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 (cond ((null initialized) (set! initialized (SDL_Init SDL_INIT_EVERYTHING)))
32 (set! initialized (SDL_Quit))))
36 (let (screen flags (current-width *width-screen*) (current-height *height-screen*) current-bpp)
38 (defun init-video-mode (&key (width current-width) (height current-height) (bpp *bpp-screen*))
41 (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
42 (setq flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
43 (if (= (getf (SDL_GetVideoInfo) :hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
44 (if (= (getf (SDL_GetVideoInfo) :blit_hw) 0) 0 SDL_HWACCEL)))
45 (setq screen (SDL_SetVideoMode width height bpp flags))
47 (resize-screen-GL width height)
48 (setq current-width width current-height height current-bpp bpp))
51 (defun resize-screen (width height &optional (bpp current-bpp))
52 (cond (screen (setq screen (SDL_SetVideoMode width height bpp flags))
53 (resize-screen-GL width height)))
54 (setq current-width width current-height height))
56 (defun apply-mode-change ()
57 (resize-screen-GL current-width current-height))
59 (defun quit-video-mode ()
63 (cond ((not (3d-mode?))
65 (glDisable GL_DEPTH_TEST)
66 (apply-mode-change))))
72 (glEnable GL_DEPTH_TEST)
73 (glDepthFunc GL_LEQUAL)
74 (apply-mode-change))))
77 (eq (getf (get-game-properties) :mode) '3d))
80 (glShadeModel GL_SMOOTH)
81 (glClearColor 0 0 0 0)
83 ; (glDepthFunc GL_LEQUAL)
85 ; (glBlendFunc GL_SRC_ALPHA GL_ONE)
86 (glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST)
89 (defun init-lighting ()
91 (glEnable GL_LIGHTING))
93 (defun resize-screen-GL (width height)
94 (glViewPort 0 0 width height)
95 (glMatrixMode GL_PROJECTION)
97 (cond ((3d-mode?) (let ((ratio (if (= height 0) width (/ width height))))
98 (gluPerspective 45 ratio 0.1 100))) ;0.1
99 (t (let* ((w (/ width 2)) (-w (neg w)) (h (/ height 2)) (-h (neg h)))
100 (glOrtho -w w -h h 0 1))))
101 (glMatrixMode GL_MODELVIEW)
105 (let ((current-color '(1 1 1 1)))
106 (defun get-current-color ()
109 (defun set-current-color (red green blue &optional (alpha 1))
110 (setq current-color (list red green blue alpha))
111 (glColor4f red green blue alpha)))
113 (defun load-image (image-file &key (transparent-color nil))
115 (let ((loaded-image (IMG_Load image-file)))
116 (cond ((= loaded-image 0) nil)
117 (t (let ((optimized-image (SDL_DisplayFormat loaded-image)))
118 (SDL_FreeSurface loaded-image)
119 (cond ((= optimized-image 0) nil)
120 ((null transparent-color) optimized-image)
121 (t (SDL_SetColorKey optimized-image
123 (SDL_MapRGB (surface-format optimized-image)
124 (car transparent-color)
125 (cadr transparent-color)
126 (caddr transparent-color)))
127 optimized-image)))))))
134 (cond ((null audio) (progn (init-sdl) (setq audio (Mix_OpenAudio 22050 MIX_DEFAULT_FORMAT 2 4096))))
138 (setq audio (Mix_CloseAudio))))
141 ;;; Resources Manager
142 (defstruct resource plist constructor destructor time)
144 (defun make-resource-texture (&key filename min-filter mag-filter)
145 `(:type texture :filename ,filename :min-filter ,min-filter :mag-filter ,mag-filter))
147 (defun make-resource-font (&key filename encoding)
148 `(:type font :filename ,filename :enconding ,encoding))
150 (defun make-resource-sound (&key filename)
151 `(:type sound :filename ,filename))
153 (defun make-resource-music (&key filename)
154 `(:type music :filename ,filename))
156 (defmacro get-rtime (key)
157 `(resource-time (gethash ,key resources-table)))
159 (defmacro get-rplist (key)
160 `(resource-plist (gethash ,key resources-table)))
162 (defmacro get-rconstructor (key)
163 `(resource-constructor (gethash ,key resources-table)))
165 (defmacro get-rdestructor (key)
