added another OpenGL setting ("use caching") - this should solve the problem...

added another OpenGL setting ("use caching") - this should solve the problem reported by a Windows user:
* http://sourceforge.net/tracker/index.php?func=detail&aid=3465407&group_id=237831&atid=1104176


git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@1226 bbaffbd6-741e-11dd-a85d-61de82d9cad9

share/ui/opengl.ui

@@ -134,6 +134,20 @@
                 <property name="position">4</property>
               </packing>
             </child>
+            <child>
+              <object class="GtkCheckButton" id="OpenGLCache">
+                <property name="label" translatable="yes">Use caching</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">False</property>
+                <property name="tooltip_text" translatable="yes">OpenGL caching (via Display Lists) works without problems for most users. But if your 3D view is distorted or not usable at all, then you should consider to disable caching. The cache improves performance significantly.</property>
+                <property name="draw_indicator">True</property>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="position">4</property>
+              </packing>
+            </child>
           </object>
         </child>
       </object>

src/pycam/Plugins/OpenGLViewModel.py

@@ -92,9 +92,12 @@ class OpenGLViewModel(pycam.Plugins.PluginBase):
                         GL.GL_AMBIENT_AND_DIFFUSE, color)
                 # we need to wait until the color change is active
                 GL.glFinish()
+                if self.core.get("opengl_cache_enable"):
                     key = self._get_cache_key(model, color=color,
                             show_directions=self.core.get("show_directions"))
                     do_caching = not key is None
+                else:
+                    do_caching = False
                 if do_caching and not key in self._cache:
                     # Rendering a display list takes less than 5% of the time
                     # for a complete rebuild.

src/pycam/Plugins/OpenGLWindow.py

@@ -98,7 +98,8 @@ class OpenGLWindow(pycam.Plugins.PluginBase):
                     ("view_light", "OpenGLLight", True),
                     ("view_shadow", "OpenGLShadow", True),
                     ("view_polygon", "OpenGLPolygon", True),
-                    ("view_perspective", "OpenGLPerspective", True)):
+                    ("view_perspective", "OpenGLPerspective", True),
+                    ("opengl_cache_enable", "OpenGLCache", True)):
                 obj = self.gui.get_object(objname)
                 self.core.add_item(name, obj.get_active, obj.set_active)
                 obj.set_active(default)
@@ -217,7 +218,8 @@ class OpenGLWindow(pycam.Plugins.PluginBase):
                 set_func = lambda value: self.core.set(name, value)
                 return get_func, set_func
             for name in ("view_light", "view_shadow", "view_polygon",
-                    "view_perspective", "drill_progress_max_fps"):
+                    "view_perspective", "opengl_cache_enable",
+                    "drill_progress_max_fps"):
                 self.register_state_item("settings/view/opengl/%s" % name,
                         *get_get_set_functions(name))
         return True