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  • Unity Built-in转URP速查表

    转载自

    https://cuihongzhi1991.github.io/blog/2020/05/27/builtinttourp/

    本篇文章转自Teofilo Dutra编写的《From Built-in to URP》，其中有很多在写URP管线Shader时需要用到的函数，作为备忘速查表非常实用，所以记录于此。本文经过精简和翻译，不一定适用于大家，可以点击上方链接跳转至作者原文。本文是基于7.3版本的URP编写的，有些暂时还不支持的内容可能在后续版本更新迭代。

    结构

    首先要在SubShader的Tags中添加”RenderPipeline” = “UniversalPipeline”，并且使用HLSL的宏代替旧版的CG语言宏。

    Built-inURP
    CGPROGRAM / HLSLPROGRAM HLSLPROGRAM
    ENDCG / ENDHLSL ENDHLSL
    CGINCLUDE / HLSLINCLUDE HLSLINCLUDE

    Include文件的改动

    ContentBuilt-inURP
    Core Unity.cginc Packages/com.unity.render-pipelines.universal/ShaderLibrary/Core.hlsl
    Light AutoLight.cginc Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl
    Shadows AutoLight.cginc Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl
    Surface shaders Lighting.cginc 无

    其他常用的include文件:

    • Packages/com.unity.render-pipelines.core/ShaderLibrary/SpaceTransforms.hlsl
    • Packages/com.unity.render-pipelines.universal/ShaderLibrary/ShaderVariablesFunctions.hlsl
    • Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl
    • Packages/com.unity.render-pipelines.universal/ShaderLibrary/Input.hlsl
    • Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl
    • Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareDepthTexture.hlsl
    • Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareOpaqueTextue.hlsl

    光照模式

    Built-inURP
    ForwardBase UniversalForward
    ForwardAdd 无
    Deferred and related UniversalGBuffer seems to have just been added to URP
    Vertex and related 无
    ShadowCaster ShadowCaster
    MotionVectors 暂不支持

    URP其他支持的光照模式：

    • DepthOnly
    • Meta (用于烘焙光照贴图)
    • Universal2D

    变体(Variants)

    URP支持着色器的变体，可以使用#pragma multi_compile宏实现编译不同需求下的着色器，常见的内置关键字有：

    • _MAIN_LIGHT_SHADOWS
    • _MAIN_LIGHT_SHADOWS_CASCADE
    • _ADDITIONAL_LIGHTS_VERTEX
    • _ADDITIONAL_LIGHTS
    • _ADDITIONAL_LIGHT_SHADOWS
    • _SHADOWS_SOFT
    • _MIXED_LIGHTING_SUBTRACTIVE

    预定义的着色器预处理宏

    辅助宏(Helpers)

    Built-inURP
    UNITY_PROJ_COORD(a) 无，使用 a.xy/a.w 来代替
    UNITY_INITIALIZE_OUTPUT(type, name) ZERO_INITIALIZE(type, name)

    阴影贴图

    需要包含 Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl

    Built-inURP
    UNITY_DECLARE_SHADOWMAP(tex) TEXTURE2D_SHADOW_PARAM(textureName, samplerName)
    UNITY_SAMPLE_SHADOW(tex, uv) SAMPLE_TEXTURE2D_SHADOW(textureName, samplerName, coord3)
    UNITY_SAMPLE_SHADOW_PROJ(tex, uv) SAMPLE_TEXTURE2D_SHADOW(textureName, samplerName, coord4.xyz/coord4.w)

    纹理/采样器的声明宏

    Built-inURP
    UNITY_DECLARE_TEX2D(name) TEXTURE2D(textureName); SAMPLER(samplerName);
    UNITY_DECLARE_TEX2D_NOSAMPLER(name) TEXTURE2D(textureName);
    UNITY_DECLARE_TEX2DARRAY(name) TEXTURE2D_ARRAY(textureName); SAMPLER(samplerName);
    UNITY_SAMPLE_TEX2D(name, uv) SAMPLE_TEXTURE2D(textureName, samplerName, coord2)
    UNITY_SAMPLE_TEX2D_SAMPLER(name, samplername, uv) SAMPLE_TEXTURE2D(textureName, samplerName, coord2)
    UNITY_SAMPLE_TEX2DARRAY(name, uv) SAMPLE_TEXTURE2D_ARRAY(textureName, samplerName, coord2, index)
    UNITY_SAMPLE_TEX2DARRAY_LOD(name, uv, lod) SAMPLE_TEXTURE2D_ARRAY_LOD(textureName, samplerName, coord2, index, lod)

    内置的着色器辅助函数

    可以在 Packages/com.unity.render-pipelines.core/ShaderLibrary/SpaceTransforms.hlsl 看到下方的所有函数

    顶点变换函数

    Built-inURP
    float4 UnityObjectToClipPos(float3 pos) float4 TransformObjectToHClip(float3 positionOS)
    float3 UnityObjectToViewPos(float3 pos) TransformWorldToView(TransformObjectToWorld(positionOS))

