Additive Clipsafe shader

AdditiveClipsafe.shader

// Upgrade NOTE: replaced 'PositionFog()' with multiply of UNITY_MATRIX_MVP by position
// Upgrade NOTE: replaced 'V2F_POS_FOG' with 'float4 pos : SV_POSITION'

// Upgrade NOTE: replaced 'glstate.matrix.modelview[0]' with 'UNITY_MATRIX_MV'

// By Daniel Brauer, with minor changes to make it additive.

Shader "Particles/Additive Clipsafe"
{
	Properties
	{
		_TintColor ("Tint Color", Color) = (0.5,0.5,0.5,0.5)
		_MainTex ("Particle Texture", 2D) = "white" {}
		_FadeDistance ("Fade Start Distance", float) = 0.5
		_NearClip ("Near Clip Distance", float) = 0.3
	}

	Category
	{
		Tags {"Queue" = "Transparent"}
		Blend SrcAlpha One
		AlphaTest Greater .01
		ColorMask RGB
		Cull Off
		Lighting Off
		ZWrite Off
		Fog {Color (0,0,0,1)}

		SubShader
		{
			Pass
			{
				CGPROGRAM
// Upgrade NOTE: excluded shader from Xbox360; has structs without semantics (struct v2f members uv,color)
#pragma exclude_renderers xbox360
				#pragma vertex vert
				#pragma fragment frag
				#pragma multi_compile_builtin
				#pragma fragmentoption ARB_fog_exp2
				#pragma fragmentoption ARB_precision_hint_fastest
				#include "UnityCG.cginc"

				uniform float4 _TintColor;
				uniform float4 _MainTex_ST;
				uniform float _NearClip, _FadeDistance;

				struct appdata_vert
				{
					float4 vertex : POSITION;
					float4 texcoord : TEXCOORD0;
					float4 color : COLOR;
				};

				uniform sampler2D _MainTex;

				struct v2f
				{
					float4 pos : SV_POSITION;
					float2  uv;
					float4 color;
				};

				v2f vert (appdata_vert v)
				{
					v2f o;
					o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
					o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
					float4 viewPos = mul(UNITY_MATRIX_MV, v.vertex);
					float alpha = (-viewPos.z - _NearClip) / _FadeDistance;
					clamp(alpha, 0, 1);
					o.color = float4(v.color.rgb, v.color.a * alpha);
					o.color *= _TintColor;
					return o;
				}

				float4 frag (v2f i) : COLOR
				{
					half4 texcol = tex2D( _MainTex, i.uv );

					return texcol * i.color;
				}
				ENDCG
			}
		}
	}
	
	Fallback "Particles/Additive"
}