UI_PASS constant is not public

[glfmn]

Version
Bevy	0.4
OS	Ubuntu 20.04.1

Context

I'm working on a plugin which adds an immediate mode drawing context for debugging purposes with simple shapes, arrows, etc, to avoid needing to spawn and manage entities.

I have implemented this functionality in a render node which I have running after the main pass, taking as input the color texture and the depth texture.

Discord.

The problem

My render pass is randomly missing depth information from the main pass. I noticed a render pass which has no draw calls but which clears the depth texture seems to be the culprit. Sometimes it runs in the same color pass as, but after, my debug node and things look fine. Sometimes it appears as a separate color pass that happens before my render pass. Where does this render pass come from? Am I missing a node I need to add a dependency on?

Frame	Capture	Description
		The blue and green cubes appear as desired, and the depth texture from the main pass is cleared immediately after my draw calls.
		The blue and green cubes appear superimposed, and the depth texture from the main pass seems to have been cleared by Color Pass 2 (which is in-between the main pass and my debug pass)

Render Graph Setup

From bevy_debug_draw/src/renderer.rs:312

use bevy_render::render_graph::base;
render_graph.add_node(node::DEBUG_DRAW, DebugDrawNode::new());
render_graph
    .add_slot_edge(
        base::node::PRIMARY_SWAP_CHAIN,
        WindowSwapChainNode::OUT_TEXTURE,
        node::DEBUG_DRAW,
        DebugDrawNode::COLOR_ATTACHMENT_SLOT,
    )
    .expect("Failed to link node to color output");

render_graph
    .add_slot_edge(
        base::node::MAIN_DEPTH_TEXTURE,
        WindowTextureNode::OUT_TEXTURE,
        node::DEBUG_DRAW,
        DebugDrawNode::DEPTH_ATTACHMENT_SLOT,
    )
    .expect("Failed to link node to depth texture");

render_graph
    .add_node_edge(base::node::MAIN_PASS, node::DEBUG_DRAW)
    .expect("Failed to schedule debug node after main pass");

Pass descriptor is found here. Pipeline descriptor is found here.

[glfmn]

I took another look through the base render graph but I don't see anything other than the main pass node which actually creates a render pass. I have updated to bevy master and the issue persists roughly as before.

[glfmn]

I think it was the UI_PASS which also runs after main pass.

Adding render_graph.add_node_edge(node::DEBUG_DRAW, "ui_pass") seems to have solved the issue.

However, on master I was unable to find the actual UI_PASS constant. It seems like it should be exported from bevy_ui but I don't see it anywhere when I use cargo doc --open and I can't get my program to compile using what it seems should be the path to the node module.

[james7132]

It does seem to be public as of #3312. Does that resolve this issue?

[glfmn]

I am indeed able to see UI_PASS in docs.rs