Replace pkg_resources with importlib.resources

docs/guide.rst

@@ -246,3 +246,9 @@ Freezing apps
 In wgpu a PyInstaller-hook is provided to help simplify the freezing process
 (it e.g. ensures that the wgpu-native DLL is included). This hook requires
 PyInstaller version 4+.
+
+Our hook also includes ``glfw`` when it is available, so code using ``wgpu.gui.auto``
+should Just Work.
+
+Note that PyInstaller needs ``wgpu`` to be installed in `site-packages` for
+the hook to work (i.e. it seems not to work with a ``pip -e .`` dev install).

wgpu/_coreutils.py

@@ -3,13 +3,26 @@
 """
 
 import re
+import sys
+import atexit
 import logging
-from pkg_resources import resource_filename
+import importlib.resources
+from contextlib import ExitStack
+
+
+_resource_files = ExitStack()
+atexit.register(_resource_files.close)
 
 
 def get_resource_filename(name):
     """Get the filename to a wgpu resource."""
-    return resource_filename("wgpu.resources", name)
+    if sys.version_info < (3, 9):
+        context = importlib.resources.path("wgpu.resources", name)
+    else:
+        ref = importlib.resources.files("wgpu.resources") / name
+        context = importlib.resources.as_file(ref)
+    path = _resource_files.enter_context(context)
+    return str(path)
 
 
 class WGPULogger(logging.getLoggerClass()):

wgpu/resources/__init__.py

@@ -1,2 +1,2 @@
-""" This module exists to have setuptools recognize the folder as a module
+""" This module exists to have importlib.resources and setuptools recognize the folder as a module.
 """