for PerformancePolicy