Add a helper method to gl::Framebuffer to check if we are drawing to color attachment 0 only.

TRAC #22898

Signed-off-by: Geoff Lang
Signed-off-by: Shannon Woods
Author: Jamie Madill

git-svn-id: https://angleproject.googlecode.com/svn/branches/es3proto@2263 736b8ea6-26fd-11df-bfd4-992fa37f6226
diff --git a/src/libGLESv2/Framebuffer.h b/src/libGLESv2/Framebuffer.h
index 66acdc4..b54e008 100644
--- a/src/libGLESv2/Framebuffer.h
+++ b/src/libGLESv2/Framebuffer.h
@@ -68,6 +68,7 @@
     bool hasEnabledColorAttachment() const;
     bool hasStencil() const;
     int getSamples() const;
+    bool usingExtendedDrawBuffers() const;
 
     virtual GLenum completeness() const;