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namespace Ryujinx.Graphics.Vulkan
{
internal class BufferUsageBitmap
{
private readonly BitMap _bitmap;
private readonly int _size;
private readonly int _granularity;
private readonly int _bits;
private readonly int _writeBitOffset;
private readonly int _intsPerCb;
private readonly int _bitsPerCb;
public BufferUsageBitmap(int size, int granularity)
{
_size = size;
_granularity = granularity;
// There are two sets of bits - one for read tracking, and the other for write.
int bits = (size + (granularity - 1)) / granularity;
_writeBitOffset = bits;
_bits = bits << 1;
_intsPerCb = (_bits + (BitMap.IntSize - 1)) / BitMap.IntSize;
_bitsPerCb = _intsPerCb * BitMap.IntSize;
_bitmap = new BitMap(_bitsPerCb * CommandBufferPool.MaxCommandBuffers);
}
public void Add(int cbIndex, int offset, int size, bool write)
{
if (size == 0)
{
return;
}
// Some usages can be out of bounds (vertex buffer on amd), so bound if necessary.
if (offset + size > _size)
{
size = _size - offset;
}
int cbBase = cbIndex * _bitsPerCb + (write ? _writeBitOffset : 0);
int start = cbBase + offset / _granularity;
int end = cbBase + (offset + size - 1) / _granularity;
_bitmap.SetRange(start, end);
}
public bool OverlapsWith(int cbIndex, int offset, int size, bool write = false)
{
if (size == 0)
{
return false;
}
int cbBase = cbIndex * _bitsPerCb + (write ? _writeBitOffset : 0);
int start = cbBase + offset / _granularity;
int end = cbBase + (offset + size - 1) / _granularity;
return _bitmap.IsSet(start, end);
}
public bool OverlapsWith(int offset, int size, bool write)
{
for (int i = 0; i < CommandBufferPool.MaxCommandBuffers; i++)
{
if (OverlapsWith(i, offset, size, write))
{
return true;
}
}
return false;
}
public void Clear(int cbIndex)
{
_bitmap.ClearInt(cbIndex * _intsPerCb, (cbIndex + 1) * _intsPerCb - 1);
}
}
}
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