nx_tier_ladder_lib.nx

nx_tier_ladder_lib.nx -- THE RENDER-DOOR LADDER RULER (LIB, no main). gpu GP3 rk_tier_ladder / gameengine GE45. THE DEFECT THIS EXISTS TO MAKE REFUSABLE. Every world page chose its renderer by a chain of ifs buried in emitted JS (WebGPU only under ?gpu=1, WebGL2 by default, the sovereign rasteriser on ?gl=0 or on refusal), announced the winner as a free-text badge, and said NOTHING about why the higher doors were not taken. A headless capture of nishifamily.com/world/beach?gpu=1 on 2026-09-02 read `kernel unrun` on the WebGL2 tier with no word about WebGPU: levered off? adapter absent? device limits? a wedged requestAdapter? Four causes, one silence -- and the operator's question "which door drew this frame and why" had no mechanical answer. ONE TABLE, TWO SURFACES (the nx_glprobe_lib law). The ladder is DATA in knowledge/tier_ladder.conf: one door| row per renderer with its order, its state (default / levered / fallback), the URL lever that asks for it, the capability it requires and the badge it announces, plus limit| rows naming the GPUSupportedLimits minima the GE43 kernel needs. This lib parses those rows, walks them natively (tl_pick, tl_reason) and EMITS the same rows plus the JS that walks them in the page (tl_js). nx_tier_ladder_gate pins the native walk with a truth table and pins the emitted JS to the same ids and the same reason vocabulary, so the page and the ruler cannot disagree. The ORDER lives in the conf and nowhere in code: flipping WebGPU to the default (gameengine GE1) is an edit to that file under the operator's order, never a code change. REFUSE, NEVER GUESS. A conf whose fallback is not the last row, whose orders regress, whose door carries a double quote or a backslash (it is emitted into a JS string literal verbatim) or whose limit is not a positive integer is REFUSED with a numbered verdict and the offending line, and tl_emit then emits a NAMED absence (window.__nx_ladder=null plus window.__nx_ladder_absent) and announces it on stderr, so a page built from a broken conf says so on its HUD instead of drawing an unexplained frame. WHAT THE DOOR DRAWS IS DATA TOO (S0, 2026-09-04). Each door row carries a draws word -- world / world+cast / world+markers -- parsed here (tl_door_draws), carried into window.__nx_ladder, read back for the active door by nxDoorDraws() and appended to the tier badge by the page emitter, so a gate, the HUD, page-verify and the referee can STATE that a WebGPU frame carries no character instead of inferring it from prose (the fact lived only in the webgpu row's announce field and the token cast occurred 0 times in this lib). An unknown draws word REFUSES (TL_E_DRAWS) and a door row without the field REFUSES BY NAME (TL_E_DRAWS_ABSENT) -- never a default to the permissive value: pr_mode silently defaulting an unrecognised route mode to the open value is the measured defect this must not repeat, and a row written before the field existed must be re-declared by a reader of the emitter, not guessed at by the parser. PLAIN-IF ONLY (no else) and NO BITWISE OPERATORS -- the imported-else parser landmine, debt 1784673261; per-door lever flags travel as an i64 array, never as bits. license_tier: ORIGINAL No hw writes (Rule 26).