X-Git-Url: https://git.jsancho.org/?p=gacela.git;a=blobdiff_plain;f=src%2Fvideo.scm;h=0b49679605ce0e2082ee15da3cea7b0b8dad442c;hp=d12e5ecd532f8df768e9111cc329c6a108a0929c;hb=525f2b2cd2b56afe6eca25a67ebb93eed3f69403;hpb=437150d98d8bb5c833cba657f296152762586436

diff --git a/src/video.scm b/src/video.scm
index d12e5ec..0b49679 100644
--- a/src/video.scm
+++ b/src/video.scm
@@ -17,29 +17,43 @@
 
 (define-module (gacela video)
   #:use-module (gacela sdl)
-  #:use-module (gacela gl)
+;  #:use-module (gacela gl)
+  #:use-module (figl gl)
+  #:use-module (figl glu)
   #:use-module (gacela ftgl)
+  #:use-module (gacela math)
+  #:use-module (gacela utils)
   #:use-module (ice-9 optargs)
   #:use-module (ice-9 receive)
   #:export (init-video
 	    get-screen-height
 	    get-screen-width
 	    get-screen-bpp
+	    set-screen-bpp!
 	    resize-screen
 	    quit-video
 	    clear-screen
 	    flip-screen
+	    set-screen-title!
+	    get-screen-title
 	    set-2d-mode
 	    set-3d-mode
 	    3d-mode?
+	    get-frames-per-second
+	    set-frames-per-second!
+	    get-fullscreen
+	    set-fullscreen!
+	    init-frame-time
+	    get-frame-time
+	    delay-frame
 	    get-current-color
 	    set-current-color
 	    with-color
 	    progn-textures
 	    draw
-	    load-image
-	    resize-surface
 	    load-texture
+	    load-texture-without-cache
+	    get-texture-properties
 	    draw-texture
 	    draw-line
 	    draw-quad
@@ -53,93 +67,108 @@
 	    set-camera
 	    camera-look
 	    load-font
-	    render-text))
+	    load-font-without-texture
+	    render-text)
+  #:re-export (with-gl-push-matrix))
+
 
 
 ;;; Screen
 
-(define init-video #f)
-(define get-screen-height #f)
-(define get-screen-width #f)
-(define get-screen-bpp #f)
-(define resize-screen #f)
-(define quit-video #f)
-
-(let ((screen #f) (flags 0))
-  (set! init-video
-	(lambda* (width height bpp #:key (mode '2d) (title ""))
-	  (cond ((not screen)
-		 (SDL_Init SDL_INIT_VIDEO)
-		 (let ((info (SDL_GetVideoInfo)))
-		   (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
-		   (set! flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
-				  (if (= (assoc-ref info 'hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
-				  (if (= (assoc-ref info 'blit_hw) 0) 0 SDL_HWACCEL)))
-		   (set! screen (SDL_SetVideoMode width height bpp flags))
-		   (SDL_WM_SetCaption title "")
-		   (init-gl)
-		   (if (eq? mode '3d) (set-3d-mode) (set-2d-mode))))
-		(else #t))))
-
-  (set! get-screen-height
-	(lambda ()
-	  (surface-h screen)))
-
-  (set! get-screen-width
-	(lambda ()
-	  (surface-w screen)))
-
-  (set! get-screen-bpp
-	(lambda ()
-	  (surface-format-BytesPerPixel screen)))
-
-  (set! resize-screen
-	(lambda (width height)
-	  (cond (screen
-		 (set! screen (SDL_SetVideoMode width height (get-screen-bpp) flags))
-		 (resize-screen-GL width height)))))
-
-  (set! quit-video
-	(lambda ()
-	  (SDL_FreeSurface screen)
-	  (set! screen #f)
-	  (SDL_Quit))))
+(define screen #f)
+(define flags 0)
+
+(define* (init-video width height bpp #:key (mode '2d) (title "") (fps 20) (fullscreen 'off))
+  (SDL_Init SDL_INIT_VIDEO)
+  (let ((info (SDL_GetVideoInfo)))
+    (SDL_GL_SetAttribute SDL_GL_DOUBLEBUFFER 1)
+    (set! flags (+ SDL_OPENGL SDL_GL_DOUBLEBUFFER SDL_HWPALETTE SDL_RESIZABLE
+		   (if (= (assoc-ref info 'hw_available) 0) SDL_SWSURFACE SDL_HWSURFACE)
+		   (if (= (assoc-ref info 'blit_hw) 0) 0 SDL_HWACCEL)
+		   (if (eq? fullscreen 'on) SDL_FULLSCREEN 0)))
+    (set! screen (SDL_SetVideoMode width height bpp flags))
+    (set-screen-title! title)
+    (set-frames-per-second! fps)
+    (set-fullscreen! fullscreen #f)
+    (init-gl)
+    (if (eq? mode '3d) (set-3d-mode) (set-2d-mode))))
+
+(define (get-screen-height)
+  (surface-h screen))
+
+(define (get-screen-width)
+  (surface-w screen))
+
+(define (get-screen-bpp)
+  (* (surface-format-BytesPerPixel screen) 8))
+
+(define (set-screen-bpp! bpp)
+  (cond (screen
+	 (set! screen (SDL_SetVideoMode (get-screen-width) (get-screen-height) (get-screen-bpp) flags)))))
+
+(define (resize-screen width height)
+  (cond (screen
+	 (set! screen (SDL_SetVideoMode width height (get-screen-bpp) flags))
+	 (resize-screen-GL width height))))
+
+(define (quit-video)
+  (cond (screen
+	 (SDL_FreeSurface screen)
+	 (set! screen #f)
+	 (SDL_Quit))))
 
