MultiE.shader

Shader "LightweightPipeline/MultiE"
{
	Properties
	{
		// Specular vs Metallic workflow
		[HideInInspector] _WorkflowMode("WorkflowMode", Float) = 1.0

		_Color("Color", Color) = (0.5,0.5,0.5,1)
		_MainTex("Albedo", 2D) = "white" {}

	_Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

		_Glossiness("Smoothness", Range(0.0, 1.0)) = 0.5
		_GlossMapScale("Smoothness Scale", Range(0.0, 1.0)) = 1.0
		_SmoothnessTextureChannel("Smoothness texture channel", Float) = 0

		[Gamma] _Metallic("Metallic", Range(0.0, 1.0)) = 0.0
		_MetallicGlossMap("Metallic", 2D) = "white" {}

	_SpecColor("Specular", Color) = (0.2, 0.2, 0.2)
		_SpecGlossMap("Specular", 2D) = "white" {}

	[ToggleOff] _SpecularHighlights("Specular Highlights", Float) = 1.0
		[ToggleOff] _GlossyReflections("Glossy Reflections", Float) = 1.0

		_BumpScale("Scale", Float) = 1.0
		_BumpMap("Normal Map", 2D) = "bump" {}

	_OcclusionStrength("Strength", Range(0.0, 1.0)) = 1.0
		_OcclusionMap("Occlusion", 2D) = "white" {}

	_EmissionColor("Color", Color) = (0,0,0)
		_EmissionMap("Emission", 2D) = "white" {}

	_SecondEmissionColor("Color", Color) = (0,0,0)
        _SecondEmissionMap("Second Emission", 2D) = "white" {}

	// Blending state
	[HideInInspector] _Surface("__surface", Float) = 0.0
		[HideInInspector] _Blend("__blend", Float) = 0.0
		[HideInInspector] _AlphaClip("__clip", Float) = 0.0
		[HideInInspector] _SrcBlend("__src", Float) = 1.0
		[HideInInspector] _DstBlend("__dst", Float) = 0.0
		[HideInInspector] _ZWrite("__zw", Float) = 1.0
		[HideInInspector] _Cull("__cull", Float) = 2.0
	}

		SubShader
	{
		// Lightweight Pipeline tag is required. If Lightweight pipeline is not set in the graphics settings
		// this Subshader will fail. One can add a subshader below or fallback to Standard built-in to make this
		// material work with both Lightweight Pipeline and Builtin Unity Pipeline
		Tags{ "RenderType" = "Opaque" "RenderPipeline" = "LightweightPipeline" "IgnoreProjector" = "True" }
		LOD 300

		// ------------------------------------------------------------------
		//  Forward pass. Shades all light in a single pass. GI + emission + Fog
		Pass
	{
		// Lightmode matches the ShaderPassName set in LightweightPipeline.cs. SRPDefaultUnlit and passes with
		// no LightMode tag are also rendered by Lightweight Pipeline
		Name "StandardLit"
		Tags{ "LightMode" = "LightweightForward" }

		Blend[_SrcBlend][_DstBlend]
		ZWrite[_ZWrite]
		Cull[_Cull]

		HLSLPROGRAM
		// Required to compile gles 2.0 with standard SRP library
		// All shaders must be compiled with HLSLcc and currently only gles is not using HLSLcc by default
#pragma prefer_hlslcc gles
#pragma exclude_renderers d3d11_9x
#pragma target 2.0

		// -------------------------------------
		// Material Keywords
#pragma shader_feature _NORMALMAP
#pragma shader_feature _ALPHATEST_ON
#pragma shader_feature _ALPHAPREMULTIPLY_ON
#pragma shader_feature _EMISSION
#pragma shader_feature _METALLICSPECGLOSSMAP
#pragma shader_feature _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
#pragma shader_feature _OCCLUSIONMAP

#pragma shader_feature _SPECULARHIGHLIGHTS_OFF
#pragma shader_feature _GLOSSYREFLECTIONS_OFF
#pragma shader_feature _SPECULAR_SETUP

		// -------------------------------------
		// Lightweight Pipeline keywords
#pragma multi_compile _ _ADDITIONAL_LIGHTS
#pragma multi_compile _ _VERTEX_LIGHTS
#pragma multi_compile _ _MIXED_LIGHTING_SUBTRACTIVE
#pragma multi_compile _ _SHADOWS_ENABLED
#pragma multi_compile _ _LOCAL_SHADOWS_ENABLED
#pragma multi_compile _ _SHADOWS_SOFT
#pragma multi_compile _ _SHADOWS_CASCADE

		// -------------------------------------
		// Unity defined keywords
#pragma multi_compile _ DIRLIGHTMAP_COMBINED
#pragma multi_compile _ LIGHTMAP_ON
#pragma multi_compile_fog

		//--------------------------------------
		// GPU Instancing
#pragma multi_compile_instancing

#pragma vertex LitPassVertex
#pragma fragment LitPassFragment

		// Including the following two function is enought for shading with Lightweight Pipeline. Everything is included in them.
		// Core.hlsl will include SRP shader library, all constant buffers not related to materials (perobject, percamera, perframe).
		// It also includes matrix/space conversion functions and fog.
		// Lighting.hlsl will include the light functions/data to abstract light constants. You should use GetMainLight and GetLight functions
		// that initialize Light struct. Lighting.hlsl also include GI, Light BDRF functions. It also includes Shadows.
#include "LWRP/ShaderLibrary/Core.hlsl"
#include "LWRP/ShaderLibrary/Lighting.hlsl"

