/// <summary>
/// Tries to set the visibility of this object on the given view.
/// This method can be used to force rendering on the next frame after adding
/// an object to the scene.
/// </summary>
/// <param name="viewInfo">The view on which to set the visibility.</param>
/// <param name="isVisible">The visibility state to set.</param>
public bool TrySetInitialVisibility(ViewInformation viewInfo, bool isVisible)
{
if (viewInfo.ViewIndex < 0)
{
return(false);
}
VisibilityCheckData checkData = this.GetVisibilityCheckData(viewInfo);
if (checkData.IsVisible)
{
return(true);
}
if ((checkData.IsVisible != isVisible) &&
(checkData.FilterStageData.Count == 0))
{
checkData.IsVisible = isVisible;
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Gets the data object used for visibility checking.
/// </summary>
/// <param name="viewInfo">The VisibilityCheckData for this object for the given view.</param>
internal VisibilityCheckData GetVisibilityCheckData(ViewInformation viewInfo)
{
VisibilityCheckData checkData = m_visibilityData[viewInfo.ViewIndex];
if (checkData == null)
{
checkData = m_visibilityData.AddObject(
new VisibilityCheckData(),
viewInfo.ViewIndex);
}
return(checkData);
}
/// <summary>
/// Is this object visible in the given view?
/// </summary>
/// <param name="viewInfo">The view info to check.</param>
public bool IsVisible(ViewInformation viewInfo)
{
if (viewInfo.ViewIndex < 0)
{
throw new SeeingSharpGraphicsException("Given ViewInformation object is not assoziated to any view!");
}
if (viewInfo.Scene == null)
{
throw new SeeingSharpGraphicsException("Given ViewInformation object is not attached to any scene!");
}
if (viewInfo.Scene != this.Scene)
{
throw new SeeingSharpGraphicsException("Given ViewInformation object is not attached to this scene!");
}
VisibilityCheckData checkData = m_visibilityData[viewInfo.ViewIndex];
if (checkData == null)
{
return(false);
}
return(checkData.IsVisible);
}
/// <summary>
/// Main method for object filtering. This method checks whether an object is visible or not.
/// </summary>
/// <param name="actObject">The object to be tested.</param>
/// <param name="filters">All currently active filters.</param>
/// <param name="refreshStaticObjects">A flag inicating whether we have to update all objects.</param>
private void PerformViewboxCulling(SceneObject actObject, List <SceneObjectFilter> filters, bool refreshStaticObjects)
{
if (!actObject.IsLayerViewSubsetRegistered(this.ViewIndex))
{
return;
}
if (m_invalidObjects.ContainsKey(actObject))
{
return;
}
// Get visiblity check data about current object
VisibilityCheckData checkData = actObject.GetVisibilityCheckData(m_viewInformation);
if (checkData == null)
{
return;
}
// Execute all filters in configured order step by step
int filterCount = filters.Count;
bool previousFilterExecuted = false;
bool previousFilterResult = true;
VisibilityCheckFilterStageData lastFilterStageData = null;
for (int actFilterIndex = 0; actFilterIndex < filterCount; actFilterIndex++)
{
SceneObjectFilter actFilter = filters[actFilterIndex];
// Get data about current filter stage
VisibilityCheckFilterStageData filterStageData = checkData.FilterStageData[actFilterIndex];
if (filterStageData == null)
{
filterStageData = checkData.FilterStageData.AddObject(
new VisibilityCheckFilterStageData(),
actFilterIndex);
}
// Remember last filter stage data
lastFilterStageData = filterStageData;
// Execute filter if needed
if ((!filterStageData.HasExecuted) || // <-- Execute the filter if it was not executed for this object before
(actFilter.ConfigurationChanged) || // <-- Execute the filter if its configuraiton has changed
previousFilterExecuted || // <-- Execute the filter if one of the previous was executed
actFilter.UpdateEachFrame) // <-- Execute the filter if it requests it on each frame (e. g. clipping filter)
{
if (previousFilterResult)
{
// Re-Filter this object because any above condition has passed and
// this object successfully past the previous filter
bool isObjectVisible = actFilter.IsObjectVisible(actObject, m_viewInformation);
filterStageData.HasExecuted = true;
filterStageData.HasPassed = isObjectVisible;
previousFilterResult = isObjectVisible;
previousFilterExecuted = true;
}
else
{
// Set this object to unvisible because previous filter has thrown out
// this object
filterStageData.HasExecuted = true;
filterStageData.HasPassed = false;
}
}
else
{
previousFilterResult = filterStageData.HasPassed;
previousFilterExecuted = false;
}
}
// Handle changed visibility of the object
bool oldVisible = checkData.IsVisible;
bool newVisible = lastFilterStageData != null ? lastFilterStageData.HasPassed : true;
if (oldVisible != newVisible)
{
checkData.IsVisible = newVisible;
m_tmpChangedVisibilities.Add(Tuple.Create(actObject, oldVisible, newVisible));
}
}
