From 76ec709edee77c28a4a027ff1ab8d768be523633 Mon Sep 17 00:00:00 2001
From: davier <bricedavier@gmail.com>
Date: Fri, 24 Dec 2021 07:10:12 +0000
Subject: [PATCH] Add Visibility component to UI (#3426)

# Objective

Fixes #3422

## Solution

Adds the existing `Visibility` component to UI bundles and checks for it in the extract phase of the render app.

The `ComputedVisibility` component was not added. I don't think the UI camera needs frustum culling, but having `RenderLayers` work may be desirable. However I think we would need to change `check_visibility()` to differentiate between 2d, 3d and UI entities.
---
 crates/bevy_render/src/view/visibility/mod.rs |  2 +-
 crates/bevy_ui/src/entity.rs                  |  8 +++++++-
 crates/bevy_ui/src/render/mod.rs              | 14 +++++++++++---
 3 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/crates/bevy_render/src/view/visibility/mod.rs b/crates/bevy_render/src/view/visibility/mod.rs
index 50924d06ae..d38e45231b 100644
--- a/crates/bevy_render/src/view/visibility/mod.rs
+++ b/crates/bevy_render/src/view/visibility/mod.rs
@@ -15,7 +15,7 @@ use crate::{
 };
 
 /// User indication of whether an entity is visible
-#[derive(Component, Clone, Reflect)]
+#[derive(Component, Clone, Reflect, Debug)]
 #[reflect(Component)]
 pub struct Visibility {
     pub is_visible: bool,
diff --git a/crates/bevy_ui/src/entity.rs b/crates/bevy_ui/src/entity.rs
index da8c307167..a65d594506 100644
--- a/crates/bevy_ui/src/entity.rs
+++ b/crates/bevy_ui/src/entity.rs
@@ -5,7 +5,7 @@ use crate::{
 use bevy_ecs::bundle::Bundle;
 use bevy_render::{
     camera::{Camera, DepthCalculation, OrthographicProjection, WindowOrigin},
-    view::VisibleEntities,
+    view::{Visibility, VisibleEntities},
 };
 use bevy_text::Text;
 use bevy_transform::prelude::{GlobalTransform, Transform};
@@ -18,6 +18,7 @@ pub struct NodeBundle {
     pub image: UiImage,
     pub transform: Transform,
     pub global_transform: GlobalTransform,
+    pub visibility: Visibility,
 }
 
 #[derive(Bundle, Clone, Debug, Default)]
@@ -30,6 +31,7 @@ pub struct ImageBundle {
     pub image: UiImage,
     pub transform: Transform,
     pub global_transform: GlobalTransform,
+    pub visibility: Visibility,
 }
 
 #[derive(Bundle, Clone, Debug)]
@@ -41,6 +43,7 @@ pub struct TextBundle {
     pub focus_policy: FocusPolicy,
     pub transform: Transform,
     pub global_transform: GlobalTransform,
+    pub visibility: Visibility,
 }
 
 impl Default for TextBundle {
@@ -53,6 +56,7 @@ impl Default for TextBundle {
             style: Default::default(),
             transform: Default::default(),
             global_transform: Default::default(),
+            visibility: Default::default(),
         }
     }
 }
@@ -68,6 +72,7 @@ pub struct ButtonBundle {
     pub image: UiImage,
     pub transform: Transform,
     pub global_transform: GlobalTransform,
+    pub visibility: Visibility,
 }
 
 impl Default for ButtonBundle {
@@ -82,6 +87,7 @@ impl Default for ButtonBundle {
             image: Default::default(),
             transform: Default::default(),
             global_transform: Default::default(),
+            visibility: Default::default(),
         }
     }
 }
diff --git a/crates/bevy_ui/src/render/mod.rs b/crates/bevy_ui/src/render/mod.rs
index 5750becce9..46fe825a12 100644
--- a/crates/bevy_ui/src/render/mod.rs
+++ b/crates/bevy_ui/src/render/mod.rs
@@ -23,7 +23,7 @@ use bevy_render::{
     render_resource::*,
     renderer::{RenderDevice, RenderQueue},
     texture::Image,
-    view::ViewUniforms,
+    view::{ViewUniforms, Visibility},
     RenderApp, RenderStage, RenderWorld,
 };
 use bevy_sprite::{Rect, SpriteAssetEvents, TextureAtlas};
@@ -139,12 +139,16 @@ pub fn extract_uinodes(
         &GlobalTransform,
         &UiColor,
         &UiImage,
+        &Visibility,
         Option<&CalculatedClip>,
     )>,
 ) {
     let mut extracted_uinodes = render_world.get_resource_mut::<ExtractedUiNodes>().unwrap();
     extracted_uinodes.uinodes.clear();
-    for (uinode, transform, color, image, clip) in uinode_query.iter() {
+    for (uinode, transform, color, image, visibility, clip) in uinode_query.iter() {
+        if !visibility.is_visible {
+            continue;
+        }
         let image = image.0.clone_weak();
         // Skip loading images
         if !images.contains(image.clone_weak()) {
@@ -174,6 +178,7 @@ pub fn extract_text_uinodes(
         &Node,
         &GlobalTransform,
         &Text,
+        &Visibility,
         Option<&CalculatedClip>,
     )>,
 ) {
@@ -185,7 +190,10 @@ pub fn extract_text_uinodes(
         1.
     };
 
-    for (entity, uinode, transform, text, clip) in uinode_query.iter() {
+    for (entity, uinode, transform, text, visibility, clip) in uinode_query.iter() {
+        if !visibility.is_visible {
+            continue;
+        }
         // Skip if size is set to zero (e.g. when a parent is set to `Display::None`)
         if uinode.size == Vec2::ZERO {
             continue;