// Made with Amplify Shader Editor v1.9.2.2
// Available at the Unity Asset Store - http://u3d.as/y3X 
Shader "Glass"
{
	Properties
	{
		_Color1("Color 1", Color) = (0.3411765,0.4117647,0.4627451,1)
		_Color2("Color 2", Color) = (0.1882353,0.2196079,0.2431373,1)
		_Smoothness("Smoothness", Range( 0 , 1)) = 1
		_Metallic("Metallic", Range( 0 , 1)) = 0
		_DepthFade("Depth Fade", Float) = 0.1
		_ReflectionScale("Reflection Scale", Float) = 8
		_ReflectionStr("Reflection Str", Float) = 0.1
		_FresnelScale("Fresnel Scale", Float) = 4
		_FresnelPower("Fresnel Power", Float) = 2
		[HideInInspector] _texcoord( "", 2D ) = "white" {}
		[HideInInspector] __dirty( "", Int ) = 1
	}

	SubShader
	{
		Tags{ "RenderType" = "Transparent"  "Queue" = "Transparent+0" "IgnoreProjector" = "True" }
		Cull Back
		CGINCLUDE
		#include "UnityCG.cginc"
		#include "UnityShaderVariables.cginc"
		#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) half3(dot(data.internalSurfaceTtoW0,normal), dot(data.internalSurfaceTtoW1,normal), dot(data.internalSurfaceTtoW2,normal))
		#endif
		struct Input
		{
			float3 worldPos;
			float3 worldNormal;
			INTERNAL_DATA
			float2 uv_texcoord;
			float4 screenPos;
			float eyeDepth;
		};

		uniform float _ReflectionScale;
		uniform float _ReflectionStr;
		uniform float4 _Color1;
		uniform float4 _Color2;
		UNITY_DECLARE_DEPTH_TEXTURE( _CameraDepthTexture );
		uniform float4 _CameraDepthTexture_TexelSize;
		uniform float _DepthFade;
		uniform float _FresnelScale;
		uniform float _FresnelPower;
		uniform float _Metallic;
		uniform float _Smoothness;


		//https://www.shadertoy.com/view/XdXGW8
		float2 GradientNoiseDir( float2 x )
		{
			const float2 k = float2( 0.3183099, 0.3678794 );
			x = x * k + k.yx;
			return -1.0 + 2.0 * frac( 16.0 * k * frac( x.x * x.y * ( x.x + x.y ) ) );
		}
		
		float GradientNoise( float2 UV, float Scale )
		{
			float2 p = UV * Scale;
			float2 i = floor( p );
			float2 f = frac( p );
			float2 u = f * f * ( 3.0 - 2.0 * f );
			return lerp( lerp( dot( GradientNoiseDir( i + float2( 0.0, 0.0 ) ), f - float2( 0.0, 0.0 ) ),
					dot( GradientNoiseDir( i + float2( 1.0, 0.0 ) ), f - float2( 1.0, 0.0 ) ), u.x ),
					lerp( dot( GradientNoiseDir( i + float2( 0.0, 1.0 ) ), f - float2( 0.0, 1.0 ) ),
					dot( GradientNoiseDir( i + float2( 1.0, 1.0 ) ), f - float2( 1.0, 1.0 ) ), u.x ), u.y );
		}


		float3 PerturbNormal107_g2( float3 surf_pos, float3 surf_norm, float height, float scale )
		{
			// "Bump Mapping Unparametrized Surfaces on the GPU" by Morten S. Mikkelsen
			float3 vSigmaS = ddx( surf_pos );
			float3 vSigmaT = ddy( surf_pos );
			float3 vN = surf_norm;
			float3 vR1 = cross( vSigmaT , vN );
			float3 vR2 = cross( vN , vSigmaS );
			float fDet = dot( vSigmaS , vR1 );
			float dBs = ddx( height );
			float dBt = ddy( height );
			float3 vSurfGrad = scale * 0.05 * sign( fDet ) * ( dBs * vR1 + dBt * vR2 );
			return normalize ( abs( fDet ) * vN - vSurfGrad );
		}


		void vertexDataFunc( inout appdata_full v, out Input o )
		{
			UNITY_INITIALIZE_OUTPUT( Input, o );
			o.eyeDepth = -UnityObjectToViewPos( v.vertex.xyz ).z;
		}

