pixel centers

[inolen]

On menus that are rendered starting at (0, 0) I'm having an issue where I see a 1 pixel line at the top of the menu across Windows / Mac / Linux platforms. From a quick look, this seems to be related to the 0.5 offset applied to each vertex coordinate generated from inside of nuklear.

I'm not a graphics buff, but it seems that applying this offset here may be causing a fragment to not be generated during rasterization as the pixel is assumed to be outside of the primitive (precision issues?). Should the 0.5 really be being applied by nuklear when generating the coordinates?

Edit: To note, I'm rendering with AA, padding spacing, borders, etc. all off and removing the offsets does indeed fix the issue I'm experiencing.

[vurtun]

Thanks for the issue. Does the problem go away if you set the menu position to (0,-0.5)? Also what happens if your nuklear window fills the complete os window?. For example for me with demo/sdl_opengl3 I fill out the complete window:

[inolen]

Wow, totally forgot to reply on this.

-0.5f doesn't do the trick, but -1.0f does.

I can make that demo fill the entire window by moving the window around. However, I didn't see a maximize button so I manually filled it out, and I can manually move the window to a negative x / y coordinate.

[inolen]

Also, could these issues be related:
#401
#409

[inolen]

Just wanted to bump this, let me know if there's any more info I can provide.

[vurtun]

Hm just a quick guess. What happens if you activate window border or increase and decrease the border width?

[inolen]

Interestingly, I just went to repo and realized I believe this only repros for me when I'm running the official NVIDIA drivers vs mesa.

Will change drivers back to NVIDIA soon soon and try to repro again.