Struct LightmapInfo 

pub struct LightmapInfo {
    pub view: TextureView,
    pub world_rect: [f32; 4],
    pub layer_clamp: u32,
    pub generation: u64,
}

The light map one frame produced, as its consumers see it.

Published in CallbackResources under the pass id and read back by SpriteBatch::set_light_source. view is a texture_2d_array<f32> of layer_clamp + 1 layers; the last layer is always cleared to (0, 0, 0, 1), the identity for the consumer’s maths, so an item that is lit by nothing can simply be pointed at it.

Fields

view: TextureView

Accumulator array texture view (Rgba8Unorm, one layer per mask bit).

world_rect: [f32; 4]

World rect the map covers: [x, y, w, h], uv origin at its top-left.

layer_clamp: u32

Highest layer an item may sample (the identity layer).

generation: u64

Bumped whenever the underlying texture is recreated. Consumers compare it to know when a cached bind group is stale; the rect changes every frame and travels in the consumer’s own uniform instead.