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https://github.com/bevyengine/bevy
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Impose a more sensible ordering for animation graph evaluation. (#15589)
This is an updated version of #15530. Review comments were addressed. This commit changes the animation graph evaluation to be operate in a more sensible order and updates the semantics of blend nodes to conform to [the animation composition RFC]. Prior to this patch, a node graph like this: ``` ┌─────┐ │ │ │ 1 │ │ │ └──┬──┘ │ ┌───────┴───────┐ │ │ ▼ ▼ ┌─────┐ ┌─────┐ │ │ │ │ │ 2 │ │ 3 │ │ │ │ │ └──┬──┘ └──┬──┘ │ │ ┌───┴───┐ ┌───┴───┐ │ │ │ │ ▼ ▼ ▼ ▼ ┌─────┐ ┌─────┐ ┌─────┐ ┌─────┐ │ │ │ │ │ │ │ │ │ 4 │ │ 6 │ │ 5 │ │ 7 │ │ │ │ │ │ │ │ │ └─────┘ └─────┘ └─────┘ └─────┘ ``` Would be evaluated as (((4 ⊕ 5) ⊕ 6) ⊕ 7), with the blend (lerp/slerp) operation notated as ⊕. As quaternion multiplication isn't commutative, this is very counterintuitive and will especially lead to trouble with the forthcoming additive blending feature (#15198). This patch fixes the issue by changing the evaluation order to postorder, with children of a node evaluated in ascending order by node index. To do so, this patch revamps `AnimationCurve` to be based on an *evaluation stack* and a *blend register*. During target evaluation, the graph evaluator traverses the graph in postorder. When encountering a clip node, the evaluator pushes the possibly-interpolated value onto the evaluation stack. When encountering a blend node, the evaluator pops values off the stack into the blend register, accumulating weights as appropriate. When the graph is completely evaluated, the top element on the stack is *committed* to the property of the component. A new system, the *graph threading* system, is added in order to cache the sorted postorder traversal to avoid the overhead of sorting children at animation evaluation time. Mask evaluation has been moved to this system so that the graph only has to be traversed at most once per frame. Unlike the `ActiveAnimation` list, the *threaded graph* is cached from frame to frame and only has to be regenerated when the animation graph asset changes. This patch currently regresses the `animate_target` performance in `many_foxes` by around 50%, resulting in an FPS loss of about 2-3 FPS. I'd argue that this is an acceptable price to pay for a much more intuitive system. In the future, we can mitigate the regression with a fast path that avoids consulting the graph if only one animation is playing. However, in the interest of keeping this patch simple, I didn't do so here. [the animation composition RFC]: https://github.com/bevyengine/rfcs/blob/main/rfcs/51-animation-composition.md # Objective - Describe the objective or issue this PR addresses. - If you're fixing a specific issue, say "Fixes #X". ## Solution - Describe the solution used to achieve the objective above. ## Testing - Did you test these changes? If so, how? - Are there any parts that need more testing? - How can other people (reviewers) test your changes? Is there anything specific they need to know? - If relevant, what platforms did you test these changes on, and are there any important ones you can't test? --- ## Showcase > This section is optional. If this PR does not include a visual change or does not add a new feature, you can delete this section. - Help others understand the result of this PR by showcasing your awesome work! - If this PR adds a new feature or public API, consider adding a brief pseudo-code snippet of it in action - If this PR includes a visual change, consider adding a screenshot, GIF, or video - If you want, you could even include a before/after comparison! - If the Migration Guide adequately covers the changes, you can delete this section While a showcase should aim to be brief and digestible, you can use a toggleable section to save space on longer showcases: <details> <summary>Click to view showcase</summary> ```rust println!("My super cool code."); ``` </details> ## Migration Guide > This section is optional. If there are no breaking changes, you can delete this section. - If this PR is a breaking change (relative to the last release of Bevy), describe how a user might need to migrate their code to support these changes - Simply adding new functionality is not a breaking change. - Fixing behavior that was definitely a bug, rather than a questionable design choice is not a breaking change. --------- Co-authored-by: Alice Cecile <alice.i.cecile@gmail.com>
This commit is contained in:
Patrick Walton
GitHub
parent
67744bb011
commit
ca8dd06146
5 changed files with 1029 additions and 201 deletions
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@ -33,7 +33,6 @@ bevy_ui = { path = "../bevy_ui", version = "0.15.0-dev", features = [
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bevy_text = { path = "../bevy_text", version = "0.15.0-dev" }
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# other
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fixedbitset = "0.5"
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petgraph = { version = "0.6", features = ["serde-1"] }
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ron = "0.8"
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serde = "1"
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@ -41,6 +40,7 @@ blake3 = { version = "1.0" }
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thiserror = "1"
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thread_local = "1"
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uuid = { version = "1.7", features = ["v4"] }
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smallvec = "1"
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[lints]
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workspace = true
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@ -89,13 +89,15 @@ use bevy_math::{
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iterable::IterableCurve,
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Curve, Interval,
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},
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FloatExt, Quat, Vec3,
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Quat, Vec3,
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};
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use bevy_reflect::{FromReflect, Reflect, Reflectable, TypePath};
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use bevy_render::mesh::morph::MorphWeights;
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use bevy_transform::prelude::Transform;
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use crate::{prelude::Animatable, AnimationEntityMut, AnimationEvaluationError};
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use crate::{
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graph::AnimationNodeIndex, prelude::Animatable, AnimationEntityMut, AnimationEvaluationError,
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};
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/// A value on a component that Bevy can animate.
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///
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@ -188,6 +190,21 @@ pub struct AnimatableCurve<P, C> {
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_phantom: PhantomData<P>,
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}
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/// An [`AnimatableCurveEvaluator`] for [`AnimatableProperty`] instances.
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///
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/// You shouldn't ordinarily need to instantiate one of these manually. Bevy
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/// will automatically do so when you use an [`AnimatableCurve`] instance.
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#[derive(Reflect, FromReflect)]
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#[reflect(from_reflect = false)]
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pub struct AnimatableCurveEvaluator<P>
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where
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P: AnimatableProperty,
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{
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evaluator: BasicAnimationCurveEvaluator<P::Property>,
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#[reflect(ignore)]
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phantom: PhantomData<P>,
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}
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impl<P, C> AnimatableCurve<P, C>
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where
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P: AnimatableProperty,
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@ -241,20 +258,72 @@ where
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self.curve.domain()
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}
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fn apply<'a>(
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fn evaluator_type(&self) -> TypeId {
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TypeId::of::<AnimatableCurveEvaluator<P>>()
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}
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fn create_evaluator(&self) -> Box<dyn AnimationCurveEvaluator> {
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Box::new(AnimatableCurveEvaluator {
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evaluator: BasicAnimationCurveEvaluator::default(),
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phantom: PhantomData::<P>,
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})
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}
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fn apply(
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&self,
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curve_evaluator: &mut dyn AnimationCurveEvaluator,
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t: f32,
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_transform: Option<Mut<'a, Transform>>,
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mut entity: AnimationEntityMut<'a>,
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weight: f32,
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graph_node: AnimationNodeIndex,
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) -> Result<(), AnimationEvaluationError> {
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let curve_evaluator = (*Reflect::as_any_mut(curve_evaluator))
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.downcast_mut::<AnimatableCurveEvaluator<P>>()
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.unwrap();
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let value = self.curve.sample_clamped(t);
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curve_evaluator
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.evaluator
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.stack
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.push(BasicAnimationCurveEvaluatorStackElement {
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value,
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weight,
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graph_node,
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});
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Ok(())
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}
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}
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impl<P> AnimationCurveEvaluator for AnimatableCurveEvaluator<P>
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where
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P: AnimatableProperty,
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{
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fn blend(&mut self, graph_node: AnimationNodeIndex) -> Result<(), AnimationEvaluationError> {
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self.evaluator.blend(graph_node)
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}
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fn push_blend_register(
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&mut self,
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weight: f32,
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graph_node: AnimationNodeIndex,
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) -> Result<(), AnimationEvaluationError> {
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self.evaluator.push_blend_register(weight, graph_node)
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}
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fn commit<'a>(
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&mut self,
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_: Option<Mut<'a, Transform>>,
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mut entity: AnimationEntityMut<'a>,
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) -> Result<(), AnimationEvaluationError> {
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let mut component = entity.get_mut::<P::Component>().ok_or_else(|| {
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AnimationEvaluationError::ComponentNotPresent(TypeId::of::<P::Component>())
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})?;
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let property = P::get_mut(&mut component)
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.ok_or_else(|| AnimationEvaluationError::PropertyNotPresent(TypeId::of::<P>()))?;
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let value = self.curve.sample_clamped(t);
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*property = <P::Property>::interpolate(property, &value, weight);
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*property = self
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.evaluator
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.stack
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.pop()
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.ok_or_else(inconsistent::<AnimatableCurveEvaluator<P>>)?
