changed BD engine to match new GDash code (expanding walls)

diff --git a/src/game_bd/bd_caveengine.c b/src/game_bd/bd_caveengine.c
index 53acb862d28294fb0120805dc00f661a144809e0..f2753a1c16ed0451780568314b101d68d524f23c 100644 (file)
--- a/src/game_bd/bd_caveengine.c
+++ b/src/game_bd/bd_caveengine.c
@@ -3420,25 +3420,40 @@ void gd_cave_iterate(GdCave *cave, GdDirection player_move, boolean player_fire,
                get(cave, x, y) == O_V_EXPANDING_STEEL_WALL) &&
               cave->expanding_wall_changed))
          {
-           if (is_like_space(cave, x, y, GD_MV_LEFT))
+            // special case: check both directions when using old engine
+            boolean check_both_directions = TRUE;
+
+           if (check_both_directions && is_like_space(cave, x, y, GD_MV_LEFT))
            {
              store_dir(cave, x, y, GD_MV_LEFT, get(cave, x, y));
              play_sound_of_element(cave, get(cave, x, y), x, y);
+
+              // if using new engine, skip checking other direction (like "if ... else if ...")
+              check_both_directions = game_bd.game->use_old_engine;
            }
 
-           if (is_like_space(cave, x, y, GD_MV_RIGHT)) {
+           if (check_both_directions && is_like_space(cave, x, y, GD_MV_RIGHT))
+            {
              store_dir(cave, x, y, GD_MV_RIGHT, get(cave, x, y));
              play_sound_of_element(cave, get(cave, x, y), x, y);
            }
          }
          else
          {
-           if (is_like_space(cave, x, y, GD_MV_UP)) {
+            // special case: check both directions when using old engine
+            boolean check_both_directions = TRUE;
+
+           if (check_both_directions && is_like_space(cave, x, y, GD_MV_UP))
+            {
              store_dir(cave, x, y, GD_MV_UP, get(cave, x, y));
              play_sound_of_element(cave, get(cave, x, y), x, y);
+
+              // if using new engine, skip checking other direction (like "if ... else if ...")
+              check_both_directions = game_bd.game->use_old_engine;
            }
 
-           if (is_like_space(cave, x, y, GD_MV_DOWN)) {
+           if (check_both_directions && is_like_space(cave, x, y, GD_MV_DOWN))
+            {
              store_dir(cave, x, y, GD_MV_DOWN, get(cave, x, y));
              play_sound_of_element(cave, get(cave, x, y), x, y);
            }