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.Gpu/Memory/Buffer.cs

@@ -1,5 +1,6 @@
 using Ryujinx.Cpu.Tracking;
 using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Gpu.Synchronization;
 using Ryujinx.Memory.Range;
 using Ryujinx.Memory.Tracking;
 using System;
@@ -11,7 +12,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
     /// <summary>
     /// Buffer, used to store vertex and index data, uniform and storage buffers, and others.
     /// </summary>
-    class Buffer : IRange, IDisposable
+    class Buffer : IRange, ISyncActionHandler, IDisposable
     {
         private const ulong GranularBufferThreshold = 4096;
 
@@ -248,7 +249,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
 
             if (!_syncActionRegistered)
             {
-                _context.RegisterSyncAction(SyncAction);
+                _context.RegisterSyncAction(this);
                 _syncActionRegistered = true;
             }
         }
@@ -267,7 +268,8 @@ namespace Ryujinx.Graphics.Gpu.Memory
         /// Action to be performed when a syncpoint is reached after modification.
         /// This will register read/write tracking to flush the buffer from GPU when its memory is used.
         /// </summary>
-        private void SyncAction()
+        /// <inheritdoc/>
+        public bool SyncAction(bool syncpoint)
         {
             _syncActionRegistered = false;
 
@@ -284,6 +286,8 @@ namespace Ryujinx.Graphics.Gpu.Memory
                 _memoryTracking.RegisterAction(_externalFlushDelegate);
                 SynchronizeMemory(Address, Size);
             }
+
+            return true;
         }
 
         /// <summary>
@@ -296,7 +300,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
             {
                 if (from._syncActionRegistered && !_syncActionRegistered)
                 {
-                    _context.RegisterSyncAction(SyncAction);
+                    _context.RegisterSyncAction(this);
                     _syncActionRegistered = true;
                 }
 

src/Ryujinx.Graphics.Gpu/Memory/PhysicalMemory.cs

@@ -8,6 +8,7 @@ using Ryujinx.Memory.Tracking;
 using System;
 using System.Collections.Generic;
 using System.Runtime.InteropServices;
+using System.Linq;
 using System.Threading;
 
 namespace Ryujinx.Graphics.Gpu.Memory
@@ -82,6 +83,34 @@ namespace Ryujinx.Graphics.Gpu.Memory
             }
         }
 
+        /// <summary>
+        /// Gets a host pointer for a given range of application memory.
+        /// If the memory region is not a single contiguous block, this method returns 0.
+        /// </summary>
+        /// <remarks>
+        /// Getting a host pointer is unsafe. It should be considered invalid immediately if the GPU memory is unmapped.
+        /// </remarks>
+        /// <param name="range">Ranges of physical memory where the target data is located</param>
+        /// <returns>Pointer to the range of memory</returns>
+        public nint GetHostPointer(MultiRange range)
+        {
+            if (range.Count == 1)
+            {
+                var singleRange = range.GetSubRange(0);
+                if (singleRange.Address != MemoryManager.PteUnmapped)
+                {
+                    var regions = _cpuMemory.GetHostRegions(singleRange.Address, singleRange.Size);
+
+                    if (regions != null && regions.Count() == 1)
+                    {
+                        return (nint)regions.First().Address;
+                    }
+                }
+            }
+
+            return 0;
+        }
+
         /// <summary>
         /// Gets a span of data from the application process.
         /// </summary>