From f09bba82b9366e5912b639a610ae89cbb1cf352c Mon Sep 17 00:00:00 2001
From: gdkchan <gab.dark.100@gmail.com>
Date: Tue, 29 Aug 2023 21:10:34 -0300
Subject: 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
---
 .../Threed/ComputeDraw/VertexInfoBufferUpdater.cs  | 141 +++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VertexInfoBufferUpdater.cs

(limited to 'src/Ryujinx.Graphics.Gpu/Engine/Threed/ComputeDraw/VertexInfoBufferUpdater.cs')

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)));
+        }
+    }
+}
-- 
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