nx_raster3d_bilinear.nx

nx_raster3d_bilinear.nx -- GATE: BILINEAR TEXTURE FILTERING, the SOTA texture-quality upgrade (smooth sampling vs blocky nearest-neighbor). Blends the 4 nearest texels by the fractional (u,v) position, per color channel, all in integer fixed-point (FBITS=8) => BIT-EXACT on any CPU, no GPU. Combined with the perspective-correct mapping (nx_raster3d_tex) this is what real GPUs do. Nearest-neighbor is the low-quality baseline; bilinear is SOTA. T1 bilinear KAT: sampling EXACTLY between a black and a white texel yields gray (~127) -- a blend nearest cannot make. T2 weighting KAT: sampling 1/4 of the way yields ~64 (25% of 255) -- proves fractional weighting, not rounding. T3 a bilinear-filtered textured quad produces INTERMEDIATE colors (smooth) that nearest-neighbor would never emit. T4 (EXCEED) determinism -- bit-identical across runs. expect_exit: 0 Sovereign: nx_syscalls. NEVER-BRICK: software render, writes 0 GPU firmware.