/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkCompositeRenderManager.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#include "vtkCompositeRenderManager.h"

#include "vtkCompressCompositer.h"
#include "vtkFloatArray.h"
#include "vtkMultiProcessController.h"
#include "vtkObjectFactory.h"
#include "vtkRenderWindow.h"
#include "vtkRenderer.h"
#include "vtkTimerLog.h"
#include "vtkUnsignedCharArray.h"

vtkStandardNewMacro(vtkCompositeRenderManager);

vtkCxxSetObjectMacro(vtkCompositeRenderManager, Compositer, vtkCompositer);

//------------------------------------------------------------------------------
vtkCompositeRenderManager::vtkCompositeRenderManager()
{
  this->Compositer = vtkCompressCompositer::New();
  this->Compositer->Register(this);
  this->Compositer->Delete();

  this->DepthData = vtkFloatArray::New();
  this->TmpPixelData = vtkUnsignedCharArray::New();
  this->TmpDepthData = vtkFloatArray::New();

  this->DepthData->SetNumberOfComponents(1);
  this->TmpPixelData->SetNumberOfComponents(4);
  this->TmpDepthData->SetNumberOfComponents(1);
}

//------------------------------------------------------------------------------
vtkCompositeRenderManager::~vtkCompositeRenderManager()
{
  this->SetCompositer(nullptr);
  this->DepthData->Delete();
  this->TmpPixelData->Delete();
  this->TmpDepthData->Delete();
}

//------------------------------------------------------------------------------
void vtkCompositeRenderManager::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os, indent);
  os << indent << "Compositer: " << endl;
  this->Compositer->PrintSelf(os, indent.GetNextIndent());
}

//------------------------------------------------------------------------------
void vtkCompositeRenderManager::PreRenderProcessing()
{
  vtkTimerLog::MarkStartEvent("Compositing");
  // Turn swap buffers off before the render so the end render method has a
  // chance to add to the back buffer.
  if (this->UseBackBuffer)
  {
    this->RenderWindow->SwapBuffersOff();
  }

  this->SavedMultiSamplesSetting = this->RenderWindow->GetMultiSamples();
  this->RenderWindow->SetMultiSamples(0);
}

//------------------------------------------------------------------------------
void vtkCompositeRenderManager::PostRenderProcessing()
{
  this->RenderWindow->SetMultiSamples(this->SavedMultiSamplesSetting);

  if (!this->UseCompositing || this->CheckForAbortComposite())
  {
    vtkTimerLog::MarkEndEvent("Compositing");
    return;
  }

  if (this->Controller->GetNumberOfProcesses() > 1)
  {
    // Read in data.
    this->ReadReducedImage();
    this->Timer->StartTimer();
    this->RenderWindow->GetZbufferData(
      0, 0, this->ReducedImageSize[0] - 1, this->ReducedImageSize[1] - 1, this->DepthData);

    // Set up temporary buffers.
    this->TmpPixelData->SetNumberOfComponents(this->ReducedImage->GetNumberOfComponents());
    this->TmpPixelData->SetNumberOfTuples(this->ReducedImage->GetNumberOfTuples());
    this->TmpDepthData->SetNumberOfComponents(this->DepthData->GetNumberOfComponents());
    this->TmpDepthData->SetNumberOfTuples(this->DepthData->GetNumberOfTuples());

    // Do composite
    this->Compositer->SetController(this->Controller);
    this->Compositer->CompositeBuffer(
      this->ReducedImage, this->DepthData, this->TmpPixelData, this->TmpDepthData);

    this->Timer->StopTimer();
    this->ImageProcessingTime = this->Timer->GetElapsedTime();
  }

  this->WriteFullImage();

  // Swap buffers here
  if (this->UseBackBuffer)
  {
    this->RenderWindow->SwapBuffersOn();
  }
  this->RenderWindow->Frame();

  vtkTimerLog::MarkEndEvent("Compositing");
}
