Method DrawPoly

Rendering/ContextOpenGL2/vtkOpenGLContextDevice3D.cxx:270–335

}

void vtkOpenGLContextDevice3D::DrawPoly(
  const float* verts, int n, const unsigned char* colors, int nc)
{
  assert("verts must be non-null" && verts != nullptr);
  assert("n must be greater than 0" && n > 0);

  if (this->Pen->GetLineType() == vtkPen::NO_PEN)
  {
    return;
  }

  vtkOpenGLClearErrorMacro();

  this->EnableDepthBuffer();

  this->Storage->SetLineType(this->Pen->GetLineType());

  vtkOpenGLHelper* cbo = nullptr;
  if (colors)
  {
    this->ReadyVCBOProgram();
    cbo = this->VCBO;
    if (!cbo->Program)
    {
      return;
    }
  }
  else
  {
    this->ReadyVBOProgram();
    cbo = this->VBO;
    if (!cbo->Program)
    {
      return;
    }
    if (this->HaveWideLines())
    {
      vtkWarningMacro(
        << "a line width has been requested that is larger than your system supports");
    }
    else
    {
      this->RenderWindow->GetState()->vtkglLineWidth(this->Pen->GetWidth());
    }
    cbo->Program->SetUniform4uc("vertexColor", this->Pen->GetColor());
  }

  this->BuildVBO(cbo, verts, n, colors, nc, nullptr);
  this->SetMatrices(cbo->Program);

  auto timer = this->RenderWindow->GetRenderTimer();
  VTK_SCOPED_RENDER_EVENT(this->GetClassNameInternal()
      << "::" << __func__ << "|glDrawArrays(cacheIdentifier: "
      << "null"
      << ",mode:GL_LINE_STRIP,n:" << n,
    timer);
  glDrawArrays(GL_LINE_STRIP, 0, n);