Salieri: shader cache (#1701)

Here come Salieri, my implementation of a disk shader cache!

"I'm sure you know why I named it that."
"It doesn't really mean anything."

This implementation collects shaders at runtime and cache them to be later compiled when starting a game.

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/CacheGraphicsApi.cs

@@ -0,0 +1,38 @@
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Graphics API type accepted by the shader cache.
+    /// </summary>
+    enum CacheGraphicsApi : byte
+    {
+        /// <summary>
+        /// OpenGL Core
+        /// </summary>
+        OpenGL,
+
+        /// <summary>
+        /// OpenGL ES
+        /// </summary>
+        OpenGLES,
+
+        /// <summary>
+        /// Vulkan
+        /// </summary>
+        Vulkan,
+
+        /// <summary>
+        /// DirectX
+        /// </summary>
+        DirectX,
+
+        /// <summary>
+        /// Metal
+        /// </summary>
+        Metal,
+
+        /// <summary>
+        /// Guest, used to cache games raw shader programs.
+        /// </summary>
+        Guest
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/CacheHashType.cs

@@ -0,0 +1,13 @@
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Hash algorithm accepted by the shader cache.
+    /// </summary>
+    enum CacheHashType : byte
+    {
+        /// <summary>
+        /// xxHash128
+        /// </summary>
+        XxHash128
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/CacheManifestHeader.cs

@@ -0,0 +1,97 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Header of the shader cache manifest.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 0x10)]
+    struct CacheManifestHeader
+    {
+        /// <summary>
+        /// The version of the cache.
+        /// </summary>
+        public ulong Version;
+
+        /// <summary>
+        /// The graphics api used for this cache.
+        /// </summary>
+        public CacheGraphicsApi GraphicsApi;
+
+        /// <summary>
+        /// The hash type used for this cache.
+        /// </summary>
+        public CacheHashType HashType;
+
+        /// <summary>
+        /// CRC-16 checksum over the data in the file.
+        /// </summary>
+        public ushort TableChecksum;
+
+        /// <summary>
+        /// Construct a new cache manifest header.
+        /// </summary>
+        /// <param name="version">The version of the cache</param>
+        /// <param name="graphicsApi">The graphics api used for this cache</param>
+        /// <param name="hashType">The hash type used for this cache</param>
+        public CacheManifestHeader(ulong version, CacheGraphicsApi graphicsApi, CacheHashType hashType)
+        {
+            Version = version;
+            GraphicsApi = graphicsApi;
+            HashType = hashType;
+            TableChecksum = 0;
+        }
+
+        /// <summary>
+        /// Update the checksum in the header.
+        /// </summary>
+        /// <param name="data">The data to perform the checksum on</param>
+        public void UpdateChecksum(ReadOnlySpan<byte> data)
+        {
+            TableChecksum = CalculateCrc16(data);
+        }
+
+        /// <summary>
+        /// Calculate a CRC-16 over data.
+        /// </summary>
+        /// <param name="data">The data to perform the CRC-16 on</param>
+        /// <returns>A CRC-16 over data</returns>
+        private static ushort CalculateCrc16(ReadOnlySpan<byte> data)
+        {
+            int crc = 0;
+
+            const ushort poly = 0x1021;
+
+            for (int i = 0; i < data.Length; i++)
+            {
+                crc ^= data[i] << 8;
+
+                for (int j = 0; j < 8; j++)
+                {
+                    crc <<= 1;
+
+                    if ((crc & 0x10000) != 0)
+                    {
+                        crc = (crc ^ poly) & 0xFFFF;
+                    }
+                }
+            }
+
+            return (ushort)crc;
+        }
+
+        /// <summary>
+        /// Check the validity of the header.
+        /// </summary>
+        /// <param name="version">The target version in use</param>
+        /// <param name="graphicsApi">The target graphics api in use</param>
+        /// <param name="hashType">The target hash type in use</param>
+        /// <param name="data">The data after this header</param>
+        /// <returns>True if the header is valid</returns>
+        public bool IsValid(ulong version, CacheGraphicsApi graphicsApi, CacheHashType hashType, ReadOnlySpan<byte> data)
+        {
+            return Version == version && GraphicsApi == graphicsApi && HashType == hashType && TableChecksum == CalculateCrc16(data);
+        }
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestGpuAccessorHeader.cs