    泛用的辅助函数

    Built-inURPInclude
    float3 WorldSpaceViewDir (float4 v) float3 GetWorldSpaceViewDir(float3 positionWS) Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/ShaderVariablesFunctions.hlsl”
    float3 ObjSpaceViewDir (float4 v) 无，使用 TransformWorldToObject(GetCameraPositionWS()) - objectSpacePosition;  
    float2 ParallaxOffset (half h, half height, half3 viewDir) 可能没有，从 UnityCG.cginc 复制  
    fixed Luminance (fixed3 c) real Luminance(real3 linearRgb) Include “Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl”
    fixed3 DecodeLightmap (fixed4 color) real3 DecodeLightmap(real4 encodedIlluminance, real4 decodeInstructions) Include “Packages/com.unity.render-pipelines.core/ShaderLibrary/EntityLighting.hlsl” URP中decodeInstructions 为 half4(LIGHTMAP_HDR_MULTIPLIER, LIGHTMAP_HDR_EXPONENT, 0.0h, 0.0h)
    float4 EncodeFloatRGBA (float v) 可能没有， 从 UnityCG.cginc 复制  
    float DecodeFloatRGBA (float4 enc) 可能没有， 从 UnityCG.cginc 复制  
    float2 EncodeFloatRG (float v) 可能没有， 从 UnityCG.cginc 复制  
    float DecodeFloatRG (float2 enc) 可能没有， 从 UnityCG.cginc 复制  
    float2 EncodeViewNormalStereo (float3 n) 可能没有， 从 UnityCG.cginc 复制  
    float3 DecodeViewNormalStereo (float4 enc4) 可能没有， 从 UnityCG.cginc 复制  

    前向渲染辅助函数

    Built-inURPInclude
    float3 WorldSpaceLightDir (float4 v) _MainLightPosition.xyz - TransformObjectToWorld(objectSpacePosition) Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Input.hlsl”
    float3 ObjSpaceLightDir (float4 v) TransformWorldToObject(_MainLightPosition.xyz) - objectSpacePosition Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Input.hlsl”
    float3 Shade4PointLights (…) 无，可尝试用half3 VertexLighting(float3 positionWS, half3 normalWS) include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl”

    屏幕空间辅助函数

    Built-inURPInclude
    float4 ComputeScreenPos (float4 clipPos) float4 ComputeScreenPos(float4 positionCS) Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/ShaderVariablesFunctions.hlsl”
    float4 ComputeGrabScreenPos (float4 clipPos) 无  

    顶点光照的辅助函数

    Built-inURPInclude
    float3 ShadeVertexLights (float4 vertex, float3 normal) 无，可尝试用 UNITY_LIGHTMODEL_AMBIENT.xyz + VertexLighting(…) include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl”

    可以在 Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl 中找到一些通用函数

    内置的着色器变量

    Built-inURPInclude
    _LightColor0 _MainLightColor Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Input.hlsl”
    _WorldSpaceLightPos0 _MainLightPosition Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Input.hlsl”
    _LightMatrix0 可能还不支持  
    unity_4LightPosX0, unity_4LightPosY0, unity_4LightPosZ0 URP中，额外的灯光存储在一个数组或缓冲中(取决于平台),使用Light GetAdditionalLight(uint i, float3 positionWS)获取光照信息 Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl”
    unity_4LightAtten0 URP中，额外的灯光存储在一个数组或缓冲中(取决于平台),使用Light GetAdditionalLight(uint i, float3 positionWS)获取光照信息 Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl”
    unity_LightColor URP中，额外的灯光存储在一个数组或缓冲中(取决于平台),使用Light GetAdditionalLight(uint i, float3 positionWS)获取光照信息 Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl”
    unity_WorldToShadow float4x4 _MainLightWorldToShadow[MAX_SHADOW_CASCADES + 1] or _AdditionalLightsWorldToShadow[MAX_VISIBLE_LIGHTS] Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl”

    可以使用GetAdditionalLight(…)获取额外的光源，也可以使用GetAdditionalLightsCount()查询额外的光源数量。

    其他方法

    阴影

    更多阴影相关函数可以查看 Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl

    Built-inURP
    UNITY_SHADOW_COORDS(x) 可能没有，可以写作float4 shadowCoord : TEXCOORD0;
    TRANSFER_SHADOW(a) a.shadowCoord = TransformWorldToShadowCoord(worldSpacePosition)
    SHADOWS_SCREEN 暂不支持

    雾

    更多雾相关的函数可以查看 Packages/com.unity.render-pipelines.universal/ShaderLibrary/ShaderVariablesFunctions.hlsl

    Built-inURP
    UNITY_FOG_COORDS(x) 可能没有，可以写作float fogCoord : TEXCOORD0;
    UNITY_TRANSFER_FOG(o, outpos) o.fogCoord = ComputeFogFactor(clipSpacePosition.z);
    UNITY_APPLY_FOG(coord, col) color = MixFog(color, i.fogCoord);

    深度

    可以包含 “Packages/com.unity.render-pipelines.universal/ShaderLibrary/DeclareDepthTexture.hlsl” 并使用 _CameraDepthTexture来调用深度纹理。也可以使用SampleSceneDepth(…) 和 LoadSceneDepth(…)。

