gtk-glext/gtkglext-drawing-area.lisp

   1 (in-package :gtkglext)
   2
   3 (register-object-type-implementation "GtkGLDrawingArea" gl-drawing-area "GtkDrawingArea" nil nil)
   4
   5 (defclass gl-drawing-area (drawing-area)
   6   ((on-expose :initarg :on-expose :initform nil :accessor gl-drawing-area-on-expose)
   7    (on-init :initarg :on-init :initform nil :accessor gl-drawing-area-on-init)
   8    (on-resize :initarg :on-resize :initform nil :accessor gl-drawing-area-on-resize)
   9    (realized-p :initform nil :accessor gl-drawing-area-realized-p))
  10   (:metaclass gobject-class)
  11   (:g-type-name . "GtkGLDrawingArea"))
  12
  13 (defun resize (widget width height)
  14   (with-gl-context (widget)
  15     (if (gl-drawing-area-on-resize widget)
  16         (funcall (gl-drawing-area-on-resize widget) widget width height)
  17         (progn
  18           (gl:viewport 0 0 width height)
  19
  20           ;; set projection to account for aspect
  21           (gl:matrix-mode :projection)
  22           (gl:load-identity)
  23           (glu:perspective 90 (/ width height) 0.5 20) ; 90 degrees field of view y, clip 0.5-20 z
  24
  25           ;; set modelview to identity
  26           (gl:matrix-mode :modelview)
  27           (gl:load-identity)))))
  28
  29 (defun gl-drawing-area-configure (widget event)
  30   (declare (ignore event))
  31   (multiple-value-bind (width height)
  32       (gdk:drawable-get-size (widget-window widget))
  33     #+nil(format t "configure ~Dx~D~%" width height)
  34     (when (gl-drawing-area-realized-p widget)
  35       (resize widget width height))))
  36
  37 (defun gl-drawing-area-realize (widget)
  38   #+nil(format t "realize~%")
  39   (bwhen (init-fn (gl-drawing-area-on-init widget))
  40     (with-gl-context (widget)
  41       (funcall init-fn widget)))
  42   (setf (gl-drawing-area-realized-p widget) t)
  43   (multiple-value-bind (width height)
  44       (gdk:drawable-get-size (widget-window widget))
  45     (resize widget width height))
  46   nil)
  47
  48 (defun gl-drawing-area-unrealize (widget)
  49   (setf (gl-drawing-area-realized-p widget) nil)
  50   nil)
  51
  52 (defun gl-drawing-area-exposed (widget event)
  53   (bwhen (draw-fn (gl-drawing-area-on-expose widget))
  54     (with-gl-context (widget)
  55       (funcall draw-fn widget event)))
  56   nil)
  57
  58 (defun gl-drawing-area-parent-set (widget event)
  59   (declare (ignore event))
  60   (unless (gtk-widget-set-gl-capability widget
  61                                         *gl-config*
  62                                         nil
  63                                         nil
  64                                         :rgba-type)
  65     (warn "set gl capability for ~A (with ~A) failed~%" widget *gl-config*)))
  66
  67 (defmethod initialize-instance :after ((widget gl-drawing-area) &key &allow-other-keys)
  68   (connect-signal widget "realize" #'gl-drawing-area-realize)
  69   (connect-signal widget "unrealize" #'gl-drawing-area-unrealize)
  70   (connect-signal widget "expose-event" #'gl-drawing-area-exposed)
  71   (connect-signal widget "configure-event" #'gl-drawing-area-configure)
  72   (connect-signal widget "parent-set" #'gl-drawing-area-parent-set))