Provided by: libdrawtk-dev_1.0b-1_amd64 bug


       dtk_update_screen, dtk_clear_screen, dtk_bgcolor - screen buffer manipulation


       #include <drawtk.h>

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


       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.


       These functions return no value.