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dded cycling rainbow and start of transform code

This commit is contained in:
Dan Ballard 2011-06-29 00:59:16 -07:00
parent 0afbe7502b
commit 4e25d91ce5
1 changed files with 51 additions and 11 deletions
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62
3bb-1.lisp
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@ -5,20 +5,60 @@
(progn ,@body)
(continue () :report "Continue")))
(let ((time-units (/ 1.0 internal-time-units-per-second)))
(defun wall-time (&key (offset 0))
(+ (* (get-internal-real-time) time-units)
offset)))
(defvar *start-time* (wall-time))
(defun shift-color (time)
(values
;;; red
(/ (+ (* (sin (+ (* 0.3 time) 0)) 127) 128) 255)
;;; green
(/ (+ (* (sin (+ (* 0.3 time) (* 2/3 PI))) 127 ) 128) 255)
;;; blue
(/ (+ (* (sin (+ (* 0.3 time) (* 4/3 PI))) 127) 128) 255)))
(defparameter *t1* '( (-0.5 -0.5 0) (0 0.5 0) (0.5 -0.5 0)))
(defun rotate-vertex (v time)
(list (+ (first v) (/ (sin time) 2)) (+ (second v) (/ (cos time) 2)) (third v)))
(defun rotate-triangle (tri time)
(list (rotate-vertex (first tri) time)
(rotate-vertex (second tri) time)
(rotate-vertex (third tri) time)))
(defun draw ()
"draw a frame"
(gl:clear :color-buffer-bit)
(let* ((time (- (wall-time) *start-time*))
(t1 (rotate-triangle *t1* time)))
;;;(setf *last-time* (wall-time))
; (format t "~a ~a: ~a ~a ~a~%" *start-time* time red green blue)
(gl:clear :color-buffer-bit)
;;; draw a triangle
(gl:with-primitive :triangles
(gl:color 1 0 0)
(gl:vertex 0 0 0)
(gl:color 0 1 0)
(gl:vertex 0.5 1 0)
(gl:color 0 0 1)
(gl:vertex 1 0 0))
;; finish the frame
(gl:flush)
(sdl:update-display))
(gl:with-primitive :triangles
(multiple-value-bind (red green blue) (shift-color time)
(gl:color red green blue))
(multiple-value-bind (v1 v2 v3) (values-list (first t1))
(gl:vertex v1 v2 v3))
(multiple-value-bind (green blue red) (shift-color time)
(gl:color red green blue))
(multiple-value-bind (v1 v2 v3) (values-list (second t1))
(gl:vertex v1 v2 v3))
(multiple-value-bind (blue green red) (shift-color time)
(gl:color red green blue))
(multiple-value-bind (v1 v2 v3) (values-list (third t1))
(gl:vertex v1 v2 v3)))
;; finish the frame
(gl:flush)
(sdl:update-display)))
(defun main-loop ()
(sdl:with-init ()