// Made with Amplify Shader Editor
// Available at the Unity Asset Store - http://u3d.as/y3X 
Shader "SyntyStudios/Triplanar"
{
	Properties
	{
		_Overlay("Overlay", 2D) = "white" {}
		_FallOff("FallOff", Float) = 0
		_Tiling("Tiling", Float) = 0
		_Emission("Emission", 2D) = "white" {}
		_Texture("Texture", 2D) = "white" {}
		_EmissionColor("EmissionColor", Color) = (0,0,0,0)
		_DirtAmount("DirtAmount", Range( 0.5 , 1.2)) = 1
		[HideInInspector] _texcoord( "", 2D ) = "white" {}
		[HideInInspector] __dirty( "", Int ) = 1
	}

	SubShader
	{
		Tags{ "RenderType" = "Opaque"  "Queue" = "Geometry+0" "IsEmissive" = "true"  }
		Cull Back
		CGINCLUDE
		#include "UnityPBSLighting.cginc"
		#include "Lighting.cginc"
		#pragma target 3.0
		#ifdef UNITY_PASS_SHADOWCASTER
			#undef INTERNAL_DATA
			#undef WorldReflectionVector
			#undef WorldNormalVector
			#define INTERNAL_DATA half3 internalSurfaceTtoW0; half3 internalSurfaceTtoW1; half3 internalSurfaceTtoW2;
			#define WorldReflectionVector(data,normal) reflect (data.worldRefl, half3(dot(data.internalSurfaceTtoW0,normal), dot(data.internalSurfaceTtoW1,normal), dot(data.internalSurfaceTtoW2,normal)))
			#define WorldNormalVector(data,normal) fixed3(dot(data.internalSurfaceTtoW0,normal), dot(data.internalSurfaceTtoW1,normal), dot(data.internalSurfaceTtoW2,normal))
		#endif
		struct Input
		{
			float2 uv_texcoord;
			float3 worldPos;
			float3 worldNormal;
			INTERNAL_DATA
		};

		uniform sampler2D _Texture;
		uniform float4 _Texture_ST;
		uniform sampler2D _Overlay;
		uniform float _Tiling;
		uniform float _FallOff;
		uniform float _DirtAmount;
		uniform sampler2D _Emission;
		uniform float4 _Emission_ST;
		uniform float4 _EmissionColor;


		inline float4 TriplanarSamplingCF( sampler2D topTexMap, sampler2D midTexMap, sampler2D botTexMap, float3 worldPos, float3 worldNormal, float falloff, float tilling, float3 index )
		{
			float3 projNormal = ( pow( abs( worldNormal ), falloff ) );
			projNormal /= projNormal.x + projNormal.y + projNormal.z;
			float3 nsign = sign( worldNormal );
			float negProjNormalY = max( 0, projNormal.y * -nsign.y );
			projNormal.y = max( 0, projNormal.y * nsign.y );
			half4 xNorm; half4 yNorm; half4 yNormN; half4 zNorm;
			xNorm = ( tex2D( midTexMap, tilling * worldPos.zy * float2( nsign.x, 1.0 ) ) );
			yNorm = ( tex2D( topTexMap, tilling * worldPos.xz * float2( nsign.y, 1.0 ) ) );
			yNormN = ( tex2D( botTexMap, tilling * worldPos.xz * float2( nsign.y, 1.0 ) ) );
			zNorm = ( tex2D( midTexMap, tilling * worldPos.xy * float2( -nsign.z, 1.0 ) ) );
			return xNorm * projNormal.x + yNorm * projNormal.y + yNormN * negProjNormalY + zNorm * projNormal.z;
		}


		void surf( Input i , inout SurfaceOutputStandard o )
		{
			o.Normal = float3(0,0,1);
			float2 uv_Texture = i.uv_texcoord * _Texture_ST.xy + _Texture_ST.zw;
			float3 ase_worldPos = i.worldPos;
			float3 ase_worldNormal = WorldNormalVector( i, float3( 0, 0, 1 ) );
			float4 triplanar1 = TriplanarSamplingCF( _Overlay, _Overlay, _Overlay, ase_worldPos, ase_worldNormal, _FallOff, _Tiling, float3(0,0,0) );
			float4 temp_cast_0 = (_DirtAmount).xxxx;
			float4 clampResult17 = clamp( triplanar1 , temp_cast_0 , float4( 1,1,1,0 ) );
			o.Albedo = ( tex2D( _Texture, uv_Texture ) * clampResult17 ).rgb;
			float2 uv_Emission = i.uv_texcoord * _Emission_ST.xy + _Emission_ST.zw;
			o.Emission = ( tex2D( _Emission, uv_Emission ) * _EmissionColor ).rgb;
			o.Alpha = 1;
		}