		void surf( Input i , inout SurfaceOutputStandard o )
		{
			float3 ase_worldPos = i.worldPos;
			float3 surf_pos107_g2 = ase_worldPos;
			float3 ase_worldNormal = WorldNormalVector( i, float3( 0, 0, 1 ) );
			float3 surf_norm107_g2 = ase_worldNormal;
			float gradientNoise20 = GradientNoise(i.uv_texcoord,_ReflectionScale);
			gradientNoise20 = gradientNoise20*0.5 + 0.5;
			float height107_g2 = gradientNoise20;
			float scale107_g2 = _ReflectionStr;
			float3 localPerturbNormal107_g2 = PerturbNormal107_g2( surf_pos107_g2 , surf_norm107_g2 , height107_g2 , scale107_g2 );
			float3 ase_worldTangent = WorldNormalVector( i, float3( 1, 0, 0 ) );
			float3 ase_worldBitangent = WorldNormalVector( i, float3( 0, 1, 0 ) );
			float3x3 ase_worldToTangent = float3x3( ase_worldTangent, ase_worldBitangent, ase_worldNormal );
			float3 worldToTangentDir42_g2 = mul( ase_worldToTangent, localPerturbNormal107_g2);
			float3 temp_output_18_40 = worldToTangentDir42_g2;
			o.Normal = temp_output_18_40;
			float4 ase_screenPos = float4( i.screenPos.xyz , i.screenPos.w + 0.00000000001 );
			float4 ase_screenPosNorm = ase_screenPos / ase_screenPos.w;
			ase_screenPosNorm.z = ( UNITY_NEAR_CLIP_VALUE >= 0 ) ? ase_screenPosNorm.z : ase_screenPosNorm.z * 0.5 + 0.5;
			float screenDepth4 = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE( _CameraDepthTexture, ase_screenPosNorm.xy ));
			float distanceDepth4 = saturate( abs( ( screenDepth4 - LinearEyeDepth( ase_screenPosNorm.z ) ) / ( _DepthFade ) ) );
			float4 lerpResult7 = lerp( _Color1 , _Color2 , distanceDepth4);
			float3 ase_worldViewDir = normalize( UnityWorldSpaceViewDir( ase_worldPos ) );
			float3x3 ase_tangentToWorldFast = float3x3(ase_worldTangent.x,ase_worldBitangent.x,ase_worldNormal.x,ase_worldTangent.y,ase_worldBitangent.y,ase_worldNormal.y,ase_worldTangent.z,ase_worldBitangent.z,ase_worldNormal.z);
			float fresnelNdotV23 = dot( mul(ase_tangentToWorldFast,temp_output_18_40), ase_worldViewDir );
			float fresnelNode23 = ( 0.0 + _FresnelScale * pow( 1.0 - fresnelNdotV23, _FresnelPower ) );
			float2 _Vector0 = float2(0,0);
			float cameraDepthFade21 = (( i.eyeDepth -_ProjectionParams.y - _Vector0.y ) / _Vector0.x);
			float clampResult35 = clamp( cameraDepthFade21 , 0.0 , 2.0 );
			float4 lerpResult36 = lerp( lerpResult7 , _Color1 , ( fresnelNode23 * clampResult35 ));
			o.Albedo = lerpResult36.rgb;
			o.Metallic = _Metallic;
			o.Smoothness = _Smoothness;
			o.Alpha = 1;
		}

		ENDCG
		CGPROGRAM
		#pragma surface surf Standard alpha:fade keepalpha fullforwardshadows vertex:vertexDataFunc 

		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"
			struct v2f
			{
				V2F_SHADOW_CASTER;
				float3 customPack1 : TEXCOORD1;
				float4 screenPos : TEXCOORD2;
				float4 tSpace0 : TEXCOORD3;
				float4 tSpace1 : TEXCOORD4;
				float4 tSpace2 : TEXCOORD5;
				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;
				vertexDataFunc( v, 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.customPack1.z = customInputData.eyeDepth;
				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;
				surfIN.eyeDepth = IN.customPack1.z;
				float3 worldPos = float3( IN.tSpace0.w, IN.tSpace1.w, IN.tSpace2.w );
				half3 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;
				surfIN.screenPos = IN.screenPos;
				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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