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using Ryujinx.Graphics.Gpu.Memory;
using Ryujinx.Graphics.Gpu.State;
using System;
using System.Runtime.CompilerServices;
namespace Ryujinx.Graphics.Gpu.Engine.GPFifo
{
/// <summary>
/// Represents a GPU General Purpose FIFO command processor.
/// </summary>
class GPFifoProcessor
{
private const int MacrosCount = 0x80;
private const int MacroIndexMask = MacrosCount - 1;
private readonly GpuContext _context;
private readonly GpuChannel _channel;
public MemoryManager MemoryManager => _channel.MemoryManager;
/// <summary>
/// Internal GPFIFO state.
/// </summary>
private struct DmaState
{
public int Method;
public int SubChannel;
public int MethodCount;
public bool NonIncrementing;
public bool IncrementOnce;
}
private DmaState _state;
private readonly GpuState[] _subChannels;
private readonly GPFifoClass _fifoClass;
/// <summary>
/// Creates a new instance of the GPU General Purpose FIFO command processor.
/// </summary>
/// <param name="context">GPU context</param>
/// <param name="channel">Channel that the GPFIFO processor belongs to</param>
public GPFifoProcessor(GpuContext context, GpuChannel channel)
{
_context = context;
_channel = channel;
_fifoClass = new GPFifoClass(context, this);
_subChannels = new GpuState[8];
for (int index = 0; index < _subChannels.Length; index++)
{
_subChannels[index] = new GpuState(channel);
_context.Methods.RegisterCallbacks(_subChannels[index]);
}
}
/// <summary>
/// Processes a command buffer.
/// </summary>
/// <param name="commandBuffer">Command buffer</param>
public void Process(ReadOnlySpan<int> commandBuffer)
{
for (int index = 0; index < commandBuffer.Length; index++)
{
int command = commandBuffer[index];
if (_state.MethodCount != 0)
{
Send(new MethodParams(_state.Method, command, _state.SubChannel, _state.MethodCount));
if (!_state.NonIncrementing)
{
_state.Method++;
}
if (_state.IncrementOnce)
{
_state.NonIncrementing = true;
}
_state.MethodCount--;
}
else
{
CompressedMethod meth = Unsafe.As<int, CompressedMethod>(ref command);
if (TryFastUniformBufferUpdate(meth, commandBuffer, index))
{
index += meth.MethodCount;
continue;
}
switch (meth.SecOp)
{
case SecOp.IncMethod:
case SecOp.NonIncMethod:
case SecOp.OneInc:
_state.Method = meth.MethodAddress;
_state.SubChannel = meth.MethodSubchannel;
_state.MethodCount = meth.MethodCount;
_state.IncrementOnce = meth.SecOp == SecOp.OneInc;
_state.NonIncrementing = meth.SecOp == SecOp.NonIncMethod;
break;
case SecOp.ImmdDataMethod:
Send(new MethodParams(meth.MethodAddress, meth.ImmdData, meth.MethodSubchannel, 1));
break;
}
}
}
}
/// <summary>
/// Tries to perform a fast constant buffer data update.
/// If successful, all data will be copied at once, and <see cref="CompressedMethod.MethodCount"/> + 1
/// command buffer entries will be consumed.
/// </summary>
/// <param name="meth">Compressed method to be checked</param>
/// <param name="commandBuffer">Command buffer where <paramref name="meth"/> is contained</param>
/// <param name="offset">Offset at <paramref name="commandBuffer"/> where <paramref name="meth"/> is located</param>
/// <returns>True if the fast copy was successful, false otherwise</returns>
private bool TryFastUniformBufferUpdate(CompressedMethod meth, ReadOnlySpan<int> commandBuffer, int offset)
{
int availableCount = commandBuffer.Length - offset;
if (meth.MethodCount < availableCount &&
meth.SecOp == SecOp.NonIncMethod &&
meth.MethodAddress == (int)MethodOffset.UniformBufferUpdateData)
{
GpuState state = _subChannels[meth.MethodSubchannel];
_context.Methods.UniformBufferUpdate(state, commandBuffer.Slice(offset + 1, meth.MethodCount));
return true;
}
return false;
}
/// <summary>
/// Sends a uncompressed method for processing by the graphics pipeline.
/// </summary>
/// <param name="meth">Method to be processed</param>
private void Send(MethodParams meth)
{
if ((MethodOffset)meth.Method == MethodOffset.BindChannel)
{
_subChannels[meth.SubChannel].ClearCallbacks();
_context.Methods.RegisterCallbacks(_subChannels[meth.SubChannel]);
}
else if (meth.Method < 0x60)
{
// TODO: check if macros are shared between subchannels or not. For now let's assume they are.
_fifoClass.Write(meth.Method * 4, meth.Argument);
}
else if (meth.Method < 0xe00)
{
_subChannels[meth.SubChannel].CallMethod(meth);
}
else
{
int macroIndex = (meth.Method >> 1) & MacroIndexMask;
if ((meth.Method & 1) != 0)
{
_fifoClass.MmePushArgument(macroIndex, meth.Argument);
}
else
{
_fifoClass.MmeStart(macroIndex, meth.Argument);
}
if (meth.IsLastCall)
{
_fifoClass.CallMme(macroIndex, _subChannels[meth.SubChannel]);
_context.Methods.PerformDeferredDraws();
}
}
}
/// <summary>
/// Sets the shadow ram control value of all sub-channels.
/// </summary>
/// <param name="control">New shadow ram control value</param>
public void SetShadowRamControl(ShadowRamControl control)
{
for (int i = 0; i < _subChannels.Length; i++)
{
_subChannels[i].ShadowRamControl = control;
}
}
/// <summary>
/// Forces a full host state update by marking all state as modified,
/// and also requests all GPU resources in use to be rebound.
/// </summary>
public void ForceAllDirty()
{
for (int index = 0; index < _subChannels.Length; index++)
{
_subChannels[index].ForceAllDirty();
}
}
}
}
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