1 USING: accessors calendar continuations destructors kernel math
2 math.order namespaces system threads ui ui.gadgets.worlds ;
6 { tick-length integer read-only }
11 { tick-number integer }
12 { frame-number integer }
13 { benchmark-time integer }
14 { benchmark-tick-number integer }
15 { benchmark-frame-number integer } ;
17 GENERIC: tick* ( delegate -- )
18 GENERIC: draw* ( tick-slice delegate -- )
22 : since-last-tick ( loop -- milliseconds )
23 last-tick>> millis swap - ;
25 : tick-slice ( loop -- slice )
26 [ since-last-tick ] [ tick-length>> ] bi /f 1.0 min ;
28 CONSTANT: MAX-FRAMES-TO-SKIP 5
32 TUPLE: game-loop-error game-loop error ;
34 : ?ui-error ( error -- )
35 ui-running? [ ui-error ] [ rethrow ] if ;
37 : game-loop-error ( game-loop error -- )
38 [ drop stop-loop ] [ \ game-loop-error boa ?ui-error ] 2bi ;
43 [ 1+ ] change-frame-number
44 [ tick-slice ] [ delegate>> ] bi draw* ;
49 : increment-tick ( loop -- )
50 [ 1+ ] change-tick-number
51 dup tick-length>> [ + ] curry change-last-tick
54 : ?tick ( loop count -- )
55 dup zero? [ drop millis >>last-tick drop ] [
56 over [ since-last-tick ] [ tick-length>> ] bi >=
57 [ [ drop increment-tick ] [ drop tick ] [ 1- ?tick ] 2tri ]
61 : (run-loop) ( loop -- )
63 [ [ MAX-FRAMES-TO-SKIP ?tick ] [ redraw ] [ 1 milliseconds sleep (run-loop) ] tri ]
66 : run-loop ( loop -- )
68 [ [ (run-loop) ] [ game-loop-error ] recover ]
71 : benchmark-millis ( loop -- millis )
72 millis swap benchmark-time>> - ;
76 : reset-loop-benchmark ( loop -- )
77 millis >>benchmark-time
78 dup tick-number>> >>benchmark-tick-number
79 dup frame-number>> >>benchmark-frame-number
82 : benchmark-ticks-per-second ( loop -- n )
83 [ tick-number>> ] [ benchmark-tick-number>> - ] [ benchmark-millis ] tri /f ;
84 : benchmark-frames-per-second ( loop -- n )
85 [ frame-number>> ] [ benchmark-frame-number>> - ] [ benchmark-millis ] tri /f ;
87 : start-loop ( loop -- )
90 [ reset-loop-benchmark ]
91 [ [ run-loop ] curry "game loop" spawn ]
94 : stop-loop ( loop -- )
99 : <game-loop> ( tick-length delegate -- loop )
100 millis f f 0 0 millis 0 0
106 USING: vocabs vocabs.loader ;
108 "prettyprint" vocab [ "game-loop.prettyprint" require ] when