Geometry shader emulation for macOS (#5551)

* Implement vertex and geometry shader conversion to compute

* Call InitializeReservedCounts for compute too

* PR feedback

* Set clip distance mask for geometry and tessellation shaders too

* Transform feedback emulation only for vertex

4 files changed, 1420 insertions, 0 deletions

diff --git a/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VertexInfoBufferUpdater.cs b/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VertexInfoBufferUpdater.cs
new file mode 100644
index 00000000..65f556fc
--- /dev/null
+++ b/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VertexInfoBufferUpdater.cs
@@ -0,0 +1,141 @@
+using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Gpu.Memory;
+using Ryujinx.Graphics.Shader;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Engine.Threed.ComputeDraw
+{
+    /// <summary>
+    /// Vertex info buffer data updater.
+    /// </summary>
+    class VertexInfoBufferUpdater : BufferUpdater
+    {
+        private VertexInfoBuffer _data;
+
+        /// <summary>
+        /// Creates a new instance of the vertex info buffer updater.
+        /// </summary>
+        /// <param name="renderer">Renderer that the vertex info buffer will be used with</param>
+        public VertexInfoBufferUpdater(IRenderer renderer) : base(renderer)
+        {
+        }
+
+        /// <summary>
+        /// Sets vertex data related counts.
+        /// </summary>
+        /// <param name="vertexCount">Number of vertices used on the draw</param>
+        /// <param name="instanceCount">Number of draw instances</param>
+        /// <param name="firstVertex">Index of the first vertex on the vertex buffer</param>
+        /// <param name="firstInstance">Index of the first instanced vertex on the vertex buffer</param>
+        public void SetVertexCounts(int vertexCount, int instanceCount, int firstVertex, int firstInstance)
+        {
+            if (_data.VertexCounts.X != vertexCount)
+            {
+                _data.VertexCounts.X = vertexCount;
+                MarkDirty(VertexInfoBuffer.VertexCountsOffset, sizeof(int));
+            }
+
+            if (_data.VertexCounts.Y != instanceCount)
+            {
+                _data.VertexCounts.Y = instanceCount;
+                MarkDirty(VertexInfoBuffer.VertexCountsOffset + sizeof(int), sizeof(int));
+            }
+
+            if (_data.VertexCounts.Z != firstVertex)
+            {
+                _data.VertexCounts.Z = firstVertex;
+                MarkDirty(VertexInfoBuffer.VertexCountsOffset + sizeof(int) * 2, sizeof(int));
+            }
+
+            if (_data.VertexCounts.W != firstInstance)
+            {
+                _data.VertexCounts.W = firstInstance;
+                MarkDirty(VertexInfoBuffer.VertexCountsOffset + sizeof(int) * 3, sizeof(int));
+            }
+        }
+
+        /// <summary>
+        /// Sets vertex data related counts.
+        /// </summary>
+        /// <param name="primitivesCount">Number of primitives consumed by the geometry shader</param>
+        public void SetGeometryCounts(int primitivesCount)
+        {
+            if (_data.GeometryCounts.X != primitivesCount)
+            {
+                _data.GeometryCounts.X = primitivesCount;
+                MarkDirty(VertexInfoBuffer.GeometryCountsOffset, sizeof(int));
+            }
+        }
+
+        /// <summary>
+        /// Sets a vertex stride and related data.
+        /// </summary>
+        /// <param name="index">Index of the vertex stride to be updated</param>
+        /// <param name="stride">Stride divided by the component or format size</param>
+        /// <param name="componentCount">Number of components that the format has</param>
+        public void SetVertexStride(int index, int stride, int componentCount)
+        {
+            if (_data.VertexStrides[index].X != stride)
+            {
+                _data.VertexStrides[index].X = stride;
+                MarkDirty(VertexInfoBuffer.VertexStridesOffset + index * Unsafe.SizeOf<Vector4<int>>(), sizeof(int));
+            }
+
+            for (int c = 1; c < 4; c++)
+            {
+                int value = c < componentCount ? 1 : 0;
+
+                ref int currentValue = ref GetElementRef(ref _data.VertexStrides[index], c);
+
+                if (currentValue != value)
+                {
+                    currentValue = value;
+                    MarkDirty(VertexInfoBuffer.VertexStridesOffset + index * Unsafe.SizeOf<Vector4<int>>() + c * sizeof(int), sizeof(int));
+                }
+            }
+        }
+
+        /// <summary>
+        /// Sets a vertex offset and related data.
+        /// </summary>
+        /// <param name="index">Index of the vertex offset to be updated</param>
+        /// <param name="offset">Offset divided by the component or format size</param>
+        /// <param name="divisor">If the draw is instanced, should have the vertex divisor value, otherwise should be zero</param>
+        public void SetVertexOffset(int index, int offset, int divisor)
+        {
+            if (_data.VertexOffsets[index].X != offset)
+            {
+                _data.VertexOffsets[index].X = offset;
+                MarkDirty(VertexInfoBuffer.VertexOffsetsOffset + index * Unsafe.SizeOf<Vector4<int>>(), sizeof(int));
+            }
+
+            if (_data.VertexOffsets[index].Y != divisor)
+            {
+                _data.VertexOffsets[index].Y = divisor;
+                MarkDirty(VertexInfoBuffer.VertexOffsetsOffset + index * Unsafe.SizeOf<Vector4<int>>() + sizeof(int), sizeof(int));
+            }
+        }
+
+        /// <summary>
+        /// Sets the offset of the index buffer.
+        /// </summary>
+        /// <param name="offset">Offset divided by the component size</param>
+        public void SetIndexBufferOffset(int offset)
+        {
+            if (_data.GeometryCounts.W != offset)
+            {
+                _data.GeometryCounts.W = offset;
+                MarkDirty(VertexInfoBuffer.GeometryCountsOffset + sizeof(int) * 3, sizeof(int));
+            }
+        }
+
+        /// <summary>
+        /// Submits all pending buffer updates to the GPU.
+        /// </summary>
+        public void Commit()
+        {
+            Commit(MemoryMarshal.Cast<VertexInfoBuffer, byte>(MemoryMarshal.CreateSpan(ref _data, 1)));
+        }
+    }
+}
diff --git a/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsCompute.cs b/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsCompute.cs
new file mode 100644
index 00000000..cbbfd251
--- /dev/null
+++ b/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsCompute.cs
@@ -0,0 +1,96 @@
+using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Gpu.Shader;
+using System;
+
+namespace Ryujinx.Graphics.Gpu.Engine.Threed.ComputeDraw
+{
+    /// <summary>
+    /// Vertex, tessellation and geometry as compute shader draw manager.
+    /// </summary>
+    class VtgAsCompute : IDisposable
+    {
+        private readonly GpuContext _context;
+        private readonly GpuChannel _channel;
+        private readonly DeviceStateWithShadow<ThreedClassState> _state;
+        private readonly VtgAsComputeContext _vacContext;
+
+        /// <summary>
+        /// Creates a new instance of the vertex, tessellation and geometry as compute shader draw manager.
+        /// </summary>
+        /// <param name="context">GPU context</param>
+        /// <param name="channel">GPU channel</param>
+        /// <param name="state">3D engine state</param>
+        public VtgAsCompute(GpuContext context, GpuChannel channel, DeviceStateWithShadow<ThreedClassState> state)
+        {
+            _context = context;
+            _channel = channel;
+            _state = state;
+            _vacContext = new(context);
+        }
+
+        /// <summary>
+        /// Emulates the pre-rasterization stages of a draw operation using a compute shader.
