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Multi window UI #8780

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Closed

Multi window UI #8780

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ickshonpe
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@ickshonpe ickshonpe commented Jun 7, 2023 •
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Objective

Solution

A separate Taffy layout tree is created for each camera with UiCameraConfig show_ui enabled.
Root UI nodes can select which camera's render target they should be rendered to using the UiView component.

Doesn't support split screen/multiviewport UI. I've got this working but I'm not sure how sound the implementation is and this is already a very large and complicated PR.

The implementation isn't super efficient at the moment. It uses a lot of hashmaps that are regenerated every frame. Most of the issues can be easily fixed by storing these values in components on the UI node entities instead.

eaf024be-e155-4985-9cb9-82bbaf9a6c9d.0.ba411d84-2925-45ca-8c54-48177670b53d.mp4

Changelog

ui_layout_system:

  • Style and Children UI updates walk the tree for each layout instead of iterating through all UI nodes.
  • Also walks each layout tree to update the Node and Transform components after a new layout is generated.

ui_stack_system:

  • Now responsible for managing windows, scaling, and camera views for the UI, instead of 'ui_layout_system`. Decides which window or texture each UI node should be rendered to.

ui_focus_system

  • Interaction works with multiple windows and UI layouts.
  • Added UiCursorOverride resource as a method of enabling interaction for render-to-texture UI.

UiStacks

  • New resource wrapping a Vec<UiStack>.

UiStack

  • No longer a resource. Also holds view information for the stack.

UiSurface:

  • Replaced the window_nodes field with a new Resource UiViewToLayout.
  • Deleted the upsert_node, update_window, set_window_children, compute_layout and compute_window_layouts methods.

UiNodeToView:

  • New resource. Maps UI node entities to view entities.

text:

  • Looks up the scale factor in the UiLayouts resource for each UI node, instead of using the primary window's scale factor.
  • Deleted the create_text_measure and queue_text functions.

UiLayouts:

  • New resource contains a list of UiLayouts each containing the Taffy root node and context information for the UI layout corresponding to a Ui Camera.

UiScale:

  • Can be added as a component to camera entities where the UI will scale the corresponding UI layout by its value instead of applying the scaling from the global UiScale resource.

UiDefaultView

  • New resource wraps a camera entity. Root UI nodes without a UiView component will be added to the layout associated with this camera.

  • new example: multi_window_ui

Migration Guide

@ickshonpe
Changes to LayoutContext:
7940186 
* Renamed the `scale_factor` field to `combined_scale_factor` to reflect how it is the product of the target's scale factor and `UiScale`.
* Added the field `inverse_target_scale_factor`. The UI layout coordinates returned by Taffy are multiplied by this value before being written to the `Node` and `Transform` components of each UI node entity.
* Removed the `min_size` and `max_size` fields, it doesn't seem like there is much benefit from caching this.
@ickshonpe
Made changes to the layout module needed to support multi-window UI.
d4a243a 
Still needs changes to rendering, `UiStack`, and `Focus` for multi-window UI to work correctly.

`LayoutContent`:
* Derive `Copy`, `Clone`, `PartialEq` and `Debug`
* Reodered the paramters of the `new` function so that `phyiscal_size` is first to reflect it's relative importance.

`ui_layout_system`:
* For each camera with UI enabled, it creates or updates an associated Taffy root node which it gives the same size as the camera's render target.
* Calls `update_ui_layouts` to update the UI layout for each camera with UI.

`update_ui_layouts`:
* New function.
* Updates the UI layout for each `UiLayoutRoot`. Does most of what `ui_layout_system` used to do.

`UiCameraToRoot`:
* New `Resource`.
* Maps Bevy camera entities to their associated Taffy Root Nodes. Replacement for the `window_nodes` field of `UiSurface`.

`UiDefaultCamera`:
* New `Resource`.
* If a root UI node has no `UiCameraTarget` component, the root UI node's Taffy node is made a child of the Taffy root associated with `UiDefaultCamera::entity`.

`UiLayoutRoot`:
* Contains the Taffy root node and context information for the UI layout corresponding to a Ui Camera.

`UiTargetCamera`:
* New `Component`. Add to a parentless UI node to set which `Camera`'s associated UI layout the UI node and its descendants should be added to.

