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Native C++/Vulkan GPU workbench for procedural graphics experiments.

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# cubey

Cubey is a native desktop GPU workbench for procedural graphics experiments and
projects. The goal is a small, deliberate C++/Vulkan foundation that keeps
engine, host, resource, input, camera, transform, and project boundaries explicit
while leaving the interesting work in shaders, compute, and project code.

Cubey is not a generic game engine, editor, SDK, or backend-agnostic renderer.
It should still use established graphics terminology and proven public
precedent when shaping new foundation contracts.

Active development lives on `main`. The original OpenGL 4 shader playground is
preserved on the `legacy` branch.

## Current Direction

- Primary target: native Vulkan on desktop.
- Primary library: layered `cubey::*` targets with public headers under
  `include/cubey/` and an aggregate `cubey::cubey` target for examples and
  projects.
- Optional host layer: `cubey_host`, for GLFW-backed window hosting.
- Runnable targets live under `examples/` or `projects/`; examples are
  intentionally cube-focused renderer demos, while richer/non-cube work lives
  under `projects/`.
- Headless PNG and optional MP4 output are first-class verification/capture
  paths for projects that can render without a window.
- Runtime debug UI uses ImGui where projects need live controls; Cubey still
  does not aim to become an editor.

Current examples:

- `spinning_cube`: primitive cube mesh with shared transform/camera math and depth.
- `textured_cube`: primitive cube mesh, compute-generated texture, descriptors,
  scene lighting, and input.
- `shadow_cube`: primitive cube/plane meshes, graph-declared directional shadow
  map, transient scene color target, and fullscreen triangle present pass.
- `instanced_cubes`: real instance-rate vertex input with one cube mesh and many
  cube instances.
- `material_cubes`: multiple material handles and material instances bound per
  scene draw packet.
- `headless_cube`: no-window offscreen cube PNG/MP4 capture path.
- `particle_cubes`: compute-updated cube particles rendered as indexed cube
  instances.

Current active projects:

- `atmosphere`: clear-sky scattering workbench with solar time of day, twilight,
  procedural stars, moon rendering, Milky Way atlas layers, the shared
  production cloud layer, and headless output.
- `planet`: orbital-only Earth-like globe product with deterministic cached
  surface fields, shared sky/celestial composition, phase presets, and
  headless visual review coverage. Surface-scale terrain and planet LOD remain
  explicitly out of scope.
- `terrain`: external-raster far-backdrop product with deterministic selected
  and raw placement, continuous cached sector geometry, shared
  atmosphere/cloud lighting, terrain self-shadowing, procedural material
  detail, runtime replacement, and headless review coverage.
- `ocean`: active ocean renderer derived from the GodotOceanWaves
  spectrum/FFT/unpack core, with Calm/Windy/Stormy presets, configurable
  cascade slots, persistent whitecaps, camera-relative clipmap LOD, curved
  local horizon mapping, shared atmosphere/cloud lighting, planar cloud
  reflection with cached fallback, and terrain-field hooks.
- `smoke_2d`: compute-updated dye/velocity field with MacCormack advection,
  vorticity, pressure projection, debug views, and
  deterministic headless capture output.
- `water_2d`: 2D APIC free-surface liquid with a PIC/FLIP fallback,
  particle-grid transfers, MAC-grid pressure projection, reset presets,
  hose/drain material flow, obstacle shapes, surface/foam debug views, live
  frame/memory diagnostics, and deterministic headless capture output.
- `water_3d`: 3D APIC free-surface liquid in a long showcase tank, with stable
  particle-grid transfer ranges, screen-space water surface rendering, rain,
  hose/drain/wave controls, whitewater, shared procedural atmosphere/cloud
  composition and reflection, profiling diagnostics, and headless capture
  output.
- `fire_3d`: dense volumetric pyro fire demo with 3D storage textures,
  MacCormack advection, combustion, projection, vorticity confinement,
  raymarching, shared procedural environment lighting, orbit camera controls,
  debug views, and headless capture output.
- `explosion_3d`: the same shared 3D pyro solver presented as repeated impulse
  bursts with explosion-specific timing, boost controls, and shared environment
  lighting.
- `fractal_2d`: fullscreen Mandelbrot-style shader with windowed navigation and
  headless output.
- `gltf_viewer`: glTF/glb viewer for imported assets, PBR materials, texture
  upload, rigid/morph/skinned animation, generated or HDR-backed IBL, shared
  atmosphere/cloud composition, optional raster terrain backdrop, shadow maps,
  and headless capture.
- `pbr_furnace`: white-furnace PBR validation scene for roughness/metallic
  behavior under uniform generated IBL.

