// Made with Amplify Shader Editor
// Available at the Unity Asset Store - http://u3d.as/y3X 
Shader "Polygonmaker/Ice"
{
	Properties
	{
		_Color("Main Color, Opacity (Alpha)", Color) = (1,1,1,0)
		_MainTex("Diffuse", 2D) = "white" {}
		_Glossiness1("Opacity Intensity", Range( 0 , 2)) = 1
		_MetallicGlossMap("Metallic (R), AO (G), Gloss (Alpha)", 2D) = "black" {}
		_OcclusionMap("AO (G)", 2D) = "black" {}
		_Glossiness("Glossiness Intensity", Range( 0 , 2)) = 1
		_MetallicIntensity("Metallic Intensity", Range( 0 , 2)) = 1
		_BumpMap("Normal", 2D) = "bump" {}
		_EmissionMap("Emission", 2D) = "white" {}
		[HDR]_EmissionColor("Emission Color", Color) = (0,0,0,0)
		[HDR]_Transmission("Transmission", Color) = (0,0,0,0)
		_RefractionIntensity("Refraction Intensity", Range( 0 , 2)) = 1
		[Header(Refraction)]
		_ChromaticAberration("Chromatic Aberration", Range( 0 , 0.3)) = 0.1
		[HideInInspector] _texcoord( "", 2D ) = "white" {}
		[HideInInspector] __dirty( "", Int ) = 1
	}

	SubShader
	{
		Tags{ "RenderType" = "Custom"  "Queue" = "Transparent+0" "IsEmissive" = "true"  }
		Cull Back
		ZWrite On
		Blend SrcAlpha OneMinusSrcAlpha
		
		GrabPass{ }
		CGINCLUDE
		#include "UnityPBSLighting.cginc"
		#include "Lighting.cginc"
		#pragma target 3.0
		#pragma multi_compile _ALPHAPREMULTIPLY_ON
		struct Input
		{
			float2 uv_texcoord;
			float4 screenPos;
			float3 worldPos;
		};

		struct SurfaceOutputStandardCustom
		{
			half3 Albedo;
			half3 Normal;
			half3 Emission;
			half Metallic;
			half Smoothness;
			half Occlusion;
			half Alpha;
			half3 Transmission;
		};

		uniform sampler2D _BumpMap;
		uniform float4 _BumpMap_ST;
		uniform float4 _Color;
		uniform sampler2D _MainTex;
		uniform float4 _MainTex_ST;
		uniform sampler2D _EmissionMap;
		uniform float4 _EmissionMap_ST;
		uniform float4 _EmissionColor;
		uniform sampler2D _MetallicGlossMap;
		SamplerState sampler_MetallicGlossMap;
		uniform float4 _MetallicGlossMap_ST;
		uniform float _MetallicIntensity;
		uniform float _Glossiness;
		uniform sampler2D _OcclusionMap;
		SamplerState sampler_OcclusionMap;
		uniform float4 _OcclusionMap_ST;
		uniform float4 _Transmission;
		uniform float _Glossiness1;
		SamplerState sampler_MainTex;
		uniform sampler2D _GrabTexture;
		uniform float _ChromaticAberration;
		uniform float _RefractionIntensity;

		inline half4 LightingStandardCustom(SurfaceOutputStandardCustom s, half3 viewDir, UnityGI gi )
		{
			half3 transmission = max(0 , -dot(s.Normal, gi.light.dir)) * gi.light.color * s.Transmission;
			half4 d = half4(s.Albedo * transmission , 0);

			SurfaceOutputStandard r;
			r.Albedo = s.Albedo;
			r.Normal = s.Normal;
			r.Emission = s.Emission;
			r.Metallic = s.Metallic;
			r.Smoothness = s.Smoothness;
			r.Occlusion = s.Occlusion;
			r.Alpha = s.Alpha;
			return LightingStandard (r, viewDir, gi) + d;
		}

		inline void LightingStandardCustom_GI(SurfaceOutputStandardCustom s, UnityGIInput data, inout UnityGI gi )
		{
			#if defined(UNITY_PASS_DEFERRED) && UNITY_ENABLE_REFLECTION_BUFFERS
				gi = UnityGlobalIllumination(data, s.Occlusion, s.Normal);
			#else
				UNITY_GLOSSY_ENV_FROM_SURFACE( g, s, data );
				gi = UnityGlobalIllumination( data, s.Occlusion, s.Normal, g );
			#endif
		}

		inline float4 Refraction( Input i, SurfaceOutputStandardCustom o, float indexOfRefraction, float chomaticAberration ) {
			float3 worldNormal = o.Normal;
			float4 screenPos = i.screenPos;
			#if UNITY_UV_STARTS_AT_TOP
				float scale = -1.0;
			#else
				float scale = 1.0;
			#endif
			float halfPosW = screenPos.w * 0.5;
			screenPos.y = ( screenPos.y - halfPosW ) * _ProjectionParams.x * scale + halfPosW;
			#if SHADER_API_D3D9 || SHADER_API_D3D11
				screenPos.w += 0.00000000001;
			#endif
			float2 projScreenPos = ( screenPos / screenPos.w ).xy;
			float3 worldViewDir = normalize( UnityWorldSpaceViewDir( i.worldPos ) );
			float3 refractionOffset = ( indexOfRefraction - 1.0 ) * mul( UNITY_MATRIX_V, float4( worldNormal, 0.0 ) ) * ( 1.0 - dot( worldNormal, worldViewDir ) );
			float2 cameraRefraction = float2( refractionOffset.x, refractionOffset.y );
			float4 redAlpha = tex2D( _GrabTexture, ( projScreenPos + cameraRefraction ) );
			float green = tex2D( _GrabTexture, ( projScreenPos + ( cameraRefraction * ( 1.0 - chomaticAberration ) ) ) ).g;
			float blue = tex2D( _GrabTexture, ( projScreenPos + ( cameraRefraction * ( 1.0 + chomaticAberration ) ) ) ).b;
			return float4( redAlpha.r, green, blue, redAlpha.a );
		}

