1 ;;; Gacela, a GNU Guile extension for fast games development
2 ;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot org>
4 ;;; This program is free software: you can redistribute it and/or modify
5 ;;; it under the terms of the GNU General Public License as published by
6 ;;; the Free Software Foundation, either version 3 of the License, or
7 ;;; (at your option) any later version.
9 ;;; This program is distributed in the hope that it will be useful,
10 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
11 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 ;;; GNU General Public License for more details.
14 ;;; You should have received a copy of the GNU General Public License
15 ;;; along with this program. If not, see <http://www.gnu.org/licenses/>.
18 ;;; Default values for Gacela
19 (define *width-screen* 640)
20 (define *height-screen* 480)
21 (define *bpp-screen* 32)
22 (define *frames-per-second* 20)
24 ;;; SDL Initialization Subsystem
28 (let ((initialized #f))
31 (cond ((not initialized) (SDL_Init SDL_INIT_EVERYTHING) (set! initialized #t))
37 (set! initialized #f))))
42 (define init-video-mode #f)
43 (define resize-screen #f)
44 (define apply-mode-change #f)
45 (define quit-video-mode #f)
47 (let ((screen #f) (flags 0) (current-width *width-screen*) (current-height *height-screen*) (current-bpp *bpp-screen*))
50 (let ((width (cond ((assq 'width args
52 (lambda (&key (width current-width) (height current-height) (bpp *bpp-screen*))
55 (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
56 (set! flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
57 (if (= (getf (SDL_GetVideoInfo) :hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
58 (if (= (getf (SDL_GetVideoInfo) :blit_hw) 0) 0 SDL_HWACCEL)))
59 (set! screen (SDL_SetVideoMode width height bpp flags))
61 (resize-screen-GL width height)
62 (set! current-width width)
63 (set! current-height height)
64 (set! current-bpp bpp))
68 (lambda (width height &optional (bpp current-bpp))
69 (cond (screen (set! screen (SDL_SetVideoMode width height bpp flags))
70 (resize-screen-GL width height)))
71 (set! current-width width)
72 (set! current-height height)))
74 (set! apply-mode-change
75 (lambda () (resize-screen-GL current-width current-height)))
78 (lambda () (set! screen #f))))
81 (cond ((not (3d-mode?))
83 (glDisable GL_DEPTH_TEST)
84 (apply-mode-change))))
90 (glEnable GL_DEPTH_TEST)
91 (glDepthFunc GL_LEQUAL)
92 (apply-mode-change))))
95 (eq (getf (get-game-properties) :mode) '3d))
98 (glShadeModel GL_SMOOTH)
99 (glClearColor 0 0 0 0)
101 ; (glDepthFunc GL_LEQUAL)
102 ; (glEnable GL_BLEND)
103 ; (glBlendFunc GL_SRC_ALPHA GL_ONE)
104 (glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST)
107 (defun init-lighting ()
109 (glEnable GL_LIGHTING))
111 (defun resize-screen-GL (width height)
112 (glViewPort 0 0 width height)
113 (glMatrixMode GL_PROJECTION)
115 (cond ((3d-mode?) (let ((ratio (if (= height 0) width (/ width height))))
116 (gluPerspective 45 ratio 0.1 100))) ;0.1
117 (t (let* ((w (/ width 2)) (-w (neg w)) (h (/ height 2)) (-h (neg h)))
118 (glOrtho -w w -h h 0 1))))
119 (glMatrixMode GL_MODELVIEW)
123 (let ((current-color '(1 1 1 1)))
124 (defun get-current-color ()
127 (defun set-current-color (red green blue &optional (alpha 1))
128 (setq current-color (list red green blue alpha))
129 (glColor4f red green blue alpha)))
131 (defun load-image (image-file &key (transparent-color nil))
133 (let ((loaded-image (IMG_Load image-file)))
134 (cond ((= loaded-image 0) nil)
135 (t (let ((optimized-image (SDL_DisplayFormat loaded-image)))
136 (SDL_FreeSurface loaded-image)
137 (cond ((= optimized-image 0) nil)
138 ((null transparent-color) optimized-image)
139 (t (SDL_SetColorKey optimized-image
141 (SDL_MapRGB (surface-format optimized-image)
142 (car transparent-color)
143 (cadr transparent-color)
144 (caddr transparent-color)))
145 optimized-image)))))))
152 (cond ((null audio) (progn (init-sdl) (setq audio (Mix_OpenAudio 22050 MIX_DEFAULT_FORMAT 2 4096))))
156 (setq audio (Mix_CloseAudio))))
159 ;;; Resources Manager
160 (defstruct resource plist constructor destructor time)
162 (defun make-resource-texture (&key filename min-filter mag-filter)
163 `(:type texture :filename ,filename :min-filter ,min-filter :mag-filter ,mag-filter))
