[GPU] Number command stream submissions in admission order

Co-authored-by: Sekai <140012992+igettingit@users.noreply.github.com>

src/SharpEmu.Libs/Gpu/GpuCommands/CommandStreamQueue.cs

@@ -39,6 +39,7 @@ public sealed class CommandStreamQueue
     private readonly GpuCommandInterpreter?[] _interpreters = new GpuCommandInterpreter?[QueueCount];
     private int _nextQueue;
     private int _submissionCount;
+    private ulong _admissionOrdinal;
     private bool _accepting = true;
     private bool _stopping;
     private bool _processing;
@@ -200,6 +201,7 @@ public sealed class CommandStreamQueue
             throw _host.Fatal($"The command stream no longer accepts submissions: queue={submission.QueueId} address=0x{submission.Address:X16}.");
         }
 
+        submission.AdmissionOrdinal = ++_admissionOrdinal;
         _queues[submission.QueueId].AddLast(submission);
         _submissionCount++;
         if (submission.Kind is not (CommandSubmissionKind.FlipPreparation or CommandSubmissionKind.FrameBoundary))

src/SharpEmu.Libs/Gpu/GpuCommands/CommandSubmission.cs

@@ -101,6 +101,8 @@ public sealed class CommandSubmission
     // The submitter's own sequence number, kept for diagnostics and the translation state.
     public ulong SubmissionId { get; }
 
+    internal ulong AdmissionOrdinal { get; set; }
+
     // Snapshots captured at submit time; the processor never reads them.
     public object? GeometrySnapshots { get; }