J instead of I

A broken image - artefact,
I follow with my eye,
Unwanted outcome, a mistake,
An error of a try.

I think again, what could it be,
The shader, the technique?
Or maybe change in cpp,
Perhaps the matrix is oblique!?

Or maybe drivers are at fault,
You know those driver guys,
But such a thought is last resort,
I facepalm, rub my eyes.

I look again, it has to work,
I comment bits around,
I try again, I trace, debug,
In search for stable ground.

And then I see it, pesky “i”,
Where “j” I meant to write,
A stupid typo, found it, sigh,
I fix it, run it, is it right?

A broken image - artefact,
I follow with my eye,
Unwanted outcome, a mistake,
An error of a try.