Possible fix for bevyengine#1056

crates/bevy_render/src/render_graph/nodes/render_resources_node.rs

@@ -155,10 +155,23 @@ where
  /// Initialize this UniformBufferArrays using information from a RenderResources value.
  fn initialize(
  &mut self,
+ min_size: Option<usize>,
  render_resources: &T,
  render_resource_context: &dyn RenderResourceContext,
  ) {
- if self.buffer_arrays.len() != render_resources.render_resources_len() {
+ let current = self
+ .buffer_arrays
+ .iter()
+ .flatten()
+ .map(|b| b.item_size)
+ .next();
+
+ let resize = match (min_size, current) {
+ (Some(min), Some(current)) if min > current => true,
+ _ => false,
+ };
+
+ if resize || self.buffer_arrays.len() != render_resources.render_resources_len() {
  let mut buffer_arrays = Vec::with_capacity(render_resources.render_resources_len());
  for render_resource in render_resources.iter() {
  if let Some(RenderResourceType::Buffer) = render_resource.resource_type() {
@@ -447,7 +460,7 @@ fn render_resources_node_system<T: RenderResources>(
  uniform_buffer_arrays.begin_update();
  // initialize uniform buffer arrays using the first RenderResources
  if let Some((_, first, _, _)) = queries.q0_mut().iter_mut().next() {
- uniform_buffer_arrays.initialize(first, render_resource_context);
+ uniform_buffer_arrays.initialize(None, first, render_resource_context);
  }
 
  for entity in queries.q0().removed::<T>() {
@@ -667,7 +680,7 @@ fn asset_render_resources_node_system<T: RenderResources + Asset>(
 
  uniform_buffer_arrays.begin_update();
  // initialize uniform buffer arrays using the largest RenderResources
- if let Some((asset, _)) = changed_assets
+ if let Some((asset, size)) = changed_assets
  .values()
  .map(|asset| {
  let size: usize = asset
@@ -684,7 +697,7 @@ fn asset_render_resources_node_system<T: RenderResources + Asset>(
  })
  .max_by_key(|(_, size)| *size)
  {
- uniform_buffer_arrays.initialize(asset, render_resource_context);
+ uniform_buffer_arrays.initialize(Some(size), asset, render_resource_context);
  }
 
  for (asset_handle, asset) in changed_assets.iter() {