Smaller initial size for ModifiedRangeList & directly inherit range list (#2663)

This fixes a potential regression with the new range list changes, where the cost for creating new ones would be rather large due to creating a 1024 size array. Also reduces cost for range list inheritance by using the first existing range list as a base, rather than creating a new one then adding both lists to it.

The growth size for the RangeList is now identical to its initial size. Every 32 elements was probably a little too common - now it is 1024 for most things and 8 for the buffer modified range list.

The Unmapped and SyncMethod methods have been changed to ensure that they behave properly if the range list is set null. Cleaned up a few calls to use the null-conditional operator.

2 files changed, 26 insertions, 21 deletions

diff --git a/Ryujinx.Graphics.Gpu/Memory/Buffer.cs b/Ryujinx.Graphics.Gpu/Memory/Buffer.cs
index 76125e31..0eaf0123 100644
--- a/Ryujinx.Graphics.Gpu/Memory/Buffer.cs
+++ b/Ryujinx.Graphics.Gpu/Memory/Buffer.cs
@@ -259,10 +259,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
         /// <param name="size">The size of the region</param>
         public void ClearModified(ulong address, ulong size)
         {
-            if (_modifiedRanges != null)
-            {
-                _modifiedRanges.Clear(address, size);
-            }
+            _modifiedRanges?.Clear(address, size);
         }
 
         /// <summary>
@@ -275,7 +272,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
 
             if (_useGranular)
             {
-                _modifiedRanges.GetRanges(Address, Size, (address, size) =>
+                _modifiedRanges?.GetRanges(Address, Size, (address, size) =>
                 {
                     _memoryTrackingGranular.RegisterAction(address, size, _externalFlushDelegate);
                     SynchronizeMemory(address, size);
@@ -302,18 +299,25 @@ namespace Ryujinx.Graphics.Gpu.Memory
                     _syncActionRegistered = true;
                 }
 
-                EnsureRangeList();
-                _modifiedRanges.InheritRanges(from._modifiedRanges, (ulong address, ulong size) =>
+                if (_modifiedRanges == null)
                 {
-                    if (_useGranular)
-                    {
-                        _memoryTrackingGranular.RegisterAction(address, size, _externalFlushDelegate);
-                    }
-                    else
+                    _modifiedRanges = from._modifiedRanges;
+                    from._modifiedRanges = null;
+                }
+                else
+                {
+                    _modifiedRanges.InheritRanges(from._modifiedRanges, (ulong address, ulong size) =>
                     {
-                        _memoryTracking.RegisterAction(_externalFlushDelegate);
-                    }
-                });
+                        if (_useGranular)
+                        {
+                            _memoryTrackingGranular.RegisterAction(address, size, _externalFlushDelegate);
+                        }
+                        else
+                        {
+                            _memoryTracking.RegisterAction(_externalFlushDelegate);
+                        }
+                    });
+                }
             }
         }
 
@@ -381,10 +385,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
         /// <param name="mSize">Size of the region to force dirty</param>
         public void ForceDirty(ulong mAddress, ulong mSize)
         {
-            if (_modifiedRanges != null)
-            {
-                _modifiedRanges.Clear(mAddress, mSize);
-            }
+            _modifiedRanges?.Clear(mAddress, mSize);
 
             if (_useGranular)
             {
@@ -497,7 +498,9 @@ namespace Ryujinx.Graphics.Gpu.Memory
         /// <param name="size">Size of the unmapped region</param>
         public void Unmapped(ulong address, ulong size)
         {
-            _modifiedRanges?.Clear(address, size);
+            BufferModifiedRangeList modifiedRanges = _modifiedRanges;
+
+            modifiedRanges?.Clear(address, size);
 
             UnmappedSequence++;
         }
diff --git a/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs b/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs
index 63227431..84cf0dd8 100644
--- a/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs
+++ b/Ryujinx.Graphics.Gpu/Memory/BufferModifiedRangeList.cs
@@ -60,6 +60,8 @@ namespace Ryujinx.Graphics.Gpu.Memory
     /// </summary>
     class BufferModifiedRangeList : RangeList<BufferModifiedRange>
     {
+        private const int BackingInitialSize = 8;
+
         private GpuContext _context;
 
         private object _lock = new object();
@@ -68,7 +70,7 @@ namespace Ryujinx.Graphics.Gpu.Memory
         /// Creates a new instance of a modified range list.
         /// </summary>
         /// <param name="context">GPU context that the buffer range list belongs to</param>
-        public BufferModifiedRangeList(GpuContext context)
+        public BufferModifiedRangeList(GpuContext context) : base(BackingInitialSize)
         {
             _context = context;
         }