#ifndef SGAME_WATER_BASE
#define SGAME_WATER_BASE
	
	#include "./ExpHeightFog_Base.hlsl"
	#include "./Lighting_Base.hlsl"

	TEXTURE2D(_ReflectionTex); SAMPLER(sampler_ReflectionTex);
	TEXTURE2D(_NormalTexture); SAMPLER(sampler_NormalTexture);
	TEXTURECUBE(_ReflectionCubeMap); SAMPLER(sampler_ReflectionCubeMap);
	TEXTURE2D(_CameraDepthTexture); SAMPLER(sampler_CameraDepthTexture);

	CBUFFER_START(UnityPerMaterial)
		half4 _DeepWaterColor; half4 _ShallowWaterColor; half _ShallowDeepBlend; half _ShallowDeepFade;
		float4 _ReflectionTex_ST; half _ReflectionIntensity; half _DepthTransparency; half _Specular; half _Gloss;
		half _LightWrapping; float4 _NormalTexture_ST; half _Refraction; float4 _MainWaveTilingOffset; float4 _SecondWaveTilingOffset;
		half _SpecularRefraction; half _SpecularOffset; half _ReflectionDistortion;
		half4 _SpecularColor; half _FogFactor; half _MaxTransparency;
		half _ReflectionCubeMapOffset; half _CubeMapReflectionIntensity;
	CBUFFER_END

	struct VertexInput 
	{
		float4 vertex : POSITION;
		half3 normal : NORMAL;
		half4 tangent : TANGENT;
		float2 texcoord0 : TEXCOORD0;
	};
	struct VertexOutput 
	{
		float4 pos : SV_POSITION;
		float4 uv0 : TEXCOORD0;
		float2 uv1 : TEXCOORD1;
		float4 posWorld : TEXCOORD2;
		float4 screenPos : TEXCOORD3;
		float4 projPos : TEXCOORD4;
		#if defined(_SG_EXPFOG)
			half4 _fogCoord : TEXCOORD5;
		#endif
		#if defined(_PROJECTOR_ON)
			half4 projectorUV : TEXCOORD6;
		#endif
	};
	inline float3 UnityObjectToViewPos( in float3 pos )
	{
	    return mul(UNITY_MATRIX_V, mul(unity_ObjectToWorld, float4(pos, 1.0))).xyz;
	}
	#define COMPUTE_EYEDEPTH(o, vert) o = -UnityObjectToViewPos( vert ).z

	VertexOutput vert (VertexInput v) 
	{
		VertexOutput o = (VertexOutput)0;

		VertexPositionInputs vertexInput = GetVertexPositionInputs(v.vertex.xyz);
		VertexNormalInputs normalInput = GetVertexNormalInputs(v.normal, v.tangent);

  		float4 worldPos = half4(vertexInput.positionWS, 1);
		o.posWorld = worldPos;
		o.pos = vertexInput.positionCS;
		o.projPos = ComputeScreenPos (o.pos);
		COMPUTE_EYEDEPTH(o.projPos.z, v.vertex.xyz);
		o.screenPos = o.pos;

		o.uv0.xy = v.texcoord0 * _MainWaveTilingOffset.xy + _MainWaveTilingOffset.zw * _Time.r * 0.1;
		o.uv1.xy = v.texcoord0 * _SecondWaveTilingOffset.xy + _SecondWaveTilingOffset.zw * _Time.r * 0.1;

		#if defined(_SG_EXPFOG)
			CUSTOM_TRANSFER_FOG(o, v.vertex);
		#endif
		#if defined(_PROJECTOR_ON)
			o.projectorUV = GetProjectorUV(v.vertex, unity_ObjectToWorld);
		#endif
		return o;
	}

	half4 frag(VertexOutput i) : SV_TARGET 
	{
		float3 worldNormal = half3(0, 1, 0);
		half3x3 tangentTransform = half3x3(half3(1, 0, 0), half3(0, 0, 1), worldNormal);

		/////// Vectors:
		half3 viewDirection = GetCameraPositionWS() - i.posWorld.xyz;
		half4 _texture1 = SAMPLE_TEXTURE2D(_NormalTexture, sampler_NormalTexture, i.uv0.xy);
		half4 _texture2 = SAMPLE_TEXTURE2D(_NormalTexture, sampler_NormalTexture, i.uv1.xy);
		half3 _subtractor1 = (_texture1.rgb-_texture2.rgb);
		half3 normalLocal = lerp(half3(0,0,1),_subtractor1,_Refraction);
		half3 specularNormalLocal = lerp(half3(0,_SpecularOffset,1), _subtractor1, _SpecularRefraction);

		half3 normalDirection = normalize(mul( normalLocal, tangentTransform )); // Perturbed normals
		half3 specularNormalDirection = normalize(mul( specularNormalLocal, tangentTransform )); // Perturbed normals
		
