Struct DynamicUniformIndex 

pub struct DynamicUniformIndex<C>
where
    C: Component,
{ /* private fields */ }

Available on crate feature bevy_render only.

Stores the index of a uniform inside of ComponentUniforms.

Implementations

impl<C> DynamicUniformIndex<C>

where C: Component,

pub fn index(&self) -> u32

Examples found in repository

examples/shader_advanced/custom_post_processing.rs (line 200)

fn post_process_system(
    view: ViewQuery<(
        &ViewTarget,
        &DynamicUniformIndex<PostProcessSettings>,
        &PostProcessBindGroups,
    )>,
    post_process_pipeline: Option<Res<PostProcessPipeline>>,
    pipeline_cache: Res<PipelineCache>,
    mut ctx: RenderContext,
) {
    let Some(post_process_pipeline) = post_process_pipeline else {
        return;
    };

    let (view_target, settings_index, bind_groups) = view.into_inner();

    let Some(pipeline) = pipeline_cache.get_render_pipeline(post_process_pipeline.pipeline_id)
    else {
        return;
    };

    // This will start a new "post process write", obtaining two texture
    // views from the view target - a `source` and a `destination`.
    // `source` is the "current" main texture and you _must_ write into
    // `destination` because calling `post_process_write()` on the
    // [`ViewTarget`] will internally flip the [`ViewTarget`]'s main
    // texture to the `destination` texture. Failing to do so will cause
    // the current main texture information to be lost.
    let post_process = view_target.post_process_write();

    // We prepared the bind group ahead of time but now we need to make sure
    // we pick the bind group associated with the source texture
    let (_, bind_group) = if bind_groups.a.0 == post_process.source.id() {
        &bind_groups.a
    } else {
        &bind_groups.b
    };

    let mut render_pass = ctx
        .command_encoder()
        .begin_render_pass(&RenderPassDescriptor {
            label: Some("post_process_pass"),
            color_attachments: &[Some(RenderPassColorAttachment {
                // We need to specify the post process destination view here
                // to make sure we write to the appropriate texture.
                view: post_process.destination,
                depth_slice: None,
                resolve_target: None,
                ops: Operations::default(),
            })],
            depth_stencil_attachment: None,
            timestamp_writes: None,
            occlusion_query_set: None,
            multiview_mask: None,
        });

    render_pass.set_pipeline(pipeline);
    // By passing in the index of the post process settings on this view, we ensure
    // that in the event that multiple settings were sent to the GPU (as would be the
    // case with multiple cameras), we use the correct one.
    render_pass.set_bind_group(0, bind_group, &[settings_index.index()]);
    render_pass.draw(0..3, 0..1);
}

Trait Implementations

impl<C> Component for DynamicUniformIndex<C>

where C: Component, DynamicUniformIndex<C>: Send + Sync + 'static,

const STORAGE_TYPE: StorageType = bevy_ecs::component::StorageType::Table

A constant indicating the storage type used for this component.

type Mutability = Mutable

A marker type to assist Bevy with determining if this component is mutable, or immutable. Mutable components will have Component<Mutability = Mutable>, while immutable components will instead have Component<Mutability = Immutable>.

fn register_required_components( _requiree: ComponentId, required_components: &mut RequiredComponentsRegistrator<'_, '_>, )

Registers required components.

fn clone_behavior() -> ComponentCloneBehavior

Called when registering this component, allowing to override clone function (or disable cloning altogether) for this component.

fn relationship_accessor() -> Option<ComponentRelationshipAccessor<DynamicUniformIndex<C>>>

Returns ComponentRelationshipAccessor required for working with relationships in dynamic contexts.

fn on_add() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_add ComponentHook for this Component if one is defined.

fn on_insert() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_insert ComponentHook for this Component if one is defined.

fn on_discard() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_discard ComponentHook for this Component if one is defined.

fn on_remove() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_remove ComponentHook for this Component if one is defined.

fn on_despawn() -> Option<for<'w> fn(DeferredWorld<'w>, HookContext)>

Gets the on_despawn ComponentHook for this Component if one is defined.

fn map_entities<E>(_this: &mut Self, _mapper: &mut E)

where E: EntityMapper,

Maps the entities on this component using the given EntityMapper. This is used to remap entities in contexts like scenes and entity cloning. When deriving Component, this is populated by annotating fields containing entities with #[entities]

const HAS_SUMMARY_TICK: bool = false

Set this constant to true if the component should track a summary tick.