MulAvailable
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Nitload
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//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="TimeSequence"
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// Project: StgSharp
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// AuthorGroup: Nitload
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// Copyright (c) Nitload. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using StgSharp.Timing;
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using System;
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using System.Runtime.CompilerServices;
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namespace StgSharp.Common.Timing
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{
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public abstract class TimeSequence
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{
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public long BeginningTick { get; protected set; }
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public long EndingTick { get; protected set; }
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public long PreviousFrameTick { get; protected set; }
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public static TimeSequence CreateLinear(double totalSeconds, double frameSeconds) => new LinearTimeSequence(totalSeconds, frameSeconds);
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public static TimeSequence CreateLogarithmic(
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double initialSliceSeconds,
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double totalSeconds,
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double growthMultiplier,
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double minSliceSeconds) => new LogTimeSequence(initialSliceSeconds,
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totalSeconds,
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growthMultiplier,
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minSliceSeconds);
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public abstract bool EndsAt(long currentTick);
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public abstract bool IsNextFrameReady(long currentTick);
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public abstract void StartFrom(TimeSourceProviderBase source);
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}
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internal sealed class LinearTimeSequence : TimeSequence
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{
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private readonly double _frameSeconds;
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private readonly double _totalSeconds;
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private long _frameLengthTicks;
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public LinearTimeSequence(double totalSeconds, double frameSeconds)
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{
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ArgumentOutOfRangeException.ThrowIfNegativeOrZero(totalSeconds);
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ArgumentOutOfRangeException.ThrowIfNegativeOrZero(frameSeconds);
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if (frameSeconds > totalSeconds) {
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throw new ArgumentException("Frame length greater than total length.");
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}
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_totalSeconds = totalSeconds;
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_frameSeconds = frameSeconds;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override bool EndsAt(long currentTick) => currentTick >= EndingTick;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override bool IsNextFrameReady(long currentTick)
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{
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long span = currentTick - PreviousFrameTick;
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if (span >= _frameLengthTicks && currentTick < EndingTick)
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{
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PreviousFrameTick += _frameLengthTicks;
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return true;
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}
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return false;
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}
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public override void StartFrom(TimeSourceProviderBase source)
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{
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long f = source?.Frequency ?? throw new ArgumentNullException(nameof(source));
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_frameLengthTicks = (long)Math.Max(1, _frameSeconds * f);
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long totalTicks = (long)Math.Max(_frameLengthTicks, Math.Round(_totalSeconds * f, MidpointRounding.AwayFromZero));
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BeginningTick = source.GetCurrentTimeSpanTick();
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EndingTick = BeginningTick + totalTicks;
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EndingTick = EndingTick < 0 ? long.MaxValue : EndingTick;
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PreviousFrameTick = BeginningTick;
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}
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}
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/// <summary>
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/// Logarithmic time sequence with growth factor and minimum slice length enforcement.
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/// </summary>
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internal sealed class LogTimeSequence : TimeSequence
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{
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private bool _finalEmitted;
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private readonly double _initialSeconds;
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private double _lastBoundarySecondsAdjusted;
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private readonly double _minSliceSeconds;
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private readonly double _multiplier;
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private double _nextBoundarySecondsAdjusted;
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private readonly double _totalSeconds;
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private int _sliceIndex;
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private long _freq;
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private long _nextBoundaryTick;
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private long _totalTicks;
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public LogTimeSequence(
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double initialSliceSeconds,
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double totalSeconds,
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double growthMultiplier,
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double minSliceSeconds)
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{
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ArgumentOutOfRangeException.ThrowIfNegativeOrZero(initialSliceSeconds);
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ArgumentOutOfRangeException.ThrowIfNegativeOrZero(totalSeconds);
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ArgumentOutOfRangeException.ThrowIfNegativeOrZero(growthMultiplier);
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ArgumentOutOfRangeException.ThrowIfNegativeOrZero(minSliceSeconds);
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if (growthMultiplier < 1.0) {
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throw new ArgumentException("growthMultiplier must be >= 1");
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}
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if (initialSliceSeconds > totalSeconds) {
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throw new ArgumentException("Initial slice length greater than total length.");
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}
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_initialSeconds = initialSliceSeconds;
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_totalSeconds = totalSeconds;
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_multiplier = growthMultiplier;
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_minSliceSeconds = minSliceSeconds;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override bool EndsAt(long currentTick) => currentTick >= EndingTick;
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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public override bool IsNextFrameReady(long currentTick)
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{
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// Emit final once when reaching or passing end.
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if (currentTick >= EndingTick)
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{
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if (_finalEmitted) {
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return false;
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}
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PreviousFrameTick = EndingTick;
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_finalEmitted = true;
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return true;
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}
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// Not reached end: only when we cross the next boundary tick do we emit.
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if (currentTick < _nextBoundaryTick)
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{
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return false;
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}
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// Advance to this boundary.
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PreviousFrameTick = _nextBoundaryTick;
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_lastBoundarySecondsAdjusted = _nextBoundarySecondsAdjusted;
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_sliceIndex++;
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// Compute next cumulative boundary seconds with multiplier, then enforce min-slice and total cap.
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double next = _initialSeconds * Math.Pow(_multiplier, _sliceIndex);
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if (next > _totalSeconds) {
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next = _totalSeconds;
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}
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double delta = next - _lastBoundarySecondsAdjusted;
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if (delta < _minSliceSeconds)
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{
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next = _lastBoundarySecondsAdjusted + _minSliceSeconds;
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if (next > _totalSeconds) {
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next = _totalSeconds;
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}
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}
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_nextBoundarySecondsAdjusted = next;
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_nextBoundaryTick = (_nextBoundarySecondsAdjusted >= _totalSeconds) ?
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EndingTick :
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BeginningTick + SecondsToTicks(_nextBoundarySecondsAdjusted);
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return true;
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}
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public override void StartFrom(TimeSourceProviderBase source)
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{
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_freq = source?.Frequency ?? throw new ArgumentNullException(nameof(source));
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BeginningTick = source.GetCurrentTimeSpanTick();
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_totalTicks = SecondsToTicks(_totalSeconds);
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EndingTick = BeginningTick + _totalTicks;
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_sliceIndex = 0;
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_lastBoundarySecondsAdjusted = 0.0;
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_nextBoundarySecondsAdjusted = _initialSeconds;
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_nextBoundaryTick = BeginningTick + SecondsToTicks(_nextBoundarySecondsAdjusted);
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PreviousFrameTick = BeginningTick;
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_finalEmitted = false;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private long SecondsToTicks(double seconds) => (long)Math.Max(1L, Math.Round(seconds * _freq, MidpointRounding.AwayFromZero));
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}
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}
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