		Light mainLight = GetMainLight();
		half3 lightDirection = normalize(mainLight.direction);
		half3 lightColor = mainLight.color.rgb;

		float sceneZ = 0;
		float partZ = max(0,i.projPos.z - _ProjectionParams.g);
		float diffZ = 0;
		
		float sampleDepth = SAMPLE_TEXTURE2D(_CameraDepthTexture, sampler_CameraDepthTexture, i.projPos.xy / i.projPos.z).r;
		sampleDepth = 1.0 / (_ZBufferParams.z * sampleDepth + _ZBufferParams.w);
		sceneZ = max(0, sampleDepth - _ProjectionParams.g);
		diffZ = sceneZ - partZ;

		half finalAlpha = clamp((diffZ / _DepthTransparency), 0, _MaxTransparency);

		half NDotL = dot( normalDirection, lightDirection );
		half NL = saturate(NDotL);
		half3 attenColor = lightColor;
		half3 ambientColor = UNITY_LIGHTMODEL_AMBIENT.rgb;
	
		///////// Gloss:
		half gloss = _Gloss;
	    half specPow =  gloss * 128;

		////// Specular:
		#if defined(SGAME_QUALITY_PERFECT) || defined(SGAME_QUALITY_HIGH)
			half3 specularColor = (_Specular*_SpecularColor.rgb);
			half3 specularHalfDirection = normalize(lightDirection + viewDirection);
			half NH = max(0,dot(specularHalfDirection,specularNormalDirection));
			float specAtten = SGamePow(NH, specPow);
			half3 directSpecular = specAtten*specularColor*attenColor*NL;
			half3 specular = directSpecular;
		#else
			half3 specular = half3(0,0,0);
		#endif

		/////// Diffuse:
		half3 directDiffuse = NL * attenColor * _LightWrapping;
		half3 indirectDiffuse = ambientColor;
		half3 totalDiffuse = (directDiffuse + indirectDiffuse);
	
		half shallowRatio =  1 - saturate((sceneZ - partZ)/_ShallowDeepBlend); //1��ʾDZˮ,0��ʶ��ˮ
		shallowRatio = SGamePow(shallowRatio, _ShallowDeepFade);
		half3 waterColor = lerp(_DeepWaterColor.rgb, _ShallowWaterColor.rgb, shallowRatio);
		half3 diffuseWater = totalDiffuse * waterColor;
	
		half3 planarReflect = 0;
		i.screenPos = float4( i.screenPos.xy / i.screenPos.w, 0, 0 );
		i.screenPos.y *= _ProjectionParams.x;
		half2 _componentMask = _subtractor1.rg;
		half2 remap = ((i.screenPos.rg+()*0.5+0.5);
		planarReflect = SAMPLE_TEXTURE2D(_ReflectionTex, sampler_ReflectionTex, TRANSFORM_TEX(remap, _ReflectionTex));

		half3 cubeMapRefl = 0;
		#if defined(_CUBEMAPTOGGLE_ON)
        	half3 R = reflect(-viewDirection, normalDirection);
			half3 cubeSampleUV = RotationY(R, _ReflectionCubeMapOffset);
			half4 refectionMap_Var = SAMPLE_TEXTURECUBE_LOD(_ReflectionCubeMap, sampler_ReflectionCubeMap, cubeSampleUV, 1); //这里计算的是CubeMap
			refectionMap_Var *= _CubeMapReflectionIntensity;
			cubeMapRefl = refectionMap_Var.rgb;
		#endif

		half3 ReflectionRGB = planarReflect + cubeMapRefl;
		half3 diffuse = lerp(diffuseWater, ReflectionRGB, _ReflectionIntensity);

		/// Final Color:
		half3 finalColor = diffuse + specular;
		finalColor.rgb = ApplyDark(finalColor.rgb);
	#if defined(_PROJECTOR_ON)
		finalColor.rgb = GetProjectorColor(finalColor.rgb, i.projectorUV).rgb;
	#endif
	#if defined(_SG_EXPFOG)
		CUSTOM_APPLY_FOG(i, finalColor.rgb, distance(_WorldSpaceCameraPos, i.posWorld.xyz));
	#endif
		finalAlpha *= clamp(length(_WorldSpaceCameraPos.xyz - i.posWorld.xyz) / 3, 0, 1);
		half4 finalRGBA = half4(finalColor, finalAlpha);

		return finalRGBA;
	}
#endif