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using Ryujinx.Common.Logging;
using System;
using System.Diagnostics;
using System.Linq;
namespace Ryujinx.Graphics.Vulkan
{
internal class AutoFlushCounter
{
// How often to flush on framebuffer change.
private readonly static long _framebufferFlushTimer = Stopwatch.Frequency / 1000; // (1ms)
// How often to flush on draw when fast flush mode is enabled.
private readonly static long _drawFlushTimer = Stopwatch.Frequency / 666; // (1.5ms)
// Average wait time that triggers fast flush mode to be entered.
private readonly static long _fastFlushEnterThreshold = Stopwatch.Frequency / 666; // (1.5ms)
// Average wait time that triggers fast flush mode to be exited.
private readonly static long _fastFlushExitThreshold = Stopwatch.Frequency / 10000; // (0.1ms)
// Number of frames to average waiting times over.
private const int SyncWaitAverageCount = 20;
private const int MinDrawCountForFlush = 10;
private const int MinConsecutiveQueryForFlush = 10;
private const int InitialQueryCountForFlush = 32;
private readonly VulkanRenderer _gd;
private long _lastFlush;
private ulong _lastDrawCount;
private bool _hasPendingQuery;
private int _consecutiveQueries;
private int _queryCount;
private readonly int[] _queryCountHistory = new int[3];
private int _queryCountHistoryIndex;
private int _remainingQueries;
private readonly long[] _syncWaitHistory = new long[SyncWaitAverageCount];
private int _syncWaitHistoryIndex;
private bool _fastFlushMode;
public AutoFlushCounter(VulkanRenderer gd)
{
_gd = gd;
}
public void RegisterFlush(ulong drawCount)
{
_lastFlush = Stopwatch.GetTimestamp();
_lastDrawCount = drawCount;
_hasPendingQuery = false;
_consecutiveQueries = 0;
}
public bool RegisterPendingQuery()
{
_hasPendingQuery = true;
_consecutiveQueries++;
_remainingQueries--;
_queryCountHistory[_queryCountHistoryIndex]++;
// Interrupt render passes to flush queries, so that early results arrive sooner.
if (++_queryCount == InitialQueryCountForFlush)
{
return true;
}
return false;
}
public int GetRemainingQueries()
{
if (_remainingQueries <= 0)
{
_remainingQueries = 16;
}
if (_queryCount < InitialQueryCountForFlush)
{
return Math.Min(InitialQueryCountForFlush - _queryCount, _remainingQueries);
}
return _remainingQueries;
}
public bool ShouldFlushQuery()
{
return _hasPendingQuery;
}
public bool ShouldFlushDraw(ulong drawCount)
{
if (_fastFlushMode)
{
long draws = (long)(drawCount - _lastDrawCount);
if (draws < MinDrawCountForFlush)
{
if (draws == 0)
{
_lastFlush = Stopwatch.GetTimestamp();
}
return false;
}
long flushTimeout = _drawFlushTimer;
long now = Stopwatch.GetTimestamp();
return now > _lastFlush + flushTimeout;
}
return false;
}
public bool ShouldFlushAttachmentChange(ulong drawCount)
{
_queryCount = 0;
// Flush when there's an attachment change out of a large block of queries.
if (_consecutiveQueries > MinConsecutiveQueryForFlush)
{
return true;
}
_consecutiveQueries = 0;
long draws = (long)(drawCount - _lastDrawCount);
if (draws < MinDrawCountForFlush)
{
if (draws == 0)
{
_lastFlush = Stopwatch.GetTimestamp();
}
return false;
}
long flushTimeout = _framebufferFlushTimer;
long now = Stopwatch.GetTimestamp();
return now > _lastFlush + flushTimeout;
}
public void Present()
{
// Query flush prediction.
_queryCountHistoryIndex = (_queryCountHistoryIndex + 1) % 3;
_remainingQueries = _queryCountHistory.Max() + 10;
_queryCountHistory[_queryCountHistoryIndex] = 0;
// Fast flush mode toggle.
_syncWaitHistory[_syncWaitHistoryIndex] = _gd.SyncManager.GetAndResetWaitTicks();
_syncWaitHistoryIndex = (_syncWaitHistoryIndex + 1) % SyncWaitAverageCount;
long averageWait = (long)_syncWaitHistory.Average();
if (_fastFlushMode ? averageWait < _fastFlushExitThreshold : averageWait > _fastFlushEnterThreshold)
{
_fastFlushMode = !_fastFlushMode;
Logger.Debug?.PrintMsg(LogClass.Gpu, $"Switched fast flush mode: ({_fastFlushMode})");
}
}
}
}
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