private void Update(StreamableResource resource, ref DateTime now)
{
Debug.Assert(resource != null && resource.CanBeUpdated, $"resource[{resource}] != null && resource.CanBeUpdated[{resource?.CanBeUpdated}]");
var options = resource.StreamingOptions ?? StreamingOptions.Default;
var isUnderBudget = AllocatedMemory < TargetedMemoryBudget;
// Calculate target quality for that asset
StreamingQuality targetQuality = StreamingQuality.Mininum;
if (isUnderBudget || resource.LastTimeUsed > 0 || options.KeepLoaded)
{
var lastUsageTimespan = new TimeSpan((frameIndex - resource.LastTimeUsed) * ManagerUpdatesInterval.Ticks);
if (isUnderBudget || lastUsageTimespan <= ResourceLiveTimeout || options.KeepLoaded)
{
targetQuality = StreamingQuality.Maximum;
#if USE_TEST_MANUAL_QUALITY
targetQuality = (testQuality / 100.0f); // apply quality scale for testing
#endif
// TODO: here we should apply resources group master scale (based on game settings quality level and memory level)
}
}
targetQuality.Normalize();
// Calculate target residency level (discrete value)
var currentResidency = resource.CurrentResidency;
var allocatedResidency = resource.AllocatedResidency;
var targetResidency = resource.CalculateTargetResidency(targetQuality);
Debug.Assert(allocatedResidency >= currentResidency && allocatedResidency >= 0, $"allocatedResidency[{allocatedResidency}] >= currentResidency[{currentResidency }] && allocatedResidency[{allocatedResidency }] >= 0");
// Update target residency smoothing
// TODO: use move quality samples and use max or avg value - make that input it smooth - or use PID
//resource.QualitySamples.Add(targetResidency);
//targetResidency = resource.QualitySamples.Maximum();
// Assign last update time
resource.LastUpdate = now;
// Check if a target residency level has been changed
if (targetResidency != resource.TargetResidency)
{
// Register change
resource.TargetResidency = targetResidency;
resource.TargetResidencyChange = now;
}
// Check if need to change resource current residency
if (targetResidency != currentResidency)
{
// Calculate residency level to stream in (resources may want to incease/decrease it's quality in steps rather than at once)
var requestedResidency = resource.CalculateRequestedResidency(targetResidency);
if (options.ForceHighestQuality)
{
requestedResidency = targetResidency;
}
// Create streaming task (resource type specific)
StreamAsync(resource, requestedResidency);
}
}
/// <inheritdoc />
public override int CalculateTargetResidency(StreamingQuality quality)
{
if (MathUtil.IsZero(quality))
{
return(0);
}
var result = Math.Max(1, (int)(TotalMipLevels * quality));
// Compressed formats have aligment restrictions on the dimensions of the texture (minimum size must be 4)
if (Format.IsCompressed() && TotalMipLevels >= 3)
{
result = MathUtil.Clamp(result, 3, TotalMipLevels);
}
return(result);
}
/// <summary> /// Calculates the target residency level for this resource based on a given uniform quality. /// </summary> /// <param name="quality">The quality.</param> /// <returns>Target residency.</returns> public abstract int CalculateTargetResidency(StreamingQuality quality);