PointNode.cc

/*===========================================================================*\
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//=============================================================================
//
//  CLASS PointNode - IMPLEMENTATION
//
//=============================================================================
 
//== INCLUDES =================================================================
 
#include <ACG/GL/acg_glew.hh>
#include "PointNode.hh"
#include <ACG/GL/IRenderer.hh>
 
//== NAMESPACES ===============================================================
 
namespace ACG {
namespace SceneGraph {
 
 
//== IMPLEMENTATION ========================================================== 
 
 
void
PointNode::
boundingBox(Vec3d& _bbMin, Vec3d& _bbMax)
{
  ConstPointIter p_it=points_.begin(), p_end=points_.end();
  for (; p_it!=p_end; ++p_it) {
    _bbMin.minimize(*p_it); 
    _bbMax.maximize(*p_it);
  }
}
 
 
//----------------------------------------------------------------------------
 
  
DrawModes::DrawMode
PointNode::
availableDrawModes() const
{
  return ( DrawModes::POINTS | 
           DrawModes::POINTS_SHADED | 
           DrawModes::POINTS_COLORED );
}
 
 
//----------------------------------------------------------------------------
 
 
void
PointNode::
draw(GLState& /* _state */ , const DrawModes::DrawMode& _drawMode)
{
  if (points_.empty())
    return;
  
  // points
  if (_drawMode & DrawModes::POINTS)
  {
    ACG::GLState::disable(GL_LIGHTING);
    ACG::GLState::enableClientState(GL_VERTEX_ARRAY);
    ACG::GLState::vertexPointer(&points_[0]);
    glDrawArrays(GL_POINTS, 0, int(points_.size()));
  }
 
 
  // points and normals
  if (_drawMode & DrawModes::POINTS_SHADED)
  {
    if (points_.size() == normals_.size())
    {
      ACG::GLState::enable(GL_LIGHTING);
      ACG::GLState::enableClientState(GL_VERTEX_ARRAY);
      ACG::GLState::vertexPointer(&points_[0]);
      ACG::GLState::enableClientState(GL_NORMAL_ARRAY);
      ACG::GLState::normalPointer(&normals_[0]);
      glDrawArrays(GL_POINTS, 0, int(points_.size()));
    }
  }
 
 
  // points and colors
  if (_drawMode & DrawModes::POINTS_COLORED)
  {
    if (points_.size() == colors_.size())
    {
      ACG::GLState::disable(GL_LIGHTING);
      ACG::GLState::enableClientState(GL_VERTEX_ARRAY);
      ACG::GLState::vertexPointer(&points_[0]);
      ACG::GLState::enableClientState(GL_COLOR_ARRAY);
      ACG::GLState::colorPointer(&colors_[0]);
      glDrawArrays(GL_POINTS, 0, int(points_.size()));
    } else
      std::cerr << "Mismatch size!" << std::endl;
  }
 
 
  // disable arrays
  ACG::GLState::disableClientState(GL_VERTEX_ARRAY);
  ACG::GLState::disableClientState(GL_NORMAL_ARRAY);
  ACG::GLState::disableClientState(GL_COLOR_ARRAY);
}
 
void
PointNode::
update_vbo()
{
  if (!vbo_needs_update_)
    return;
 
  if (vbo_ == 0) {
    glGenBuffers(1, &vbo_);
  }
 
  vertexDecl_.clear();
 
  vertexDecl_.addElement(GL_FLOAT, 3, VERTEX_USAGE_POSITION);
  // number of floats per point
  size_t elem_size = 3;
  if (!normals_.empty())
  {
    assert(normals_.size() == points_.size());
    vertexDecl_.addElement(GL_FLOAT, 3, VERTEX_USAGE_NORMAL, elem_size*sizeof(float));
    elem_size += 3;
  }
  if (!colors_.empty())
  {
    assert(colors_.size() == points_.size());
    vertexDecl_.addElement(GL_FLOAT, 4, VERTEX_USAGE_COLOR, elem_size*sizeof(float));
    elem_size += 4;
  }
  vertexDecl_.setVertexStride(elem_size * sizeof(float));
 
  vbo_data_.clear();
  vbo_data_.reserve(elem_size * points_.size());
 
  for (size_t i=0; i < points_.size(); ++i) {
    vbo_data_.push_back(static_cast<float>(points_[i][0]));
    vbo_data_.push_back(static_cast<float>(points_[i][1]));
    vbo_data_.push_back(static_cast<float>(points_[i][2]));
    if (!normals_.empty()) {
      vbo_data_.push_back(static_cast<float>(normals_[i][0]));
      vbo_data_.push_back(static_cast<float>(normals_[i][1]));
      vbo_data_.push_back(static_cast<float>(normals_[i][2]));
    }
    if (!colors_.empty()) {
      vbo_data_.push_back(colors_[i][0]);
      vbo_data_.push_back(colors_[i][1]);
      vbo_data_.push_back(colors_[i][2]);
      vbo_data_.push_back(colors_[i][3]);
    }
  }
  assert(vbo_data_.size() == points_.size() * elem_size);
 
  glBindBuffer(GL_ARRAY_BUFFER, vbo_);
  glBufferData(GL_ARRAY_BUFFER, vbo_data_.size()*sizeof(float) , vbo_data_.data() , GL_STATIC_DRAW);
  glBindBuffer(GL_ARRAY_BUFFER, 0);
  vbo_needs_update_ = false;
}
 
void
PointNode::
getRenderObjects( IRenderer* _renderer, GLState& _state , const DrawModes::DrawMode& _drawMode , const Material* _mat )
{
  if (points_.empty())
    return;
 
  update_vbo();
 
  RenderObject ro;
  ro.debugName = "PointNode";
 
  ro.vertexDecl = &vertexDecl_;
  ro.vertexBuffer = vbo_;
 
  for (unsigned int i = 0; i < _drawMode.getNumLayers(); ++i)
  {
    const DrawModes::DrawModeProperties* props = _drawMode.getLayer(i);
 
    if (props->primitive() == DrawModes::PRIMITIVE_POINT)
    {
      // reset renderobject
      ro.initFromState(&_state);
      ro.setMaterial(_mat);
      ro.setupShaderGenFromDrawmode(props);
 
      ro.priority = 0;
      ro.depthTest = true;
      ro.depthWrite = true;
      ro.depthFunc = GL_LESS;
 
      // use pointsize shader
      QString geomTemplate = ShaderProgGenerator::getShaderDir();
      geomTemplate += "PointSize/geometry.tpl";
 
      QString fragTemplate = ShaderProgGenerator::getShaderDir();
      fragTemplate += "PointSize/fragment.tpl";
 
      ro.shaderDesc.geometryTemplateFile = geomTemplate;
      ro.shaderDesc.fragmentTemplateFile = fragTemplate;
 
      // shader uniforms
      ro.setUniform("screenSize", Vec2f((float)_state.viewport_width(), (float)_state.viewport_height()));
      ro.setUniform("pointSize", _mat->pointSize());
 
      ro.glDrawArrays(GL_POINTS, 0, (GLsizei)points_.size());
      _renderer->addRenderObject(&ro);
    }
  }
}
 
 
//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================