+        /// </summary>
+        /// <param name="engine">3D engine</param>
+        /// <param name="vertexAsCompute">Vertex shader converted to compute</param>
+        /// <param name="geometryAsCompute">Optional geometry shader converted to compute</param>
+        /// <param name="vertexPassthroughProgram">Fragment shader with a vertex passthrough shader to feed the compute output into the fragment stage</param>
+        /// <param name="topology">Primitive topology of the draw</param>
+        /// <param name="count">Index or vertex count of the draw</param>
+        /// <param name="instanceCount">Instance count</param>
+        /// <param name="firstIndex">First index on the index buffer, for indexed draws</param>
+        /// <param name="firstVertex">First vertex on the vertex buffer</param>
+        /// <param name="firstInstance">First instance</param>
+        /// <param name="indexed">Whether the draw is indexed</param>
+        public void DrawAsCompute(
+            ThreedClass engine,
+            ShaderAsCompute vertexAsCompute,
+            ShaderAsCompute geometryAsCompute,
+            IProgram vertexPassthroughProgram,
+            PrimitiveTopology topology,
+            int count,
+            int instanceCount,
+            int firstIndex,
+            int firstVertex,
+            int firstInstance,
+            bool indexed)
+        {
+            VtgAsComputeState state = new(
+                _context,
+                _channel,
+                _state,
+                _vacContext,
+                engine,
+                vertexAsCompute,
+                geometryAsCompute,
+                vertexPassthroughProgram,
+                topology,
+                count,
+                instanceCount,
+                firstIndex,
+                firstVertex,
+                firstInstance,
+                indexed);
+
+            state.RunVertex();
+            state.RunGeometry();
+            state.RunFragment();
+
+            _vacContext.FreeBuffers();
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _vacContext.Dispose();
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+    }
+}
diff --git a/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsComputeContext.cs b/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsComputeContext.cs
new file mode 100644
index 00000000..e9b754ff
--- /dev/null
+++ b/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsComputeContext.cs
@@ -0,0 +1,648 @@
+using Ryujinx.Common;
+using Ryujinx.Graphics.GAL;
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.Gpu.Engine.Threed.ComputeDraw
+{
+    /// <summary>
+    /// Vertex, tessellation and geometry as compute shader context.
+    /// </summary>
+    class VtgAsComputeContext : IDisposable
+    {
+        private const int DummyBufferSize = 16;
+
+        private readonly GpuContext _context;
+
+        /// <summary>
+        /// Cache of buffer textures used for vertex and index buffers.
+        /// </summary>
+        private class BufferTextureCache : IDisposable
+        {
+            private readonly Dictionary<Format, ITexture> _cache;
+
+            /// <summary>
+            /// Creates a new instance of the buffer texture cache.
+            /// </summary>
+            public BufferTextureCache()
+            {
+                _cache = new();
+            }
+
+            /// <summary>
+            /// Gets a cached or creates and caches a buffer texture with the specified format.
+            /// </summary>
+            /// <param name="renderer">Renderer where the texture will be used</param>
+            /// <param name="format">Format of the buffer texture</param>
+            /// <returns>Buffer texture</returns>
+            public ITexture Get(IRenderer renderer, Format format)
+            {
+                if (!_cache.TryGetValue(format, out ITexture bufferTexture))
+                {
+                    bufferTexture = renderer.CreateTexture(new TextureCreateInfo(
+                        1,
+                        1,
+                        1,
+                        1,
+                        1,
+                        1,
+                        1,
+                        1,
+                        format,
+                        DepthStencilMode.Depth,
+                        Target.TextureBuffer,
+                        SwizzleComponent.Red,
+                        SwizzleComponent.Green,
+                        SwizzleComponent.Blue,
+                        SwizzleComponent.Alpha));
+
+                    _cache.Add(format, bufferTexture);
+                }
+
+                return bufferTexture;
+            }
+
+            protected virtual void Dispose(bool disposing)
+            {
+                if (disposing)
+                {
+                    foreach (var texture in _cache.Values)
+                    {
+                        texture.Release();
+                    }
+
+                    _cache.Clear();
+                }
+            }
+
+            public void Dispose()
+            {
+                Dispose(true);
+                GC.SuppressFinalize(this);
+            }
+        }
+
+        /// <summary>
+        /// Buffer state.
+        /// </summary>
+        private struct Buffer
+        {
+            /// <summary>
+            /// Buffer handle.
+            /// </summary>
+            public BufferHandle Handle;
+
+            /// <summary>
+            /// Current free buffer offset.
+            /// </summary>
+            public int Offset;
+
+            /// <summary>
+            /// Total buffer size in bytes.
+            /// </summary>
+            public int Size;
+        }
+
+        /// <summary>
+        /// Index buffer state.
+        /// </summary>
+        private readonly struct IndexBuffer
+        {
+            /// <summary>
+            /// Buffer handle.
+            /// </summary>
+            public BufferHandle Handle { get; }
+
+            /// <summary>
+            /// Index count.
+            /// </summary>
+            public int Count { get; }
+
+            /// <summary>
+            /// Size in bytes.
+            /// </summary>
+            public int Size { get; }
+
+            /// <summary>
+            /// Creates a new index buffer state.
+            /// </summary>
+            /// <param name="handle">Buffer handle</param>
+            /// <param name="count">Index count</param>
+            /// <param name="size">Size in bytes</param>
+            public IndexBuffer(BufferHandle handle, int count, int size)
+            {
+                Handle = handle;
+                Count = count;
+                Size = size;
+            }
+
+            /// <summary>
+            /// Creates a full range starting from the beggining of the buffer.
+            /// </summary>
+            /// <returns>Range</returns>
+            public readonly BufferRange ToRange()
+            {
+                return new BufferRange(Handle, 0, Size);
+            }
+
+            /// <summary>
+            /// Creates a range starting from the beggining of the buffer, with the specified size.
+            /// </summary>
+            /// <param name="size">Size in bytes of the range</param>
+            /// <returns>Range</returns>
+            public readonly BufferRange ToRange(int size)
+            {
+                return new BufferRange(Handle, 0, size);
+            }
+        }
+
+        private readonly BufferTextureCache[] _bufferTextures;
+        private BufferHandle _dummyBuffer;
+        private Buffer _vertexDataBuffer;
+        private Buffer _geometryVertexDataBuffer;
+        private Buffer _geometryIndexDataBuffer;
+        private BufferHandle _sequentialIndexBuffer;
+        private int _sequentialIndexBufferCount;
+
+        private readonly Dictionary<PrimitiveTopology, IndexBuffer> _topologyRemapBuffers;
+
+        /// <summary>
+        /// Vertex information buffer updater.
+        /// </summary>
+        public VertexInfoBufferUpdater VertexInfoBufferUpdater { get; }
+
+        /// <summary>
+        /// Creates a new instance of the vertex, tessellation and geometry as compute shader context.
+        /// </summary>
+        /// <param name="context"></param>
+        public VtgAsComputeContext(GpuContext context)
+        {
+            _context = context;
+            _bufferTextures = new BufferTextureCache[Constants.TotalVertexBuffers + 2];
+            _topologyRemapBuffers = new();
+            VertexInfoBufferUpdater = new(context.Renderer);
+        }
+
+        /// <summary>
+        /// Gets the number of complete primitives that can be formed with a given vertex count, for a given topology.
