Use DrawProcedural() for drawing full screen

Assets/ScriptableRenderLoop/HDRenderPipeline/HDRenderPipeline.cs

             m_FilterSubsurfaceScattering.SetMatrix("_InvProjMatrix", hdCamera.invProjectionMatrix);
             m_FilterSubsurfaceScattering.SetVectorArray("_FilterKernels", kernelData);
             cmd.SetGlobalTexture("_IrradianceSource", m_CameraSubsurfaceBufferRT);
-            Utilities.DrawFullscreen(cmd, m_FilterSubsurfaceScattering, hdCamera,
+            Utilities.DrawFullScreen(cmd, m_FilterSubsurfaceScattering, hdCamera,
                                      m_CameraFilteringBufferRT, m_CameraStencilBufferRT);
 
             // Perform the horizontal SSS filtering pass, and combine diffuse and specular lighting.
-            Utilities.DrawFullscreen(cmd, m_FilterAndCombineSubsurfaceScattering, hdCamera,
+            Utilities.DrawFullScreen(cmd, m_FilterAndCombineSubsurfaceScattering, hdCamera,
                                      m_CameraColorBufferRT, m_CameraStencilBufferRT);
 
             context.ExecuteCommandBuffer(cmd);

Assets/ScriptableRenderLoop/HDRenderPipeline/Lighting/TilePass/TilePass.cs

                         // This is a debug brute force renderer to debug tile/cluster which render all the lights
                         if (outputSplitLighting)
                         {
-                            Utilities.DrawFullscreen(cmd, m_SingleDeferredMaterialMRT, hdCamera, colorBuffers, stencilBuffer);
+                            Utilities.DrawFullScreen(cmd, m_SingleDeferredMaterialMRT, hdCamera, colorBuffers, stencilBuffer);
-                            Utilities.DrawFullscreen(cmd, m_SingleDeferredMaterialSRT, hdCamera, colorBuffers[0], stencilBuffer);
+                            Utilities.DrawFullScreen(cmd, m_SingleDeferredMaterialSRT, hdCamera, colorBuffers[0], stencilBuffer);
                         }
                     }
                     else
                                 if (outputSplitLighting)
                                 {
                                     Utilities.SelectKeyword(m_DeferredDirectMaterialMRT, "USE_CLUSTERED_LIGHTLIST", "USE_FPTL_LIGHTLIST", bUseClusteredForDeferred);
-                                    Utilities.DrawFullscreen(cmd, m_DeferredDirectMaterialMRT, hdCamera, colorBuffers, stencilBuffer);
+                                    Utilities.DrawFullScreen(cmd, m_DeferredDirectMaterialMRT, hdCamera, colorBuffers, stencilBuffer);
-                                    Utilities.DrawFullscreen(cmd, m_DeferredIndirectMaterialMRT, hdCamera, colorBuffers, stencilBuffer);
+                                    Utilities.DrawFullScreen(cmd, m_DeferredIndirectMaterialMRT, hdCamera, colorBuffers, stencilBuffer);
-                                    Utilities.DrawFullscreen(cmd, m_DeferredDirectMaterialSRT, hdCamera, colorBuffers[0], stencilBuffer);
+                                    Utilities.DrawFullScreen(cmd, m_DeferredDirectMaterialSRT, hdCamera, colorBuffers[0], stencilBuffer);
-                                    Utilities.DrawFullscreen(cmd, m_DeferredIndirectMaterialSRT, hdCamera, colorBuffers[0], stencilBuffer);
+                                    Utilities.DrawFullScreen(cmd, m_DeferredIndirectMaterialSRT, hdCamera, colorBuffers[0], stencilBuffer);
                                 }
                             }
                             else
                                     Utilities.SelectKeyword(m_DeferredAllMaterialMRT, "USE_CLUSTERED_LIGHTLIST", "USE_FPTL_LIGHTLIST", bUseClusteredForDeferred);
-                                    Utilities.DrawFullscreen(cmd, m_DeferredAllMaterialMRT, hdCamera, colorBuffers, stencilBuffer);
+                                    Utilities.DrawFullScreen(cmd, m_DeferredAllMaterialMRT, hdCamera, colorBuffers, stencilBuffer);
-                                    Utilities.DrawFullscreen(cmd, m_DeferredAllMaterialSRT, hdCamera, colorBuffers[0], stencilBuffer);
+                                    Utilities.DrawFullScreen(cmd, m_DeferredAllMaterialSRT, hdCamera, colorBuffers[0], stencilBuffer);
                                 }
                             }
                         }

