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fairland: Track adjacent land sectors

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The next commit will put it to use.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
This commit is contained in:
Markus Armbruster 2020-09-06 08:44:09 +02:00
parent 49c494a8d7
commit 5aa3938b37
1 changed files with 25 additions and 0 deletions
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25
src/util/fairland.c
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@ -188,6 +188,13 @@ static int diry[] = { 0, -1, -1, 0, 1, 1 };
static int **own; /* owner of the sector. -1 means water */
/*
* Adjacent land sectors
* adj_land[XYOFFSET(x, y)] bit d is set exactly when the sector next
* to x, y in direction d is land.
*/
static unsigned char *adj_land;
/*
* Exclusive zones
* Each island is surrounded by an exclusive zone where only it may
@ -494,6 +501,7 @@ allocate_memory(void)
capx = calloc(nc, sizeof(int));
capy = calloc(nc, sizeof(int));
own = calloc(WORLD_X, sizeof(int *));
adj_land = malloc(WORLD_SZ() * sizeof(*adj_land));
xzone = malloc(WORLD_SZ() * sizeof(*xzone));
elev = calloc(WORLD_X, sizeof(int *));
for (i = 0; i < WORLD_X; ++i) {
@ -530,6 +538,7 @@ init(void)
own[i][j] = -1;
}
}
memset(adj_land, 0, WORLD_SZ() * sizeof(*adj_land));
}
/****************************************************************************
@ -766,6 +775,21 @@ can_grow_at(int c, int x, int y)
return own[x][y] == -1 && xzone_ok(c, x, y);
}
static void
adj_land_update(int x, int y)
{
int dir, nx, ny, noff;
assert(own[x][y] != -1);
for (dir = DIR_FIRST; dir <= DIR_LAST; dir++) {
nx = new_x(x + diroff[dir][0]);
ny = new_y(y + diroff[dir][1]);
noff = XYOFFSET(nx, ny);
adj_land[noff] |= 1u << DIR_BACK(dir);
}
}
static void
add_sector(int c, int x, int y)
{
@ -775,6 +799,7 @@ add_sector(int c, int x, int y)
secty[c][isecs[c]] = y;
isecs[c]++;
own[x][y] = c;
adj_land_update(x, y);
}
static int