Alpha Testing not working

Possibly related to #59

Alpha testing does nothing and is seemingly always enabled with a cutoff value of 1. The only cause I can think of is that OutlineColor.URP has a shader error saying invalid subscript 'uv'.

It’s about this line of code

half4 FragmentAlphaTest(Varyings input) : SV_Target
{
	half4 c = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, input.uv); // error occurs here
	clip(c.a - _Cutoff);
	return 1;
}

Which is… stupid, why would Varyings not have uv, it has always had uv!? Am I crazy?!

Not sure what to do yet, Varyings is taken from #include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl" and it will have to be investigated.

[Ciubix8513]

I managed to fix this issue in my project with the following steps:

1. Create a new Outline Resources file
2. Create a blank shader graph URP unlit shader
3. Set Render shader in the created resources file to the created shader
4. Set Outline shader to Outline.URP
5. Set Outline resources of all Outline feature render features in the Universal Renderer Data to the created resources file

[CaseyHofland]

@Arvtesh I’d love to create another, very simple, PR for this, but you haven’t accepted my first one yet. Like I said before, I really like this outline implementation and I hope you’ll find the time to approve them so that it stays supported for everyone.