Paused studies and design-only projects:

- `studies/terrain/hydrology`: opt-in snapshot of the previous regional terrain
  product, routing, and analytical landscape-evolution work; paused while the
  active raster backdrop remains focused on rendering and composition.
- `fluid_25d`: design-only shallow-water direction for terrain-bound rivers,
  flooding, sources, and sinks.

Reference studies and legacy projects:

- `cloud_ref`: TerrainEngine-style local surface cloud reference used to check
  density, sampling, and lighting before promotion into the shared cloud layer.
- `cloud_ref_2`: Godot-v2-style cached-sky architecture reference used to
  inspect octahedral cache behavior, not a visual target.
- `studies/terrain/reference`: frozen terrain reference renderer used to compare
  TerrainEngine and ShaderToy-derived terrain cues.
- `studies/terrain/shadertoy`: restricted-source fidelity study used to compare
  original raymarched references with mesh transfer.
- `clouds_legacy`: frozen first-pass planet-aware cloud/weather prototype kept
  as evidence for scale, horizon, UI, and integration failure modes.

The retired terrain workbench, terrain lab, and coastal demo are summarized in
[Archived terrain attempts](docs/archive/terrain/legacy-attempts.md); Git history
remains their implementation archive.

## Documentation

Start with the [docs index](docs/README.md).

Authoritative current docs:

- [Design](docs/DESIGN.md)
- [Roadmap](docs/roadmap.md)
- [Architecture notes](docs/architecture/README.md)
- [Vulkan abstraction map](docs/architecture/vulkan-abstractions.md)
- [Renderer foundation](docs/architecture/renderer-foundation.md)
- [Reference-first rendering feature workflow](docs/architecture/rendering-feature-workflow.md)
- [PBR and IBL direction](docs/architecture/pbr-ibl.md)
- [Render graph direction](docs/architecture/render-graph.md)
- [Entity and component foundation](docs/architecture/entity-component-foundation.md)
- [Host and engine](docs/architecture/host-engine.md)
- [Threading and async](docs/architecture/threading-and-async.md)
- [Procedural generation foundation](docs/architecture/procedural-generation.md)
- [glTF assets and PBR](docs/architecture/gltf-assets.md)
- [Animation and deformation](docs/architecture/animation-deformation.md)
- [Fluid simulation direction](docs/architecture/fluid-simulation.md)
- [Ocean rendering](docs/architecture/ocean-rendering.md)
- [Ocean horizon and curved-local scale](docs/architecture/ocean-horizon-and-planet-scale.md)
- [Planet rendering](docs/architecture/planet-rendering.md)
- [Ocean adjacent systems](docs/architecture/ocean-adjacent-systems.md)
- [C++ style guide](docs/cpp-style.md)
- [Changelog / release notes](CHANGELOG.md)

Project-local docs:

- [Atmosphere](projects/atmosphere/README.md)
- [Cloud Ref](projects/cloud_ref/README.md)
- [Cloud Ref 2](projects/cloud_ref_2/README.md)
- [Clouds Legacy](projects/clouds_legacy/README.md)
- [Fluid overview](projects/fluid/README.md)
- [Smoke 2D](projects/fluid/smoke_2d/README.md)
- [Water 2D](projects/fluid/water_2d/README.md)
- [Water 3D](projects/fluid/water_3d/README.md)
- [Fluid 2.5D design](projects/fluid_25d/README.md)
- [Fire 3D](projects/fluid/fire_3d/README.md)
- [Explosion 3D](projects/fluid/explosion_3d/README.md)
- [Planet](projects/planet/README.md)
- [Terrain](projects/terrain/README.md)
- [Terrain Hydrology Lab](studies/terrain/hydrology/README.md)
- [Terrain Ref](studies/terrain/reference/README.md)
- [Terrain ShaderToy Study](studies/terrain/shadertoy/README.md)
- [Archived Terrain Attempts](docs/archive/terrain/legacy-attempts.md)
- [Ocean](projects/ocean/README.md)

## Development Setup

Cubey needs a native C++20 toolchain plus system Vulkan development packages.
CMake fetches several project dependencies when needed, but it does not provide
the Vulkan SDK/loader, GPU driver, compiler toolchain, or shader compiler.

