Update FBO completeness checks for depth textures

Trac #20875
Signed-off-by: Nicolas Capens

- improve missing attachment logic to allow no color attachments
- disallow depth texture color attachments
- allow texture depth and stencil attachments
- update simulaneous depth/stencil logic

git-svn-id: https://angleproject.googlecode.com/svn/trunk@1113 736b8ea6-26fd-11df-bfd4-992fa37f6226
1 file changed