poll() as a python '@staticmethod' was too limiting and didnt allow useful base class poll functions in many cases.

now rna functions that dont have a 'self' are automatically assumed '@classmethods'.

de-duplicated poll functions and made some minor tweaks too.

release/scripts/ui/properties_render.py

@@ -40,16 +40,16 @@ class RenderButtonsPanel():
     bl_context = "render"
     # COMPAT_ENGINES must be defined in each subclass, external engines can add themselves here
 
+    @classmethod
+    def poll(cls, context):
+        rd = context.scene.render
+        return (context.scene and rd.use_game_engine is False) and (rd.engine in cls.COMPAT_ENGINES)
+
 
 class RENDER_PT_render(RenderButtonsPanel, bpy.types.Panel):
     bl_label = "Render"
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw(self, context):
         layout = self.layout
 
@@ -71,11 +71,6 @@ class RENDER_PT_layers(RenderButtonsPanel, bpy.types.Panel):
     bl_default_closed = True
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw(self, context):
         layout = self.layout
 
@@ -178,11 +173,6 @@ class RENDER_PT_shading(RenderButtonsPanel, bpy.types.Panel):
     bl_label = "Shading"
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw(self, context):
         layout = self.layout
 
@@ -207,11 +197,6 @@ class RENDER_PT_performance(RenderButtonsPanel, bpy.types.Panel):
     bl_default_closed = True
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw(self, context):
         layout = self.layout
 
@@ -254,11 +239,6 @@ class RENDER_PT_post_processing(RenderButtonsPanel, bpy.types.Panel):
     bl_default_closed = True
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw(self, context):
         layout = self.layout
 
@@ -297,11 +277,6 @@ class RENDER_PT_output(RenderButtonsPanel, bpy.types.Panel):
     bl_label = "Output"
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw(self, context):
         layout = self.layout
 
@@ -417,8 +392,8 @@ class RENDER_PT_encoding(RenderButtonsPanel, bpy.types.Panel):
     bl_default_closed = True
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
+    @classmethod
+    def poll(cls, context):
         rd = context.scene.render
         return rd.file_format in ('FFMPEG', 'XVID', 'H264', 'THEORA')
 
@@ -484,11 +459,6 @@ class RENDER_PT_antialiasing(RenderButtonsPanel, bpy.types.Panel):
     bl_label = "Anti-Aliasing"
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw_header(self, context):
         rd = context.scene.render
 
@@ -518,11 +488,6 @@ class RENDER_PT_motion_blur(RenderButtonsPanel, bpy.types.Panel):
     bl_default_closed = True
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw_header(self, context):
         rd = context.scene.render
 
@@ -542,11 +507,6 @@ class RENDER_PT_dimensions(RenderButtonsPanel, bpy.types.Panel):
     bl_label = "Dimensions"
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw(self, context):
         layout = self.layout
 
@@ -593,11 +553,6 @@ class RENDER_PT_stamp(RenderButtonsPanel, bpy.types.Panel):
     bl_default_closed = True
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw_header(self, context):
         rd = context.scene.render
 
@@ -642,11 +597,6 @@ class RENDER_PT_bake(RenderButtonsPanel, bpy.types.Panel):
     bl_default_closed = True
     COMPAT_ENGINES = {'BLENDER_RENDER'}
 
-    @staticmethod
-    def poll(context):
-        rd = context.scene.render
-        return (context.scene and rd.use_game_engine is False) and (rd.engine in __class__.COMPAT_ENGINES)
-
     def draw(self, context):
         layout = self.layout