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#ifndef LIGHTWEIGHT_PASS_LIT_INCLUDED
#define LIGHTWEIGHT_PASS_LIT_INCLUDED
#include "LWRP/ShaderLibrary/InputSurface.hlsl"
#include "LWRP/ShaderLibrary/Lighting.hlsl"
struct LightweightVertexInput
{
float4 vertex : POSITION;
float3 normal : NORMAL;
float4 tangent : TANGENT;
float2 texcoord : TEXCOORD0;
float2 lightmapUV : TEXCOORD1;
UNITY_VERTEX_INPUT_INSTANCE_ID
};
struct LightweightVertexOutput
{
float2 uv : TEXCOORD0;
float4 lightmapUVOrVertexSH : TEXCOORD1; // holds either lightmapUV or vertex SH. depending on LIGHTMAP_ON
float3 posWS : TEXCOORD2;
half3 normal : TEXCOORD3;
#ifdef _NORMALMAP
half3 tangent : TEXCOORD4;
half3 binormal : TEXCOORD5;
#endif
half3 viewDir : TEXCOORD6;
half4 fogFactorAndVertexLight : TEXCOORD7; // x: fogFactor, yzw: vertex light
#ifdef _SHADOWS_ENABLED
float4 shadowCoord : TEXCOORD8;
#endif
float4 clipPos : SV_POSITION;
UNITY_VERTEX_INPUT_INSTANCE_ID
};
void InitializeInputData(LightweightVertexOutput IN, half3 normalTS, out InputData inputData)
{
inputData.positionWS = IN.posWS.xyz;
#ifdef _NORMALMAP
inputData.normalWS = TangentToWorldNormal(normalTS, IN.tangent, IN.binormal, IN.normal);
#else
inputData.normalWS = normalize(IN.normal);
#endif
#ifdef SHADER_API_MOBILE
// viewDirection should be normalized here, but we avoid doing it as it's close enough and we save some ALU.
inputData.viewDirectionWS = IN.viewDir;
#else
inputData.viewDirectionWS = normalize(IN.viewDir);
#endif
#ifdef _SHADOWS_ENABLED
inputData.shadowCoord = IN.shadowCoord;
#else
inputData.shadowCoord = float4(0, 0, 0, 0);
#endif
inputData.fogCoord = IN.fogFactorAndVertexLight.x;
inputData.vertexLighting = IN.fogFactorAndVertexLight.yzw;
inputData.bakedGI = SampleGI(IN.lightmapUVOrVertexSH, inputData.normalWS);
}
///////////////////////////////////////////////////////////////////////////////
// Vertex and Fragment functions //
///////////////////////////////////////////////////////////////////////////////
// Vertex: Used for Standard and StandardSimpleLighting shaders
LightweightVertexOutput LitPassVertex(LightweightVertexInput v)
{
LightweightVertexOutput o = (LightweightVertexOutput)0;
UNITY_SETUP_INSTANCE_ID(v);
UNITY_TRANSFER_INSTANCE_ID(v, o);
o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
o.posWS = TransformObjectToWorld(v.vertex.xyz);
o.clipPos = TransformWorldToHClip(o.posWS);
o.viewDir = SafeNormalize(GetCameraPositionWS() - o.posWS);
// initializes o.normal and if _NORMALMAP also o.tangent and o.binormal
OUTPUT_NORMAL(v, o);
// We either sample GI from lightmap or SH. lightmap UV and vertex SH coefficients
// are packed in lightmapUVOrVertexSH to save interpolator.
// The following funcions initialize
OUTPUT_LIGHTMAP_UV(v.lightmapUV, unity_LightmapST, o.lightmapUVOrVertexSH);
OUTPUT_SH(o.normal, o.lightmapUVOrVertexSH);
half3 vertexLight = VertexLighting(o.posWS, o.normal);
half fogFactor = ComputeFogFactor(o.clipPos.z);
o.fogFactorAndVertexLight = half4(fogFactor, vertexLight);
#if defined(_SHADOWS_ENABLED) && !defined(_SHADOWS_CASCADE)
o.shadowCoord = ComputeShadowCoord(o.posWS.xyz);
#endif
return o;
}
// Used for Standard shader
half4 LitPassFragment(LightweightVertexOutput IN) : SV_Target
{
UNITY_SETUP_INSTANCE_ID(IN);
SurfaceData surfaceData;
InitializeStandardLitSurfaceData(IN.uv, surfaceData);
InputData inputData;
InitializeInputData(IN, surfaceData.normalTS, inputData);
half4 color = LightweightFragmentPBR(inputData, surfaceData.albedo, surfaceData.metallic, surfaceData.specular, surfaceData.smoothness, surfaceData.occlusion, surfaceData.emission, surfaceData.alpha);
ApplyFog(color.rgb, inputData.fogCoord);
return color;
}
// Used for StandardSimpleLighting shader
half4 LitPassFragmentSimple(LightweightVertexOutput IN) : SV_Target
{
UNITY_SETUP_INSTANCE_ID(IN);
float2 uv = IN.uv;
half4 diffuseAlpha = SAMPLE_TEXTURE2D(_MainTex, sampler_MainTex, uv);
half3 diffuse = diffuseAlpha.rgb * _Color.rgb;
#ifdef _GLOSSINESS_FROM_BASE_ALPHA
half alpha = _Color.a;
#else
half alpha = diffuseAlpha.a * _Color.a;
#endif
AlphaDiscard(alpha, _Cutoff);
#ifdef _NORMALMAP
half3 normalTS = Normal(uv);
#else
half3 normalTS = half3(0, 0, 1);
#endif
half3 emission = Emission(uv);
half4 specularGloss = SpecularGloss(uv, diffuseAlpha.a);
half shininess = _Shininess * 128.0h;
InputData inputData;
InitializeInputData(IN, normalTS, inputData);
return LightweightFragmentBlinnPhong(inputData, diffuse, specularGloss, shininess, emission, alpha);
};
#endif