;;; Default values for Gacela
+
+(define *title* "Gacela")
(define *width-screen* 640)
(define *height-screen* 480)
(define *bpp-screen* 32)
(define *frames-per-second* 20)
+(define *mode* '2d)
-;;; SDL Initialization Subsystem
-(define init-sdl #f)
-(define quit-sdl #f)
+;;; Resources Cache
-(let ((initialized #f))
- (set! init-sdl
- (lambda ()
- (cond ((not initialized) (SDL_Init SDL_INIT_EVERYTHING) (set! initialized #t))
- (else initialized))))
+(define resources-cache (make-weak-value-hash-table))
- (set! quit-sdl
- (lambda ()
- (SDL_Quit)
- (set! initialized #f))))
-
-
-;;; Video Subsystem
-(define init-video-mode #f)
-(define resize-screen #f)
-(define apply-mode-change #f)
-(define quit-video-mode #f)
-
-(let ((screen #f) (flags 0) (current-width *width-screen*) (current-height *height-screen*) (current-bpp *bpp-screen*))
- (set! init-video-mode
- (lambda* (#:optional (width current-width) (height current-height) (bpp current-bpp))
- (cond ((not screen)
- (init-sdl)
- (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
- (set! flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
- (if (= (getf (SDL_GetVideoInfo) :hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
- (if (= (getf (SDL_GetVideoInfo) :blit_hw) 0) 0 SDL_HWACCEL)))
- (set! screen (SDL_SetVideoMode width height bpp flags))
- (init-GL)
- (resize-screen-GL width height)
- (set! current-width width)
- (set! current-height height)
- (set! current-bpp bpp))
- (else #t))))
-
- (set! resize-screen
- (lambda* (width height #:optional (bpp current-bpp))
- (cond (screen (set! screen (SDL_SetVideoMode width height bpp flags))
- (resize-screen-GL width height)))
- (set! current-width width)
- (set! current-height height)))
-
- (set! apply-mode-change
- (lambda () (resize-screen-GL current-width current-height)))
-
- (set! quit-video-mode
- (lambda () (set! screen #f))))
-
-(define (set-2d-mode)
- (cond ((not (3d-mode?))
- (init-video-mode)
- (glDisable GL_DEPTH_TEST)
- (apply-mode-change))))
-
-(define (set-3d-mode)
- (cond ((3d-mode?)
- (init-video-mode)
- (glClearDepth 1)
- (glEnable GL_DEPTH_TEST)
- (glDepthFunc GL_LEQUAL)
- (apply-mode-change))))
-
-(define (3d-mode?)
- (eq? (assoc-ref (get-game-properties) 'mode) '3d))
-
-(define (init-GL)
- (glShadeModel GL_SMOOTH)
- (glClearColor 0 0 0 0)
-; (glClearDepth 1)
-; (glDepthFunc GL_LEQUAL)
-; (glEnable GL_BLEND)
-; (glBlendFunc GL_SRC_ALPHA GL_ONE)
- (glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST)
- #t)
-
-(define (init-lighting)
- (init-video-mode)
- (glEnable GL_LIGHTING))
-
-(define (resize-screen-GL width height)
- (glViewPort 0 0 width height)
- (glMatrixMode GL_PROJECTION)
- (glLoadIdentity)
- (cond ((3d-mode?) (let ((ratio (if (= height 0) width (/ width height))))
- (gluPerspective 45 ratio 0.1 100))) ;0.1
- (else (let* ((w (/ width 2)) (-w (neg w)) (h (/ height 2)) (-h (neg h)))
- (glOrtho -w w -h h 0 1))))
- (glMatrixMode GL_MODELVIEW)
- (glLoadIdentity)
- #t)
-
-(define get-current-color #f)
-(define set-current-color #f)
-
-(let ((current-color '(1 1 1 1)))
- (set! get-current-color
- (lambda ()
- current-color))
-
- (set! set-current-color
- (lambda* (red green blue #:optional (alpha 1))
- (set! current-color (list red green blue alpha))
- (glColor4f red green blue alpha))))
-
-(define* (load-image image-file #:key transparent-color)
- (init-video-mode)
- (let ((loaded-image (IMG_Load image-file)))
- (cond ((= loaded-image 0) #f)
- (else (let ((optimized-image (SDL_DisplayFormat loaded-image)))
- (SDL_FreeSurface loaded-image)
- (cond ((= optimized-image 0) #f)
- ((not transparent-color) optimized-image)
- (else (SDL_SetColorKey optimized-image
- SDL_SRCCOLORKEY
- (SDL_MapRGB (surface-format optimized-image)
- (car transparent-color)
- (cadr transparent-color)
- (caddr transparent-color)))
- optimized-image)))))))
-
-
-;;; Audio Subsystem
-(define init-audio #f)
-(define quit-audio #f)
-
-(let ((audio #f))
- (set! init-audio
- (lambda ()
- (cond ((not audio) (begin (init-sdl) (set! audio (Mix_OpenAudio 22050 MIX_DEFAULT_FORMAT 2 4096))))
- (else audio))))
+(define from-cache #f)
+(define into-cache #f)
- (set! quit-audio
- (lambda ()
- (Mix_CloseAudio)
- (set! audio #f))))
+(let ()
+ (set! from-cache
+ (lambda (key)
+ (hash-ref resources-cache key)))
+
+ (set! into-cache
+ (lambda (key res)
+ (hash-set! resources-cache key res))))
;;; GaCeLa Functions
+
(define set-frames-per-second #f)
(define init-frame-time #f)
+(define get-frame-time #f)
(define delay-frame #f)
(let ((time 0) (time-per-frame (/ 1000.0 *frames-per-second*)))
(lambda ()
(set! time (SDL_GetTicks))))
+ (set! get-frame-time
+ (lambda ()
+ time))
+
(set! delay-frame
(lambda ()
(let ((frame-time (- (SDL_GetTicks) time)))
(SDL_Delay (- time-per-frame frame-time))))))))
-(define set-game-properties #f)
+(define set-game-properties! #f)
(define get-game-properties #f)
-(let ((ptitle "") (pwidth *width-screen*) (pheight *height-screen*) (pbpp *bpp-screen*) (pfps *frames-per-second*) (pmode '2d))
- (set! set-game-properties
+(let ((ptitle *title*) (pwidth *width-screen*) (pheight *height-screen*) (pbpp *bpp-screen*) (pfps *frames-per-second*) (pmode *mode*))
+ (set! set-game-properties!
