Merge SSS with Standard

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/Subsurface/LightweightPassLit.hlsl

-#ifndef LIGHTWEIGHT_PASS_LIT_INCLUDED
-#define LIGHTWEIGHT_PASS_LIT_INCLUDED
-
-#include "LWRP/ShaderLibrary/InputSurface.hlsl"
-#include "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
-    float4 shadowCoord               : TEXCOORD8;
-
-    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
-
-    inputData.shadowCoord = IN.shadowCoord;
-    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);
-    o.shadowCoord = ComputeScreenPos(o.clipPos);
-
-    return o;
-}
-
-float _Curvature;
-
-// Used for Standard shader
-half4 LitPassFragment(LightweightVertexOutput IN) : SV_Target
-{
-    UNITY_SETUP_INSTANCE_ID(IN);
-
-    SurfaceData surfaceData;
-    InitializeStandardLitSurfaceData(IN.uv, surfaceData);
-    ApplySSAO(surfaceData.occlusion, IN.shadowCoord);
-
-    InputData inputData;
-    InitializeInputData(IN, surfaceData.normalTS, inputData);
-
-    float curvature = ( (length(fwidth(IN.normal))) / 
-                        (length(fwidth(inputData.positionWS))) * _Curvature );
-
-    Light light = GetMainLight(inputData.positionWS);
-
-    half4 color = LightweightFragmentPBR(inputData, surfaceData.albedo, surfaceData.metallic, surfaceData.specular, surfaceData.smoothness, surfaceData.occlusion, surfaceData.emission, surfaceData.alpha, curvature);
-
-    ApplyFog(color.rgb, inputData.fogCoord);
-
-    return half4(color.rgb, 1);
-}
-
-// Used for Standard shader
-half4 LitPassFragmentNull(LightweightVertexOutput IN) : SV_Target
-{
-    LitPassFragment(IN);
-    return 0;
-}
-
-// 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;
-
-    half alpha = diffuseAlpha.a * _Color.a;
-    AlphaDiscard(alpha, _Cutoff);
-#ifdef _ALPHAPREMULTIPLY_ON
-    diffuse *= alpha;
-#endif
-
-#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);
-};
-
-// Used for StandardSimpleLighting shader
-half4 LitPassFragmentSimpleNull(LightweightVertexOutput IN) : SV_Target
-{
-    half4 result = LitPassFragmentSimple(IN);
-    return result.a;
-}
-
-#endif
+#ifndef LIGHTWEIGHT_PASS_LIT_INCLUDED
+#define LIGHTWEIGHT_PASS_LIT_INCLUDED
+
+#include "LWRP/ShaderLibrary/InputSurface.hlsl"
+#include "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
+
+    float4 shadowCoord               : TEXCOORD8;
+
+    float4 clipPos                  : SV_POSITION;
+    UNITY_VERTEX_INPUT_INSTANCE_ID
+    UNITY_VERTEX_OUTPUT_STEREO
+};
+
+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
+
+#if SHADER_HINT_NICE_QUALITY
+    inputData.viewDirectionWS = SafeNormalize(IN.viewDir);
+#else
+    // View direction is already normalize in vertex. Small acceptable error to save ALU.
+    inputData.viewDirectionWS = IN.viewDir;
+#endif
+
+    inputData.shadowCoord = IN.shadowCoord;
+
+    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);
+    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
+
+    o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
+
+    o.posWS = TransformObjectToWorld(v.vertex.xyz);
+    o.clipPos = TransformWorldToHClip(o.posWS);
+
+    o.viewDir = GetCameraPositionWS() - o.posWS;
+
+#if !SHADER_HINT_NICE_QUALITY
+    // Normalize in vertex and avoid renormalizing it in frag to save ALU.
+    o.viewDir = SafeNormalize(o.viewDir);
+#endif
+
+    // 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);
+    o.shadowCoord = ComputeShadowCoord(o.clipPos);
+
+    return o;
+}
+
+float _Curvature;
+
+// Used for Standard shader
+half4 LitPassFragment(LightweightVertexOutput IN) : SV_Target
+{
+    UNITY_SETUP_INSTANCE_ID(IN);
+
+    SurfaceData surfaceData;
+    InitializeStandardLitSurfaceData(IN.uv, surfaceData);
+    ApplySSAO(surfaceData.occlusion, IN.shadowCoord);
+
+    InputData inputData;
+    InitializeInputData(IN, surfaceData.normalTS, inputData);
+
+    float curvature = ( (length(fwidth(IN.normal))) / 
+                        (length(fwidth(inputData.positionWS))) * _Curvature );
+
+    Light light = GetMainLight(inputData.positionWS);
+
+    half4 color = LightweightFragmentPBR(inputData, surfaceData.albedo, surfaceData.metallic, surfaceData.specular, surfaceData.smoothness, surfaceData.occlusion, surfaceData.emission, surfaceData.alpha, curvature);
+
+    ApplyFog(color.rgb, inputData.fogCoord);
+    return color;
+}
+
+// Used for Standard shader
+half4 LitPassFragmentNull(LightweightVertexOutput IN) : SV_Target
+{
+    LitPassFragment(IN);
+    return 0;
+}
+
+// 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;
+
+    half alpha = diffuseAlpha.a * _Color.a;
+    AlphaDiscard(alpha, _Cutoff);
+#ifdef _ALPHAPREMULTIPLY_ON
+    diffuse *= alpha;
+#endif
+
+#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);
+};
+
+// Used for StandardSimpleLighting shader
+half4 LitPassFragmentSimpleNull(LightweightVertexOutput IN) : SV_Target
+{
+    half4 result = LitPassFragmentSimple(IN);
+    return result.a;
+}
+
+#endif