Reshade Timers need help clearing things up.

This works well untill The game FPS Falls Bellow 60 Then I lose sync and the order is reverse. I get this problem.

uniform int framecount < source = "framecount"; >;
if ((framecount % 2) == 1)//even//odd
{
color =Left;
}
else
{
color = Right;
}

So I tried this.
This Works until the game FPS slows down. It seems to me the timer slows down with the game....... This is a problem when trying to keep time that or I am doing something wrong.

uniform float timer < source = "timer"; >;
float FT = 16.7;//frametime for 60FPS more or less
if (int(timer/FT) & 1)
{
color =Left;
}
else
{
color = Right;
}

So I have been trying to do Frame sequential. But, I have a problem keeping time. Also would it be hard to implement Vblank syncing in to reshade? If there already a way I would love to know how to sync to Vblank.

Any help would be nice.

Thank you.......

Confirms my tests from earlier. A few months ago I tried some temporal AA fix for MXAO, because the depth buffer of Witcher 3 appears to be "vibrating" with TAA on. It's a shift from 1 pixel diagonally every second frame. Tried to reverse this behavior by reversing the shift every second frame but this didn't keep pace but sometimes doubled the shift because it moved the wrong frames into the wrong direction.