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Fix f5183807: Tree planting scaling on extra large maps

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This commit is contained in:
Jonathan G Rennison
2021-05-21 18:40:10 +01:00
parent f5183807fe
commit 30409192f0
1 changed files with 14 additions and 12 deletions
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26
src/tree_cmd.cpp
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@@ -930,17 +930,17 @@ static void TileLoop_Trees(TileIndex tile)
* Decrement the tree tick counter.
* The interval is scaled by map size to allow for the same density regardless of size.
* Adjustment for map sizes below the standard 256 * 256 are handled earlier.
* @return true if the counter was decremented past zero
* @return number of trees to try to plant
*/
bool DecrementTreeCounter()
uint DecrementTreeCounter()
{
/* Ensure _trees_tick_ctr can be decremented past zero only once for the largest map size. */
static_assert(2 * (MAX_MAP_SIZE_BITS - MIN_MAP_SIZE_BITS) - 4 <= std::numeric_limits<byte>::digits);
uint scaled_map_size = ScaleByMapSize(1);
if (scaled_map_size >= 256) return scaled_map_size >> 8;
/* byte underflow */
byte old_trees_tick_ctr = _trees_tick_ctr;
_trees_tick_ctr -= ScaleByMapSize(1);
return old_trees_tick_ctr <= _trees_tick_ctr;
_trees_tick_ctr -= scaled_map_size;
return old_trees_tick_ctr <= _trees_tick_ctr ? 1 : 0;
}
void OnTick_Trees()
@@ -969,13 +969,15 @@ void OnTick_Trees()
}
}
if (!DecrementTreeCounter() || _settings_game.construction.extra_tree_placement == ETP_SPREAD_RAINFOREST) return;
if (_settings_game.construction.extra_tree_placement == ETP_SPREAD_RAINFOREST) return;
/* place a tree at a random spot */
r = Random();
tile = RandomTileSeed(r);
if (CanPlantTreesOnTile(tile, false) && (tree = GetRandomTreeType(tile, GB(r, 24, 8))) != TREE_INVALID) {
PlantTreesOnTile(tile, tree, 0, 0);
for (uint ctr = DecrementTreeCounter(); ctr > 0; ctr--) {
/* place a tree at a random spot */
r = Random();
tile = RandomTileSeed(r);
if (CanPlantTreesOnTile(tile, false) && (tree = GetRandomTreeType(tile, GB(r, 24, 8))) != TREE_INVALID) {
PlantTreesOnTile(tile, tree, 0, 0);
}
}
}