Minimizes changes of the depth stencil buffer TRAC #12154 This patch reduces calls to SetDepthStencilSurface Signed-off-by: Nicolas Capens Signed-off-by: Daniel Koch Author: Shannon Woods git-svn-id: https://angleproject.googlecode.com/svn/trunk@261 736b8ea6-26fd-11df-bfd4-992fa37f6226