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.value;
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Ok(())
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}
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}
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@ -267,6 +336,16 @@ where
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#[reflect(from_reflect = false)]
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pub struct TranslationCurve<C>(pub C);
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/// An [`AnimationCurveEvaluator`] for use with [`TranslationCurve`]s.
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///
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/// You shouldn't need to instantiate this manually; Bevy will automatically do
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/// so.
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#[derive(Reflect, FromReflect)]
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#[reflect(from_reflect = false)]
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pub struct TranslationCurveEvaluator {
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evaluator: BasicAnimationCurveEvaluator<Vec3>,
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}
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impl<C> AnimationCurve for TranslationCurve<C>
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where
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C: AnimationCompatibleCurve<Vec3>,
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@ -279,19 +358,66 @@ where
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self.0.domain()
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}
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fn apply<'a>(
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fn evaluator_type(&self) -> TypeId {
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TypeId::of::<TranslationCurveEvaluator>()
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}
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fn create_evaluator(&self) -> Box<dyn AnimationCurveEvaluator> {
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Box::new(TranslationCurveEvaluator {
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evaluator: BasicAnimationCurveEvaluator::default(),
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})
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}
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fn apply(
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&self,
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curve_evaluator: &mut dyn AnimationCurveEvaluator,
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t: f32,
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transform: Option<Mut<'a, Transform>>,
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_entity: AnimationEntityMut<'a>,
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weight: f32,
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graph_node: AnimationNodeIndex,
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) -> Result<(), AnimationEvaluationError> {
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let curve_evaluator = (*Reflect::as_any_mut(curve_evaluator))
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.downcast_mut::<TranslationCurveEvaluator>()
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.unwrap();
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let value = self.0.sample_clamped(t);
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curve_evaluator
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.evaluator
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.stack
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.push(BasicAnimationCurveEvaluatorStackElement {
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value,
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weight,
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graph_node,
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});
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Ok(())
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}
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}
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impl AnimationCurveEvaluator for TranslationCurveEvaluator {
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fn blend(&mut self, graph_node: AnimationNodeIndex) -> Result<(), AnimationEvaluationError> {
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self.evaluator.blend(graph_node)
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}
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fn push_blend_register(
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&mut self,
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weight: f32,
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graph_node: AnimationNodeIndex,
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) -> Result<(), AnimationEvaluationError> {
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self.evaluator.push_blend_register(weight, graph_node)
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}
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fn commit<'a>(
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&mut self,
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transform: Option<Mut<'a, Transform>>,
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_: AnimationEntityMut<'a>,
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) -> Result<(), AnimationEvaluationError> {
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let mut component = transform.ok_or_else(|| {
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AnimationEvaluationError::ComponentNotPresent(TypeId::of::<Transform>())
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})?;
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let new_value = self.0.sample_clamped(t);
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component.translation =
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<Vec3 as Animatable>::interpolate(&component.translation, &new_value, weight);
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component.translation = self
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.evaluator
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.stack
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.pop()
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.ok_or_else(inconsistent::<TranslationCurveEvaluator>)?
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.value;
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Ok(())
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}
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}
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@ -304,6 +430,16 @@ where
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#[reflect(from_reflect = false)]
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pub struct RotationCurve<C>(pub C);
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/// An [`AnimationCurveEvaluator`] for use with [`RotationCurve`]s.
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///
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/// You shouldn't need to instantiate this manually; Bevy will automatically do
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/// so.
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#[derive(Reflect, FromReflect)]
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#[reflect(from_reflect = false)]
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pub struct RotationCurveEvaluator {
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evaluator: BasicAnimationCurveEvaluator<Quat>,
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}
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impl<C> AnimationCurve for RotationCurve<C>
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where
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C: AnimationCompatibleCurve<Quat>,
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@ -316,19 +452,66 @@ where
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self.0.domain()
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}
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fn apply<'a>(
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fn evaluator_type(&self) -> TypeId {
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TypeId::of::<RotationCurveEvaluator>()
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}
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fn create_evaluator(&self) -> Box<dyn AnimationCurveEvaluator> {
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Box::new(RotationCurveEvaluator {
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evaluator: BasicAnimationCurveEvaluator::default(),
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})
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}
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fn apply(
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&self,
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curve_evaluator: &mut dyn AnimationCurveEvaluator,
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t: f32,
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transform: Option<Mut<'a, Transform>>,
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_entity: AnimationEntityMut<'a>,
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weight: f32,
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graph_node: AnimationNodeIndex,
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) -> Result<(), AnimationEvaluationError> {
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let curve_evaluator = (*Reflect::as_any_mut(curve_evaluator))
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.downcast_mut::<RotationCurveEvaluator>()
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.unwrap();
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let value = self.0.sample_clamped(t);
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curve_evaluator
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.evaluator
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.stack
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.push(BasicAnimationCurveEvaluatorStackElement {
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value,
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weight,
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graph_node,
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});
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Ok(())
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}
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}
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impl AnimationCurveEvaluator for RotationCurveEvaluator {
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fn blend(&mut self, graph_node: AnimationNodeIndex) -> Result<(), AnimationEvaluationError> {
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self.evaluator.blend(graph_node)
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}
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fn push_blend_register(
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&mut self,
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weight: f32,
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graph_node: AnimationNodeIndex,
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) -> Result<(), AnimationEvaluationError> {
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self.evaluator.push_blend_register(weight, graph_node)
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}
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fn commit<'a>(
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&mut self,
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transform: Option<Mut<'a, Transform>>,
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_: AnimationEntityMut<'a>,
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) -> Result<(), AnimationEvaluationError> {
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let mut component = transform.ok_or_else(|| {
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AnimationEvaluationError::ComponentNotPresent(TypeId::of::<Transform>())
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})?;
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let new_value = self.0.sample_clamped(t);
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component.rotation =
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<Quat as Animatable>::interpolate(&component.rotation, &new_value, weight);
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component.rotation = self
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.evaluator
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.stack
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.pop()
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.ok_or_else(inconsistent::<RotationCurveEvaluator>)?
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.value;
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Ok(())
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}
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}
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@ -341,6 +524,16 @@ where
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#[reflect(from_reflect = false)]
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pub struct ScaleCurve<C>(pub C);
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/// An [`AnimationCurveEvaluator`] for use with [`ScaleCurve`]s.
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///
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/// You shouldn't need to instantiate this manually; Bevy will automatically do
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/// so.
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#[derive(Reflect, FromReflect)]
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#[reflect(from_reflect = false)]
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pub struct ScaleCurveEvaluator {
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evaluator: BasicAnimationCurveEvaluator<Vec3>,
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}
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impl<C> AnimationCurve for ScaleCurve<C>
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where
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C: AnimationCompatibleCurve<Vec3>,
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@ -353,18 +546,66 @@ where
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self.0.domain()
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}
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fn apply<'a>(
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fn evaluator_type(&self) -> TypeId {
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TypeId::of::<ScaleCurveEvaluator>()
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}
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fn create_evaluator(&self) -> Box<dyn AnimationCurveEvaluator> {
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Box::new(ScaleCurveEvaluator {
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evaluator: BasicAnimationCurveEvaluator::default(),
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})
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}
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fn apply(
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&self,
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curve_evaluator: &mut dyn AnimationCurveEvaluator,
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t: f32,
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transform: Option<Mut<'a, Transform>>,
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_entity: AnimationEntityMut<'a>,
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weight: f32,
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graph_node: AnimationNodeIndex,
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) -> Result<(), AnimationEvaluationError> {
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let curve_evaluator = (*Reflect::as_any_mut(curve_evaluator))
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.downcast_mut::<ScaleCurveEvaluator>()
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.unwrap();
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let value = self.0.sample_clamped(t);
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curve_evaluator
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.evaluator
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.stack
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.push(BasicAnimationCurveEvaluatorStackElement {
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value,
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weight,
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graph_node,
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});
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Ok(())
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}
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}
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impl AnimationCurveEvaluator for ScaleCurveEvaluator {
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fn blend(&mut self, graph_node: AnimationNodeIndex) -> Result<(), AnimationEvaluationError> {
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self.evaluator.blend(graph_node)
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}
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fn push_blend_register(
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&mut self,
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weight: f32,
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graph_node: AnimationNodeIndex,
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) -> Result<(), AnimationEvaluationError> {
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self.evaluator.push_blend_register(weight, graph_node)
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}
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fn commit<'a>(
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&mut self,
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transform: Option<Mut<'a, Transform>>,
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_: AnimationEntityMut<'a>,
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) -> Result<(), AnimationEvaluationError> {
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let mut component = transform.ok_or_else(|| {
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AnimationEvaluationError::ComponentNotPresent(TypeId::of::<Transform>())
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})?;
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let new_value = self.0.sample_clamped(t);
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component.scale = <Vec3 as Animatable>::interpolate(&component.scale, &new_value, weight);
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component.scale = self
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.evaluator
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.stack
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.pop()
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.ok_or_else(inconsistent::<ScaleCurveEvaluator>)?
