Ryujinx/Ryujinx.Graphics.Gpu/Engine/MethodReport.cs

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using Ryujinx.Common;
using Ryujinx.Graphics.GAL;
using Ryujinx.Graphics.Gpu.Memory;
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using Ryujinx.Graphics.Gpu.State;
using System;
using System.Runtime.InteropServices;
namespace Ryujinx.Graphics.Gpu.Engine
{
partial class Methods
{
private const int NsToTicksFractionNumerator = 384;
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private const int NsToTicksFractionDenominator = 625;
private readonly CounterCache _counterCache = new CounterCache();
/// <summary>
/// Writes a GPU counter to guest memory.
/// </summary>
/// <param name="state">Current GPU state</param>
/// <param name="argument">Method call argument</param>
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private void Report(GpuState state, int argument)
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{
SemaphoreOperation op = (SemaphoreOperation)(argument & 3);
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ReportCounterType type = (ReportCounterType)((argument >> 23) & 0x1f);
switch (op)
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{
case SemaphoreOperation.Release: ReleaseSemaphore(state); break;
case SemaphoreOperation.Counter: ReportCounter(state, type); break;
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}
}
/// <summary>
/// Writes (or Releases) a GPU semaphore value to guest memory.
/// </summary>
/// <param name="state">Current GPU state</param>
private void ReleaseSemaphore(GpuState state)
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{
var rs = state.Get<SemaphoreState>(MethodOffset.ReportState);
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_context.MemoryAccessor.Write(rs.Address.Pack(), rs.Payload);
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_context.AdvanceSequence();
}
/// <summary>
/// Packed GPU counter data (including GPU timestamp) in memory.
/// </summary>
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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>
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private void ReportCounter(GpuState state, ReportCounterType type)
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{
CounterData counterData = new CounterData();
var rs = state.Get<SemaphoreState>(MethodOffset.ReportState);
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ulong gpuVa = rs.Address.Pack();
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ulong ticks = ConvertNanosecondsToTicks((ulong)PerformanceCounter.ElapsedNanoseconds);
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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;
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}
ICounterEvent counter = null;
EventHandler<ulong> resultHandler = (object evt, ulong result) =>
{
counterData.Counter = result;
counterData.Timestamp = ticks;
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Span<CounterData> counterDataSpan = MemoryMarshal.CreateSpan(ref counterData, 1);
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Span<byte> data = MemoryMarshal.Cast<CounterData, byte>(counterDataSpan);
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if (counter?.Invalid != true)
{
_context.MemoryAccessor.Write(gpuVa, data);
}
};
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switch (type)
{
case ReportCounterType.Zero:
resultHandler(null, 0);
break;
case ReportCounterType.SamplesPassed:
counter = _context.Renderer.ReportCounter(CounterType.SamplesPassed, resultHandler);
break;
case ReportCounterType.PrimitivesGenerated:
counter = _context.Renderer.ReportCounter(CounterType.PrimitivesGenerated, resultHandler);
break;
case ReportCounterType.TransformFeedbackPrimitivesWritten:
counter = _context.Renderer.ReportCounter(CounterType.TransformFeedbackPrimitivesWritten, resultHandler);
break;
}
_counterCache.AddOrUpdate(gpuVa, counter);
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}
/// <summary>
/// Converts a nanoseconds timestamp value to Maxwell time ticks.
/// </summary>
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/// <remarks>
/// The frequency is 614400000 Hz.
/// </remarks>
/// <param name="nanoseconds">Timestamp in nanoseconds</param>
/// <returns>Maxwell ticks</returns>
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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.
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ulong divided = nanoseconds / NsToTicksFractionDenominator;
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ulong rounded = divided * NsToTicksFractionDenominator;
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ulong errorBias = (nanoseconds - rounded) * NsToTicksFractionNumerator / NsToTicksFractionDenominator;
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return divided * NsToTicksFractionNumerator + errorBias;
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}
}
}