Required system dependencies:

- C++20 compiler and standard build tools.
- CMake, Ninja, and Git.
- Vulkan headers.
- Vulkan loader / ICD loader (`libvulkan.so` on Linux).
- A Vulkan-capable GPU driver / ICD for your hardware.
- `glslangValidator` for build-time GLSL to SPIR-V shader compilation.

Package names vary by distro. Examples:

```bash
# Arch Linux
sudo pacman -S --needed base-devel cmake ninja git vulkan-headers vulkan-icd-loader vulkan-tools glslang
# Also install one Vulkan driver package for your GPU, such as vulkan-radeon,
# vulkan-intel, amdvlk, or the NVIDIA driver stack.
# Optional for MP4 capture: sudo pacman -S --needed pkgconf ffmpeg

# Ubuntu / Debian
sudo apt install build-essential cmake ninja-build git libvulkan-dev vulkan-tools glslang-tools
# Also install the Vulkan driver package for your GPU, such as
# mesa-vulkan-drivers or the vendor driver stack.
# Optional for MP4 capture: sudo apt install pkg-config libavcodec-dev libavformat-dev libavutil-dev libswscale-dev

# Fedora
sudo dnf install gcc-c++ cmake ninja-build git vulkan-headers vulkan-loader-devel vulkan-tools glslang
# Also install the Vulkan driver package for your GPU, such as
# mesa-vulkan-drivers or the vendor driver stack.
# Optional for MP4 capture: install pkgconf-pkg-config and FFmpeg/libav
# development packages from your enabled repositories.
```

Optional but useful:

- Vulkan validation layers for local smoke runs with `--require-validation`.
- `pkg-config` plus FFmpeg/libav development packages for in-process H.264 MP4
  capture. CMake controls this with `CUBEY_VIDEO_CAPTURE=AUTO|ON|OFF`; `AUTO`
  enables it when `libavcodec`, `libavformat`, `libavutil`, and `libswscale`
  are found.

Use the CMake presets as the default entrypoint:

```bash
cmake --preset dev
cmake --build --preset dev
ctest --preset dev
```

The default test preset excludes all windowed smoke tests. Headless PNG and
video smokes run with desktop-session environment variables removed and require
the offscreen host to report a successful capture. This keeps ordinary local
and SSH validation independent of SDDM, X11, and Wayland sessions while still
requiring an accessible Vulkan device.

Run the GLFW/swapchain smoke suite only when opening windows is intentional:

```bash
ctest --preset dev-windowed
```

Windowed tests also require `CUBEY_ALLOW_WINDOWED_TESTS=1` at execution time, so
a raw `ctest --test-dir build/dev` safely skips them. Directly launching an
application without `--headless` remains interactive.

GLFW, cgltf, stb, Basis Universal, and GLM fallback sources are resolved by
CMake through `FetchContent` or `find_package` where appropriate; they are not
the system packages that make Vulkan itself available.

Optional sample assets can be fetched at configure time:

```bash
cmake --preset dev -DCUBEY_FETCH_GLTF_SAMPLE_ASSETS=ON -DCUBEY_FETCH_HDR_SAMPLE_ASSETS=ON
```

