Support glTexSubImage2D.

TRAC #1167

Signed-off-by: Shannon Woods
Signed-off-by: Daniel Koch

Author:    Andrew Lewycky <andrew.lewycky@transgaming.com>

git-svn-id: http://angleproject.googlecode.com/svn/trunk@18 736b8ea6-26fd-11df-bfd4-992fa37f6226
5 files changed