 (define (clear-screen)
-  (glClear (+ GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT)))
+  (gl-clear (clear-buffer-mask color-buffer depth-buffer)))
 
 (define (flip-screen)
   (SDL_GL_SwapBuffers))
 
 
-(define set-2d-mode #f)
-(define set-3d-mode #f)
-(define 3d-mode? #f)
+(define screen-title "")
+
+(define (set-screen-title! title)
+  (set! screen-title title)
+  (SDL_WM_SetCaption title ""))
+
+(define (get-screen-title)
+  screen-title)
+
+
+(define mode '2d)
+
+(define (set-2d-mode)
+  (set! mode '2d)
+  (gl-disable depth-test)
+  (resize-screen-GL (get-screen-width) (get-screen-height)))
+
+(define (set-3d-mode)
+  (set! mode '3d)
+  (sel-gl-clear-depth 1)
+  (gl-enable depth-test)
+  (set-gl-depth-function lequal)
+  (resize-screen-GL (get-screen-width) (get-screen-height)))
+
+(define (3d-mode?)
+  (eq? mode '3d))
 
-(let ((mode '2d))
-  (set! set-2d-mode
-	(lambda ()
-	  (set! mode '2d)
-	  (glDisable GL_DEPTH_TEST)
-	  (resize-screen-GL (get-screen-width) (get-screen-height))))
 
-  (set! set-3d-mode
-	(lambda ()
-	  (set! mode '3d)
-	  (glClearDepth 1)
-	  (glEnable GL_DEPTH_TEST)
-	  (glDepthFunc GL_LEQUAL)
-	  (resize-screen-GL (get-screen-width) (get-screen-height))))
+(define fullscreen 'off)
 
-  (set! 3d-mode?
-	(lambda ()
-	  (eq? mode '3d))))
+(define* (set-fullscreen! fs #:optional (toggle #t))
+  (cond ((or (and (eq? fullscreen 'on) (eq? fs 'off))
+	     (and (eq? fullscreen 'off) (eq? fs 'on)))
+	 (set! fullscreen fs)
+	 (cond (toggle
+		(SDL_WM_ToggleFullScreen screen))))))
+
+(define (get-fullscreen)
+  fullscreen)
 
 
 (define (init-gl)
-  (glShadeModel GL_SMOOTH)
+  (set-gl-shade-model GL_SMOOTH)
   (glClearColor 0 0 0 0)
-  (glEnable GL_BLEND)
+  (gl-enable GL_BLEND)
   (glBlendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA)
   (glHint GL_PERSPECTIVE_CORRECTION_HINT GL_NICEST))
 