Useful windowed smokes:

```bash
./build/dev/examples/spinning_cube/spinning_cube --frames 300 --width 1280 --height 720
./build/dev/examples/textured_cube/textured_cube --frames 300 --width 1280 --height 720
./build/dev/examples/shadow_cube/shadow_cube --frames 300 --width 1280 --height 720
./build/dev/examples/instanced_cubes/instanced_cubes --frames 300 --width 1280 --height 720
./build/dev/examples/material_cubes/material_cubes --frames 300 --width 1280 --height 720
./build/dev/examples/material_cubes/material_cubes --debug-view normal --frames 300 --width 1280 --height 720
./build/dev/examples/particle_cubes/particle_cubes --frames 300 --width 1280 --height 720
./build/dev/projects/fractal_2d/fractal_2d --frames 300 --width 1280 --height 720
./build/dev/projects/fluid/smoke_2d/smoke_2d --frames 300 --width 1280 --height 720
./build/dev/projects/fluid/water_2d/water_2d --frames 300 --width 1280 --height 720
./build/dev/projects/fluid/water_3d/water_3d --frames 300 --width 1280 --height 720
./build/dev/projects/fluid/fire_3d/fire_3d --frames 300 --width 1280 --height 720
./build/dev/projects/fluid/explosion_3d/explosion_3d --frames 300 --width 1280 --height 720
./build/dev/projects/atmosphere/atmosphere --frames 300 --width 1280 --height 720
./build/dev/projects/planet/planet --frames 300 --width 1280 --height 720
./build/dev/projects/ocean/ocean --ocean-map-size 128 --frames 300 --width 1280 --height 720
./build/dev/projects/gltf_viewer/gltf_viewer --input path/to/model.glb --environment path/to/env.hdr --animation-index 0 --animation-speed 1.0 --frames 300 --width 1280 --height 720
./build/dev/projects/gltf_viewer/gltf_viewer --input path/to/model.glb --debug-view roughness --frames 300 --width 1280 --height 720
./build/dev/projects/gltf_viewer/gltf_viewer --input path/to/model.glb --terrain-heightfield path/to/heightfield --terrain-foreground-height 200 --pbr-environment-source atmosphere --frames 300 --width 1280 --height 720
./build/dev/projects/pbr_furnace/pbr_furnace --frames 300 --width 1280 --height 720
```

Windowed `--frames` runs print a final `windowed_perf` FPS/frame-time summary.
Use `--print-frame-stats` for periodic stdout samples while a window remains
open; the window title also shows the latest sampled FPS and frame time.
Shared run options can also be loaded from JSON config files:

```bash
./build/dev/projects/ocean/ocean --config ocean.json --set ocean.map_size=512
./build/dev/projects/atmosphere/atmosphere --write-config-template atmosphere-template.json
```