		ENDCG
		CGPROGRAM
		#pragma surface surf Standard keepalpha fullforwardshadows 

		ENDCG
		Pass
		{
			Name "ShadowCaster"
			Tags{ "LightMode" = "ShadowCaster" }
			ZWrite On
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma target 3.0
			#pragma multi_compile_shadowcaster
			#pragma multi_compile UNITY_PASS_SHADOWCASTER
			#pragma skip_variants FOG_LINEAR FOG_EXP FOG_EXP2
			#include "HLSLSupport.cginc"
			#if ( SHADER_API_D3D11 || SHADER_API_GLCORE || SHADER_API_GLES3 || SHADER_API_METAL || SHADER_API_VULKAN )
				#define CAN_SKIP_VPOS
			#endif
			#include "UnityCG.cginc"
			#include "Lighting.cginc"
			#include "UnityPBSLighting.cginc"
			struct v2f
			{
				V2F_SHADOW_CASTER;
				float2 customPack1 : TEXCOORD1;
				float4 tSpace0 : TEXCOORD2;
				float4 tSpace1 : TEXCOORD3;
				float4 tSpace2 : TEXCOORD4;
				UNITY_VERTEX_INPUT_INSTANCE_ID
			};
			v2f vert( appdata_full v )
			{
				v2f o;
				UNITY_SETUP_INSTANCE_ID( v );
				UNITY_INITIALIZE_OUTPUT( v2f, o );
				UNITY_TRANSFER_INSTANCE_ID( v, o );
				Input customInputData;
				float3 worldPos = mul( unity_ObjectToWorld, v.vertex ).xyz;
				fixed3 worldNormal = UnityObjectToWorldNormal( v.normal );
				fixed3 worldTangent = UnityObjectToWorldDir( v.tangent.xyz );
				fixed tangentSign = v.tangent.w * unity_WorldTransformParams.w;
				fixed3 worldBinormal = cross( worldNormal, worldTangent ) * tangentSign;
				o.tSpace0 = float4( worldTangent.x, worldBinormal.x, worldNormal.x, worldPos.x );
				o.tSpace1 = float4( worldTangent.y, worldBinormal.y, worldNormal.y, worldPos.y );
				o.tSpace2 = float4( worldTangent.z, worldBinormal.z, worldNormal.z, worldPos.z );
				o.customPack1.xy = customInputData.uv_texcoord;
				o.customPack1.xy = v.texcoord;
				TRANSFER_SHADOW_CASTER_NORMALOFFSET( o )
				return o;
			}
			fixed4 frag( v2f IN
			#if !defined( CAN_SKIP_VPOS )
			, UNITY_VPOS_TYPE vpos : VPOS
			#endif
			) : SV_Target
			{
				UNITY_SETUP_INSTANCE_ID( IN );
				Input surfIN;
				UNITY_INITIALIZE_OUTPUT( Input, surfIN );
				surfIN.uv_texcoord = IN.customPack1.xy;
				float3 worldPos = float3( IN.tSpace0.w, IN.tSpace1.w, IN.tSpace2.w );
				fixed3 worldViewDir = normalize( UnityWorldSpaceViewDir( worldPos ) );
				surfIN.worldPos = worldPos;
				surfIN.worldNormal = float3( IN.tSpace0.z, IN.tSpace1.z, IN.tSpace2.z );
				surfIN.internalSurfaceTtoW0 = IN.tSpace0.xyz;
				surfIN.internalSurfaceTtoW1 = IN.tSpace1.xyz;
				surfIN.internalSurfaceTtoW2 = IN.tSpace2.xyz;
				SurfaceOutputStandard o;
				UNITY_INITIALIZE_OUTPUT( SurfaceOutputStandard, o )
				surf( surfIN, o );
				#if defined( CAN_SKIP_VPOS )
				float2 vpos = IN.pos;
				#endif
				SHADOW_CASTER_FRAGMENT( IN )
			}
			ENDCG
		}
	}
	Fallback "Diffuse"
	CustomEditor "ASEMaterialInspector"
}
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