Bump engine submodule and move batch flags and meshes to ctypes.

engine

@@ -1 +1 @@
-Subproject commit 84ea17f1cca7d4d9c27be716c38e19f70335fa8a
+Subproject commit abf1e87a3677cc01543f295df588cfa5c54db4e4

game/batch.py

@@ -13,34 +13,36 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from ctypes import POINTER
+from ctypes import c_ubyte, c_uint, POINTER
 from array import array
 
 from engine import (
     INSTANCE_FLAG_SPAWNED, BATCH_MAX_SIZE, create_batch, draw_batch, destroy_batch)
 
 class Batch:
-    __slots__ = '_batch', '_paramsp', 'max_size', 'flags', 'meshes', 'params'
+    __slots__ = '_batch', '_paramsp', 'size', 'max_size', 'flags', 'meshes', 'params'
 
     def __init__(self, vertices, max_size, params_format, params_type):
         assert max_size <= BATCH_MAX_SIZE
         self._batch = create_batch(vertices, max_size, params_format)
         self._paramsp = POINTER(params_type)
+        self.size = 0
         self.max_size = max_size
-        self.flags = array('B')
-        self.meshes = array('I')
+        self.flags = (c_ubyte * max_size)()
+        self.meshes = (c_uint * max_size)()
         self.params = (params_type * max_size)()
 
     def __del__(self):
         destroy_batch(self._batch)
 
     def append(self, flags, mesh, params):
-        index = len(self.flags)
+        index = self.size
         assert index < self.max_size
-        self.flags.append(flags | INSTANCE_FLAG_SPAWNED)
-        self.meshes.append(mesh)
+        self.flags[index] = flags | INSTANCE_FLAG_SPAWNED
+        self.meshes[index] = mesh
         self.params[index] = params
+        self.size += 1
         return index
 
     def draw(self):
-        draw_batch(self._batch, self.flags, self.meshes, self._paramsp(self.params))
+        draw_batch(self._batch, self.size, self.flags, self.meshes, self._paramsp(self.params))