Add logic to compute the size and offsets of interface blocks stored in shared (packed) and standard layouts. The shared layout follows the standard HLSL packing rules for optimal shader performance. TRAC #22930 Signed-off-by: Nicolas Capens Signed-off-by: Geoff Lang Author: Jamie Madill git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2343 736b8ea6-26fd-11df-bfd4-992fa37f6226