Framebuffer Layer query

Added implementation for querying
GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LAYER in
GetFramebufferAttachmentParameteriv.

Change-Id: Ib25ba51bf68c9d979f80cc65ba7059366b5f1ae4
Reviewed-on: https://swiftshader-review.googlesource.com/3541
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>
diff --git a/src/OpenGL/libGLESv2/Renderbuffer.cpp b/src/OpenGL/libGLESv2/Renderbuffer.cpp
index 3d8cc3e..9894e57 100644
--- a/src/OpenGL/libGLESv2/Renderbuffer.cpp
+++ b/src/OpenGL/libGLESv2/Renderbuffer.cpp
@@ -332,6 +332,11 @@
 	return mInstance->getHeight();
 }
 
+GLint Renderbuffer::getLayer() const
+{
+	return mInstance->getLayer();
+}
+
 GLenum Renderbuffer::getFormat() const
 {
 	return mInstance->getFormat();