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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.Device
{
public class DeviceState<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicFields)] TState> : IDeviceState where TState : unmanaged
{
private const int RegisterSize = sizeof(int);
public TState State;
private uint Size => (uint)(Unsafe.SizeOf<TState>() + RegisterSize - 1) / RegisterSize;
private readonly Func<int>[] _readCallbacks;
private readonly Action<int>[] _writeCallbacks;
private readonly Dictionary<uint, string> _fieldNamesForDebug;
private readonly Action<string> _debugLogCallback;
public DeviceState(IReadOnlyDictionary<string, RwCallback> callbacks = null, Action<string> debugLogCallback = null)
{
_readCallbacks = new Func<int>[Size];
_writeCallbacks = new Action<int>[Size];
if (debugLogCallback != null)
{
_fieldNamesForDebug = new Dictionary<uint, string>();
_debugLogCallback = debugLogCallback;
}
var fields = typeof(TState).GetFields();
int offset = 0;
for (int fieldIndex = 0; fieldIndex < fields.Length; fieldIndex++)
{
var field = fields[fieldIndex];
int sizeOfField = SizeCalculator.SizeOf(field.FieldType);
for (int i = 0; i < ((sizeOfField + 3) & ~3); i += 4)
{
int index = (offset + i) / RegisterSize;
if (callbacks != null && callbacks.TryGetValue(field.Name, out var cb))
{
if (cb.Read != null)
{
_readCallbacks[index] = cb.Read;
}
if (cb.Write != null)
{
_writeCallbacks[index] = cb.Write;
}
}
}
if (debugLogCallback != null)
{
_fieldNamesForDebug.Add((uint)offset, field.Name);
}
offset += sizeOfField;
}
Debug.Assert(offset == Unsafe.SizeOf<TState>());
}
public int Read(int offset)
{
uint index = (uint)offset / RegisterSize;
if (index < Size)
{
uint alignedOffset = index * RegisterSize;
var readCallback = Unsafe.Add(ref MemoryMarshal.GetArrayDataReference(_readCallbacks), (IntPtr)index);
if (readCallback != null)
{
return readCallback();
}
else
{
return GetRefUnchecked<int>(alignedOffset);
}
}
return 0;
}
public void Write(int offset, int data)
{
uint index = (uint)offset / RegisterSize;
if (index < Size)
{
uint alignedOffset = index * RegisterSize;
DebugWrite(alignedOffset, data);
GetRefIntAlignedUncheck(index) = data;
Unsafe.Add(ref MemoryMarshal.GetArrayDataReference(_writeCallbacks), (IntPtr)index)?.Invoke(data);
}
}
public void WriteWithRedundancyCheck(int offset, int data, out bool changed)
{
uint index = (uint)offset / RegisterSize;
if (index < Size)
{
uint alignedOffset = index * RegisterSize;
DebugWrite(alignedOffset, data);
ref var storage = ref GetRefIntAlignedUncheck(index);
changed = storage != data;
storage = data;
Unsafe.Add(ref MemoryMarshal.GetArrayDataReference(_writeCallbacks), (IntPtr)index)?.Invoke(data);
}
else
{
changed = false;
}
}
[Conditional("DEBUG")]
private void DebugWrite(uint alignedOffset, int data)
{
if (_fieldNamesForDebug != null && _fieldNamesForDebug.TryGetValue(alignedOffset, out string fieldName))
{
_debugLogCallback($"{typeof(TState).Name}.{fieldName} = 0x{data:X}");
}
}
public ref T GetRef<T>(int offset) where T : unmanaged
{
if ((uint)(offset + Unsafe.SizeOf<T>()) > Unsafe.SizeOf<TState>())
{
throw new ArgumentOutOfRangeException(nameof(offset));
}
return ref GetRefUnchecked<T>((uint)offset);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private ref T GetRefUnchecked<T>(uint offset) where T : unmanaged
{
return ref Unsafe.As<TState, T>(ref Unsafe.AddByteOffset(ref State, (IntPtr)offset));
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private ref int GetRefIntAlignedUncheck(ulong index)
{
return ref Unsafe.Add(ref Unsafe.As<TState, int>(ref State), (IntPtr)index);
}
}
}
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