@@ -157,36 +186,57 @@
   (glLoadIdentity))
 
 
+;;; Frames per second
+
+(define time 0)
+(define frames-per-second 20)
+(define time-per-frame 50)   ;in ms
+
+(define (get-frames-per-second)
+  frames-per-second)
+
+(define (set-frames-per-second! fps)
+  (set! frames-per-second fps)
+  (set! time-per-frame (/ 1000.0 fps)))
+
+(define (init-frame-time)
+  (set! time (SDL_GetTicks)))
+
+(define (get-frame-time)
+  time)
+
+(define (delay-frame)
+  (let ((frame-time (- (SDL_GetTicks) time)))
+    (cond ((< frame-time time-per-frame)
+	   (SDL_Delay (- time-per-frame frame-time))))))
+
+
 ;;; Drawing
 
-(define get-current-color #f)
-(define set-current-color #f)
+(define current-color '(1 1 1 1))
 
-(let ((current-color '(1 1 1 1)))
-  (set! get-current-color
-	(lambda ()
-	  current-color))
+(define (get-current-color)
+  current-color)
 
-  (set! set-current-color
-	(lambda* (red green blue #:optional (alpha 1))
-	  (set! current-color (list red green blue alpha))
-	  (glColor4f red green blue alpha))))
+(define* (set-current-color red green blue #:optional (alpha 1))
+  (set! current-color (list red green blue alpha))
+  (glColor4f red green blue alpha))
 
 (define-macro (with-color color . code)
-  (cond (color
-	 `(let ((original-color (get-current-color))
+  `(cond (,color
+	  (let ((original-color (get-current-color))
 		(result #f))
 	    (apply set-current-color ,color)
 	    (set! result (begin ,@code))
 	    (apply set-current-color original-color)
 	    result))
-	(else `(begin ,@code))))
+	 (else (begin ,@code))))
 
 (define-macro (progn-textures . code)
   `(let ((result #f))
-     (glEnable GL_TEXTURE_2D)
+     (gl-enable GL_TEXTURE_2D)
      (set! result (begin ,@code))
-     (glDisable GL_TEXTURE_2D)
+     (gl-disable GL_TEXTURE_2D)
      result))
 
 (define (draw . vertexes)
@@ -197,7 +247,8 @@
 (define (begin-draw number-of-points)
   (cond ((= number-of-points 2) (glBegin GL_LINES))
 	((= number-of-points 3) (glBegin GL_TRIANGLES))
-	((= number-of-points 4) (glBegin GL_QUADS))))
+	((= number-of-points 4) (glBegin GL_QUADS))
+	((> number-of-points 4) (glBegin GL_POLYGON))))
 
 (define (draw-vertexes vertexes)
   (cond ((not (null? vertexes))
@@ -205,12 +256,8 @@
 	 (draw-vertexes (cdr vertexes)))))
 
 (define* (draw-vertex vertex #:key texture-coord)
-  (cond ((list? (car vertex))
-	 (with-color (car vertex)
-		     (apply simple-draw-vertex (cadr vertex))))
-	(else
-	 (cond (texture-coord (apply glTexCoord2f texture-coord)))
-	 (apply simple-draw-vertex vertex))))
+  (cond (texture-coord (apply glTexCoord2f texture-coord)))
+  (apply simple-draw-vertex vertex))
 
 (define* (simple-draw-vertex x y #:optional (z 0))
   (cond ((3d-mode?) (glVertex3f x y z))
@@ -222,7 +269,6 @@
 	   (SDL_DisplayFormatAlpha image)))))
   
 (define (load-image-for-texture filename)
-  (init-sdl)
   (let ((image (load-image filename)))
     (cond (image
 	   (let* ((width (surface-w image)) (height (surface-h image))
@@ -240,95 +286,101 @@
 	  (else (let ((zoomx (/ (+ width 0.5) old-width)) (zoomy (/ (+ height 0.5) old-height)))
 	       (zoomSurface surface zoomx zoomy 0))))))
 