@@ -0,0 +1,62 @@
+using Ryujinx.Graphics.Shader;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Header of a cached guest gpu accessor.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Size = 0x20, Pack = 1)]
+    struct GuestGpuAccessorHeader
+    {
+        /// <summary>
+        /// The count of texture descriptors.
+        /// </summary>
+        public int TextureDescriptorCount;
+
+        /// <summary>
+        /// Local Size X for compute shaders.
+        /// </summary>
+        public int ComputeLocalSizeX;
+
+        /// <summary>
+        /// Local Size Y for compute shaders.
+        /// </summary>
+        public int ComputeLocalSizeY;
+
+        /// <summary>
+        /// Local Size Z for compute shaders.
+        /// </summary>
+        public int ComputeLocalSizeZ;
+
+        /// <summary>
+        /// Local Memory size in bytes for compute shaders.
+        /// </summary>
+        public int ComputeLocalMemorySize;
+
+        /// <summary>
+        /// Shared Memory size in bytes for compute shaders.
+        /// </summary>
+        public int ComputeSharedMemorySize;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public int Reserved1;
+
+        /// <summary>
+        /// Current primitive topology for geometry shaders.
+        /// </summary>
+        public InputTopology PrimitiveTopology;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public ushort Reserved2;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public byte Reserved3;
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestShaderCacheEntry.cs

@@ -0,0 +1,88 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Represent a cached shader entry in a guest shader program.
+    /// </summary>
+    class GuestShaderCacheEntry
+    {
+        /// <summary>
+        /// The header of the cached shader entry.
+        /// </summary>
+        public GuestShaderCacheEntryHeader Header { get; }
+
+        /// <summary>
+        /// The code of this shader.
+        /// </summary>
+        /// <remarks>If a Vertex A is present, this also contains the code 2 section.</remarks>
+        public byte[] Code { get; }
+
+        /// <summary>
+        /// The textures descriptors used for this shader.
+        /// </summary>
+        public Dictionary<int, GuestTextureDescriptor> TextureDescriptors { get; }
+
+        /// <summary>
+        /// Create a new instance of <see cref="GuestShaderCacheEntry"/>.
+        /// </summary>
+        /// <param name="header">The header of the cached shader entry</param>
+        /// <param name="code">The code of this shader</param>
+        private GuestShaderCacheEntry(GuestShaderCacheEntryHeader header, byte[] code)
+        {
+            Header = header;
+            Code = code;
+            TextureDescriptors = new Dictionary<int, GuestTextureDescriptor>();
+        }
+
+        /// <summary>
+        /// Parse a raw cached user shader program into an array of shader cache entry.
+        /// </summary>
+        /// <param name="data">The raw cached user shader program</param>
+        /// <param name="fileHeader">The user shader program header</param>
+        /// <returns>An array of shader cache entry</returns>
+        public static GuestShaderCacheEntry[] Parse(ref ReadOnlySpan<byte> data, out GuestShaderCacheHeader fileHeader)
+        {
+            fileHeader = MemoryMarshal.Read<GuestShaderCacheHeader>(data);
+
+            data = data.Slice(Unsafe.SizeOf<GuestShaderCacheHeader>());
+
+            ReadOnlySpan<GuestShaderCacheEntryHeader> entryHeaders = MemoryMarshal.Cast<byte, GuestShaderCacheEntryHeader>(data.Slice(0, fileHeader.Count * Unsafe.SizeOf<GuestShaderCacheEntryHeader>()));
+
+            data = data.Slice(fileHeader.Count * Unsafe.SizeOf<GuestShaderCacheEntryHeader>());
+
+            GuestShaderCacheEntry[] result = new GuestShaderCacheEntry[fileHeader.Count];
+
+            for (int i = 0; i < result.Length; i++)
+            {
+                GuestShaderCacheEntryHeader header = entryHeaders[i];
+
+                // Ignore empty entries
+                if (header.Size == 0 && header.SizeA == 0)
+                {
+                    continue;
+                }
+
+                byte[] code = data.Slice(0, header.Size + header.SizeA).ToArray();
+
+                data = data.Slice(header.Size + header.SizeA);
+
+                result[i] = new GuestShaderCacheEntry(header, code);
+
+                ReadOnlySpan<GuestTextureDescriptor> textureDescriptors = MemoryMarshal.Cast<byte, GuestTextureDescriptor>(data.Slice(0, header.GpuAccessorHeader.TextureDescriptorCount * Unsafe.SizeOf<GuestTextureDescriptor>()));
+
+                foreach (GuestTextureDescriptor textureDescriptor in textureDescriptors)
+                {
+                    result[i].TextureDescriptors.Add((int)textureDescriptor.Handle, textureDescriptor);
+                }
+
+                data = data.Slice(header.GpuAccessorHeader.TextureDescriptorCount * Unsafe.SizeOf<GuestTextureDescriptor>());
+            }
+
+            return result;
+        }
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestShaderCacheEntryHeader.cs

