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Faster gltf loader (#3165)
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# Objective

- @superdump was having trouble with this loop in the GLTF loader.

## Solution

- Make it probably linear.
- Measured times: 
- Old: 40s, new: 200ms

I'm sure there's still room for improvement. For example, I think making the nodes be in `Arc`s could be a significant gain, since currently there's duplication all the way down the tree.

Co-authored-by: Carter Anderson <[email protected]>
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@DJMcNab @cart
DJMcNab and cart committed Nov 22, 2021
1 parent 65e834c commit 85c37e6
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Showing 3 changed files with 94 additions and 66 deletions.
1 change: 1 addition & 0 deletions pipelined/bevy_gltf2/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ bevy_pbr2 = { path = "../bevy_pbr2", version = "0.5.0" }
bevy_reflect = { path = "../../crates/bevy_reflect", version = "0.5.0", features = ["bevy"] }
bevy_render2 = { path = "../bevy_render2", version = "0.5.0" }
bevy_transform = { path = "../../crates/bevy_transform", version = "0.5.0" }
bevy_utils = { path = "../../crates/bevy_utils", version = "0.5.0" }
bevy_math = { path = "../../crates/bevy_math", version = "0.5.0" }
bevy_scene = { path = "../../crates/bevy_scene", version = "0.5.0" }
bevy_log = { path = "../../crates/bevy_log", version = "0.5.0" }
Expand Down
2 changes: 1 addition & 1 deletion pipelined/bevy_gltf2/src/lib.rs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
use std::collections::HashMap;
use bevy_utils::HashMap;

mod loader;
pub use loader::*;
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157 changes: 92 additions & 65 deletions pipelined/bevy_gltf2/src/loader.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -21,15 +21,13 @@ use bevy_transform::{
hierarchy::{BuildWorldChildren, WorldChildBuilder},
prelude::{GlobalTransform, Transform},
};
use bevy_utils::{HashMap, HashSet};
use gltf::{
mesh::Mode,
texture::{MagFilter, MinFilter, WrappingMode},
Material, Primitive,
};
use std::{
collections::{HashMap, HashSet},
path::Path,
};
use std::{collections::VecDeque, path::Path};
use thiserror::Error;
use wgpu::{AddressMode, FilterMode, PrimitiveTopology, SamplerDescriptor, TextureFormat};

Expand Down Expand Up @@ -83,8 +81,8 @@ async fn load_gltf<'a, 'b>(
let buffer_data = load_buffers(&gltf, load_context, load_context.path()).await?;

let mut materials = vec![];
let mut named_materials = HashMap::new();
let mut linear_textures = HashSet::new();
let mut named_materials = HashMap::default();
let mut linear_textures = HashSet::default();
for material in gltf.materials() {
let handle = load_material(&material, load_context);
if let Some(name) = material.name() {
Expand All @@ -106,7 +104,7 @@ async fn load_gltf<'a, 'b>(
}

let mut meshes = vec![];
let mut named_meshes = HashMap::new();
let mut named_meshes = HashMap::default();
for mesh in gltf.meshes() {
let mut primitives = vec![];
for primitive in mesh.primitives() {
Expand Down Expand Up @@ -195,7 +193,7 @@ async fn load_gltf<'a, 'b>(
}

let mut nodes_intermediate = vec![];
let mut named_nodes_intermediate = HashMap::new();
let mut named_nodes_intermediate = HashMap::default();
for node in gltf.nodes() {
let node_label = node_label(&node);
nodes_intermediate.push((
Expand Down Expand Up @@ -229,7 +227,7 @@ async fn load_gltf<'a, 'b>(
named_nodes_intermediate.insert(name, node.index());
}
}
let nodes = resolve_node_hierarchy(nodes_intermediate)
let nodes = resolve_node_hierarchy(nodes_intermediate, load_context.path())
.into_iter()
.map(|(label, node)| load_context.set_labeled_asset(&label, LoadedAsset::new(node)))
.collect::<Vec<bevy_asset::Handle<GltfNode>>>();
Expand Down Expand Up @@ -275,7 +273,7 @@ async fn load_gltf<'a, 'b>(
});

