Function prepare_depth_of_field_pipelines 

pub fn prepare_depth_of_field_pipelines(
    commands: Commands<'_, '_>,
    pipeline_cache: Res<'_, PipelineCache>,
    pipelines: ResMut<'_, SpecializedRenderPipelines<DepthOfFieldPipeline>>,
    global_bind_group_layout: Res<'_, DepthOfFieldGlobalBindGroupLayout>,
    view_targets: Query<'_, '_, (Entity, &ExtractedView, &DepthOfField, &ViewDepthOfFieldBindGroupLayouts, &Msaa)>,
    fullscreen_shader: Res<'_, FullscreenShader>,
    asset_server: Res<'_, AssetServer>,
)

Specializes the depth of field pipelines specific to a view.