Struct FrontToBackBuilder

pub struct FrontToBackBuilder<K> {
    opaque_items: Vec<Item<K>>,
    alpha_items: Vec<Item<K>>,
}

A builder that applies occlusion culling with rectangles provided in front-to-back order.

Fields

opaque_items: Vec<Item<K>>

alpha_items: Vec<Item<K>>

Implementations

impl<K> FrontToBackBuilder<K>

where K: Copy,

pub fn with_capacity(opaque: usize, alpha: usize) -> Self

Pre-allocating constructor.

pub fn add(&mut self, rect: &DeviceBox2D, is_opaque: bool, key: K) -> bool

Add a rectangle, potentially splitting it and discarding the occluded parts if any.

Returns true the rectangle is at least partially visible.

pub fn test(&self, rect: &DeviceBox2D) -> bool

Returns true if the provided rect is at least partially visible, without adding it.

pub fn opaque_items(&self) -> &[Item<K>]

The visible opaque rectangles (front-to-back order).

pub fn alpha_items(&self) -> &[Item<K>]

The visible non-opaque rectangles (front-to-back order).