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