public override void Draw(RenderDrawContext context, RenderView renderView, RenderViewStage renderViewStage, int startIndex, int endIndex)
{
// Do not call into VL if not running
var renderContext = context.RenderContext;
var runtime = this.runtime ?? (this.runtime = renderContext.Services.GetService <IVLRuntime>());
if (runtime != null && !runtime.IsRunning)
{
return;
}
// Build the list of layers to render
singleCallLayers.Clear();
layers.Clear();
for (var index = startIndex; index < endIndex; index++)
{
var renderNodeReference = renderViewStage.SortedRenderNodes[index].RenderNode;
var renderNode = GetRenderNode(renderNodeReference);
var renderElement = (RenderDrawEffect)renderNode.RenderObject;
if (renderElement.Enabled)
{
if (renderElement.SingleCallPerFrame)
{
singleCallLayers.Add(renderElement.Layer);
}
else
{
layers.Add(renderElement.Layer);
}
}
}
// Tell VL that we're calling into it - ensures that no hotswap will be happening
RuntimeGraph.Enter(this);
try
{
// Call layers which want to get invoked only once per frame first
var currentFrameNr = renderContext.Time.FrameCount;
if (lastFrameNr != currentFrameNr)
{
lastFrameNr = currentFrameNr;
foreach (var layer in singleCallLayers)
{
try
{
layer?.Draw(Context, context, renderView, renderViewStage, context.CommandList);
}
catch (Exception e)
{
RuntimeGraph.ReportException(e);
}
}
}
// Call layers which can get invoked twice per frame (for each eye)
foreach (var layer in layers)
{
try
{
layer?.Draw(Context, context, renderView, renderViewStage, context.CommandList);
}
catch (Exception e)
{
RuntimeGraph.ReportException(e);
}
}
}
finally
{
RuntimeGraph.Exit(this);
}
}