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.value;
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Ok(())
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}
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}
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@ -377,6 +618,43 @@ where
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#[reflect(from_reflect = false)]
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pub struct WeightsCurve<C>(pub C);
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|
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#[derive(Reflect, FromReflect)]
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#[reflect(from_reflect = false)]
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struct WeightsCurveEvaluator {
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/// The values of the stack, in which each element is a list of morph target
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/// weights.
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///
|
||||
/// The stack elements are concatenated and tightly packed together.
|
||||
///
|
||||
/// The number of elements in this stack will always be a multiple of
|
||||
/// [`Self::morph_target_count`].
|
||||
stack_morph_target_weights: Vec<f32>,
|
||||
|
||||
/// The blend weights and graph node indices for each element of the stack.
|
||||
///
|
||||
/// This should have as many elements as there are stack nodes. In other
|
||||
/// words, `Self::stack_morph_target_weights.len() *
|
||||
/// Self::morph_target_counts as usize ==
|
||||
/// Self::stack_blend_weights_and_graph_nodes`.
|
||||
stack_blend_weights_and_graph_nodes: Vec<(f32, AnimationNodeIndex)>,
|
||||
|
||||
/// The morph target weights in the blend register, if any.
|
||||
///
|
||||
/// This field should be ignored if [`Self::blend_register_blend_weight`] is
|
||||
/// `None`. If non-empty, it will always have [`Self::morph_target_count`]
|
||||
/// elements in it.
|
||||
blend_register_morph_target_weights: Vec<f32>,
|
||||
|
||||
/// The weight in the blend register.
|
||||
///
|
||||
/// This will be `None` if the blend register is empty. In that case,
|
||||
/// [`Self::blend_register_morph_target_weights`] will be empty.
|
||||
blend_register_blend_weight: Option<f32>,
|
||||
|
||||
/// The number of morph targets that are to be animated.
|
||||
morph_target_count: Option<u32>,
|
||||
}
|
||||
|
||||
impl<C> AnimationCurve for WeightsCurve<C>
|
||||
where
|
||||
C: IterableCurve<f32> + Debug + Clone + Reflectable,
|
||||
|
|
@ -389,45 +667,222 @@ where
|
|||
self.0.domain()
|
||||
}
|
||||
|
||||
fn apply<'a>(
|
||||
fn evaluator_type(&self) -> TypeId {
|
||||
TypeId::of::<WeightsCurveEvaluator>()
|
||||
}
|
||||
|
||||
fn create_evaluator(&self) -> Box<dyn AnimationCurveEvaluator> {
|
||||
Box::new(WeightsCurveEvaluator {
|
||||
stack_morph_target_weights: vec![],
|
||||
stack_blend_weights_and_graph_nodes: vec![],
|
||||
blend_register_morph_target_weights: vec![],
|
||||
blend_register_blend_weight: None,
|
||||
morph_target_count: None,
|
||||
})
|
||||
}
|
||||
|
||||
fn apply(
|
||||
&self,
|
||||
curve_evaluator: &mut dyn AnimationCurveEvaluator,
|
||||
t: f32,
|
||||
_transform: Option<Mut<'a, Transform>>,
|
||||
mut entity: AnimationEntityMut<'a>,
|
||||
weight: f32,
|
||||
graph_node: AnimationNodeIndex,
|
||||
) -> Result<(), AnimationEvaluationError> {
|
||||
let mut dest = entity.get_mut::<MorphWeights>().ok_or_else(|| {
|
||||
AnimationEvaluationError::ComponentNotPresent(TypeId::of::<MorphWeights>())
|
||||
})?;
|
||||
lerp_morph_weights(dest.weights_mut(), self.0.sample_iter_clamped(t), weight);
|
||||
let curve_evaluator = (*Reflect::as_any_mut(curve_evaluator))
|
||||
.downcast_mut::<WeightsCurveEvaluator>()
|
||||
.unwrap();
|
||||
|
||||
let prev_morph_target_weights_len = curve_evaluator.stack_morph_target_weights.len();
|
||||
curve_evaluator
|
||||
.stack_morph_target_weights
|
||||
.extend(self.0.sample_iter_clamped(t));
|
||||
curve_evaluator.morph_target_count = Some(
|
||||
(curve_evaluator.stack_morph_target_weights.len() - prev_morph_target_weights_len)
|
||||
as u32,
|
||||
);
|
||||
|
||||
curve_evaluator
|
||||
.stack_blend_weights_and_graph_nodes
|
||||
.push((weight, graph_node));
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// Update `morph_weights` based on weights in `incoming_weights` with a linear interpolation
|
||||
/// on `lerp_weight`.
|
||||
fn lerp_morph_weights(
|
||||
morph_weights: &mut [f32],
|
||||
incoming_weights: impl Iterator<Item = f32>,
|
||||
lerp_weight: f32,
|
||||
) {
|
||||
let zipped = morph_weights.iter_mut().zip(incoming_weights);
|
||||
for (morph_weight, incoming_weights) in zipped {
|
||||
*morph_weight = morph_weight.lerp(incoming_weights, lerp_weight);
|
||||
impl AnimationCurveEvaluator for WeightsCurveEvaluator {
|
||||
fn blend(&mut self, graph_node: AnimationNodeIndex) -> Result<(), AnimationEvaluationError> {
|
||||
let Some(&(_, top_graph_node)) = self.stack_blend_weights_and_graph_nodes.last() else {
|
||||
return Ok(());
|
||||
};
|
||||
if top_graph_node != graph_node {
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
let (weight_to_blend, _) = self.stack_blend_weights_and_graph_nodes.pop().unwrap();
|
||||
let stack_iter = self.stack_morph_target_weights.drain(
|
||||
(self.stack_morph_target_weights.len() - self.morph_target_count.unwrap() as usize)..,
|
||||
);
|
||||
|
||||
match self.blend_register_blend_weight {
|
||||
None => {
|
||||
self.blend_register_blend_weight = Some(weight_to_blend);
|
||||
self.blend_register_morph_target_weights.clear();
|
||||
self.blend_register_morph_target_weights.extend(stack_iter);
|
||||
}
|
||||
|
||||
Some(ref mut current_weight) => {
|
||||
*current_weight += weight_to_blend;
|
||||
for (dest, src) in self
|
||||
.blend_register_morph_target_weights
|
||||
.iter_mut()
|
||||
.zip(stack_iter)
|
||||
{
|
||||
*dest = f32::interpolate(dest, &src, weight_to_blend / *current_weight);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn push_blend_register(
|
||||
&mut self,
|
||||
weight: f32,
|
||||
graph_node: AnimationNodeIndex,
|
||||
) -> Result<(), AnimationEvaluationError> {
|
||||
if self.blend_register_blend_weight.take().is_some() {
|
||||
self.stack_morph_target_weights
|
||||
.append(&mut self.blend_register_morph_target_weights);
|
||||
self.stack_blend_weights_and_graph_nodes
|
||||
.push((weight, graph_node));
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn commit<'a>(
|
||||
&mut self,
|
||||
_: Option<Mut<'a, Transform>>,
|
||||
mut entity: AnimationEntityMut<'a>,
|
||||
) -> Result<(), AnimationEvaluationError> {
|
||||
if self.stack_morph_target_weights.is_empty() {
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
// Compute the index of the first morph target in the last element of
|
||||
// the stack.
|
||||
let index_of_first_morph_target =
|
||||
self.stack_morph_target_weights.len() - self.morph_target_count.unwrap() as usize;
|
||||
|
||||
for (dest, src) in entity
|
||||
.get_mut::<MorphWeights>()
|
||||
.ok_or_else(|| {
|
||||
AnimationEvaluationError::ComponentNotPresent(TypeId::of::<MorphWeights>())
|
||||
})?
|
||||
.weights_mut()
|
||||
.iter_mut()
|
||||
.zip(self.stack_morph_target_weights[index_of_first_morph_target..].iter())
|
||||
{
|
||||
*dest = *src;
|
||||
}
|
||||
self.stack_morph_target_weights.clear();
|
||||
self.stack_blend_weights_and_graph_nodes.clear();
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// A low-level trait that provides control over how curves are actually applied to entities
|
||||
/// by the animation system.
