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using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.Texture.Astc
{
[StructLayout(LayoutKind.Sequential)]
struct AstcPixel
{
internal const int StructSize = 12;
public short A;
public short R;
public short G;
public short B;
private uint _bitDepthInt;
private Span<byte> BitDepth => MemoryMarshal.CreateSpan(ref Unsafe.As<uint, byte>(ref _bitDepthInt), 4);
private Span<short> Components => MemoryMarshal.CreateSpan(ref A, 4);
public AstcPixel(short a, short r, short g, short b)
{
A = a;
R = r;
G = g;
B = b;
_bitDepthInt = 0x08080808;
}
public void ClampByte()
{
R = Math.Min(Math.Max(R, (short)0), (short)255);
G = Math.Min(Math.Max(G, (short)0), (short)255);
B = Math.Min(Math.Max(B, (short)0), (short)255);
A = Math.Min(Math.Max(A, (short)0), (short)255);
}
public short GetComponent(int index)
{
return Components[index];
}
public void SetComponent(int index, int value)
{
Components[index] = (short)value;
}
public int Pack()
{
return A << 24 |
B << 16 |
G << 8 |
R << 0;
}
// Adds more precision to the blue channel as described
// in C.2.14
public static AstcPixel BlueContract(int a, int r, int g, int b)
{
return new AstcPixel((short)(a),
(short)((r + b) >> 1),
(short)((g + b) >> 1),
(short)(b));
}
}
}
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