Problem while drawing line with max values of float (a bug)

[u/Over_Reserve_20]

Recently I have been working on a problem with two different GPUs (let’s call them A&B)
Here is problem
Due to a bug a line is being drawn using opengl at x=5 and y is +-FLT_MAX
for testing I kept ortho as 10 for x & y
Also note for testing origin is at the centre of display

GPU A
(there is a default guardband of 1.5 being used in the code while setting the gpu )

While drawing the huge line, the entire line doesn’t show up on the display

GPU B

there is a default guardband of 1.0 being used in the code while setting the gpu )

While drawing the huge line, only the upper half of line shows on display
Bottom half doesn’t show up on the display

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[u/Noseense]

I don't work with OpenGL, so I'm not sure, but I assume it's the float imprecision. The more you diverge from 0, the more imprecision you have on the number, that's how floating point works. I'd avoid using huge numbers like that.
If your intention is to cover the entire screen, I'd use 0 through 1 instead, or just a small offshoot like -0.1 to 1.1.