|
||||
#[derive(Reflect, FromReflect)]
|
||||
#[reflect(from_reflect = false)]
|
||||
struct BasicAnimationCurveEvaluator<A>
|
||||
where
|
||||
A: Animatable,
|
||||
{
|
||||
stack: Vec<BasicAnimationCurveEvaluatorStackElement<A>>,
|
||||
blend_register: Option<(A, f32)>,
|
||||
}
|
||||
|
||||
#[derive(Reflect, FromReflect)]
|
||||
#[reflect(from_reflect = false)]
|
||||
struct BasicAnimationCurveEvaluatorStackElement<A>
|
||||
where
|
||||
A: Animatable,
|
||||
{
|
||||
value: A,
|
||||
weight: f32,
|
||||
graph_node: AnimationNodeIndex,
|
||||
}
|
||||
|
||||
impl<A> Default for BasicAnimationCurveEvaluator<A>
|
||||
where
|
||||
A: Animatable,
|
||||
{
|
||||
fn default() -> Self {
|
||||
BasicAnimationCurveEvaluator {
|
||||
stack: vec![],
|
||||
blend_register: None,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<A> BasicAnimationCurveEvaluator<A>
|
||||
where
|
||||
A: Animatable,
|
||||
{
|
||||
fn blend(&mut self, graph_node: AnimationNodeIndex) -> Result<(), AnimationEvaluationError> {
|
||||
let Some(top) = self.stack.last() else {
|
||||
return Ok(());
|
||||
};
|
||||
if top.graph_node != graph_node {
|
||||
return Ok(());
|
||||
}
|
||||
|
||||
let BasicAnimationCurveEvaluatorStackElement {
|
||||
value: value_to_blend,
|
||||
weight: weight_to_blend,
|
||||
graph_node: _,
|
||||
} = self.stack.pop().unwrap();
|
||||
|
||||
match self.blend_register {
|
||||
None => self.blend_register = Some((value_to_blend, weight_to_blend)),
|
||||
Some((ref mut current_value, ref mut current_weight)) => {
|
||||
*current_weight += weight_to_blend;
|
||||
*current_value = A::interpolate(
|
||||
current_value,
|
||||
&value_to_blend,
|
||||
weight_to_blend / *current_weight,
|
||||
);
|
||||
}
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn push_blend_register(
|
||||
&mut self,
|
||||
weight: f32,
|
||||
graph_node: AnimationNodeIndex,
|
||||
) -> Result<(), AnimationEvaluationError> {
|
||||
if let Some((value, _)) = self.blend_register.take() {
|
||||
self.stack.push(BasicAnimationCurveEvaluatorStackElement {
|
||||
value,
|
||||
weight,
|
||||
graph_node,
|
||||
});
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
/// A low-level trait that provides control over how curves are actually applied
|
||||
/// to entities by the animation system.
|
||||
///
|
||||
/// Typically, this will not need to be implemented manually, since it is automatically
|
||||
/// implemented by [`AnimatableCurve`] and other curves used by the animation system
|
||||
/// (e.g. those that animate parts of transforms or morph weights). However, this can be
|
||||
/// implemented manually when `AnimatableCurve` is not sufficiently expressive.
|
||||
/// Typically, this will not need to be implemented manually, since it is
|
||||
/// automatically implemented by [`AnimatableCurve`] and other curves used by
|
||||
/// the animation system (e.g. those that animate parts of transforms or morph
|
||||
/// weights). However, this can be implemented manually when `AnimatableCurve`
|
||||
/// is not sufficiently expressive.
|
||||
///
|
||||
/// In many respects, this behaves like a type-erased form of [`Curve`], where the output
|
||||
/// type of the curve is remembered only in the components that are mutated in the
|
||||
/// implementation of [`apply`].
|
||||
/// In many respects, this behaves like a type-erased form of [`Curve`], where
|
||||
/// the output type of the curve is remembered only in the components that are
|
||||
/// mutated in the implementation of [`apply`].
|
||||
///
|
||||
/// [`apply`]: AnimationCurve::apply
|
||||
pub trait AnimationCurve: Reflect + Debug + Send + Sync {
|
||||
|
|
@ -437,15 +892,111 @@ pub trait AnimationCurve: Reflect + Debug + Send + Sync {
|
|||
/// The range of times for which this animation is defined.
|
||||
fn domain(&self) -> Interval;
|
||||
|
||||
/// Write the value of sampling this curve at time `t` into `transform` or `entity`,
|
||||
/// as appropriate, interpolating between the existing value and the sampled value
|
||||
/// using the given `weight`.
|
||||
fn apply<'a>(
|
||||
/// Returns the type ID of the [`AnimationCurveEvaluator`].
|
||||
///
|
||||
/// This must match the type returned by [`Self::create_evaluator`]. It must
|
||||
/// be a single type that doesn't depend on the type of the curve.
|
||||
fn evaluator_type(&self) -> TypeId;
|
||||
|
||||
/// Returns a newly-instantiated [`AnimationCurveEvaluator`] for use with
|
||||
/// this curve.
|
||||
///
|
||||
/// All curve types must return the same type of
|
||||
/// [`AnimationCurveEvaluator`]. The returned value must match the type
|
||||
/// returned by [`Self::evaluator_type`].
|
||||
fn create_evaluator(&self) -> Box<dyn AnimationCurveEvaluator>;
|
||||
|
||||
/// Samples the curve at the given time `t`, and pushes the sampled value
|
||||
/// onto the evaluation stack of the `curve_evaluator`.
|
||||
///
|
||||
/// The `curve_evaluator` parameter points to the value returned by
|
||||
/// [`Self::create_evaluator`], upcast to an `&mut dyn
|
||||
/// AnimationCurveEvaluator`. Typically, implementations of [`Self::apply`]
|
||||
/// will want to downcast the `curve_evaluator` parameter to the concrete
|
||||
/// type [`Self::evaluator_type`] in order to push values of the appropriate
|
||||
/// type onto its evaluation stack.
|
||||
///
|
||||
/// Be sure not to confuse the `t` and `weight` values. The former
|
||||
/// determines the position at which the *curve* is sampled, while `weight`
|
||||
/// ultimately determines how much the *stack values* will be blended
|
||||
/// together (see the definition of [`AnimationCurveEvaluator::blend`]).
|
||||
fn apply(
|
||||
&self,
|
||||
curve_evaluator: &mut dyn AnimationCurveEvaluator,
|
||||
t: f32,
|
||||
weight: f32,
|
||||
graph_node: AnimationNodeIndex,
|
||||
) -> Result<(), AnimationEvaluationError>;
|
||||
}
|
||||
|
||||
/// A low-level trait for use in [`crate::VariableCurve`] that provides fine
|
||||
/// control over how animations are evaluated.
|
||||
///
|
||||
/// You can implement this trait when the generic [`AnimatableCurveEvaluator`]
|
||||
/// isn't sufficiently-expressive for your needs. For example, [`MorphWeights`]
|
||||
/// implements this trait instead of using [`AnimatableCurveEvaluator`] because
|
||||
/// it needs to animate arbitrarily many weights at once, which can't be done
|
||||
/// with [`Animatable`] as that works on fixed-size values only.
|
||||
///
|
||||
/// If you implement this trait, you should also implement [`AnimationCurve`] on
|
||||
/// your curve type, as that trait allows creating instances of this one.
|
||||
///
|
||||
/// Implementations of [`AnimatableCurveEvaluator`] should maintain a *stack* of
|
||||
/// (value, weight, node index) triples, as well as a *blend register*, which is
|
||||
/// either a (value, weight) pair or empty. *Value* here refers to an instance
|
||||
/// of the value being animated: for example, [`Vec3`] in the case of
|
||||
/// translation keyframes. The stack stores intermediate values generated while
|
||||
/// evaluating the [`crate::graph::AnimationGraph`], while the blend register
|
||||
/// stores the result of a blend operation.
|
||||
pub trait AnimationCurveEvaluator: Reflect {
|
||||
/// Blends the top element of the stack with the blend register.
|
||||
///
|
||||
/// The semantics of this method are as follows:
|
||||
///
|
||||
/// 1. Pop the top element of the stack. Call its value vₘ and its weight
|
||||
/// wₘ. If the stack was empty, return success.
|
||||
///
|
||||
/// 2. If the blend register is empty, set the blend register value to vₘ
|
||||
/// and the blend register weight to wₘ; then, return success.
|
||||
///
|
||||
/// 3. If the blend register is nonempty, call its current value vₙ and its
|
||||
/// current weight wₙ. Then, set the value of the blend register to
|
||||
/// `interpolate(vₙ, vₘ, wₘ / (wₘ + wₙ))`, and set the weight of the blend
|
||||
/// register to wₘ + wₙ.
|
||||
///
|
||||
/// 4. Return success.
|
||||
fn blend(&mut self, graph_node: AnimationNodeIndex) -> Result<(), AnimationEvaluationError>;
|
||||
|
||||
/// Pushes the current value of the blend register onto the stack.
|
||||
///
|
||||
/// If the blend register is empty, this method does nothing successfully.
|
||||
/// Otherwise, this method pushes the current value of the blend register
|
||||
/// onto the stack, alongside the weight and graph node supplied to this
|
||||
/// function. The weight present in the blend register is discarded; only
|
||||
/// the weight parameter to this function is pushed onto the stack. The
|
||||
/// blend register is emptied after this process.
|
||||
fn push_blend_register(
|
||||
&mut self,
|
||||
weight: f32,
|
||||
graph_node: AnimationNodeIndex,
|
||||
) -> Result<(), AnimationEvaluationError>;
|
||||
|
||||
/// Pops the top value off the stack and writes it into the appropriate
|
||||
/// component.
|
||||
///
|
||||
/// If the stack is empty, this method does nothing successfully. Otherwise,
|
||||
/// it pops the top value off the stack, fetches the associated component
|
||||
/// from either the `transform` or `entity` values as appropriate, and
|
||||
/// updates the appropriate property with the value popped from the stack.
