Match texture if the physical range is the same (#1934)

* Match texture if the physical range is the same

* XML docs and comments

Ryujinx.Graphics.Gpu/Image/TextureManager.cs

@@ -685,13 +685,27 @@ namespace Ryujinx.Graphics.Gpu.Image
             {
                 Texture overlap = _textureOverlaps[index];
 
-                bool rangeMatches = range != null ? overlap.Range.Equals(range.Value) : overlap.Info.GpuAddress == info.GpuAddress;
+                TextureMatchQuality matchQuality = overlap.IsExactMatch(info, flags);
-                if (!rangeMatches)
+
+                if (matchQuality != TextureMatchQuality.NoMatch)
+                {
+                    // If the parameters match, we need to make sure the texture is mapped to the same memory regions.
+
+                    // If a range of memory was supplied, just check if the ranges match.
+                    if (range != null && !overlap.Range.Equals(range.Value))
                     {
                         continue;
                     }
 
-                TextureMatchQuality matchQuality = overlap.IsExactMatch(info, flags);
+                    // If no range was supplied, we can check if the GPU virtual address match. If they do,
+                    // we know the textures are located at the same memory region.
+                    // If they don't, it may still be mapped to the same physical region, so we
+                    // do a more expensive check to tell if they are mapped into the same physical regions.
+                    if (overlap.Info.GpuAddress != info.GpuAddress && !_context.MemoryManager.CompareRange(overlap.Range, info.GpuAddress))
+                    {
+                        continue;
+                    }
+                }
 
                 if (matchQuality == TextureMatchQuality.Perfect)
                 {

Ryujinx.Graphics.Gpu/Memory/MemoryManager.cs

@@ -343,6 +343,39 @@ namespace Ryujinx.Graphics.Gpu.Memory
             return new MultiRange(regions.ToArray());
         }
 
+        /// <summary>
+        /// Checks if a given GPU virtual memory range is mapped to the same physical regions
+        /// as the specified physical memory multi-range.
+        /// </summary>
+        /// <param name="range">Physical memory multi-range</param>
+        /// <param name="va">GPU virtual memory address</param>
+        /// <returns>True if the virtual memory region is mapped into the specified physical one, false otherwise</returns>
+        public bool CompareRange(MultiRange range, ulong va)
+        {
+            va &= ~PageMask;
+
+            for (int i = 0; i < range.Count; i++)
+            {
+                MemoryRange currentRange = range.GetSubRange(i);
+
+                ulong address = currentRange.Address & ~PageMask;
+                ulong endAddress = (currentRange.EndAddress + PageMask) & ~PageMask;
+
+                while (address < endAddress)
+                {
+                    if (Translate(va) != address)
+                    {
+                        return false;
+                    }
+
+                    va += PageSize;
+                    address += PageSize;
+                }
+            }
+
+            return true;
+        }
+
         /// <summary>
         /// Validates a GPU virtual address.
         /// </summary>