+        /// </summary>
+        /// <param name="primitiveType">Topology</param>
+        /// <param name="count">Vertex count</param>
+        /// <returns>Total of complete primitives</returns>
+        public static int GetPrimitivesCount(PrimitiveTopology primitiveType, int count)
+        {
+            return primitiveType switch
+            {
+                PrimitiveTopology.Lines => count / 2,
+                PrimitiveTopology.LinesAdjacency => count / 4,
+                PrimitiveTopology.LineLoop => count > 1 ? count : 0,
+                PrimitiveTopology.LineStrip => Math.Max(count - 1, 0),
+                PrimitiveTopology.LineStripAdjacency => Math.Max(count - 3, 0),
+                PrimitiveTopology.Triangles => count / 3,
+                PrimitiveTopology.TrianglesAdjacency => count / 6,
+                PrimitiveTopology.TriangleStrip or
+                PrimitiveTopology.TriangleFan or
+                PrimitiveTopology.Polygon => Math.Max(count - 2, 0),
+                PrimitiveTopology.TriangleStripAdjacency => Math.Max(count - 2, 0) / 2,
+                PrimitiveTopology.Quads => (count / 4) * 2, // In triangles.
+                PrimitiveTopology.QuadStrip => Math.Max((count - 2) / 2, 0) * 2, // In triangles.
+                _ => count,
+            };
+        }
+
+        /// <summary>
+        /// Gets the total of vertices that a single primitive has, for the specified topology.
+        /// </summary>
+        /// <param name="primitiveType">Topology</param>
+        /// <returns>Vertex count</returns>
+        private static int GetVerticesPerPrimitive(PrimitiveTopology primitiveType)
+        {
+            return primitiveType switch
+            {
+                PrimitiveTopology.Lines or
+                PrimitiveTopology.LineLoop or
+                PrimitiveTopology.LineStrip => 2,
+                PrimitiveTopology.LinesAdjacency or
+                PrimitiveTopology.LineStripAdjacency => 4,
+                PrimitiveTopology.Triangles or
+                PrimitiveTopology.TriangleStrip or
+                PrimitiveTopology.TriangleFan or
+                PrimitiveTopology.Polygon => 3,
+                PrimitiveTopology.TrianglesAdjacency or
+                PrimitiveTopology.TriangleStripAdjacency => 6,
+                PrimitiveTopology.Quads or
+                PrimitiveTopology.QuadStrip => 3, // 2 triangles.
+                _ => 1,
+            };
+        }
+
+        /// <summary>
+        /// Gets a cached or creates a new buffer that can be used to map linear indices to ones
+        /// of a specified topology, and build complete primitives.
+        /// </summary>
+        /// <param name="topology">Topology</param>
+        /// <param name="count">Number of input vertices that needs to be mapped using that buffer</param>
+        /// <returns>Remap buffer range</returns>
+        public BufferRange GetOrCreateTopologyRemapBuffer(PrimitiveTopology topology, int count)
+        {
+            if (!_topologyRemapBuffers.TryGetValue(topology, out IndexBuffer buffer) || buffer.Count < count)
+            {
+                if (buffer.Handle != BufferHandle.Null)
+                {
+                    _context.Renderer.DeleteBuffer(buffer.Handle);
+                }
+
+                buffer = CreateTopologyRemapBuffer(topology, count);
+                _topologyRemapBuffers[topology] = buffer;
+
+                return buffer.ToRange();
+            }
+
+            return buffer.ToRange(Math.Max(GetPrimitivesCount(topology, count) * GetVerticesPerPrimitive(topology), 1) * sizeof(uint));
+        }
+
+        /// <summary>
+        /// Creates a new topology remap buffer.
+        /// </summary>
+        /// <param name="topology">Topology</param>
+        /// <param name="count">Maximum of vertices that will be accessed</param>
+        /// <returns>Remap buffer range</returns>
+        private IndexBuffer CreateTopologyRemapBuffer(PrimitiveTopology topology, int count)
+        {
+            // Size can't be zero as creating zero sized buffers is invalid.
+            Span<int> data = new int[Math.Max(GetPrimitivesCount(topology, count) * GetVerticesPerPrimitive(topology), 1)];
+
+            switch (topology)
+            {
+                case PrimitiveTopology.Points:
+                case PrimitiveTopology.Lines:
+                case PrimitiveTopology.LinesAdjacency:
+                case PrimitiveTopology.Triangles:
+                case PrimitiveTopology.TrianglesAdjacency:
+                case PrimitiveTopology.Patches:
+                    for (int index = 0; index < data.Length; index++)
+                    {
+                        data[index] = index;
+                    }
+                    break;
+                case PrimitiveTopology.LineLoop:
+                    data[^1] = 0;
+
+                    for (int index = 0; index < ((data.Length - 1) & ~1); index += 2)
+                    {
+                        data[index] = index >> 1;
+                        data[index + 1] = (index >> 1) + 1;
+                    }
+                    break;
+                case PrimitiveTopology.LineStrip:
+                    for (int index = 0; index < ((data.Length - 1) & ~1); index += 2)
+                    {
+                        data[index] = index >> 1;
+                        data[index + 1] = (index >> 1) + 1;
+                    }
+                    break;
+                case PrimitiveTopology.TriangleStrip:
+                    int tsTrianglesCount = data.Length / 3;
+                    int tsOutIndex = 3;
+
+                    if (tsTrianglesCount > 0)
+                    {
+                        data[0] = 0;
+                        data[1] = 1;
+                        data[2] = 2;
+                    }
+
+                    for (int tri = 1; tri < tsTrianglesCount; tri++)
+                    {
+                        int baseIndex = tri * 3;
+
+                        if ((tri & 1) != 0)
+                        {
+                            data[baseIndex] = tsOutIndex - 1;
+                            data[baseIndex + 1] = tsOutIndex - 2;
+                            data[baseIndex + 2] = tsOutIndex++;
+                        }
+                        else
+                        {
+                            data[baseIndex] = tsOutIndex - 2;
+                            data[baseIndex + 1] = tsOutIndex - 1;
+                            data[baseIndex + 2] = tsOutIndex++;
+                        }
+                    }
+                    break;
+                case PrimitiveTopology.TriangleFan:
+                case PrimitiveTopology.Polygon:
+                    int tfTrianglesCount = data.Length / 3;
+                    int tfOutIndex = 1;
+
+                    for (int index = 0; index < tfTrianglesCount * 3; index += 3)
+                    {
+                        data[index] = 0;
+                        data[index + 1] = tfOutIndex;
+                        data[index + 2] = ++tfOutIndex;
+                    }
+                    break;
+                case PrimitiveTopology.Quads:
+                    int qQuadsCount = data.Length / 6;
+
+                    for (int quad = 0; quad < qQuadsCount; quad++)
+                    {
+                        int index = quad * 6;
+                        int qIndex = quad * 4;
+
+                        data[index] = qIndex;
+                        data[index + 1] = qIndex + 1;
+                        data[index + 2] = qIndex + 2;
+                        data[index + 3] = qIndex;
+                        data[index + 4] = qIndex + 2;
+                        data[index + 5] = qIndex + 3;
+                    }
+                    break;
+                case PrimitiveTopology.QuadStrip:
+                    int qsQuadsCount = data.Length / 6;
+
+                    if (qsQuadsCount > 0)
+                    {
+                        data[0] = 0;
+                        data[1] = 1;
+                        data[2] = 2;
+                        data[3] = 0;
+                        data[4] = 2;
+                        data[5] = 3;
+                    }
