Shader "Custom/Unlit-Line-Opaque" {
    Properties{
        _MainTex("Particle Texture", 2D) = "white" {}
        _InvFade("Soft Particles Factor", Range(0.01,3.0)) = 1.0
    }

        Category{
            Tags { "Queue" = "AlphaTest" "IgnoreProjector" = "True" "RenderType" = "Opaque" "PreviewType" = "Plane" }
            Blend One OneMinusSrcAlpha
            ColorMask RGB
            Cull Off Lighting Off

            SubShader {
                Pass {

                    CGPROGRAM
                    #pragma vertex vert
                    #pragma fragment frag
                    #pragma target 2.0
                    #pragma multi_compile_particles

                    #include "UnityCG.cginc"

                    sampler2D _MainTex;
                    fixed4 _TintColor;

                    struct appdata_t {
                        float4 vertex : POSITION;
                        fixed4 color : COLOR;
                        float2 texcoord : TEXCOORD0;
                        UNITY_VERTEX_INPUT_INSTANCE_ID
                    };

                    struct v2f {
                        float4 vertex : SV_POSITION;
                        fixed4 color : COLOR;
                        float2 texcoord : TEXCOORD0;
                        #ifdef SOFTPARTICLES_ON
                        float4 projPos : TEXCOORD1;
                        #endif
                        UNITY_VERTEX_OUTPUT_STEREO
                    };

                    float4 _MainTex_ST;

                    v2f vert(appdata_t v)
                    {
                        v2f o;
                        UNITY_SETUP_INSTANCE_ID(v);
                        UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
                        o.vertex = UnityObjectToClipPos(v.vertex);
                        #ifdef SOFTPARTICLES_ON
                        o.projPos = ComputeScreenPos(o.vertex);
                        COMPUTE_EYEDEPTH(o.projPos.z);
                        #endif
                        o.color = v.color;
                        o.texcoord = TRANSFORM_TEX(v.texcoord,_MainTex);
                        return o;
                    }

                    UNITY_DECLARE_DEPTH_TEXTURE(_CameraDepthTexture);
                    float _InvFade;

                    fixed4 frag(v2f i) : SV_Target
                    {
                        #ifdef SOFTPARTICLES_ON
                        float sceneZ = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, UNITY_PROJ_COORD(i.projPos)));
                        float partZ = i.projPos.z;
                        float fade = saturate(_InvFade * (sceneZ - partZ));
                        i.color.a *= fade;
                        #endif

                        return i.color * tex2D(_MainTex, i.texcoord) * i.color.a;
                    }
                    ENDCG
                }
            }
        }
}