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 (gacela utils)
24 #:use-module (ice-9 optargs)
25 #:use-module (ice-9 receive)
41 set-frames-per-second!
53 load-texture-without-cache
54 get-texture-properties
68 load-font-without-texture
70 #:re-export (glPushMatrix
72 #:export-syntax (glmatrix-block))
81 (define* (init-video width height bpp #:key (mode '2d) (title "") (fps 20) (fullscreen 'off))
82 (SDL_Init SDL_INIT_VIDEO)
83 (let ((info (SDL_GetVideoInfo)))
84 (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
85 (set! flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
86 (if (= (assoc-ref info 'hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
87 (if (= (assoc-ref info 'blit_hw) 0) 0 SDL_HWACCEL)
88 (if (eq? fullscreen 'on) SDL_FULLSCREEN 0)))
89 (set! screen (SDL_SetVideoMode width height bpp flags))
90 (set-screen-title! title)
91 (set-frames-per-second! fps)
92 (set-fullscreen! fullscreen #f)
94 (if (eq? mode '3d) (set-3d-mode) (set-2d-mode))))
96 (define (get-screen-height)
99 (define (get-screen-width)
102 (define (get-screen-bpp)
103 (* (surface-format-BytesPerPixel screen) 8))
105 (define (set-screen-bpp! bpp)
107 (set! screen (SDL_SetVideoMode (get-screen-width) (get-screen-height) (get-screen-bpp) flags)))))
109 (define (resize-screen width height)
111 (set! screen (SDL_SetVideoMode width height (get-screen-bpp) flags))
112 (resize-screen-GL width height))))
116 (SDL_FreeSurface screen)
120 (define (clear-screen)
121 (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT)))
123 (define (flip-screen)
124 (SDL_GL_SwapBuffers))
127 (define screen-title "")
129 (define (set-screen-title! title)
130 (set! screen-title title)
131 (SDL_WM_SetCaption title ""))
133 (define (get-screen-title)
139 (define (set-2d-mode)
141 (glDisable GL_DEPTH_TEST)
142 (resize-screen-GL (get-screen-width) (get-screen-height)))
144 (define (set-3d-mode)
147 (glEnable GL_DEPTH_TEST)
148 (glDepthFunc GL_LEQUAL)
149 (resize-screen-GL (get-screen-width) (get-screen-height)))
155 (define fullscreen 'off)
157 (define* (set-fullscreen! fs #:optional (toggle #t))
158 (cond ((or (and (eq? fullscreen 'on) (eq? fs 'off))
159 (and (eq? fullscreen 'off) (eq? fs 'on)))
162 (SDL_WM_ToggleFullScreen screen))))))
164 (define (get-fullscreen)
169 (glShadeModel GL_SMOOTH)
170 (glClearColor 0 0 0 0)
172 (glBlendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA)
173 (glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST))
175 (define (resize-screen-GL width height)
176 (glViewport 0 0 width height)
177 (glMatrixMode GL_PROJECTION)
180 (let ((ratio (if (= height 0) width (/ width height))))
181 (gluPerspective 45 ratio 0.1 100)))
183 (let* ((w (/ width 2)) (h (/ height 2)))
184 (glOrtho (- w) w (- h) h 0 1))))
185 (glMatrixMode GL_MODELVIEW)
189 ;;; Frames per second
192 (define frames-per-second 20)
193 (define time-per-frame 50) ;in ms
195 (define (get-frames-per-second)
198 (define (set-frames-per-second! fps)
199 (set! frames-per-second fps)
200 (set! time-per-frame (/ 1000.0 fps)))
202 (define (init-frame-time)
203 (set! time (SDL_GetTicks)))
205 (define (get-frame-time)
208 (define (delay-frame)
209 (let ((frame-time (- (SDL_GetTicks) time)))
210 (cond ((< frame-time time-per-frame)
211 (SDL_Delay (- time-per-frame frame-time))))))
216 (define current-color '(1 1 1 1))
218 (define (get-current-color)
221 (define* (set-current-color red green blue #:optional (alpha 1))
222 (set! current-color (list red green blue alpha))
223 (glColor4f red green blue alpha))