-(define* (load-texture filename #:key (min-filter GL_LINEAR) (mag-filter GL_LINEAR))
-  (let* ((key (list filename min-filter mag-filter))
-	 (res (get-resource-from-cache key)))
-    (cond (res res)
-	  (else
-	   (progn-textures
-	    (receive
-	     (image real-w real-h) (load-image-for-texture filename)
-	     (cond (image
-		    (let ((width (surface-w image)) (height (surface-h image))
-			  (byteorder (if (= SDL_BYTEORDER SDL_LIL_ENDIAN)
-					 (if (= (surface-format-BytesPerPixel image) 3) GL_BGR GL_BGRA)
-					 (if (= (surface-format-BytesPerPixel image) 3) GL_RGB GL_RGBA)))
-			  (texture (car (glGenTextures 1))))
-
-		      (glBindTexture GL_TEXTURE_2D texture)
-		      (glTexImage2D GL_TEXTURE_2D 0 4 width height 0 byteorder GL_UNSIGNED_BYTE (surface-pixels image))
-		      (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER min-filter)
-		      (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER mag-filter)
-		      (set-texture-size! texture real-w real-h)
-		      (insert-resource-into-cache key texture)
-		      texture)))))))))
-
-(define* (draw-texture texture #:optional (zoom 1))
+(define* (load-texture-without-cache filename #:key (min-filter GL_LINEAR) (mag-filter GL_LINEAR))
+  (progn-textures
+   (receive
+    (image real-w real-h) (load-image-for-texture filename)
+    (cond (image
+	   (let ((width (surface-w image)) (height (surface-h image))
+		 (byteorder (if (= SDL_BYTEORDER SDL_LIL_ENDIAN)
+				(if (= (surface-format-BytesPerPixel image) 3) GL_BGR GL_BGRA)
+				(if (= (surface-format-BytesPerPixel image) 3) GL_RGB GL_RGBA)))
+		 (texture (car (glGenTextures 1))))
+
+	     (glBindTexture GL_TEXTURE_2D texture)
+	     (glTexImage2D GL_TEXTURE_2D 0 4 width height 0 byteorder GL_UNSIGNED_BYTE (surface-pixels image))
+	     (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER min-filter)
+	     (glTexParameteri GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER mag-filter)
+	     (set-texture-size! texture real-w real-h)
+	     texture))))))
+
+(define load-texture (use-cache-with load-texture-without-cache))
+
+(define (get-texture-properties texture)
+  `((width . ,(texture-w texture)) (height . ,(texture-h texture))))
+
+(define* (draw-texture texture #:key (zoom 1) (sprite '((0 0) (1 1))))
   (cond (texture
 	 (let ((width (texture-w texture))
 	       (height (texture-h texture)))
-	   (draw-rectangle (* zoom width) (* zoom height) #:texture texture)))))
+	   (draw-rectangle (* zoom width (- (caadr sprite) (caar sprite)))
+			   (* zoom height (- (cadadr sprite) (cadar sprite)))
+			   #:texture texture
+			   #:texture-coord sprite)))))
 
-(define* (draw-line length #:optional color)
+(define* (draw-line length)
   (let ((l (/ length 2)))
-    (cond (color
-	   (with-color color (draw (list 0 l) (list 0 (- l)))))
-	  (else
-	   (draw (list 0 l) (list 0 (- l)))))))
+    (draw (list 0 l) (list 0 (- l)))))
+
+(define (draw-circle radius)
+  (glBegin GL_POLYGON)
+  (do ((i 0 (1+ i)))
+      ((>= i 360))
+    (let ((a (degrees-to-radians i)))
+      (draw-vertex (list (* radius (cos a)) (* radius (sin a))))))
+  (glEnd))
 
