/// <summary>
///
/// </summary>
/// <param name="context"></param>
/// <param name="deviceContext"></param>
protected override void OnUpdate(RenderContext context, DeviceContextProxy deviceContext)
{
UpdateTime(context, ref totalElapsed);
//Set correct instance count from instance buffer
drawArgument.InstanceCount = InstanceBuffer == null || !InstanceBuffer.HasElements ? 1 : (uint)InstanceBuffer.Buffer.ElementCount;
//Upload the draw argument
particleCountGSIABuffer.UploadDataToBuffer(deviceContext, ref drawArgument);
updatePass.BindShader(deviceContext);
updatePass.ComputeShader.BindUAV(deviceContext, currentStateSlot, BufferProxies[0]);
updatePass.ComputeShader.BindUAV(deviceContext, newStateSlot, BufferProxies[1]);
if (isRestart)
{
FrameVariables.NumParticles = 0;
perFrameCB.UploadDataToBuffer(deviceContext, ref FrameVariables);
// Call ComputeShader to add initial particles
deviceContext.Dispatch(1, 1, 1);
isRestart = false;
}
else
{
#region Get consume buffer count
// Get consume buffer count.
//Due to some intel integrated graphic card having issue copy structure count directly into constant buffer.
//Has to use staging buffer to read and pass into constant buffer
FrameVariables.NumParticles = (uint)ReadCount("", deviceContext, BufferProxies[0]);
perFrameCB.UploadDataToBuffer(deviceContext, ref FrameVariables);
#endregion
deviceContext.Dispatch(Math.Max(1, (int)Math.Ceiling((double)FrameVariables.NumParticles / 512)), 1, 1);
// Get append buffer count
BufferProxies[1].CopyCount(deviceContext, particleCountGSIABuffer.Buffer, 0);
}
#if OUTPUTDEBUGGING
ReadCount("UAV 0", deviceContext, BufferProxies[0].UAV);
#endif
if (totalElapsed > InsertElapseThrottle)
{
insertCB.UploadDataToBuffer(deviceContext, ref InsertVariables);
// Add more particles
insertPass.BindShader(deviceContext);
insertPass.ComputeShader.BindUAV(deviceContext, newStateSlot, BufferProxies[1]);
deviceContext.Dispatch(1, 1, 1);
totalElapsed = 0;
#if OUTPUTDEBUGGING
ReadCount("UAV 1", deviceContext, BufferProxies[1].UAV);
#endif
}
// Swap UAV buffers for next frame
var bproxy = BufferProxies[0];
BufferProxies[0] = BufferProxies[1];
BufferProxies[1] = bproxy;
}