@@ -0,0 +1,67 @@
+using Ryujinx.Graphics.Shader;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// The header of a guest shader entry in a guest shader program.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 0x1, Size = 0x30)]
+    struct GuestShaderCacheEntryHeader
+    {
+        /// <summary>
+        /// The stage of this shader.
+        /// </summary>
+        public ShaderStage Stage;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public byte Reserved1;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public byte Reserved2;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public byte Reserved3;
+
+        /// <summary>
+        /// The size of the code section.
+        /// </summary>
+        public int Size;
+
+        /// <summary>
+        /// The size of the code2 section if present. (Vertex A)
+        /// </summary>
+        public int SizeA;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public int Reserved4;
+
+        /// <summary>
+        /// The header of the cached gpu accessor.
+        /// </summary>
+        public GuestGpuAccessorHeader GpuAccessorHeader;
+
+        /// <summary>
+        /// Create a new guest shader entry header.
+        /// </summary>
+        /// <param name="stage">The stage of this shader</param>
+        /// <param name="size">The size of the code section</param>
+        /// <param name="sizeA">The size of the code2 section if present (Vertex A)</param>
+        /// <param name="gpuAccessorHeader">The header of the cached gpu accessor</param>
+        public GuestShaderCacheEntryHeader(ShaderStage stage, int size, int sizeA, GuestGpuAccessorHeader gpuAccessorHeader) : this()
+        {
+            Stage = stage;
+            Size  = size;
+            SizeA = sizeA;
+            GpuAccessorHeader = gpuAccessorHeader;
+        }
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestShaderCacheHeader.cs

@@ -0,0 +1,42 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// The header of a shader program in the guest cache.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 0x1, Size = 0x10)]
+    struct GuestShaderCacheHeader
+    {
+        /// <summary>
+        /// The count of shaders defining this program.
+        /// </summary>
+        public byte Count;
+
+        /// <summary>
+        /// The count of transform feedback data used in this program.
+        /// </summary>
+        public byte TransformFeedbackCount;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public ushort Reserved1;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public ulong Reserved2;
+
+        /// <summary>
+        /// Create a new guest shader cache header.
+        /// </summary>
+        /// <param name="count">The count of shaders defining this program</param>
+        /// <param name="transformFeedbackCount">The count of transform feedback data used in this program</param>
+        public GuestShaderCacheHeader(byte count, byte transformFeedbackCount) : this()
+        {
+            Count = count;
+            TransformFeedbackCount = transformFeedbackCount;
+        }
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestShaderCacheTransformFeedbackHeader.cs

@@ -0,0 +1,38 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Header for transform feedback.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 0x10)]
+    struct GuestShaderCacheTransformFeedbackHeader
+    {
+        /// <summary>
+        /// The buffer index of the transform feedback.
+        /// </summary>
+        public int BufferIndex;
+
+        /// <summary>
+        /// The stride of the transform feedback.
+        /// </summary>
+        public int Stride;
+
+        /// <summary>
+        /// The length of the varying location buffer of the transform feedback.
+        /// </summary>
+        public int VaryingLocationsLength;
+
+        /// <summary>
+        /// Reserved/unused.
+        /// </summary>
+        public int Reserved1;
+
+        public GuestShaderCacheTransformFeedbackHeader(int bufferIndex, int stride, int varyingLocationsLength) : this()
+        {
+            BufferIndex = bufferIndex;
+            Stride = stride;
+            VaryingLocationsLength = varyingLocationsLength;
+        }
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/GuestTextureDescriptor.cs

