vtk-m/vtkm/rendering/MapperRayTracer.cxx

//============================================================================
//  Copyright (c) Kitware, Inc.
//  All rights reserved.
//  See LICENSE.txt 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.
//
//  Copyright 2016 Sandia Corporation.
//  Copyright 2016 UT-Battelle, LLC.
//  Copyright 2016 Los Alamos National Security.
//
//  Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
//  the U.S. Government retains certain rights in this software.
//
//  Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
//  Laboratory (LANL), the U.S. Government retains certain rights in
//  this software.
//============================================================================

#include <vtkm/rendering/MapperRayTracer.h>

#include <vtkm/cont/TryExecute.h>
#include <vtkm/cont/internal/SimplePolymorphicContainer.h>

#include <vtkm/rendering/CanvasRayTracer.h>
#include <vtkm/rendering/internal/RunTriangulator.h>
#include <vtkm/rendering/raytracing/Camera.h>
#include <vtkm/rendering/raytracing/RayTracer.h>

namespace vtkm
{
namespace rendering
{

struct MapperRayTracer::InternalsType
{
  vtkm::rendering::CanvasRayTracer* Canvas;
  std::shared_ptr<vtkm::cont::internal::SimplePolymorphicContainerBase> RayTracerContainer;

  VTKM_CONT
  InternalsType()
    : Canvas(nullptr)
  {
  }

  template <typename Device>
  VTKM_CONT vtkm::rendering::raytracing::RayTracer<Device>* GetRayTracer(Device)
  {
    VTKM_IS_DEVICE_ADAPTER_TAG(Device);

    typedef vtkm::rendering::raytracing::RayTracer<Device> RayTracerType;
    typedef vtkm::cont::internal::SimplePolymorphicContainer<RayTracerType> ContainerType;
    RayTracerType* tracer = nullptr;
    if (this->RayTracerContainer)
    {
      ContainerType* container = dynamic_cast<ContainerType*>(this->RayTracerContainer.get());
      if (container)
      {
        tracer = &container->Item;
      }
    }

    if (tracer == nullptr)
    {
      ContainerType* container =
        new vtkm::cont::internal::SimplePolymorphicContainer<RayTracerType>;
      tracer = &container->Item;
      this->RayTracerContainer.reset(container);
    }

    return tracer;
  }
};

MapperRayTracer::MapperRayTracer()
  : Internals(new InternalsType)
{
}

MapperRayTracer::~MapperRayTracer()
{
}

void MapperRayTracer::SetCanvas(vtkm::rendering::Canvas* canvas)
{
  if (canvas != nullptr)
  {
    this->Internals->Canvas = dynamic_cast<CanvasRayTracer*>(canvas);
    if (this->Internals->Canvas == nullptr)
    {
      throw vtkm::cont::ErrorBadValue("Ray Tracer: bad canvas type. Must be CanvasRayTracer");
    }
  }
  else
  {
    this->Internals->Canvas = nullptr;
  }
}

vtkm::rendering::Canvas* MapperRayTracer::GetCanvas() const
{
  return this->Internals->Canvas;
}

struct MapperRayTracer::RenderFunctor
{
  vtkm::rendering::MapperRayTracer* Self;
  vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>> TriangleIndices;
  vtkm::Id NumberOfTriangles;
  vtkm::cont::CoordinateSystem Coordinates;
  vtkm::cont::Field ScalarField;
  vtkm::rendering::Camera Camera;
  vtkm::Range ScalarRange;

  VTKM_CONT
  RenderFunctor(vtkm::rendering::MapperRayTracer* self,
                const vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>>& indices,
                vtkm::Id numberOfTriangles,
                const vtkm::cont::CoordinateSystem& coordinates,
                const vtkm::cont::Field& scalarField,
                const vtkm::rendering::Camera& camera,
                const vtkm::Range& scalarRange)
    : Self(self)
    , TriangleIndices(indices)
    , NumberOfTriangles(numberOfTriangles)
    , Coordinates(coordinates)
    , ScalarField(scalarField)
    , Camera(camera)
    , ScalarRange(scalarRange)
  {
  }

  template <typename Device>
  bool operator()(Device)
  {
    VTKM_IS_DEVICE_ADAPTER_TAG(Device);

    vtkm::rendering::raytracing::RayTracer<Device>* tracer =
      this->Self->Internals->GetRayTracer(Device());

    tracer->GetCamera().SetParameters(this->Camera, *this->Self->Internals->Canvas);

    vtkm::Bounds dataBounds = this->Coordinates.GetBounds();

    tracer->SetData(this->Coordinates.GetData(),
                    this->TriangleIndices,
                    this->ScalarField,
                    this->NumberOfTriangles,
                    this->ScalarRange,
                    dataBounds);
    tracer->SetColorMap(this->Self->ColorMap);
    tracer->SetBackgroundColor(this->Self->Internals->Canvas->GetBackgroundColor().Components);
    tracer->Render(this->Self->Internals->Canvas);

    return true;
  }
};

void MapperRayTracer::RenderCells(const vtkm::cont::DynamicCellSet& cellset,
                                  const vtkm::cont::CoordinateSystem& coords,
                                  const vtkm::cont::Field& scalarField,
                                  const vtkm::rendering::ColorTable& vtkmNotUsed(colorTable),
                                  const vtkm::rendering::Camera& camera,
                                  const vtkm::Range& scalarRange)
{
  vtkm::cont::ArrayHandle<vtkm::Vec<vtkm::Id, 4>> indices;
  vtkm::Id numberOfTriangles;
  vtkm::rendering::internal::RunTriangulator(cellset, indices, numberOfTriangles);

  RenderFunctor functor(this, indices, numberOfTriangles, coords, scalarField, camera, scalarRange);
  vtkm::cont::TryExecute(functor);
}

void MapperRayTracer::StartScene()
{
  // Nothing needs to be done.
}

void MapperRayTracer::EndScene()
{
  // Nothing needs to be done.
}

vtkm::rendering::Mapper* MapperRayTracer::NewCopy() const
{
  return new vtkm::rendering::MapperRayTracer(*this);
}
}
} // vtkm::rendering