|
||||
/// The weight and node index associated with the popped stack element are
|
||||
/// discarded. After doing this, the stack is emptied.
|
||||
///
|
||||
/// The property on the component must be overwritten with the value from
|
||||
/// the stack, not blended with it.
|
||||
fn commit<'a>(
|
||||
&mut self,
|
||||
transform: Option<Mut<'a, Transform>>,
|
||||
entity: AnimationEntityMut<'a>,
|
||||
weight: f32,
|
||||
) -> Result<(), AnimationEvaluationError>;
|
||||
}
|
||||
|
||||
|
|
@ -496,3 +1047,10 @@ where
|
|||
})
|
||||
}
|
||||
}
|
||||
|
||||
fn inconsistent<P>() -> AnimationEvaluationError
|
||||
where
|
||||
P: 'static + ?Sized,
|
||||
{
|
||||
AnimationEvaluationError::InconsistentEvaluatorImplementation(TypeId::of::<P>())
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,14 +1,25 @@
|
|||
//! The animation graph, which allows animations to be blended together.
|
||||
|
||||
use core::ops::{Index, IndexMut};
|
||||
use core::iter;
|
||||
use core::ops::{Index, IndexMut, Range};
|
||||
use std::io::{self, Write};
|
||||
|
||||
use bevy_asset::{io::Reader, Asset, AssetId, AssetLoader, AssetPath, Handle, LoadContext};
|
||||
use bevy_asset::{
|
||||
io::Reader, Asset, AssetEvent, AssetId, AssetLoader, AssetPath, Assets, Handle, LoadContext,
|
||||
};
|
||||
use bevy_ecs::{
|
||||
event::EventReader,
|
||||
system::{Res, ResMut, Resource},
|
||||
};
|
||||
use bevy_reflect::{Reflect, ReflectSerialize};
|
||||
use bevy_utils::HashMap;
|
||||
use petgraph::graph::{DiGraph, NodeIndex};
|
||||
use petgraph::{
|
||||
graph::{DiGraph, NodeIndex},
|
||||
Direction,
|
||||
};
|
||||
use ron::de::SpannedError;
|
||||
use serde::{Deserialize, Serialize};
|
||||
use smallvec::SmallVec;
|
||||
use thiserror::Error;
|
||||
|
||||
use crate::{AnimationClip, AnimationTargetId};
|
||||
|
|
@ -172,6 +183,99 @@ pub enum AnimationGraphLoadError {
|
|||
SpannedRon(#[from] SpannedError),
|
||||
}
|
||||
|
||||
/// Acceleration structures for animation graphs that allows Bevy to evaluate
|
||||
/// them quickly.
|
||||
///
|
||||
/// These are kept up to date as [`AnimationGraph`] instances are added,
|
||||
/// modified, and removed.
|
||||
#[derive(Default, Reflect, Resource)]
|
||||
pub struct ThreadedAnimationGraphs(
|
||||
pub(crate) HashMap<AssetId<AnimationGraph>, ThreadedAnimationGraph>,
|
||||
);
|
||||
|
||||
/// An acceleration structure for an animation graph that allows Bevy to
|
||||
/// evaluate it quickly.
|
||||
///
|
||||
/// This is kept up to date as the associated [`AnimationGraph`] instance is
|
||||
/// added, modified, or removed.
|
||||
#[derive(Default, Reflect)]
|
||||
pub struct ThreadedAnimationGraph {
|
||||
/// A cached postorder traversal of the graph.
|
||||
///
|
||||
/// The node indices here are stored in postorder. Siblings are stored in
|
||||
/// descending order. This is because the
|
||||
/// [`crate::animation_curves::AnimationCurveEvaluator`] uses a stack for
|
||||
/// evaluation. Consider this graph:
|
||||
///
|
||||
/// ```text
|
||||
/// ┌─────┐
|
||||
/// │ │
|
||||
/// │ 1 │
|
||||
/// │ │
|
||||
/// └──┬──┘
|
||||
/// │
|
||||
/// ┌───────┼───────┐
|
||||
/// │ │ │
|
||||
/// ▼ ▼ ▼
|
||||
/// ┌─────┐ ┌─────┐ ┌─────┐
|
||||
/// │ │ │ │ │ │
|
||||
/// │ 2 │ │ 3 │ │ 4 │
|
||||
/// │ │ │ │ │ │
|
||||
/// └──┬──┘ └─────┘ └─────┘
|
||||
/// │
|
||||
/// ┌───┴───┐
|
||||
/// │ │
|
||||
/// ▼ ▼
|
||||
/// ┌─────┐ ┌─────┐
|
||||
/// │ │ │ │
|
||||
/// │ 5 │ │ 6 │
|
||||
/// │ │ │ │
|
||||
/// └─────┘ └─────┘
|
||||
/// ```
|
||||
///
|
||||
/// The postorder traversal in this case will be (4, 3, 6, 5, 2, 1).
|
||||
///
|
||||
/// The fact that the children of each node are sorted in reverse ensures
|
||||
/// that, at each level, the order of blending proceeds in ascending order
|
||||
/// by node index, as we guarantee. To illustrate this, consider the way
|
||||
/// the graph above is evaluated. (Interpolation is represented with the ⊕
|
||||
/// symbol.)
|
||||
///
|
||||
/// | Step | Node | Operation | Stack (after operation) | Blend Register |
|
||||
/// | ---- | ---- | ---------- | ----------------------- | -------------- |
|
||||
/// | 1 | 4 | Push | 4 | |
|
||||
/// | 2 | 3 | Push | 4 3 | |
|
||||
/// | 3 | 6 | Push | 4 3 6 | |
|
||||
/// | 4 | 5 | Push | 4 3 6 5 | |
|
||||
/// | 5 | 2 | Blend 5 | 4 3 6 | 5 |
|
||||
/// | 6 | 2 | Blend 6 | 4 3 | 5 ⊕ 6 |
|
||||
/// | 7 | 2 | Push Blend | 4 3 2 | |
|
||||
/// | 8 | 1 | Blend 2 | 4 3 | 2 |
|
||||
/// | 9 | 1 | Blend 3 | 4 | 2 ⊕ 3 |
|
||||
/// | 10 | 1 | Blend 4 | | 2 ⊕ 3 ⊕ 4 |
|
||||
/// | 11 | 1 | Push Blend | 1 | |
|
||||
/// | 12 | | Commit | | |
|
||||
pub threaded_graph: Vec<AnimationNodeIndex>,
|
||||
|
||||
/// A mapping from each parent node index to the range within
|
||||
/// [`Self::sorted_edges`].
|
||||
///
|
||||
/// This allows for quick lookup of the children of each node, sorted in
|
||||
/// ascending order of node index, without having to sort the result of the
|
||||
/// `petgraph` traversal functions every frame.
|
||||
pub sorted_edge_ranges: Vec<Range<u32>>,
|
||||
|
||||
/// A list of the children of each node, sorted in ascending order.
|
||||
pub sorted_edges: Vec<AnimationNodeIndex>,
|
||||
|
||||
/// A mapping from node index to a bitfield specifying the mask groups that
|
||||
/// this node masks *out* (i.e. doesn't animate).
|
||||
///
|
||||
/// A 1 in bit position N indicates that this node doesn't animate any
|
||||
/// targets of mask group N.
|
||||
pub computed_masks: Vec<u64>,
|
||||
}
|
||||
|
||||
/// A version of [`AnimationGraph`] suitable for serializing as an asset.
|
||||
///
|
||||
/// Animation nodes can refer to external animation clips, and the [`AssetId`]
|
||||
|
|
@ -571,3 +675,112 @@ impl From<AnimationGraph> for SerializedAnimationGraph {
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// A system that creates, updates, and removes [`ThreadedAnimationGraph`]
|
||||
/// structures for every changed [`AnimationGraph`].
|
||||
///
|
||||
/// The [`ThreadedAnimationGraph`] contains acceleration structures that allow
|
||||
/// for quick evaluation of that graph's animations.
|
||||
pub(crate) fn thread_animation_graphs(
|
||||
mut threaded_animation_graphs: ResMut<ThreadedAnimationGraphs>,
|
||||
animation_graphs: Res<Assets<AnimationGraph>>,
|
||||
mut animation_graph_asset_events: EventReader<AssetEvent<AnimationGraph>>,
|
||||
) {
|
||||
for animation_graph_asset_event in animation_graph_asset_events.read() {
|
||||
match *animation_graph_asset_event {
|
||||
AssetEvent::Added { id }
|
||||
| AssetEvent::Modified { id }
|
||||
| AssetEvent::LoadedWithDependencies { id } => {
|
||||
// Fetch the animation graph.
|
||||
let Some(animation_graph) = animation_graphs.get(id) else {
|
||||
continue;
|
||||
};
|
||||
|
||||
// Reuse the allocation if possible.
|
||||
let mut threaded_animation_graph =
|
||||
threaded_animation_graphs.0.remove(&id).unwrap_or_default();
|
||||
threaded_animation_graph.clear();
|
||||
|
||||
// Recursively thread the graph in postorder.
