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using Ryujinx.Common;
using System.Numerics;
using System.Runtime.CompilerServices;
using static Ryujinx.Graphics.Texture.BlockLinearConstants;
namespace Ryujinx.Graphics.Texture
{
class BlockLinearLayout
{
private struct RobAndSliceSizes
{
public int RobSize;
public int SliceSize;
public RobAndSliceSizes(int robSize, int sliceSize)
{
RobSize = robSize;
SliceSize = sliceSize;
}
}
private readonly int _texBpp;
private readonly int _bhMask;
private readonly int _bdMask;
private readonly int _bhShift;
private readonly int _bdShift;
private readonly int _bppShift;
private readonly int _xShift;
private readonly int _robSize;
private readonly int _sliceSize;
// Variables for built in iteration.
private int _yPart;
private int _yzPart;
private int _zPart;
public BlockLinearLayout(
int width,
int height,
int gobBlocksInY,
int gobBlocksInZ,
int bpp)
{
_texBpp = bpp;
_bppShift = BitOperations.TrailingZeroCount(bpp);
_bhMask = gobBlocksInY - 1;
_bdMask = gobBlocksInZ - 1;
_bhShift = BitOperations.TrailingZeroCount(gobBlocksInY);
_bdShift = BitOperations.TrailingZeroCount(gobBlocksInZ);
_xShift = BitOperations.TrailingZeroCount(GobSize * gobBlocksInY * gobBlocksInZ);
RobAndSliceSizes rsSizes = GetRobAndSliceSizes(width, height, gobBlocksInY, gobBlocksInZ);
_robSize = rsSizes.RobSize;
_sliceSize = rsSizes.SliceSize;
}
private RobAndSliceSizes GetRobAndSliceSizes(int width, int height, int gobBlocksInY, int gobBlocksInZ)
{
int widthInGobs = BitUtils.DivRoundUp(width * _texBpp, GobStride);
int robSize = GobSize * gobBlocksInY * gobBlocksInZ * widthInGobs;
int sliceSize = BitUtils.DivRoundUp(height, gobBlocksInY * GobHeight) * robSize;
return new RobAndSliceSizes(robSize, sliceSize);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetOffset(int x, int y, int z)
{
return GetOffsetWithLineOffset(x << _bppShift, y, z);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetOffsetWithLineOffset(int x, int y, int z)
{
int yh = y / GobHeight;
int offset = (z >> _bdShift) * _sliceSize + (yh >> _bhShift) * _robSize;
offset += (x / GobStride) << _xShift;
offset += (yh & _bhMask) * GobSize;
offset += ((z & _bdMask) * GobSize) << _bhShift;
offset += ((x & 0x3f) >> 5) << 8;
offset += ((y & 0x07) >> 1) << 6;
offset += ((x & 0x1f) >> 4) << 5;
offset += ((y & 0x01) >> 0) << 4;
offset += ((x & 0x0f) >> 0) << 0;
return offset;
}
public (int offset, int size) GetRectangleRange(int x, int y, int width, int height)
{
// Justification:
// The 2D offset is a combination of separate x and y parts.
// Both components increase with input and never overlap bits.
// Therefore for each component, the minimum input value is the lowest that component can go.
// Minimum total value is minimum X component + minimum Y component. Similar goes for maximum.
int start = GetOffset(x, y, 0);
int end = GetOffset(x + width - 1, y + height - 1, 0) + _texBpp; // Cover the last pixel.
return (start, end - start);
}
public bool LayoutMatches(BlockLinearLayout other)
{
return _robSize == other._robSize &&
_sliceSize == other._sliceSize &&
_texBpp == other._texBpp &&
_bhMask == other._bhMask &&
_bdMask == other._bdMask;
}
// Functions for built in iteration.
// Components of the offset can be updated separately, and combined to save some time.
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void SetY(int y)
{
int yh = y / GobHeight;
int offset = (yh >> _bhShift) * _robSize;
offset += (yh & _bhMask) * GobSize;
offset += ((y & 0x07) >> 1) << 6;
offset += ((y & 0x01) >> 0) << 4;
_yPart = offset;
_yzPart = offset + _zPart;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public void SetZ(int z)
{
int offset = (z >> _bdShift) * _sliceSize;
offset += ((z & _bdMask) * GobSize) << _bhShift;
_zPart = offset;
_yzPart = offset + _yPart;
}
/// <summary>
/// Optimized conversion for line offset in bytes to an absolute offset. Input x must be divisible by 16.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetOffsetWithLineOffset16(int x)
{
int offset = (x / GobStride) << _xShift;
offset += ((x & 0x3f) >> 5) << 8;
offset += ((x & 0x1f) >> 4) << 5;
return offset + _yzPart;
}
/// <summary>
/// Optimized conversion for line offset in bytes to an absolute offset. Input x must be divisible by 64.
/// </summary>
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetOffsetWithLineOffset64(int x)
{
int offset = (x / GobStride) << _xShift;
return offset + _yzPart;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public int GetOffset(int x)
{
x <<= _bppShift;
int offset = (x / GobStride) << _xShift;
offset += ((x & 0x3f) >> 5) << 8;
offset += ((x & 0x1f) >> 4) << 5;
offset += (x & 0x0f);
return offset + _yzPart;
}
}
}
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