Whether the 64-bit generations hold past 2^32 in the game, with every texture check, mirror sync and shadow copy of a
real scene, could not be seen in play: reaching 2^32 takes 15 to 66 hours. gen_wrap_check shows it for the generation
code alone. NX2NAVI_GEN_SEED=<n> (nx2navi.ini gen_seed, diagnostics, default 0) makes the run's first generation
n + 1: with 4294966000 a run passes 2^32 within its first seconds, and with 1099511627000 the low 32 bits pass
through 0 again.
The first gen_next, before anything is stamped, reads the value (gen_seed). It is parsed with strtoull, decimal or
0x hexadecimal: strtoul stops at 2^32 - 1 where unsigned long is 32 bits, as on Windows, and would turn a seed past
32 bits into 4294967295 without a word. It is capped at 2^62, far from the 64-bit end, and only ever raises the
counter, since a lower value would leave stamps newer than it that read as written at every check. A value that is
no number, or negative, is logged and ignored; a seed in use is logged as "mem: page generations start at <n>
(NX2NAVI_GEN_SEED, a test switch)". Without the switch the only cost is one compare a generation that is true once.
cfg.c gets its metas row (0, 0..4611686018427387904, read at start), its known[] name and its sections[] entry, each
on a line of its own next to the other memory test switches (STAGING_FAIL_AT, VRAM_BALLAST_MB); nx2navi.ini.example
gets a commented gen_seed entry under [diagnostics]. The settings menu does not show it.
tests/gen_wrap_check runs the generation code a second way: the counter left at 0 and the seed taken from
NX2NAVI_GEN_SEED, for 4294967288, 0xfffffffff8, 0x7ffffffffffffff8 (capped), 12abc, -8, 0 and unset, each with the
start and the log line expected of it, then the same compares across the boundary. With strtoul in place of strtoull
two of those runs fail. Checks that passed: gen_wrap_check, gen_width_check, cfg_rows_check (0 problems),
pass_cc_check on vk_memory.c and cfg.c, no new -Wall -Wextra warnings.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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