|
||||
threaded_animation_graph.init(animation_graph);
|
||||
threaded_animation_graph.build_from(
|
||||
&animation_graph.graph,
|
||||
animation_graph.root,
|
||||
0,
|
||||
);
|
||||
|
||||
// Write in the threaded graph.
|
||||
threaded_animation_graphs
|
||||
.0
|
||||
.insert(id, threaded_animation_graph);
|
||||
}
|
||||
|
||||
AssetEvent::Removed { id } => {
|
||||
threaded_animation_graphs.0.remove(&id);
|
||||
}
|
||||
AssetEvent::Unused { .. } => {}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl ThreadedAnimationGraph {
|
||||
/// Removes all the data in this [`ThreadedAnimationGraph`], keeping the
|
||||
/// memory around for later reuse.
|
||||
fn clear(&mut self) {
|
||||
self.threaded_graph.clear();
|
||||
self.sorted_edge_ranges.clear();
|
||||
self.sorted_edges.clear();
|
||||
}
|
||||
|
||||
/// Prepares the [`ThreadedAnimationGraph`] for recursion.
|
||||
fn init(&mut self, animation_graph: &AnimationGraph) {
|
||||
let node_count = animation_graph.graph.node_count();
|
||||
let edge_count = animation_graph.graph.edge_count();
|
||||
|
||||
self.threaded_graph.reserve(node_count);
|
||||
self.sorted_edges.reserve(edge_count);
|
||||
|
||||
self.sorted_edge_ranges.clear();
|
||||
self.sorted_edge_ranges
|
||||
.extend(iter::repeat(0..0).take(node_count));
|
||||
|
||||
self.computed_masks.clear();
|
||||
self.computed_masks.extend(iter::repeat(0).take(node_count));
|
||||
}
|
||||
|
||||
/// Recursively constructs the [`ThreadedAnimationGraph`] for the subtree
|
||||
/// rooted at the given node.
|
||||
///
|
||||
/// `mask` specifies the computed mask of the parent node. (It could be
|
||||
/// fetched from the [`Self::computed_masks`] field, but we pass it
|
||||
/// explicitly as a micro-optimization.)
|
||||
fn build_from(
|
||||
&mut self,
|
||||
graph: &AnimationDiGraph,
|
||||
node_index: AnimationNodeIndex,
|
||||
mut mask: u64,
|
||||
) {
|
||||
// Accumulate the mask.
|
||||
mask |= graph.node_weight(node_index).unwrap().mask;
|
||||
self.computed_masks.insert(node_index.index(), mask);
|
||||
|
||||
// Gather up the indices of our children, and sort them.
|
||||
let mut kids: SmallVec<[AnimationNodeIndex; 8]> = graph
|
||||
.neighbors_directed(node_index, Direction::Outgoing)
|
||||
.collect();
|
||||
kids.sort_unstable();
|
||||
|
||||
// Write in the list of kids.
|
||||
self.sorted_edge_ranges[node_index.index()] =
|
||||
(self.sorted_edges.len() as u32)..((self.sorted_edges.len() + kids.len()) as u32);
|
||||
self.sorted_edges.extend_from_slice(&kids);
|
||||
|
||||
// Recurse. (This is a postorder traversal.)
|
||||
for kid in kids.into_iter().rev() {
|
||||
self.build_from(graph, kid, mask);
|
||||
}
|
||||
|
||||
// Finally, push our index.
|
||||
self.threaded_graph.push(node_index);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -16,7 +16,6 @@ pub mod graph;
|
|||
pub mod transition;
|
||||
mod util;
|
||||
|
||||
use alloc::collections::BTreeMap;
|
||||
use core::{
|
||||
any::{Any, TypeId},
|
||||
cell::RefCell,
|
||||
|
|
@ -24,6 +23,9 @@ use core::{
|
|||
hash::{Hash, Hasher},
|
||||
iter,
|
||||
};
|
||||
use prelude::AnimationCurveEvaluator;
|
||||
|
||||
use crate::graph::ThreadedAnimationGraphs;
|
||||
|
||||
use bevy_app::{App, Plugin, PostUpdate};
|
||||
use bevy_asset::{Asset, AssetApp, Assets, Handle};
|
||||
|
|
@ -46,11 +48,9 @@ use bevy_ui::UiSystem;
|
|||
use bevy_utils::{
|
||||
hashbrown::HashMap,
|
||||
tracing::{trace, warn},
|
||||
NoOpHash,
|
||||
NoOpHash, TypeIdMap,
|
||||
};
|
||||
use fixedbitset::FixedBitSet;
|
||||
use graph::AnimationMask;
|
||||
use petgraph::{graph::NodeIndex, Direction};
|
||||
use petgraph::graph::NodeIndex;
|
||||
use serde::{Deserialize, Serialize};
|
||||
use thread_local::ThreadLocal;
|
||||
use uuid::Uuid;
|
||||
|
|
@ -461,6 +461,14 @@ pub enum AnimationEvaluationError {
|
|||
/// The component to be animated was present, but the property on the
|
||||
/// component wasn't present.
|
||||
PropertyNotPresent(TypeId),
|
||||
|
||||
/// An internal error occurred in the implementation of
|
||||
/// [`AnimationCurveEvaluator`].
|
||||
///
|
||||
/// You shouldn't ordinarily see this error unless you implemented
|
||||
/// [`AnimationCurveEvaluator`] yourself. The contained [`TypeId`] is the ID
|
||||
/// of the curve evaluator.
|
||||
InconsistentEvaluatorImplementation(TypeId),
|
||||
}
|
||||
|
||||
/// An animation that an [`AnimationPlayer`] is currently either playing or was
|
||||
|
|
@ -471,12 +479,8 @@ pub enum AnimationEvaluationError {
|
|||
pub struct ActiveAnimation {
|
||||
/// The factor by which the weight from the [`AnimationGraph`] is multiplied.
|
||||
weight: f32,
|
||||
/// The actual weight of this animation this frame, taking the
|
||||
/// [`AnimationGraph`] into account.
|
||||
computed_weight: f32,
|
||||
/// The mask groups that are masked out (i.e. won't be animated) this frame,
|
||||
/// taking the `AnimationGraph` into account.
|
||||
computed_mask: AnimationMask,
|
||||
repeat: RepeatAnimation,
|
||||
speed: f32,
|
||||
/// Total time the animation has been played.
|
||||
|
|
@ -497,8 +501,6 @@ impl Default for ActiveAnimation {
|
|||
fn default() -> Self {
|
||||
Self {
|
||||
weight: 1.0,
|
||||
computed_weight: 1.0,
|
||||
computed_mask: 0,
|
||||
repeat: RepeatAnimation::default(),
|
||||
speed: 1.0,
|
||||
elapsed: 0.0,
|
||||
|
|
@ -658,9 +660,7 @@ impl ActiveAnimation {
|
|||
#[derive(Component, Default, Reflect)]
|
||||
#[reflect(Component, Default)]
|
||||
pub struct AnimationPlayer {
|
||||
/// We use a `BTreeMap` instead of a `HashMap` here to ensure a consistent
|
||||
/// ordering when applying the animations.
|
||||
active_animations: BTreeMap<AnimationNodeIndex, ActiveAnimation>,
|
||||
active_animations: HashMap<AnimationNodeIndex, ActiveAnimation>,
|
||||
blend_weights: HashMap<AnimationNodeIndex, f32>,
|
||||
}
|
||||
|
||||
|
|
@ -679,27 +679,29 @@ impl Clone for AnimationPlayer {
|
|||
}
|
||||
}
|
||||
|
||||
/// Information needed during the traversal of the animation graph in
|
||||
/// [`advance_animations`].
|
||||
/// Temporary data that the [`animate_targets`] system maintains.
|
||||
#[derive(Default)]
|
||||
pub struct AnimationGraphEvaluator {
|
||||
/// The stack used for the depth-first search of the graph.
|
||||
dfs_stack: Vec<NodeIndex>,
|
||||
/// The list of visited nodes during the depth-first traversal.
|
||||
dfs_visited: FixedBitSet,
|
||||
/// Accumulated weights and masks for each node.
|
||||
nodes: Vec<EvaluatedAnimationGraphNode>,
|
||||
}
|
||||
pub struct AnimationEvaluationState {
|
||||
/// Stores all [`AnimationCurveEvaluator`]s corresponding to properties that
|
||||
/// we've seen so far.
|
||||
///
|
||||
/// This is a mapping from the type ID of an animation curve evaluator to
|
||||
/// the animation curve evaluator itself.
|
||||
///
|
||||
/// For efficiency's sake, the [`AnimationCurveEvaluator`]s are cached from
|
||||
/// frame to frame and animation target to animation target. Therefore,
|
||||
/// there may be entries in this list corresponding to properties that the
|
||||
/// current [`AnimationPlayer`] doesn't animate. To iterate only over the
|
||||
/// properties that are currently being animated, consult the
|
||||
/// [`Self::current_curve_evaluator_types`] set.
