Bug Hunt: mglTest Issues

[cjoynes]

All issue found in 2021b

• mglTestAlignment: unrecognized function or variable 'textTexture'

Error in mglTextDraw (line 44)
mglDeleteTexture(textTexture);
Error in mglTestAlignment (line 27)
mglTextDraw('Visual angle coordinates',[0 1]);

• mglTestGamma: slidebar doesn't update gamma value
• mglTestStencil: crashes Matlab
• mglTestTexMulti: mgl window doesn’t show anything but the code prints out bunch of numbers (I guess some lines are printing out the number in mglSocketWrite code)
• mglTestText: Doesn't print out anything on the mgl window and also stopped to respond

[benjamin-heasly]

I think these are resolved now, but I'll leave open until we can retest.

[justingardner]

These seem basically resolved. So I will close, but mglTestStencil only draws the inner points - need to check on that. And mglTestText shows text flipped. Will open separate issues to track those.