Assets/ScriptableRenderLoop/HDRenderPipeline/Utilities.cs

             return renderContext;
         }
 
-        static Mesh m_ScreenSpaceTriangle = null;
-
-        static Mesh GetScreenSpaceTriangle()
-        {
-            // If the assembly has been reloaded, the pointer will become NULL.
-            if (!m_ScreenSpaceTriangle)
-            {
-                m_ScreenSpaceTriangle = new Mesh
-                {
-                    // Note: neither the vertex nor the index data is actually used if the vertex shader computes vertices
-                    // using 'SV_VertexID'. However, there is currently no way to bind NULL vertex or index buffers.
-                    vertices  = new[] { new Vector3(-1, -1, 1), new Vector3(3, -1, 1), new Vector3(-1, 3, 1) },
-                    triangles = new[] { 0, 1, 2 }
-                };
-            }
-
-            return m_ScreenSpaceTriangle;
-        }
-
-        // Draws a full screen triangle as a faster alternative to drawing a full-screen quad.
-        public static void DrawFullscreen(CommandBuffer commandBuffer, Material material, HDCamera camera,
+        // Draws a full screen triangle as a faster alternative to drawing a full screen quad.
+        public static void DrawFullScreen(CommandBuffer commandBuffer, Material material, HDCamera camera,
-            commandBuffer.DrawMesh(GetScreenSpaceTriangle(), Matrix4x4.identity, material, 0, shaderPassID, properties);
+            commandBuffer.DrawProcedural(Matrix4x4.identity, material, shaderPassID, MeshTopology.Triangles, 3);
-        // Draws a full screen triangle as a faster alternative to drawing a full-screen quad.
-        public static void DrawFullscreen(CommandBuffer commandBuffer, Material material, HDCamera camera,
+        // Draws a full screen triangle as a faster alternative to drawing a full screen quad.
+        public static void DrawFullScreen(CommandBuffer commandBuffer, Material material, HDCamera camera,
-            commandBuffer.DrawMesh(GetScreenSpaceTriangle(), Matrix4x4.identity, material, 0, shaderPassID, properties);
+            commandBuffer.DrawProcedural(Matrix4x4.identity, material, shaderPassID, MeshTopology.Triangles, 3);
-        // Draws a full screen triangle as a faster alternative to drawing a full-screen quad.
-        public static void DrawFullscreen(CommandBuffer commandBuffer, Material material, HDCamera camera,
+        // Draws a full screen triangle as a faster alternative to drawing a full screen quad.
+        public static void DrawFullScreen(CommandBuffer commandBuffer, Material material, HDCamera camera,
-            commandBuffer.DrawMesh(GetScreenSpaceTriangle(), Matrix4x4.identity, material, 0, shaderPassID, properties);
+            commandBuffer.DrawProcedural(Matrix4x4.identity, material, shaderPassID, MeshTopology.Triangles, 3);
-        // Draws a full screen triangle as a faster alternative to drawing a full-screen quad.
+        // Draws a full screen triangle as a faster alternative to drawing a full screen quad.
-        public static void DrawFullscreen(CommandBuffer commandBuffer, Material material, HDCamera camera,
+        public static void DrawFullScreen(CommandBuffer commandBuffer, Material material, HDCamera camera,
                                           RenderTargetIdentifier[] colorBuffers,
                                           MaterialPropertyBlock properties = null, int shaderPassID = 0)
         {
             // no depth target ends up being bound.
-            DrawFullscreen(commandBuffer, material, camera, colorBuffers, colorBuffers[0], properties, shaderPassID);
+            DrawFullScreen(commandBuffer, material, camera, colorBuffers, colorBuffers[0], properties, shaderPassID);
         }
     }
 }