Shader "Custom/Triplanar"
{
    Properties
    {
        _HighlightedColor ("Circle Highlighed Color", Color) = (1,1,1,1)
		_NormalColor("Circle Color", Color) = (1,1,1,1)
        _WallTex ("Wall texture", 2D) = "white" {}
		_FloorTex ("Floor texture", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 200

        CGPROGRAM
// Upgrade NOTE: excluded shader from DX11, OpenGL ES 2.0 because it uses unsized arrays
#pragma exclude_renderers d3d11 gles
        // Physically based Standard lighting model, and enable shadows on all light types
        #pragma surface surf Standard fullforwardshadows

        // Use shader model 3.0 target, to get nicer looking lighting
        #pragma target 3.0

        sampler2D _WallTex;
		sampler2D _FloorTex;

        struct Input
        {
			float3 worldPos;
			float3 worldNormal;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _HighlightedColor;
		fixed4 _NormalColor;

		//int _ArgCount = 0;
		//float4 _Positions[100];
		//float _Radii[100];


        // Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
        // See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
        // #pragma instancing_options assumeuniformscaling
        UNITY_INSTANCING_BUFFER_START(Props)
            // put more per-instance properties here
        UNITY_INSTANCING_BUFFER_END(Props)

			//credit to @minionsart on twitter for her triplanar shading implementation
        void surf (Input IN, inout SurfaceOutputStandard o)
        {
			float3 xCol = tex2D(_WallTex, IN.worldPos.yz);
			float3 yCol = tex2D(_FloorTex, IN.worldPos.xz);
			float3 zCol = tex2D(_WallTex, IN.worldPos.xy);

			//for (int i = 0; i < _ArgCount; i++)
			//{
			//	float distanceToCircle = length(IN.worldPos.xz - _Positions[i].xz);
			//	yCol += (distanceToCircle < _Radii[i]) * _NormalColor * distanceToCircle / _Radii[i];
			//}

			float3 blendedNormal = saturate(pow(IN.worldNormal*1.4, 4.));

			fixed3 endColor = lerp(zCol, yCol, blendedNormal.y);
			endColor = lerp(endColor, xCol, blendedNormal.x);
            o.Albedo = float3(1.0f,1.0f,1.0f);


            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;
            o.Alpha = 1.0;
        }
        ENDCG
    }
    FallBack "Diffuse"
}