// Made with Amplify Shader Editor
// Available at the Unity Asset Store - http://u3d.as/y3X 
Shader "ASESampleShaders/DitheringFade"
{
	Properties
	{
		_Cutoff( "Mask Clip Value", Float ) = 0.74
		_Albedo("Albedo", 2D) = "white" {}
		[NoScaleOffset]_Normal("Normal", 2D) = "bump" {}
		[NoScaleOffset]_Specular("Specular", 2D) = "white" {}
		[NoScaleOffset]_Occlusion("Occlusion", 2D) = "white" {}
		_StartDitheringFade("Start Dithering Fade", Float) = 0
		_EndDitheringFade("End Dithering Fade", Float) = 1
		_Float0("Float 0", Float) = 1
		_Color0("Color 0", Color) = (0.0518868,0.1491979,1,0.1921569)
		[HideInInspector] _texcoord( "", 2D ) = "white" {}
		[HideInInspector] __dirty( "", Int ) = 1
	}

	SubShader
	{
		Tags{ "RenderType" = "Transparent"  "Queue" = "AlphaTest+0" }
		Cull Back
		ZTest LEqual
		CGINCLUDE
		#include "UnityShaderVariables.cginc"
		#include "UnityPBSLighting.cginc"
		#include "Lighting.cginc"
		#pragma target 3.0
		struct Input
		{
			float2 uv_texcoord;
			float eyeDepth;
			float4 screenPosition;
		};

		uniform sampler2D _Normal;
		uniform sampler2D _Albedo;
		uniform float4 _Albedo_ST;
		uniform half4 _Color0;
		uniform float _Float0;
		uniform sampler2D _Specular;
		uniform sampler2D _Occlusion;
		uniform float _StartDitheringFade;
		uniform float _EndDitheringFade;
		uniform float _Cutoff = 0.74;


		inline float Dither8x8Bayer( int x, int y )
		{
			const float dither[ 64 ] = {
				 1, 49, 13, 61,  4, 52, 16, 64,
				33, 17, 45, 29, 36, 20, 48, 32,
				 9, 57,  5, 53, 12, 60,  8, 56,
				41, 25, 37, 21, 44, 28, 40, 24,
				 3, 51, 15, 63,  2, 50, 14, 62,
				35, 19, 47, 31, 34, 18, 46, 30,
				11, 59,  7, 55, 10, 58,  6, 54,
				43, 27, 39, 23, 42, 26, 38, 22};
			int r = y * 8 + x;
			return dither[r] / 64; // same # of instructions as pre-dividing due to compiler magic
		}


		void vertexDataFunc( inout appdata_full v, out Input o )
		{
			UNITY_INITIALIZE_OUTPUT( Input, o );
			o.eyeDepth = -UnityObjectToViewPos( v.vertex.xyz ).z;
			float4 ase_screenPos = ComputeScreenPos( UnityObjectToClipPos( v.vertex ) );
			o.screenPosition = ase_screenPos;
		}

		void surf( Input i , inout SurfaceOutputStandardSpecular o )
		{
			float2 uv0_Albedo = i.uv_texcoord * _Albedo_ST.xy + _Albedo_ST.zw;
			o.Normal = UnpackNormal( tex2D( _Normal, uv0_Albedo ) );
			half4 temp_output_74_0 = ( tex2D( _Albedo, uv0_Albedo ) * _Color0 * _Color0.a * _Float0 );
			o.Albedo = temp_output_74_0.rgb;
			o.Specular = tex2D( _Specular, uv0_Albedo ).rgb;
			o.Occlusion = tex2D( _Occlusion, uv0_Albedo ).r;
			o.Alpha = temp_output_74_0.r;
			half temp_output_65_0 = ( _StartDitheringFade + _ProjectionParams.y );
			float4 ase_screenPos = i.screenPosition;
			half4 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;
			half2 clipScreen26 = ase_screenPosNorm.xy * _ScreenParams.xy;
			half dither26 = Dither8x8Bayer( fmod(clipScreen26.x, 8), fmod(clipScreen26.y, 8) );
			clip( ( ( ( i.eyeDepth + -temp_output_65_0 ) / ( _EndDitheringFade - temp_output_65_0 ) ) - dither26 ) - _Cutoff );
		}

		ENDCG
		CGPROGRAM
		#pragma surface surf StandardSpecular 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"
			sampler3D _DitherMaskLOD;
			struct v2f
			{
				V2F_SHADOW_CASTER;
				float3 customPack1 : TEXCOORD1;
				float4 customPack2 : TEXCOORD2;
				float3 worldPos : 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;
				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;
				o.customPack2.xyzw = customInputData.screenPosition;
				o.worldPos = worldPos;
				TRANSFER_SHADOW_CASTER_NORMALOFFSET( o )
				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;
				surfIN.screenPosition = IN.customPack2.xyzw;
				float3 worldPos = IN.worldPos;
				half3 worldViewDir = normalize( UnityWorldSpaceViewDir( worldPos ) );
				SurfaceOutputStandardSpecular o;
				UNITY_INITIALIZE_OUTPUT( SurfaceOutputStandardSpecular, 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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