+
+                    for (int quad = 1; quad < qsQuadsCount; quad++)
+                    {
+                        int index = quad * 6;
+                        int qIndex = quad * 2;
+
+                        data[index] = qIndex + 1;
+                        data[index + 1] = qIndex;
+                        data[index + 2] = qIndex + 2;
+                        data[index + 3] = qIndex + 1;
+                        data[index + 4] = qIndex + 2;
+                        data[index + 5] = qIndex + 3;
+                    }
+                    break;
+                case PrimitiveTopology.LineStripAdjacency:
+                    for (int index = 0; index < ((data.Length - 3) & ~3); index += 4)
+                    {
+                        int lIndex = index >> 2;
+
+                        data[index] = lIndex;
+                        data[index + 1] = lIndex + 1;
+                        data[index + 2] = lIndex + 2;
+                        data[index + 3] = lIndex + 3;
+                    }
+                    break;
+                case PrimitiveTopology.TriangleStripAdjacency:
+                    int tsaTrianglesCount = data.Length / 6;
+                    int tsaOutIndex = 6;
+
+                    if (tsaTrianglesCount > 0)
+                    {
+                        data[0] = 0;
+                        data[1] = 1;
+                        data[2] = 2;
+                        data[3] = 3;
+                        data[4] = 4;
+                        data[5] = 5;
+                    }
+
+                    for (int tri = 1; tri < tsaTrianglesCount; tri++)
+                    {
+                        int baseIndex = tri * 6;
+
+                        if ((tri & 1) != 0)
+                        {
+                            data[baseIndex] = tsaOutIndex - 2;
+                            data[baseIndex + 1] = tsaOutIndex - 1;
+                            data[baseIndex + 2] = tsaOutIndex - 4;
+                            data[baseIndex + 3] = tsaOutIndex - 3;
+                            data[baseIndex + 4] = tsaOutIndex++;
+                            data[baseIndex + 5] = tsaOutIndex++;
+                        }
+                        else
+                        {
+                            data[baseIndex] = tsaOutIndex - 4;
+                            data[baseIndex + 1] = tsaOutIndex - 3;
+                            data[baseIndex + 2] = tsaOutIndex - 2;
+                            data[baseIndex + 3] = tsaOutIndex - 1;
+                            data[baseIndex + 4] = tsaOutIndex++;
+                            data[baseIndex + 5] = tsaOutIndex++;
+                        }
+                    }
+                    break;
+            }
+
+            ReadOnlySpan<byte> dataBytes = MemoryMarshal.Cast<int, byte>(data);
+
+            BufferHandle buffer = _context.Renderer.CreateBuffer(dataBytes.Length);
+            _context.Renderer.SetBufferData(buffer, 0, dataBytes);
+
+            return new IndexBuffer(buffer, count, dataBytes.Length);
+        }
+
+        /// <summary>
+        /// Gets a buffer texture with a given format, for the given index.
+        /// </summary>
+        /// <param name="index">Index of the buffer texture</param>
+        /// <param name="format">Format of the buffer texture</param>
+        /// <returns>Buffer texture</returns>
+        public ITexture EnsureBufferTexture(int index, Format format)
+        {
+            return (_bufferTextures[index] ??= new()).Get(_context.Renderer, format);
+        }
+
+        /// <summary>
+        /// Gets the offset and size of usable storage on the output vertex buffer.
+        /// </summary>
+        /// <param name="size">Size in bytes that will be used</param>
+        /// <returns>Usable offset and size on the buffer</returns>
+        public (int, int) GetVertexDataBuffer(int size)
+        {
+            return EnsureBuffer(ref _vertexDataBuffer, size);
+        }
+
+        /// <summary>
+        /// Gets the offset and size of usable storage on the output geometry shader vertex buffer.
+        /// </summary>
+        /// <param name="size">Size in bytes that will be used</param>
+        /// <returns>Usable offset and size on the buffer</returns>
+        public (int, int) GetGeometryVertexDataBuffer(int size)
+        {
+            return EnsureBuffer(ref _geometryVertexDataBuffer, size);
+        }
+
+        /// <summary>
+        /// Gets the offset and size of usable storage on the output geometry shader index buffer.
+        /// </summary>
+        /// <param name="size">Size in bytes that will be used</param>
+        /// <returns>Usable offset and size on the buffer</returns>
+        public (int, int) GetGeometryIndexDataBuffer(int size)
+        {
+            return EnsureBuffer(ref _geometryIndexDataBuffer, size);
+        }
+
+        /// <summary>
+        /// Gets a range of the output vertex buffer for binding.
+        /// </summary>
+        /// <param name="offset">Offset of the range</param>
+        /// <param name="size">Size of the range in bytes</param>
+        /// <returns>Range</returns>
+        public BufferRange GetVertexDataBufferRange(int offset, int size)
+        {
+            return new BufferRange(_vertexDataBuffer.Handle, offset, size);
+        }
+
+        /// <summary>
+        /// Gets a range of the output geometry shader vertex buffer for binding.
+        /// </summary>
+        /// <param name="offset">Offset of the range</param>
+        /// <param name="size">Size of the range in bytes</param>
+        /// <returns>Range</returns>
+        public BufferRange GetGeometryVertexDataBufferRange(int offset, int size)
+        {
+            return new BufferRange(_geometryVertexDataBuffer.Handle, offset, size);
+        }
+
+        /// <summary>
+        /// Gets a range of the output geometry shader index buffer for binding.
+        /// </summary>
+        /// <param name="offset">Offset of the range</param>
+        /// <param name="size">Size of the range in bytes</param>
+        /// <returns>Range</returns>
+        public BufferRange GetGeometryIndexDataBufferRange(int offset, int size)
+        {
+            return new BufferRange(_geometryIndexDataBuffer.Handle, offset, size);
+        }
+
+        /// <summary>
+        /// Gets the range for a dummy 16 bytes buffer, filled with zeros.
+        /// </summary>
+        /// <returns>Dummy buffer range</returns>
+        public BufferRange GetDummyBufferRange()
+        {
+            if (_dummyBuffer == BufferHandle.Null)
+            {
+                _dummyBuffer = _context.Renderer.CreateBuffer(DummyBufferSize);
+                _context.Renderer.Pipeline.ClearBuffer(_dummyBuffer, 0, DummyBufferSize, 0);
+            }
+
+            return new BufferRange(_dummyBuffer, 0, DummyBufferSize);
+        }
+
+        /// <summary>
+        /// Gets the range for a sequential index buffer, with ever incrementing index values.
+        /// </summary>
+        /// <param name="count">Minimum number of indices that the buffer should have</param>
+        /// <returns>Buffer handle</returns>
+        public BufferHandle GetSequentialIndexBuffer(int count)
+        {
+            if (_sequentialIndexBufferCount < count)
+            {
+                if (_sequentialIndexBuffer != BufferHandle.Null)
+                {
+                    _context.Renderer.DeleteBuffer(_sequentialIndexBuffer);
+                }
+
+                _sequentialIndexBuffer = _context.Renderer.CreateBuffer(count * sizeof(uint));
+                _sequentialIndexBufferCount = count;
+
+                Span<int> data = new int[count];
+
+                for (int index = 0; index < count; index++)
+                {
+                    data[index] = index;
+                }
+
+                _context.Renderer.SetBufferData(_sequentialIndexBuffer, 0, MemoryMarshal.Cast<int, byte>(data));
+            }
+
+            return _sequentialIndexBuffer;
+        }
+
+        /// <summary>
+        /// Ensure that a buffer exists, is large enough, and allocates a sub-region of the specified size inside the buffer.
