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 (figl gl)
22 #:use-module (figl glx)
23 #:use-module (figl glu)
24 #:use-module (gacela ftgl)
25 #:use-module (gacela math)
26 #:use-module (gacela utils)
27 #:use-module (ice-9 optargs)
28 #:use-module (ice-9 receive)
29 #:use-module (srfi srfi-9)
30 #:use-module (system foreign)
46 set-frames-per-second!
58 load-texture-without-cache
59 get-texture-properties
73 load-font-without-texture
75 #:re-export (with-gl-push-matrix))
84 (define* (init-video width height bpp #:key (mode '2d) (title "") (fps 20) (fullscreen 'off))
85 (SDL_Init SDL_INIT_VIDEO)
86 (let ((info (SDL_GetVideoInfo)))
87 (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
88 (set! flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
89 (if (= (assoc-ref info 'hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
90 (if (= (assoc-ref info 'blit_hw) 0) 0 SDL_HWACCEL)
91 (if (eq? fullscreen 'on) SDL_FULLSCREEN 0)))
92 (set! screen (SDL_SetVideoMode width height bpp flags))
93 (set-screen-title! title)
94 (set-frames-per-second! fps)
95 (set-fullscreen! fullscreen #f)
97 (if (eq? mode '3d) (set-3d-mode) (set-2d-mode))))
99 (define (get-screen-height)
102 (define (get-screen-width)
105 (define (get-screen-bpp)
106 (* (surface-format-BytesPerPixel screen) 8))
108 (define (set-screen-bpp! bpp)
110 (set! screen (SDL_SetVideoMode (get-screen-width) (get-screen-height) (get-screen-bpp) flags)))))
112 (define (resize-screen width height)
114 (set! screen (SDL_SetVideoMode width height (get-screen-bpp) flags))
115 (resize-screen-GL width height))))
119 (SDL_FreeSurface screen)
123 (define (clear-screen)
124 (gl-clear (clear-buffer-mask color-buffer depth-buffer)))
126 (define (flip-screen)
127 (SDL_GL_SwapBuffers))
130 (define screen-title "")
132 (define (set-screen-title! title)
133 (set! screen-title title)
134 (SDL_WM_SetCaption title ""))
136 (define (get-screen-title)
142 (define (set-2d-mode)
144 (gl-disable (enable-cap depth-test))
145 (resize-screen-GL (get-screen-width) (get-screen-height)))
147 (define (set-3d-mode)
149 (set-gl-clear-depth 1)
150 (gl-enable (enable-cap depth-test))
151 (set-gl-depth-function (depth-function lequal))
152 (resize-screen-GL (get-screen-width) (get-screen-height)))
158 (define fullscreen 'off)
160 (define* (set-fullscreen! fs #:optional (toggle #t))
161 (cond ((or (and (eq? fullscreen 'on) (eq? fs 'off))
162 (and (eq? fullscreen 'off) (eq? fs 'on)))
165 (SDL_WM_ToggleFullScreen screen))))))
167 (define (get-fullscreen)
172 (set-gl-shade-model (shading-model smooth))
173 (set-gl-clear-color 0 0 0 0)
174 (gl-enable (enable-cap blend))
175 (set-gl-blend-function (blending-factor-dest src-alpha) (blending-factor-dest one-minus-src-alpha))
176 (set-gl-hint (hint-target perspective-correction-hint) (hint-mode nicest)))
178 (define (resize-screen-GL width height)
179 (gl-viewport 0 0 width height)
180 (set-gl-matrix-mode (matrix-mode projection))
183 (let ((ratio (if (= height 0) width (/ width height))))
184 (glu-perspective 45 ratio 0.1 100)))
186 (let* ((w (/ width 2)) (h (/ height 2)))
187 (gl-ortho (- w) w (- h) h 0 1))))
188 (set-gl-matrix-mode (matrix-mode modelview))
192 ;;; Frames per second
195 (define frames-per-second 20)
196 (define time-per-frame 50) ;in ms
198 (define (get-frames-per-second)
201 (define (set-frames-per-second! fps)
202 (set! frames-per-second fps)
203 (set! time-per-frame (/ 1000.0 fps)))
205 (define (init-frame-time)
206 (set! time (SDL_GetTicks)))
208 (define (get-frame-time)
211 (define (delay-frame)
212 (let ((frame-time (- (SDL_GetTicks) time)))
213 (cond ((< frame-time time-per-frame)
214 (SDL_Delay (- time-per-frame frame-time))))))
219 (define-record-type <texture>
220 (texture id width height)
223 (width texture-width set-texture-width)
224 (height texture-height set-texture-height))
226 (define-macro (with-textures . code)
