//==========================================================
//
// Copyright (c) Guangzhou Shixiang Technology Co.,Ltd.
// All rights reserved.
//
//==========================================================

Shader "GxrSdk/Unlit/Border"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _Color("Color",Color) = (1,1,0,1)
        _frameWidth("FrameWidth",float) = 0.03
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

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

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

            sampler2D _MainTex;
            float4 _MainTex_ST;
            float4 _Color;
            float _frameWidth;
            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = UnityObjectToClipPos(v.vertex);
                o.uv = TRANSFORM_TEX(v.uv, _MainTex);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                // sample the texture
                fixed4 col = tex2D(_MainTex, i.uv);
                
                if (i.uv.x < _frameWidth || i.uv.x > (1 - _frameWidth) 
                    || i.uv.y < _frameWidth || i.uv.y > (1- _frameWidth))
                {
                    return _Color;
                }
                else
                {
                    return col;
                }
            
                }
            ENDCG
        }
    }
}