Begin custom PLASMA_GAME engine

According to the sparse documentation, custom render engines are the most
future-proof way of customizing the internal blender panels.
Unfortunately, even then, we must do some metaprogramming hacks...

korman/__init__.py

@@ -14,11 +14,11 @@
 #    along with Korman.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
-from . import exporter
+from . import exporter, render
 
 bl_info = {
     "name":        "Korman",
-    "author":      "Guild of Writers H'uru Team",
+    "author":      "Guild of Writers",
     "blender":     (2, 6, 3), # I can't be bothered to support old stuff
     "location":    "File > Import-Export",
     "description": "Exporter for Cyan Worlds' Plasma Engine",

korman/render.py

@@ -0,0 +1,47 @@
+#    This file is part of Korman.
+#
+#    Korman is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    Korman is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with Korman.  If not, see <http://www.gnu.org/licenses/>.
+
+import bpy
+
+class PlasmaRenderEngine(bpy.types.RenderEngine):
+
+    bl_idname = "PLASMA_GAME"
+    bl_label = "Plasma Game"
+
+    pass
+
+# Explicitly whitelist compatible Blender panels...
+from bl_ui import properties_material
+properties_material.MATERIAL_PT_context_material.COMPAT_ENGINES.add("PLASMA_GAME")
+properties_material.MATERIAL_PT_preview.COMPAT_ENGINES.add("PLASMA_GAME")
+del properties_material
+
+@classmethod
+def _new_poll(cls, context):
+    """Nifty replacement for naughty built-in Blender poll()s"""
+    if context.scene.render.engine == "PLASMA_GAME":
+        return False
+    else:
+        # Dear god you better save the old poll...
+        return cls._old_poll(cls, context)
+def _swap_poll(cls):
+    cls._old_poll = cls.poll
+    cls.poll = _new_poll
+
+# Hmm... Physics panels don't respect the supported engine thing.
+#        Metaprogramming to the rescue!
+from bl_ui import properties_physics_common
+_swap_poll(properties_physics_common.PhysicButtonsPanel)
+del properties_physics_common