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|
;;
;; 3-D gear wheels. This program is in the public domain.
;;
;; Brian Paul
;;
;; Conversion to GLUT by Mark J. Kilgard
;; Conversion to GtkGLExt by Naofumi Yasufuku
;; Port to Scheme by Shiro Kawai
(use math.const)
(use gtk)
(use gtk.gtkgl)
(use gl)
;; Draw a gear wheel. You'll probably want to call this function when
;; building a display list since we do a lot of trig here.
;;
;; Input: inner_radius - radius of hole at center
;; outer_radius - radius at center of teeth
;; width - width of gear
;; teeth - number of teeth
;; tooth_depth - depth of tooth
(define (gear inner-radius outer-radius width teeth tooth-depth)
(let ((r0 inner-radius)
(r1 (- outer-radius (/ tooth-depth 2.0)))
(r2 (+ outer-radius (/ tooth-depth 2.0)))
(da (* 2.0 (/ pi teeth 4.0))))
(gl-shade-model GL_FLAT)
(gl-normal 0.0 0.0 1.0)
;; draw front face
(gl-begin GL_QUAD_STRIP)
(dotimes (i (+ teeth 1))
(let1 angle (* i 2.0 (/ pi teeth))
(gl-vertex (* r0 (cos angle)) (* r0 (sin angle)) (* width 0.5))
(gl-vertex (* r1 (cos angle)) (* r1 (sin angle)) (* width 0.5))
(when (< i teeth)
(gl-vertex (* r0 (cos angle)) (* r0 (sin angle)) (* width 0.5))
(gl-vertex (* r1 (cos (+ angle (* 3 da))))
(* r1 (sin (+ angle (* 3 da))))
(* width 0.5)))))
(gl-end)
;; draw front sides of teeth
(gl-begin GL_QUADS)
(dotimes (i teeth)
(let1 angle (* i 2.0 (/ pi teeth))
(gl-vertex (* r1 (cos angle)) (* r1 (sin angle)) (* width 0.5))
(gl-vertex (* r2 (cos (+ angle da)))
(* r2 (sin (+ angle da)))
(* width 0.5))
(gl-vertex (* r2 (cos (+ angle (* 2 da))))
(* r2 (sin (+ angle (* 2 da))))
(* width 0.5))
(gl-vertex (* r1 (cos (+ angle (* 3 da))))
(* r1 (sin (+ angle (* 3 da))))
(* width 0.5))))
(gl-end)
(gl-normal 0.0 0.0 -1.0)
;; draw back face
(gl-begin GL_QUAD_STRIP)
(dotimes (i (+ teeth 1))
(let1 angle (* i 2.0 (/ pi teeth))
(gl-vertex (* r1 (cos angle)) (* r1 (sin angle)) (* width -0.5))
(gl-vertex (* r0 (cos angle)) (* r0 (sin angle)) (* width -0.5))
(when (< i teeth)
(gl-vertex (* r1 (cos (+ angle (* 3 da))))
(* r1 (sin (+ angle (* 3 da))))
(* width -0.5))
(gl-vertex (* r0 (cos angle)) (* r0 (sin angle)) (* width -0.5)))))
(gl-end)
;; draw back sides of teeth
(gl-begin GL_QUADS)
(dotimes (i teeth)
(let1 angle (* i 2.0 (/ pi teeth))
(gl-vertex (* r1 (cos (+ angle (* 3 da))))
(* r1 (sin (+ angle (* 3 da))))
(* width -0.5))
(gl-vertex (* r2 (cos (+ angle (* 2 da))))
(* r2 (sin (+ angle (* 2 da))))
(* width -0.5))
(gl-vertex (* r2 (cos (+ angle da)))
(* r2 (sin (+ angle da)))
(* width -0.5))
(gl-vertex (* r1 (cos angle)) (* r1 (sin angle)) (* width -0.5))))
(gl-end)
;; draw outward faces of teeth
(gl-begin GL_QUAD_STRIP)
(dotimes (i teeth)
