GPU: Pre-emptively flush textures that are flushed often (to imported memory when available) (#4711)

* WIP texture pre-flush

Improve performance of TextureView GetData to buffer

Fix copy/sync ordering

Fix minor bug

Make this actually work

WIP host mapping stuff

* Fix usage flags

* message

* Cleanup 1

* Fix rebase

* Fix

* Improve pre-flush rules

* Fix pre-flush

* A lot of cleanup

* Use the host memory bits

* Select the correct memory type

* Cleanup TextureGroupHandle

* Missing comment

* Remove debugging logs

* Revert BufferHandle _value access modifier

* One interrupt action at a time.

* Support D32S8 to D24S8 conversion, safeguards

* Interrupt cannot happen in sync handle's lock

Waitable needs to be checked twice now, but this should stop it from deadlocking.

* Remove unused using

* Address some feedback

* Address feedback

* Address more feedback

* Address more feedback

* Improve sync rules

Should allow for faster sync in some cases.

src/Ryujinx.Graphics.GAL/Multithreading/ThreadedRenderer.cs

@@ -57,6 +57,7 @@ namespace Ryujinx.Graphics.GAL.Multithreading
         private int _refConsumerPtr;
 
         private Action _interruptAction;
+        private object _interruptLock = new();
 
         public event EventHandler<ScreenCaptureImageInfo> ScreenCaptured;
 
@@ -274,6 +275,24 @@ namespace Ryujinx.Graphics.GAL.Multithreading
             return handle;
         }
 
+        public BufferHandle CreateBuffer(nint pointer, int size)
+        {
+            BufferHandle handle = Buffers.CreateBufferHandle();
+            New<CreateHostBufferCommand>().Set(handle, pointer, size);
+            QueueCommand();
+
+            return handle;
+        }
+
+        public BufferHandle CreateBuffer(int size, BufferAccess access)
+        {
+            BufferHandle handle = Buffers.CreateBufferHandle();
+            New<CreateBufferAccessCommand>().Set(handle, size, access);
+            QueueCommand();
+
+            return handle;
+        }
+
         public IProgram CreateProgram(ShaderSource[] shaders, ShaderInfo info)
         {
             var program = new ThreadedProgram(this);
@@ -448,11 +467,14 @@ namespace Ryujinx.Graphics.GAL.Multithreading
             }
             else
             {
-                while (Interlocked.CompareExchange(ref _interruptAction, action, null) != null) { }
+                lock (_interruptLock)
+                {
+                    while (Interlocked.CompareExchange(ref _interruptAction, action, null) != null) { }
 
-                _galWorkAvailable.Set();
+                    _galWorkAvailable.Set();
 
-                _interruptRun.WaitOne();
+                    _interruptRun.WaitOne();
+                }
             }
         }
 
@@ -461,6 +483,11 @@ namespace Ryujinx.Graphics.GAL.Multithreading
             // Threaded renderer ignores given interrupt action, as it provides its own to the child renderer.
         }
 
+        public bool PrepareHostMapping(nint address, ulong size)
+        {
+            return _baseRenderer.PrepareHostMapping(address, size);
+        }
+
         public void Dispose()
         {
             // Dispose must happen from the render thread, after all commands have completed.