Config precedence is defaults, `--config`, named CLI flags, then `--set
path=value`. Config descriptors carry stable paths, labels, groups, value
ranges, enum choices, and help text for config templates, generic `--set`
overrides, and descriptor-backed named CLI flags. Runtime ImGui panels are still
hand-authored project surfaces, but active projects use shared group/control
helpers so hover help and hierarchy stay visually consistent.
`smoke_2d` defaults to a `1024x1024` solver grid and five procedural
injectors; use `--grid-width`, `--grid-height`, and `--smoke-injectors 1..16` to
compare other simulation/demo shapes. Use `--smoke-pressure-solver jacobi|rbgs`
to compare the Jacobi and red-black Gauss-Seidel pressure paths;
`--profile-diagnostics` is available in headless smoke runs when paired with
`--profile-output`.
`water_2d` defaults to a `256x144` MAC grid with APIC particle-grid transfer and
a PIC/FLIP fallback. It uses particles for liquid motion and a face-centered
grid for pressure, so it is intentionally a different solver family from
`smoke_2d`. Runtime UI controls cover reset presets, transfer mode, fill volume,
hose emission, bottom drain, obstacle shape, substeps, pressure iterations,
PIC/FLIP blend, collision damping, particle separation, surface/foam shading,
and Water2D frame/memory diagnostics.
`water_3d` defaults to a `128x64x48` long-tank APIC liquid scene. It keeps
particle storage stable and builds sorted particle-index ranges for transfer,
then renders the default view through a screen-space surface path with
refraction, absorption, environment reflection, foam, and secondary whitewater.
By default it uses the shared procedural atmosphere as its sky/reflection/
lighting source. Surface clouds are composed before the refractive water pass
and also feed the filtered environment reflection. Use `--no-clouds` for the
clear procedural path; `--pbr-environment-source static` keeps the older static
IBL fallback and skips procedural clouds.
Use `--water3d-transfer apic|pic-flip`, `--water3d-transfer-limit N`,
`--water3d-p2g-mode active|tiled`, `--water3d-hose`, `--water3d-drain`,
`--water3d-rain`, `--water3d-wave`, `--water3d-whitewater`, and
`--profile-diagnostics` for focused solver/render profiling.
`fire_3d` and `explosion_3d` share the `pyro_3d` dense solver core. They default
to a `128x128x128` solver volume with a decoupled `64x64x64` shadow volume.
Their raymarch and shadow paths use the shared procedural atmosphere for dynamic
light direction, color, sky tint, and exposure by default; pass
`--pbr-environment-source static` for the legacy fixed-light fallback. Use
`--grid-width`, `--grid-height`, `--grid-depth`, `--shadow-grid-width`,
`--shadow-grid-height`, `--shadow-grid-depth`, `--shadow-steps`,
`--shadow-update-interval`, `--pyro-sources`, `--pyro-source-radius`,
`--pyro-source-force`, `--pyro-soot`, `--pyro-temperature`, `--pyro-fuel`,
`--pyro-buoyancy`, `--pyro-ignition-temperature`, `--pyro-burn-rate`,
`--pyro-heat-output`, `--pyro-soot-yield`, `--pyro-expansion`,
`--pyro-flame-cooling`, `--pyro-shredding`, `--pyro-turbulence`,
`--pyro-obstacle-height`, and `--pyro-obstacle-radius` for lower-cost smoke
tests or heavier local runs. `explosion_3d` also accepts `--explosion-interval`,
`--explosion-duration`, and `--explosion-boost`.
`--print-frame-stats` also emits periodic `pyro_3d_gpu` pass timings when
timestamp queries are available.
`ocean` is a rendering-focused water project rather than a CFD solver. It now
starts from the GodotOceanWaves-derived spectrum/FFT/unpack path and exposes
`--ocean-map-size 128|256|512|1024`,
`--debug-view final|height|displacement|normal|foam|foam-source|foam-history|lod|footprint|energy-lod|far-field|cloud-shadow|cloud-reflection|cloud-reflection-validity|sky-radiance|reflection|specular|direct-light|ambient-light|exposure|terrain-depth|terrain-shore|terrain-slope|curvature`,
and `--ocean-cascade all|0|1|2|3|4` for focused inspection. Use
`--ocean-wire-overlay`, `--ocean-wire-opacity 0.0..1.0`,
`--ocean-spectral-domains`, `--no-ocean-spectral-domains`,
`--ocean-terrain-fields`, and `--no-ocean-terrain-fields` for captured
diagnostics. The GUI groups wave fields, surface material, lighting, scale/LOD,
shared environment, and diagnostics; each cascade owns its workload and wave
parameters. Final view composites the shared surface cloud layer over the
atmosphere sky, projects cloud shadows onto the local ocean, and uses planar
cloud reflection with a cached environment fallback. Use `--no-clouds` for the
clear-sky path. The canonical visual matrix is
`projects/ocean/capture_ocean_review.sh`.
The old `ocean_ref` and `ocean_legacy` projects were retired after their useful
comparison and donor work landed in `ocean`; use git history if a deleted
implementation detail is needed for archaeology.
The removed coastal terrain demo established the terrain-ocean field vocabulary
preserved in
[Terrain-ocean field contract](docs/archive/terrain/terrain-ocean-field-contract.md).

Useful headless PNG smokes:

```bash
./build/dev/examples/headless_cube/headless_cube --width 640 --height 360 --output /tmp/cubey-headless-cube.png
./build/dev/projects/fractal_2d/fractal_2d --headless --width 640 --height 360 --output /tmp/cubey-fractal-2d.png
./build/dev/projects/fluid/smoke_2d/smoke_2d --headless --frames 120 --width 640 --height 360 --output /tmp/cubey-smoke-2d.png
./build/dev/projects/fluid/water_2d/water_2d --headless --frames 120 --width 640 --height 360 --output /tmp/cubey-water-2d.png
./build/dev/projects/fluid/water_3d/water_3d --headless --frames 120 --width 640 --height 360 --output /tmp/cubey-water-3d.png
./build/dev/projects/fluid/fire_3d/fire_3d --headless --frames 120 --width 640 --height 360 --output /tmp/cubey-fire-3d.png
./build/dev/projects/fluid/explosion_3d/explosion_3d --headless --frames 120 --width 640 --height 360 --output /tmp/cubey-explosion-3d.png
./build/dev/projects/atmosphere/atmosphere --headless --frames 120 --width 640 --height 360 --output /tmp/cubey-atmosphere.png
./build/dev/projects/planet/planet --headless --frames 120 --width 640 --height 360 --output /tmp/cubey-planet.png
./build/dev/projects/ocean/ocean --headless --frames 120 --width 640 --height 360 --ocean-map-size 128 --output /tmp/cubey-ocean.png
./build/dev/projects/pbr_furnace/pbr_furnace --headless --width 640 --height 360 --output /tmp/cubey-pbr-furnace.png
```