+        /// </summary>
+        /// <param name="buffer">Buffer state</param>
+        /// <param name="size">Required size in bytes</param>
+        /// <returns>Allocated offset and size</returns>
+        private (int, int) EnsureBuffer(ref Buffer buffer, int size)
+        {
+            int newSize = buffer.Offset + size;
+
+            if (buffer.Size < newSize)
+            {
+                if (buffer.Handle != BufferHandle.Null)
+                {
+                    _context.Renderer.DeleteBuffer(buffer.Handle);
+                }
+
+                buffer.Handle = _context.Renderer.CreateBuffer(newSize);
+                buffer.Size = newSize;
+            }
+
+            int offset = buffer.Offset;
+
+            buffer.Offset = BitUtils.AlignUp(newSize, _context.Capabilities.StorageBufferOffsetAlignment);
+
+            return (offset, size);
+        }
+
+        /// <summary>
+        /// Frees all buffer sub-regions that were previously allocated.
+        /// </summary>
+        public void FreeBuffers()
+        {
+            _vertexDataBuffer.Offset = 0;
+            _geometryVertexDataBuffer.Offset = 0;
+            _geometryIndexDataBuffer.Offset = 0;
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                for (int index = 0; index < _bufferTextures.Length; index++)
+                {
+                    _bufferTextures[index]?.Dispose();
+                    _bufferTextures[index] = null;
+                }
+
+                DestroyIfNotNull(ref _dummyBuffer);
+                DestroyIfNotNull(ref _vertexDataBuffer.Handle);
+                DestroyIfNotNull(ref _geometryVertexDataBuffer.Handle);
+                DestroyIfNotNull(ref _geometryIndexDataBuffer.Handle);
+                DestroyIfNotNull(ref _sequentialIndexBuffer);
+
+                foreach (var indexBuffer in _topologyRemapBuffers.Values)
+                {
+                    _context.Renderer.DeleteBuffer(indexBuffer.Handle);
+                }
+
+                _topologyRemapBuffers.Clear();
+            }
+        }
+
+        /// <summary>
+        /// Deletes a buffer if the handle is valid (not null), then sets the handle to null.
+        /// </summary>
+        /// <param name="handle">Buffer handle</param>
+        private void DestroyIfNotNull(ref BufferHandle handle)
+        {
+            if (handle != BufferHandle.Null)
+            {
+                _context.Renderer.DeleteBuffer(handle);
+                handle = BufferHandle.Null;
+            }
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+    }
+}
diff --git a/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsComputeState.cs b/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsComputeState.cs
new file mode 100644
index 00000000..59a92508
--- /dev/null
+++ b/src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VtgAsComputeState.cs
@@ -0,0 +1,535 @@
+using Ryujinx.Common;
+using Ryujinx.Common.Logging;
+using Ryujinx.Graphics.GAL;
+using Ryujinx.Graphics.Gpu.Engine.Types;
+using Ryujinx.Graphics.Gpu.Image;
+using Ryujinx.Graphics.Gpu.Shader;
+using Ryujinx.Graphics.Shader;
+using Ryujinx.Graphics.Shader.Translation;
+using System;
+
+namespace Ryujinx.Graphics.Gpu.Engine.Threed.ComputeDraw
+{
+    /// <summary>
+    /// Vertex, tessellation and geometry as compute shader state.
+    /// </summary>
+    struct VtgAsComputeState
+    {
+        private const int ComputeLocalSize = 32;
+
+        private readonly GpuContext _context;
+        private readonly GpuChannel _channel;
+        private readonly DeviceStateWithShadow<ThreedClassState> _state;
+        private readonly VtgAsComputeContext _vacContext;
+        private readonly ThreedClass _engine;
+        private readonly ShaderAsCompute _vertexAsCompute;
+        private readonly ShaderAsCompute _geometryAsCompute;
+        private readonly IProgram _vertexPassthroughProgram;
+        private readonly PrimitiveTopology _topology;
+        private readonly int _count;
+        private readonly int _instanceCount;
+        private readonly int _firstIndex;
+        private readonly int _firstVertex;
+        private readonly int _firstInstance;
+        private readonly bool _indexed;
+
+        private readonly int _vertexDataOffset;
+        private readonly int _vertexDataSize;
+        private readonly int _geometryVertexDataOffset;
+        private readonly int _geometryVertexDataSize;
+        private readonly int _geometryIndexDataOffset;
+        private readonly int _geometryIndexDataSize;
+        private readonly int _geometryIndexDataCount;
+
+        /// <summary>
+        /// Creates a new vertex, tessellation and geometry as compute shader state.
+        /// </summary>
+        /// <param name="context">GPU context</param>
+        /// <param name="channel">GPU channel</param>
+        /// <param name="state">3D engine state</param>
+        /// <param name="vacContext">Vertex as compute context</param>
+        /// <param name="engine">3D engine</param>
+        /// <param name="vertexAsCompute">Vertex shader converted to compute</param>
+        /// <param name="geometryAsCompute">Optional geometry shader converted to compute</param>
+        /// <param name="vertexPassthroughProgram">Fragment shader with a vertex passthrough shader to feed the compute output into the fragment stage</param>
+        /// <param name="topology">Primitive topology of the draw</param>
+        /// <param name="count">Index or vertex count of the draw</param>
+        /// <param name="instanceCount">Instance count</param>
+        /// <param name="firstIndex">First index on the index buffer, for indexed draws</param>
+        /// <param name="firstVertex">First vertex on the vertex buffer</param>
+        /// <param name="firstInstance">First instance</param>
+        /// <param name="indexed">Whether the draw is indexed</param>
+        public VtgAsComputeState(
+            GpuContext context,
+            GpuChannel channel,
+            DeviceStateWithShadow<ThreedClassState> state,
+            VtgAsComputeContext vacContext,
+            ThreedClass engine,
+            ShaderAsCompute vertexAsCompute,
+            ShaderAsCompute geometryAsCompute,
+            IProgram vertexPassthroughProgram,
+            PrimitiveTopology topology,
+            int count,
+            int instanceCount,
+            int firstIndex,
+            int firstVertex,
+            int firstInstance,
+            bool indexed)
+        {
+            _context = context;
+            _channel = channel;
+            _state = state;
+            _vacContext = vacContext;
+            _engine = engine;
+            _vertexAsCompute = vertexAsCompute;
+            _geometryAsCompute = geometryAsCompute;
+            _vertexPassthroughProgram = vertexPassthroughProgram;
+            _topology = topology;
+            _count = count;
+            _instanceCount = instanceCount;
+            _firstIndex = firstIndex;
+            _firstVertex = firstVertex;
+            _firstInstance = firstInstance;
+            _indexed = indexed;
+
+            int vertexDataSize = vertexAsCompute.Reservations.OutputSizeInBytesPerInvocation * count * instanceCount;
+
+            (_vertexDataOffset, _vertexDataSize) = _vacContext.GetVertexDataBuffer(vertexDataSize);
+
+            if (geometryAsCompute != null)
+            {
+                int totalPrimitivesCount = VtgAsComputeContext.GetPrimitivesCount(topology, count * instanceCount);
+                int maxCompleteStrips = GetMaxCompleteStrips(geometryAsCompute.Info.GeometryVerticesPerPrimitive, geometryAsCompute.Info.GeometryMaxOutputVertices);
+                int totalVerticesCount = totalPrimitivesCount * geometryAsCompute.Info.GeometryMaxOutputVertices * geometryAsCompute.Info.ThreadsPerInputPrimitive;
+                int geometryVbDataSize = totalVerticesCount * geometryAsCompute.Reservations.OutputSizeInBytesPerInvocation;
+                int geometryIbDataCount = totalVerticesCount + totalPrimitivesCount * maxCompleteStrips;
+                int geometryIbDataSize = geometryIbDataCount * sizeof(uint);
+
+                (_geometryVertexDataOffset, _geometryVertexDataSize) = vacContext.GetGeometryVertexDataBuffer(geometryVbDataSize);
+                (_geometryIndexDataOffset, _geometryIndexDataSize) = vacContext.GetGeometryIndexDataBuffer(geometryIbDataSize);
+
+                _geometryIndexDataCount = geometryIbDataCount;
+            }
+        }
+
+        /// <summary>
+        /// Emulates the vertex stage using compute.
