MeshConstruction.h

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/*
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   Copyright (c) 2012 Scientific Computing and Imaging Institute,
   University of Utah.

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/// @todo Documentation Modules/Visualization/MeshConstruction.h

#ifndef MODULES_VISUALIZATION_MESH_CONSTRUCTION_H
#define MODULES_VISUALIZATION_MESH_CONSTRUCTION_H

#include <Core/Datatypes/Geometry.h>
#include <Core/Datatypes/Mesh/VMesh.h>
#include <Core/Datatypes/Mesh/Mesh.h>
#include <Core/Datatypes/Legacy/Field/VMesh.h>
#include <Core/Datatypes/Legacy/Field/Mesh.h>
#include <Core/Datatypes/Legacy/Field/Field.h>
#include <Core/Datatypes/Mesh/MeshFacade.h>

namespace SCIRun {
namespace Modules {
namespace Visualization {

namespace MeshConstruction
{
  /// Constructs faces without normal information. We can share the primary
  /// VBO with the nodes and the edges in this case.
  template <typename VMeshType>
  static void buildFacesNoNormals(typename SCIRun::Core::Datatypes::MeshTraits<VMeshType>::MeshFacadeHandle facade,
                           SCIRun::Core::Datatypes::GeometryHandle geom,
                           const std::string& primaryVBOName,
                           ModuleStateHandle state)
  {
    bool faceTransparency = state->getValue(ShowFieldModule::FaceTransparency).getBool();
    uint32_t* iboFaces = nullptr;

    // Determine the size of the face structure (taking into account the varying
    // types of faces -- only quads and triangles are currently supported).
    size_t iboFacesSize = 0;
    BOOST_FOREACH(const FaceInfo<VMeshType>& face, facade->faces())
    {
      typename VMeshType::Node::array_type nodes = face.nodeIndices();
      if (nodes.size() == 4)
      {
        iboFacesSize += sizeof(uint32_t) * 6;
      }
      else if (nodes.size() == 3)
      {
        iboFacesSize += sizeof(uint32_t) * 3;
      }
      else
      {
        BOOST_THROW_EXCEPTION(SCIRun::Core::DimensionMismatch() 
                              << SCIRun::Core::ErrorMessage("Only Quads and Triangles are supported."));
      }
    }
    std::shared_ptr<std::vector<uint8_t>> rawIBO(new std::vector<uint8_t>());
    rawIBO->resize(iboFacesSize);   // Linear in complexity... If we need more performance,
    // use malloc to generate buffer and then vector::assign.
    iboFaces = reinterpret_cast<uint32_t*>(&(*rawIBO)[0]);
    size_t i = 0;
    BOOST_FOREACH(const FaceInfo<VMeshType>& face, facade->faces())
    {
      typename VMeshType::Node::array_type nodes = face.nodeIndices();
      if (nodes.size() == 4)
      {
        // Winding order looks good from tests.
        iboFaces[i  ] = static_cast<uint32_t>(nodes[0]); iboFaces[i+1] = static_cast<uint32_t>(nodes[1]); iboFaces[i+2] = static_cast<uint32_t>(nodes[2]);
        iboFaces[i+3] = static_cast<uint32_t>(nodes[0]); iboFaces[i+4] = static_cast<uint32_t>(nodes[2]); iboFaces[i+5] = static_cast<uint32_t>(nodes[3]);
        i += 6;
      }
      else if (nodes.size() == 3)
      {
        iboFaces[i  ] = static_cast<uint32_t>(nodes[0]); iboFaces[i+1] = static_cast<uint32_t>(nodes[1]); iboFaces[i+2] = static_cast<uint32_t>(nodes[2]);
        i += 3;
      }
      // All other cases have been checked in the loop above which determines
      // the size of the face IBO.
    }

    // Add IBO for the faces.
    std::string facesIBOName = "facesIBO";
    geom->mIBOs.emplace_back(GeometryObject::SpireIBO(facesIBOName, sizeof(uint32_t), rawIBO));

    // Build pass for the faces.
    /// \todo Find an appropriate place to put program names like UniformColor.
    GeometryObject::SpireSubPass pass = 
        GeometryObject::SpireSubPass("facesPass", primaryVBOName,
                                  facesIBOName, "UniformColor",
                                  Spire::StuInterface::TRIANGLES);
    if (faceTransparency)
      pass.addUniform("uColor", Spire::V4(1.0f, 1.0f, 1.0f, 0.2f));
    else
      pass.addUniform("uColor", Spire::V4(1.0f, 1.0f, 1.0f, 1.0f));

    geom->mPasses.emplace_back(pass);
  }

  /// Constructs edges without normal information. We can share the primary
  /// VBO with faces and nodes.
  template <typename VMeshType>
  void buildEdgesNoNormals(typename SCIRun::Core::Datatypes::MeshTraits<VMeshType>::MeshFacadeHandle facade,
                           SCIRun::Core::Datatypes::GeometryHandle geom,
                           const std::string& primaryVBOName,
                           ModuleStateHandle state);

  /// Constructs nodes without normal information. We can share the primary
  /// VBO with edges and faces.
  template <typename VMeshType>
  void buildNodesNoNormals(typename SCIRun::Core::Datatypes::MeshTraits<VMeshType>::MeshFacadeHandle facade,
                           SCIRun::Core::Datatypes::GeometryHandle geom,
                           const std::string& primaryVBOName,
                           ModuleStateHandle state);
};

}}}

#endif