@@ -0,0 +1,15 @@
+using Ryujinx.Graphics.Gpu.Image;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Mostly identical to TextureDescriptor from <see cref="Image"/> but we don't store the address of the texture and store its handle instead.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Size = 0x20, Pack = 1)]
+    struct GuestTextureDescriptor
+    {
+        public uint Handle;
+        internal TextureDescriptor Descriptor;
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/HostShaderCacheEntry.cs

@@ -0,0 +1,210 @@
+using Ryujinx.Common;
+using Ryujinx.Graphics.Shader;
+using System;
+using System.IO;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Host shader entry used for binding information.
+    /// </summary>
+    class HostShaderCacheEntry
+    {
+        /// <summary>
+        /// The header of the cached shader entry.
+        /// </summary>
+        public HostShaderCacheEntryHeader Header { get; }
+
+        /// <summary>
+        /// Cached constant buffers.
+        /// </summary>
+        public BufferDescriptor[] CBuffers { get; }
+
+        /// <summary>
+        /// Cached storage buffers.
+        /// </summary>
+        public BufferDescriptor[] SBuffers { get; }
+
+        /// <summary>
+        /// Cached texture descriptors.
+        /// </summary>
+        public TextureDescriptor[] Textures { get; }
+
+        /// <summary>
+        /// Cached image descriptors.
+        /// </summary>
+        public TextureDescriptor[] Images { get; }
+
+        /// <summary>
+        /// Create a new instance of <see cref="HostShaderCacheEntry"/>.
+        /// </summary>
+        /// <param name="header">The header of the cached shader entry</param>
+        /// <param name="cBuffers">Cached constant buffers</param>
+        /// <param name="sBuffers">Cached storage buffers</param>
+        /// <param name="textures">Cached texture descriptors</param>
+        /// <param name="images">Cached image descriptors</param>
+        private HostShaderCacheEntry(
+            HostShaderCacheEntryHeader header,
+            BufferDescriptor[] cBuffers,
+            BufferDescriptor[] sBuffers,
+            TextureDescriptor[] textures,
+            TextureDescriptor[] images)
+        {
+            Header = header;
+            CBuffers = cBuffers;
+            SBuffers = sBuffers;
+            Textures = textures;
+            Images = images;
+        }
+
+        private HostShaderCacheEntry()
+        {
+            Header = new HostShaderCacheEntryHeader();
+            CBuffers = new BufferDescriptor[0];
+            SBuffers = new BufferDescriptor[0];
+            Textures = new TextureDescriptor[0];
+            Images = new TextureDescriptor[0];
+        }
+
+        private HostShaderCacheEntry(ShaderProgramInfo programInfo)
+        {
+            Header = new HostShaderCacheEntryHeader(programInfo.CBuffers.Count,
+                                                    programInfo.SBuffers.Count,
+                                                    programInfo.Textures.Count,
+                                                    programInfo.Images.Count,
+                                                    programInfo.UsesInstanceId);
+            CBuffers = programInfo.CBuffers.ToArray();
+            SBuffers = programInfo.SBuffers.ToArray();
+            Textures = programInfo.Textures.ToArray();
+            Images = programInfo.Images.ToArray();
+        }
+
+        /// <summary>
+        /// Convert the host shader entry to a <see cref="ShaderProgramInfo"/>.
+        /// </summary>
+        /// <returns>A new <see cref="ShaderProgramInfo"/> from this instance</returns>
+        internal ShaderProgramInfo ToShaderProgramInfo()
+        {
+            return new ShaderProgramInfo(CBuffers, SBuffers, Textures, Images, Header.UsesInstanceId);
+        }
+
+        /// <summary>
+        /// Parse a raw cached user shader program into an array of shader cache entry.
+        /// </summary>
+        /// <param name="data">The raw cached host shader</param>
+        /// <param name="programCode">The host shader program</param>
+        /// <returns>An array of shader cache entry</returns>
+        internal static HostShaderCacheEntry[] Parse(ReadOnlySpan<byte> data, out ReadOnlySpan<byte> programCode)
+        {
+            HostShaderCacheHeader fileHeader = MemoryMarshal.Read<HostShaderCacheHeader>(data);
+
+            data = data.Slice(Unsafe.SizeOf<HostShaderCacheHeader>());
+