228 (gl-enable (oes-framebuffer-object texture-2d))
229 (set! result (begin ,@code))
230 (gl-disable (oes-framebuffer-object texture-2d))
233 (define (load-image filename)
234 (let ((image (IMG_Load filename)))
236 (SDL_DisplayFormatAlpha image)))))
238 (define (load-image-for-texture filename)
239 (let ((image (load-image filename)))
241 (let* ((width (surface-w image)) (height (surface-h image))
242 (power-2 (nearest-power-of-two (min width height)))
244 (cond ((and (= width power-2) (= height power-2)) (values image width height))
245 (else (set! resized-image (resize-surface image power-2 power-2))
246 (if resized-image (values resized-image width height))))))
250 (define (resize-surface surface width height)
251 (let ((old-width (surface-w surface)) (old-height (surface-h surface)))
252 (cond ((and (= width old-width) (= height old-height)) surface)
253 (else (let ((zoomx (/ (+ width 0.5) old-width)) (zoomy (/ (+ height 0.5) old-height)))
254 (zoomSurface surface zoomx zoomy 0))))))
256 (define* (load-texture-without-cache filename #:key (min-filter (texture-min-filter linear)) (mag-filter (texture-mag-filter linear)))
259 (image real-w real-h) (load-image-for-texture filename)
261 (let ((width (surface-w image)) (height (surface-h image))
262 (byteorder (if (= SDL_BYTEORDER SDL_LIL_ENDIAN)
263 (if (= (surface-format-BytesPerPixel image) 3) (ext-bgra bgr-ext) (ext-bgra bgra-ext))
264 (if (= (surface-format-BytesPerPixel image) 3) (pixel-format rgb) (pixel-format rgba))))
265 (texture-id (gl-generate-texture))
266 (image-pointer (make-pointer
267 (if (> (surface-pixels image) 0)
268 (surface-pixels image)
269 (+ ($expt 2 32) (surface-pixels image))))))
271 (gl-bind-texture (oes-framebuffer-object texture-2d) texture-id)
272 (set-gl-texture-image (oes-framebuffer-object texture-2d) 0 4 0 byteorder (data-type unsigned-byte) image-pointer width height)
273 (set-gl-texture-parameter (oes-framebuffer-object texture-2d) (texture-parameter-name texture-min-filter) min-filter)
274 (set-gl-texture-parameter (oes-framebuffer-object texture-2d) (texture-parameter-name texture-mag-filter) mag-filter)
275 (texture texture-id real-w real-h)))))))
277 (define load-texture (use-cache-with load-texture-without-cache))
282 (define current-color '(1 1 1 1))
284 (define (get-current-color)
287 (define* (set-current-color red green blue #:optional (alpha 1))
288 (set! current-color (list red green blue alpha))
289 (gl-color red green blue alpha))
291 (define-macro (with-color color . code)
293 (let ((original-color (get-current-color))
295 (apply set-current-color ,color)
296 (set! result (begin ,@code))
297 (apply set-current-color original-color)
299 (else (begin ,@code))))
301 (define (draw . vertexes)
303 (let ((number-of-points (length vertexes)))
304 (cond ((= number-of-points 2) (begin-mode lines))
305 ((= number-of-points 3) (begin-mode triangles))
306 ((= number-of-points 4) (begin-mode quads))
307 ((> number-of-points 4) (begin-mode polygon))))
308 (draw-vertexes vertexes)))
310 (define (draw-vertexes vertexes)
311 (cond ((not (null? vertexes))
312 (apply draw-vertex (if (list? (caar vertexes)) (car vertexes) (list (car vertexes))))
313 (draw-vertexes (cdr vertexes)))))
315 (define* (draw-vertex vertex #:key texture-coord)
316 (cond (texture-coord (apply gl-texture-coordinates texture-coord)))
317 (apply gl-vertex vertex))
319 (define* (draw-texture texture #:key (zoom 1) (sprite '((0 0) (1 1))))
321 (let ((width (texture-width texture))
322 (height (texture-height texture)))
323 (draw-rectangle (* zoom width (- (caadr sprite) (caar sprite)))
324 (* zoom height (- (cadadr sprite) (cadar sprite)))
326 #:texture-coord sprite)))))
328 (define* (draw-line length)
329 (let ((l (/ length 2)))
330 (draw (list 0 l) (list 0 (- l)))))
332 (define (draw-circle radius)
337 (let ((a (degrees-to-radians i)))
338 (draw-vertex (list (* radius (cos a)) (* radius (sin a))))))))
