Simplified backbuffer selection for interpolation source

Runtime/FrameInterpolation/FrameInterpolation.cs

@@ -86,6 +86,17 @@ namespace FidelityFX.FrameGen
             public BackbufferTransferFunction backbufferTransferFunction;
             public Vector2 minMaxLuminance;
             public ulong frameID;
+
+            public ref ResourceView InterpolationSource
+            {
+                get
+                {
+                    if (currentBackBuffer_HUDLess.IsValid)
+                        return ref currentBackBuffer_HUDLess;
+                    
+                    return ref currentBackBuffer;
+                }
+            }
         }
         
         public enum BackbufferTransferFunction

Runtime/FrameInterpolation/FrameInterpolationContext.cs

@@ -227,9 +227,8 @@ namespace FidelityFX.FrameGen
             }
             
             // Store current buffer
-            ref var backBuf = ref dispatchDescription.currentBackBuffer;
-            ref var bbNoHud = ref dispatchDescription.currentBackBuffer_HUDLess;
-            commandBuffer.CopyTexture(bbNoHud.IsValid ? bbNoHud.RenderTarget : backBuf.RenderTarget, _resources.PreviousInterpolationSource);
+            ref var backBuf = ref dispatchDescription.InterpolationSource;
+            commandBuffer.CopyTexture(backBuf.RenderTarget, _resources.PreviousInterpolationSource);
 
             commandBuffer.EndSample(_sampler);
         }

Runtime/FrameInterpolation/FrameInterpolationPass.cs

@@ -60,12 +60,7 @@ namespace FidelityFX.FrameGen
 
         protected void BindCurrentInterpolationSource(CommandBuffer commandBuffer, FrameInterpolation.DispatchDescription dispatchParams)
         {
-            ref var backBuf = ref dispatchParams.currentBackBuffer;
-            ref var bbNoHud = ref dispatchParams.currentBackBuffer_HUDLess;
-            
-            if (bbNoHud.IsValid)
-                commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, FrameInterpolationShaderIDs.SrvCurrentInterpolationSource, bbNoHud.RenderTarget, bbNoHud.MipLevel, bbNoHud.SubElement);
-            else
+            ref var backBuf = ref dispatchParams.InterpolationSource;
             commandBuffer.SetComputeTextureParam(ComputeShader, KernelIndex, FrameInterpolationShaderIDs.SrvCurrentInterpolationSource, backBuf.RenderTarget, backBuf.MipLevel, backBuf.SubElement);
         }