bevy_fast_light 0.8.0

Simple 2D lighting for Bevy focused on performance over features.
Documentation 
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/*
 * Heavily inspired by:
 * - https://github.com/malbernaz/bevy_lit
 */

//! Preparation [`RenderSystems`](bevy::render::RenderSystems).

use bevy::{
    ecs::{
        resource::Resource,
        system::{Query, Res, ResMut},
    },
    platform::collections::HashMap,
    render::{
        renderer::RenderDevice,
        texture::{CachedTexture, TextureCache},
        view::{ExtractedView, RetainedViewEntity, ViewTarget},
    },
};

use crate::{plugin::prelude::*, utils::prelude::*};

/// [`CachedTexture`]s for [`MeshOccluder2d`](crate::prelude::MeshOccluder2d).
#[derive(Resource, Default)]
pub(crate) struct OccluderTextures(pub(crate) HashMap<RetainedViewEntity, CachedTexture>);

/// Prepare scaled [`CachedTexture`]s and insert into [`OccluderTextures`].
pub(super) fn prepare_occluder_texture(
    views: Query<(&ViewTarget, &ExtractedView)>,
    mut textures: ResMut<OccluderTextures>,
    mut texture_cache: ResMut<TextureCache>,
    render_device: Res<RenderDevice>,
    settings: Res<FastLightSettings>,
) {
    for (view_target, extracted_view) in views {
        let texture = cached_scaled_2d_texture(
            &mut texture_cache,
            &render_device,
            &settings,
            view_target,
            "occluder_texture",
        );

        textures
            .0
            .insert(extracted_view.retained_view_entity, texture);
    }
}