340 (define* (draw-quad v1 v2 v3 v4 #:key texture (texture-coord '((0 0) (1 1))))
343 (gl-bind-texture (oes-framebuffer-object texture-2d) (texture-id texture))
344 (draw (list v1 #:texture-coord (car texture-coord))
345 (list v2 #:texture-coord (list (caadr texture-coord) (cadar texture-coord)))
346 (list v3 #:texture-coord (cadr texture-coord))
347 (list v4 #:texture-coord (list (caar texture-coord) (cadadr texture-coord))))))
349 (draw v1 v2 v3 v4))))
351 (define* (draw-rectangle width height #:key texture texture-coord)
352 (let ((w (/ width 2)) (h (/ height 2)))
353 (draw-quad (list (- w) h 0)
358 #:texture-coord texture-coord)))
360 (define* (draw-square size #:key texture)
361 (draw-rectangle size size #:texture texture))
363 (define* (draw-cube #:key (size 1)
364 texture texture-1 texture-2 texture-3 texture-4 texture-5 texture-6
365 color-1 color-2 color-3 color-4 color-5 color-6)
366 (let ((-size (- size)))
369 (with-color color-1 (draw-quad (list -size size size) (list size size size) (list size -size size) (list -size -size size) #:texture (or texture-1 texture)))
371 (with-color color-2 (draw-quad (list -size -size -size) (list size -size -size) (list size size -size) (list -size size -size) #:texture (or texture-2 texture)))
373 (with-color color-3 (draw-quad (list size size size) (list -size size size) (list -size size -size) (list size size -size) #:texture (or texture-3 texture)))
375 (with-color color-4 (draw-quad (list -size -size size) (list size -size size) (list size -size -size) (list -size -size -size) #:texture (or texture-4 texture)))
377 (with-color color-5 (draw-quad (list size -size -size) (list size -size size) (list size size size) (list size size -size) #:texture (or texture-5 texture)))
379 (with-color color-6 (draw-quad (list -size -size size) (list -size -size -size) (list -size size -size) (list -size size size) #:texture (or texture-6 texture))))))
381 (define* (gtranslate x y #:optional (z 0))
382 (gl-translate x y z))
384 (define (grotate . rot)
386 (apply 3d-rotate rot))
388 (2d-rotate (car (last-pair rot))))))
390 (define (3d-rotate xrot yrot zrot)
391 (gl-rotate xrot 1 0 0)
392 (gl-rotate yrot 0 1 0)
393 (gl-rotate zrot 0 0 1))
395 (define (2d-rotate rot)
396 (gl-rotate rot 0 0 1))
400 (cond ((3d-mode?) (camera-look))))
405 ;; (define* (add-light #:key light position ambient (id GL_LIGHT1) (turn-on t))
407 ;; (and light (glLightfv id GL_DIFFUSE (car light) (cadr light) (caddr light) (cadddr light)))
408 ;; (and light position (glLightfv GL_POSITION (car position) (cadr position) (caddr position) (cadddr position)))
409 ;; (and ambient (glLightfv id GL_AMBIENT (car ambient) (cadr ambient) (caddr ambient) (cadddr ambient)))
410 ;; (and turn-on (gl-enable id))
416 (define camera-eye '(0 0 0))
417 (define camera-center '(0 0 -100))
418 (define camera-up '(0 1 0))
420 (define* (set-camera #:key eye center up)
421 (cond (eye (set! camera-eye eye)))
422 (cond (center (set! camera-center center)))
423 (cond (up (set! camera-up up))))
425 (define (camera-look)
426 (apply glu-look-at (append camera-eye camera-center camera-up)))
431 (define* (load-font-without-cache font-file #:key (size 40) (encoding ft_encoding_unicode))
432 (let ((font (ftglCreateTextureFont font-file size)))
433 (ftglSetFontFaceSize font size 72)
434 (ftglSetFontCharMap font encoding)
437 (define load-font (use-cache-with load-font-without-cache))
439 (define* (render-text text font #:key (size #f))
441 (cond ((not (= (ftglGetFontFaceSize font) size))
442 (ftglSetFontFaceSize font size 72))))
443 ((not (= (ftglGetFontFaceSize font) (font-size font)))
444 (ftglSetFontFaceSize font (font-size font) 72)))
445 (ftglRenderFont font text FTGL_RENDER_ALL))
451 (make-record-type "mesh"
452 '(draw translate turn rotate color inner-properties inner-property properties properties-set! property property-set!)
