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jinx/Ryujinx.Graphics/Memory/NvGpuVmmCache.cs

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using ChocolArm64.Memory;
using System;
namespace Ryujinx.Graphics.Memory
{
class NvGpuVmmCache
{
private ValueRangeSet<int> CachedRanges;
public NvGpuVmmCache()
{
CachedRanges = new ValueRangeSet<int>();
}
public bool IsRegionModified(AMemory Memory, NvGpuBufferType BufferType, long PA, long Size)
{
(bool[] Modified, long ModifiedCount) = Memory.IsRegionModified(PA, Size);
//Remove all modified ranges.
int Index = 0;
long Position = PA & ~NvGpuVmm.PageMask;
while (ModifiedCount > 0)
{
if (Modified[Index++])
{
CachedRanges.Remove(new ValueRange<int>(Position, Position + NvGpuVmm.PageSize));
ModifiedCount--;
}
Position += NvGpuVmm.PageSize;
}
//Mask has the bit set for the current resource type.
//If the region is not yet present on the list, then a new ValueRange
//is directly added with the current resource type as the only bit set.
//Otherwise, it just sets the bit for this new resource type on the current mask.
int Mask = 1 << (int)BufferType;
ValueRange<int> NewCached = new ValueRange<int>(PA, PA + Size);
ValueRange<int>[] Ranges = CachedRanges.GetAllIntersections(NewCached);
long LastEnd = NewCached.Start;
long Coverage = 0;
for (Index = 0; Index < Ranges.Length; Index++)
{
ValueRange<int> Current = Ranges[Index];
long RgStart = Math.Max(Current.Start, NewCached.Start);
long RgEnd = Math.Min(Current.End, NewCached.End);
if ((Current.Value & Mask) == 0)
{
CachedRanges.Add(new ValueRange<int>(RgStart, RgEnd, Current.Value | Mask));
}
else
{
Coverage += RgEnd - RgStart;
}
if (RgStart > LastEnd)
{
CachedRanges.Add(new ValueRange<int>(LastEnd, RgStart, Mask));
}
LastEnd = RgEnd;
}
if (LastEnd < NewCached.End)
{
CachedRanges.Add(new ValueRange<int>(LastEnd, NewCached.End, Mask));
}
return Coverage != Size;
}
}
}