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 (ice-9 optargs)
23 #:use-module (ice-9 receive)
46 (define get-current-color #f)
47 (define set-current-color #f)
49 (let ((current-color '(1 1 1 1)))
50 (set! get-current-color
54 (set! set-current-color
55 (lambda* (red green blue #:optional (alpha 1))
56 (set! current-color (list red green blue alpha))
57 (glColor4f red green blue alpha))))
59 (define-macro (with-color color . code)
61 `(let ((original-color (get-current-color))
63 (apply set-current-color ,color)
64 (set! result (begin ,@code))
65 (apply set-current-color original-color)
67 (else `(begin ,@code))))
69 (define-macro (progn-textures . code)
71 (glEnable GL_TEXTURE_2D)
72 (set! result (begin ,@code))
73 (glDisable GL_TEXTURE_2D)
76 (define (draw . vertexes)
77 (begin-draw (length vertexes))
78 (draw-vertexes vertexes)
81 (define (begin-draw number-of-points)
82 (cond ((= number-of-points 2) (glBegin GL_LINES))
83 ((= number-of-points 3) (glBegin GL_TRIANGLES))
84 ((= number-of-points 4) (glBegin GL_QUADS))))
86 (define (draw-vertexes vertexes)
87 (cond ((not (null? vertexes))
88 (draw-vertex (car vertexes))
89 (draw-vertexes (cdr vertexes)))))
91 (define* (draw-vertex vertex #:key texture-coord)
92 (cond ((list? (car vertex))
93 (with-color (car vertex)
94 (apply simple-draw-vertex (cadr vertex))))
96 (cond (texture-coord (apply glTexCoord2f texture-coord)))
97 (apply simple-draw-vertex vertex))))
99 (define* (simple-draw-vertex x y #:optional (z 0))
100 (cond ((3d-mode?) (glVertex3f x y z))
101 (else (glVertex2f x y))))
103 (define (load-image filename)
104 (let ((image (IMG_Load filename)))
106 (SDL_DisplayFormatAlpha image)))))
108 (define (load-image-for-texture filename)
110 (let ((image (load-image filename)))
112 (let* ((width (surface-w image)) (height (surface-h image))
113 (power-2 (nearest-power-of-two (min width height)))
115 (cond ((and (= width power-2) (= height power-2)) (values image width height))
116 (else (set! resized-image (resize-surface image power-2 power-2))
117 (if resized-image (values resized-image width height))))))
121 (define (resize-surface surface width height)
122 (let ((old-width (surface-w surface)) (old-height (surface-h surface)))
123 (cond ((and (= width old-width) (= height old-height)) surface)
124 (else (let ((zoomx (/ (+ width 0.5) old-width)) (zoomy (/ (+ height 0.5) old-height)))
125 (zoomSurface surface zoomx zoomy 0))))))
127 (define* (load-texture filename #:key (min-filter GL_LINEAR) (mag-filter GL_LINEAR))
128 (let* ((key (list filename min-filter mag-filter))
129 (res (get-resource-from-cache key)))
134 (image real-w real-h) (load-image-for-texture filename)
136 (let ((width (surface-w image)) (height (surface-h image))
137 (byteorder (if (= SDL_BYTEORDER SDL_LIL_ENDIAN)
138 (if (= (surface-format-BytesPerPixel image) 3) GL_BGR GL_BGRA)
139 (if (= (surface-format-BytesPerPixel image) 3) GL_RGB GL_RGBA)))
140 (texture (car (glGenTextures 1))))
142 (glBindTexture GL_TEXTURE_2D texture)
143 (glTexImage2D GL_TEXTURE_2D 0 4 width height 0 byteorder GL_UNSIGNED_BYTE (surface-pixels image))
144 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER min-filter)
145 (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER mag-filter)
146 (set-texture-size! texture real-w real-h)
147 (insert-resource-into-cache key texture)
150 ;; (define* (draw-image filename #:optional (zoom 1))
151 ;; (let ((texture (load-texture filename)))
152 ;; (cond (texture (draw-texture texture zoom)))))
154 (define* (draw-texture texture #:optional (zoom 1))
156 (let ((width (texture-w texture))
157 (height (texture-h texture)))
158 (draw-rectangle (* zoom width) (* zoom height) #:texture texture)))))
160 (define* (draw-line length #:optional color)
161 (let ((l (/ length 2)))
163 (with-color color (draw (list 0 l) (list 0 (- l)))))
165 (draw (list 0 l) (list 0 (- l)))))))
167 (define* (draw-quad v1 v2 v3 v4 #:key texture color)
170 (glBindTexture GL_TEXTURE_2D texture)
172 (draw-vertex v1 #:texture-coord '(0 0))
173 (draw-vertex v2 #:texture-coord '(1 0))
174 (draw-vertex v3 #:texture-coord '(1 1))
175 (draw-vertex v4 #:texture-coord '(0 1))
178 (with-color color (draw v1 v2 v3 v4)))
180 (draw v1 v2 v3 v4))))
182 (define* (draw-rectangle width height #:key texture color)
183 (let ((w (/ width 2)) (h (/ height 2)))
184 (draw-quad (list (- w) h 0)
191 (define* (draw-square #:key (size 1) texture color)
192 (draw-rectangle size size #:texture texture #:color color))
194 (define* (draw-cube #:key (size 1)
195 texture texture-1 texture-2 texture-3 texture-4 texture-5 texture-6
196 color color-1 color-2 color-3 color-4 color-5 color-6)
197 (let ((-size (- size)))
200 (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))
202 (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))
204 (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))
206 (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))
208 (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))
210 (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)))))
212 (define* (add-light #:key light position ambient (id GL_LIGHT1) (turn-on t))
214 (and light (glLightfv id GL_DIFFUSE (first light) (second light) (third light) (fourth light)))
215 (and light position (glLightfv GL_POSITION (first position) (second position) (third position) (fourth position)))
216 (and ambient (glLightfv id GL_AMBIENT (first ambient) (second ambient) (third ambient) (fourth ambient)))
217 (and turn-on (glEnable id))
220 (define* (translate x y #:optional (z 0))
221 (glTranslatef x y z))
223 (define* (rotate #:rest rot)
224 (cond ((3d-mode?) (apply 3d-rotate rot))
225 (else (apply 2d-rotate rot))))
227 (define (3d-rotate xrot yrot zrot)
228 (glRotatef xrot 1 0 0)
229 (glRotatef yrot 0 1 0)
230 (glRotatef zrot 0 0 1))
232 (define (2d-rotate rot)
233 (glRotatef rot 0 0 1))
237 (cond ((3d-mode?) (camera-look))))
239 (define set-camera #f)
240 (define camera-look #f)
242 (let ((camera-eye '(0 0 0)) (camera-center '(0 0 -100)) (camera-up '(0 1 0)))
244 (lambda* (#:key eye center up)
245 (cond (eye (set! camera-eye eye)))
246 (cond (center (set! camera-center center)))
247 (cond (up (set! camera-up up)))))
251 (apply gluLookAt (append camera-eye camera-center camera-up)))))
256 (define* (load-font font-file #:key (size 40) (encoding ft_encoding_unicode))
257 (let* ((key (list font-file))
258 (font (get-resource-from-cache key)))
260 (set! font (ftglCreateTextureFont font-file))
261 (insert-resource-into-cache key font)))
262 (ftglSetFontFaceSize font size 72)
263 (ftglSetFontCharMap font encoding)
266 (define* (render-text text font #:key (size #f))
267 (cond (size (ftglSetFontFaceSize font size 72)))
268 (ftglRenderFont font text FTGL_RENDER_ALL))