		// Not required but included here for simplicity. This defines all material related constants for the Standard surface shader like _Color, _MainTex, and so on.
		// These are specific to this shader. You should define your own constants.
#include "LWRP/ShaderLibrary/InputSurfacePBR.hlsl"

		struct VertexInput
	{
		float4 vertex       : POSITION;
		float3 normal       : NORMAL;
		float4 tangent      : TANGENT;
		float2 texcoord     : TEXCOORD0;
		float2 lightmapUV   : TEXCOORD1;
	};

	struct VertexOutput
	{
		float2 uv                       : TEXCOORD0;
		float2 lightmapUV               : TEXCOORD1;
		float4 positionWSAndFogFactor   : TEXCOORD2;
		half3  normal                   : TEXCOORD3;

#if _NORMALMAP
		half3 tangent                   : TEXCOORD4;
		half3 binormal                  : TEXCOORD5;
#endif

#ifdef _SHADOWS_ENABLED
		float4 shadowCoord              : TEXCOORD6;
#endif
		float4 clipPos                  : SV_POSITION;
	};

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

		// Pretty much same as builtin Unity shader library.
		o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
		o.lightmapUV = v.lightmapUV.xy * unity_LightmapST.xy + unity_LightmapST.zw;

		// SRP shader library adds some functions to convert between spaces.
		// TransformObjectToHClip and some other functions are defined.

		float3 positionWS = TransformObjectToWorld(v.vertex.xyz);
		o.clipPos = TransformWorldToHClip(positionWS);

		float fogFactor = ComputeFogFactor(o.clipPos.z);
		o.positionWSAndFogFactor = float4(positionWS, fogFactor);

#ifdef _NORMALMAP
		OutputTangentToWorld(v.tangent, v.normal, o.tangent, o.binormal, o.normal);
#else
		o.normal = TransformObjectToWorldNormal(v.normal);
#endif

#ifdef _SHADOWS_ENABLED
#if SHADOWS_SCREEN
		o.shadowCoord = ComputeShadowCoord(o.clipPos);
#else
		o.shadowCoord = TransformWorldToShadowCoord(positionWS);
#endif
#endif
		return o;
	}

	half4 LitPassFragment(VertexOutput IN) : SV_Target
	{
		// Surface data contains albedo, metallic, specular, smoothness, occlusion, emission and alpha
		// InitializeStandarLitSurfaceData initializes based on the rules for standard shader.
		// You can write your own function to initialize the surface data of your shader.
		SurfaceData surfaceData;
	InitializeStandardLitSurfaceData(IN.uv, surfaceData);

#if _NORMALMAP
	half3 normalWS = TangentToWorldNormal(surfaceData.normalTS, IN.tangent, IN.binormal, IN.normal);
#else
	half3 normalWS = normalize(IN.normal);
#endif

#ifdef LIGHTMAP_ON
	half3 bakedGI = SampleLightmap(IN.lightmapUV, normalWS);
#else
	half3 bakedGI = SampleSH(normalWS);
#endif

	float3 positionWS = IN.positionWSAndFogFactor.xyz;
	half3 viewDirectionWS = SafeNormalize(GetCameraPositionWS() - positionWS);

	// BRDFData holds energy conserving diffuse and specular material reflections and its roughness.
	// It's easy to plugin your own shading fuction. You just need replace LightingPhysicallyBased function
	// below with your own.
	BRDFData brdfData;
	InitializeBRDFData(surfaceData.albedo, surfaceData.metallic, surfaceData.specular, surfaceData.smoothness, surfaceData.alpha, brdfData);

	// Main light is the brighest directional light
	// Main light uses a separate set of constant buffers for light to avoid indexing and have tight memory access.
	Light mainLight = GetMainLight();
#ifdef _SHADOWS_ENABLED
	mainLight.attenuation = MainLightRealtimeShadowAttenuation(IN.shadowCoord);
#endif

	half3 color = GlobalIllumination(brdfData, bakedGI, surfaceData.occlusion, normalWS, viewDirectionWS);
	color += LightingPhysicallyBased(brdfData, mainLight, normalWS, viewDirectionWS);

#ifdef _ADDITIONAL_LIGHTS
	int pixelLightCount = GetPixelLightCount();
	for (int i = 0; i < pixelLightCount; ++i)
	{
		Light light = GetLight(i, positionWS);
		light.attenuation *= LocalLightRealtimeShadowAttenuation(light.index, positionWS);
		color += LightingPhysicallyBased(brdfData, light, normalWS, viewDirectionWS);
	}
#endif

	color += surfaceData.emission;

	float fogFactor = IN.positionWSAndFogFactor.w;
	ApplyFog(color, fogFactor);
	return half4(color, surfaceData.alpha);
	}
		ENDHLSL
	}

		// Used for shadows
		UsePass "LightweightPipeline/Standard (Physically Based)/ShadowCaster"

		// Used for depth prepass
		// If shadows cascade are enabled we need to perform a depth prepass.
		// We also need to use a depth prepass in some cases camera require depth texture
		// (e.g, MSAA is enabled and we can't resolve with Texture2DMS
		UsePass "LightweightPipeline/Standard (Physically Based)/DepthOnly"

		// Used for Baking GI. This pass is stripped from build.
		UsePass "LightweightPipeline/Standard (Physically Based)/Meta"
	}

		FallBack "Hidden/InternalErrorShader"
		CustomEditor "LightweightStandardGUI"
}