1 USING: accessors calendar continuations destructors kernel math
2 math.order namespaces system threads ui ui.gadgets.worlds
7 { tick-length integer read-only }
12 { tick-number integer }
13 { frame-number integer }
14 { benchmark-time integer }
15 { benchmark-tick-number integer }
16 { benchmark-frame-number integer } ;
18 GENERIC: tick* ( delegate -- )
19 GENERIC: draw* ( tick-slice delegate -- )
23 : since-last-tick ( loop -- milliseconds )
24 last-tick>> millis swap - ;
26 : tick-slice ( loop -- slice )
27 [ since-last-tick ] [ tick-length>> ] bi /f 1.0 min ;
29 CONSTANT: MAX-FRAMES-TO-SKIP 5
33 TUPLE: game-loop-error game-loop error ;
35 : ?ui-error ( error -- )
36 ui-running? [ ui-error ] [ rethrow ] if ;
38 : game-loop-error ( game-loop error -- )
39 [ drop stop-loop ] [ \ game-loop-error boa ?ui-error ] 2bi ;
44 [ 1+ ] change-frame-number
45 [ tick-slice ] [ delegate>> ] bi draw* ;
50 : increment-tick ( loop -- )
51 [ 1+ ] change-tick-number
52 dup tick-length>> [ + ] curry change-last-tick
55 : ?tick ( loop count -- )
56 [ millis >>last-tick drop ] [
57 over [ since-last-tick ] [ tick-length>> ] bi >=
58 [ [ drop increment-tick ] [ drop tick ] [ 1- ?tick ] 2tri ]
62 : (run-loop) ( loop -- )
64 [ [ MAX-FRAMES-TO-SKIP ?tick ] [ redraw ] [ 1 milliseconds sleep (run-loop) ] tri ]
67 : run-loop ( loop -- )
69 [ [ (run-loop) ] [ game-loop-error ] recover ]
72 : benchmark-millis ( loop -- millis )
73 millis swap benchmark-time>> - ;
77 : reset-loop-benchmark ( loop -- )
78 millis >>benchmark-time
79 dup tick-number>> >>benchmark-tick-number
80 dup frame-number>> >>benchmark-frame-number
83 : benchmark-ticks-per-second ( loop -- n )
84 [ tick-number>> ] [ benchmark-tick-number>> - ] [ benchmark-millis ] tri /f ;
85 : benchmark-frames-per-second ( loop -- n )
86 [ frame-number>> ] [ benchmark-frame-number>> - ] [ benchmark-millis ] tri /f ;
88 : start-loop ( loop -- )
91 [ reset-loop-benchmark ]
92 [ [ run-loop ] curry "game loop" spawn ]
95 : stop-loop ( loop -- )
100 : <game-loop> ( tick-length delegate -- loop )
101 millis f f 0 0 millis 0 0
107 USING: vocabs vocabs.loader ;
109 "prettyprint" vocab [ "game-loop.prettyprint" require ] when