Removed rendertarget/camera scaling from _ScreenSize in the shaders (was breaking NDC->CS coordinate conversion)

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Camera/HDCamera.cs

             int maxHeight = RTHandle.maxHeight;
             m_CameraScaleBias.x = (float)m_ActualWidth / maxWidth;
             m_CameraScaleBias.y = (float)m_ActualHeight / maxHeight;
-            screenSize = new Vector4(m_ActualWidth, m_ActualHeight, m_CameraScaleBias.x / m_ActualWidth, m_CameraScaleBias.y / m_ActualHeight);
+
+            screenSize = new Vector4(m_ActualWidth, m_ActualHeight, 1.0f / m_ActualWidth, 1.0f / m_ActualHeight);
         }
 
         // Warning: different views can use the same camera!

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipeline.cs

                 // If the flag hasn't been set yet on this camera, motion vectors will skip a frame.
                 hdcamera.camera.depthTextureMode |= DepthTextureMode.MotionVectors | DepthTextureMode.Depth;
 
-                cmd.SetRenderTarget(m_VelocityBuffer, m_CameraDepthStencilBuffer);
-
+                HDUtils.SetRenderTarget(cmd, hdcamera, m_VelocityBuffer, m_CameraDepthStencilBuffer);
                 RenderOpaqueRenderList(cullResults, hdcamera.camera, renderContext, cmd, HDShaderPassNames.s_MotionVectorsName, RendererConfiguration.PerObjectMotionVectors);
             }
         }
                 // If the flag hasn't been set yet on this camera, motion vectors will skip a frame.
                 hdcamera.camera.depthTextureMode |= DepthTextureMode.MotionVectors | DepthTextureMode.Depth;
 
-
-
                 PushFullScreenDebugTexture(cmd, m_VelocityBuffer, hdcamera, FullScreenDebugMode.MotionVectors);
             }
         }

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipelineAsset.asset

     enableMSAA: 0
     enableShadowMask: 0
     lightLoopSettings:
-      enableTileAndCluster: 0
+      enableTileAndCluster: 1
       enableComputeLightEvaluation: 1
       enableComputeLightVariants: 1
       enableComputeMaterialVariants: 1
     supportSSR: 1
     supportSSAO: 1
     supportSubsurfaceScattering: 1
+    supportsForwardOnly: 0
-    supportAsyncCompute: 0
+    supportsMotionVectors: 1
+    supportsStereo: 0
     lightLoopSettings:
       spotCookieSize: 128
       cookieTexArraySize: 16

ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDUtils.cs

                 cmd.ClearRenderTarget((clearFlag & ClearFlag.Depth) != 0, (clearFlag & ClearFlag.Color) != 0, clearColor);
         }
 
+        // Scaling viewport is done for auto-scaling render targets.
+        // In the context of HDRP, every auto-scaled RT is scaled against the maximum RTHandles reference size (that can only grow).
+        // When we render using a camera whose viewport is smaller than the RTHandles reference size (and thus smaller than the RT actual size), we need to set it explicitly (otherwise, native code will set the viewport at the size of the RT)
+        // For auto-scaled RTs (like for example a half-resolution RT), we need to scale this viewport accordingly.
+        // For non scaled RTs we just do nothing, the native code will set the viewport at the size of the RT anyway.
-            // Scaling viewport is done for auto-scaling render targets.
-            // In the context of HDRP, every auto-scaled RT is scaled against the maximum RTHandles reference size (that can only grow).
-            // When we render using a camera whose viewport is smaller than the RTHandles reference size (and thus smaller than the RT actual size), we need to set it explicitly (otherwise, native code will set the viewport at the size of the RT)
-            // For auto-scaled RTs (like for example a half-resolution RT), we need to scale this viewport accordingly.
-            // For non scaled RTs we just do nothing, the native code will set the viewport at the size of the RT anyway.
             if (target.useScaling)
             {
                 Debug.Assert(camera != null, "Missing HDCamera when setting up Render Target with auto-scale and Viewport.");