(let* ((angle (* i 2.0 (/ pi teeth)))
(u (- (* r2 (cos (+ angle da))) (* r1 (cos angle))))
(v (- (* r2 (sin (+ angle da))) (* r1 (sin angle))))
(len (sqrt (+ (* u u) (* v v))))
(uu (/ u len))
(vv (/ v len)))
(gl-vertex (* r1 (cos angle)) (* r1 (sin angle)) (* width 0.5))
(gl-vertex (* r1 (cos angle)) (* r1 (sin angle)) (* width -0.5))
(gl-normal v (- u) 0.0)
(gl-vertex (* r2 (cos (+ angle da)))
(* r2 (sin (+ angle da)))
(* width 0.5))
(gl-vertex (* r2 (cos (+ angle da)))
(* r2 (sin (+ angle da)))
(* width -0.5))
(gl-normal (cos angle) (sin angle) 0.0)
(gl-vertex (* r2 (cos (+ angle da da)))
(* r2 (sin (+ angle da da)))
(* width 0.5))
(gl-vertex (* r2 (cos (+ angle da da)))
(* r2 (sin (+ angle da da)))
(* width -0.5))
(gl-normal (- (* r1 (sin (+ angle da da da)))
(* r2 (sin (+ angle da da))))
(- (- (* r1 (cos (+ angle da da da)))
(* r2 (cos (+ angle da da)))))
0.0)
(gl-vertex (* r1 (cos (+ angle da da da)))
(* r1 (sin (+ angle da da da)))
(* width 0.5))
(gl-vertex (* r1 (cos (+ angle da da da)))
(* r1 (sin (+ angle da da da)))
(* width -0.5))
(gl-normal (cos angle) (sin angle) 0.0)))
(gl-vertex (* r1 (cos 0)) (* r1 (sin 0)) (* width 0.5))
(gl-vertex (* r1 (cos 0)) (* r1 (sin 0)) (* width -0.5))
(gl-end)
(gl-shade-model GL_SMOOTH)
;; draw inside radius cylinder
(gl-begin GL_QUAD_STRIP)
(dotimes (i (+ teeth 1))
(let1 angle (* i 2.0 (/ pi teeth))
(gl-normal (- (cos angle)) (- (sin angle)) 0.0)
(gl-vertex (* r0 (cos angle)) (* r0 (sin angle)) (* width -0.5))
(gl-vertex (* r0 (cos angle)) (* r0 (sin angle)) (* width 0.5))))
(gl-end)
))
(define *view-rotx* 20.0)
(define *view-roty* 30.0)
(define *view-rotz* 0.0)
(define *gear1* 0)
(define *gear2* 0)
(define *gear3* 0)
(define *angle* 0.0)
(define *timer* #f)
(define *frames* 0)
(define (draw widget . _)
(let ((glcontext (gtk-widget-get-gl-context widget))
(gldrawable (gtk-widget-get-gl-drawable widget)))
;;*** OpenGL BEGIN ***
(when (gdk-gl-drawable-gl-begin gldrawable glcontext)
(gl-clear (logior GL_COLOR_BUFFER_BIT GL_DEPTH_BUFFER_BIT))
(begin
(gl-push-matrix)
(gl-rotate *view-rotx* 1.0 0.0 0.0)
(gl-rotate *view-roty* 0.0 1.0 0.0)
(gl-rotate *view-rotz* 0.0 0.0 1.0)
(begin
(gl-push-matrix)
(gl-translate -3.0 -2.0 0.0)
(gl-rotate *angle* 0.0 0.0 1.0)
(gl-call-list *gear1*)
(gl-pop-matrix))
(begin
(gl-push-matrix)
(gl-translate 3.1 -2.0 0.0)
(gl-rotate (- (* -2.0 *angle*) 9.0) 0.0 0.0 1.0)
(gl-call-list *gear2*)
(gl-pop-matrix))
(begin
(gl-push-matrix)
(gl-translate -3.1 4.2 0.0)
(gl-rotate (- (* -2.0 *angle*) 25.0) 0.0 0.0 1.0)
(gl-call-list *gear3*)
(gl-pop-matrix))
(gl-pop-matrix))
(if (gdk-gl-drawable-is-double-buffered gldrawable)
(gdk-gl-drawable-swap-buffers gldrawable)
