nx_raster3d_tex.nx

nx_raster3d_tex.nx -- GATE: PERSPECTIVE-CORRECT TEXTURE MAPPING, the SOTA upgrade to the 3D pipeline (closes the GRAPHICS-API "Polish: textures" gap). Extends the integer-deterministic rasterizer (nx_raster3d) with textured triangles that interpolate u/z, v/z, 1/z linearly in screen space and per-pixel divide to recover perspective- correct (u,v) -- the Quake-era SOTA technique. Affine mapping (interpolating u,v directly) WARPS under perspective; this gate PROVES the difference with an exact KAT: on an edge from a near vertex (u=0) to one 3x farther (u=8), the screen midpoint must sample the PERSPECTIVE value u=2 (the near vertex dominates), not the affine midpoint u=4. T1 perspective-correct KAT: midpoint samples u=2 (NOT affine 4). T2 a textured checkerboard quad renders (filled + both texture colors present). T3 (EXCEED) determinism -- render twice -> BIT-IDENTICAL framebuffer. T4 equal-depth sanity: with all z equal, perspective-correct REDUCES to affine (u=4) -- correct in both regimes. expect_exit: 0 Sovereign: nx_syscalls. NEVER-BRICK: software render, writes 0 GPU firmware.