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OneCAD/crates/engine/src/cmd/render.rs
T
selune 0e500cacd3 Render: add backend capability discovery and strict request resolution (#650)
Adds render.backends, a metadata-only command that lists the render backends, their executors and profiles, with strict request resolution in the render crate (docs/render-backends.md).
2026-10-13 10:17:41 -04:00

92 lines
4.0 KiB
Rust

//! Render capability discovery. No rendering, host probing or document mutation occurs here.
use serde_json::{Value, json};
use super::CommandSpec;
use crate::params::bad;
use crate::{Result, Session};
pub static COMMANDS: &[CommandSpec] = &[CommandSpec::new("render.backends", "Render Backends", backends)
.noundo()
.doc_only()
.params("No parameters. Returns {schema_version: 1, default_backend: builtin, backends: [{id, label, availability, executors: [{id, availability, profiles, limits, scratch}]}]}. Metadata only; does not start rendering or probe a GPU. See docs/render-backends.md")];
fn backends(_: &mut Session, params: &Value) -> Result<Value> {
if !params.as_object().is_some_and(|p| p.is_empty()) {
return Err(bad("render.backends", "expected an empty parameter object"));
}
Ok(json!({"schema_version": 1, "default_backend": "builtin", "backends": [crate::render::builtin_backend()]}))
}
#[cfg(test)]
mod tests {
use std::sync::Arc;
use super::*;
fn assert_unchanged(s: &mut Session, params: Value) -> Result<Value> {
let doc = s.doc.clone();
let before = (s.is_dirty(), s.revision, s.evaluations, s.model.is_stale());
let camera = s.camera;
let undo = s.undo.clone();
let redo = s.redo.clone();
let result = s.execute("render.backends", &params);
assert!(Arc::ptr_eq(&doc, &s.doc));
assert_eq!(before, (s.is_dirty(), s.revision, s.evaluations, s.model.is_stale()));
assert_eq!(camera, s.camera);
for (before, after) in [(&undo, &s.undo), (&redo, &s.redo)] {
assert_eq!(before.len(), after.len());
for (a, b) in before.iter().zip(after.iter()) {
assert!(Arc::ptr_eq(&a.doc, &b.doc));
assert_eq!((&a.label, a.active_sketch, &a.pending_moves), (&b.label, b.active_sketch, &b.pending_moves));
}
}
result
}
#[test]
fn discovery_preserves_clean_dirty_and_undo_redo_state() {
let mut s = Session::default();
let r = assert_unchanged(&mut s, Value::Null).unwrap();
assert_eq!(r["schema_version"], 1);
assert_eq!(r["default_backend"], "builtin");
assert_eq!(r["backends"].as_array().unwrap().len(), 1);
let descriptor: crate::render::BackendDescriptor = serde_json::from_value(r["backends"][0].clone()).unwrap();
assert_eq!(descriptor, crate::render::builtin_backend());
s.execute("solid.box", &json!({"length": 10, "width": 20, "height": 5})).unwrap();
s.execute("view.apply", &json!({"view": "top"})).unwrap();
assert!(s.is_dirty());
assert_unchanged(&mut s, json!({})).unwrap();
s.execute("edit.undo", &json!({})).unwrap();
assert!(!s.redo.is_empty());
assert_unchanged(&mut s, json!({})).unwrap();
for p in [json!([]), json!(3), json!({"backend": "missing"}), json!({"width": "bad"})] {
assert!(assert_unchanged(&mut s, p).is_err());
}
}
#[test]
fn discovery_does_not_settle_a_live_drag_or_rebuild_geometry() {
let mut s = Session::default();
for (id, p) in [
("sketch.create", json!({"plane": "XY"})),
("sketch.rectangle.two_point", json!({"p0": [5, 5], "p1": [25, 20]})),
("sketch.dimension", json!({"entities": ["l1"], "value": 20})),
("sketch.dimension", json!({"entities": ["l2"], "value": 15})),
("sketch.finish", json!({})),
("solid.extrude", json!({"distance": 5})),
("sketch.edit", json!({"sketch": "Sketch1"})),
("sketch.drag", json!({"entity": "l1.start", "from": [5, 5], "to": [4, 5], "live": true})),
] {
s.execute(id, &p).unwrap();
}
assert!(s.model.is_stale());
s.evaluations = 0;
let model = s.model.state();
assert_unchanged(&mut s, json!({})).unwrap();
assert_unchanged(&mut s, json!({"unexpected": true})).unwrap_err();
assert!(Arc::ptr_eq(&model, &s.model.state()));
assert_eq!(s.evaluations, 0);
}
}