+            ReadOnlySpan<HostShaderCacheEntryHeader> entryHeaders = MemoryMarshal.Cast<byte, HostShaderCacheEntryHeader>(data.Slice(0, fileHeader.Count * Unsafe.SizeOf<HostShaderCacheEntryHeader>()));
+
+            data = data.Slice(fileHeader.Count * Unsafe.SizeOf<HostShaderCacheEntryHeader>());
+
+            HostShaderCacheEntry[] result = new HostShaderCacheEntry[fileHeader.Count];
+
+            for (int i = 0; i < result.Length; i++)
+            {
+                HostShaderCacheEntryHeader header = entryHeaders[i];
+
+                if (!header.InUse)
+                {
+                    continue;
+                }
+
+                int cBufferDescriptorsSize = header.CBuffersCount * Unsafe.SizeOf<BufferDescriptor>();
+                int sBufferDescriptorsSize = header.SBuffersCount * Unsafe.SizeOf<BufferDescriptor>();
+                int textureDescriptorsSize = header.TexturesCount * Unsafe.SizeOf<TextureDescriptor>();
+                int imageDescriptorsSize   = header.ImagesCount * Unsafe.SizeOf<TextureDescriptor>();
+
+                ReadOnlySpan<BufferDescriptor> cBuffers = MemoryMarshal.Cast<byte, BufferDescriptor>(data.Slice(0, cBufferDescriptorsSize));
+                data = data.Slice(cBufferDescriptorsSize);
+
+                ReadOnlySpan<BufferDescriptor> sBuffers = MemoryMarshal.Cast<byte, BufferDescriptor>(data.Slice(0, sBufferDescriptorsSize));
+                data = data.Slice(sBufferDescriptorsSize);
+
+                ReadOnlySpan<TextureDescriptor> textureDescriptors = MemoryMarshal.Cast<byte, TextureDescriptor>(data.Slice(0, textureDescriptorsSize));
+                data = data.Slice(textureDescriptorsSize);
+
+                ReadOnlySpan<TextureDescriptor> imageDescriptors = MemoryMarshal.Cast<byte, TextureDescriptor>(data.Slice(0, imageDescriptorsSize));
+                data = data.Slice(imageDescriptorsSize);
+
+                result[i] = new HostShaderCacheEntry(header, cBuffers.ToArray(), sBuffers.ToArray(), textureDescriptors.ToArray(), imageDescriptors.ToArray());
+            }
+
+            programCode = data.Slice(0, fileHeader.CodeSize);
+
+            return result;
+        }
+
+        /// <summary>
+        /// Create a new host shader cache file.
+        /// </summary>
+        /// <param name="programCode">The host shader program</param>
+        /// <param name="codeHolders">The shaders code holder</param>
+        /// <returns>Raw data of a new host shader cache file</returns>
+        internal static byte[] Create(ReadOnlySpan<byte> programCode, ShaderCodeHolder[] codeHolders)
+        {
+            HostShaderCacheHeader header = new HostShaderCacheHeader((byte)codeHolders.Length, programCode.Length);
+
+            HostShaderCacheEntry[] entries = new HostShaderCacheEntry[codeHolders.Length];
+
+            for (int i = 0; i < codeHolders.Length; i++)
+            {
+                if (codeHolders[i] == null)
+                {
+                    entries[i] = new HostShaderCacheEntry();
+                }
+                else
+                {
+                    entries[i] = new HostShaderCacheEntry(codeHolders[i].Info);
+                }
+            }
+
+            using (MemoryStream stream = new MemoryStream())
+            {
+                BinaryWriter writer = new BinaryWriter(stream);
+
+                writer.WriteStruct(header);
+
+                foreach (HostShaderCacheEntry entry in entries)
+                {
+                    writer.WriteStruct(entry.Header);
+                }
+
+                foreach (HostShaderCacheEntry entry in entries)
+                {
+                    foreach (BufferDescriptor cBuffer in entry.CBuffers)
+                    {
+                        writer.WriteStruct(cBuffer);
+                    }
+
+                    foreach (BufferDescriptor sBuffer in entry.SBuffers)
+                    {
+                        writer.WriteStruct(sBuffer);
+                    }
+
+                    foreach (TextureDescriptor texture in entry.Textures)
+                    {
+                        writer.WriteStruct(texture);
+                    }
+
+                    foreach (TextureDescriptor image in entry.Images)
+                    {
+                        writer.WriteStruct(image);
+                    }
+                }
+
+                writer.Write(programCode);
+
+                return stream.ToArray();
+            }
+        }
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/HostShaderCacheEntryHeader.cs

