Import Oxide engine (Stages 0–10) under MIT license

Full project snapshot migrated to new Gitea remote without history:
engine, editor, physics, script, examples, tests, docs, and assets.
Relicensed from GPLv3 to MIT and updated repo URLs.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

engine/benches/transform.rs

@@ -0,0 +1,57 @@
+//! Benchmark for transform composition.
+//!
+//! Stage 1 test criterion: 1M transform multiplications must complete under
+//! 10ms. The `compose_1m` benchmark below measures exactly that workload; check
+//! its reported time against the 10ms budget.
+
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use oxide_engine::math::{Quat, Transform, Vec3};
+
+fn compose_1m(c: &mut Criterion) {
+    // A representative non-trivial transform (uniform scale → exact fast path).
+    let a = Transform::from_trs(
+        Vec3::new(1.0, 2.0, 3.0),
+        Quat::from_euler(glam::EulerRot::XYZ, 0.3, 0.5, 0.7),
+        Vec3::splat(1.5),
+    );
+    let b = Transform::from_trs(
+        Vec3::new(-2.0, 0.5, 4.0),
+        Quat::from_rotation_y(0.9),
+        Vec3::splat(0.8),
+    );
+
+    c.bench_function("compose_1m", |bencher| {
+        bencher.iter(|| {
+            // Compose 1M times. Inputs are re-fetched through `black_box` each
+            // iteration so the optimizer can neither hoist the call nor let the
+            // accumulated values blow up to infinity; the product is consumed.
+            let mut acc = Vec3::ZERO;
+            for _ in 0..1_000_000 {
+                let product = black_box(a).mul_transform(&black_box(b));
+                acc += product.translation;
+            }
+            black_box(acc)
+        });
+    });
+}
+
+fn point_transform_1m(c: &mut Criterion) {
+    let t = Transform::from_trs(
+        Vec3::new(1.0, 2.0, 3.0),
+        Quat::from_rotation_z(0.6),
+        Vec3::splat(2.0),
+    );
+    c.bench_function("transform_point_1m", |bencher| {
+        bencher.iter(|| {
+            let mut acc = Vec3::ZERO;
+            for i in 0..1_000_000u32 {
+                let p = Vec3::splat(i as f32 * 1e-6);
+                acc += t.transform_point(black_box(p));
+            }
+            black_box(acc)
+        });
+    });
+}
+
+criterion_group!(benches, compose_1m, point_transform_1m);
+criterion_main!(benches);