Lights flipped on x axis flipped on Windows

[jamespohalloran]

Working fine on Mac build, but for Windows (on a macbook pro), the lights are showing up on the reverse y value based on the center of the screen. (So when the player jumps, the light goes down instead of up).

This old issue seems to accurately describe the problem:
https://m.reddit.com/r/Unity2D/comments/4cmr4w/looking_for_anyone_who_has_a_clue_what_might_be/
Although setting the settings to OpenGLCore on Windows is not always an option.

[prime31]

I don't use DirectX so I cant confirm but this line should take care of flipping the UVs. Unless you are using a different shader in which case you will just need to make sure the UV flip happens to account for DirectX being upside down.

[jamespohalloran]

Ah, ok.
The fix for me was to remove that line, and replace it with
#if UNITY_UV_STARTS_AT_TOP if (_MainTex_TexelSize.y < 0) o.uv.y = 1.0f - o.uv.y; #endif
BUT, that needs to be in the vertex shader, not the fragment shader.
This seems to align with Unity's documentation https://docs.unity3d.com/Manual/SL-PlatformDifferences.html