225 (define-macro (with-color color . code)
227 `(let ((original-color (get-current-color))
229 (apply set-current-color ,color)
230 (set! result (begin ,@code))
231 (apply set-current-color original-color)
233 (else `(begin ,@code))))
235 (define-macro (progn-textures . code)
237 (glEnable GL_TEXTURE_2D)
238 (set! result (begin ,@code))
239 (glDisable GL_TEXTURE_2D)
242 (define (draw . vertexes)
243 (begin-draw (length vertexes))
244 (draw-vertexes vertexes)
247 (define (begin-draw number-of-points)
248 (cond ((= number-of-points 2) (glBegin GL_LINES))
249 ((= number-of-points 3) (glBegin GL_TRIANGLES))
250 ((= number-of-points 4) (glBegin GL_QUADS))
251 ((> number-of-points 4) (glBegin GL_POLYGON))))
253 (define (draw-vertexes vertexes)
254 (cond ((not (null? vertexes))
255 (draw-vertex (car vertexes))
256 (draw-vertexes (cdr vertexes)))))
258 (define* (draw-vertex vertex #:key texture-coord)
259 (cond ((list? (car vertex))
260 (with-color (car vertex)
261 (apply simple-draw-vertex (cadr vertex))))
263 (cond (texture-coord (apply glTexCoord2f texture-coord)))
264 (apply simple-draw-vertex vertex))))
266 (define* (simple-draw-vertex x y #:optional (z 0))
267 (cond ((3d-mode?) (glVertex3f x y z))
268 (else (glVertex2f x y))))
270 (define (load-image filename)
271 (let ((image (IMG_Load filename)))
273 (SDL_DisplayFormatAlpha image)))))
275 (define (load-image-for-texture filename)
276 (let ((image (load-image filename)))
278 (let* ((width (surface-w image)) (height (surface-h image))
279 (power-2 (nearest-power-of-two (min width height)))
281 (cond ((and (= width power-2) (= height power-2)) (values image width height))
282 (else (set! resized-image (resize-surface image power-2 power-2))
283 (if resized-image (values resized-image width height))))))
287 (define (resize-surface surface width height)
288 (let ((old-width (surface-w surface)) (old-height (surface-h surface)))
289 (cond ((and (= width old-width) (= height old-height)) surface)
290 (else (let ((zoomx (/ (+ width 0.5) old-width)) (zoomy (/ (+ height 0.5) old-height)))
291 (zoomSurface surface zoomx zoomy 0))))))
293 (define* (load-texture-without-cache filename #:key (min-filter GL_LINEAR) (mag-filter GL_LINEAR))
296 (image real-w real-h) (load-image-for-texture filename)
298 (let ((width (surface-w image)) (height (surface-h image))
299 (byteorder (if (= SDL_BYTEORDER SDL_LIL_ENDIAN)
300 (if (= (surface-format-BytesPerPixel image) 3) GL_BGR GL_BGRA)
301 (if (= (surface-format-BytesPerPixel image) 3) GL_RGB GL_RGBA)))
302 (texture (car (glGenTextures 1))))
304 (glBindTexture GL_TEXTURE_2D texture)
305 (glTexImage2D GL_TEXTURE_2D 0 4 width height 0 byteorder GL_UNSIGNED_BYTE (surface-pixels image))
306 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER min-filter)
307 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER mag-filter)
308 (set-texture-size! texture real-w real-h)
311 (define load-texture (use-cache-with load-texture-without-cache))
313 (define (get-texture-properties texture)
314 `((width . ,(texture-w texture)) (height . ,(texture-h texture))))
316 (define* (draw-texture texture #:key (zoom 1) (sprite '((0 0) (1 1))))
318 (let ((width (texture-w texture))
319 (height (texture-h texture)))
320 (draw-rectangle (* zoom width (- (caadr sprite) (caar sprite)))
321 (* zoom height (- (cadadr sprite) (cadar sprite)))
323 #:texture-coord sprite)))))
325 (define* (draw-line length #:optional color)
326 (let ((l (/ length 2)))
328 (with-color color (draw (list 0 l) (list 0 (- l)))))
330 (draw (list 0 l) (list 0 (- l)))))))
