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Racing Milestone 5 — drivable car and desktop controls

Result

Milestone 5 completed on 2026-09-03. RacingGame_cna_samples is the first runnable product target: exact car/player/camera logic drives a real generated track and renders the authentic XNA 4 car, road, landscape and sky through OPENGL33. No GLB, glTF, loose asset conversion, alternate shader or sample-local runtime workaround is present.

Frozen revisions

  • CNA: aa27e6a6a61fb296403950fa66cec96b5d058562
  • cna-samples starting revision: c25c045ff99e8ecbea54b5e030e60a34ad1c41b9
  • sharp-runtime: 6baf0925e0bf7805a363836deed90543d26f6d28
  • renderer/profile: CNA OPENGL33, HiDef, Mesa OpenGL 4.5 core

Product integration

The concrete RacingGameManager owns the GraphicsDeviceManager, content, static scene, player, car renderer, desktop control source, camera matrix, checkpoint and replay state, default highscore table and pending UI/audio events. Physics calls the actual Track for segment localization and coordinate frames. The desktop provider preserves the original keyboard/mouse/gamepad mapping, mouse half-delta smoothing, wheel delta and active in-race cursor recentering.

CarRenderer uses Models/Car.xnb and Textures/RacerCar.xnb from the unchanged XNA Game Studio build. It preserves processor-selected techniques, embedded normal and cube textures, original ambient/diffuse parameters, absolute bones, wheel signs and solid-then-reflection/glass pass order. All 12 mesh parts are submitted.

Track now computes the original 500m checkpoint segment list. FNA and CNA agree:

TrackBeginner: 197,398,585,783,975,1172
TrackAdvanced: 197,395,588,787,984,1178,1376,1621,1812,2007
TrackExpert:   198,395,591,788,984,1196,1390,1584,1781,1974,2169,
               2366,2627,2821,3017,3214,3411,3607,3802,3995,4192

Regression evidence

The scene probe supplies an accelerating logical control source while exercising the same game, player, renderer and public CNA APIs as the product. At 60Hz it covers the original five-second countdown followed by two seconds of acceleration:

updates=420 draws=420 distance=14.150156 carParts=12
=== Racing Drivable Scene: PASS ===

Debug and ASan/UBSan captures are byte-identical with SHA-256 c845541c86c4b0124b94b9cef1203ccb1da19085cdc58db714e6ac133dfff216. Both visibly contain the chase-camera car, wheels, glass/reflections, complete road, rails, landscape and sky.

The cumulative gate also passed:

  • physics/player/camera FNA comparison: 739 records, non-camera exact, camera at most 16 ULP;
  • Track FNA comparison: 70 exact records including three checkpoint records;
  • OPENGL33 harness: 107/107 Debug and 107/107 ASan/UBSan;
  • FNA/CNA static scene: RMSE 0.002230, 99.0503% of channels within 2;
  • LSan: only the pre-classified 100,956 bytes / 449 allocations rooted entirely in external libGLX_mesa frames;
  • git diff --check: pass.

Remaining scope

Milestone 6 owns persistent settings/highscores, complete replay load/save and ghost interpolation, full lap/race completion and end-to-end deterministic race traces. Milestone 7 owns all decorative objects and final render composition; later milestones own UI, audio and platform completion.