-(define* (draw-quad v1 v2 v3 v4 #:key texture color)
+(define* (draw-quad v1 v2 v3 v4 #:key texture (texture-coord '((0 0) (1 1))))
   (cond (texture
 	 (progn-textures
 	  (glBindTexture GL_TEXTURE_2D texture)
 	  (begin-draw 4)
-	  (draw-vertex v1 #:texture-coord '(0 0))
-	  (draw-vertex v2 #:texture-coord '(1 0))
-	  (draw-vertex v3 #:texture-coord '(1 1))
-	  (draw-vertex v4 #:texture-coord '(0 1))
+	  (draw-vertex v1 #:texture-coord (car texture-coord))
+	  (draw-vertex v2 #:texture-coord (list (caadr texture-coord) (cadar texture-coord)))
+	  (draw-vertex v3 #:texture-coord (cadr texture-coord))
+	  (draw-vertex v4 #:texture-coord (list (caar texture-coord) (cadadr texture-coord)))
 	  (glEnd)))
-	(color
-	 (with-color color (draw v1 v2 v3 v4)))
 	(else
 	 (draw v1 v2 v3 v4))))
 
-(define* (draw-rectangle width height #:key texture color)
+(define* (draw-rectangle width height #:key texture texture-coord)
   (let ((w (/ width 2)) (h (/ height 2)))
     (draw-quad (list (- w) h 0)
 	       (list w h 0)
 	       (list w (- h) 0)
 	       (list (- w) (- h) 0)
 	       #:texture texture
-	       #:color color)))
+	       #:texture-coord texture-coord)))
 
-(define* (draw-square #:key (size 1) texture color)
-  (draw-rectangle size size #:texture texture #:color color))
+(define* (draw-square size #:key texture)
+  (draw-rectangle size size #:texture texture))
 
 (define* (draw-cube #:key (size 1)
 		   texture texture-1 texture-2 texture-3 texture-4 texture-5 texture-6
-		   color color-1 color-2 color-3 color-4 color-5 color-6)
+		   color-1 color-2 color-3 color-4 color-5 color-6)
   (let ((-size (- size)))
     (progn-textures
      (glNormal3f 0 0 1)
-     (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))
+     (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)))
      (glNormal3f 0 0 -1)
-     (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))
+     (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)))
      (glNormal3f 0 1 0)
-     (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))
+     (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)))
      (glNormal3f 0 -1 0)
-     (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))
+     (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)))
      (glNormal3f 1 0 0)
-     (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))
+     (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)))
      (glNormal3f -1 0 0)
-     (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)))))
+     (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))))))
 
-(define* (translate x y #:optional (z 0))
+(define* (gtranslate x y #:optional (z 0))
   (glTranslatef x y z))
 
-(define* (rotate #:rest rot)
+(define (grotate . rot)
   (cond ((3d-mode?)
 	 (apply 3d-rotate rot))
 	(else
-	 (apply 2d-rotate rot))))
+	 (2d-rotate (car (last-pair rot))))))
 
 (define (3d-rotate xrot yrot zrot)
   (glRotatef xrot 1 0 0)
@@ -345,44 +397,215 @@
 
 ;;; Lights
 
-(define* (add-light #:key light position ambient (id GL_LIGHT1) (turn-on t))
-  (init-lighting)
-  (and light (glLightfv id GL_DIFFUSE (first light) (second light) (third light) (fourth light)))
-  (and light position (glLightfv GL_POSITION (first position) (second position) (third position) (fourth position)))
-  (and ambient (glLightfv id GL_AMBIENT (first ambient) (second ambient) (third ambient) (fourth ambient)))
-  (and turn-on (glEnable id))
-  id)
+;; (define* (add-light #:key light position ambient (id GL_LIGHT1) (turn-on t))
+;;   (init-lighting)
+;;   (and light (glLightfv id GL_DIFFUSE (car light) (cadr light) (caddr light) (cadddr light)))
+;;   (and light position (glLightfv GL_POSITION (car position) (cadr position) (caddr position) (cadddr position)))
+;;   (and ambient (glLightfv id GL_AMBIENT (car ambient) (cadr ambient) (caddr ambient) (cadddr ambient)))
+;;   (and turn-on (gl-enable id))
+;;   id)
 
 
 ;;; Camera
 
-(define set-camera #f)
-(define camera-look #f)
+(define camera-eye '(0 0 0))
+(define camera-center '(0 0 -100))
+(define camera-up '(0 1 0))
 
