nx_cast_shader_lbs_candidate_t181.nx

nx_cast_shader_src.nx -- THE CHARACTER CAST VERTEX STAGE, WRITTEN ONCE (gameengine S12c, 2026-09-05). The cast vertex shader that nx_game_page_emit ships as the hand-written GLSL literal MVS (extracted to the board as buildroot/knowledge/compare/cast_mvs_hand.glsl, 2,485 raw / 2,521 expanded / 3,097 canonical tokens) is transcribed here SLICE BY SLICE as shader-IR builder calls, so that BOTH dialects are emitted from one source: GLSL for the WebGL2 door (proven against the hand text by nx_glsl_tokdiff -- an emitted slice is accepted when its canonical token stream is a PREFIX of the hand's up to main's closing brace, slice_prefix=1, and the whole stage when the verdict reads IDENTICAL) and WGSL for the WebGPU door (the S12 cast pipeline). The vocabulary is nx_world_shader_src's ws_* shorthands over nx_shader_ir; nothing here re-implements a builder. RULES THAT KEEP THE CANONICAL FORM REACHABLE: a negative literal is sir_neg over the positive literal ((-999.0), never a "-999.0" literal); every literal is spelled with the hand's own digits, canonically (0.5 not .5, 0.930 not 0.93 -- the ruler canonicalises spelling, never value); a compound assignment is x=(x op (y)); left-associative chains are built left-nested exactly as the grammar parses them; the hand's grouping parentheses are simply the tree's shape. The f32 uniform arrays the hand declares (uOF uGB uGT uGN, float[12]) are declared EXACTLY as the hand does -- the uniform-space stride rule is a WGSL-dialect fact and belongs in the WGSL backend's lowering (S12c-2b), never in this source. SLICES (each measured, journaled on gameengine.plan under GE59): 1 declarations + hsh + the instance/lock prologue (through vII=ii;) -- MEASURED 602/3097 canonical, slice_prefix 2 dual-quaternion skinning off the joint table, garment displacement, the PASS-1 face cut, the y-up rotation and world placement (through vec3 wp=...;) 3 soft-body fields (hb2, sbo over the DYNA anchors, hair wind, dress inheritance, the body branch), wp+=sbo 4 garment degeneration, the cast-shadow projection, vW, the clip transform (gl_Position) license_tier: ORIGINAL No hw writes (Rule 26).