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using Silk.NET.Vulkan;
using System;
namespace Ryujinx.Graphics.Vulkan
{
internal struct IndexBufferState
{
public static IndexBufferState Null => new IndexBufferState(GAL.BufferHandle.Null, 0, 0);
private readonly int _offset;
private readonly int _size;
private readonly IndexType _type;
private readonly GAL.BufferHandle _handle;
private Auto<DisposableBuffer> _buffer;
public IndexBufferState(GAL.BufferHandle handle, int offset, int size, IndexType type)
{
_handle = handle;
_offset = offset;
_size = size;
_type = type;
_buffer = null;
}
public IndexBufferState(GAL.BufferHandle handle, int offset, int size)
{
_handle = handle;
_offset = offset;
_size = size;
_type = IndexType.Uint16;
_buffer = null;
}
public void BindIndexBuffer(VulkanRenderer gd, CommandBufferScoped cbs)
{
Auto<DisposableBuffer> autoBuffer;
int offset, size;
IndexType type = _type;
if (_type == IndexType.Uint8Ext && !gd.Capabilities.SupportsIndexTypeUint8)
{
// Index type is not supported. Convert to I16.
autoBuffer = gd.BufferManager.GetBufferI8ToI16(cbs, _handle, _offset, _size);
type = IndexType.Uint16;
offset = 0;
size = _size * 2;
}
else
{
autoBuffer = gd.BufferManager.GetBuffer(cbs.CommandBuffer, _handle, false, out int bufferSize);
if (_offset >= bufferSize)
{
autoBuffer = null;
}
offset = _offset;
size = _size;
}
_buffer = autoBuffer;
if (autoBuffer != null)
{
gd.Api.CmdBindIndexBuffer(cbs.CommandBuffer, autoBuffer.Get(cbs, offset, size).Value, (ulong)offset, type);
}
}
public void BindConvertedIndexBuffer(VulkanRenderer gd, CommandBufferScoped cbs, int firstIndex, int indexCount, int convertedCount, IndexBufferPattern pattern)
{
Auto<DisposableBuffer> autoBuffer;
// Convert the index buffer using the given pattern.
int indexSize = _type switch
{
IndexType.Uint32 => 4,
IndexType.Uint16 => 2,
_ => 1,
};
int firstIndexOffset = firstIndex * indexSize;
autoBuffer = gd.BufferManager.GetBufferTopologyConversion(cbs, _handle, _offset + firstIndexOffset, indexCount * indexSize, pattern, indexSize);
int size = convertedCount * 4;
_buffer = autoBuffer;
if (autoBuffer != null)
{
gd.Api.CmdBindIndexBuffer(cbs.CommandBuffer, autoBuffer.Get(cbs, 0, size).Value, 0, IndexType.Uint32);
}
}
public bool BoundEquals(Auto<DisposableBuffer> buffer)
{
return _buffer == buffer;
}
}
}
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