(lambda* (#:key title width height bpp fps mode)
- (init-video-mode)
- (if title (begin (set! ptitle title) (SDL_WM_SetCaption title "")))
+; (init-video-mode)
+ (if title
+ (begin
+ (set! ptitle title)
+ (if (video-mode-on?) (SDL_WM_SetCaption title ""))))
(if (or width height bpp)
(begin
(if width (set! pwidth width))
(if height (set! pheight height))
(if bpp (set! pbpp bpp))
- (resize-screen pwidth pheight pbpp)))
- (if fps (begin (set! pfps fps) (set-frames-per-second fps)))
- (if mode (begin (set! pmode mode) (if (eq? mode '3d) (set-3d-mode) (set-2d-mode))))
+ (if (video-mode-on?) (resize-screen pwidth pheight pbpp))))
+ (if fps
+ (begin
+ (set! pfps fps)
+ (set-frames-per-second fps)))
+ (if mode
+ (begin
+ (set! pmode mode)
+ (if (video-mode-on?)
+ (if (eq? mode '3d) (set-3d-mode) (set-2d-mode)))))
(get-game-properties)))
(set! get-game-properties
(lambda ()
- (list :title ptitle :width pwidth :height pheight :bpp pbpp :fps pfps :mode pmode)))
+ `((title . ,ptitle) (width . ,pwidth) (height . ,pheight) (bpp . ,pbpp) (fps . ,pfps) (mode . ,pmode)))))
-(defmacro run-game (&body code)
- `(let ((game-function (lambda () ,@code)))
+(define-macro (run-game . code)
+ `(let ((game-function ,(if (null? code)
+ `(lambda () #f)
+ `(lambda () ,@code))))
(init-video-mode)
(set-game-code game-function)
(cond ((not (game-running?))
(game-loop)))))
-(let (running game-code)
- (defun game-loop ()
- (setq running t)
- (do () ((quit?))
- (init-frame-time)
- (check-connections)
- (eval-from-clients)
- (process-events)
- (cond ((not (quit?))
- (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT))
- (to-origin)
- (refresh-active-objects)
- (when (functionp game-code) (funcall game-code))
- (render-objects)
- (SDL_GL_SwapBuffers)
- (delay-frame))))
- (setq running nil))
-
- (defun game-running? ()
- running)
-
- (defun set-game-code (game-function)
- (setq game-code game-function)))
-
-(defun quit-game ()
- (free-all-resources)
- (quit-audio)
- (quit-video-mode)
-; (quit-all-mobs)
- (kill-all-objects)
-; (clear-events)
-; (quit-events)
- (quit-sdl))
+(define game-loop #f)
+(define game-running? #f)
+(define set-game-code #f)
+
+(let ((running #f) (game-code #f))
+ (set! game-loop
+ (lambda ()
+ (refresh-active-mobs)
+ (set! running #t)
+ (quit! #f)
+ (do () ((quit?))
+ (init-frame-time)
+ (check-connections)
+ (eval-from-clients)
+ (process-events)
+ (cond ((not (quit?))
+ (cond ((video-mode-on?)
+ (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT))
+ (to-origin)))
+ (refresh-active-mobs)
+ (if (procedure? game-code)
+ (catch #t
+ (lambda () (game-code))
+ (lambda (key . args) #f)))
+ (cond ((video-mode-on?)
+ (run-mobs)
+ (SDL_GL_SwapBuffers)))
+ (delay-frame))))
+ (set! running #f)))
+
+ (set! game-running?
+ (lambda ()
+ running))
+
+ (set! set-game-code
+ (lambda (game-function)
+ (set! game-code game-function))))