concinnity-engine 0.18.64

Runtime engine for Concinnity: ECS schedule, graphics, spawn, streaming
Documentation 
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// src/spawn/visibility.rs
//
// Runtime show/hide: switch a subtree's draw slots off and on without
// despawning anything. Driven by the VisibilityRequest events SpawnSystem
// drains each step. The Hidden tag records the state, and the scene-switch
// visibility snapshot skips tagged entities, so a scene jump never relights
// a hidden entity.

use crate::components::{Hidden, RenderHandle};
use crate::ecs::{Entity, PipelineContext};
use crate::gfx::ops::RenderOps;

pub(super) fn set_subtree_visibility(
    ctx: &mut PipelineContext,
    ops: &mut RenderOps,
    root: Entity,
    visible: bool,
) {
    for entity in super::despawn::collect_subtree(ctx, root) {
        if visible {
            ctx.remove::<Hidden>(entity);
        } else if ctx.get::<Hidden>(entity).is_none() {
            ctx.insert(entity, Hidden);
        }
        // Clone the slot list out so the immutable borrow ends before the
        // next entity's tag toggle.
        let slots: concinnity_memory::InlineVec<u32> = ctx
            .get::<RenderHandle>(entity)
            .map(|h| h.draws.clone())
            .unwrap_or_default();
        for slot in slots {
            ops.record(move |backend| backend.update_visibility(slot as usize, visible));
        }
    }
}