NAME

       dtk_update_screen, dtk_clear_screen, dtk_bgcolor - screen buffer manipulation

SYNOPSIS

       #include <drawtk.h>

       void dtk_update_screen(dtk_hwnd wnd);
       void dtk_clear_screen(dtk_hwnd wnd);
       void dtk_bgcolor(float *bgcolor);

DESCRIPTION

       dtk_bgcolor()  set bgcolor as the background color of the current rendering context. bgcolor should point
       to an array of 4 float corresponding to an normalized RGBA value. If unspecified, the background color is
       black.

       dtk_clear_screen() fills the frame buffer with the background color of the window wnd.

       dtk_update_screen() swaps the front and back frame buffers of the  window  wnd.  Rendering  is  performed
       through  double  buffering,  i.e.  the  draws  are rendered on the back buffer which will be displayed on
       screen when a call to dtk_update_screen() will be performed. After an update, the  content  of  the  back
       buffer  is  undefined.  So  if the rendered scene does not rewrite the whole frame buffer, it is safer to
       call dtk_clear_screen() after an update of the screen.

RETURN VALUE

       These functions return no value.

SEE ALSO

EPFL                                                  2010                                  DTK_UPDATE_SCREEN(3)