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use std::collections::{BTreeMap, HashMap};
use anyhow::Result;
use glam::Quat;
use gltf::json::{
accessor::GenericComponentType, buffer::Stride, scene::UnitQuaternion, validation::Checked,
Index,
};
use petgraph::stable_graph::NodeIndex;
use tracing::warn;
use crate::{document::GltfDocument, graph::gltf::buffer_view::Target, io::format::ExportFormat};
use super::GltfFormat;
impl ExportFormat<GltfDocument> for GltfFormat {
fn export(mut doc: GltfDocument) -> Result<Box<GltfFormat>> {
let mut json = gltf::json::root::Root::default();
let mut resources = HashMap::new();
let mut accessor_idxs = BTreeMap::<NodeIndex, u32>::new();
let mut buffer_idxs = BTreeMap::<NodeIndex, u32>::new();
let mut buffer_view_idxs = BTreeMap::<NodeIndex, u32>::new();
let mut mesh_idxs = BTreeMap::<NodeIndex, u32>::new();
let mut node_idxs = BTreeMap::<NodeIndex, u32>::new();
let mut scene_idxs = BTreeMap::<NodeIndex, u32>::new();
let mut uris = BTreeMap::<NodeIndex, String>::new();
// Calculate min/max before exporting buffer blobs
let mut min_max = doc
.accessors()
.iter()
.map(|a| {
let max = a.calc_max(&doc.0).map(|v| v.into());
let min = a.calc_min(&doc.0).map(|v| v.into());
(min, max)
})
.collect::<Vec<_>>();
// Create buffers
json.buffers = doc
.buffers()
.iter_mut()
.enumerate()
.map(|(i, buffer)| {
buffer_idxs.insert(buffer.0, i as u32);
let weight = buffer.get_mut(&mut doc.0);
let name = weight.name.take();
let extras = weight.extras.take();
let byte_length = weight.byte_length.into();
let uri = match weight.uri.take() {
Some(uri) => uri,
None => {
let mut idx = 0;
loop {
let uri = format!("buffer_{}.bin", idx);
if !uris.values().any(|v| v == &uri) {
break uri;
}
idx += 1;
}
}
};
weight
.blob
.take()
.map(|blob| resources.insert(uri.clone(), blob));
uris.insert(buffer.0, uri.clone());
gltf::json::buffer::Buffer {
name,
extras,
extensions: None,
byte_length,
uri: Some(uri),
}
})
.collect::<Vec<_>>();
// Create buffer views
json.buffer_views = doc
.buffer_views()
.iter_mut()
.enumerate()
.filter_map(|(i, view)| {
buffer_view_idxs.insert(view.0, i as u32);
let buffer_idx = match view
.buffer(&doc.0)
.and_then(|buffer| buffer_idxs.get(&buffer.0))
{
Some(idx) => idx,
None => {
warn!("Buffer view has no buffer");
return None;
}
};
let weight = view.get_mut(&mut doc.0);
Some(gltf::json::buffer::View {
name: weight.name.take(),
extras: weight.extras.take(),
extensions: None,
buffer: Index::new(*buffer_idx),
byte_length: weight.byte_length.into(),
byte_offset: Some(weight.byte_offset.into()),
byte_stride: weight.byte_stride.map(Stride),
target: weight
.target
.take()
.map(|t| match t {
Target::ArrayBuffer => gltf::json::buffer::Target::ArrayBuffer,
Target::ElementArrayBuffer => {
gltf::json::buffer::Target::ElementArrayBuffer
}
Target::Unknown(value) => {
warn!("Unknown buffer view target: {}", value);
gltf::json::buffer::Target::ArrayBuffer
}
})
.map(Checked::Valid),
})
})
.collect::<Vec<_>>();
// Create accessors
json.accessors = doc
.accessors()
.iter_mut()
.enumerate()
.filter_map(|(i, a)| {
accessor_idxs.insert(a.0, i as u32);
let buffer_view_idx = match a
.buffer_view(&doc.0)
.and_then(|buffer_view| buffer_view_idxs.get(&buffer_view.0))
{
Some(idx) => idx,
None => {
warn!("Accessor has no buffer view");
return None;
}
};
let max = min_max[i].1.take();
