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Add motion vectors support for animated meshes
Co-authored-by: Robert Swain <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| use std::mem; | ||
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|
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| use bevy_ecs::prelude::Entity; | ||
| use bevy_render::render_resource::{BufferUsages, BufferVec}; | ||
| use bevy_utils::EntityHashMap; | ||
| use bytemuck::Pod; | ||
|
|
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| /// A double buffer of `T`. | ||
| /// | ||
| /// Use [`DoubleBuffer::swap`] to swap buffer, | ||
| /// access the current buffer with [`DoubleBuffer::current`], | ||
| /// and the previous one with [`DoubleBuffer::previous`]. | ||
| #[derive(Default)] | ||
| pub struct DoubleBuffer<T> { | ||
| pub previous: T, | ||
| pub current: T, | ||
| } | ||
|
|
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| impl<T> DoubleBuffer<T> { | ||
| pub fn swap(&mut self, swap_buffer: bool) { | ||
| if swap_buffer { | ||
| mem::swap(&mut self.current, &mut self.previous); | ||
| } | ||
| } | ||
| } | ||
|
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| pub type DoubleBufferVec<T> = DoubleBuffer<BufferVec<T>>; | ||
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| impl<T: Pod> DoubleBufferVec<T> { | ||
| pub const fn new(buffer_usage: BufferUsages) -> Self { | ||
| DoubleBufferVec { | ||
| previous: BufferVec::new(buffer_usage), | ||
| current: BufferVec::new(buffer_usage), | ||
| } | ||
| } | ||
|
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| pub fn clear(&mut self, swap_buffer: bool) { | ||
| self.swap(swap_buffer); | ||
| self.current.clear(); | ||
| } | ||
| } | ||
|
|
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| pub type DoubleEntityMap<T> = DoubleBuffer<EntityHashMap<Entity, T>>; | ||
|
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| impl<T> DoubleEntityMap<T> { | ||
| pub fn clear(&mut self, swap_buffer: bool) { | ||
| self.swap(swap_buffer); | ||
| self.current.clear(); | ||
| } | ||
|
|
||
| pub fn insert(&mut self, entity: Entity, value: T) { | ||
| self.current.insert(entity, value); | ||
| } | ||
|
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| pub fn missing_previous(&self, entity: &Entity) -> bool { | ||
| let current = self.current.contains_key(entity); | ||
| let previous = self.previous.contains_key(entity); | ||
| // Either it's already missing (therefore there is no "previous" to miss) | ||
| // or it's not missing and there is no "previous", so we miss previous. | ||
| current && !previous | ||
| } | ||
| } |
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