OS X: A few small tweaks for Cocoa windows.  Clearing the framebuffer right away, fixing multisampling for example
OS X: A few small tweaks for Cocoa windows.  Clearing the framebuffer right away, fixing multisampling for example

--HG--
branch : v1-7
extra : rebase_source : 9acc59ce72cb74667bbbf380c17baa3afbb0bdd6

bhlzlx/ogre,ehsan/ogre,bhlzlx/ogre,bhlzlx/ogre,ehsan/ogre,ruleless/ogre,ehsan/ogre,ruleless/ogre,ehsan/ogre,ruleless/ogre,bhlzlx/ogre,ruleless/ogre,bhlzlx/ogre,ruleless/ogre,bhlzlx/ogre,ehsan/ogre,ruleless/ogre