@@ -0,0 +1,67 @@
+using System.Runtime.InteropServices;
+using Ryujinx.Graphics.Shader;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// Host shader entry header used for binding information.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 1, Size = 0x14)]
+    struct HostShaderCacheEntryHeader
+    {
+        /// <summary>
+        /// Count of constant buffer descriptors.
+        /// </summary>
+        public int CBuffersCount;
+
+        /// <summary>
+        /// Count of storage buffer descriptors.
+        /// </summary>
+        public int SBuffersCount;
+
+        /// <summary>
+        /// Count of texture descriptors.
+        /// </summary>
+        public int TexturesCount;
+
+        /// <summary>
+        /// Count of image descriptors.
+        /// </summary>
+        public int ImagesCount;
+
+        /// <summary>
+        /// Set to true if the shader uses instance id.
+        /// </summary>
+        [MarshalAs(UnmanagedType.I1)]
+        public bool UsesInstanceId;
+
+        /// <summary>
+        /// Set to true if this entry is in use.
+        /// </summary>
+        [MarshalAs(UnmanagedType.I1)]
+        public bool InUse;
+
+        /// <summary>
+        /// Reserved / unused.
+        /// </summary>
+        public short Reserved;
+
+        /// <summary>
+        /// Create a new host shader cache entry header.
+        /// </summary>
+        /// <param name="cBuffersCount">Count of constant buffer descriptors</param>
+        /// <param name="sBuffersCount">Count of storage buffer descriptors</param>
+        /// <param name="texturesCount">Count of texture descriptors</param>
+        /// <param name="imagesCount">Count of image descriptors</param>
+        /// <param name="usesInstanceId">Set to true if the shader uses instance id</param>
+        public HostShaderCacheEntryHeader(int cBuffersCount, int sBuffersCount, int texturesCount, int imagesCount, bool usesInstanceId) : this()
+        {
+            CBuffersCount  = cBuffersCount;
+            SBuffersCount  = sBuffersCount;
+            TexturesCount  = texturesCount;
+            ImagesCount    = imagesCount;
+            UsesInstanceId = usesInstanceId;
+            InUse          = true;
+        }
+    }
+}

Ryujinx.Graphics.Gpu/Shader/Cache/Definition/HostShaderCacheHeader.cs

@@ -0,0 +1,42 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Shader.Cache.Definition
+{
+    /// <summary>
+    /// The header of a shader program in the guest cache.
+    /// </summary>
+    [StructLayout(LayoutKind.Sequential, Pack = 0x1, Size = 0x10)]
+    struct HostShaderCacheHeader
+    {
+        /// <summary>
+        /// The count of shaders defining this program.
+        /// </summary>
+        public byte Count;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public byte Reserved1;
+
+        /// <summary>
+        /// Unused/reserved.
+        /// </summary>
+        public ushort Reserved2;
+
+        /// <summary>
+        /// Size of the shader binary.
+        /// </summary>
+        public int CodeSize;
+
+        /// <summary>
+        /// Create a new host shader cache header.
+        /// </summary>
+        /// <param name="count">The count of shaders defining this program</param>
+        /// <param name="codeSize">The size of the shader binary</param>
+        public HostShaderCacheHeader(byte count, int codeSize) : this()
+        {
+            Count    = count;
+            CodeSize = codeSize;
+        }
+    }
+}