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 (define-module (gacela video)
19 #:use-module (gacela sdl)
20 #:use-module (gacela gl)
21 #:use-module (gacela ftgl)
22 #:use-module (gacela math)
23 #:use-module (ice-9 optargs)
24 #:use-module (ice-9 receive)
40 set-frames-per-second!
64 #:export-syntax (glmatrix-block)
65 #:re-export (glPushMatrix
75 (define* (init-video width height bpp #:key (mode '2d) (title "") (fps 20))
76 (SDL_Init SDL_INIT_VIDEO)
77 (let ((info (SDL_GetVideoInfo)))
78 (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
79 (set! flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
80 (if (= (assoc-ref info 'hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
81 (if (= (assoc-ref info 'blit_hw) 0) 0 SDL_HWACCEL)))
82 (set! screen (SDL_SetVideoMode width height bpp flags))
83 (set-screen-title! title)
84 (set-frames-per-second! fps)
86 (if (eq? mode '3d) (set-3d-mode) (set-2d-mode))))
88 (define (get-screen-height)
91 (define (get-screen-width)
94 (define (get-screen-bpp)
95 (* (surface-format-BytesPerPixel screen) 8))
97 (define (set-screen-bpp! bpp)
99 (set! screen (SDL_SetVideoMode (get-screen-width) (get-screen-height) bpp flags)))))
101 (define (resize-screen width height)
103 (set! screen (SDL_SetVideoMode width height (get-screen-bpp) flags))
104 (resize-screen-GL width height))))
108 (SDL_FreeSurface screen)
112 (define (clear-screen)
113 (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT)))
115 (define (flip-screen)
116 (SDL_GL_SwapBuffers))
119 (define screen-title "")
121 (define (set-screen-title! title)
122 (set! screen-title title)
123 (SDL_WM_SetCaption title ""))
125 (define (get-screen-title)
131 (define (set-2d-mode)
133 (glDisable GL_DEPTH_TEST)
134 (resize-screen-GL (get-screen-width) (get-screen-height)))
136 (define (set-3d-mode)
139 (glEnable GL_DEPTH_TEST)
140 (glDepthFunc GL_LEQUAL)
141 (resize-screen-GL (get-screen-width) (get-screen-height)))
148 (glShadeModel GL_SMOOTH)
149 (glClearColor 0 0 0 0)
151 (glBlendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA)
152 (glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST))
154 (define (resize-screen-GL width height)
155 (glViewport 0 0 width height)
156 (glMatrixMode GL_PROJECTION)
159 (let ((ratio (if (= height 0) width (/ width height))))
160 (gluPerspective 45 ratio 0.1 100)))
162 (let* ((w (/ width 2)) (h (/ height 2)))
163 (glOrtho (- w) w (- h) h 0 1))))
164 (glMatrixMode GL_MODELVIEW)
168 ;;; Frames per second
171 (define frames-per-second 20)
172 (define time-per-frame 50) ;in ms
174 (define (get-frames-per-second)
177 (define (set-frames-per-second! fps)
178 (set! frames-per-second fps)
179 (set! time-per-frame (/ 1000.0 fps)))
181 (define (init-frame-time)
182 (set! time (SDL_GetTicks)))
184 (define (get-frame-time)
187 (define (delay-frame)
188 (let ((frame-time (- (SDL_GetTicks) time)))
189 (cond ((< frame-time time-per-frame)
190 (SDL_Delay (- time-per-frame frame-time))))))
195 (define current-color '(1 1 1 1))
197 (define (get-current-color)
200 (define* (set-current-color red green blue #:optional (alpha 1))
201 (set! current-color (list red green blue alpha))
202 (glColor4f red green blue alpha))
204 (define-macro (with-color color . code)
206 `(let ((original-color (get-current-color))
208 (apply set-current-color ,color)
