1 ;;; Gacela, a GNU Common Lisp 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 (in-package :gacela :nicknames '(gg))
20 ;;; Default values for Gacela
21 (defvar *width-screen* 640)
22 (defvar *height-screen* 480)
23 (defvar *bpp-screen* 32)
24 (defvar *title-screen* "Happy Hacking!!")
25 (defvar *frames-per-second* 20)
26 (defvar *transparent-color* '(:red 0 :green 0 :blue 0))
27 (defvar *background-color* '(:red 0 :green 0 :blue 0))
29 ;;; SDL Initialization Subsystem
33 (cond ((null initialized) (setq initialized (SDL_Init SDL_INIT_EVERYTHING)))
37 (setq initialized (SDL_Quit))))
41 (let (screen flags current-width current-height)
43 (defun init-video-mode (&key (width *width-screen*) (height *height-screen*) (bpp *bpp-screen*))
46 (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
47 (setq flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
48 (if (= (getf (SDL_GetVideoInfo) :hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
49 (if (= (getf (SDL_GetVideoInfo) :blit_hw) 0) 0 SDL_HWACCEL)))
50 (setq screen (SDL_SetVideoMode width height bpp flags))
52 (resize-screen-GL width height)
53 (setq current-width width current-height height))
56 (defun resize-screen (width height bpp)
57 (setq screen (SDL_SetVideoMode width height bpp flags))
58 (resize-screen-GL width height)
59 (setq current-width width current-height height))
61 (defun apply-mode-change ()
62 (resize-screen-GL current-width current-height))
64 (defun fill-screen (color)
66 (fill-surface screen (getf color :red) (getf color :green) (getf color :blue)))
69 (cond ((null screen) nil)
70 (t (SDL_Flip screen))))
72 (defun quit-video-mode ()
80 (glDisable GL_DEPTH_TEST)
81 (apply-mode-change))))
84 (cond ((not (3d-mode?))
88 (glEnable GL_DEPTH_TEST)
89 (glDepthFunc GL_LEQUAL)
90 (apply-mode-change))))
96 (glShadeModel GL_SMOOTH)
97 (glClearColor 0 0 0 0)
99 ; (glDepthFunc GL_LEQUAL)
100 ; (glEnable GL_BLEND)
101 ; (glBlendFunc GL_SRC_ALPHA GL_ONE)
102 (glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST)
105 (defun init-lighting ()
107 (glEnable GL_LIGHTING))
109 (defun resize-screen-GL (width height)
110 (glViewPort 0 0 width height)
111 (glMatrixMode GL_PROJECTION)
113 (cond ((3d-mode?) (let ((ratio (if (= height 0) width (/ width height))))
114 (gluPerspective 45 ratio 0.1 100))) ;0.1
115 (t (let* ((w (/ width 2)) (-w (neg w)) (h (/ height 2)) (-h (neg h)))
116 (glOrtho -w w -h h 0 1))))
117 (glMatrixMode GL_MODELVIEW)
121 (let ((current-color '(1 1 1 1)))
122 (defun get-current-color ()
125 (defun set-current-color (red green blue &optional (alpha 1))
126 (setq current-color (list red green blue alpha))
127 (glColor4f red green blue alpha)))
129 (defun load-image (image-file &key (transparent-color nil))
131 (let ((loaded-image (IMG_Load image-file)))
132 (cond ((= loaded-image 0) nil)
133 (t (let ((optimized-image (SDL_DisplayFormat loaded-image)))
134 (SDL_FreeSurface loaded-image)
135 (cond ((= optimized-image 0) nil)
136 ((null transparent-color) optimized-image)
137 (t (SDL_SetColorKey optimized-image
139 (SDL_MapRGB (surface-format optimized-image)
140 (car transparent-color)
141 (cadr transparent-color)
142 (caddr transparent-color)))
143 optimized-image)))))))
150 (cond ((null audio) (progn (init-sdl) (setq audio (Mix_OpenAudio 22050 2 4096))))
154 (setq audio (Mix_CloseAudio))))
157 ;;; Resources Manager
158 (defstruct resource plist constructor destructor time)
160 (defun make-resource-texture (&key filename min-filter mag-filter)
161 `(:type texture :filename ,filename :min-filter ,min-filter :mag-filter ,mag-filter))
163 (defun make-resource-font (&key filename encoding)
164 `(:type font :filename ,filename :enconding ,encoding))
166 (defmacro get-rtime (key)
167 `(resource-time (gethash ,key resources-table)))
169 (defmacro get-rplist (key)
170 `(resource-plist (gethash ,key resources-table)))
172 (defmacro get-rconstructor (key)
173 `(resource-constructor (gethash ,key resources-table)))
175 (defmacro get-rdestructor (key)
176 `(resource-destructor (gethash ,key resources-table)))
178 (let ((resources-table (make-hash-table :test 'equal))
179 (expiration-time 50000))
181 (defun set-expiration-time (new-time)
182 (setq expiration-time new-time))
184 (defun set-resource (key plist constructor destructor &key static)
186 (setf (gethash key resources-table)
187 (make-resource :plist plist
188 :constructor constructor
189 :destructor destructor
190 :time (if static t (SDL_GetTicks)))))
192 (defun get-resource (key)
193 (cond ((null (gethash key resources-table)) nil)
194 (t (let ((time (get-rtime key)))
195 (cond ((null time) (funcall (get-rconstructor key)))
196 ((numberp time) (setf (get-rtime key) (SDL_GetTicks))))
199 (defun free-resource (key)
200 (funcall (get-rdestructor key))
201 (setf (get-rtime key) nil))
203 (defun expire-resource (key &optional (now (SDL_GetTicks)))
204 (let ((time (get-rtime key)))
205 (cond ((and (numberp time) (> (- now time) expiration-time)) (free-resource key)))))
207 (defun expire-resources ()
208 (maphash (lambda (key res) (expire-resource key)) resources-table))
210 (defun free-all-resources ()
211 (maphash (lambda (key res) (free-resource key)) resources-table)))
214 ;;; Connection with Gacela Skin Clients
215 (let (server-socket clients)
216 (defun start-skin-server (port)
217 (cond ((null server-socket) (setq server-socket (si::socket port :server #'check-skin-connections)))))
219 (defun check-skin-connections ()
220 (cond ((listen server-socket) (setq clients (cons (si::accept server-socket) clients)))))
222 (defun eval-from-skin ()
224 (when (si::listen socket)
225 (secure-block socket (eval (read socket)))))
227 (defun stop-skin-client ()
234 (let (time (time-per-frame (/ 1000.0 *frames-per-second*)))
235 (defun set-frames-per-second (fps)
236 (setq time-per-frame (/ 1000.0 fps)))
238 (defun init-frame-time ()
239 (setq time (SDL_GetTicks)))
241 (defun delay-frame ()
242 (let ((frame-time (- (SDL_GetTicks) time)))
243 (cond ((< frame-time time-per-frame)
244 (SDL_Delay (- time-per-frame frame-time)))))))
247 (defmacro run-game (title &body code)
248 `(let ((game-function (lambda () ,@code)))
250 (SDL_WM_SetCaption ,title "")
251 (set-game-code game-function)
252 (cond ((not (game-running?))
257 (let (running game-code)
261 (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT))
263 (when (functionp game-code) (funcall game-code))
271 (defun game-running? ()
274 (defun set-game-code (game-function)
275 (setq game-code game-function)))