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Racing Milestone 7 — complete world and in-race rendering

Result

Milestone 7 completed on 2026-09-03. The complete race scene now renders through the original XNA 4 content graph: replay ghost, authored/procedural world, shadows, city plane, brake tracks, lens flare, post-processing and desktop in-race HUD. No GLB, loose substitute, hand-translated effect or sample-side framework workaround is present. Non-race menus and their lifecycle remain Milestone 8 work.

Frozen revisions

  • CNA: 056e57d478f8e6accfa9124337803e735b39f1e4
  • cna-samples pre-HUD revision: ed16a3818d0b330f50da9c678f7d47f28e0341a9
  • sharp-runtime: 6baf0925e0bf7805a363836deed90543d26f6d28
  • meta-gl: 20c8b2dc5bb80e32706784066db9fd9e15b3f46a
  • EasyGL: deda7a426c3c166c0e03a4790f1ede610e2e46fb
  • renderer/profile: CNA OPENGL33, HiDef, Mesa OpenGL 4.5 core

Rendering closure

The product draws the generated best replay through the authentic LightingShader.xnb ShadowCar technique. It resolves all 53 original landscape models and 1,252 seeded Beginner objects, including all ten combination files and source-ordered procedural placement. Authentic ShadowMap.xnb and PostScreenShadowBlur.xnb run the caster, receiver and two-pass blur sequence in real Rgba64 render targets. The original city-ground geometry, capped/overlap- filtered brake tracks, seven-texture/17-record lens flare and five-pass PostScreenGlow.xnb composition are active.

The renderer work exposed two general engine defects rather than accepting sample fallbacks. CNA/meta-gl now provide truthful desktop RGBA16 UNORM render targets, and CNA executes legacy compiled-Effect pass assignments. Their focused tests and the authentic Racing effect fixtures passed before the dependent sample work was committed.

HUD closure

UIRenderer, Texture, TextureFont, TextureFontBigNumbers and the original color/coordinate helpers load the authentic Textures/Ingame.xnb and Textures/GameFont.xnb. The port preserves the original atlas rectangles, 1600x1200 and 1400x1050 mapping, timing/ranking strings, lap/speed/gear digits, tachometer rotation and checkpoint/lap fade-up duration.

The focused real-GL probe checks more than visible white glyphs: the XNB retains a known black panel texel with alpha 154, and drawing it over (200,200,200,255) produces (79,79,79,255). This caught an initially reversed alpha/additive batch begin order in the C++ translation; restoring the exact source order fixed the panel without changing CNA or the asset. A fixed 146 mph scenario submits 15 atlas sprites, 13 text entries and 67 glyphs; the final product frame naturally submits 14 sprites because its speed has two digits, plus the same 67 glyphs.

Qualification

samples/RacingGameHarness/scripts/qualify-milestone1.sh passed with at most eight parallel build jobs:

  • physics/player/camera oracle: 753 records, with all non-camera records exact and the established camera bound at 16 ULP;
  • Track/Replay oracle: 79/79 exact records;
  • real OPENGL33 harness: 146/146 in Debug and ASan/UBSan;
  • 420-frame product scene: PASS in Debug and ASan/UBSan, including 14 HUD atlas sprites and 67 glyphs on the final frame;
  • standalone HUD captures: identical Debug/ASan/classified-LSan SHA-256 c1859ce2fdeb5fc41f637b9b659197be288f563ce09ae96e2ecb8f318ed58364;
  • complete product captures: identical Debug/ASan SHA-256 a38811ade71f9460abd32d1129877b98cc3c94585ecc86ff763d5ddceb2bfa1c;
  • FNA/CNA static scene: RMSE 0.002230, 99.0503% of channels within 2;
  • LeakSanitizer: 100,956 bytes / 449 allocations rooted wholly in external libGLX_mesa frames;
  • git diff --check: pass.

Evidence is retained under /rv/tmp/samples/SAMPLE-152-XNA-4-Racing-Game-Kit-master/evidence/, particularly cna-opengl33/milestone5/, cna-opengl33/milestone7/ and fna-postprocess-oracle/.

Next milestone

Milestone 8 owns the original splash/menu/options/car and track selection/help/ highscore/race-return stack, supplied XACT banks, settings/highscores/replay persistence and complete launch-to-menu lifecycle.