209 (set! result (begin ,@code))
210 (apply set-current-color original-color)
212 (else `(begin ,@code))))
214 (define-macro (progn-textures . code)
216 (glEnable GL_TEXTURE_2D)
217 (set! result (begin ,@code))
218 (glDisable GL_TEXTURE_2D)
221 (define (draw . vertexes)
222 (begin-draw (length vertexes))
223 (draw-vertexes vertexes)
226 (define (begin-draw number-of-points)
227 (cond ((= number-of-points 2) (glBegin GL_LINES))
228 ((= number-of-points 3) (glBegin GL_TRIANGLES))
229 ((= number-of-points 4) (glBegin GL_QUADS))))
231 (define (draw-vertexes vertexes)
232 (cond ((not (null? vertexes))
233 (draw-vertex (car vertexes))
234 (draw-vertexes (cdr vertexes)))))
236 (define* (draw-vertex vertex #:key texture-coord)
237 (cond ((list? (car vertex))
238 (with-color (car vertex)
239 (apply simple-draw-vertex (cadr vertex))))
241 (cond (texture-coord (apply glTexCoord2f texture-coord)))
242 (apply simple-draw-vertex vertex))))
244 (define* (simple-draw-vertex x y #:optional (z 0))
245 (cond ((3d-mode?) (glVertex3f x y z))
246 (else (glVertex2f x y))))
248 (define (load-image filename)
249 (let ((image (IMG_Load filename)))
251 (SDL_DisplayFormatAlpha image)))))
253 (define (load-image-for-texture filename)
254 (let ((image (load-image filename)))
256 (let* ((width (surface-w image)) (height (surface-h image))
257 (power-2 (nearest-power-of-two (min width height)))
259 (cond ((and (= width power-2) (= height power-2)) (values image width height))
260 (else (set! resized-image (resize-surface image power-2 power-2))
261 (if resized-image (values resized-image width height))))))
265 (define (resize-surface surface width height)
266 (let ((old-width (surface-w surface)) (old-height (surface-h surface)))
267 (cond ((and (= width old-width) (= height old-height)) surface)
268 (else (let ((zoomx (/ (+ width 0.5) old-width)) (zoomy (/ (+ height 0.5) old-height)))
269 (zoomSurface surface zoomx zoomy 0))))))
271 (define* (load-texture filename #:key (min-filter GL_LINEAR) (mag-filter GL_LINEAR))
274 (image real-w real-h) (load-image-for-texture filename)
276 (let ((width (surface-w image)) (height (surface-h image))
277 (byteorder (if (= SDL_BYTEORDER SDL_LIL_ENDIAN)
278 (if (= (surface-format-BytesPerPixel image) 3) GL_BGR GL_BGRA)
279 (if (= (surface-format-BytesPerPixel image) 3) GL_RGB GL_RGBA)))
280 (texture (car (glGenTextures 1))))
282 (glBindTexture GL_TEXTURE_2D texture)
283 (glTexImage2D GL_TEXTURE_2D 0 4 width height 0 byteorder GL_UNSIGNED_BYTE (surface-pixels image))
284 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER min-filter)
285 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER mag-filter)
286 (set-texture-size! texture real-w real-h)
289 (define* (draw-texture texture #:optional (zoom 1))
291 (let ((width (texture-w texture))
292 (height (texture-h texture)))
293 (draw-rectangle (* zoom width) (* zoom height) #:texture texture)))))
295 (define* (draw-line length #:optional color)
296 (let ((l (/ length 2)))
298 (with-color color (draw (list 0 l) (list 0 (- l)))))
300 (draw (list 0 l) (list 0 (- l)))))))
302 (define* (draw-quad v1 v2 v3 v4 #:key texture color)
305 (glBindTexture GL_TEXTURE_2D texture)
307 (draw-vertex v1 #:texture-coord '(0 0))
308 (draw-vertex v2 #:texture-coord '(1 0))
309 (draw-vertex v3 #:texture-coord '(1 1))
310 (draw-vertex v4 #:texture-coord '(0 1))
