1 files changed, 101 insertions, 0 deletions
diff --git a/src/Ryujinx.Graphics.GAL/SupportBufferUpdater.cs b/src/Ryujinx.Graphics.GAL/SupportBufferUpdater.cs
new file mode 100644
index 00000000..6eeddb6c
--- /dev/null
+++ b/src/Ryujinx.Graphics.GAL/SupportBufferUpdater.cs
@@ -0,0 +1,101 @@
+using Ryujinx.Graphics.Shader;
+using System;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Graphics.GAL
+{
+    public class SupportBufferUpdater : IDisposable
+    {
+        public SupportBuffer Data;
+        public BufferHandle Handle;
+
+        private IRenderer _renderer;
+        private int _startOffset = -1;
+        private int _endOffset = -1;
+
+        public SupportBufferUpdater(IRenderer renderer)
+        {
+            _renderer = renderer;
+            Handle = renderer.CreateBuffer(SupportBuffer.RequiredSize);
+            renderer.Pipeline.ClearBuffer(Handle, 0, SupportBuffer.RequiredSize, 0);
+        }
+
+        private void MarkDirty(int startOffset, int byteSize)
+        {
+            int endOffset = startOffset + byteSize;
+
+            if (_startOffset == -1)
+            {
+                _startOffset = startOffset;
+                _endOffset = endOffset;
+            }
+            else
+            {
+                if (startOffset < _startOffset)
+                {
+                    _startOffset = startOffset;
+                }
+
+                if (endOffset > _endOffset)
+                {
+                    _endOffset = endOffset;
+                }
+            }
+        }
+
+        public void UpdateFragmentRenderScaleCount(int count)
+        {
+            if (Data.FragmentRenderScaleCount.X != count)
+            {
+                Data.FragmentRenderScaleCount.X = count;
+
+                MarkDirty(SupportBuffer.FragmentRenderScaleCountOffset, sizeof(int));
+            }
+        }
+
+        private void UpdateGenericField<T>(int baseOffset, ReadOnlySpan<T> data, Span<T> target, int offset, int count) where T : unmanaged
+        {
+            data.Slice(0, count).CopyTo(target.Slice(offset));
+
+            int elemSize = Unsafe.SizeOf<T>();
+
+            MarkDirty(baseOffset + offset * elemSize, count * elemSize);
+        }
+
+        public void UpdateRenderScale(ReadOnlySpan<Vector4<float>> data, int offset, int count)
+        {
+            UpdateGenericField(SupportBuffer.GraphicsRenderScaleOffset, data, Data.RenderScale.AsSpan(), offset, count);
+        }
+
+        public void UpdateFragmentIsBgra(ReadOnlySpan<Vector4<int>> data, int offset, int count)
+        {
+            UpdateGenericField(SupportBuffer.FragmentIsBgraOffset, data, Data.FragmentIsBgra.AsSpan(), offset, count);
+        }
+
+        public void UpdateViewportInverse(Vector4<float> data)
+        {
+            Data.ViewportInverse = data;
+
+            MarkDirty(SupportBuffer.ViewportInverseOffset, SupportBuffer.FieldSize);
+        }
+
+        public void Commit()
+        {
+            if (_startOffset != -1)
+            {
+                ReadOnlySpan<byte> data = MemoryMarshal.Cast<SupportBuffer, byte>(MemoryMarshal.CreateSpan(ref Data, 1));
+
+                _renderer.SetBufferData(Handle, _startOffset, data.Slice(_startOffset, _endOffset - _startOffset));
+
+                _startOffset = -1;
+                _endOffset = -1;
+            }
+        }
+
+        public void Dispose()
+        {
+            _renderer.DeleteBuffer(Handle);
+        }
+    }
+}