165 (defun make-resource-font (&key filename encoding)
166 `(:type font :filename ,filename :enconding ,encoding))
168 (defun make-resource-sound (&key filename)
169 `(:type sound :filename ,filename))
171 (defun make-resource-music (&key filename)
172 `(:type music :filename ,filename))
174 (defmacro get-rtime (key)
175 `(resource-time (gethash ,key resources-table)))
177 (defmacro get-rplist (key)
178 `(resource-plist (gethash ,key resources-table)))
180 (defmacro get-rconstructor (key)
181 `(resource-constructor (gethash ,key resources-table)))
183 (defmacro get-rdestructor (key)
184 `(resource-destructor (gethash ,key resources-table)))
186 (let ((resources-table (make-hash-table :test 'equal))
187 (expiration-time 50000))
189 (defun set-expiration-time (new-time)
190 (setq expiration-time new-time))
192 (defun set-resource (key plist constructor destructor &key static)
194 (setf (gethash key resources-table)
195 (make-resource :plist plist
196 :constructor constructor
197 :destructor destructor
198 :time (if static t (SDL_GetTicks)))))
200 (defun get-resource (key)
201 (cond ((null (gethash key resources-table)) nil)
202 (t (let ((time (get-rtime key)))
203 (cond ((null time) (funcall (get-rconstructor key)))
204 ((numberp time) (setf (get-rtime key) (SDL_GetTicks))))
207 (defun free-resource (key)
208 (funcall (get-rdestructor key))
209 (setf (get-rtime key) nil))
211 (defun expire-resource (key &optional (now (SDL_GetTicks)))
212 (let ((time (get-rtime key)))
213 (cond ((and (numberp time) (> (- now time) expiration-time)) (free-resource key)))))
215 (defun expire-resources ()
216 (maphash (lambda (key res) (expire-resource key)) resources-table))
218 (defun free-all-resources ()
219 (maphash (lambda (key res) (free-resource key)) resources-table)))
222 ;;; Connection with Gacela Clients
223 (let (server-socket clients)
224 (defun start-server (port)
225 (cond ((null server-socket) (setq server-socket (si::socket port :server #'check-connections)))))
227 (defun check-connections ()
228 (cond ((and server-socket (listen server-socket)) (setq clients (cons (si::accept server-socket) clients)))))
230 (defun eval-from-clients ()
231 (labels ((eval-clients (cli-socks)
233 (let ((cli (car cli-socks)))
234 (cond ((si::listen cli)
235 (secure-block cli (eval (read cli)))
237 (eval-clients (cdr cli-socks)))
239 (cons cli (eval-clients (cdr cli-socks))))))))))
240 (setq clients (eval-clients clients))))
242 (defun stop-server ()
243 (cond (server-socket (si::close server-socket) (setq server-socket nil)))
245 (labels ((close-clients (cli-socks)
246 (si::close (car cli-socks))
247 (close-clients (cdr cli-socks))))
248 (close-clients clients))
249 (setq clients nil)))))
253 (let (time (time-per-frame (/ 1000.0 *frames-per-second*)))
254 (defun set-frames-per-second (fps)
255 (setq time-per-frame (/ 1000.0 fps)))
257 (defun init-frame-time ()
258 (setq time (SDL_GetTicks)))
260 (defun delay-frame ()
261 (let ((frame-time (- (SDL_GetTicks) time)))
262 (cond ((< frame-time time-per-frame)
263 (SDL_Delay (- time-per-frame frame-time)))))))
266 (let ((ptitle "") (pwidth *width-screen*) (pheight *height-screen*) (pbpp *bpp-screen*) (pfps *frames-per-second*) (pmode '2d))
267 (defun set-game-properties (&key title width height bpp fps mode)
269 (when title (progn (setq ptitle title) (SDL_WM_SetCaption title "")))
270 (when (or width height bpp)
272 (when width (setq pwidth width))
273 (when height (setq pheight height))
274 (when bpp (setq pbpp bpp))
275 (resize-screen pwidth pheight pbpp)))
276 (when fps (progn (setq pfps fps) (set-frames-per-second fps)))
277 (when mode (progn (setq pmode mode) (if (eq mode '3d) (set-3d-mode) (set-2d-mode))))
278 (get-game-properties))
280 (defun get-game-properties ()
281 (list :title ptitle :width pwidth :height pheight :bpp pbpp :fps pfps :mode pmode)))
284 (defmacro run-game (&body code)
285 `(let ((game-function (lambda () ,@code)))
287 (set-game-code game-function)
288 (cond ((not (game-running?))
291 (let (running game-code)
300 (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT))
302 (refresh-active-objects)
303 (when (functionp game-code) (funcall game-code))
309 (defun game-running? ()
312 (defun set-game-code (game-function)
313 (setq game-code game-function)))