    Built-inURPInclude
    LinearEyeDepth(sceneZ) LinearEyeDepth(sceneZ, _ZBufferParams) Include “Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl”
    Linear01Depth(sceneZ) Linear01Depth(sceneZ, _ZBufferParams) Include “Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl”

    其他

    Built-inURPInclude
    ShadeSH9(normal) SampleSH(normal) Include “Packages/com.unity.render-pipelines.universal/ShaderLibrary/Lighting.hlsl”
    unity_ColorSpaceLuminance 无，使用Luminance() Include “Packages/com.unity.render-pipelines.core/ShaderLibrary/Color.hlsl”

    后期/特效

    URP不支持OnPreCull, OnPreRender, OnPostRender 和 OnRenderImage. 支持 OnRenderObject 和 OnWillRenderObject。RenderPipelineManager提供了渲染管线中注入的位置：

    • beginCameraRendering(ScriptableRenderContext context, Camera camera)
    • endCameraRendering(ScriptableRenderContext context, Camera camera)
    • beginFrameRendering(ScriptableRenderContext context,Camera[] cameras)
    • endFrameRendering(ScriptableRenderContext context,Camera[] cameras)

    例如：

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    void OnEnable()
    {
    	RenderPipelineManager.beginCameraRendering += MyCameraRendering;
    }

    void OnDisable()
    {
    	RenderPipelineManager.beginCameraRendering -= MyCameraRendering;
    }

    void MyCameraRendering(ScriptableRenderContext context, Camera camera)
    {
    	...
    	if(camera == myEffectCamera)
    	{
    	...
            UniversalRenderPipeline.RenderSingleCamera(context, camera);
    	}
    	...
    }
     


    另外，可以创建ScriptableRendererFeature来实现后期处理效果。可以在管线的不同阶段注入ScriptableRenderPasses：

    • BeforeRendering
    • BeforeRenderingShadows
    • AfterRenderingShadows
    • BeforeRenderingPrepasses
    • AfterRenderingPrePasses
    • BeforeRenderingOpaques
    • AfterRenderingOpaques
    • BeforeRenderingSkybox
    • AfterRenderingSkybox
    • BeforeRenderingTransparents
    • AfterRenderingTransparents
    • BeforeRenderingPostProcessing
    • AfterRenderingPostProcessing
    • AfterRendering

    下面是一个示例：

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    public class CustomRenderPassFeature : ScriptableRendererFeature
    {
        class CustomRenderPass : ScriptableRenderPass
        {
            CustomRPSettings _CustomRPSettings;
            RenderTargetHandle _TemporaryColorTexture;

            private RenderTargetIdentifier _Source;
            private RenderTargetHandle _Destination;

            public CustomRenderPass(CustomRPSettings settings)
            {
                _CustomRPSettings = settings;
            }

            public void Setup(RenderTargetIdentifier source, RenderTargetHandle destination)
            {
                _Source = source;
                _Destination = destination;
            }

            public override void Configure(CommandBuffer cmd, RenderTextureDescriptor cameraTextureDescriptor)
            {
                _TemporaryColorTexture.Init("_TemporaryColorTexture");
            }

            public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
            {
                CommandBuffer cmd = CommandBufferPool.Get("My Pass");

                if (_Destination == RenderTargetHandle.CameraTarget)
                {
                    cmd.GetTemporaryRT(_TemporaryColorTexture.id, renderingData.cameraData.cameraTargetDescriptor, FilterMode.Point);
                    cmd.Blit(_Source, _TemporaryColorTexture.Identifier());
                    cmd.Blit(_TemporaryColorTexture.Identifier(), _Source, _CustomRPSettings.m_Material);
                }
                else
                {
                    cmd.Blit(_Source, _Destination.Identifier(), _CustomRPSettings.m_Material, 0);
                }

                context.ExecuteCommandBuffer(cmd);
                CommandBufferPool.Release(cmd);
            }

            public override void FrameCleanup(CommandBuffer cmd)
            {
                if (_Destination == RenderTargetHandle.CameraTarget)
                {
                    cmd.ReleaseTemporaryRT(_TemporaryColorTexture.id);
                }
            }
        }

        [System.Serializable]
        public class CustomRPSettings
        {
            public Material m_Material;
        }

        public CustomRPSettings m_CustomRPSettings = new CustomRPSettings();
        CustomRenderPass _ScriptablePass;

        public override void Create()
        {
            _ScriptablePass = new CustomRenderPass(m_CustomRPSettings);

            _ScriptablePass.renderPassEvent = RenderPassEvent.AfterRenderingOpaques;
        }

        public override void AddRenderPasses(ScriptableRenderer renderer, ref RenderingData renderingData)
        {
            _ScriptablePass.Setup(renderer.cameraColorTarget, RenderTargetHandle.CameraTarget);
            renderer.EnqueuePass(_ScriptablePass);
        }
    }
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  • 原文地址：https://www.cnblogs.com/sanyejun/p/15204668.html
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