332 (define (draw-circle radius)
336 (let ((a (degrees-to-radians i)))
337 (draw-vertex (list (* radius (cos a)) (* radius (sin a))))))
340 (define* (draw-quad v1 v2 v3 v4 #:key texture color (texture-coord '((0 0) (1 1))))
343 (glBindTexture GL_TEXTURE_2D texture)
345 (draw-vertex v1 #:texture-coord (car texture-coord))
346 (draw-vertex v2 #:texture-coord (list (caadr texture-coord) (cadar texture-coord)))
347 (draw-vertex v3 #:texture-coord (cadr texture-coord))
348 (draw-vertex v4 #:texture-coord (list (caar texture-coord) (cadadr texture-coord)))
351 (with-color color (draw v1 v2 v3 v4)))
353 (draw v1 v2 v3 v4))))
355 (define* (draw-rectangle width height #:key texture color texture-coord)
356 (let ((w (/ width 2)) (h (/ height 2)))
357 (draw-quad (list (- w) h 0)
362 #:texture-coord texture-coord
365 (define* (draw-square size #:key texture color)
366 (draw-rectangle size size #:texture texture #:color color))
368 (define* (draw-cube #:key (size 1)
369 texture texture-1 texture-2 texture-3 texture-4 texture-5 texture-6
370 color color-1 color-2 color-3 color-4 color-5 color-6)
371 (let ((-size (- size)))
374 (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))
376 (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))
378 (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))
380 (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))
382 (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))
384 (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)))))
386 (define* (gtranslate x y #:optional (z 0))
387 (glTranslatef x y z))
389 (define (grotate . rot)
391 (apply 3d-rotate rot))
393 (2d-rotate (car (last-pair rot))))))
395 (define (3d-rotate xrot yrot zrot)
396 (glRotatef xrot 1 0 0)
397 (glRotatef yrot 0 1 0)
398 (glRotatef zrot 0 0 1))
400 (define (2d-rotate rot)
401 (glRotatef rot 0 0 1))
405 (cond ((3d-mode?) (camera-look))))
407 (define-macro (glmatrix-block . code)
410 (set! result (begin ,@code))
417 ;; (define* (add-light #:key light position ambient (id GL_LIGHT1) (turn-on t))
419 ;; (and light (glLightfv id GL_DIFFUSE (car light) (cadr light) (caddr light) (cadddr light)))
420 ;; (and light position (glLightfv GL_POSITION (car position) (cadr position) (caddr position) (cadddr position)))
421 ;; (and ambient (glLightfv id GL_AMBIENT (car ambient) (cadr ambient) (caddr ambient) (cadddr ambient)))
422 ;; (and turn-on (glEnable id))
428 (define camera-eye '(0 0 0))
429 (define camera-center '(0 0 -100))
430 (define camera-up '(0 1 0))
432 (define* (set-camera #:key eye center up)
433 (cond (eye (set! camera-eye eye)))
434 (cond (center (set! camera-center center)))
435 (cond (up (set! camera-up up))))
437 (define (camera-look)
438 (apply gluLookAt (append camera-eye camera-center camera-up)))
443 (define* (load-font-without-cache font-file #:key (size 40) (encoding ft_encoding_unicode))
444 (let ((font (ftglCreateTextureFont font-file size)))
445 (ftglSetFontFaceSize font size 72)
446 (ftglSetFontCharMap font encoding)
449 (define load-font (use-cache-with load-font-without-cache))
451 (define* (render-text text font #:key (size #f))
453 (cond ((not (= (ftglGetFontFaceSize font) size))
454 (ftglSetFontFaceSize font size 72))))
455 ((not (= (ftglGetFontFaceSize font) (font-size font)))
456 (ftglSetFontFaceSize font (font-size font) 72)))
457 (ftglRenderFont font text FTGL_RENDER_ALL))
463 (make-record-type "mesh"
464 '(draw translate turn rotate inner-properties inner-property properties properties-set! property property-set!)
