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//! GPU compute infrastructure for `indicatrix` (behind the `gpu` feature).
//!
//! Adapter/device acquisition, a minimal compute-pipeline harness, buffer
//! upload/readback helpers, and the struct-layout/RNG/self-determinism
//! self-tests any physics port must pass before its output can be trusted --
//! plus [`frame`], a REAL, production GPU port of
//! `optics::raytracer::trace_spectral_ray` (the `transport_main` megakernel
//! and the `Wavefront` pipeline alternative) that
//! `renderer::gpu_backend::GpuBackend` dispatches scenes through today.
//!
//! # Modules
//!
//! - [`context`]: adapter/device acquisition ([`GpuContext`]).
//! - [`compute`]: generic compute-pipeline/buffer helpers.
//! - [`layout_check`]: struct-layout GPU echo test.
//! - [`rng_check`]: RNG/integer bit-exactness test against the CPU.
//! - [`determinism_check`]: GPU self-determinism test.
//!
//! `examples/gpu_equivalence_harness.rs` (gated on `gpu`, needs a real
//! adapter so it isn't a `cargo test` target) runs every self-test in this
//! module and its siblings (`camera_check`/`environment_check`/`furnace_check`/
//! `polyhedron_check`/`estimator_check`/`transport_check`/`shading_normal_check`,
//! plus [`frame`]'s own chunk/wavefront/specialisation equivalence checks).
// Geometry/environment self-tests against analytic truth: camera rays, the
// `intersect_polyhedron` slab test, studio environment sampling, CIE 1931 CMF
// integration, von Kries white balance. No transport physics.
pub
// Full isotropic spectral estimator self-test (Fresnel/TIR, Stokes-Mueller
// transport, pleochroic Beer-Lambert absorption, Russian roulette, spectral
// MIS) -- cubic materials only; birefringence not covered here.
// Welford/z-score/connected-component statistics and the pass criteria shared by
// `estimator_check`'s Tier 3 image comparisons and `merge_tests`.
pub
// Self-test for `shading_normal_near_edge`; kept separate (own `planes`
// binding) from `transport_check`/`transport_functions.wgsl`.
// Not a self-test: renders an arbitrary scene with the megakernel every
// module above verifies, via the dispatch routine `estimator_check` uses.
// `shader_validation_tests` used to live here, but that put it behind this module's
// own `#[cfg(feature = "gpu")]` gate even though it needs no GPU adapter (`naga` is an
// unconditional dev-dependency) -- see `renderer::shader_validation_tests`, declared
// in `renderer/mod.rs` outside the gate, with `#[path]` pointing back at the same file.
// CPU+GPU hybrid rendering: GPU and every CPU core trace disjoint sample
// ranges of one frame concurrently, merging into one image.
//
// Excluded on wasm32: `std::thread::scope` needs real OS threads, and the
// `webgpu` backend's `wgpu::Device` holds `Rc`-based handles that aren't
// `Send` -- a hard compile error there regardless. `apps/indicatrix-web`
// never calls this module.
// Cross-backend merge tests (CPU and GPU over disjoint sample ranges, merged by summed
// buffers and summed counts) -- see the module's own doc comment.
// Before/after identity pin on `hybrid::cpu_accumulate` -- see the module's
// own doc comment for why it exists and what it guards.
pub use ;
pub use ;