Simple Gradient Shader

BasicGradient.shader

Shader "Custom/BasicGradient"
{
	Properties
	{
		_TopColor ("Top Color", Color) = (1, 1, 1, 1)
		_BottomColor ("Bottom Color", Color) = (1, 1, 1, 1)
		_RampTex ("Ramp Texture", 2D) = "white" {}
	}

	SubShader
	{
		Pass
		{
			Blend SrcAlpha OneMinusSrcAlpha

			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag

			struct vertexIn {
				float4 pos : POSITION;
				float2 uv : TEXCOORD0;
			};

			struct v2f {
				float4 pos : SV_POSITION;
				float2 uv : TEXCOORD0;
			};

			v2f vert(vertexIn input)
			{
				v2f output;

				output.pos = mul(UNITY_MATRIX_MVP, input.pos);
				output.uv = input.uv;

				return output;
			}

			fixed4 _TopColor, _BottomColor;
			sampler2D _RampTex;

			fixed4 frag(v2f input) : COLOR
			{
				return lerp(_BottomColor, _TopColor, tex2D(_RampTex, input.uv).a);
			}
			ENDCG
		}
	}
}