Add scene selection pass to HDRP

For lit, lit tessellation, unlit, layeredLit, LayereLitTessellation

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/BuildPlayer/HDRPVariantStripper.cs

             m_StripperFuncs.Add("HDRenderPipeline/LitTessellation", LitShaderStripper);
             m_StripperFuncs.Add("HDRenderPipeline/LayeredLit", LitShaderStripper);
             m_StripperFuncs.Add("HDRenderPipeline/LayeredLitTessellation", LitShaderStripper);
+            m_StripperFuncs.Add("HDRenderPipeline/Unlit", UnlitShaderStripper);
 
             m_Transparent = new ShaderKeyword("_SURFACE_TYPE_TRANSPARENT");
             m_DebugDisplay = new ShaderKeyword("DEBUG_DISPLAY");
             //m_FeatureSSS = new ShaderKeyword("_MATERIAL_FEATURE_SUBSURFACE_SCATTERING");
         }
 
+        bool UnlitShaderStripper(Shader shader, ShaderSnippetData snippet, ShaderCompilerData inputData)
+        {
+            bool isSceneSelectionPass = snippet.passName == "SceneSelectionPass";
+
+            if (isSceneSelectionPass)
+                return true;
+
+            return false;
+        }
+
+            bool isSceneSelectionPass = snippet.passName == "SceneSelectionPass";
+
+            if (isSceneSelectionPass)
+                return true;
+
             bool isGBufferPass = snippet.passName == "GBuffer";
             bool isForwardPass = snippet.passName == "Forward";
             bool isTransparentForwardPass = snippet.passName == "TransparentDepthPostpass" || snippet.passName == "TransparentBackface" || snippet.passName == "TransparentDepthPrepass";

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/LayeredLit.shader

         // This tags allow to use the shader replacement features
         Tags{ "RenderPipeline" = "HDRenderPipeline" "RenderType" = "HDLitShader" }
 
+        Pass
+        {
+            Name "SceneSelectionPass"
+            Tags{ "LightMode" = "SceneSelectionPass" }
+
+            Cull[_CullMode]
+
+            ZWrite On
+
+            ColorMask 0
+
+            HLSLPROGRAM
+
+            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SCENESELECTIONPASS // This will drive the output of the scene selection shader
+            #include "../../ShaderVariables.hlsl"
+            #include "../../Material/Material.hlsl"
+            #include "../Lit/ShaderPass/LitDepthPass.hlsl"
+            #include "LayeredLitData.hlsl"
+            #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
+
+            ENDHLSL
+        }
+
         // Caution: The outline selection in the editor use the vertex shader/hull/domain shader of the first pass declare. So it should not bethe  meta pass.
         Pass
         {
 
         #ifdef _ALPHATEST_ON
             // When we have alpha test, we will force a depth prepass so we always bypass the clip instruction in the GBuffer
-            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST 
+            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
         #endif
 
             #define SHADERPASS SHADERPASS_GBUFFER

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/LayeredLit/LayeredLitTessellation.shader

         // This tags allow to use the shader replacement features
         Tags{ "RenderPipeline" = "HDRenderPipeline" "RenderType" = "HDLitShader" }
 
+        Pass
+        {
+            Name "SceneSelectionPass"
+            Tags{ "LightMode" = "SceneSelectionPass" }
+
+            Cull[_CullMode]
+
+            ZWrite On
+
+            ColorMask 0
+
+            HLSLPROGRAM
+
+            #pragma hull Hull
+            #pragma domain Domain
+
+            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SCENESELECTIONPASS // This will drive the output of the scene selection shader
+            #include "../../ShaderVariables.hlsl"
+            #include "../../Material/Material.hlsl"
+            #include "../Lit/ShaderPass/LitDepthPass.hlsl"
+            #include "LayeredLitData.hlsl"
+            #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
+
+            ENDHLSL
+        }
+
          // Caution: The outline selection in the editor use the vertex shader/hull/domain shader of the first pass declare. So it should not bethe  meta pass.
         Pass
         {
 
         #ifdef _ALPHATEST_ON
             // When we have alpha test, we will force a depth prepass so we always bypass the clip instruction in the GBuffer
-            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST 
+            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
         #endif
 
             #define SHADERPASS SHADERPASS_GBUFFER

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/Lit.shader

         // This tags allow to use the shader replacement features
         Tags{ "RenderPipeline"="HDRenderPipeline" "RenderType" = "HDLitShader" }
 
