【Unity】URP源码分析(Shader篇)
（基于Unity 2021.3.8、URP 12.1.7）着色器 (Shader)
光照模式 (LightMode)
[*]UniversalForward (前向 Pass)
[*]ShadowCaster (阴影 Pass)
[*]DepthOnly (深度 Pass)
[*]DepthNormals (深度+法线 Pass)
[*]Meta (烘焙 Pass)
[*]UniversalGBuffer (GBuffer Pass)
<hr/>输入 (Input)
UnityInput.hlsl
[*]_Time、_SinTime、_CosTime、unity_DeltaTime (时间相关)
[*]_WorldSpaceCameraPos、_ProjectionParams、_ScreenParams、_GlobalMipBias、_ZBufferParams、unity_OrthoParams (相机参数相关)
[*]unity_RenderingLayer (渲染层)
[*]unity_LightData、unity_LightIndices(光源数据相关, 光源总数、光源偏移量、光源索引)
[*]unity_SpecCube0、unity_SpecCube1 (反射探针相关)
[*]unity_Lightmap、unity_LightmapST (光照贴图缩放、偏移量)
[*]unity_ShadowMask (阴影遮罩相关)
[*]unity_SHAr、unity_SHAg、unity_SHAb、unity_SHBr、unity_SHBg、unity_SHBb、unity_SHC (球谐系数)
Input.hlsl
[*]InputData (输入数据结构体, positionWS、positionCS、normalWS、viewDirectionWS、shadowCoord、fogCoord、vertexLighting、bakedGI、normalizedScreenSpaceUV、shadowMask、tangentToWorld)
[*]_GlossyEnvironmentColor、_GlossyEnvironmentCubeMap (环境光、间接高光)
[*]_MainLightPosition、_MainLightColor、_MainLightOcclusionProbes、_MainLightLayerMask、_AdditionalLightsCount、_AdditionalLightsPosition、_AdditionalLightsColor、_AdditionalLightsAttenuation、_AdditionalLightsSpotDir、_AdditionalLightsOcclusionProbes、_AdditionalLightsLayerMasks (主光源、额外光源信息)
[*]UNITY_MATRIX_XXX (顶点变换矩阵)
SurfaceInput.hlsl
[*]_BaseMap、_BumpMap、_EmissionMap定义
<hr/>空间变换 (Space Transform)
SpaceTransforms.hlsl
[*]顶点位置P、向量Dir的模型空间Model、视图空间View、裁剪空间Projection的矩阵变换, 法线Normal的矩阵变换, 切线Tangent的矩阵变换
<hr/>光照 (Lighting)
BRDF.hlsl
[*]BRDFData (BRDF数据结构体, albedo、diffuse、specular、reflectivity、roughness)
[*]InitializeBRDFData (初始化BRDF数据结构体)
[*]DirectBRDFSpecular (直接光镜面反射计算)
Lighting.hlsl
[*]DECLARE_LIGHTMAP_OR_SH (LIGHTMAP_ON开启则定义lightmapUV, 否则定义vertexSH)
[*]OUTPUT_LIGHTMAP_UV (根据input.lightmapUV、unity_LightmapST输出到output.lightmapUV)
[*]OUTPUT_SH (根据normalWS、SampleSHVertex输出到output.vertexSH)
[*]LightingData (光照数据结构体, giColor、mainLightColor、additionalLightsColor、vertexLightingColor、emissionColor)
[*]VertexLighting (额外光逐顶点光照)
[*]UniversalFragmentPBR (PBR光照计算)
[*]MixRealtimeAndBakedGI (从LightMap中减去主光的贡献, 只对_MIXED_LIGHTING_SUBTRACTIVE烘焙模式生效)
[*]GlobalIllumination (GI计算)
[*]LightingPhysicallyBased (PBR漫反射+镜面反射)
[*]UniversalFragmentBlinnPhong (BlinnPhong光照计算)
[*]LightingLambert (BlinnPhong漫反射)
[*]LightingSpecular (BlinnPhong镜面反射)
RealtimeLights.hlsl
[*]Light (光源数据结构体, direction、color、distanceAttenuation、shadowAttenuation、layerMask)
[*]GetMeshRenderingLightLayer (获取网格渲染的光照图层LightLayer)
[*]DistanceAttenuation、AngleAttenuation (光源距离衰减、角度衰减)
[*]GetMainLight (根据_MainLightXXX, 获取主光源)
[*]MainLightShadow (计算主光源阴影)