|
||||
curve_evaluators: TypeIdMap<Box<dyn AnimationCurveEvaluator>>,
|
||||
|
||||
/// The accumulated weight and computed mask for a single node.
|
||||
#[derive(Clone, Copy, Default, Debug)]
|
||||
struct EvaluatedAnimationGraphNode {
|
||||
/// The weight that has been accumulated for this node, taking its
|
||||
/// ancestors' weights into account.
|
||||
weight: f32,
|
||||
/// The mask that has been computed for this node, taking its ancestors'
|
||||
/// masks into account.
|
||||
mask: AnimationMask,
|
||||
/// The set of [`AnimationCurveEvaluator`] types that the current
|
||||
/// [`AnimationPlayer`] is animating.
|
||||
///
|
||||
/// This is built up as new curve evaluators are encountered during graph
|
||||
/// traversal.
|
||||
current_curve_evaluator_types: TypeIdMap<()>,
|
||||
}
|
||||
|
||||
impl AnimationPlayer {
|
||||
|
|
@ -845,7 +847,6 @@ pub fn advance_animations(
|
|||
animation_clips: Res<Assets<AnimationClip>>,
|
||||
animation_graphs: Res<Assets<AnimationGraph>>,
|
||||
mut players: Query<(&mut AnimationPlayer, &Handle<AnimationGraph>)>,
|
||||
animation_graph_evaluator: Local<ThreadLocal<RefCell<AnimationGraphEvaluator>>>,
|
||||
) {
|
||||
let delta_seconds = time.delta_seconds();
|
||||
players
|
||||
|
|
@ -856,40 +857,15 @@ pub fn advance_animations(
|
|||
};
|
||||
|
||||
// Tick animations, and schedule them.
|
||||
//
|
||||
// We use a thread-local here so we can reuse allocations across
|
||||
// frames.
|
||||
let mut evaluator = animation_graph_evaluator.get_or_default().borrow_mut();
|
||||
|
||||
let AnimationPlayer {
|
||||
ref mut active_animations,
|
||||
ref blend_weights,
|
||||
..
|
||||
} = *player;
|
||||
|
||||
// Reset our state.
|
||||
evaluator.reset(animation_graph.root, animation_graph.graph.node_count());
|
||||
|
||||
while let Some(node_index) = evaluator.dfs_stack.pop() {
|
||||
// Skip if we've already visited this node.
|
||||
if evaluator.dfs_visited.put(node_index.index()) {
|
||||
continue;
|
||||
}
|
||||
|
||||
for node_index in animation_graph.graph.node_indices() {
|
||||
let node = &animation_graph[node_index];
|
||||
|
||||
// Calculate weight and mask from the graph.
|
||||
let (mut weight, mut mask) = (node.weight, node.mask);
|
||||
for parent_index in animation_graph
|
||||
.graph
|
||||
.neighbors_directed(node_index, Direction::Incoming)
|
||||
{
|
||||
let evaluated_parent = &evaluator.nodes[parent_index.index()];
|
||||
weight *= evaluated_parent.weight;
|
||||
mask |= evaluated_parent.mask;
|
||||
}
|
||||
evaluator.nodes[node_index.index()] = EvaluatedAnimationGraphNode { weight, mask };
|
||||
|
||||
if let Some(active_animation) = active_animations.get_mut(&node_index) {
|
||||
// Tick the animation if necessary.
|
||||
if !active_animation.paused {
|
||||
|
|
@ -899,24 +875,7 @@ pub fn advance_animations(
|
|||
}
|
||||
}
|
||||
}
|
||||
|
||||
weight *= active_animation.weight;
|
||||
} else if let Some(&blend_weight) = blend_weights.get(&node_index) {
|
||||
weight *= blend_weight;
|
||||
}
|
||||
|
||||
// Write in the computed weight and mask for this node.
|
||||
if let Some(active_animation) = active_animations.get_mut(&node_index) {
|
||||
active_animation.computed_weight = weight;
|
||||
active_animation.computed_mask = mask;
|
||||
}
|
||||
|
||||
// Push children.
|
||||
evaluator.dfs_stack.extend(
|
||||
animation_graph
|
||||
.graph
|
||||
.neighbors_directed(node_index, Direction::Outgoing),
|
||||
);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
|
@ -937,13 +896,15 @@ pub type AnimationEntityMut<'w> = EntityMutExcept<
|
|||
pub fn animate_targets(
|
||||
clips: Res<Assets<AnimationClip>>,
|
||||
graphs: Res<Assets<AnimationGraph>>,
|
||||
threaded_animation_graphs: Res<ThreadedAnimationGraphs>,
|
||||
players: Query<(&AnimationPlayer, &Handle<AnimationGraph>)>,
|
||||
mut targets: Query<(&AnimationTarget, Option<&mut Transform>, AnimationEntityMut)>,
|
||||
animation_evaluation_state: Local<ThreadLocal<RefCell<AnimationEvaluationState>>>,
|
||||
) {
|
||||
// Evaluate all animation targets in parallel.
|
||||
targets
|
||||
.par_iter_mut()
|
||||
.for_each(|(target, mut transform, mut entity_mut)| {
|
||||
.for_each(|(target, transform, entity_mut)| {
|
||||
let &AnimationTarget {
|
||||
id: target_id,
|
||||
player: player_id,
|
||||
|
|
@ -955,7 +916,7 @@ pub fn animate_targets(
|
|||
} else {
|
||||
trace!(
|
||||
"Either an animation player {:?} or a graph was missing for the target \
|
||||
entity {:?} ({:?}); no animations will play this frame",
|
||||
entity {:?} ({:?}); no animations will play this frame",
|
||||
player_id,
|
||||
entity_mut.id(),
|
||||
entity_mut.get::<Name>(),
|
||||
|
|
@ -968,6 +929,12 @@ pub fn animate_targets(
|
|||
return;
|
||||
};
|
||||
|
||||
let Some(threaded_animation_graph) =
|
||||
threaded_animation_graphs.0.get(&animation_graph_id)
|
||||
else {
|
||||
return;
|
||||
};
|
||||
|
||||
// Determine which mask groups this animation target belongs to.
|
||||
let target_mask = animation_graph
|
||||
.mask_groups
|
||||
|
|
@ -975,63 +942,104 @@ pub fn animate_targets(
|
|||
.cloned()
|
||||
.unwrap_or_default();
|
||||
|
||||
// Apply the animations one after another. The way we accumulate
|
||||
// weights ensures that the order we apply them in doesn't matter.
|
||||
//
|
||||
// Proof: Consider three animations A₀, A₁, A₂, … with weights w₀,
|
||||
// w₁, w₂, … respectively. We seek the value:
|
||||
//
|
||||
// A₀w₀ + A₁w₁ + A₂w₂ + ⋯
|
||||
//
|
||||
// Defining lerp(a, b, t) = a + t(b - a), we have:
|
||||
//
|
||||
// ⎛ ⎛ w₁ ⎞ w₂ ⎞
|
||||
// A₀w₀ + A₁w₁ + A₂w₂ + ⋯ = ⋯ lerp⎜lerp⎜A₀, A₁, ⎯⎯⎯⎯⎯⎯⎯⎯⎟, A₂, ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎟ ⋯
|
||||
// ⎝ ⎝ w₀ + w₁⎠ w₀ + w₁ + w₂⎠
|
||||
//
|
||||
// Each step of the following loop corresponds to one of the lerp
|
||||
// operations above.
|
||||
let mut total_weight = 0.0;
|
||||
for (&animation_graph_node_index, active_animation) in
|
||||
animation_player.active_animations.iter()
|
||||
{
|
||||
// If the weight is zero or the current animation target is
|
||||
// masked out, stop here.
|
||||
if active_animation.weight == 0.0
|
||||
|| (target_mask & active_animation.computed_mask) != 0
|
||||
{
|
||||
continue;
|
||||
}
|
||||
let mut evaluation_state = animation_evaluation_state.get_or_default().borrow_mut();
|
||||
let evaluation_state = &mut *evaluation_state;
|
||||
|
||||
let Some(clip) = animation_graph
|
||||
.get(animation_graph_node_index)
|
||||
.and_then(|animation_graph_node| animation_graph_node.clip.as_ref())
|
||||
.and_then(|animation_clip_handle| clips.get(animation_clip_handle))
|
||||
// Evaluate the graph.
|
||||
for &animation_graph_node_index in threaded_animation_graph.threaded_graph.iter() {
|
||||
let Some(animation_graph_node) = animation_graph.get(animation_graph_node_index)
|
||||
else {
|
||||
continue;
|
||||
};
|
||||
|
||||
let Some(curves) = clip.curves_for_target(target_id) else {
|
||||
continue;
|
||||
};
|
||||
match animation_graph_node.clip {
|
||||
None => {
|
||||
// This is a blend node.
