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146 行
4.5 KiB
146 行
4.5 KiB
#ifndef LIGHTWEIGHT_PASS_LIT_INCLUDED
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#define LIGHTWEIGHT_PASS_LIT_INCLUDED
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#include "LWRP/ShaderLibrary/InputSurface.hlsl"
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#include "LWRP/ShaderLibrary/Lighting.hlsl"
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struct LightweightVertexInput
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{
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float4 vertex : POSITION;
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float3 normal : NORMAL;
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float4 tangent : TANGENT;
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float2 texcoord : TEXCOORD0;
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float2 lightmapUV : TEXCOORD1;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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};
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struct LightweightVertexOutput
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{
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float2 uv : TEXCOORD0;
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DECLARE_LIGHTMAP_OR_SH(lightmapUV, vertexSH, 1);
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#ifdef _ADDITIONAL_LIGHTS
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float3 posWS : TEXCOORD2;
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#endif
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#ifdef _NORMALMAP
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half4 normal : TEXCOORD3; // xyz: normal, w: viewDir.x
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half4 tangent : TEXCOORD4; // xyz: tangent, w: viewDir.y
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half4 binormal : TEXCOORD5; // xyz: binormal, w: viewDir.z
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#else
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half3 normal : TEXCOORD3;
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half3 viewDir : TEXCOORD4;
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#endif
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half4 fogFactorAndVertexLight : TEXCOORD6; // x: fogFactor, yzw: vertex light
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#ifdef _SHADOWS_ENABLED
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float4 shadowCoord : TEXCOORD7;
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#endif
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float4 clipPos : SV_POSITION;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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UNITY_VERTEX_OUTPUT_STEREO
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};
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void InitializeInputData(LightweightVertexOutput IN, half3 normalTS, out InputData inputData)
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{
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inputData = (InputData)0;
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#ifdef _ADDITIONAL_LIGHTS
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inputData.positionWS = IN.posWS;
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#endif
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#ifdef _NORMALMAP
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half3 viewDir = half3(IN.normal.w, IN.tangent.w, IN.binormal.w);
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inputData.normalWS = TangentToWorldNormal(normalTS, IN.tangent.xyz, IN.binormal.xyz, IN.normal.xyz);
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#else
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half3 viewDir = IN.viewDir;
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inputData.normalWS = FragmentNormalWS(IN.normal);
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#endif
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inputData.viewDirectionWS = FragmentViewDirWS(viewDir);
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#ifdef _SHADOWS_ENABLED
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inputData.shadowCoord = IN.shadowCoord;
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#else
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inputData.shadowCoord = float4(0, 0, 0, 0);
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#endif
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inputData.fogCoord = IN.fogFactorAndVertexLight.x;
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inputData.vertexLighting = IN.fogFactorAndVertexLight.yzw;
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inputData.bakedGI = SAMPLE_GI(IN.lightmapUV, IN.vertexSH, inputData.normalWS);
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}
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///////////////////////////////////////////////////////////////////////////////
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// Vertex and Fragment functions //
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///////////////////////////////////////////////////////////////////////////////
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// Used in Standard (Physically Based) shader
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LightweightVertexOutput LitPassVertex(LightweightVertexInput v)
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{
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LightweightVertexOutput o = (LightweightVertexOutput)0;
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UNITY_SETUP_INSTANCE_ID(v);
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UNITY_TRANSFER_INSTANCE_ID(v, o);
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UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
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o.uv = TransformMainTextureCoord(v.texcoord);
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float3 posWS = TransformObjectToWorld(v.vertex.xyz);
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o.clipPos = TransformWorldToHClip(posWS);
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half3 viewDir = VertexViewDirWS(GetCameraPositionWS() - posWS);
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#ifdef _NORMALMAP
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o.normal.w = viewDir.x;
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o.tangent.w = viewDir.y;
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o.binormal.w = viewDir.z;
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#else
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o.viewDir = viewDir;
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#endif
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// initializes o.normal and if _NORMALMAP also o.tangent and o.binormal
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OUTPUT_NORMAL(v, o);
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// We either sample GI from lightmap or SH.
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// Lightmap UV and vertex SH coefficients use the same interpolator ("float2 lightmapUV" for lightmap or "half3 vertexSH" for SH)
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// see DECLARE_LIGHTMAP_OR_SH macro.
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// The following funcions initialize the correct variable with correct data
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OUTPUT_LIGHTMAP_UV(v.lightmapUV, unity_LightmapST, o.lightmapUV);
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OUTPUT_SH(o.normal.xyz, o.vertexSH);
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half3 vertexLight = VertexLighting(posWS, o.normal.xyz);
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half fogFactor = ComputeFogFactor(o.clipPos.z);
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o.fogFactorAndVertexLight = half4(fogFactor, vertexLight);
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#ifdef _SHADOWS_ENABLED
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#if SHADOWS_SCREEN
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o.shadowCoord = ComputeShadowCoord(o.clipPos);
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#else
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o.shadowCoord = TransformWorldToShadowCoord(posWS);
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#endif
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#endif
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#if _ADDITIONAL_LIGHTS
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o.posWS = posWS;
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#endif
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return o;
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}
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// Used in Standard (Physically Based) shader
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half4 LitPassFragment(LightweightVertexOutput IN) : SV_Target
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{
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UNITY_SETUP_INSTANCE_ID(IN);
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SurfaceData surfaceData;
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InitializeStandardLitSurfaceData(IN.uv, surfaceData);
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InputData inputData;
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InitializeInputData(IN, surfaceData.normalTS, inputData);
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half4 color = LightweightFragmentPBR(inputData, surfaceData.albedo, surfaceData.metallic, surfaceData.specular, surfaceData.smoothness, surfaceData.occlusion, surfaceData.emission, surfaceData.alpha);
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ApplyFog(color.rgb, inputData.fogCoord);
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return color;
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}
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#endif
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