Texture/Vertex/Index data cache (#132)

* Initial implementation of the texture cache

* Cache vertex and index data aswell, some cleanup

* Improve handling of the cache by storing cached ranges on a list for each page

* Delete old data from the caches automatically, ensure that the cache is cleaned when the mapping/size changes, and some general cleanup

1 files changed, 61 insertions, 2 deletions

diff --git a/ChocolArm64/Memory/AMemory.cs b/ChocolArm64/Memory/AMemory.cs
index e7d46565..7e9a358a 100644
--- a/ChocolArm64/Memory/AMemory.cs
+++ b/ChocolArm64/Memory/AMemory.cs
@@ -54,7 +54,14 @@ namespace ChocolArm64.Memory
 
             ExAddrs = new HashSet<long>();
 
-            Ram = Marshal.AllocHGlobal((IntPtr)AMemoryMgr.RamSize + AMemoryMgr.PageSize);
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                Ram = AMemoryWin32.Allocate((IntPtr)AMemoryMgr.RamSize + AMemoryMgr.PageSize);
+            }
+            else
+            {
+                Ram = Marshal.AllocHGlobal((IntPtr)AMemoryMgr.RamSize + AMemoryMgr.PageSize);
+            }
 
             RamPtr = (byte*)Ram;
         }
@@ -141,6 +148,51 @@ namespace ChocolArm64.Memory
             }
         }
 
+        public long GetHostPageSize()
+        {
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return AMemoryMgr.PageSize;
+            }
+
+            IntPtr MemAddress = new IntPtr(RamPtr);
+            IntPtr MemSize    = new IntPtr(AMemoryMgr.RamSize);
+
+            long PageSize = AMemoryWin32.IsRegionModified(MemAddress, MemSize, Reset: false);
+
+            if (PageSize < 1)
+            {
+                throw new InvalidOperationException();
+            }
+
+            return PageSize;
+        }
+
+        public bool IsRegionModified(long Position, long Size)
+        {
+            if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return true;
+            }
+
+            long EndPos = Position + Size;
+
+            if ((ulong)EndPos < (ulong)Position)
+            {
+                return false;
+            }
+
+            if ((ulong)EndPos > AMemoryMgr.RamSize)
+            {
+                return false;
+            }
+
+            IntPtr MemAddress = new IntPtr(RamPtr + Position);
+            IntPtr MemSize    = new IntPtr(Size);
+
+            return AMemoryWin32.IsRegionModified(MemAddress, MemSize, Reset: true) != 0;
+        }
+
         public sbyte ReadSByte(long Position)
         {
             return (sbyte)ReadByte(Position);
@@ -640,7 +692,14 @@ namespace ChocolArm64.Memory
         {
             if (Ram != IntPtr.Zero)
             {
-                Marshal.FreeHGlobal(Ram);
+                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                {
+                    AMemoryWin32.Free(Ram);
+                }
+                else
+                {
+                    Marshal.FreeHGlobal(Ram);
+                }
 
                 Ram = IntPtr.Zero;
             }