		void RefractionF( Input i, SurfaceOutputStandardCustom o, inout half4 color )
		{
			#ifdef UNITY_PASS_FORWARDBASE
			float2 uv_BumpMap = i.uv_texcoord * _BumpMap_ST.xy + _BumpMap_ST.zw;
			float3 tex2DNode4 = UnpackNormal( tex2D( _BumpMap, uv_BumpMap ) );
			color.rgb = color.rgb + Refraction( i, o, ( tex2DNode4 * _RefractionIntensity ).x, _ChromaticAberration ) * ( 1 - color.a );
			color.a = 1;
			#endif
		}

		void surf( Input i , inout SurfaceOutputStandardCustom o )
		{
			o.Normal = float3(0,0,1);
			float2 uv_BumpMap = i.uv_texcoord * _BumpMap_ST.xy + _BumpMap_ST.zw;
			float3 tex2DNode4 = UnpackNormal( tex2D( _BumpMap, uv_BumpMap ) );
			o.Normal = tex2DNode4;
			float2 uv_MainTex = i.uv_texcoord * _MainTex_ST.xy + _MainTex_ST.zw;
			float4 tex2DNode1 = tex2D( _MainTex, uv_MainTex );
			o.Albedo = ( _Color * tex2DNode1 ).rgb;
			float2 uv_EmissionMap = i.uv_texcoord * _EmissionMap_ST.xy + _EmissionMap_ST.zw;
			o.Emission = ( tex2D( _EmissionMap, uv_EmissionMap ) * _EmissionColor ).rgb;
			float2 uv_MetallicGlossMap = i.uv_texcoord * _MetallicGlossMap_ST.xy + _MetallicGlossMap_ST.zw;
			float4 tex2DNode5 = tex2D( _MetallicGlossMap, uv_MetallicGlossMap );
			o.Metallic = ( tex2DNode5.r * _MetallicIntensity );
			o.Smoothness = ( tex2DNode5.a * _Glossiness );
			float2 uv_OcclusionMap = i.uv_texcoord * _OcclusionMap_ST.xy + _OcclusionMap_ST.zw;
			o.Occlusion = tex2D( _OcclusionMap, uv_OcclusionMap ).g;
			o.Transmission = _Transmission.rgb;
			float clampResult17 = clamp( ( _Color.a * _Glossiness1 * tex2DNode1.a ) , 0.0 , 1.0 );
			o.Alpha = clampResult17;
			o.Normal = o.Normal + 0.00001 * i.screenPos * i.worldPos;
		}

		ENDCG
		CGPROGRAM
		#pragma surface surf StandardCustom keepalpha finalcolor:RefractionF fullforwardshadows exclude_path:deferred 

		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_GLES || SHADER_API_GLES3 || SHADER_API_METAL || SHADER_API_VULKAN )
				#define CAN_SKIP_VPOS
			#endif
			#include "UnityCG.cginc"
			#include "Lighting.cginc"
			#include "UnityPBSLighting.cginc"
			sampler3D _DitherMaskLOD;
			struct v2f
			{
				V2F_SHADOW_CASTER;
				float2 customPack1 : TEXCOORD1;
				float3 worldPos : TEXCOORD2;
				float4 screenPos : TEXCOORD3;
				float4 tSpace0 : TEXCOORD4;
				float4 tSpace1 : TEXCOORD5;
				float4 tSpace2 : TEXCOORD6;
				UNITY_VERTEX_INPUT_INSTANCE_ID
				UNITY_VERTEX_OUTPUT_STEREO
			};
			v2f vert( appdata_full v )
			{
				v2f o;
				UNITY_SETUP_INSTANCE_ID( v );
				UNITY_INITIALIZE_OUTPUT( v2f, o );
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO( o );
				UNITY_TRANSFER_INSTANCE_ID( v, o );
				Input customInputData;
				float3 worldPos = mul( unity_ObjectToWorld, v.vertex ).xyz;
				half3 worldNormal = UnityObjectToWorldNormal( v.normal );
				half3 worldTangent = UnityObjectToWorldDir( v.tangent.xyz );
				half tangentSign = v.tangent.w * unity_WorldTransformParams.w;
				half3 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;
				o.worldPos = worldPos;
				TRANSFER_SHADOW_CASTER_NORMALOFFSET( o )
				o.screenPos = ComputeScreenPos( o.pos );
				return o;
			}
			half4 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 = IN.worldPos;
				half3 worldViewDir = normalize( UnityWorldSpaceViewDir( worldPos ) );
				surfIN.worldPos = worldPos;
				surfIN.screenPos = IN.screenPos;
				SurfaceOutputStandardCustom o;
				UNITY_INITIALIZE_OUTPUT( SurfaceOutputStandardCustom, o )
				surf( surfIN, o );
				#if defined( CAN_SKIP_VPOS )
				float2 vpos = IN.pos;
				#endif
				half alphaRef = tex3D( _DitherMaskLOD, float3( vpos.xy * 0.25, o.Alpha * 0.9375 ) ).a;
				clip( alphaRef - 0.01 );
				SHADOW_CASTER_FRAGMENT( IN )
			}
			ENDCG
		}
	}
	Fallback "Diffuse"
	CustomEditor "ASEMaterialInspector"
}
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