Better ModifiedSequence handling

This should handle PreciseEvents properly, and simplifies a few things.

Ryujinx.Graphics.Gpu/Image/Pool.cs

@@ -17,6 +17,7 @@ namespace Ryujinx.Graphics.Gpu.Image
         protected GpuContext Context;
         protected PhysicalMemory PhysicalMemory;
         protected int SequenceNumber;
+        protected int ModifiedSequenceNumber;
 
         protected T1[] Items;
         protected T2[] DescriptorCache;
@@ -42,6 +43,7 @@ namespace Ryujinx.Graphics.Gpu.Image
         private readonly CpuMultiRegionHandle _memoryTracking;
         private readonly Action<ulong, ulong> _modifiedDelegate;
 
+        private int _modifiedSequenceOffset;
         private bool _modified;
 
         /// <summary>
@@ -104,11 +106,15 @@ namespace Ryujinx.Graphics.Gpu.Image
         /// This causes invalidation of pool entries,
         /// if a modification of entries by the CPU is detected.
         /// </summary>
-        public bool SynchronizeMemory()
+        public void SynchronizeMemory()
         {
             _modified = false;
             _memoryTracking.QueryModified(_modifiedDelegate);
-            return _modified;
+
+            if (_modified)
+            {
+                UpdateModifiedSequence();
+            }
         }
 
         /// <summary>
@@ -135,6 +141,15 @@ namespace Ryujinx.Graphics.Gpu.Image
             InvalidateRangeImpl(mAddress, mSize);
         }
 
+        /// <summary>
+        /// Updates the modified sequence number using the current sequence number and offset,
+        /// indicating that it has been modified.
+        /// </summary>
+        protected void UpdateModifiedSequence()
+        {
+            ModifiedSequenceNumber = SequenceNumber + _modifiedSequenceOffset;
+        }
+
         /// <summary>
         /// An action to be performed when a precise memory access occurs to this resource.
         /// Makes sure that the dirty flags are checked.
@@ -146,7 +161,16 @@ namespace Ryujinx.Graphics.Gpu.Image
         {
             if (write && Context.SequenceNumber == SequenceNumber)
             {
-                //Common.Logging.Logger.Error?.Print(Common.Logging.LogClass.Gpu, "Precise action...");
+                if (ModifiedSequenceNumber == SequenceNumber + _modifiedSequenceOffset)
+                {
+                    // The modified sequence number is offset when PreciseActions occur so that
+                    // users checking it will see an increment and know the pool has changed since
+                    // their last look, even though the main SequenceNumber has not been changed.
+
+                    _modifiedSequenceOffset++;
+                }
+
+                // Force the pool to be checked again the next time it is used.
                 SequenceNumber--;
             }
 

Ryujinx.Graphics.Gpu/Image/SamplerPool.cs

@@ -8,7 +8,6 @@ namespace Ryujinx.Graphics.Gpu.Image
     class SamplerPool : Pool<Sampler, SamplerDescriptor>
     {
         private float _forcedAnisotropy;
-        private int _modifiedSequenceNumber;
 
         /// <summary>
         /// Constructs a new instance of the sampler pool.
@@ -53,10 +52,7 @@ namespace Ryujinx.Graphics.Gpu.Image
 
                 SequenceNumber = Context.SequenceNumber;
 
-                if (SynchronizeMemory())
+                SynchronizeMemory();
-                {
-                    _modifiedSequenceNumber = SequenceNumber;
-                }
             }
 
             Sampler sampler = Items[id];
@@ -78,7 +74,7 @@ namespace Ryujinx.Graphics.Gpu.Image
         /// <summary>
         /// Checks if the pool was modified, and returns the last sequence number where a modification was detected.
         /// </summary>
-        /// <returns>The last sequence number where a modification was detected</returns>
+        /// <returns>A number that increments each time a modification is detected</returns>
         public int CheckModified()
         {
             if (SequenceNumber != Context.SequenceNumber)
@@ -99,16 +95,13 @@ namespace Ryujinx.Graphics.Gpu.Image
                         }
                     }
 
-                    _modifiedSequenceNumber = SequenceNumber;
+                    UpdateModifiedSequence();
                 }
 
-                if (SynchronizeMemory())
+                SynchronizeMemory();
-                {
-                    _modifiedSequenceNumber = SequenceNumber;
-                }
             }
 
-            return _modifiedSequenceNumber;
+            return ModifiedSequenceNumber;
         }
 
         /// <summary>

Ryujinx.Graphics.Gpu/Image/TexturePool.cs

@@ -14,7 +14,6 @@ namespace Ryujinx.Graphics.Gpu.Image
     {
         private readonly GpuChannel _channel;
         private readonly ConcurrentQueue<Texture> _dereferenceQueue = new ConcurrentQueue<Texture>();
-        private int _modifiedSequenceNumber;
         private TextureDescriptor _defaultDescriptor;
 
         /// <summary>
@@ -106,10 +105,7 @@ namespace Ryujinx.Graphics.Gpu.Image
             {
                 SequenceNumber = Context.SequenceNumber;
 
-                if (SynchronizeMemory())
+                SynchronizeMemory();
-                {
-                    _modifiedSequenceNumber = SequenceNumber;
-                }
             }
 
             GetInternal(id, out Texture texture);
@@ -142,20 +138,17 @@ namespace Ryujinx.Graphics.Gpu.Image
         /// <summary>
         /// Checks if the pool was modified, and returns the last sequence number where a modification was detected.
         /// </summary>
-        /// <returns>The last sequence number where a modifiaction was detected</returns>
+        /// <returns>A number that increments each time a modification is detected</returns>
         public int CheckModified()
         {
             if (SequenceNumber != Context.SequenceNumber)
             {
                 SequenceNumber = Context.SequenceNumber;
 
-                if (SynchronizeMemory())
+                SynchronizeMemory();
-                {
-                    _modifiedSequenceNumber = SequenceNumber;
-                }
             }
 
-            return _modifiedSequenceNumber;
+            return ModifiedSequenceNumber;
         }
 
         /// <summary>