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collapseos/blk/635

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2020-05-16 05:41:06 +10:00
: _updsel ( -- f, has an action button been pressed? )
_status _prevstat C@ OVER = IF DROP 0 EXIT THEN
DUP _prevstat C! ( changed, update ) ( s )
0x01 ( UP ) OVER AND NOT IF 1 _sel +! THEN
0x02 ( DOWN ) OVER AND NOT IF -1 _sel +! THEN
0x04 ( LEFT ) OVER AND NOT IF -5 _sel +! THEN
0x08 ( RIGHT ) OVER AND NOT IF 5 _sel +! THEN
0x10 ( BUTB ) OVER AND NOT IF _nxtcls THEN
( update sel in VDP )
_chk _sel C@ (emit) -1 XYPOS +!
2020-05-16 05:41:06 +10:00
( return whether any of the high 3 bits is low )
0xe0 AND 0xe0 <
;