public bool TryHostConditionalRendering(ICounterEvent value, ulong compare, bool isEqual)
{
if (value is CounterQueueEvent)
{
// Compare an event and a constant value.
CounterQueueEvent evt = (CounterQueueEvent)value;
// Easy host conditional rendering when the check matches what GL can do:
// - Event is of type samples passed.
// - Result is not a combination of multiple queries.
// - Comparing against 0.
// - Event has not already been flushed.
if (evt.Disposed)
{
// If the event has been flushed, then just use the values on the CPU.
// The query object may already be repurposed for another draw (eg. begin + end).
return(false);
}
if (compare == 0 && evt.Type == QueryTarget.SamplesPassed && evt.ClearCounter)
{
GL.BeginConditionalRender(evt.Query, isEqual ? ConditionalRenderType.QueryNoWaitInverted : ConditionalRenderType.QueryNoWait);
return(true);
}
}
// The GPU will flush the queries to CPU and evaluate the condition there instead.
GL.Flush(); // The thread will be stalled manually flushing the counter, so flush GL commands now.
return(false);
}
public void beginConditionalRender()
{
GL.BeginConditionalRender(_index, ConditionalRenderType.QueryByRegionWait);
}
/// <summary> Begin a conditional section conditioned on the result of this query
/// Use GLOperationEndConditionalRender to finish the condition section.</summary>
public void BeginConditional(ConditionalRenderType mode)
{
GL.BeginConditionalRender(Query.Id, mode);
}
/// <summary> Called by render list and executes the operation </summary>
public override void Execute(GLMatrixCalc c)
{
GL.BeginConditionalRender(id, mode);
}
