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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 readonly Decoder _decoder = new();
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);
}
}
}
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