get rid of float division

2014-03-21 13:32:03 +01:00
parent a4cda4ce20
commit 0730ca640b
1 changed files with 3 additions and 3 deletions
--- a/src/map/tile.cpp
+++ b/src/map/tile.cpp
@@ -12,9 +12,9 @@ Tile::ID Tile::ID::parent(int8_t parent_z) const {
    assert(parent_z < z);
    int32_t dim = pow(2, z - parent_z);
    return Tile::ID{
-        static_cast<int8_t>(parent_z),
-        static_cast<int32_t>(floor((float)x / dim)),
-        static_cast<int32_t>(y / dim)
+        parent_z,
+        (x >= 0 ? x : x - dim + 1) / dim,
+        y / dim
    };
 }