166 `(resource-destructor (gethash ,key resources-table)))
168 (let ((resources-table (make-hash-table :test 'equal))
169 (expiration-time 50000))
171 (defun set-expiration-time (new-time)
172 (setq expiration-time new-time))
174 (defun set-resource (key plist constructor destructor &key static)
176 (setf (gethash key resources-table)
177 (make-resource :plist plist
178 :constructor constructor
179 :destructor destructor
180 :time (if static t (SDL_GetTicks)))))
182 (defun get-resource (key)
183 (cond ((null (gethash key resources-table)) nil)
184 (t (let ((time (get-rtime key)))
185 (cond ((null time) (funcall (get-rconstructor key)))
186 ((numberp time) (setf (get-rtime key) (SDL_GetTicks))))
189 (defun free-resource (key)
190 (funcall (get-rdestructor key))
191 (setf (get-rtime key) nil))
193 (defun expire-resource (key &optional (now (SDL_GetTicks)))
194 (let ((time (get-rtime key)))
195 (cond ((and (numberp time) (> (- now time) expiration-time)) (free-resource key)))))
197 (defun expire-resources ()
198 (maphash (lambda (key res) (expire-resource key)) resources-table))
200 (defun free-all-resources ()
201 (maphash (lambda (key res) (free-resource key)) resources-table)))
204 ;;; Connection with Gacela Clients
205 (let (server-socket clients)
206 (defun start-server (port)
207 (cond ((null server-socket) (setq server-socket (si::socket port :server #'check-connections)))))
209 (defun check-connections ()
210 (cond ((and server-socket (listen server-socket)) (setq clients (cons (si::accept server-socket) clients)))))
212 (defun eval-from-clients ()
213 (labels ((eval-clients (cli-socks)
215 (let ((cli (car cli-socks)))
216 (cond ((si::listen cli)
217 (secure-block cli (eval (read cli)))
219 (eval-clients (cdr cli-socks)))
221 (cons cli (eval-clients (cdr cli-socks))))))))))
222 (setq clients (eval-clients clients))))
224 (defun stop-server ()
225 (cond (server-socket (si::close server-socket) (setq server-socket nil)))
227 (labels ((close-clients (cli-socks)
228 (si::close (car cli-socks))
229 (close-clients (cdr cli-socks))))
230 (close-clients clients))
231 (setq clients nil)))))
235 (let (time (time-per-frame (/ 1000.0 *frames-per-second*)))
236 (defun set-frames-per-second (fps)
237 (setq time-per-frame (/ 1000.0 fps)))
239 (defun init-frame-time ()
240 (setq time (SDL_GetTicks)))
242 (defun delay-frame ()
243 (let ((frame-time (- (SDL_GetTicks) time)))
244 (cond ((< frame-time time-per-frame)
245 (SDL_Delay (- time-per-frame frame-time)))))))
248 (let ((ptitle "") (pwidth *width-screen*) (pheight *height-screen*) (pbpp *bpp-screen*) (pfps *frames-per-second*) (pmode '2d))
249 (defun set-game-properties (&key title width height bpp fps mode)
251 (when title (progn (setq ptitle title) (SDL_WM_SetCaption title "")))
252 (when (or width height bpp)
254 (when width (setq pwidth width))
255 (when height (setq pheight height))
256 (when bpp (setq pbpp bpp))
257 (resize-screen pwidth pheight pbpp)))
258 (when fps (progn (setq pfps fps) (set-frames-per-second fps)))
259 (when mode (progn (setq pmode mode) (if (eq mode '3d) (set-3d-mode) (set-2d-mode))))
260 (get-game-properties))
262 (defun get-game-properties ()
263 (list :title ptitle :width pwidth :height pheight :bpp pbpp :fps pfps :mode pmode)))
266 (defmacro run-game (&body code)
267 `(let ((game-function (lambda () ,@code)))
269 (set-game-code game-function)
270 (cond ((not (game-running?))
273 (let (running game-code)
282 (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT))
284 (refresh-active-objects)
285 (when (functionp game-code) (funcall game-code))
291 (defun game-running? ()
294 (defun set-game-code (game-function)
295 (setq game-code game-function)))