diff options
| -rw-r--r-- | sly/game.scm | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/sly/game.scm b/sly/game.scm index a0dbcdc..5d3f708 100644 --- a/sly/game.scm +++ b/sly/game.scm @@ -34,6 +34,8 @@ #:use-module (sly signal) #:use-module (sly math vector) #:use-module (sly window) + #:use-module (sly render context) + #:use-module (sly render scene) #:export (draw-hook after-game-loop-error-hook start-game-loop @@ -60,25 +62,30 @@ for the given STACK and error KEY with additional arguments ARGS." (apply display-error (stack-ref stack 0) cep args) (newline cep))) -(define* (start-game-loop #:optional #:key +(define* (start-game-loop scene #:key (frame-rate 60) (tick-rate 60) (max-ticks-per-frame 4)) - "Start the game loop. FRAME-RATE specifies the optimal number of -frames to draw per second. TICK-RATE specifies the optimal game logic + "Run the game loop. SCENE is a signal which contains the current +scene to render. FRAME-RATE specifies the optimal number of frames to +draw SCENE per second. TICK-RATE specifies the optimal game logic updates per second. Both FRAME-RATE and TICK-RATE are 60 by default. MAX-TICKS-PER-FRAME is the maximum number of times the game loop will update game state in a single frame. When this upper bound is reached due to poor performance, the game will start to slow down instead of becoming completely unresponsive and possibly crashing." - (let ((tick-interval (interval tick-rate)) - (frame-interval (interval frame-rate))) + (let ((tick-interval (interval tick-rate)) + (frame-interval (interval frame-rate)) + (context (make-render-context))) + (define (draw dt alpha) "Render a frame." (let ((size (signal-ref window-size))) (gl-viewport 0 0 (vx size) (vy size))) (gl-clear (clear-buffer-mask color-buffer depth-buffer)) (run-hook draw-hook dt alpha) + (with-render-context context + (draw-scene (signal-ref scene) context)) (SDL:gl-swap-buffers)) (define (update lag) |