Fix __enter__ and __exit__ method signatures.

Author: adamlwgriffiths

pygly/camera_node.py

@@ -32,13 +32,13 @@ def __init__( self, name, view_matrix ):
         #: the camer's view matrix
         self.view_matrix = view_matrix
 
-    def _enter(self):
+    def __enter__(self):
         # apply our view matrix
         # and push our model view
         self.view_matrix.push_view_matrix()
         self.push_model_view()
 
-    def _exit(self):
+    def __exit__(self):
         # pop our model view
         # and our view matrix
         self.pop_model_view()

pygly/view_matrix.py

@@ -39,10 +39,10 @@ def __init__( self, aspect_ratio, near_clip, far_clip ):
         self._matrix = None
         self.dirty = True
 
-    def _enter(self):
+    def __enter__(self):
         self.push_view_matrix()
 
-    def _exit(self):
+    def __exit__(self):
         self.pop_view_matrix()
 
     @property

pygly/viewport.py

@@ -112,15 +112,15 @@ def switch_to( self ):
         # update our viewport size
         gl.set_viewport( self.rect )
 
-    def _enter(self):
+    def __enter__(self):
         # activate our viewport
         # scissor to the viewport
         # and set our gl state
         self.switch_to()
         self.scissor_to_viewport()
         self.push_viewport_attributes()
 
-    def _exit(self):
+    def __exit__(self):
         # pop our gl state
         # reset our scissor
         # and reset our viewport to full size