qt_ogre_render_window.cpp

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#include "qt_ogre_render_window.h"
#include "orthographic.h"
#include "render_system.h"

#include <OGRE/OgreRoot.h>
#include <OGRE/OgreViewport.h>
#include <OGRE/OgreCamera.h>
#include <OGRE/OgreRenderWindow.h>
#include <OGRE/OgreStringConverter.h>
#include <OGRE/OgreGpuProgramManager.h>

#include <ros/console.h>
#include <ros/assert.h>

#if OGRE_PLATFORM == OGRE_PLATFORM_LINUX
#include <stdlib.h>
#endif

namespace ogre_tools
{

QtOgreRenderWindow::QtOgreRenderWindow( RenderSystem* render_system, QWidget* parent )
  : RenderWidget( render_system, parent )
  , viewport_( 0 )
  , ogre_root_( render_system_->root() )
  , ortho_scale_( 1.0f )
  , auto_render_( true )
  , camera_( 0 )
  , overlays_enabled_( true ) // matches the default of Ogre::Viewport.
  , background_color_( Ogre::ColourValue::Black ) // matches the default of Ogre::Viewport.
{
}

//------------------------------------------------------------------------------
Ogre::Viewport* QtOgreRenderWindow::getViewport () const
{
  assert( viewport_ );
  return viewport_;
}

void QtOgreRenderWindow::setCamera( Ogre::Camera* camera )
{
  camera_ = camera;
  if( viewport_ )
  {
    viewport_->setCamera( camera );
  }

  setCameraAspectRatio();

  update();
}

void QtOgreRenderWindow::setOverlaysEnabled( bool overlays_enabled )
{
  overlays_enabled_ = overlays_enabled;
  if( viewport_ )
  {
    viewport_->setOverlaysEnabled( overlays_enabled );
  }
}

void QtOgreRenderWindow::setBackgroundColor( Ogre::ColourValue background_color )
{
  background_color_ = background_color;
  if( viewport_ )
  {
    viewport_->setBackgroundColour( background_color );
  }
}

void QtOgreRenderWindow::setCameraAspectRatio()
{
  if ( camera_ )
  {
    camera_->setAspectRatio( Ogre::Real( width() ) / Ogre::Real( height() ) );

    if ( camera_->getProjectionType() == Ogre::PT_ORTHOGRAPHIC )
    {
      Ogre::Matrix4 proj;
      buildScaledOrthoMatrix( proj,
                              -width() / ortho_scale_ / 2, width() / ortho_scale_ / 2,
                              -height() / ortho_scale_ / 2, height() / ortho_scale_ / 2,
                              camera_->getNearClipDistance(), camera_->getFarClipDistance() );
      camera_->setCustomProjectionMatrix(true, proj);
    }
  }
}

void QtOgreRenderWindow::setOrthoScale( float scale )
{
  ortho_scale_ = scale;

  setCameraAspectRatio();
}

void QtOgreRenderWindow::setPreRenderCallback( boost::function<void ()> func )
{
  pre_render_callback_ = func;
}

void QtOgreRenderWindow::setPostRenderCallback( boost::function<void ()> func )
{
  post_render_callback_ = func;
}

//------------------------------------------------------------------------------
void QtOgreRenderWindow::paintEvent( QPaintEvent* e )
{
  if( auto_render_ && render_window_ )
  {
    if( pre_render_callback_ )
    {
      pre_render_callback_();
    }

    if( ogre_root_->_fireFrameStarted() )
    {
#if (OGRE_VERSION_MAJOR >= 1 && OGRE_VERSION_MINOR >= 6)
      ogre_root_->_fireFrameRenderingQueued();
#endif

      render_window_->update();

      ogre_root_->_fireFrameEnded();
    }

    if ( post_render_callback_ )
    {
      post_render_callback_();
    }
  }
}

//------------------------------------------------------------------------------
void QtOgreRenderWindow::resizeEvent( QResizeEvent* event )
{
  RenderWidget::resizeEvent( event );

  if( render_window_ )
  {
    setCameraAspectRatio();

    if( auto_render_ )
    {
      update();
    }
  }
}

void QtOgreRenderWindow::showEvent( QShowEvent *event )
{
  RenderWidget::showEvent( event );

  render_window_->setVisible(true);
  render_window_->setAutoUpdated(true);

  viewport_ = render_window_->addViewport( camera_ );
  viewport_->setOverlaysEnabled( overlays_enabled_ );
  viewport_->setBackgroundColour( background_color_ );

  setCameraAspectRatio();
}

//
// bool QtOgreRenderWindow::Reparent(wxWindowBase* new_parent)
// {
//   // Dear god I hate GTK.  Because gtk_widget_reparent() does not work properly (https://netfiles.uiuc.edu/rvmorale/www/gtk-faq-es/x639.html),
//   // When a window is reparented in wx the drawable client area has to be destroyed and re-created, causing its XID to change.  This causes both:
//   // 1) Any window that was its child (like the Ogre render window's) is destroyed
//   // 2) The XID changes
//   // The following seems to be the only thing that actually works when trying to work around this:
//   // 1) Reparent the render window's window to the root window
//   // 2) Allow wx to reparent the window
//   // 3) Reparent the render window's window to the new parent window
// #if defined(__WXGTK__)
//   Window win;
//   Display* disp;
// 
//   if (render_window_)
//   {
//     render_window_->getCustomAttribute("WINDOW", &win);
//     render_window_->getCustomAttribute("XDISPLAY", &disp);
// 
//     wxWindow* top = wxTheApp->GetTopWindow();
//     GtkPizza* pizza = GTK_PIZZA(top->m_wxwindow);
//     Window parent = GDK_WINDOW_XWINDOW(pizza->bin_window);
// 
//     XSync(disp, False);
//     XReparentWindow(disp, win, parent, 0, 0);
//     XSync(disp, False);
//   }
// #endif
// 
//   bool ret = wxControl::Reparent(new_parent);
// 
// #if defined(__WXGTK__)
//   if (render_window_)
//   {
//     XSync(disp, False);
// 
//     gtk_widget_set_double_buffered(m_wxwindow, FALSE);
//     if (!GTK_WIDGET_REALIZED(m_wxwindow))
//     {
//       gtk_widget_realize(m_wxwindow);
//     }
// 
//     GtkPizza* pizza = GTK_PIZZA(m_wxwindow);
// 
//     XSync(GDK_WINDOW_XDISPLAY(m_wxwindow->window), False);
//     XSync(GDK_WINDOW_XDISPLAY(pizza->bin_window), False);
// 
//     GdkWindow* gdkWin = pizza->bin_window;
//     Window parent = GDK_WINDOW_XWINDOW(gdkWin);
//     XReparentWindow(disp, win, parent, 0, 0);
// 
// //    XSync(disp, False);
// 
//     XMapWindow(disp, win);
// 
//     XSync(disp, False);
//   }
// #endif
// 
//   return ret;
// }

} // namespace ogre_tools