94 lines
2.2 KiB
Factor
94 lines
2.2 KiB
Factor
USING: accessors destructors kernel math math.order namespaces
|
|
system threads ;
|
|
IN: game-loop
|
|
|
|
TUPLE: game-loop
|
|
{ tick-length integer read-only }
|
|
delegate
|
|
{ last-tick integer }
|
|
thread
|
|
{ running? boolean }
|
|
{ tick-number integer }
|
|
{ frame-number integer }
|
|
{ benchmark-time integer }
|
|
{ benchmark-tick-number integer }
|
|
{ benchmark-frame-number integer } ;
|
|
|
|
GENERIC: tick* ( delegate -- )
|
|
GENERIC: draw* ( tick-slice delegate -- )
|
|
|
|
SYMBOL: game-loop
|
|
|
|
: since-last-tick ( loop -- milliseconds )
|
|
last-tick>> millis swap - ;
|
|
|
|
: tick-slice ( loop -- slice )
|
|
[ since-last-tick ] [ tick-length>> ] bi /f 1.0 min ;
|
|
|
|
CONSTANT: MAX-FRAMES-TO-SKIP 5
|
|
|
|
<PRIVATE
|
|
|
|
: redraw ( loop -- )
|
|
[ 1+ ] change-frame-number
|
|
[ tick-slice ] [ delegate>> ] bi draw* ;
|
|
|
|
: tick ( loop -- )
|
|
delegate>> tick* ;
|
|
|
|
: increment-tick ( loop -- )
|
|
[ 1+ ] change-tick-number
|
|
dup tick-length>> [ + ] curry change-last-tick
|
|
drop ;
|
|
|
|
: ?tick ( loop count -- )
|
|
dup zero? [ drop millis >>last-tick drop ] [
|
|
over [ since-last-tick ] [ tick-length>> ] bi >=
|
|
[ [ drop increment-tick ] [ drop tick ] [ 1- ?tick ] 2tri ]
|
|
[ 2drop ] if
|
|
] if ;
|
|
|
|
: (run-loop) ( loop -- )
|
|
dup running?>>
|
|
[ [ MAX-FRAMES-TO-SKIP ?tick ] [ redraw ] [ yield (run-loop) ] tri ]
|
|
[ drop ] if ;
|
|
|
|
: run-loop ( loop -- )
|
|
dup game-loop [ (run-loop) ] with-variable ;
|
|
|
|
: benchmark-millis ( loop -- millis )
|
|
millis swap benchmark-time>> - ;
|
|
|
|
PRIVATE>
|
|
|
|
: reset-loop-benchmark ( loop -- )
|
|
millis >>benchmark-time
|
|
dup tick-number>> >>benchmark-tick-number
|
|
dup frame-number>> >>benchmark-frame-number
|
|
drop ;
|
|
|
|
: benchmark-ticks-per-second ( loop -- n )
|
|
[ tick-number>> ] [ benchmark-tick-number>> - ] [ benchmark-millis ] tri /f ;
|
|
: benchmark-frames-per-second ( loop -- n )
|
|
[ frame-number>> ] [ benchmark-frame-number>> - ] [ benchmark-millis ] tri /f ;
|
|
|
|
: start-loop ( loop -- )
|
|
millis >>last-tick
|
|
t >>running?
|
|
[ reset-loop-benchmark ]
|
|
[ [ run-loop ] curry "game loop" spawn ]
|
|
[ (>>thread) ] tri ;
|
|
|
|
: stop-loop ( loop -- )
|
|
f >>running?
|
|
f >>thread
|
|
drop ;
|
|
|
|
: <game-loop> ( tick-length delegate -- loop )
|
|
millis f f 0 0 millis 0 0
|
|
game-loop boa ;
|
|
|
|
M: game-loop dispose
|
|
stop-loop ;
|
|
|