M src/platform/python/mgba/core.py → src/platform/python/mgba/core.py

@@ -31,9 +31,17 @@ if not core or not core.loadROM(vf):
         return None
     return core
 
+def needsReset(f):
+    def wrapper(self, *args, **kwargs):
+        if not self._wasReset:
+            raise RuntimeError("Core must be reset first")
+        return f(self, *args, **kwargs)
+    return wrapper
+
 class Core(object):
     def __init__(self, native):
         self._core = native
+        self._wasReset = False
 
     @cached_property
     def tiles(self):
@@ -92,13 +100,17 @@ self._core.setVideoBuffer(self._core, image.buffer, image.stride)
 
     def reset(self):
         self._core.reset(self._core)
+        self._wasReset = True
 
+    @needsReset
     def runFrame(self):
         self._core.runFrame(self._core)
 
+    @needsReset
     def runLoop(self):
         self._core.runLoop(self._core)
 
+    @needsReset
     def step(self):
         self._core.step(self._core)
 
@@ -120,6 +132,7 @@
     def clearKeys(self, *args, **kwargs):
         self._core.clearKeys(self._core, self._keysToInt(*args, **kwargs))
 
+    @needsReset
     def frameCounter(self):
         return self._core.frameCounter(self._core)
 

M src/platform/python/mgba/gb.py → src/platform/python/mgba/gb.py

@@ -5,7 +5,7 @@ # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 from ._pylib import ffi, lib
 from .lr35902 import LR35902Core
-from .core import Core
+from .core import Core, needsReset
 from .memory import Memory
 from .tile import Sprite
 
@@ -25,6 +25,7 @@ self._native = ffi.cast("struct GB*", native.board)
         self.sprites = GBObjs(self)
         self.cpu = LR35902Core(self._core.cpu)
 
+    @needsReset
     def _initTileCache(self, cache):
         lib.GBVideoTileCacheInit(cache)
         lib.GBVideoTileCacheAssociate(cache, ffi.addressof(self._native.video))

M src/platform/python/mgba/gba.py → src/platform/python/mgba/gba.py

@@ -5,7 +5,7 @@ # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 from ._pylib import ffi, lib
 from .arm import ARMCore
-from .core import Core
+from .core import Core, needsReset
 from .tile import Sprite
 from .memory import Memory
 
@@ -28,6 +28,7 @@ self.sprites = GBAObjs(self)
         self.cpu = ARMCore(self._core.cpu)
         self.memory = GBAMemory(self._core)
 
+    @needsReset
     def _initTileCache(self, cache):
         lib.GBAVideoTileCacheInit(cache)
         lib.GBAVideoTileCacheAssociate(cache, ffi.addressof(self._native.video))