Use RayMap and RenderLayers in bevy_sprite/picking_backend

[bytemunch]

Objective

Fixes #18005

Utilize RayMap in sprite picking in order to get picking working with differing viewport scaling. Adds RenderLayers to the sprite query for layer-exclusive picking control.

Solution

Small rewrite of the loops in bevy_sprite/picking_backend.rs. Implementing either RayMap or RenderLayers on their own didn't have the correct results, so both solutions are rolled into one PR.

Testing

CI & an updated version of the reproduction repo in the original issue, along with the sprite_picking example.

---

[michalvankodev]

Will this be also ported to 0.15 ?

[bytemunch]

I wouldn't expect so but that's not my call. You can take the code changes and build a custom sprite picking backend that implements the same fixes if you need this to work asap :)

[alice-i-cecile]

I wouldn't expect any further backports to 0.15 at this stage, except maybe for the most serious of problems.

[alice-i-cecile]

This makes sense to me as a fix. I'd prefer more automated tests for this area of the code, but given that we don't have any set up for picking broadly I won't block on this.

This won't work on non-primary windows, which is annoying, but that's a pre-existing bug that should be fixed seperately.

[akimakinai]

Suggested change

	if let Some(cam_render_layers) = cam_render_layers {
	if let Some(layers) = layers {
	if !cam_render_layers.intersects(layers) {
	return None;
	}
	}
	}
	if !cam_render_layers
	.unwrap_or_default()
	.intersects(layers.unwrap_or_default())
	{
	return None;
	}

Entities without RenderLayers are assumed to be RenderLayers::layer(0) (which is the default() value). This is needed to skip cases like camera = None, sprite = Some(RenderLayers::layer(1)) .

Mesh picking backend does this:

bevy/crates/bevy_picking/src/mesh_picking/mod.rs

Line 97 in ea7e868

let cam_layers = cam_layers.to_owned().unwrap_or_default();

bevy/crates/bevy_picking/src/mesh_picking/mod.rs

Lines 106 to 107 in ea7e868

	let entity_layers = layers.get(entity).cloned().unwrap_or_default();
	let render_layers_match = cam_layers.intersects(&entity_layers);

[bloopyboop]

Hi, I would like to adopt this PR (as was recommended to me on bevy's discord). I'm not sure if I've done everything right, but here is my new PR.