Dungeons: Make multiple large rooms possible (#8678)

Re-add the random size range for large rooms.
Remove 'first_room_large' bool.
Add 'large_room_chance' parameter that can disable large rooms,
specify 1 large room, or specify a chance for large rooms.
If 1 or a chance is specified, the first generated room is large,
to take advantage of the intersection checks that are done for the
1st room only.

1 files changed, 8 insertions, 4 deletions

diff --git a/src/mapgen/dungeongen.h b/src/mapgen/dungeongen.h
index dd5245fa9..d2e733f71 100644
--- a/src/mapgen/dungeongen.h
+++ b/src/mapgen/dungeongen.h
@@ -58,10 +58,14 @@ struct DungeonParams {
 	// Room size random range. Includes walls / floor / ceilng
 	v3s16 room_size_min;
 	v3s16 room_size_max;
-	// Large room size
-	v3s16 room_size_large;
-	// First generated room is large
-	bool first_room_large;
+	// Large room size random range. Includes walls / floor / ceilng
+	v3s16 room_size_large_min;
+	v3s16 room_size_large_max;
+	// Value 0 disables large rooms.
+	// Value 1 results in 1 large room, the first generated room.
+	// Value > 1 makes the first generated room large, all other rooms have a
+	// '1 in value' chance of being large.
+	u16 large_room_chance;
 	// Dimensions of 3D 'brush' that creates corridors.
 	// Dimensions are of the empty space, not including walls / floor / ceilng.
 	v3s16 holesize;