|
||||
for edge_index in threaded_animation_graph.sorted_edge_ranges
|
||||
[animation_graph_node_index.index()]
|
||||
.clone()
|
||||
{
|
||||
if let Err(err) = evaluation_state.blend_all(
|
||||
threaded_animation_graph.sorted_edges[edge_index as usize],
|
||||
) {
|
||||
warn!("Failed to blend animation: {:?}", err);
|
||||
}
|
||||
}
|
||||
|
||||
let weight = active_animation.computed_weight;
|
||||
total_weight += weight;
|
||||
if let Err(err) = evaluation_state.push_blend_register_all(
|
||||
animation_graph_node.weight,
|
||||
animation_graph_node_index,
|
||||
) {
|
||||
warn!("Animation blending failed: {:?}", err);
|
||||
}
|
||||
}
|
||||
|
||||
let weight = weight / total_weight;
|
||||
let seek_time = active_animation.seek_time;
|
||||
Some(ref animation_clip_handle) => {
|
||||
// This is a clip node.
|
||||
let Some(active_animation) = animation_player
|
||||
.active_animations
|
||||
.get(&animation_graph_node_index)
|
||||
else {
|
||||
continue;
|
||||
};
|
||||
|
||||
for curve in curves {
|
||||
if let Err(err) = curve.0.apply(
|
||||
seek_time,
|
||||
transform.as_mut().map(|transform| transform.reborrow()),
|
||||
entity_mut.reborrow(),
|
||||
weight,
|
||||
) {
|
||||
warn!("Animation application failed: {:?}", err);
|
||||
// If the weight is zero or the current animation target is
|
||||
// masked out, stop here.
|
||||
if active_animation.weight == 0.0
|
||||
|| (target_mask
|
||||
& threaded_animation_graph.computed_masks
|
||||
[animation_graph_node_index.index()])
|
||||
!= 0
|
||||
{
|
||||
continue;
|
||||
}
|
||||
|
||||
let Some(clip) = clips.get(animation_clip_handle) else {
|
||||
continue;
|
||||
};
|
||||
|
||||
let Some(curves) = clip.curves_for_target(target_id) else {
|
||||
continue;
|
||||
};
|
||||
|
||||
let weight = active_animation.weight;
|
||||
let seek_time = active_animation.seek_time;
|
||||
|
||||
for curve in curves {
|
||||
// Fetch the curve evaluator. Curve evaluator types
|
||||
// are unique to each property, but shared among all
|
||||
// curve types. For example, given two curve types A
|
||||
// and B, `RotationCurve<A>` and `RotationCurve<B>`
|
||||
// will both yield a `RotationCurveEvaluator` and
|
||||
// therefore will share the same evaluator in this
|
||||
// table.
|
||||
let curve_evaluator_type_id = (*curve.0).evaluator_type();
|
||||
let curve_evaluator = evaluation_state
|
||||
.curve_evaluators
|
||||
.entry(curve_evaluator_type_id)
|
||||
.or_insert_with(|| curve.0.create_evaluator());
|
||||
|
||||
evaluation_state
|
||||
.current_curve_evaluator_types
|
||||
.insert(curve_evaluator_type_id, ());
|
||||
|
||||
if let Err(err) = AnimationCurve::apply(
|
||||
&*curve.0,
|
||||
&mut **curve_evaluator,
|
||||
seek_time,
|
||||
weight,
|
||||
animation_graph_node_index,
|
||||
) {
|
||||
warn!("Animation application failed: {:?}", err);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if let Err(err) = evaluation_state.commit_all(transform, entity_mut) {
|
||||
warn!("Animation application failed: {:?}", err);
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
|
|
@ -1050,9 +1058,12 @@ impl Plugin for AnimationPlugin {
|
|||
.register_type::<AnimationTarget>()
|
||||
.register_type::<AnimationTransitions>()
|
||||
.register_type::<NodeIndex>()
|
||||
.register_type::<ThreadedAnimationGraphs>()
|
||||
.init_resource::<ThreadedAnimationGraphs>()
|
||||
.add_systems(
|
||||
PostUpdate,
|
||||
(
|
||||
graph::thread_animation_graphs,
|
||||
advance_transitions,
|
||||
advance_animations,
|
||||
// TODO: `animate_targets` can animate anything, so
|
||||
|
|
@ -1100,17 +1111,63 @@ impl From<&Name> for AnimationTargetId {
|
|||
}
|
||||
}
|
||||
|
||||
impl AnimationGraphEvaluator {
|
||||
// Starts a new depth-first search.
|
||||
fn reset(&mut self, root: AnimationNodeIndex, node_count: usize) {
|
||||
self.dfs_stack.clear();
|
||||
self.dfs_stack.push(root);
|
||||
impl AnimationEvaluationState {
|
||||
/// Calls [`AnimationCurveEvaluator::blend`] on all curve evaluator types
|
||||
/// that we've been building up for a single target.
|
||||
///
|
||||
/// The given `node_index` is the node that we're evaluating.
|
||||
fn blend_all(
|
||||
&mut self,
|
||||
node_index: AnimationNodeIndex,
|
||||
) -> Result<(), AnimationEvaluationError> {
|
||||
for curve_evaluator_type in self.current_curve_evaluator_types.keys() {
|
||||
self.curve_evaluators
|
||||
.get_mut(curve_evaluator_type)
|
||||
.unwrap()
|
||||
.blend(node_index)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
self.dfs_visited.grow(node_count);
|
||||
self.dfs_visited.clear();
|
||||
/// Calls [`AnimationCurveEvaluator::push_blend_register`] on all curve
|
||||
/// evaluator types that we've been building up for a single target.
|
||||
///
|
||||
/// The `weight` parameter is the weight that should be pushed onto the
|
||||
/// stack, while the `node_index` parameter is the node that we're
|
||||
/// evaluating.
|
||||
fn push_blend_register_all(
|
||||
&mut self,
|
||||
weight: f32,
|
||||
node_index: AnimationNodeIndex,
|
||||
) -> Result<(), AnimationEvaluationError> {
|
||||
for curve_evaluator_type in self.current_curve_evaluator_types.keys() {
|
||||
self.curve_evaluators
|
||||
.get_mut(curve_evaluator_type)
|
||||
.unwrap()
|
||||
.push_blend_register(weight, node_index)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
self.nodes.clear();
|
||||
self.nodes
|
||||
.extend(iter::repeat(EvaluatedAnimationGraphNode::default()).take(node_count));
|
||||
/// Calls [`AnimationCurveEvaluator::commit`] on all curve evaluator types
|
||||
/// that we've been building up for a single target.
|
||||
///
|
||||
/// This is the call that actually writes the computed values into the
|
||||
/// components being animated.
|
||||
fn commit_all(
|
||||
&mut self,
|
||||
mut transform: Option<Mut<Transform>>,
|
||||
mut entity_mut: AnimationEntityMut,
|
||||
) -> Result<(), AnimationEvaluationError> {
|
||||
for (curve_evaluator_type, _) in self.current_curve_evaluator_types.drain() {
|
||||
self.curve_evaluators
|
||||
.get_mut(&curve_evaluator_type)
|
||||
.unwrap()
|
||||
.commit(
|
||||
transform.as_mut().map(|transform| transform.reborrow()),
|
||||
entity_mut.reborrow(),
|
||||
)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -47,24 +47,24 @@ static NODE_RECTS: [NodeRect; 5] = [
|
|||
NodeRect::new(10.00, 10.00, 97.64, 48.41),
|
||||
NodeRect::new(10.00, 78.41, 97.64, 48.41),
|
||||
NodeRect::new(286.08, 78.41, 97.64, 48.41),
|
||||
NodeRect::new(148.04, 44.20, 97.64, 48.41),
|
||||
NodeRect::new(148.04, 112.61, 97.64, 48.41), // was 44.20
|
||||
NodeRect::new(10.00, 146.82, 97.64, 48.41),
|
||||
];
|
||||
|
||||
/// The positions of the horizontal lines in the UI.
|
||||
static HORIZONTAL_LINES: [Line; 6] = [
|
||||
Line::new(107.64, 34.21, 20.20),
|
||||
Line::new(107.64, 34.21, 158.24),
|
||||
Line::new(107.64, 102.61, 20.20),
|
||||
Line::new(107.64, 171.02, 158.24),
|
||||
Line::new(127.84, 68.41, 20.20),
|
||||
Line::new(245.68, 68.41, 20.20),
|
||||
Line::new(107.64, 171.02, 20.20),
|
||||
Line::new(127.84, 136.82, 20.20),
|
||||
Line::new(245.68, 136.82, 20.20),
|
||||
Line::new(265.88, 102.61, 20.20),
|
||||
];
|
||||
|
||||
/// The positions of the vertical lines in the UI.
|
||||
static VERTICAL_LINES: [Line; 2] = [
|
||||
Line::new(127.83, 34.21, 68.40),
|
||||
Line::new(265.88, 68.41, 102.61),
|
||||
Line::new(127.83, 102.61, 68.40),
|
||||
Line::new(265.88, 34.21, 102.61),
|
||||
];
|
||||
|
||||
/// Initializes the app.
|
||||
|
|
|
|||
Loading…
Reference in a new issue