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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);
}
}
}
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