+        /// </summary>
+        public readonly void RunVertex()
+        {
+            _context.Renderer.Pipeline.SetProgram(_vertexAsCompute.HostProgram);
+
+            int primitivesCount = VtgAsComputeContext.GetPrimitivesCount(_topology, _count);
+
+            _vacContext.VertexInfoBufferUpdater.SetVertexCounts(_count, _instanceCount, _firstVertex, _firstInstance);
+            _vacContext.VertexInfoBufferUpdater.SetGeometryCounts(primitivesCount);
+
+            for (int index = 0; index < Constants.TotalVertexAttribs; index++)
+            {
+                var vertexAttrib = _state.State.VertexAttribState[index];
+
+                if (!FormatTable.TryGetSingleComponentAttribFormat(vertexAttrib.UnpackFormat(), out Format format, out int componentsCount))
+                {
+                    Logger.Debug?.Print(LogClass.Gpu, $"Invalid attribute format 0x{vertexAttrib.UnpackFormat():X}.");
+
+                    format = vertexAttrib.UnpackType() switch
+                    {
+                        VertexAttribType.Sint => Format.R32Sint,
+                        VertexAttribType.Uint => Format.R32Uint,
+                        _ => Format.R32Float
+                    };
+
+                    componentsCount = 4;
+                }
+
+                if (vertexAttrib.UnpackIsConstant())
+                {
+                    _vacContext.VertexInfoBufferUpdater.SetVertexStride(index, 0, componentsCount);
+                    _vacContext.VertexInfoBufferUpdater.SetVertexOffset(index, 0, 0);
+                    SetDummyBufferTexture(_vertexAsCompute.Reservations, index, format);
+                    continue;
+                }
+
+                int bufferIndex = vertexAttrib.UnpackBufferIndex();
+
+                GpuVa endAddress = _state.State.VertexBufferEndAddress[bufferIndex];
+                var vertexBuffer = _state.State.VertexBufferState[bufferIndex];
+                bool instanced = _state.State.VertexBufferInstanced[bufferIndex];
+
+                ulong address = vertexBuffer.Address.Pack();
+
+                if (!vertexBuffer.UnpackEnable() || !_channel.MemoryManager.IsMapped(address))
+                {
+                    _vacContext.VertexInfoBufferUpdater.SetVertexStride(index, 0, componentsCount);
+                    _vacContext.VertexInfoBufferUpdater.SetVertexOffset(index, 0, 0);
+                    SetDummyBufferTexture(_vertexAsCompute.Reservations, index, format);
+                    continue;
+                }
+
+                int vbStride = vertexBuffer.UnpackStride();
+                ulong vbSize = GetVertexBufferSize(address, endAddress.Pack(), vbStride, _indexed, instanced, _firstVertex, _count);
+
+                ulong oldVbSize = vbSize;
+
+                ulong attributeOffset = (ulong)vertexAttrib.UnpackOffset();
+                int componentSize = format.GetScalarSize();
+
+                address += attributeOffset;
+
+                ulong misalign = address & ((ulong)_context.Capabilities.TextureBufferOffsetAlignment - 1);
+
+                vbSize = Align(vbSize - attributeOffset + misalign, componentSize);
+
+                SetBufferTexture(_vertexAsCompute.Reservations, index, format, address - misalign, vbSize);
+
+                _vacContext.VertexInfoBufferUpdater.SetVertexStride(index, vbStride / componentSize, componentsCount);
+                _vacContext.VertexInfoBufferUpdater.SetVertexOffset(index, (int)misalign / componentSize, instanced ? vertexBuffer.Divisor : 0);
+            }
+
+            if (_indexed)
+            {
+                SetIndexBufferTexture(_vertexAsCompute.Reservations, _firstIndex, _count, out int ibOffset);
+                _vacContext.VertexInfoBufferUpdater.SetIndexBufferOffset(ibOffset);
+            }
+            else
+            {
+                SetSequentialIndexBufferTexture(_vertexAsCompute.Reservations, _count);
+                _vacContext.VertexInfoBufferUpdater.SetIndexBufferOffset(0);
+            }
+
+            int vertexInfoBinding = _vertexAsCompute.Reservations.VertexInfoConstantBufferBinding;
+            BufferRange vertexInfoRange = new(_vacContext.VertexInfoBufferUpdater.Handle, 0, VertexInfoBuffer.RequiredSize);
+            _context.Renderer.Pipeline.SetUniformBuffers(stackalloc[] { new BufferAssignment(vertexInfoBinding, vertexInfoRange) });
+
+            int vertexDataBinding = _vertexAsCompute.Reservations.VertexOutputStorageBufferBinding;
+            BufferRange vertexDataRange = _vacContext.GetVertexDataBufferRange(_vertexDataOffset, _vertexDataSize);
+            _context.Renderer.Pipeline.SetStorageBuffers(stackalloc[] { new BufferAssignment(vertexDataBinding, vertexDataRange) });
+
+            _vacContext.VertexInfoBufferUpdater.Commit();
+
+            _context.Renderer.Pipeline.DispatchCompute(
+                BitUtils.DivRoundUp(_count, ComputeLocalSize),
+                BitUtils.DivRoundUp(_instanceCount, ComputeLocalSize),
+                1);
+        }
+
+        /// <summary>
+        /// Emulates the geometry stage using compute, if it exists, otherwise does nothing.
+        /// </summary>
+        public readonly void RunGeometry()
+        {
+            if (_geometryAsCompute == null)
+            {
+                return;
+            }
+
+            int primitivesCount = VtgAsComputeContext.GetPrimitivesCount(_topology, _count);
+
+            _vacContext.VertexInfoBufferUpdater.SetVertexCounts(_count, _instanceCount, _firstVertex, _firstInstance);
+            _vacContext.VertexInfoBufferUpdater.SetGeometryCounts(primitivesCount);
+            _vacContext.VertexInfoBufferUpdater.Commit();
+
+            int vertexInfoBinding = _vertexAsCompute.Reservations.VertexInfoConstantBufferBinding;
+            BufferRange vertexInfoRange = new(_vacContext.VertexInfoBufferUpdater.Handle, 0, VertexInfoBuffer.RequiredSize);
+            _context.Renderer.Pipeline.SetUniformBuffers(stackalloc[] { new BufferAssignment(vertexInfoBinding, vertexInfoRange) });
+
+            int vertexDataBinding = _vertexAsCompute.Reservations.VertexOutputStorageBufferBinding;
+
+            // Wait until compute is done.
