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/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>