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/*
wearechat - generic multiplayer game with voip
Copyright (C) 2025 metamuffin
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, version 3 of the License only.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
use anyhow::{Result, anyhow};
use gltf::{Gltf, Node, buffer::Data, json::Value};
use log::{debug, info};
use weareshared::{
Affine3A, packets::Resource, resources::CollisionPart, store::ResourceStore, vec3a,
};
pub fn import_physics(
gltf: &Gltf,
trans: Affine3A,
node: &Node,
store: &ResourceStore,
buffers: &[Data],
) -> Result<Vec<(Affine3A, Resource<CollisionPart>)>> {
let mut collision = Vec::new();
if let Some(physics) = node
.extensions()
.and_then(|e| e.get("KHR_physics_rigid_bodies"))
{
debug!("--- COLLISION ---");
if let Some(collider) = physics.get("collider") {
if let Some(geometry) = collider.get("geometry") {
if let Some(&Value::Bool(chull)) = geometry.get("convexHull") {
let node = geometry
.get("node")
.and_then(|n| n.as_u64())
.ok_or(anyhow!("coll geom node missing"))?;
let node = gltf
.nodes()
.nth(node as usize)
.ok_or(anyhow!("coll geom node reference invalid"))?;
let mesh = node.mesh().ok_or(anyhow!("coll geom node has no mesh"))?;
for p in mesh.primitives() {
let reader = p.reader(|buf| Some(&buffers[buf.index()]));
let index = reader
.read_indices()
.ok_or(anyhow!("coll geom no index buffer"))?
.into_u32()
.array_chunks::<3>()
.collect::<Vec<_>>();
let position = reader
.read_positions()
.ok_or(anyhow!("coll geom no positions"))?
.map(|[x, y, z]| vec3a(x, y, z))
.collect::<Vec<_>>();
let mut collpart = CollisionPart {
name: node.name().map(|s| s.to_string()),
..Default::default()
};
if chull {
debug!("convex hull has {} positions", position.len());
collpart.sh_convex_hull = Some(store.set(&position)?);
} else {
debug!(
"mesh has {} indecies and {} positions",
index.len(),
position.len()
);
collpart.sh_mesh = Some((store.set(&index)?, store.set(&position)?));
}
info!("added collision {:?}", node.name().unwrap_or_default());
collision.push((trans, store.set(&collpart)?));
}
}
}
}
}
Ok(collision)
}
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