57 lines
2.1 KiB
Common Lisp
57 lines
2.1 KiB
Common Lisp
(in-package #:flight-sim)
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(defclass game-object ()
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((model :initarg :model :accessor model :initform (make-instance 'model))
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(body :initarg :body :accessor body :initform (make-instance 'body))
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(attachments :initarg :attachments :accessor attachments :initform '())
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(active-attachments :initarg :active-attachments :accessor active-attachments :initform '())))
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;(defmethod coords ((object game-object))
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; (coords (body object)))
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(defgeneric activate (object start-time))
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(defgeneric activate-attachment (object sym start-time))
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(defgeneric deactivate (object))
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(defgeneric deactivate-attachment (object sym))
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(defmethod activate-attachment ((object game-object) sym start-time)
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(push sym (active-attachments object))
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(activate (getf (attachments object) sym) start-time))
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(defmethod deactivate-attachment ((object game-object) sym)
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(setf (active-attachments object) (remove sym (active-attachments object))))
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(defmethod draw :before ((object game-object) time)
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(gl:push-matrix)
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(gl:translate (aref (coords (body object)) 0) (aref (coords (body object)) 1) (aref (coords (body object)) 2))
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(gl:rotate (aref (angles (body object)) 0) 1 0 0)
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(gl:rotate (aref (angles (body object)) 1) 0 1 0)
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(gl:rotate (aref (angles (body object)) 2) 0 0 1))
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(defmethod draw :after ((object game-object) time)
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(gl:pop-matrix))
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(defmethod draw ((object game-object) time)
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(draw (model object) time)
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(loop for a in (active-attachments object) do
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(draw (getf (attachments object) a) time)))
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;; get the vector of accel src object exerts on target object
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(defgeneric get-accel (src target))
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(defgeneric apply-accel (object accel time))
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; time is time elapsed in seconds (with decimal for sub seconds)
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(defmethod apply-accel ((object game-object) accel time)
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; x = x +v*t + 1/2 * a * t^2
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(dotimes (i 3) (progn
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(incf (aref (coords (body object)) i)
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(+ (* (aref (velocity (motion (body object))) i) time) (* .5 (aref accel i) (expt time 2))))
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(incf (aref (velocity (motion (body object))) i)
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(* time (aref accel i))))))
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