let mut scenes = vec![];
let mut named_scenes = HashMap::new();
let mut named_scenes = HashMap::default();
for scene in gltf.scenes() {
let mut err = None;
let mut world = World::default();
Expand Down Expand Up @@ -716,42 +714,51 @@ async fn load_buffers(

fn resolve_node_hierarchy(
nodes_intermediate: Vec<(String, GltfNode, Vec<usize>)>,
asset_path: &Path,
) -> Vec<(String, GltfNode)> {
let mut max_steps = nodes_intermediate.len();
let mut nodes_step = nodes_intermediate
let mut has_errored = false;
let mut empty_children = VecDeque::new();
let mut parents = vec![None; nodes_intermediate.len()];
let mut unprocessed_nodes = nodes_intermediate
.into_iter()
.enumerate()
.map(|(i, (label, node, children))| (i, label, node, children))
.collect::<Vec<_>>();
let mut nodes = std::collections::HashMap::<usize, (String, GltfNode)>::new();
while max_steps > 0 && !nodes_step.is_empty() {
if let Some((index, label, node, _)) = nodes_step
.iter()
.find(|(_, _, _, children)| children.is_empty())
.cloned()
{
nodes.insert(index, (label, node));
for (_, _, node, children) in nodes_step.iter_mut() {
if let Some((i, _)) = children
.iter()
.enumerate()
.find(|(_, child_index)| **child_index == index)
{
children.remove(i);

if let Some((_, child_node)) = nodes.get(&index) {
node.children.push(child_node.clone())
}
.map(|(i, (label, node, children))| {
for child in children.iter() {
if let Some(parent) = parents.get_mut(*child) {
*parent = Some(i);
} else if !has_errored {
has_errored = true;
warn!("Unexpected child in GLTF Mesh {}", child);
}
}
nodes_step = nodes_step
.into_iter()
.filter(|(i, _, _, _)| *i != index)
.collect()
let children = children.into_iter().collect::<HashSet<_>>();
if children.is_empty() {
empty_children.push_back(i);
}
(i, (label, node, children))
})
.collect::<HashMap<_, _>>();
let mut nodes = std::collections::HashMap::<usize, (String, GltfNode)>::new();
while let Some(index) = empty_children.pop_front() {
let (label, node, children) = unprocessed_nodes.remove(&index).unwrap();
assert!(children.is_empty());
nodes.insert(index, (label, node));
if let Some(parent_index) = parents[index] {
let (_, parent_node, parent_children) =
unprocessed_nodes.get_mut(&parent_index).unwrap();

assert!(parent_children.remove(&index));
if let Some((_, child_node)) = nodes.get(&index) {
parent_node.children.push(child_node.clone())
}
if parent_children.is_empty() {
empty_children.push_back(parent_index);
}
}
max_steps -= 1;
}

if !unprocessed_nodes.is_empty() {
warn!("GLTF model must be a tree: {:?}", asset_path);
}
let mut nodes_to_sort = nodes.into_iter().collect::<Vec<_>>();
nodes_to_sort.sort_by_key(|(i, _)| *i);
nodes_to_sort
Expand Down Expand Up @@ -799,6 +806,8 @@ impl<'a> DataUri<'a> {

#[cfg(test)]
mod test {
use std::path::PathBuf;

use super::resolve_node_hierarchy;
use crate::GltfNode;

Expand All @@ -813,7 +822,10 @@ mod test {
}
#[test]
fn node_hierarchy_single_node() {
let result = resolve_node_hierarchy(vec![("l1".to_string(), GltfNode::empty(), vec![])]);
let result = resolve_node_hierarchy(
vec![("l1".to_string(), GltfNode::empty(), vec![])],
PathBuf::new().as_path(),
);

assert_eq!(result.len(), 1);
assert_eq!(result[0].0, "l1");
Expand All @@ -822,10 +834,13 @@ mod test {

