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using Ryujinx.Common;
using Ryujinx.Common.Memory;
using System;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics;
using System.Runtime.Intrinsics.X86;
namespace Ryujinx.Graphics.Texture
{
public static class PixelConverter
{
private static (int remainder, int outRemainder, int height) GetLineRemainders(int length, int width, int bpp, int outBpp)
{
int stride = BitUtils.AlignUp(width * bpp, LayoutConverter.HostStrideAlignment);
int remainder = stride / bpp - width;
int outStride = BitUtils.AlignUp(width * outBpp, LayoutConverter.HostStrideAlignment);
int outRemainder = outStride / outBpp - width;
return (remainder, outRemainder, length / stride);
}
public unsafe static MemoryOwner<byte> ConvertR4G4ToR4G4B4A4(ReadOnlySpan<byte> data, int width)
{
MemoryOwner<byte> output = MemoryOwner<byte>.Rent(data.Length * 2);
Span<byte> outputSpan = output.Span;
(int remainder, int outRemainder, int height) = GetLineRemainders(data.Length, width, 1, 2);
Span<ushort> outputSpanUInt16 = MemoryMarshal.Cast<byte, ushort>(outputSpan);
if (remainder == 0)
{
int start = 0;
if (Sse41.IsSupported)
{
int sizeTrunc = data.Length & ~7;
start = sizeTrunc;
fixed (byte* inputPtr = data, outputPtr = outputSpan)
{
for (ulong offset = 0; offset < (ulong)sizeTrunc; offset += 8)
{
Sse2.Store(outputPtr + offset * 2, Sse41.ConvertToVector128Int16(inputPtr + offset).AsByte());
}
}
}
for (int i = start; i < data.Length; i++)
{
outputSpanUInt16[i] = data[i];
}
}
else
{
int offset = 0;
int outOffset = 0;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
outputSpanUInt16[outOffset++] = data[offset++];
}
offset += remainder;
outOffset += outRemainder;
}
}
return output;
}
public static MemoryOwner<byte> ConvertR5G6B5ToR8G8B8A8(ReadOnlySpan<byte> data, int width)
{
MemoryOwner<byte> output = MemoryOwner<byte>.Rent(data.Length * 2);
int offset = 0;
int outOffset = 0;
(int remainder, int outRemainder, int height) = GetLineRemainders(data.Length, width, 2, 4);
ReadOnlySpan<ushort> inputSpan = MemoryMarshal.Cast<byte, ushort>(data);
Span<uint> outputSpan = MemoryMarshal.Cast<byte, uint>(output.Span);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
uint packed = inputSpan[offset++];
uint outputPacked = 0xff000000;
outputPacked |= (packed << 3) & 0x000000f8;
outputPacked |= (packed << 8) & 0x00f80000;
// Replicate 5 bit components.
outputPacked |= (outputPacked >> 5) & 0x00070007;
// Include and replicate 6 bit component.
outputPacked |= ((packed << 5) & 0x0000fc00) | ((packed >> 1) & 0x00000300);
outputSpan[outOffset++] = outputPacked;
}
offset += remainder;
outOffset += outRemainder;
}
return output;
}
public static MemoryOwner<byte> ConvertR5G5B5ToR8G8B8A8(ReadOnlySpan<byte> data, int width, bool forceAlpha)
{
MemoryOwner<byte> output = MemoryOwner<byte>.Rent(data.Length * 2);
int offset = 0;
int outOffset = 0;
(int remainder, int outRemainder, int height) = GetLineRemainders(data.Length, width, 2, 4);
ReadOnlySpan<ushort> inputSpan = MemoryMarshal.Cast<byte, ushort>(data);
Span<uint> outputSpan = MemoryMarshal.Cast<byte, uint>(output.Span);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
uint packed = inputSpan[offset++];
uint a = forceAlpha ? 1 : (packed >> 15);
uint outputPacked = a * 0xff000000;
outputPacked |= (packed << 3) & 0x000000f8;
outputPacked |= (packed << 6) & 0x0000f800;
outputPacked |= (packed << 9) & 0x00f80000;
// Replicate 5 bit components.
outputPacked |= (outputPacked >> 5) & 0x00070707;
outputSpan[outOffset++] = outputPacked;
}
offset += remainder;
outOffset += outRemainder;
}
return output;
}
public static MemoryOwner<byte> ConvertA1B5G5R5ToR8G8B8A8(ReadOnlySpan<byte> data, int width)
{
MemoryOwner<byte> output = MemoryOwner<byte>.Rent(data.Length * 2);
int offset = 0;
int outOffset = 0;
(int remainder, int outRemainder, int height) = GetLineRemainders(data.Length, width, 2, 4);
ReadOnlySpan<ushort> inputSpan = MemoryMarshal.Cast<byte, ushort>(data);
Span<uint> outputSpan = MemoryMarshal.Cast<byte, uint>(output.Span);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
uint packed = inputSpan[offset++];
uint a = packed >> 15;
uint outputPacked = a * 0xff000000;
outputPacked |= (packed >> 8) & 0x000000f8;
outputPacked |= (packed << 5) & 0x0000f800;
outputPacked |= (packed << 18) & 0x00f80000;
// Replicate 5 bit components.
outputPacked |= (outputPacked >> 5) & 0x00070707;
outputSpan[outOffset++] = outputPacked;
}
offset += remainder;
outOffset += outRemainder;
}
return output;
}
public static MemoryOwner<byte> ConvertR4G4B4A4ToR8G8B8A8(ReadOnlySpan<byte> data, int width)
{
MemoryOwner<byte> output = MemoryOwner<byte>.Rent(data.Length * 2);
int offset = 0;
int outOffset = 0;
(int remainder, int outRemainder, int height) = GetLineRemainders(data.Length, width, 2, 4);
ReadOnlySpan<ushort> inputSpan = MemoryMarshal.Cast<byte, ushort>(data);
Span<uint> outputSpan = MemoryMarshal.Cast<byte, uint>(output.Span);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
uint packed = inputSpan[offset++];
uint outputPacked = packed & 0x0000000f;
outputPacked |= (packed << 4) & 0x00000f00;
outputPacked |= (packed << 8) & 0x000f0000;
outputPacked |= (packed << 12) & 0x0f000000;
outputSpan[outOffset++] = outputPacked * 0x11;
}
offset += remainder;
outOffset += outRemainder;
}
return output;
}
}
}
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