1 files changed, 90 insertions, 0 deletions
diff --git a/src/Ryujinx.Graphics.Nvdec/Vp9Decoder.cs b/src/Ryujinx.Graphics.Nvdec/Vp9Decoder.cs
new file mode 100644
index 00000000..9bb3529e
--- /dev/null
+++ b/src/Ryujinx.Graphics.Nvdec/Vp9Decoder.cs
@@ -0,0 +1,90 @@
+using Ryujinx.Common;
+using Ryujinx.Graphics.Gpu.Memory;
+using Ryujinx.Graphics.Nvdec.Image;
+using Ryujinx.Graphics.Nvdec.Types.Vp9;
+using Ryujinx.Graphics.Nvdec.Vp9;
+using Ryujinx.Graphics.Video;
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using static Ryujinx.Graphics.Nvdec.MemoryExtensions;
+
+namespace Ryujinx.Graphics.Nvdec
+{
+    static class Vp9Decoder
+    {
+        private static Decoder _decoder = new Decoder();
+
+        public unsafe static void Decode(ResourceManager rm, ref NvdecRegisters state)
+        {
+            PictureInfo pictureInfo = rm.Gmm.DeviceRead<PictureInfo>(state.SetDrvPicSetupOffset);
+            EntropyProbs entropy = rm.Gmm.DeviceRead<EntropyProbs>(state.Vp9SetProbTabBufOffset);
+
+            ISurface Rent(uint lumaOffset, uint chromaOffset, FrameSize size)
+            {
+                return rm.Cache.Get(_decoder, lumaOffset, chromaOffset, size.Width, size.Height);
+            }
+
+            ISurface lastSurface    = Rent(state.SetPictureLumaOffset[0], state.SetPictureChromaOffset[0], pictureInfo.LastFrameSize);
+            ISurface goldenSurface  = Rent(state.SetPictureLumaOffset[1], state.SetPictureChromaOffset[1], pictureInfo.GoldenFrameSize);
+            ISurface altSurface     = Rent(state.SetPictureLumaOffset[2], state.SetPictureChromaOffset[2], pictureInfo.AltFrameSize);
+            ISurface currentSurface = Rent(state.SetPictureLumaOffset[3], state.SetPictureChromaOffset[3], pictureInfo.CurrentFrameSize);
+
+            Vp9PictureInfo info = pictureInfo.Convert();
+
+            info.LastReference = lastSurface;
+            info.GoldenReference = goldenSurface;
+            info.AltReference = altSurface;
+
+            entropy.Convert(ref info.Entropy);
+
+            ReadOnlySpan<byte> bitstream = rm.Gmm.DeviceGetSpan(state.SetInBufBaseOffset, (int)pictureInfo.BitstreamSize);
+
+            ReadOnlySpan<Vp9MvRef> mvsIn = ReadOnlySpan<Vp9MvRef>.Empty;
+
+            if (info.UsePrevInFindMvRefs)
+            {
+                mvsIn = GetMvsInput(rm.Gmm, pictureInfo.CurrentFrameSize, state.Vp9SetColMvReadBufOffset);
+            }
+
+            int miCols = BitUtils.DivRoundUp(pictureInfo.CurrentFrameSize.Width, 8);
+            int miRows = BitUtils.DivRoundUp(pictureInfo.CurrentFrameSize.Height, 8);
+
+            using var mvsRegion = rm.Gmm.GetWritableRegion(ExtendOffset(state.Vp9SetColMvWriteBufOffset), miRows * miCols * 16);
+
+            Span<Vp9MvRef> mvsOut = MemoryMarshal.Cast<byte, Vp9MvRef>(mvsRegion.Memory.Span);
+
+            uint lumaOffset   = state.SetPictureLumaOffset[3];
+            uint chromaOffset = state.SetPictureChromaOffset[3];
+
+            if (_decoder.Decode(ref info, currentSurface, bitstream, mvsIn, mvsOut))
+            {
+                SurfaceWriter.Write(rm.Gmm, currentSurface, lumaOffset, chromaOffset);
+            }
+
+            WriteBackwardUpdates(rm.Gmm, state.Vp9SetCtxCounterBufOffset, ref info.BackwardUpdateCounts);
+
+            rm.Cache.Put(lastSurface);
+            rm.Cache.Put(goldenSurface);
+            rm.Cache.Put(altSurface);
+            rm.Cache.Put(currentSurface);
+        }
+
+        private static ReadOnlySpan<Vp9MvRef> GetMvsInput(MemoryManager gmm, FrameSize size, uint offset)
+        {
+            int miCols = BitUtils.DivRoundUp(size.Width, 8);
+            int miRows = BitUtils.DivRoundUp(size.Height, 8);
+
+            return MemoryMarshal.Cast<byte, Vp9MvRef>(gmm.DeviceGetSpan(offset, miRows * miCols * 16));
+        }
+
+        private static void WriteBackwardUpdates(MemoryManager gmm, uint offset, ref Vp9BackwardUpdates counts)
+        {
+            using var backwardUpdatesRegion = gmm.GetWritableRegion(ExtendOffset(offset), Unsafe.SizeOf<BackwardUpdates>());
+
+            ref var backwardUpdates = ref MemoryMarshal.Cast<byte, BackwardUpdates>(backwardUpdatesRegion.Memory.Span)[0];
+
+            backwardUpdates = new BackwardUpdates(ref counts);
+        }
+    }
+}