rem Display Showcase
bitsperpixel=screen depth()/8

rem Standard Setup Code for all examples
sync on : sync rate 0
set text font "arial" : set text size 16
set text to bold : set text transparent

rem Load nice backdrop
load bitmap "backdrop.jpg"

rem Main loop
desc$="Direct Display Access"
do

rem Draw to the visual bitmap
ink rgb(0,0,0),0 : box 0,240,640,480
ink rgb(255,255,0),0 : circle mousex(),mousey(),8

rem Read from display and write elsewhere
lock backbuffer
ptr=get backbuffer ptr()
pitch=get backbuffer pitch()
adv=pitch*(get backbuffer height()/2)
chunk=(screen width()-40)*bitsperpixel
chunka#=wrapvalue(chunka#+8)
for y=0 to get backbuffer height()/2 step 2
 chunkx=20+((cos(wrapvalue(chunka#+(y*2))))*15)
 copy memory ptr+adv+(y*pitch)+(chunkx*bitsperpixel),ptr+(y*pitch),chunk
next y
unlock backbuffer

rem Show Framerate
text 20,screen height()-40,desc$
fps$="DBPro Fps: "+str$(screen fps())
text screen width()-20-text width(fps$),screen height()-40,fps$

rem Update screen
sync

rem End loop
loop