Fixed expected state when using different images for depth and stencil

src/OpenGL/libGLESv2/Framebuffer.cpp

@@ -472,6 +472,16 @@ GLenum Framebuffer::completeness(int &width, int &height, int &samples)
 		}
 	}
 
+	if((egl::getClientVersion() >= 3) && depthbuffer && stencilbuffer && (depthbuffer != stencilbuffer))
+	{
+		// In the GLES 3.0 spec, section 4.4.4, Framebuffer Completeness:
+		// "The framebuffer object target is said to be framebuffer complete if all the following conditions are true:
+		//  [...]
+		//  Depth and stencil attachments, if present, are the same image.
+		//  { FRAMEBUFFER_UNSUPPORTED }"
+		return GL_FRAMEBUFFER_UNSUPPORTED;
+	}
+
 	// We need to have at least one attachment to be complete
 	if(width == -1 || height == -1)
 	{