fixed artifact when using order independent transparency with texture in nVidia and mesa. tracker item 958
fixed artifact when using order independent transparency with texture in nVidia and mesa. tracker item 958

git-svn-id: 4705079bc6b8aadf675e3696f5c015a6aa4916e3@5845 3c1deb5b-d424-0410-962d-aba41a686d42

OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,hsorby/zinc,OpenCMISS/zinc,hsorby/zinc