diff options
| author | TSR Berry <20988865+TSRBerry@users.noreply.github.com> | 2023-04-08 01:22:00 +0200 |
|---|---|---|
| committer | Mary <thog@protonmail.com> | 2023-04-27 23:51:14 +0200 |
| commit | cee712105850ac3385cd0091a923438167433f9f (patch) | |
| tree | 4a5274b21d8b7f938c0d0ce18736d3f2993b11b1 /src/Ryujinx.Graphics.Nvdec/Image/SurfaceCache.cs | |
| parent | cd124bda587ef09668a971fa1cac1c3f0cfc9f21 (diff) | |
Move solution and projects to src
Diffstat (limited to 'src/Ryujinx.Graphics.Nvdec/Image/SurfaceCache.cs')
| -rw-r--r-- | src/Ryujinx.Graphics.Nvdec/Image/SurfaceCache.cs | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/src/Ryujinx.Graphics.Nvdec/Image/SurfaceCache.cs b/src/Ryujinx.Graphics.Nvdec/Image/SurfaceCache.cs new file mode 100644 index 00000000..dc119673 --- /dev/null +++ b/src/Ryujinx.Graphics.Nvdec/Image/SurfaceCache.cs @@ -0,0 +1,174 @@ +using Ryujinx.Graphics.Gpu.Memory; +using Ryujinx.Graphics.Video; +using System; +using System.Diagnostics; + +namespace Ryujinx.Graphics.Nvdec.Image +{ + class SurfaceCache + { + // Must be equal to at least the maximum number of surfaces + // that can be in use simultaneously (which is 17, since H264 + // can have up to 16 reference frames, and we need another one + // for the current frame). + // Realistically, most codecs won't ever use more than 4 simultaneously. + private const int MaxItems = 17; + + private struct CacheItem + { + public int ReferenceCount; + public uint LumaOffset; + public uint ChromaOffset; + public int Width; + public int Height; + public IDecoder Owner; + public ISurface Surface; + } + + private readonly CacheItem[] _pool = new CacheItem[MaxItems]; + + private readonly MemoryManager _gmm; + + public SurfaceCache(MemoryManager gmm) + { + _gmm = gmm; + } + + public ISurface Get(IDecoder decoder, uint lumaOffset, uint chromaOffset, int width, int height) + { + lock (_pool) + { + ISurface surface = null; + + // Try to find a compatible surface with same parameters, and same offsets. + for (int i = 0; i < MaxItems; i++) + { + ref CacheItem item = ref _pool[i]; + + if (item.LumaOffset == lumaOffset && + item.ChromaOffset == chromaOffset && + item.Owner == decoder && + item.Width == width && + item.Height == height) + { + item.ReferenceCount++; + surface = item.Surface; + MoveToFront(i); + break; + } + } + + // If we failed to find a perfect match, now ignore the offsets. + // Search backwards to replace the oldest compatible surface, + // this avoids thrashing frequently used surfaces. + // Now we need to ensure that the surface is not in use, as we'll change the data. + if (surface == null) + { + for (int i = MaxItems - 1; i >= 0; i--) + { + ref CacheItem item = ref _pool[i]; + + if (item.ReferenceCount == 0 && item.Owner == decoder && item.Width == width && item.Height == height) + { + item.ReferenceCount = 1; + item.LumaOffset = lumaOffset; + item.ChromaOffset = chromaOffset; + surface = item.Surface; + + if ((lumaOffset | chromaOffset) != 0) + { + SurfaceReader.Read(_gmm, surface, lumaOffset, chromaOffset); + } + + MoveToFront(i); + break; + } + } + } + + // If everything else failed, we try to create a new surface, + // and insert it on the pool. We replace the oldest item on the + // pool to avoid thrashing frequently used surfaces. + // If even the oldest item is in use, that means that the entire pool + // is in use, in that case we throw as there's no place to insert + // the new surface. + if (surface == null) + { + if (_pool[MaxItems - 1].ReferenceCount == 0) + { + surface = decoder.CreateSurface(width, height); + + if ((lumaOffset | chromaOffset) != 0) + { + SurfaceReader.Read(_gmm, surface, lumaOffset, chromaOffset); + } + + MoveToFront(MaxItems - 1); + ref CacheItem item = ref _pool[0]; + item.Surface?.Dispose(); + item.ReferenceCount = 1; + item.LumaOffset = lumaOffset; + item.ChromaOffset = chromaOffset; + item.Width = width; + item.Height = height; + item.Owner = decoder; + item.Surface = surface; + } + else + { + throw new InvalidOperationException("No free slot on the surface pool."); + } + } + + return surface; + } + } + + public void Put(ISurface surface) + { + lock (_pool) + { + for (int i = 0; i < MaxItems; i++) + { + ref CacheItem item = ref _pool[i]; + + if (item.Surface == surface) + { + item.ReferenceCount--; + Debug.Assert(item.ReferenceCount >= 0); + break; + } + } + } + } + + private void MoveToFront(int index) + { + // If index is 0 we don't need to do anything, + // as it's already on the front. + if (index != 0) + { + CacheItem temp = _pool[index]; + Array.Copy(_pool, 0, _pool, 1, index); + _pool[0] = temp; + } + } + + public void Trim() + { + lock (_pool) + { + for (int i = 0; i < MaxItems; i++) + { + ref CacheItem item = ref _pool[i]; + + if (item.ReferenceCount == 0) + { + item.Surface?.Dispose(); + item = default; + } + } + } + } + } +} |