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using Ryujinx.Common;
using Ryujinx.Graphics.GAL;
using Ryujinx.Graphics.Gpu.State;
using System;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.Gpu.Engine
{
partial class Methods
{
private const int NsToTicksFractionNumerator = 384;
private const int NsToTicksFractionDenominator = 625;
/// <summary>
/// Writes a GPU counter to guest memory.
/// </summary>
/// <param name="state">Current GPU state</param>
/// <param name="argument">Method call argument</param>
private void Report(GpuState state, int argument)
{
ReportMode mode = (ReportMode)(argument & 3);
ReportCounterType type = (ReportCounterType)((argument >> 23) & 0x1f);
switch (mode)
{
case ReportMode.Release: ReleaseSemaphore(state); break;
case ReportMode.Counter: ReportCounter(state, type); break;
}
}
/// <summary>
/// Writes (or Releases) a GPU semaphore value to guest memory.
/// </summary>
/// <param name="state">Current GPU state</param>
private void ReleaseSemaphore(GpuState state)
{
var rs = state.Get<ReportState>(MethodOffset.ReportState);
_context.MemoryAccessor.Write(rs.Address.Pack(), rs.Payload);
_context.AdvanceSequence();
}
/// <summary>
/// Packed GPU counter data (including GPU timestamp) in memory.
/// </summary>
private struct CounterData
{
public ulong Counter;
public ulong Timestamp;
}
/// <summary>
/// Writes a GPU counter to guest memory.
/// This also writes the current timestamp value.
/// </summary>
/// <param name="state">Current GPU state</param>
/// <param name="type">Counter to be written to memory</param>
private void ReportCounter(GpuState state, ReportCounterType type)
{
CounterData counterData = new CounterData();
ulong counter = 0;
switch (type)
{
case ReportCounterType.Zero:
counter = 0;
break;
case ReportCounterType.SamplesPassed:
counter = _context.Renderer.GetCounter(CounterType.SamplesPassed);
break;
case ReportCounterType.PrimitivesGenerated:
counter = _context.Renderer.GetCounter(CounterType.PrimitivesGenerated);
break;
case ReportCounterType.TransformFeedbackPrimitivesWritten:
counter = _context.Renderer.GetCounter(CounterType.TransformFeedbackPrimitivesWritten);
break;
}
ulong ticks = ConvertNanosecondsToTicks((ulong)PerformanceCounter.ElapsedNanoseconds);
if (GraphicsConfig.FastGpuTime)
{
// Divide by some amount to report time as if operations were performed faster than they really are.
// This can prevent some games from switching to a lower resolution because rendering is too slow.
ticks /= 256;
}
counterData.Counter = counter;
counterData.Timestamp = ticks;
Span<CounterData> counterDataSpan = MemoryMarshal.CreateSpan(ref counterData, 1);
Span<byte> data = MemoryMarshal.Cast<CounterData, byte>(counterDataSpan);
var rs = state.Get<ReportState>(MethodOffset.ReportState);
_context.MemoryAccessor.Write(rs.Address.Pack(), data);
}
/// <summary>
/// Converts a nanoseconds timestamp value to Maxwell time ticks.
/// </summary>
/// <remarks>
/// The frequency is 614400000 Hz.
/// </remarks>
/// <param name="nanoseconds">Timestamp in nanoseconds</param>
/// <returns>Maxwell ticks</returns>
private static ulong ConvertNanosecondsToTicks(ulong nanoseconds)
{
// We need to divide first to avoid overflows.
// We fix up the result later by calculating the difference and adding
// that to the result.
ulong divided = nanoseconds / NsToTicksFractionDenominator;
ulong rounded = divided * NsToTicksFractionDenominator;
ulong errorBias = (nanoseconds - rounded) * NsToTicksFractionNumerator / NsToTicksFractionDenominator;
return divided * NsToTicksFractionNumerator + errorBias;
}
}
}
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