[*]MainLightRealtimeShadow (_MAIN_LIGHT_SHADOWS_SCREEN开启采样_ScreenSpaceShadowmapTexture, 否则采样_MainLightShadowmapTexture)
[*]GetAdditionalLight (根据_AdditionalLightsXXX数组, 获取额外光源)
[*]GetPerObjectLightIndex (获取额外光源索引)
[*]GetAdditionalPerObjectLight (根据索引获取额外光源)
[*]AdditionalLightShadow (计算额外光源阴影)
[*]CalculateShadowMask (计算阴影遮罩)
GlobalIllumination.hlsl
[*]SampleSHVertex (根据normalWS计算顶点球谐光)
[*]SampleSH
[*]SampleSHPixel (根据normalWS、顶点球谐光计算像素球谐光)
[*]SampleSH
[*]SAMPLE_GI (采样GI, LIGHTMAP_ON开启SampleLightmap、LIGHTMAP_ON关闭SampleSHPixel)
[*]GlossyEnvironmentReflection
[*]CalculateIrradianceFromReflectionProbes (采样反射探针unity_SpecCube、环境立方贴图_GlossyEnvironmentCubeMap)
[*]GlobalIllumination
[*]indirectDiffuse (bakeGI)
[*]indirectSpecular (GlossyEnvironmentReflection)
[*]EnvironmentBRDF (根据indirectDiffuse、diffuse计算PBR间接光漫反射)
[*]EnvironmentBRDFSpecular (根据indirectSpecular、roughness、specular、fresnel计算PBR间接光镜面反射)
[*]MixRealtimeAndBakedGI
[*]SubtractDirectMainLightFromLightmap (从LightMap中减去主光的贡献, 只对_MIXED_LIGHTING_SUBTRACTIVE烘焙模式生效)
MetaPass.hlsl
[*]UnityMetaInput (烘焙数据结构体, albedo、emission)
[*]UnityMetaFragment (输出固有色、自发光参与烘焙计算)
<hr/>阴影 (Shadow)
Shadows.hlsl
[*]_ScreenSpaceShadowmapTexture、_MainLightShadowmapTexture、_AdditionalLightsShadowmapTexture (屏幕空间阴影贴图、主光源阴影贴图、额外光源阴影贴图)
[*]TransformWorldToShadowCoord (根据positionWS、CSM对应索引的_MainLightWorldToShadow矩阵计算出阴影贴图的纹理坐标)
[*]ComputeCascadeIndex (根据positionWS计算CSM对应索引值)
[*]MainLightShadow (计算主光源阴影)
[*]MainLightRealtimeShadow (_MAIN_LIGHT_SHADOWS_SCREEN开启采样_ScreenSpaceShadowmapTexture, 否则采样_MainLightShadowmapTexture)
[*]AdditionalLightShadow (计算额外光源阴影)
[*]AdditionalLightRealtimeShadow (采样_AdditionalLightsShadowmapTexture)
<hr/>其他 (Misc)
Macros.hlsl
[*]PI、INV_PI (圆周率、圆周率倒数)
[*]FLT_EPS、HALF_EPS (32位高精度浮点、16位半精度浮点的Epsilon值)
[*]TRANSFORM_TEX (纹理坐标缩放、偏移)
D3D11.hlsl、Vulkan.hlsl、Metal.hlsl
[*]UNITY_UV_STARTS_AT_TOP、UNITY_REVERSED_Z、UNITY_NEAR_CLIP_VALUE (1.0)、UNITY_RAW_FAR_CLIP_VALUE (0.0)
[*]VERTEXID_SEMANTIC (SV_VertexID)、INSTANCEID_SEMANTIC (SV_InstanceID)、FRONT_FACE_SEMANTIC (SV_IsFrontFace)、IS_FRONT_VFACE
[*]Flow Control Attributes
[*]UNITY_BRANCH (动态分支, 逐个判断, 选择满足条件的一侧执行, 产生跳转指令)
[*]UNITY_FLATTEN (静态分支, 执行分支所有侧, 选择满足条件的一侧的结果, 不产生跳转指令)
[*]UNITY_UNROLL (循环展开)
[*]UNITY_UNROLLX(_x) (循环展开x次)
[*]UNITY_LOOP (循环不展开)
[*]Texture & Sampler
[*]TEXTURE2D、TEXTURE2D_ARRAY (2D纹理、2D纹理数组类型声明)
[*]TEXTURECUBE、TEXTURECUBE_ARRAY (立方纹理、立方纹理数组类型声明)
[*]TEXTURE3D (3D纹理类型声明)
[*]RW_TEXTURE2D、RW_TEXTURE2D_ARRAY、RW_TEXTURE3D (可读写的2D、3D纹理类型声明, 用于Compute Shader)
GLES3.hlsl
[*]UNITY_NEAR_CLIP_VALUE (-1.0)、UNITY_RAW_FAR_CLIP_VALUE (1.0)
[*]VERTEXID_SEMANTIC (SV_VertexID)、INSTANCEID_SEMANTIC (SV_InstanceID)、FRONT_FACE_SEMANTIC (VFACE)、IS_FRONT_VFACE
Common.hlsl
[*]DegToRad、RadToDeg (角度转弧度、弧度转角度)
