Only advertise postSubBuffer extension if we can actually present less than the whole buffer.

This is not available in D3D11, though it is added in D3D11.1.

TRAC #22506

Signed-off-by: Geoff Lang
Signed-off-by: Nicolas Capens
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1892 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/renderer/Renderer.h b/src/libGLESv2/renderer/Renderer.h
index f59e743..40bc985 100644
--- a/src/libGLESv2/renderer/Renderer.h
+++ b/src/libGLESv2/renderer/Renderer.h
@@ -167,6 +167,7 @@
     virtual float getTextureMaxAnisotropy() const = 0;
     virtual bool getShareHandleSupport() const = 0;
     virtual bool getDerivativeInstructionSupport() const = 0;
+    virtual bool getPostSubBufferSupport() const = 0;
 
     virtual int getMajorShaderModel() const = 0;
     virtual float getMaxPointSize() const = 0;