Shader "Custom/Gradient" {
Properties {
_Color1 ("Bottom Left", Color) = (1,1,1,1)
_Color2 ("Bottom Right", Color) = (1,1,1,1)
_Color3 ("Top Left", Color) = (1,1,1,1)
_Color4 ("Top Right", Color) = (1,1,1,1)
_Scale ("Scale", Float) = 1
_MainTex ("Base (RGB)", 2D) = "white" {}
}

SubShader {
Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
Blend SrcAlpha OneMinusSrcAlpha
Cull Off
ZWrite Off
LOD 100


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

fixed4 _Color1;
fixed4 _Color2;
fixed4 _Color3;
fixed4 _Color4;
fixed _Scale;

sampler2D _MainTex;

struct v2f {
float4 pos : SV_POSITION;
fixed4 col : COLOR;
};

v2f vert (appdata_full v)
{
v2f o;
o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
fixed x = v.vertex.x;
fixed4 grad = lerp(_Color1,_Color2, v.vertex.x * _Scale);
fixed4 grad1 = lerp(_Color3,_Color4, v.vertex.x * _Scale);
fixed4 grad2 = lerp(grad, grad1, step(0.5,v.vertex.y));
o.col = grad2;
return o;
}


float4 frag (v2f i) : COLOR {
float4 c = i.col;
c.a = i.col.a;
return c;
}
ENDCG
}
}
}