(gl-flush))
(gdk-gl-drawable-gl-end gldrawable))
(inc! *frames*)
(let1 seconds (g-timer-elapsed *timer*)
(when (>= seconds 5.0)
(print #`",*frames* in ,seconds seconds = ,(/ *frames* seconds) FPS")
(g-timer-reset *timer*)
(set! *frames* 0)))
#t))
;; new window size or exposure
(define (reshape widget . _)
(let* ((glcontext (gtk-widget-get-gl-context widget))
(gldrawable (gtk-widget-get-gl-drawable widget))
(wsize (ref widget 'allocation))
(h (/ (ref wsize 'height) (ref wsize 'width))))
;;*** OpenGL BEGIN ***
(when (gdk-gl-drawable-gl-begin gldrawable glcontext)
(gl-viewport 0 0 (ref wsize 'width) (ref wsize 'height))
(gl-matrix-mode GL_PROJECTION)
(gl-load-identity)
(gl-frustum -1.0 1.0 (- h) h 5.0 60.0)
(gl-matrix-mode GL_MODELVIEW)
(gl-load-identity)
(gl-translate 0.0 0.0 -40.0)
(gdk-gl-drawable-gl-end gldrawable))
;;*** OpenGL END ***
#t))
(define (init widget)
(let ((glcontext (gtk-widget-get-gl-context widget))
(gldrawable (gtk-widget-get-gl-drawable widget)))
;;*** OpenGL BEGIN ***
(when (gdk-gl-drawable-gl-begin gldrawable glcontext)
(gl-light GL_LIGHT0 GL_POSITION '#f32(5.0 5.0 10.0 0.0))
(gl-enable GL_CULL_FACE)
(gl-enable GL_LIGHTING)
(gl-enable GL_LIGHT0)
(gl-enable GL_DEPTH_TEST)
;; make the gears
(set! *gear1* (gl-gen-lists 1))
(gl-new-list *gear1* GL_COMPILE)
(gl-material GL_FRONT GL_AMBIENT_AND_DIFFUSE '#f32(0.8 0.1 0.0 1.0))
(gear 1.0 4.0 1.0 20 0.7)
(gl-end-list)
(set! *gear2* (gl-gen-lists 1))
(gl-new-list *gear2* GL_COMPILE)
(gl-material GL_FRONT GL_AMBIENT_AND_DIFFUSE '#f32(0.0 0.8 0.2 1.0))
(gear 0.5 2.0 2.0 10 0.7)
(gl-end-list)
(set! *gear3* (gl-gen-lists 1))
(gl-new-list *gear3* GL_COMPILE)
(gl-material GL_FRONT GL_AMBIENT_AND_DIFFUSE '#f32(0.2 0.2 1.0 1.0))
(gear 1.3 2.0 0.5 10 0.7)
(gl-end-list)
(gl-enable GL_NORMALIZE)
(print)
(print #`"GL_RENDERER = ,(gl-get-string GL_RENDERER)")
(print #`"GL_VERSION = ,(gl-get-string GL_VERSION)")
(print #`"GL_VENDOR = ,(gl-get-string GL_VENDOR)")
(print #`"GL_EXTENSIONS = ,(gl-get-string GL_EXTENSIONS)")
(print)
(gdk-gl-drawable-gl-end gldrawable))
;;*** OpenGL END ***
;; create timer
(unless *timer* (set! *timer* (g-timer-new)))
(g-timer-start *timer*)
))
(define (idle widget)
(inc! *angle* 0.5)
(if (> *angle* 360) (set! *angle* (fmod *angle* 360)))
(gtk-widget-queue-draw widget)
#t)
(define *idle-id* 0)
(define (map widget . _)
(when (zero? *idle-id*)
(set! *idle-id* (gtk-idle-add-priority GDK_PRIORITY_REDRAW
(lambda _ (idle widget)))))
#t)
(define (unmap widget . _)
(unless (zero? *idle-id*)
(gtk-idle-remove *idle-id*)
(set! *idle-id* 0))
#t)
(define (visible widget event)
(if (= (ref event 'state) GDK_VISIBILITY_FULLY_OBSCURED)
(unless (zero? *idle-id*)
