From aa9a8e8c7eecc2de77690b872931e88951622813 Mon Sep 17 00:00:00 2001 From: Simon Tatham Date: Mon, 3 May 2004 09:10:52 +0000 Subject: The Windows RNG turns out to only give about 16 bits at a time. This is (a) pretty feeble, and (b) means that although Net seeds transfer between platforms and still generate the same game, there's a suspicious discrepancy in the typical seed _generated_ by each platform. I have a better RNG kicking around in this code base already, so I'll just use it. Each midend has its own random_state, which it passes to new_game_seed() as required. A handy consequence of this is that initial seed data is now passed to midend_new(), which means that new platform implementors are unlikely to forget to seed the RNG because failure to do so causes a compile error! [originally from svn r4187] --- midend.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) (limited to 'midend.c') diff --git a/midend.c b/midend.c index 818b278..cacd66e 100644 --- a/midend.c +++ b/midend.c @@ -13,6 +13,8 @@ struct midend_data { frontend *frontend; + random_state *random; + char *seed; int fresh_seed; int nstates, statesize, statepos; @@ -36,11 +38,12 @@ struct midend_data { } \ } while (0) -midend_data *midend_new(frontend *frontend) +midend_data *midend_new(frontend *fe, void *randseed, int randseedsize) { midend_data *me = snew(midend_data); - me->frontend = frontend; + me->frontend = fe; + me->random = random_init(randseed, randseedsize); me->nstates = me->statesize = me->statepos = 0; me->states = NULL; me->params = default_params(); @@ -88,7 +91,7 @@ void midend_new_game(midend_data *me) if (!me->fresh_seed) { sfree(me->seed); - me->seed = new_game_seed(me->params); + me->seed = new_game_seed(me->params, me->random); } else me->fresh_seed = FALSE; @@ -252,7 +255,7 @@ float *midend_colours(midend_data *me, int *ncolours) float *ret; if (me->nstates == 0) { - char *seed = new_game_seed(me->params); + char *seed = new_game_seed(me->params, me->random); state = new_game(me->params, seed); sfree(seed); } else -- cgit v1.1