Adds D3DFMT_UNKNOWN to depth stencil format conversion function.

TRAC #21819

Signed-off-by: Daniel Koch

Author:    Shannon Woods

git-svn-id: https://angleproject.googlecode.com/svn/branches/dx11proto@1349 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/utilities.cpp b/src/libGLESv2/utilities.cpp
index a3eb27d..cade2a7 100644
--- a/src/libGLESv2/utilities.cpp
+++ b/src/libGLESv2/utilities.cpp
@@ -1125,6 +1125,8 @@
         return GL_DEPTH_COMPONENT16;
       case D3DFMT_D24S8:
         return GL_DEPTH24_STENCIL8_OES;
+      case D3DFMT_UNKNOWN:
+        return GL_NONE;
       default:
         UNREACHABLE();
     }