465 (lambda (record port)
466 (format port "#<mesh: ~a" (mesh-inner-property record 'type))
467 (for-each (lambda (x) (format port " ~a" x))
468 (mesh-properties record))
469 (display ">" port))))
471 (define mesh? (record-predicate mesh-type))
473 (define* (make-mesh type proc)
475 (record-constructor mesh-type)
476 (let ((px 0) (py 0) (pz 0)
480 (let ((inner-properties
482 `((type . ,type) (x . ,px) (y . ,py) (z . ,pz) (ax . ,ax) (ay . ,ay) (az . ,az) (rx . ,rx) (ry . ,ry) (rz . ,rz)))))
488 (gtranslate px py pz)
511 (assoc-ref (inner-properties) prop-name))
515 (lambda (new-properties)
517 (set! properties new-properties))
520 (assoc-ref properties prop-name))
521 (lambda (prop-name value)
523 (set! properties (assoc-set! properties prop-name value))))))))
525 (define (mesh-draw mesh)
526 (((record-accessor mesh-type 'draw) mesh)))
528 (define (mesh-inner-properties mesh)
529 (((record-accessor mesh-type 'inner-properties) mesh)))
531 (define (mesh-inner-property mesh prop-name)
532 (((record-accessor mesh-type 'inner-property) mesh) prop-name))
534 (define (mesh-properties mesh)
535 (((record-accessor mesh-type 'properties) mesh)))
537 (define (mesh-properties-set! mesh new-properties)
538 (((record-accessor mesh-type 'properties-set!) mesh) new-properties))
540 (define (mesh-property mesh prop-name)
541 (((record-accessor mesh-type 'property) mesh) prop-name))
543 (define (mesh-property-set! mesh prop-name value)
544 (((record-accessor mesh-type 'property-set!) mesh) prop-name value))
546 (define* (translate mesh x y #:optional (z 0))
547 (((record-accessor mesh-type 'translate) mesh) x y z)
550 (define (turn mesh . params)
551 (apply ((record-accessor mesh-type 'turn) mesh)
552 (if (>= (length params) 3)
554 (list 0 0 (car params))))
557 (define (rotate mesh . params)
558 (apply ((record-accessor mesh-type 'rotate) mesh)
559 (if (>= (length params) 3)
561 (list 0 0 (car params))))
567 (define (mesh-join . meshes)
571 (for-each (lambda (m) (glmatrix-block (mesh-draw m))) meshes))))
576 (define-macro (primitive header . body)
577 (let* ((type (car header))
579 (list-args (names-arguments args)))
584 (apply (lambda* ,(cons #:key list-args) ,@body)
586 ,@(let get-params ((l list-args))
587 (cond ((null? l) '())
589 (cons (symbol->keyword (car l))
590 (cons `(assoc-ref props ',(car l))
591 (get-params (cdr l)))))))))))))
592 (mesh-properties-set! m (list ,@(map (lambda (a) `(cons ',a ,a)) list-args)))
595 (define-macro (define-primitive header . body)
596 `(define ,(car header) (primitive ,header ,@body)))
599 ;;; Primitives definition
601 (define-primitive (square size #:key texture color)
602 (draw-square size #:texture texture #:color color))
604 (define-primitive (rectangle width height #:key texture color texture-coord)
605 (draw-rectangle width height #:texture texture #:color color #:texture-coord texture-coord))
607 (define-primitive (circle radius)
608 (draw-circle radius))
610 (define-primitive (picture filename #:key (min-filter GL_LINEAR) (mag-filter GL_LINEAR) (zoom 1) (sprite '((0 0) (1 1))))
611 (draw-texture (load-texture filename #:min-filter min-filter #:mag-filter mag-filter) #:zoom zoom #:sprite sprite))
614 (module-map (lambda (sym var)
615 (if (not (eq? sym '%module-public-interface))
616 (module-export! (current-module) (list sym))))