The toolkit: nodes, modifiers, layout, widgets, input. No engine, no OpenGL, no AWT.

The one renderer every backend draws with: canvas, batch, layers, glyph atlas and the OpenGL device.

The effects the toolkit ships: blur, outline, colour grade, dissolve. Public API only.

The in-play widgets: bars, reticle, hotbar, cooldowns, minimap, damage numbers, particles. Public API only.

Debug tooling for development builds: the inspector, the developer console, and the layout, focus, redraw, overdraw, text and frame budget overlays. Public API only.

The LibGDX backend: a Gdx.gl binding for the shared renderer, FreeType glyphs, input, clipboard, keyboard.

The KorGE backend: a KmlGl binding for the shared renderer, KorGE's TrueType glyphs, clipboard and cursor, inside a KorGE game's own stage.

The raw OpenGL backend: a GLFW window, an LWJGL binding for the shared renderer, and stb_truetype. No engine.

The iOS half of a backend: the parts of a phone no engine reports.

Shared test material: the scenes every backend must draw the same, and golden comparison.

Shared test material: the scenes every backend must draw the same, and golden comparison.