[*]Linear01Depth、LinearEyeDepth (深度贴图的非线性深度转为线性深度、非线性深度转为视图空间下的线性深度)
[*]Inverse (矩阵求逆)
[*]ComputeTextureLOD (根据uv、texelSize计算mipLevel)
ShaderVariablesFunctions.hlsl
[*]GetVertexPositionInputs (positionWS、positionVS、positionCS、positionNDC的计算)
[*]GetVertexNormalInputs (normalWS、tangentWS、bitangentWS的计算)
[*]GetCameraPositionWS (获取相机位置)
[*]GetWorldSpaceViewDir (相机位置V - 顶点位置P)
[*]ComputeFogFactor (根据positionCS.z值计算雾因子)
[*]MixFog (计算雾颜色)
[*]ComputeFogIntensity (根据雾模式 (FOG_LINEAR、FOG_EXP、FOG_EXP2)、雾因子计算雾强度)
[*]LinearDepthToEyeDepth (从深度贴图的深度转为视空间深度)
[*]GetNormalizedScreenSpaceUV (根据positionCS转为屏幕空间uv)
NormalReconstruction.hlsl
[*]ReconstructNormalDerivative (根据positionCS、深度贴图的深度重建法线)
[*]ViewSpacePosAtPixelPosition (根据uv、深度贴图的深度转为视图空间下的Ray)
Color.hlsl
[*]SRGBToLinear、LinearToSRGB (sRGB与Linear的颜色空间转换)
[*]RgbToHsv、HsvToRgb、RotateHue (RGB与HSV的颜色空间转换、色环Hue值旋转)
[*]ApplyLut2D (Lut校色贴图采样)
[*]NeutralTonemap、AcesTonemap (NEUTRAL模式的Tonemapping、ACES模式的Tonemapping)
[*]EncodeRGBM、DecodeRGBM (RGBM编码、RGBM解码)
<hr/>延迟渲染 (Deferred Shading)
UnityGBuffer.hlsl
[*]FragmentOutput (GBuffer输出的SV_Target数据结构体)
[*]PackMaterialFlags、UnpackMaterialFlags (材质标记的编码/解码, uint转为float)
[*]PackNormal、UnpackNormal (法线的编码/解码, 正八面体映射)
[*]SurfaceDataToGbuffer、SurfaceDataFromGbuffer (SurfaceData数据与GBuffer数据的编码/解码)
RGBAGbuffer0albedoalbedoalbedomaterialFlags (sRGB rendertarget)Gbuffer1specularspecularspecularocclusionGbuffer2encoded-normalencoded-normalencoded-normalsmoothnessGbuffer3GIGIGI (lighting buffer)
[*]BRDFDataToGbuffer、BRDFDataFromGbuffer (BRDFData数据与GBuffer数据的编码/解码)
RGBAGbuffer0diffusediffusediffusematerialFlags (sRGB rendertarget)Gbuffer1metallic/specularspecularspecularocclusionGbuffer2encoded-normalencoded-normalencoded-normalsmoothnessGbuffer3GIGIGI (lighting buffer)
StencilDeferred.shader
[*]Stencil Volume Pass (点光源、聚光源的像素遮挡剔除, 针对光源在几何体后面的情况)
[*]Deferred Punctual Light (Lit) Pass (点光源、聚光源的Lit光照计算)
[*]Deferred Punctual Light (SimpleLit) (点光源、聚光源的SimpleLit光照计算)
[*]Deferred Directional Light (Lit) (方向光源的Lit光照计算)
[*]Deferred Directional Light (SimpleLit) (方向光源的SimpleLit光照计算)
[*]Fog Pass (雾的计算)
<hr/>后处理 (Post Processing)
Common.hlsl
[*]ApplyTonemap (根据_TONEMAP_XXX宏使用对应的Tonemapping算法)
[*]ApplyColorGrading (LUT校色)
[*]ApplyFXAA (FXAA抗锯齿)
Bloom.shader
[*]Bloom Prefilter Pass (提取亮度)
[*]Bloom Blur Horizontal Pass (水平高斯模糊)
[*]Bloom Blur Vertical Pass (垂直高斯模糊)
[*]Bloom Upsample Pass (升采样)
UberPost.shader
[*]Bloom、Vignette、ColorGrading、FilmGrain、Dithering的结果合成 (P.S. FilmGrain、Dithering没有FinalPass才执行)
FinalPost.shader
[*]FXAA、FilmGrain、Dithering的结果合成 (P.S. FilmGrain、Dithering有FinalPass才执行)
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