UnityShaderBook/Assets/Shaders/Extra/TestVertexShader.shader

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

// Upgrade NOTE: replaced '_World2Object' with 'unity_WorldToObject'

// Upgrade NOTE: replaced '_Object2World' with 'unity_ObjectToWorld'

Shader "Unlit/TestVertexShader"
{
	Properties
	{
		_MainTex ("Texture", 2D) = "white" {}
		_Param1 ("y2",Float) = 1.0
		_Param2 ("weight",Float) = 1.0
		_Param3 ("Param3",Float) = 1.0
	}
	SubShader
	{
		Tags { "RenderType"="Opaque" }
		LOD 100

		Pass
		{
			Cull Off
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			
			#include "UnityCG.cginc"

			struct appdata
			{
				float4 vertex : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f
			{
				float2 uv : TEXCOORD0;
				float4 srcPos : TEXCOORD1;
				float4 vertex : SV_POSITION;
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;
			float _Param1;
			float _Param2;
			float _Param3;
			
			v2f vert(appdata v){
				v2f o;
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.srcPos = ComputeScreenPos(o.vertex);
				o.uv = v.uv;
				return o;
			}

			fixed4 frag(v2f i) : SV_target{
				float2 wcoord = (i.srcPos.xy/i.srcPos.w);
				//float a = lerp(wcoord.x,_Param1,_Param2);
				float r = smoothstep(_Param1,_Param2,wcoord.x);
				//float g = smoothstep(0.5,0.8,wcoord.y);
				return fixed4(r,0.0,0.0,1.0);
			}
			ENDCG
		}
	}
}