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[gacela.git] / gacela.lisp

diff --git a/gacela.lisp b/gacela.lisp
index aea2df64dba8740354591c7a2f061ebf239f969c..4dc430aef63b9f913855670747173f63f45bb6b1 100644 (file)
--- a/gacela.lisp
+++ b/gacela.lisp
@@ -22,7 +22,8 @@
 (defvar *height-screen* 480)
 (defvar *bpp-screen* 32)
 (defvar *title-screen* "Happy Hacking!!")
-(defvar *gacela-freq* 30)
+(defvar *frames-per-second* 30)
+;(defvar *gacela-freq* 100)
 (defvar *transparent-color* '(:red 0 :green 0 :blue 0))
 (defvar *background-color* '(:red 0 :green 0 :blue 0))
 
@@ -349,16 +350,20 @@
                     (run-com running)))))))
 
 (defmacro run-game (title &body code)
-  `(progn
+  `(let ((fpstemp (make-timer)))
      (init-video-mode)
      (SDL_WM_SetCaption ,title "")
      (process-events)
      (do () ((quit?))
+        (start-timer fpstemp)
         (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT))
         (glLoadIdentity)
         ,@code
         (SDL_GL_SwapBuffers)
-        (SDL_Delay (- *gacela-freq* (rem (SDL_GetTicks) *gacela-freq*)))
+        (let ((frame-time (get-time fpstemp)) (time-per-frame (/ 1000.0 *frames-per-second*)))
+          (cond ((< frame-time time-per-frame)
+                 (SDL_Delay (- time-per-frame frame-time)))))
+;       (SDL_Delay (- *gacela-freq* (rem (SDL_GetTicks) *gacela-freq*)))
         (process-events)
         (setq running nil))))