GPU: Track buffer migrations and flush source on incomplete copy (#3952)

* Track buffer migrations and flush source on incomplete copy

Makes sure that the modified range list is always from the latest iteration of the buffer, and flushes earlier iterations of a buffer if the data has not been migrated yet.

* Cleanup 1

* Reduce cost for redundant signal checks on Vulkan

* Only inherit the range list if there are pending ranges.

* Fix OpenGL

* Address Feedback

* Whoops

2 files changed, 36 insertions, 0 deletions

diff --git a/Ryujinx.Graphics.OpenGL/OpenGLRenderer.cs b/Ryujinx.Graphics.OpenGL/OpenGLRenderer.cs
index e26fe6b6..63c96fa2 100644
--- a/Ryujinx.Graphics.OpenGL/OpenGLRenderer.cs
+++ b/Ryujinx.Graphics.OpenGL/OpenGLRenderer.cs
@@ -238,6 +238,11 @@ namespace Ryujinx.Graphics.OpenGL
             _sync.Wait(id);
         }
 
+        public ulong GetCurrentSync()
+        {
+            return _sync.GetCurrent();
+        }
+
         public void Screenshot()
         {
             _window.ScreenCaptureRequested = true;
diff --git a/Ryujinx.Graphics.OpenGL/Sync.cs b/Ryujinx.Graphics.OpenGL/Sync.cs
index de94fd31..58818e6a 100644
--- a/Ryujinx.Graphics.OpenGL/Sync.cs
+++ b/Ryujinx.Graphics.OpenGL/Sync.cs
@@ -40,6 +40,37 @@ namespace Ryujinx.Graphics.OpenGL
             }
         }
 
+        public ulong GetCurrent()
+        {
+            lock (_handles)
+            {
+                ulong lastHandle = _firstHandle;
+
+                foreach (SyncHandle handle in _handles)
+                {
+                    lock (handle)
+                    {
+                        if (handle.Handle == IntPtr.Zero)
+                        {
+                            continue;
+                        }
+
+                        if (handle.ID > lastHandle)
+                        {
+                            WaitSyncStatus syncResult = GL.ClientWaitSync(handle.Handle, _syncFlags, 0);
+
+                            if (syncResult == WaitSyncStatus.AlreadySignaled)
+                            {
+                                lastHandle = handle.ID;
+                            }
+                        }
+                    }
+                }
+
+                return lastHandle;
+            }
+        }
+
         public void Wait(ulong id)
         {
             SyncHandle result = null;