-(let ((camera-eye '(0 0 0)) (camera-center '(0 0 -100)) (camera-up '(0 1 0)))
-  (set! set-camera
-	(lambda* (#:key eye center up)
-	  (cond (eye (set! camera-eye eye)))
-	  (cond (center (set! camera-center center)))
-	  (cond (up (set! camera-up up)))))
+(define* (set-camera #:key eye center up)
+  (cond (eye (set! camera-eye eye)))
+  (cond (center (set! camera-center center)))
+  (cond (up (set! camera-up up))))
 
-  (set! camera-look
-	(lambda ()
-	  (apply gluLookAt (append camera-eye camera-center camera-up)))))
+(define (camera-look)
+  (apply gluLookAt (append camera-eye camera-center camera-up)))
 
 
 ;;; Text and fonts
 
-(define* (load-font font-file #:key (size 40) (encoding ft_encoding_unicode))
-  (let* ((key (list font-file))
-	 (font (get-resource-from-cache key)))
-    (cond ((not font)
-	   (set! font (ftglCreateTextureFont font-file))
-	   (insert-resource-into-cache key font)))
+(define* (load-font-without-cache font-file #:key (size 40) (encoding ft_encoding_unicode))
+  (let ((font (ftglCreateTextureFont font-file size)))
     (ftglSetFontFaceSize font size 72)
     (ftglSetFontCharMap font encoding)
     font))
 
