Suppress GLFW dock icon on macOS.

Before this change, when GLFW is imported (e.g. via `from dm_control import suite`) on macOS, a Python rocket icon appears bouncing on the dock until the Python process quits.

PiperOrigin-RevId: 417036346
Change-Id: I24a467195c00f82da627cbbf0a31c602e6e437bd

dm_control/_render/glfw_renderer.py

@@ -15,6 +15,8 @@
 
 """An OpenGL renderer backed by GLFW."""
 
+import platform
+
 from dm_control._render import base
 from dm_control._render import executor
 
@@ -25,7 +27,13 @@
 except (ImportError, IOError, OSError) as exc:
   raise ImportError from exc
 try:
-  glfw.init()
+  if platform.system() == 'Darwin':
+    # By default, GLFW creates a Cocoa menubar on macOS, which results in a
+    # Python rocket icon appearing in the dock. We don't want this since
+    # dm_control._render only uses GLFW for offscreen rendering.
+    glfw.init_hint(glfw.COCOA_MENUBAR, glfw.FALSE)
+  else:
+    glfw.init()
 except glfw.GLFWError as exc:
   raise ImportError from exc
 

setup.py

@@ -191,7 +191,7 @@ def is_excluded(s):
   return list(paths)
 
 setup(
-    version='0.0.416999250',
+    version='0.0.417036346',
     description='Continuous control environments and MuJoCo Python bindings.',
     author='DeepMind',
     license='Apache License, Version 2.0',