(gtk-idle-remove *idle-id*)
(set! *idle-id* 0))
(when (zero? *idle-id*)
(set! *idle-id* (gtk-idle-add-priority GDK_PRIORITY_REDRAW
(lambda _ (idle widget))))))
#t)
;; change view angle, exit upon ESC
(define (key widget event)
(let ((kv (ref event 'keyval))
(q (lambda () (gtk-widget-queue-draw widget))))
(cond
((= kv GDK_KEY_z) (set! *view-rotz* (fmod (+ *view-rotz* 5.0) 360)) (q))
((= kv GDK_KEY_Z) (set! *view-rotz* (fmod (- *view-rotz* 5.0) 360)) (q))
((= kv GDK_KEY_Up) (set! *view-rotx* (fmod (+ *view-rotx* 5.0) 360)) (q))
((= kv GDK_KEY_Down) (set! *view-rotx* (fmod (- *view-rotx* 5.0) 360)) (q))
((= kv GDK_KEY_Left) (set! *view-roty* (fmod (+ *view-roty* 5.0) 360)) (q))
((= kv GDK_KEY_Right) (set! *view-roty* (fmod (- *view-roty* 5.0) 360)) (q))
((= kv GDK_KEY_Escape) (gtk-main-quit))))
#t)
(define (main args)
(gtk-init args)
(unless (gdk-gl-query-extension)
(error "*** OpenGL is not supported."))
;;
;; Configure OpenGL-capable visual.
;;
(let1 glconfig (or (gdk-gl-config-new-by-mode (logior GDK_GL_MODE_RGB
GDK_GL_MODE_DEPTH
GDK_GL_MODE_DOUBLE))
(begin
(warn "*** Cannot find the double-buffered visual.\n*** Trying single-buffered visual.\n")
(gdk-gl-config-new-by-mode (logior GDK_GL_MODE_RGB
GDK_GL_MODE_DEPTH)))
(error "*** No appropriate OpenGL-capable visual found.")
)
;;
;; Top-level window.
;;
(let1 window (gtk-window-new GTK_WINDOW_TOPLEVEL)
(gtk-window-set-title window "gears")
(g-signal-connect window "delete_event" (lambda _ (gtk-main-quit)))
(g-signal-connect window "key_press_event" key)
(g-signal-connect window "unmap_event" unmap)
(let1 vbox (gtk-vbox-new #f 0)
(gtk-container-add window vbox)
(gtk-widget-show vbox)
;;
;; Drawing area for drawing OpenGL scene.
;;
(let1 drawing-area (gtk-drawing-area-new)
(gtk-widget-set-size-request drawing-area 300 300)
;; Set OpenGL-capability to the widget.
(gtk-widget-set-gl-capability drawing-area glconfig #f #t
GDK_GL_RGBA_TYPE)
(gtk-box-pack-start vbox drawing-area #t #t 0)
(gtk-widget-set-events drawing-area
(logior GDK_EXPOSURE_MASK
GDK_BUTTON_PRESS_MASK
GDK_VISIBILITY_NOTIFY_MASK))
(g-signal-connect drawing-area "realize" init)
(g-signal-connect drawing-area "configure_event" reshape)
(g-signal-connect drawing-area "expose_event" draw)
(g-signal-connect drawing-area "map_event" map)
(g-signal-connect drawing-area "unmap_event" unmap)
(g-signal-connect drawing-area "visibility_notify_event" visible)
(gtk-widget-show drawing-area))
;;
;; Simple quit button.
;;
(let1 button (gtk-button-new-with-label "Quit")
(gtk-box-pack-start vbox button #f #f 0)
(g-signal-connect button "clicked" (lambda _ (gtk-main-quit)))
(gtk-widget-show button))
);vbox
(gtk-widget-show window)
)
(gtk-main)
0))
|