+        Pass
+        {
+            Name "SceneSelectionPass" // Name is not used
+            Tags { "LightMode" = "SceneSelectionPass" }
+
+            Cull Off
+
+            HLSLPROGRAM
+
+            // We reuse depth prepass for the scene selection, allow to handle alpha correctly as well as tessellation and vertex animation
+            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SCENESELECTIONPASS // This will drive the output of the scene selection shader
+            #include "../../ShaderVariables.hlsl"
+            #include "../../Material/Material.hlsl"
+            #include "ShaderPass/LitDepthPass.hlsl"
+            #include "LitData.hlsl"
+            #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
+
+            ENDHLSL
+        }
+
         // Caution: The outline selection in the editor use the vertex shader/hull/domain shader of the first pass declare. So it should not bethe  meta pass.
         Pass
         {
 
         #ifdef _ALPHATEST_ON
             // When we have alpha test, we will force a depth prepass so we always bypass the clip instruction in the GBuffer
-            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST 
+            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
         #endif
 
             #define SHADERPASS SHADERPASS_GBUFFER

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/LitProperties.hlsl

 float _TessellationTilingScale;
 #endif
 
+// Following two variables are feeded by the C++ Editor for Scene selection
+int _ObjectId;
+int _PassValue;
+
 CBUFFER_END

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Lit/LitTessellation.shader

         // This tags allow to use the shader replacement features
         Tags{ "RenderPipeline" = "HDRenderPipeline" "RenderType" = "HDLitShader" }
 
+        Pass
+        {
+            Name "SceneSelectionPass"
+            Tags{ "LightMode" = "SceneSelectionPass" }
+
+            Cull[_CullMode]
+
+            ZWrite On
+
+            ColorMask 0
+
+            HLSLPROGRAM
+
+            #pragma hull Hull
+            #pragma domain Domain
+
+            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SCENESELECTIONPASS // This will drive the output of the scene selection shader
+            #include "../../ShaderVariables.hlsl"
+            #include "../../Material/Material.hlsl"
+            #include "ShaderPass/LitDepthPass.hlsl"
+            #include "LitData.hlsl"
+            #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
+
+            ENDHLSL
+        }
+
         // Caution: The outline selection in the editor use the vertex shader/hull/domain shader of the first pass declare. So it should not bethe  meta pass.
         Pass
         {
 
         #ifdef _ALPHATEST_ON
             // When we have alpha test, we will force a depth prepass so we always bypass the clip instruction in the GBuffer
-            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST 
+            #define SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
         #endif
 
             #define SHADERPASS SHADERPASS_GBUFFER

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Unlit/Unlit.shader

 
         Pass
         {
+            Name "SceneSelectionPass"
+            Tags{ "LightMode" = "SceneSelectionPass" }
+
+            Cull[_CullMode]
+
+            ZWrite On
+
+            HLSLPROGRAM
+
+            #define SHADERPASS SHADERPASS_DEPTH_ONLY
+            #define SCENESELECTIONPASS // This will drive the output of the scene selection shader
+            #include "../../Material/Material.hlsl"
+            #include "ShaderPass/UnlitDepthPass.hlsl"
+            #include "UnlitData.hlsl"
+            #include "../../ShaderPass/ShaderPassDepthOnly.hlsl"
+
+            ENDHLSL
+        }
+
+        Pass
+        {
             Name "Depth prepass"
             Tags{ "LightMode" = "DepthForwardOnly" }
 

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Material/Unlit/UnlitProperties.hlsl

 // TODO: Fix the code in legacy unity so we can customize the behavior for GI
 float3 _EmissionColor;
 
+// Following two variables are feeded by the C++ Editor for Scene selection
+int _ObjectId;
+int _PassValue;
+
 CBUFFER_END

ScriptableRenderPipeline/HDRenderPipeline/HDRP/ShaderPass/ShaderPassDepthOnly.hlsl

 #ifdef _DEPTHOFFSET_ON
     outputDepth = posInput.deviceDepth;
 #endif
+
+    // We use depth prepass for scene selection in the editor, this code allow to output the outline correctly
+#ifdef SCENESELECTIONPASS
+    outColor = float4(_ObjectId, _PassValue, 1, 1);
+#endif
 }

Tests/Scripts/GraphicTests/HDRenderPipeline.meta

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Tests/GraphicsTests/RenderPipeline/HDRenderPipeline/Scenes/2xxx_Lighting/2401_Light_on_Tesselation.meta

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