Implement gl_PointSize point sprite emulation using D3D11 geometry shaders.

TRAC #22412

Signed-off-by: Nicolas Capens
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1786 736b8ea6-26fd-11df-bfd4-992fa37f6226
8 files changed