Fix rendergraph on consoles when motion vectors are enabled (#2076)

* Fix

* reput the branch

* changelog

* Revert history change

Author: FrancescoC-unity

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -117,6 +117,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed issue with box light not visible if range is below one and range attenuation is off.
 - Fixed alpha not having TAA applied to it.
 - Fixed issue with bloom showing a thin black line after rescaling window. 
+- Fixed rendergraph motion vector resolve.
 
 ### Changed
 - Preparation pass for RTSSShadows to be supported by render graph.

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.Prepass.cs

@@ -610,6 +610,8 @@ void ResolvePrepassBuffers(RenderGraph renderGraph, HDCamera hdCamera, ref Prepa
                 passData.normalBuffer = builder.UseColorBuffer(CreateNormalBuffer(renderGraph, false), 1);
                 if (passData.needMotionVectors)
                     passData.motionVectorsBuffer = builder.UseColorBuffer(CreateMotionVectorBuffer(renderGraph, false, false), 2);
+                else
+                    passData.motionVectorsBuffer = TextureHandle.nullHandle;
 
                 passData.normalBufferMSAA = builder.ReadTexture(output.normalBuffer);
                 passData.depthAsColorBufferMSAA = builder.ReadTexture(output.depthAsColor);
@@ -626,8 +628,12 @@ void ResolvePrepassBuffers(RenderGraph renderGraph, HDCamera hdCamera, ref Prepa
                 {
                     data.depthResolveMaterial.SetTexture(HDShaderIDs._NormalTextureMS, data.normalBufferMSAA);
                     data.depthResolveMaterial.SetTexture(HDShaderIDs._DepthTextureMS, data.depthAsColorBufferMSAA);
-                    if (data.needMotionVectors)
+                    if (passData.needMotionVectors)
+                    {
                         data.depthResolveMaterial.SetTexture(HDShaderIDs._MotionVectorTextureMS, data.motionVectorBufferMSAA);
+                    }
+
+                    CoreUtils.SetKeyword(context.cmd, "_HAS_MOTION_VECTORS", data.needMotionVectors);
 
                     context.cmd.DrawProcedural(Matrix4x4.identity, data.depthResolveMaterial, data.depthResolvePassIndex, MeshTopology.Triangles, 3, 1);
                 });