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using Ryujinx.Common;
using System;
using System.Runtime.CompilerServices;
using static Ryujinx.Graphics.Texture.BlockLinearConstants;
namespace Ryujinx.Graphics.Texture
{
public class OffsetCalculator
{
private readonly int _width;
private readonly int _height;
private readonly int _stride;
private readonly bool _isLinear;
private readonly int _bytesPerPixel;
private readonly BlockLinearLayout _layoutConverter;
// Variables for built in iteration.
private int _yPart;
public OffsetCalculator(
int width,
int height,
int stride,
bool isLinear,
int gobBlocksInY,
int gobBlocksInZ,
int bytesPerPixel)
{
_width = width;
_height = height;
_stride = stride;
_isLinear = isLinear;
_bytesPerPixel = bytesPerPixel;
int wAlignment = GobStride / bytesPerPixel;
int wAligned = BitUtils.AlignUp(width, wAlignment);
if (!isLinear)
{
_layoutConverter = new BlockLinearLayout(
wAligned,
height,
gobBlocksInY,
gobBlocksInZ,
bytesPerPixel);
}
}
public OffsetCalculator(
int width,
int height,
int stride,
bool isLinear,
int gobBlocksInY,
int bytesPerPixel) : this(width, height, stride, isLinear, gobBlocksInY, 1, bytesPerPixel)
{
}
public void SetY(int y)
{
if (_isLinear)
{
_yPart = y * _stride;
}
else
{
_layoutConverter.SetY(y);
}
}
public int GetOffset(int x, int y)
{
if (_isLinear)
{
return x * _bytesPerPixel + y * _stride;
}
else
{
return _layoutConverter.GetOffset(x, y, 0);
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetOffset(int x)
{
if (_isLinear)
{
return x * _bytesPerPixel + _yPart;
}
else
{
return _layoutConverter.GetOffset(x);
}
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetOffsetWithLineOffset64(int x)
{
if (_isLinear)
{
return x + _yPart;
}
else
{
return _layoutConverter.GetOffsetWithLineOffset64(x);
}
}
public (int offset, int size) GetRectangleRange(int x, int y, int width, int height)
{
if (_isLinear)
{
int start = y * Math.Abs(_stride) + x * _bytesPerPixel;
int end = (y + height - 1) * Math.Abs(_stride) + (x + width) * _bytesPerPixel;
return (y * _stride + x * _bytesPerPixel, end - start);
}
else
{
return _layoutConverter.GetRectangleRange(x, y, width, height);
}
}
public bool LayoutMatches(OffsetCalculator other)
{
if (_isLinear)
{
return other._isLinear &&
_width == other._width &&
_height == other._height &&
_stride == other._stride &&
_bytesPerPixel == other._bytesPerPixel;
}
else
{
return !other._isLinear && _layoutConverter.LayoutMatches(other._layoutConverter);
}
}
}
}
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