Ryujinx/Ryujinx.Graphics.Texture/SizeInfo.cs

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using System;
namespace Ryujinx.Graphics.Texture
{
public struct SizeInfo
{
private readonly int[] _mipOffsets;
private readonly int[] _allOffsets;
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private readonly int _levels;
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public int LayerSize { get; }
public int TotalSize { get; }
public SizeInfo(int size)
{
_mipOffsets = new int[] { 0 };
_allOffsets = new int[] { 0 };
_levels = 1;
LayerSize = size;
TotalSize = size;
}
internal SizeInfo(
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int[] mipOffsets,
int[] allOffsets,
int levels,
int layerSize,
int totalSize)
{
_mipOffsets = mipOffsets;
_allOffsets = allOffsets;
_levels = levels;
LayerSize = layerSize;
TotalSize = totalSize;
}
public int GetMipOffset(int level)
{
if ((uint)level >= _mipOffsets.Length)
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{
throw new ArgumentOutOfRangeException(nameof(level));
}
return _mipOffsets[level];
}
public bool FindView(int offset, int size, out int firstLayer, out int firstLevel)
{
int index = Array.BinarySearch(_allOffsets, offset);
if (index < 0)
{
firstLayer = 0;
firstLevel = 0;
return false;
}
firstLayer = index / _levels;
firstLevel = index - (firstLayer * _levels);
return true;
}
}
}