+            // TODO: Batch compute and draw operations to avoid pipeline stalls.
+            _context.Renderer.Pipeline.Barrier();
+            _context.Renderer.Pipeline.SetProgram(_geometryAsCompute.HostProgram);
+
+            SetTopologyRemapBufferTexture(_geometryAsCompute.Reservations, _topology, _count);
+
+            int geometryVbBinding = _geometryAsCompute.Reservations.GeometryVertexOutputStorageBufferBinding;
+            int geometryIbBinding = _geometryAsCompute.Reservations.GeometryIndexOutputStorageBufferBinding;
+
+            BufferRange vertexDataRange = _vacContext.GetVertexDataBufferRange(_vertexDataOffset, _vertexDataSize);
+            BufferRange vertexBuffer = _vacContext.GetGeometryVertexDataBufferRange(_geometryVertexDataOffset, _geometryVertexDataSize);
+            BufferRange indexBuffer = _vacContext.GetGeometryIndexDataBufferRange(_geometryIndexDataOffset, _geometryIndexDataSize);
+
+            _context.Renderer.Pipeline.SetStorageBuffers(stackalloc[]
+            {
+                new BufferAssignment(vertexDataBinding, vertexDataRange),
+                new BufferAssignment(geometryVbBinding, vertexBuffer),
+                new BufferAssignment(geometryIbBinding, indexBuffer),
+            });
+
+            _context.Renderer.Pipeline.DispatchCompute(
+                BitUtils.DivRoundUp(primitivesCount, ComputeLocalSize),
+                BitUtils.DivRoundUp(_instanceCount, ComputeLocalSize),
+                _geometryAsCompute.Info.ThreadsPerInputPrimitive);
+        }
+
+        /// <summary>
+        /// Performs a draw using the data produced on the vertex, tessellation and geometry stages,
+        /// if rasterizer discard is disabled.
+        /// </summary>
+        public readonly void RunFragment()
+        {
+            bool tfEnabled = _state.State.TfEnable;
+
+            if (!_state.State.RasterizeEnable && (!tfEnabled || !_context.Capabilities.SupportsTransformFeedback))
+            {
+                // No need to run fragment if rasterizer discard is enabled,
+                // and we are emulating transform feedback or transform feedback is disabled.
+
+                // Note: We might skip geometry shader here, but right now, this is fine,
+                // because the only cases that triggers VTG to compute are geometry shader
+                // being not supported, or the vertex pipeline doing store operations.
+                // If the geometry shader does not do any store and rasterizer discard is enabled, the geometry shader can be skipped.
+                // If the geometry shader does have stores, it would have been converted to compute too if stores are not supported.
+
+                return;
+            }
+
+            int vertexDataBinding = _vertexAsCompute.Reservations.VertexOutputStorageBufferBinding;
+
+            _context.Renderer.Pipeline.Barrier();
+
+            _vacContext.VertexInfoBufferUpdater.SetVertexCounts(_count, _instanceCount, _firstVertex, _firstInstance);
+            _vacContext.VertexInfoBufferUpdater.Commit();
+
+            if (_geometryAsCompute != null)
+            {
+                BufferRange vertexBuffer = _vacContext.GetGeometryVertexDataBufferRange(_geometryVertexDataOffset, _geometryVertexDataSize);
+                BufferRange indexBuffer = _vacContext.GetGeometryIndexDataBufferRange(_geometryIndexDataOffset, _geometryIndexDataSize);
+
+                _context.Renderer.Pipeline.SetProgram(_vertexPassthroughProgram);
+                _context.Renderer.Pipeline.SetIndexBuffer(indexBuffer, IndexType.UInt);
+                _context.Renderer.Pipeline.SetStorageBuffers(stackalloc[] { new BufferAssignment(vertexDataBinding, vertexBuffer) });
+
+                _context.Renderer.Pipeline.SetPrimitiveRestart(true, -1);
+                _context.Renderer.Pipeline.SetPrimitiveTopology(GetGeometryOutputTopology(_geometryAsCompute.Info.GeometryVerticesPerPrimitive));
+
+                _context.Renderer.Pipeline.DrawIndexed(_geometryIndexDataCount, 1, 0, 0, 0);
+
+                _engine.ForceStateDirtyByIndex(StateUpdater.IndexBufferStateIndex);
+                _engine.ForceStateDirtyByIndex(StateUpdater.PrimitiveRestartStateIndex);
+            }
+            else
+            {
+                BufferRange vertexDataRange = _vacContext.GetVertexDataBufferRange(_vertexDataOffset, _vertexDataSize);
+
+                _context.Renderer.Pipeline.SetProgram(_vertexPassthroughProgram);
+                _context.Renderer.Pipeline.SetStorageBuffers(stackalloc[] { new BufferAssignment(vertexDataBinding, vertexDataRange) });
+                _context.Renderer.Pipeline.Draw(_count, _instanceCount, 0, 0);
+            }
+        }
+
+        /// <summary>
+        /// Gets a strip primitive topology from the vertices per primitive count.
+        /// </summary>
+        /// <param name="verticesPerPrimitive">Vertices per primitive count</param>
+        /// <returns>Primitive topology</returns>
+        private static PrimitiveTopology GetGeometryOutputTopology(int verticesPerPrimitive)
+        {
+            return verticesPerPrimitive switch
+            {
+                3 => PrimitiveTopology.TriangleStrip,
+                2 => PrimitiveTopology.LineStrip,
+                _ => PrimitiveTopology.Points,
+            };
+        }
+
+        /// <summary>
+        /// Gets the maximum number of complete primitive strips for a vertex count.
+        /// </summary>
+        /// <param name="verticesPerPrimitive">Vertices per primitive count</param>
+        /// <param name="maxOutputVertices">Maximum geometry shader output vertices count</param>
+        /// <returns>Maximum number of complete primitive strips</returns>
+        private static int GetMaxCompleteStrips(int verticesPerPrimitive, int maxOutputVertices)
+        {
+            return maxOutputVertices / verticesPerPrimitive;
+        }
+
+        /// <summary>
+        /// Binds a dummy buffer as vertex buffer into a buffer texture.
+        /// </summary>
+        /// <param name="reservations">Shader resource binding reservations</param>
+        /// <param name="index">Buffer texture index</param>
+        /// <param name="format">Buffer texture format</param>
+        private readonly void SetDummyBufferTexture(ResourceReservations reservations, int index, Format format)
+        {
+            ITexture bufferTexture = _vacContext.EnsureBufferTexture(index + 2, format);
+            bufferTexture.SetStorage(_vacContext.GetDummyBufferRange());
+
+            _context.Renderer.Pipeline.SetTextureAndSampler(ShaderStage.Compute, reservations.GetVertexBufferTextureBinding(index), bufferTexture, null);
+        }
+
+        /// <summary>
+        /// Binds a vertex buffer into a buffer texture.
