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using System;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.Gpu.State
{
class GpuState
{
private const int RegistersCount = 0xe00;
public delegate void MethodCallback(GpuState state, int argument);
private int[] _backingMemory;
private struct Register
{
public MethodCallback Callback;
public MethodOffset BaseOffset;
public int Stride;
public int Count;
public bool Modified;
}
private Register[] _registers;
public GpuState()
{
_backingMemory = new int[RegistersCount];
_registers = new Register[RegistersCount];
for (int index = 0; index < _registers.Length; index++)
{
_registers[index].BaseOffset = (MethodOffset)index;
_registers[index].Stride = 1;
_registers[index].Count = 1;
_registers[index].Modified = true;
}
foreach (var item in GpuStateTable.Table)
{
int totalRegs = item.Size * item.Count;
for (int regOffset = 0; regOffset < totalRegs; regOffset++)
{
int index = (int)item.Offset + regOffset;
_registers[index].BaseOffset = item.Offset;
_registers[index].Stride = item.Size;
_registers[index].Count = item.Count;
}
}
InitializeDefaultState();
}
public void CallMethod(MethodParams meth)
{
Register register = _registers[meth.Method];
if (_backingMemory[meth.Method] != meth.Argument)
{
_registers[(int)register.BaseOffset].Modified = true;
}
_backingMemory[meth.Method] = meth.Argument;
MethodCallback callback = register.Callback;
if (callback != null)
{
callback(this, meth.Argument);
}
}
public int Read(int offset)
{
return _backingMemory[offset];
}
public void SetUniformBufferOffset(int offset)
{
_backingMemory[(int)MethodOffset.UniformBufferState + 3] = offset;
}
private void InitializeDefaultState()
{
// Depth ranges.
for (int index = 0; index < 8; index++)
{
_backingMemory[(int)MethodOffset.ViewportExtents + index * 4 + 2] = 0;
_backingMemory[(int)MethodOffset.ViewportExtents + index * 4 + 3] = 0x3F800000;
}
// Default front stencil mask.
_backingMemory[0x4e7] = 0xff;
// Default color mask.
_backingMemory[(int)MethodOffset.RtColorMask] = 0x1111;
}
public void RegisterCallback(MethodOffset offset, int count, MethodCallback callback)
{
for (int index = 0; index < count; index++)
{
_registers[(int)offset + index].Callback = callback;
}
}
public void RegisterCallback(MethodOffset offset, MethodCallback callback)
{
_registers[(int)offset].Callback = callback;
}
public bool QueryModified(MethodOffset offset)
{
bool modified = _registers[(int)offset].Modified;
_registers[(int)offset].Modified = false;
return modified;
}
public bool QueryModified(MethodOffset m1, MethodOffset m2)
{
bool modified = _registers[(int)m1].Modified ||
_registers[(int)m2].Modified;
_registers[(int)m1].Modified = false;
_registers[(int)m2].Modified = false;
return modified;
}
public bool QueryModified(MethodOffset m1, MethodOffset m2, MethodOffset m3)
{
bool modified = _registers[(int)m1].Modified ||
_registers[(int)m2].Modified ||
_registers[(int)m3].Modified;
_registers[(int)m1].Modified = false;
_registers[(int)m2].Modified = false;
_registers[(int)m3].Modified = false;
return modified;
}
public bool QueryModified(MethodOffset m1, MethodOffset m2, MethodOffset m3, MethodOffset m4)
{
bool modified = _registers[(int)m1].Modified ||
_registers[(int)m2].Modified ||
_registers[(int)m3].Modified ||
_registers[(int)m4].Modified;
_registers[(int)m1].Modified = false;
_registers[(int)m2].Modified = false;
_registers[(int)m3].Modified = false;
_registers[(int)m4].Modified = false;
return modified;
}
public T Get<T>(MethodOffset offset, int index) where T : struct
{
Register register = _registers[(int)offset];
if ((uint)index >= register.Count)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
return Get<T>(offset + index * register.Stride);
}
public T Get<T>(MethodOffset offset) where T : struct
{
return MemoryMarshal.Cast<int, T>(_backingMemory.AsSpan().Slice((int)offset))[0];
}
}
}
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