// ***********************************************************************
// Author           : Kimch
// Created          : 2018-7-1
// Description      : 角色Shader
// Last Modified By : Kimch
// Last Modified On : 2019-7-1
// ***********************************************************************
// <copyright file= "MY_PBS_PlayerV2" company="kk"></copyright>
// ***********************************************************************
Shader "MY/PBS/PlayerV2"
{
	Properties
	{
		_Color("Color", Color) = (1,1,1,1)
		_MainTex("Albedo (RGB)", 2D) = "white" {}
		_BumpMap("Bumpmap", 2D) = "bump" {}
		_Detail("Detail", 2D) = "gray" {}
		_Control("R(metallic)G(Smooth)B(liuguang)", 2D) = "white" { }

		_Glossiness("Smoothness", Range(0,1)) = 0.5
		_Metallic("Metallic", Range(0,1)) = 0.0
	}
		SubShader
		{
			Tags { "RenderType" = "Opaque" }
			LOD 200
			CGINCLUDE
			ENDCG

				Pass
	{
		Name "Glow"

		ColorMask RGB
		Blend One One
		ZWrite Off
		ZTest Greater
		Fog {Mode Off}

		CGPROGRAM
		#pragma vertex vert
		#pragma fragment frag
		#include "UnityCG.cginc"

		fixed4 _FresnelColor;
		fixed _FresnelExp;

		struct VertexInput
		{
			half4 vertex : POSITION;
			half3 normal : NORMAL;
		};

		struct VertexOutput
		{
			half4 pos : SV_POSITION;
			half3 color : TEXCOORD0;
			//half4 posWorld : TEXCOORD0;
			//half3 normalDir : TEXCOORD1;
		};

		VertexOutput vert(VertexInput v)
		{
			VertexOutput o;
			o.pos = UnityObjectToClipPos(v.vertex);

			half3 normalDir = mul(v.normal, unity_WorldToObject);
			normalDir = normalize(normalDir);
			half3 viewDir = mul(unity_ObjectToWorld, v.vertex);
			viewDir = normalize(_WorldSpaceCameraPos - viewDir);
			o.color = _FresnelColor.rgb * pow(1.0 - max(0, dot(normalDir, viewDir)), _FresnelExp);

			//o.normalDir = normalize(mul(half4(v.normal,0), unity_WorldToObject).xyz);
			//o.posWorld = mul(unity_ObjectToWorld, v.vertex);
			//o.posWorld.xyz = normalize(_WorldSpaceCameraPos.xyz - o.posWorld.xyz);
			//o.posWorld.x = pow(1.0 - max(0, dot(o.normalDir, o.posWorld.xyz)), _FresnelExp);
			return o;
		}

		fixed4 frag(VertexOutput i) : COLOR
		{
			//half3 viewDirection = normalize(_WorldSpaceCameraPos.xyz - i.posWorld.xyz);
			//half3 normalDirection = normalize(i.normalDir);
			//fixed3 finalColor = _FresnelColor.rgb * pow(1.0 - max(0,dot(normalDirection, viewDirection)) , _FresnelExp);
			return fixed4(i.color,1);
		}
		ENDCG
	}

			CGPROGRAM
			// Physically based Standard lighting model, and enable shadows on all light types
			#pragma surface surf Standard fullforwardshadows nometa nolightmap nofog nolppv noinstancing exclude_path:deferred exclude_path:prepass

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

			sampler2D _MainTex;
			sampler2D _BumpMap;
			sampler2D _Detail;
			sampler2D _Control;

			struct Input
			{
				float2 uv_MainTex;
				float2 uv_BumpMap;
				float2 uv_Detail;
			};

			//struct SurfaceOutputStandard
			//{
			//	fixed3 Albedo;      // base (diffuse or specular) color
			//	float3 Normal;      // tangent space normal, if written
			//	half3 Emission;
			//	half Metallic;      // 0=non-metal, 1=metal
			//	// Smoothness is the user facing name, it should be perceptual smoothness but user should not have to deal with it.
			//	// Everywhere in the code you meet smoothness it is perceptual smoothness
			//	half Smoothness;    // 0=rough, 1=smooth
			//	half Occlusion;     // occlusion (default 1)
			//	fixed Alpha;        // alpha for transparencies
			//};

			half _Glossiness;
			half _Metallic;
			fixed4 _Color;

			void surf(Input IN, inout SurfaceOutputStandard o)
			{
				// Albedo comes from a texture tinted by color
				fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
				o.Albedo = c.rgb;
				//o.Albedo *= tex2D(_Detail, IN.uv_Detail).rgb * 2;

				o.Normal = UnpackNormal(tex2D(_BumpMap, IN.uv_BumpMap));

				fixed4 control = tex2D(_Control, IN.uv_MainTex);

				// Metallic and smoothness come from slider variables
				o.Metallic = _Metallic * control.r;
				o.Smoothness = _Glossiness * control.g;
				o.Alpha = c.a;
			}
			ENDCG

			
		}
			FallBack "Diffuse"
}