glRenderWindow.h

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// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//

#ifndef BALL_VIEW_RENDERING_GLRENDERWINDOW_H
#define BALL_VIEW_RENDERING_GLRENDERWINDOW_H

#ifndef BALL_COMMON_GLOBAL_H
# include <BALL/COMMON/global.h>
#endif

#ifndef BALL_DATATYPE_STRING_H
# include <BALL/DATATYPE/string.h>
#endif

#ifndef BALL_VIEW_RENDERING_RENDERWINDOW_H
# include <BALL/VIEW/RENDERING/renderWindow.h>
#endif

#ifndef BALL_VIEW_DATATYPE_COLORRGBA_H
# include <BALL/VIEW/DATATYPE/colorRGBA.h>
#endif

#ifndef BALL_SYSTEM_MUTEX_H
# include <BALL/SYSTEM/mutex.h>
#endif

#include <QtOpenGL/qgl.h>

namespace BALL
{
  namespace VIEW
  {       
    class BALL_VIEW_EXPORT GLRenderWindow 
      : public RenderWindow<float>,
        public QGLWidget
    {
      
    public:
      GLRenderWindow();
      GLRenderWindow(QWidget* parent_widget, const char* name = NULL, Qt::WFlags w_flags = 0);
      GLRenderWindow(const GLRenderWindow& window, QWidget* parent_widget, const char* name = NULL, Qt::WFlags w_flags = 0);

      virtual ~GLRenderWindow();

      /* RenderWindow methods */
      virtual bool init();
      virtual bool resize(const unsigned int width, const unsigned int height);
      virtual void refresh();     

      // render the given text in the given color and size at window coordinates (x, y)
      virtual void renderText(int x, int y, const String& text, const ColorRGBA& color, Size size = 16);
      // render the given text in the given color and size at world coordinates (x, y, z)
      virtual void renderText(float x, float y, float z, const String& text, const ColorRGBA& color, Size size = 16);

      void lockGLContext();

      void unlockGLContext();

      void ignoreEvents(bool ignore) {ignore_events_ = ignore;}

    protected:  
      void paintEvent(QPaintEvent* e);
      static QGLFormat gl_format_;

      // ID of the fullscreen texture used to paste image into GPU framebuffer            
      GLuint m_screenTexID;
      // type of the texture used
      GLenum FB_TEXTURE_TARGET;
      // format of the GL texture (GL_RGB, GL_RGBA, etc.)
      GLenum FB_TEXTURE_FORMAT;
      // internal format specified when creating the textures
      GLenum FB_INTERNAL_TEXTURE_FORMAT;
      // data type of the GL texture (GL_FLOAT, GL_UNSIGNED_INT, etc.)
      GLenum FB_TEXTURE_DATATYPE;
          
      void createTexture(const unsigned int winWidth, const unsigned int winHeight);  
      void deleteTexture();

      void checkGL();

      bool errorInGL(GLenum& error);
      String getGLErrorString(GLenum error);

      mutable Mutex contex_mutex_;
      bool ignore_events_;

      bool is_buffered_;
    };

  } // namespace VIEW

} // namespace BALL

#endif // BALL_VIEW_RENDERING_GLRENDERWINDOW_H