`UiSurface`:
* Replaced the `window_nodes` field with a new `Resource` `UiCameraToRoot` to fix borrow problems.
* Deleted the `update_window`, `set_window_children`, `compute_layout` and `compute_window_layouts` methods.

new example:
`multi_window_ui`
@ickshonpe
# changes
5340a2c 
Added `Without<UiTargetCamera>` filter to `root_uinode_query` to stop all UI nodes being added as children to the default camera's UI layout.
@ickshonpe
# changes:
ea064a7 
`ui_layout_system`:
* New `ui_layout_system` deleted, functionality transferred to `ui_stack_system`. `update_ui_layouts` renamed to `ui_layout_system`.

`ui_focus_system`:
* Temporarily disabled.

`UiStack`:
* `UiStack` is no longer a resource.
* Added `base_index` and `camera_entity` fields.

`UiStacks`:
* New resource wrapping a `Vector<UiStack>`.

`ui_stack_system`:
* All the cameras and root context code moved into here.
* Schedule changed so it runs before `ui_layout_system`.

`ExtractedUiNode`:
* Added a `camera` field.

`extract_uinodes` + `extract_text_uinodes`:
* Modified to support the multiple `UiStack`s.

`UiBatch`:
* Added a camera field.

`prepare_uinodes`:
* Create a new batch when camera is changed.

`queue_uinodes`:
* Added `Entity` to `views` query.
* Only adds items to `RenderPhase<TransparentUi>` if camera and view entities match.
@ickshonpe
Modified ui_focus_system to support multiple windows.
afdff7a
@ickshonpe
Clear all UI stacks each frame
fce6e5e
@ickshonpe
Fixed perform_full_update checks.
f1601b5
@ickshonpe
Cleaned up and applied some ci lint suggestions.
2b197f4 
Improved the `multi_window_ui` example a little with a better layout and added some colors.
@ickshonpe
UiLayoutRoot:
1e15123 
* renamed to `UiLayout`
* renamed `perform_full_update` to `needs_full_update`

`multi_window_ui` example:
* Added example of rendering UI to a texture.

`ui_layout_system`
* Separated node insertion and style updates
* Style updates walk the UI tree recursively
* Geometry updates walk the UI tree recursively
@ickshonpe
# changes
b950b07 
`UiSurface`:
* Removed `upsert_node` method.
* `update_children`'s Entity parameter replaced with a taffy node parameter.
@ickshonpe
text module:
d1aa376 
* Look up scale factor in `UiLayouts` resource for each uinode, instead of using the primary window's scale factor.
* The two hashmap look ups per entity probably slow.
* Removed `create_text_measure` and `queue_text` functions.

`extract_text_uinodes`:
* Look up scale factor in `UiLayouts` resource for each text node, instead of using the primary window's scale factor.

`UiLayout`:
* Added field `scale_factor_changed`.

`UiCameraToRoot`:
* Renamed to `UiLayouts`.

`UiNodeToCamera`:
* New resource. Hashmap mapping each uinodes to a camera.

`ui_stack_system`:
* Set `scale_factor_changed` flag on updates.
@ickshonpe
Fixed text_system conditional causing text recomputation every frame.
edd15a7
@ickshonpe
* Added doc comments for new types
817ab2c 
`ui_layout_system`:
* Tiny refactor moving the recursive update functions into the loop.
@ickshonpe
UiCursorOverride:
4df7a99 
* New resource. If set overrides any cursor position value retrieved from `Window`. Enables interaction with UI rendered to texture.

`multi_window_ui` example:
* Implemented interaction with the UI layout rendered to the sprite.
@ickshonpe
LayoutContext renamed to UiContent
920f4b9 
Changed some variable names where they were inconsistant.
@ickshonpe
UiContext:
0797880 
* Added `ui_scale` field.

`UiScale`:
* If added as a component to camera nodes, the UI will scale that layout by its value instead of using the scale from global `UiScale` resource.

`ui_stack_system`:
* Queries for `Option<&UiScale>` and if found sets the value to the `ui_scale` field of the layout's UiContext.
@ickshonpe
Edited comment.
9a4404c
@ickshonpe
Fixed broken doc comment links.
9e4b8cb
@alice-i-cecile alice-i-cecile added C-Feature A new feature, making something new possible A-Windowing Platform-agnostic interface layer to run your app in A-UI Graphical user interfaces, styles, layouts, and widgets labels Jun 7, 2023
@ickshonpe
comment edit
b755a6c
@ickshonpe
Fixed an error in comments.
42be8b9 
Renamed `UiContext` back to `LayoutContext`
@ickshonpe ickshonpe mentioned this pull request Aug 29, 2023
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@rparrett
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rparrett commented Feb 1, 2024

Looks like the objective was accomplished in #10559.

@rparrett rparrett closed this Feb 1, 2024
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