examples/triangle.lisp

   1 (require '#:asdf)
   2 (asdf:oos 'asdf:load-op '#:cl-glfw)
   3
   4
   5 (let ((frames 0)
   6       t0 t1)
   7   (glfw:do-window ("Spinning Triangle" 640 480)
   8       ((glfw:enable glfw:+sticky-keys+)
   9        (glfw:swap-interval 0)
  10        (setf t0 (glfw:get-time)
  11              t1 (glfw:get-time)))
  12
  13     (when (eql (glfw:get-key glfw:+key-esc+) glfw:+press+)
  14       (return-from glfw:do-window))
  15
  16     (setf t1 (glfw:get-time))
  17
  18     (when (or (> (- t1 t0) 1)
  19               (= frames 0))
  20       (glfw:set-window-title (format nil "Spinning Triangle (~,1f FPS)" (/ frames (- t1 t0))))
  21       (setf frames 0
  22             t0 t1))
  23
  24     (incf frames)
  25
  26     (destructuring-bind (width height) (glfw:get-window-size)
  27       (setf height (max height 1))
  28       (gl:viewport 0 0 width height)
  29
  30       (gl:clear-color 0 0 0 0)
  31       (gl:clear gl:+color-buffer-bit+)
  32
  33       (gl:matrix-mode gl:+projection+)
  34       (gl:load-identity)
  35       (glu:perspective 65 (/ width height) 1 100)
  36       (gl:matrix-mode gl:+modelview+)
  37       (gl:load-identity)
  38       (glu:look-at 0  1 0
  39                    0 20 0
  40                    0  0 1)
  41
  42       (gl:translate-f 0 14 0)
  43
  44
  45       (destructuring-bind (x y) (glfw:get-mouse-pos)
  46         (declare (ignore y))
  47         (gl:rotate-f (+ (* x 0.3)
  48                         (* t1 100))
  49                      0 0 1))
  50
  51       (gl:with-begin gl:+triangles+
  52         (gl:color-3f 1 0 0) (gl:vertex-3f -5 0 -4)
  53         (gl:color-3f 0 1 0) (gl:vertex-3f  5 0 -4)
  54         (gl:color-3f 0 0 1) (gl:vertex-3f  0 0  6)))))