Useful headless video captures when FFmpeg/libav support is enabled:

```bash
./build/dev/examples/headless_cube/headless_cube --headless --capture video --frames 180 --fps 60 --width 1280 --height 720 --output /tmp/cubey-headless-cube.mp4
./build/dev/projects/gltf_viewer/gltf_viewer --headless --capture video --frames 180 --fps 60 --input path/to/model.glb --environment path/to/env.hdr --output /tmp/cubey-gltf-viewer.mp4
./build/dev/projects/fluid/smoke_2d/smoke_2d --headless --capture video --frames 180 --fps 60 --width 1280 --height 720 --output /tmp/cubey-smoke-2d.mp4
./build/dev/projects/fluid/water_2d/water_2d --headless --capture video --frames 180 --fps 60 --width 1280 --height 720 --output /tmp/cubey-water-2d.mp4
./build/dev/projects/fluid/water_3d/water_3d --headless --capture video --frames 180 --fps 60 --width 1280 --height 720 --output /tmp/cubey-water-3d.mp4
./build/dev/projects/fluid/fire_3d/fire_3d --headless --capture video --frames 180 --fps 60 --width 1280 --height 720 --output /tmp/cubey-fire-3d.mp4
./build/dev/projects/fluid/explosion_3d/explosion_3d --headless --capture video --frames 180 --fps 60 --width 1280 --height 720 --output /tmp/cubey-explosion-3d.mp4
./build/dev/projects/planet/planet --headless --capture video --frames 900 --fps 30 --width 1280 --height 720 --planet-camera-mode orbit --planet-view terminator --planet-disk-coverage 0.48 --output /tmp/cubey-planet-orbit.mp4
./build/dev/projects/ocean/ocean --headless --capture video --frames 180 --fps 60 --width 1280 --height 720 --ocean-map-size 128 --output /tmp/cubey-ocean.mp4
```

Use `--require-validation` on local smoke commands when Vulkan validation
layers are installed.

## Controls

- `textured_cube`: left-drag orbits the camera, Space pauses/resumes
  auto-orbit, `R` resets the camera, Escape closes.
- `shadow_cube`: left-drag orbits the camera, `R` resets the camera, Escape
  closes.
- `instanced_cubes`: left-drag orbits the camera, `R` resets the camera, Escape
  closes.
- `material_cubes`: left-drag orbits the camera, `R` resets the camera, `D`
  cycles PBR debug views, Escape closes.
- `particle_cubes`: left-drag orbits the camera, Space pauses/resumes compute
  updates, `R` resets the camera and cube field, Escape closes.
- `fractal_2d`: left-drag pans, mouse wheel zooms around the cursor, `R` resets,
  Escape closes.
- `smoke_2d`: Space pauses/resumes, `R` resets, `D` cycles
  dye/velocity/divergence/pressure/speed/vorticity views, Escape
  closes.
- `water_2d`: Space pauses/resumes, `R` resets, `D` cycles
  surface/particles/cells/velocity/divergence/pressure/solid/foam views, Escape
  closes.
- `water_3d`: left-drag orbits the camera, mouse wheel zooms, Space
  pauses/resumes, `R` resets, `D` cycles surface/particles/cells/velocity/
  pressure/solid/overpack/surface diagnostic/whitewater views, Escape closes.
- `fire_3d` / `explosion_3d`: left-drag orbits the camera, mouse wheel zooms,
  Space pauses/resumes, `R` resets, `D` cycles smoke/density/velocity views,
  Escape closes.
- `gltf_viewer`: left-drag orbits the camera, `D` cycles PBR debug views,
  Escape closes.
- `ocean`: left-drag orbits the camera, mouse wheel
  zooms, Space pauses/resumes wave time, `R` resets, `D` cycles wave-core debug
  views, Escape closes.
- `planet`: left-drag orbits the planet, mouse wheel changes disk distance,
  `R` resets the orbit, and Escape closes. Surface mode is intentionally not
  part of orbital V1.
- `pbr_furnace`: left-drag orbits the camera, Escape closes.

`--debug-view` currently accepts `final`, `base-color`, `normal`,
`geometric-normal`, `roughness`, `metallic`, `occlusion`, `emissive`, `shadow`,
`alpha`, and `uv0` on the shared forward-PBR path.

## License

Cubey is licensed under the [MIT License](LICENSE).

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