init_mgl_context fails when no callback is provided

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## 3.0.2
+
+* Fixed an issue causing `BaseWindow.init_mgl_context` to fail if no context
+  creation callback was provided.
+
 ## 3.0.1
 
 * Timers now have `fps` and `fps_average` properties for obtaining the current and average frame rate

docs/conf.py

@@ -60,7 +60,7 @@ def __getattr__(cls: Any, name: Any) -> MagicMock:
 author = "Einar Forselv"
 
 # The short X.Y version
-version = "3.0.1"
+version = "3.0.2"
 # The full version, including alpha/beta/rc tags
 release = version
 

moderngl_window/__init__.py

@@ -19,7 +19,7 @@
 from moderngl_window.utils.keymaps import AZERTY, QWERTY, KeyMap, KeyMapFactory  # noqa
 from moderngl_window.utils.module_loading import import_string
 
-__version__ = "3.0.1"
+__version__ = "3.0.2"
 
 IGNORE_DIRS = [
     "__pycache__",

moderngl_window/context/base/window.py

@@ -92,7 +92,7 @@ def __init__(
         samples: int = 0,
         cursor: bool = True,
         backend: Optional[str] = None,
-        context_creation_func: Optional[Callable] = None,
+        context_creation_func: Optional[Callable[[], Optional[moderngl.Context]]] = None,
         **kwargs: Any,
     ) -> None:
         """Initialize a window instance.
@@ -190,10 +190,13 @@ def init_mgl_context(self) -> None:
         Keyword Args:
             ctx: An optional custom ModernGL context
         """
+        ctx: Optional[moderngl.Context] = None
         if self._context_creation_func:
-            self._ctx = self._context_creation_func()
-        if self._ctx is None:
-            self._ctx = moderngl.create_context(require=self.gl_version_code)
+            ctx = self._context_creation_func()
+        if ctx is None:
+            ctx = moderngl.create_context(require=self.gl_version_code)
+        self._ctx = ctx
+
         err = self._ctx.error
         if err != "GL_NO_ERROR":
             logger.info("Consumed the following error during context creation: %s", err)

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "moderngl-window"
-version = "3.0.1"
+version = "3.0.2"
 description = "A cross platform helper library for ModernGL making window creation and resource loading simple"
 readme = "README.md"
 authors = [{ name = "Einar Forselv", email = "[email protected]" }]