Shader Parse error

Questions & Answers
1

I’ve never looked into shading much, and I really only need it for one aspect of my project: a projector.

I’m following along with a guide and copied the code into VS, but it produced an error:

	Shader error in 'Projector/AdditiveTint': Parse error: syntax error at line 13	Solution 'Battle Sandbox2' ‎(1 project)		0

The 0 at the end is a little disconcerting as that’s supposedly the line number for the error, so a bit of a discrepancy there…

Here’s the code in question:

Shader "Projector/AdditiveTint" {
	Properties{
		_Color("Tint Color", Color) = (1,1,1,1)
		_Attenuation("Falloff", Range(0.0, 1.0)) = 1.0
		_ShadowTex("Cookie", 2D) = "gray" {}
	}
		Subshader{
		Tags{ "Queue" = "Transparent" }
		Pass{
		ZWrite Off
		ColorMask RGB
		Blend SrcAlpha One // Additive blending
		Offset - 1, -1
		
		CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"

	struct v2f {
		float4 uvShadow : TEXCOORD0;
		float4 pos : SV_POSITION;
	};

	float4x4 unity_Projector;
	float4x4 unity_ProjectorClip;

	v2f vert(float4 vertex : POSITION)
	{
		v2f o;
		o.pos = mul(UNITY_MATRIX_MVP, vertex);
		o.uvShadow = mul(unity_Projector, vertex);
		return o;
	}

	sampler2D _ShadowTex;
	fixed4 _Color;
	float _Attenuation;

	fixed4 frag(v2f i) : SV_Target
	{
		// Apply alpha mask
		fixed4 texCookie = tex2Dproj(_ShadowTex, UNITY_PROJ_COORD(i.uvShadow));
	fixed4 outColor = _Color * texCookie.a;
	// Attenuation
	float depth = i.uvShadow.z; // [-1 (near), 1 (far)]
	return outColor * clamp(1.0 - abs(depth) + _Attenuation, 0.0, 1.0);
	}
		ENDCG
	}
	}
}

Like I said, I don’t work with shaders and I really only understand the general concept. Since the cause of the error appears to vary somewhat, I’m at a loss. The most I could do was check to see if there were an even number of braces, which there were.

Thanks.

2

When I try this on MacOS. I get this error message:

Parse error: syntax error, unexpected ‘-’, expecting TVAL_VARREF or TVAL_NUMBER at line 13

Changing this line:

Offset - 1, -1
to

Offset -1, -1

e.g. remove the space between the ‘-’ and the ‘1’. Makes the shader compile with no errors.

3

In line 10 you have Offset - 1, -1 which has a space too much. It should be Offset -1, -1, Offset - 1, -1 should be Offset -1, -1 (there is a space too much)