Shader "Outline/SolidUnlit"
{
    SubShader
    {
        Tags { "RenderType" = "TransparentCutout" }
        ZWrite Off
        ZTest LEqual
        Lighting Off
    	// Set up alpha blending
        Blend SrcAlpha OneMinusSrcAlpha
    	
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"
            
            struct appdata
            {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
            };

            struct v2f
            {
                float4 vertex : SV_POSITION;
                float4 projPos : TEXCOORD0;
                float2 convertedNormal : TEXCOORD1;
            };
            
            v2f vert (appdata v)
            {
                v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
			
				o.projPos = ComputeScreenPos(o.vertex);
				COMPUTE_EYEDEPTH(o.projPos.z);
			
				//o.viewNormal = COMPUTE_VIEW_NORMAL;
			
				// work out camera position to vert position
				float3 normalDir = UnityObjectToWorldNormal(v.normal);
				float3 viewDir = normalize(WorldSpaceViewDir(v.vertex));
			
				float3 upDir = float3(0.0, 1.0, 0.0);
				float3 rightDir = normalize(cross(viewDir, upDir));
				upDir = cross(rightDir, viewDir);
			
				o.convertedNormal.x = dot(rightDir, normalDir);
				o.convertedNormal.y = dot(upDir, normalDir);
                return o;
            }
            
            float4 _Color;
            float _Alpha;
 
            fixed4 frag(v2f i) : COLOR0
            {
				fixed4 output = _Color;

				output.a = output.a * _Alpha;
            	
            	clip((output.a - 0));
            	
                return output;
            	
            }
 
            ENDCG
        }
    }
}