Passing Variables "flots" from the fragment shader to the vertex shader

OpenGL OpenGL: Basic Coding
1

Hi,

Is it possible to pass variables ''floats" from the fragment shader to the vertex shader ?

Thank you.

2

It’s not possible to pass anything “up” the rendering pipeline. How could it be? That part of the pipeline has finished; it can’t start up again.

Now, it’s possible for a fragment shader to write data to a buffer texture, from which a later rendering operation reads. But that’s two separate rendering operations.