Framework core
Evidence basis: source-verified at the pinned commit. Claims on this page were checked by reading the CNA source at commit 3b43bd86; unless a sentence says otherwise, nothing here was built or executed.
The XNA-shaped core: Game and its lifecycle, services and components, the value types and their exact numeric semantics, geometry, colour and layout.
Pages in this group
- A first CNA game, read line by line — A minimal CNA game and its extension to movement, edge clamping, sound and rectangle collision, explaining each framework contract and where CNA conveniences differ from portable XNA code.
- The Game class: contract, run modes and extension points — Exact semantics of CNA's Game base class: event types, property guards, override points, Run versus RunOneFrame versus Tick, the browser loop, reserved debug keys and the exception boundary.
- GameTime and the timestep: exact clock semantics — What CNA's game clock reports: GameTime protection, fixed-step catch-up with worked numbers, IsRunningSlowly hysteresis versus XNA 4.0, ResetElapsedTime, vsync versus timestep, and the browser clock.
- Exit, Exiting, Dispose and destruction — What each way of ending a CNA game runs: Exit versus Exiting, explicit Dispose versus destruction, the XNA 4.0 disposal order, repeated, re-entrant and throwing disposal, and component lifetimes at shutdown.
- Game components and the service container — Exact contracts of GameComponent, DrawableGameComponent, GameComponentCollection and GameServiceContainer in CNA: ordering, content loading, disposal without unregistration, events, iterators and type-keyed services.
- GameWindow, GraphicsDeviceManager and the supporting types — CNA's single GameWindow facade and its failure policy, GraphicsDeviceManager construction, CreateDevice, ApplyChanges and presentation preferences, and LaunchParameters, TitleContainer, TitleLocation and FrameworkDispatcher.
- Coordinate and composition conventions: handedness, row vectors, depth and clip space — CNA's right-handed basis, row-vector matrices applied in reading order, quaternion products that run the other way, the [0,1] depth range derived three times, clip-space W and the ToColumnMajor bridge.
- Math value types in C++: object layout, equality, hashing and API shape — Which CNA math types carry a vtable, why Color is 24 bytes on 64-bit hosts, the internal vertex stream structs, output-reference aliasing, exact equality, hash and ToString rules, and the System argument exceptions.
- Vector, Matrix and MathHelper numerics: interpolation, clamping and degenerate inputs — What CNA's vector, matrix and MathHelper functions return for out-of-range amounts, inverted clamps, NaN, zero vectors, singular matrices and bad camera input, compared with XNA 4.0, plus the precision and test evidence.
- Planes, rays and bounding volumes: exact containment and intersection semantics — Half-space conventions, plane transforms, ray tolerances, box corner order, sphere and frustum containment rules in CNA, compared function by function with XNA 4.0, with workarounds for every mismatch.
- Rectangle, Point and Color: integer geometry and packed colour semantics — Rectangle's half-open edges, touching and empty rules, Point's missing Vector2 bridge and rounding, Color's AABBGGRR word, the 141/140/139 named-colour counts, construction rounding and premultiplied alpha.
- Curve evaluation: keys, tangents, loop types and the XNA reference — How CNA's Curve evaluates: sorted keys, the per-segment Hermite basis, Step continuity, the five loop types, smooth tangents and degenerate curves, each compared with the XNA 4.0 algorithm.