diff options
| -rw-r--r-- | 2d/game-loop.scm | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/2d/game-loop.scm b/2d/game-loop.scm index 168f6f7..d5f1ed0 100644 --- a/2d/game-loop.scm +++ b/2d/game-loop.scm @@ -237,6 +237,19 @@ the stack." (define running? #f) (define paused? #f) +(define (tick dt accumulator) + "Advance the game by one frame." + (if paused? + (begin + (run-repl) + (SDL:delay tick-interval) + accumulator) + (let ((remainder (update accumulator))) + (run-repl) + (render dt) + (switch-scenes-maybe) + remainder))) + (define (game-loop last-time accumulator) "Update game state, and render. LAST-TIME is the time in milliseconds of the last iteration of the loop. ACCUMULATOR is the @@ -244,12 +257,8 @@ time in milliseconds that has passed since the last game update." (when running? (let* ((current-time (SDL:get-ticks)) (dt (- current-time last-time)) - (remainder (update (+ accumulator dt)))) - (run-repl) - (render dt) - (switch-scenes-maybe) - (game-loop current-time - remainder)))) + (accumulator (+ accumulator dt))) + (game-loop current-time (tick dt accumulator))))) (define (run-game game) "Open a window and start the game loop for GAME." |