#[test]
fn node_hierarchy_no_hierarchy() {
let result = resolve_node_hierarchy(vec![
("l1".to_string(), GltfNode::empty(), vec![]),
("l2".to_string(), GltfNode::empty(), vec![]),
]);
let result = resolve_node_hierarchy(
vec![
("l1".to_string(), GltfNode::empty(), vec![]),
("l2".to_string(), GltfNode::empty(), vec![]),
],
PathBuf::new().as_path(),
);

assert_eq!(result.len(), 2);
assert_eq!(result[0].0, "l1");
Expand All @@ -836,10 +851,13 @@ mod test {

#[test]
fn node_hierarchy_simple_hierarchy() {
let result = resolve_node_hierarchy(vec![
("l1".to_string(), GltfNode::empty(), vec![1]),
("l2".to_string(), GltfNode::empty(), vec![]),
]);
let result = resolve_node_hierarchy(
vec![
("l1".to_string(), GltfNode::empty(), vec![1]),
("l2".to_string(), GltfNode::empty(), vec![]),
],
PathBuf::new().as_path(),
);

assert_eq!(result.len(), 2);
assert_eq!(result[0].0, "l1");
Expand All @@ -850,15 +868,18 @@ mod test {

#[test]
fn node_hierarchy_hierarchy() {
let result = resolve_node_hierarchy(vec![
("l1".to_string(), GltfNode::empty(), vec![1]),
("l2".to_string(), GltfNode::empty(), vec![2]),
("l3".to_string(), GltfNode::empty(), vec![3, 4, 5]),
("l4".to_string(), GltfNode::empty(), vec![6]),
("l5".to_string(), GltfNode::empty(), vec![]),
("l6".to_string(), GltfNode::empty(), vec![]),
("l7".to_string(), GltfNode::empty(), vec![]),
]);
let result = resolve_node_hierarchy(
vec![
("l1".to_string(), GltfNode::empty(), vec![1]),
("l2".to_string(), GltfNode::empty(), vec![2]),
("l3".to_string(), GltfNode::empty(), vec![3, 4, 5]),
("l4".to_string(), GltfNode::empty(), vec![6]),
("l5".to_string(), GltfNode::empty(), vec![]),
("l6".to_string(), GltfNode::empty(), vec![]),
("l7".to_string(), GltfNode::empty(), vec![]),
],
PathBuf::new().as_path(),
);

assert_eq!(result.len(), 7);
assert_eq!(result[0].0, "l1");
Expand All @@ -879,20 +900,26 @@ mod test {

#[test]
fn node_hierarchy_cyclic() {
let result = resolve_node_hierarchy(vec![
("l1".to_string(), GltfNode::empty(), vec![1]),
("l2".to_string(), GltfNode::empty(), vec![0]),
]);
let result = resolve_node_hierarchy(
vec![
("l1".to_string(), GltfNode::empty(), vec![1]),
("l2".to_string(), GltfNode::empty(), vec![0]),
],
PathBuf::new().as_path(),
);

assert_eq!(result.len(), 0);
}

#[test]
fn node_hierarchy_missing_node() {
let result = resolve_node_hierarchy(vec![
("l1".to_string(), GltfNode::empty(), vec![2]),
("l2".to_string(), GltfNode::empty(), vec![]),
]);
let result = resolve_node_hierarchy(
vec![
("l1".to_string(), GltfNode::empty(), vec![2]),
("l2".to_string(), GltfNode::empty(), vec![]),
],
PathBuf::new().as_path(),
);

assert_eq!(result.len(), 1);
assert_eq!(result[0].0, "l2");
Expand Down

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