Enable large overflow temples.

There are currently only three possible maps (one each of sizes 3, 5,
and 6), so the 10% chance might be too high.  On the other hand, given
how many times we see general_overflow_altar, maybe 10% is fine.

Only one multi-god overflow temple will be used per game.  Changing that
is possible but avoiding duplicates is notrivial, particularly when
there is only a single map for a given size.

The selection of overflow temple size should eventually be improved to
take map weights into account; currently it chooses uniformly from among
the possible overflow temple sizes.

1 files changed, 23 insertions, 2 deletions

diff --git a/crawl-ref/source/ng-init.cc b/crawl-ref/source/ng-init.cc
index 4f45545bcb..02f9ee4cce 100644
--- a/crawl-ref/source/ng-init.cc
+++ b/crawl-ref/source/ng-init.cc
@@ -196,7 +196,7 @@ void initialise_temples()
     // altar; they can contain any number of altars, so long as there's
     // at least one vault definition with the tag "overflow_temple_num"
     // (where "num" is the number of altars).
-    for (unsigned int i = 0; i < overflow_gods.size(); i++)
+    for (unsigned int i = 0, size = overflow_gods.size(); i < size; i++)
     {
         const unsigned int level = random_range(2, MAX_OVERFLOW_LEVEL);
 
@@ -209,9 +209,30 @@ void initialise_temples()
         CrawlVector &gods
             = temple[TEMPLE_GODS_KEY].new_vector(SV_BYTE);
 
-        // Only single-altar overflow temples for now.
+        // At least one god.
         gods.push_back((char) overflow_gods[i]);
 
+        // Maybe place a larger overflow temple.
+        if (i == 0 && size > 1 && one_chance_in(10))
+        {
+            unsigned int num_gods = 1;
+
+            // Randomly choose from the sizes which have maps.
+            // FIXME: it would be better to take weights into account.
+            int chance = 0;
+            for (unsigned int j = 2; j <= size; j++)
+            {
+                string mapname = make_stringf("temple_overflow_%d", j);
+                if (!find_maps_for_tag(mapname).empty())
+                    if (one_chance_in(++chance))
+                        num_gods = j;
+            }
+
+            // Add any extra gods (the first was added already).
+            for (; i < num_gods - 1; i++)
+                gods.push_back((char) overflow_gods[i + 1]);
+        }
+
         level_temples.push_back(temple);
     }
 }