+(define load-font (use-cache-with load-font-without-cache))
+
 (define* (render-text text font #:key (size #f))
-  (cond (size (ftglSetFontFaceSize font size 72)))
+  (cond (size
+	 (cond ((not (= (ftglGetFontFaceSize font) size))
+		(ftglSetFontFaceSize font size 72))))
+	((not (= (ftglGetFontFaceSize font) (font-size font)))
+	 (ftglSetFontFaceSize font (font-size font) 72)))
   (ftglRenderFont font text FTGL_RENDER_ALL))
+
+
+;;; Meshes
+
+(define mesh-type
+  (make-record-type "mesh" 
+ 		    '(draw translate turn rotate color inner-properties inner-property properties properties-set! property property-set!)
+ 		    (lambda (record port)
+ 		      (format port "#<mesh: ~a" (mesh-inner-property record 'type))
+ 		      (for-each (lambda (x) (format port " ~a" x))
+ 				(mesh-properties record))
+ 		      (display ">" port))))
+
+(define mesh? (record-predicate mesh-type))
+
+(define* (make-mesh type proc)
+  (apply
+   (record-constructor mesh-type)
+   (let ((px 0) (py 0) (pz 0)
+ 	 (ax 0) (ay 0) (az 0)
+ 	 (rx 0) (ry 0) (rz 0)
+	 (color #f)
+ 	 (properties '()))
+     (let ((inner-properties
+ 	    (lambda ()
+ 	      `((type . ,type) (color . ,color)
+		(x . ,px) (y . ,py) (z . ,pz)
+		(ax . ,ax) (ay . ,ay) (az . ,az)
+		(rx . ,rx) (ry . ,ry) (rz . ,rz)))))
+       (list
+ 	(lambda ()
+ 	  "draw"
+ 	  (glmatrix-block
+ 	   (grotate ax ay az)
+ 	   (gtranslate px py pz)
+ 	   (grotate rx ry rz)
+	   (with-color color (proc properties))))
+ 	(lambda (x y z)
+ 	  "translate"
+ 	  (set! px (+ px x))
+ 	  (set! py (+ py y))
+ 	  (set! pz (+ pz z)))
+ 	(lambda (x y z)
+ 	  "turn"
+ 	  (set! ax (+ ax x))
+ 	  (set! ay (+ ay y))
+ 	  (set! az (+ az z)))
+ 	(lambda (x y z)
+ 	  "rotate"
+ 	  (set! rx (+ rx x))
+ 	  (set! ry (+ ry y))
+ 	  (set! rz (+ rz z)))
+	(lambda (c)
+	  "color"
+	  (set! color c))
+ 	(lambda ()
+ 	  "inner-properties"
+ 	  (inner-properties))
+ 	(lambda (prop-name)
+ 	  "inner-property"
+ 	  (assoc-ref (inner-properties) prop-name))
+ 	(lambda ()
+ 	  "properties"
+ 	  properties)
+ 	(lambda (new-properties)
+ 	  "properties-set!"
+ 	  (set! properties new-properties))
+ 	(lambda (prop-name)
+ 	  "property"
+ 	  (assoc-ref properties prop-name))
+ 	(lambda (prop-name value)
+ 	  "property-set!"
+ 	  (set! properties (assoc-set! properties prop-name value))))))))
+
+(define (mesh-draw mesh)
+  (((record-accessor mesh-type 'draw) mesh)))
+
+(define (mesh-inner-properties mesh)
+  (((record-accessor mesh-type 'inner-properties) mesh)))
+
+(define (mesh-inner-property mesh prop-name)
+  (((record-accessor mesh-type 'inner-property) mesh) prop-name))
+
+(define (mesh-properties mesh)
+  (((record-accessor mesh-type 'properties) mesh)))
+
+(define (mesh-properties-set! mesh new-properties)
+  (((record-accessor mesh-type 'properties-set!) mesh) new-properties))
+
+(define (mesh-property mesh prop-name)
+  (((record-accessor mesh-type 'property) mesh) prop-name))
+
+(define (mesh-property-set! mesh prop-name value)
+  (((record-accessor mesh-type 'property-set!) mesh) prop-name value))
+
+(define* (translate mesh x y #:optional (z 0))
+  (((record-accessor mesh-type 'translate) mesh) x y z)
+  mesh)
+
+(define (turn mesh . params)
+  (apply ((record-accessor mesh-type 'turn) mesh)
+ 	 (if (>= (length params) 3)
+ 	     params
+ 	     (list 0 0 (car params))))
+  mesh)
+
+(define (rotate mesh . params)
+  (apply ((record-accessor mesh-type 'rotate) mesh)
+ 	 (if (>= (length params) 3)
+ 	     params
+ 	     (list 0 0 (car params))))
+  mesh)
+
+(define (color mesh c)
+  (((record-accessor mesh-type 'color) mesh) c)
+  mesh)
+
+
+;;; Advanced meshes
+
+(define (mesh-join . meshes)
+  (make-mesh
+   'joined-meshes
+   (lambda (props)
+     (for-each (lambda (m) (glmatrix-block (mesh-draw m))) meshes))))
+
+
+;;; Primitives
+
+(define-macro (primitive header . body)
+  (let* ((type (car header))
+	 (args (cdr header))
+	 (list-args (names-arguments args)))
+    `(lambda* ,args
+       (let ((m (make-mesh
+		 ',type
+		 (lambda (props)
+		   (apply (lambda* ,(cons #:key list-args) ,@body)
+			  (list
+			   ,@(let get-params ((l list-args))
+			       (cond ((null? l) '())
+				     (else
+				      (cons (symbol->keyword (car l))
+					    (cons `(assoc-ref props ',(car l))
+						  (get-params (cdr l)))))))))))))
+	 (mesh-properties-set! m (list ,@(map (lambda (a) `(cons ',a ,a)) list-args)))
+	 m))))
+
+(define-macro (define-primitive header . body)
+  `(define ,(car header) (primitive ,header ,@body)))
+
+
+;;; Primitives definition
+
+(define-primitive (square size #:key texture)
+  (draw-square size #:texture texture))
+
+(define-primitive (rectangle width height #:key texture texture-coord)
+  (draw-rectangle width height #:texture texture #:texture-coord texture-coord))
+
+(define-primitive (circle radius)
+  (draw-circle radius))
+
+(define-primitive (picture filename #:key (min-filter GL_LINEAR) (mag-filter GL_LINEAR) (zoom 1) (sprite '((0 0) (1 1))))
+  (draw-texture (load-texture filename #:min-filter min-filter #:mag-filter mag-filter) #:zoom zoom #:sprite sprite))
+
+
+(module-map (lambda (sym var)
+	      (if (not (eq? sym '%module-public-interface))
+		  (module-export! (current-module) (list sym))))
+	    (current-module))
\ No newline at end of file