let min = min_max[i].0.take();
let count = a.count(&doc.0)? as u64;
let weight = a.get_mut(&mut doc.0);
Some(gltf::json::accessor::Accessor {
name: weight.name.take(),
extras: weight.extras.take(),
extensions: None,
buffer_view: Some(Index::new(*buffer_view_idx)),
byte_offset: Some(weight.byte_offset.into()),
component_type: Checked::Valid(GenericComponentType(weight.component_type)),
count: count.into(),
max,
min,
normalized: weight.normalized,
sparse: None,
type_: Checked::Valid(weight.element_type),
})
})
.collect::<Vec<_>>();
// TODO: Create materials
// Create meshes
json.meshes = doc
.meshes()
.iter_mut()
.enumerate()
.map(|(i, mesh)| {
mesh_idxs.insert(mesh.0, i as u32);
let primitives = mesh
.primitives(&doc.0)
.iter()
.map(|p| {
let weight = p.get(&doc.0);
let indices = p
.indices(&doc.0)
.and_then(|indices| accessor_idxs.get(&indices.0))
.map(|idx| Index::new(*idx));
let attributes = p
.attributes(&doc.0)
.iter()
.filter_map(|(k, v)| {
accessor_idxs
.get(&v.0)
.map(|idx| (Checked::Valid(k.clone()), Index::new(*idx)))
})
.collect::<BTreeMap<_, _>>();
gltf::json::mesh::Primitive {
attributes,
indices,
material: None,
mode: Checked::Valid(weight.mode),
targets: None,
extensions: None,
extras: None,
}
})
.collect::<Vec<_>>();
let weight = mesh.get_mut(&mut doc.0);
gltf::json::mesh::Mesh {
name: weight.name.take(),
extras: weight.extras.take(),
extensions: None,
weights: if weight.weights.is_empty() {
None
} else {
Some(weight.weights.clone())
},
primitives,
}
})
.collect::<Vec<_>>();
// Create nodes
json.nodes = doc
.nodes()
.iter_mut()
.enumerate()
.map(|(i, node)| {
node_idxs.insert(node.0, i as u32);
let mesh = node
.mesh(&doc.0)
.and_then(|mesh| mesh_idxs.get(&mesh.0))
.map(|idx| Index::new(*idx));
let weight = node.get_mut(&mut doc.0);
gltf::json::scene::Node {
name: weight.name.take(),
extras: weight.extras.take(),
extensions: None,
camera: None,
children: None,
skin: None,
matrix: None,
mesh,
rotation: if weight.rotation == Quat::IDENTITY {
None
} else {
Some(UnitQuaternion(weight.rotation.into()))
},
scale: if weight.scale == glam::Vec3::ONE {
None
} else {
Some(weight.scale.into())
},
translation: if weight.translation == glam::Vec3::ZERO {
None
} else {
Some(weight.translation.into())
},
weights: None,
}
})
.collect::<Vec<_>>();
// Parent nodes
doc.nodes().iter().for_each(|node| {
let children_idxs = node
.children(&doc.0)
.iter()
.filter_map(|child| node_idxs.get(&child.0))
.map(|idx| Index::new(*idx))
.collect::<Vec<_>>();
let idx = node_idxs.get(&node.0).unwrap();
let node = json.nodes.get_mut(*idx as usize).unwrap();
if !children_idxs.is_empty() {
node.children = Some(children_idxs);
};
});
// TODO: Create skins
// Create scenes
json.scenes = doc
.scenes()
.iter_mut()
.enumerate()
.map(|(i, scene)| {
scene_idxs.insert(scene.0, i as u32);
let nodes = scene
.nodes(&doc.0)
.iter()
.filter_map(|node| node_idxs.get(&node.0))
.map(|idx| Index::new(*idx))
.collect::<Vec<_>>();
let weight = scene.get_mut(&mut doc.0);
gltf::json::scene::Scene {
name: weight.name.take(),
extras: weight.extras.take(),
extensions: None,
nodes,
}
})
.collect::<Vec<_>>();
// Default scene
if let Some(scene) = doc.default_scene() {
json.scene = scene_idxs.get(&scene.0).map(|idx| Index::new(*idx));
}
// TODO: Create animations
Ok(Box::new(GltfFormat {
json,
resolver: None,
resources,
}))
}
}