313 (with-color color (draw v1 v2 v3 v4)))
315 (draw v1 v2 v3 v4))))
317 (define* (draw-rectangle width height #:key texture color)
318 (let ((w (/ width 2)) (h (/ height 2)))
319 (draw-quad (list (- w) h 0)
326 (define* (draw-square #:key (size 1) texture color)
327 (draw-rectangle size size #:texture texture #:color color))
329 (define* (draw-cube #:key (size 1)
330 texture texture-1 texture-2 texture-3 texture-4 texture-5 texture-6
331 color color-1 color-2 color-3 color-4 color-5 color-6)
332 (let ((-size (- size)))
335 (draw-quad (list -size size size) (list size size size) (list size -size size) (list -size -size size) #:texture (or texture-1 texture) #:color (or color-1 color))
337 (draw-quad (list -size -size -size) (list size -size -size) (list size size -size) (list -size size -size) #:texture (or texture-2 texture) #:color (or color-2 color))
339 (draw-quad (list size size size) (list -size size size) (list -size size -size) (list size size -size) #:texture (or texture-3 texture) #:color (or color-3 color))
341 (draw-quad (list -size -size size) (list size -size size) (list size -size -size) (list -size -size -size) #:texture (or texture-4 texture) #:color (or color-4 color))
343 (draw-quad (list size -size -size) (list size -size size) (list size size size) (list size size -size) #:texture (or texture-5 texture) #:color (or color-5 color))
345 (draw-quad (list -size -size size) (list -size -size -size) (list -size size -size) (list -size size size) #:texture (or texture-6 texture) #:color (or color-6 color)))))
347 (define* (translate x y #:optional (z 0))
348 (glTranslatef x y z))
350 (define* (rotate #:rest rot)
352 (apply 3d-rotate rot))
354 (apply 2d-rotate rot))))
356 (define (3d-rotate xrot yrot zrot)
357 (glRotatef xrot 1 0 0)
358 (glRotatef yrot 0 1 0)
359 (glRotatef zrot 0 0 1))
361 (define (2d-rotate rot)
362 (glRotatef rot 0 0 1))
366 (cond ((3d-mode?) (camera-look))))
368 (define-macro (glmatrix-block . code)
371 (set! result (begin ,@code))
378 ;; (define* (add-light #:key light position ambient (id GL_LIGHT1) (turn-on t))
380 ;; (and light (glLightfv id GL_DIFFUSE (car light) (cadr light) (caddr light) (cadddr light)))
381 ;; (and light position (glLightfv GL_POSITION (car position) (cadr position) (caddr position) (cadddr position)))
382 ;; (and ambient (glLightfv id GL_AMBIENT (car ambient) (cadr ambient) (caddr ambient) (cadddr ambient)))
383 ;; (and turn-on (glEnable id))
389 (define camera-eye '(0 0 0))
390 (define camera-center '(0 0 -100))
391 (define camera-up '(0 1 0))
393 (define* (set-camera #:key eye center up)
394 (cond (eye (set! camera-eye eye)))
395 (cond (center (set! camera-center center)))
396 (cond (up (set! camera-up up))))
398 (define (camera-look)
399 (apply gluLookAt (append camera-eye camera-center camera-up)))
404 (define* (load-font font-file #:key (size 40) (encoding ft_encoding_unicode))
405 (let ((font (ftglCreateTextureFont font-file size)))
406 (ftglSetFontFaceSize font size 72)
407 (ftglSetFontCharMap font encoding)
410 (define* (render-text text font #:key (size #f))
412 (cond ((not (= (ftglGetFontFaceSize font) size))
413 (ftglSetFontFaceSize font size 72))))
414 ((not (= (ftglGetFontFaceSize font) (font-size font)))
415 (ftglSetFontFaceSize font (font-size font) 72)))
416 (ftglRenderFont font text FTGL_RENDER_ALL))