453 (lambda (record port)
454 (format port "#<mesh: ~a" (mesh-inner-property record 'type))
455 (for-each (lambda (x) (format port " ~a" x))
456 (mesh-properties record))
457 (display ">" port))))
459 (define mesh? (record-predicate mesh-type))
461 (define (make-mesh type proc)
463 (record-constructor mesh-type)
464 (let ((px 0) (py 0) (pz 0)
469 (let ((inner-properties
471 `((type . ,type) (color . ,color)
472 (x . ,px) (y . ,py) (z . ,pz)
473 (ax . ,ax) (ay . ,ay) (az . ,az)
474 (rx . ,rx) (ry . ,ry) (rz . ,rz)))))
480 (gtranslate px py pz)
482 (with-color color (proc properties))))
506 (assoc-ref (inner-properties) prop-name))
510 (lambda (new-properties)
512 (set! properties new-properties))
515 (assoc-ref properties prop-name))
516 (lambda (prop-name value)
518 (set! properties (assoc-set! properties prop-name value))))))))
520 (define (mesh-draw mesh)
521 (((record-accessor mesh-type 'draw) mesh)))
523 (define (mesh-inner-properties mesh)
524 (((record-accessor mesh-type 'inner-properties) mesh)))
526 (define (mesh-inner-property mesh prop-name)
527 (((record-accessor mesh-type 'inner-property) mesh) prop-name))
529 (define (mesh-properties mesh)
530 (((record-accessor mesh-type 'properties) mesh)))
532 (define (mesh-properties-set! mesh new-properties)
533 (((record-accessor mesh-type 'properties-set!) mesh) new-properties))
535 (define (mesh-property mesh prop-name)
536 (((record-accessor mesh-type 'property) mesh) prop-name))
538 (define (mesh-property-set! mesh prop-name value)
539 (((record-accessor mesh-type 'property-set!) mesh) prop-name value))
541 (define* (translate mesh x y #:optional (z 0))
542 (((record-accessor mesh-type 'translate) mesh) x y z)
545 (define (turn mesh . params)
546 (apply ((record-accessor mesh-type 'turn) mesh)
547 (if (>= (length params) 3)
549 (list 0 0 (car params))))
552 (define (rotate mesh . params)
553 (apply ((record-accessor mesh-type 'rotate) mesh)
554 (if (>= (length params) 3)
556 (list 0 0 (car params))))
559 (define (color mesh c)
560 (((record-accessor mesh-type 'color) mesh) c)
566 (define (mesh-join . meshes)
570 (for-each (lambda (m) (with-gl-push-matrix (mesh-draw m))) meshes))))
575 (define-macro (primitive header . body)
576 (let* ((type (car header))
578 (list-args (names-arguments args)))
583 (apply (lambda* ,(cons #:key list-args) ,@body)
585 ,@(let get-params ((l list-args))
586 (cond ((null? l) '())
588 (cons (symbol->keyword (car l))
589 (cons `(assoc-ref props ',(car l))
590 (get-params (cdr l)))))))))))))
591 (mesh-properties-set! m (list ,@(map (lambda (a) `(cons ',a ,a)) list-args)))
594 (define-macro (define-primitive header . body)
595 `(define ,(car header) (primitive ,header ,@body)))
598 ;;; Primitives definition
600 (define-primitive (square size #:key texture)
601 (draw-square size #:texture texture))
603 (define-primitive (rectangle width height #:key texture texture-coord)
604 (draw-rectangle width height #:texture texture #:texture-coord texture-coord))
606 (define-primitive (circle radius)
607 (draw-circle radius))
609 (define-primitive (picture filename #:key (min-filter (texture-min-filter linear)) (mag-filter (texture-mag-filter linear)) (zoom 1) (sprite '((0 0) (1 1))))
610 (draw-texture (load-texture filename #:min-filter min-filter #:mag-filter mag-filter) #:zoom zoom #:sprite sprite))
613 (module-map (lambda (sym var)
614 (if (not (eq? sym '%module-public-interface))
615 (module-export! (current-module) (list sym))))