gtk-glext/gtkglext-drawing-area.lisp

   1 (in-package :gtkglext)
   2
   3 (defclass gl-drawing-area (drawing-area)
   4   ((on-expose :initarg :on-expose :initform nil :accessor gl-drawing-area-on-expose)
   5    (on-init :initarg :on-init :initform nil :accessor gl-drawing-area-on-init)
   6    (on-resize :initarg :on-resize :initform nil :accessor gl-drawing-area-on-resize))
   7   (:metaclass gobject-class)
   8   (:g-type-name . "GtkGLDrawingArea"))
   9
  10 (defun resize (widget width height)
  11   (with-gl-context (widget)
  12     (if (gl-drawing-area-on-resize widget)
  13         (funcall (gl-drawing-area-on-resize widget) widget width height))
  14         (progn
  15           (gl:viewport 0 0 width height)
  16
  17           ;; set projection to account for aspect
  18           (gl:matrix-mode :projection)
  19           (gl:load-identity)
  20           (glu:perspective 90 (/ width height) 0.5 20) ; 90 degrees field of view y, clip 0.5-20 z
  21
  22           ;; set modelview to identity
  23           (gl:matrix-mode :modelview)
  24           (gl:load-identity))))
  25
  26 (defun gl-drawing-area-configure (widget event)
  27   (declare (ignore event))
  28   (multiple-value-bind (width height)
  29       (gdk:drawable-get-size (widget-window widget))
  30     #+nil(format t "configure ~Dx~D~%" width height)
  31     (when (widget-realized-p widget)
  32       (resize widget width height))))
  33
  34 (defun gl-drawing-area-realize (widget)
  35   #+nil(format t "realize~%")
  36   (bwhen (init-fn (gl-drawing-area-on-init widget))
  37     (funcall init-fn widget))
  38   (multiple-value-bind (width height)
  39       (gdk:drawable-get-size (widget-window widget))
  40     (resize widget width height))
  41   nil)
  42
  43 (defun gl-drawing-area-exposed (widget event)
  44   (bwhen (draw-fn (gl-drawing-area-on-expose widget))
  45     (with-gl-context (widget)
  46       (funcall draw-fn widget event)))
  47   nil)
  48
  49 (defun gl-drawing-area-parent-set (widget event)
  50   (declare (ignore event))
  51   (unless (gtk-widget-set-gl-capability widget
  52                                         *gl-config*
  53                                         nil
  54                                         nil
  55                                         :rgba-type)
  56     (warn "set gl capability for ~A (with ~A) failed~%" widget *gl-config*)))
  57
  58 (register-object-type-implementation "GtkGLDrawingArea" gl-drawing-area "GtkDrawingArea" nil nil)
  59
  60 (defmethod initialize-instance :after ((widget gl-drawing-area) &key &allow-other-keys)
  61   (connect-signal widget "realize" #'gl-drawing-area-realize)
  62   (connect-signal widget "expose-event" #'gl-drawing-area-exposed)
  63   (connect-signal widget "configure-event" #'gl-drawing-area-configure)
  64   (connect-signal widget "parent-set" #'gl-drawing-area-parent-set))