Convert enemy vs bullet collision into a loop

The fact that unrolling the loop was easier or faster was a plain lie
from my lazyness. Convert it into a proper loop just so we can
experiment with adding more enemies in one screen.

Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/src/enemies.s b/src/enemies.s
index b6005fc..33b4c33 100644
--- a/src/enemies.s
+++ b/src/enemies.s
@@ -17,13 +17,11 @@
     ;; change it there.
     ENEMIES_POOL_CAPACITY = 3
 
-    ;; The capacity of the enemies pool in bytes.
-    ENEMIES_POOL_CAPACITY_BYTES = ENEMIES_POOL_CAPACITY * 4
+    ;; The amount of bytes each pool item takes.
+    SIZEOF_POOL_ITEM = 4
 
-    ;; Indeces where each enemy definition starts on the pool.
-    ENEMY_0_IDX = 0
-    ENEMY_1_IDX = 4
-    ENEMY_2_IDX = 8
+    ;; The capacity of the enemies pool in bytes.
+    ENEMIES_POOL_CAPACITY_BYTES = ENEMIES_POOL_CAPACITY * SIZEOF_POOL_ITEM
 
     ;; Initial X coordinates for enemies depending on if they appear on the
     ;; left/right edge of the screen.