Flip Normal Map green channel checkbox on Normal Map Node

Hi! As you know, OpenGL normal maps and DirectX normal maps are different, inasmuch as their green channel is inverted. Thus, if you use a DX normal map in Blender, you get wrong normal direction.

Fixing this is of course easy: you can, for example, take a RGB Curves node, select the green channel and flip the graph. Or you can use a Separate RGB node, etc.

However, what would be even more awesome would be having a checkbox to flip the green channel on the node itself. Something like the image I have attached.

In that way, you could just check the checkbox and switch the channel. It's a small thing, but it would improve two things:

• relieve many people of a boring step when adding textures
• actually make many people aware of this, in case they aren't

Hope this can be implemented!