+        /// </summary>
+        /// <param name="reservations">Shader resource binding reservations</param>
+        /// <param name="index">Buffer texture index</param>
+        /// <param name="format">Buffer texture format</param>
+        /// <param name="address">Address of the vertex buffer</param>
+        /// <param name="size">Size of the buffer in bytes</param>
+        private readonly void SetBufferTexture(ResourceReservations reservations, int index, Format format, ulong address, ulong size)
+        {
+            var memoryManager = _channel.MemoryManager;
+
+            address = memoryManager.Translate(address);
+            BufferRange range = memoryManager.Physical.BufferCache.GetBufferRange(address, size);
+
+            ITexture bufferTexture = _vacContext.EnsureBufferTexture(index + 2, format);
+            bufferTexture.SetStorage(range);
+
+            _context.Renderer.Pipeline.SetTextureAndSampler(ShaderStage.Compute, reservations.GetVertexBufferTextureBinding(index), bufferTexture, null);
+        }
+
+        /// <summary>
+        /// Binds the index buffer into a buffer texture.
+        /// </summary>
+        /// <param name="reservations">Shader resource binding reservations</param>
+        /// <param name="firstIndex">First index of the index buffer</param>
+        /// <param name="count">Index count</param>
+        /// <param name="misalignedOffset">Offset that should be added when accessing the buffer texture on the shader</param>
+        private readonly void SetIndexBufferTexture(ResourceReservations reservations, int firstIndex, int count, out int misalignedOffset)
+        {
+            ulong address = _state.State.IndexBufferState.Address.Pack();
+            ulong indexOffset = (ulong)firstIndex;
+            ulong size = (ulong)count;
+
+            int shift = 0;
+            Format format = Format.R8Uint;
+
+            switch (_state.State.IndexBufferState.Type)
+            {
+                case IndexType.UShort:
+                    shift = 1;
+                    format = Format.R16Uint;
+                    break;
+                case IndexType.UInt:
+                    shift = 2;
+                    format = Format.R32Uint;
+                    break;
+            }
+
+            indexOffset <<= shift;
+            size <<= shift;
+
+            var memoryManager = _channel.MemoryManager;
+
+            address = memoryManager.Translate(address + indexOffset);
+            ulong misalign = address & ((ulong)_context.Capabilities.TextureBufferOffsetAlignment - 1);
+            BufferRange range = memoryManager.Physical.BufferCache.GetBufferRange(address - misalign, size + misalign);
+            misalignedOffset = (int)misalign >> shift;
+
+            SetIndexBufferTexture(reservations, range, format);
+        }
+
+        /// <summary>
+        /// Sets the host buffer texture for the index buffer.
+        /// </summary>
+        /// <param name="reservations">Shader resource binding reservations</param>
+        /// <param name="range">Index buffer range</param>
+        /// <param name="format">Index buffer format</param>
+        private readonly void SetIndexBufferTexture(ResourceReservations reservations, BufferRange range, Format format)
+        {
+            ITexture bufferTexture = _vacContext.EnsureBufferTexture(0, format);
+            bufferTexture.SetStorage(range);
+
+            _context.Renderer.Pipeline.SetTextureAndSampler(ShaderStage.Compute, reservations.IndexBufferTextureBinding, bufferTexture, null);
+        }
+
+        /// <summary>
+        /// Sets the host buffer texture for the topology remap buffer.
+        /// </summary>
+        /// <param name="reservations">Shader resource binding reservations</param>
+        /// <param name="topology">Input topology</param>
+        /// <param name="count">Input vertex count</param>
+        private readonly void SetTopologyRemapBufferTexture(ResourceReservations reservations, PrimitiveTopology topology, int count)
+        {
+            ITexture bufferTexture = _vacContext.EnsureBufferTexture(1, Format.R32Uint);
+            bufferTexture.SetStorage(_vacContext.GetOrCreateTopologyRemapBuffer(topology, count));
+
+            _context.Renderer.Pipeline.SetTextureAndSampler(ShaderStage.Compute, reservations.TopologyRemapBufferTextureBinding, bufferTexture, null);
+        }
+
+        /// <summary>
+        /// Sets the host buffer texture to a generated sequential index buffer.
+        /// </summary>
+        /// <param name="reservations">Shader resource binding reservations</param>
+        /// <param name="count">Vertex count</param>
+        private readonly void SetSequentialIndexBufferTexture(ResourceReservations reservations, int count)
+        {
+            BufferHandle sequentialIndexBuffer = _vacContext.GetSequentialIndexBuffer(count);
+
+            ITexture bufferTexture = _vacContext.EnsureBufferTexture(0, Format.R32Uint);
+            bufferTexture.SetStorage(new BufferRange(sequentialIndexBuffer, 0, count * sizeof(uint)));
+
+            _context.Renderer.Pipeline.SetTextureAndSampler(ShaderStage.Compute, reservations.IndexBufferTextureBinding, bufferTexture, null);
+        }
+
+        /// <summary>
+        /// Gets the size of a vertex buffer based on the current 3D engine state.
+        /// </summary>
+        /// <param name="vbAddress">Vertex buffer address</param>
+        /// <param name="vbEndAddress">Vertex buffer end address (exclusive)</param>
+        /// <param name="vbStride">Vertex buffer stride</param>
+        /// <param name="indexed">Whether the draw is indexed</param>
+        /// <param name="instanced">Whether the draw is instanced</param>
+        /// <param name="firstVertex">First vertex index</param>
+        /// <param name="vertexCount">Vertex count</param>
+        /// <returns>Size of the vertex buffer, in bytes</returns>
+        private readonly ulong GetVertexBufferSize(ulong vbAddress, ulong vbEndAddress, int vbStride, bool indexed, bool instanced, int firstVertex, int vertexCount)
+        {
+            IndexType indexType = _state.State.IndexBufferState.Type;
+            bool indexTypeSmall = indexType == IndexType.UByte || indexType == IndexType.UShort;
+            ulong vbSize = vbEndAddress - vbAddress + 1;
+            ulong size;
+
+            if (indexed || vbStride == 0 || instanced)
+            {
+                // This size may be (much) larger than the real vertex buffer size.
+                // Avoid calculating it this way, unless we don't have any other option.
+
+                size = vbSize;
+
+                if (vbStride > 0 && indexTypeSmall && indexed && !instanced)
+                {
+                    // If the index type is a small integer type, then we might be still able
+                    // to reduce the vertex buffer size based on the maximum possible index value.
+
+                    ulong maxVertexBufferSize = indexType == IndexType.UByte ? 0x100UL : 0x10000UL;
+
+                    maxVertexBufferSize += _state.State.FirstVertex;
+                    maxVertexBufferSize *= (uint)vbStride;
+
+                    size = Math.Min(size, maxVertexBufferSize);
+                }
+            }
+            else
+            {
+                // For non-indexed draws, we can guess the size from the vertex count
+                // and stride.
+
+                int firstInstance = (int)_state.State.FirstInstance;
+
+                size = Math.Min(vbSize, (ulong)((firstInstance + firstVertex + vertexCount) * vbStride));
+            }
+
+            return size;
+        }
+
+        /// <summary>
+        /// Aligns a size to a given alignment value.
+        /// </summary>
+        /// <param name="size">Size</param>
+        /// <param name="alignment">Alignment</param>
+        /// <returns>Aligned size</returns>
+        private static ulong Align(ulong size, int alignment)
+        {
+            ulong align = (ulong)alignment;
+
+            size += align - 1;
+
+            size /= align;
+            size *= align;
+
+            return size;
+        }
+    }
+}