315 lines
11 KiB
Common Lisp
315 lines
11 KiB
Common Lisp
;;;; flight-sim.lisp
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(in-package #:flight-sim)
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;;; "flight-sim" goes here. Hacks and glory await!
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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 :inotform (make-instance 'body))))
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(defclass engine-object (game-object)
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((active :initarg :active :reader active :initform nil)
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(start-time :initarg :start-time :reader start-time :initform nil)
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(forces :initarg :forces :accessor forces :initform '())))
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(defgeneric activate-engine (object engine-sym))
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(defmethod activate-engine ((object powered-object) engine-sym)
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(push :engine-sym (getf (engines object) :active))
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(engine-start (getf (getf (engines object) :engines) engine-sym) (wall-time)))
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(defgeneric engine-start (engine time))
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(defmethod engine-start ((engine engine-object) time)
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(setf (slot-value engine 'active) t)
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(setf (slot-value engine 'start-time) time))
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(defgeneric engine-stop (engine))
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(defmethod engine-stop ((engine engine-object))
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(setf (slot-value engine 'active) nil))
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; take 2 seconds to fully fire
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(defmethod engine-genmodel ((engine engine-object))
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(let ((time (- (wall-time) (start-time engine))))
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(setf (model engine)
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(make-model-3pyramid (make-2d-array 4 3
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`((0.0 0.5 0.0) (-2.0 -0.5 0.0) (2.0 -0.5 0.0)
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; z goes from 0 to 1 in 2 seconds
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(0.0 0.0 ,(converge 0 1 2 time))))
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:point-colors (make-2d-array 4 3 `(
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(,(converge 16 64 2 time) ,(converge 0 132 2 time) ,(converge 32 164 2 time))
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(,(converge 16 64 2 time) ,(converge 0 132 2 time) ,(converge 32 164 2 time))
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(,(converge 16 64 2 time) ,(converge 0 132 2 time) ,(converge 32 164 2 time))
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(,(converge 0 255 2 time) ,(converge 0 255 2 time) ,(converge 64 255 2 time))))))))
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(defclass powered-object (game-object)
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;; plist :: ( :objects (plist models) :active (list symbols))
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((engines :initarg :engines :accessor engines :initform '(:engines () :active ()))))
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; ((engine :initarg :engine :accessor engine :initform nil)))
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;(attachments :initarg :attachments :accessor attachments :initform nil)))
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;; time is time elapsed in seconds (with decimal for sub seconds)
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(defmethod time-step ((engine engine) object time)
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; f = ma
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(let ((accel (/ (force engine) (mass object))))
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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 motion) i)
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(+ (* (aref (velocity motion) i) time) (* .5 (aref (acceleration motion) i) (expt time 2))))
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(incf (aref (velocity motion) i)
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(* time (aref (acceleration motion) i))))))
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(defmethod time-step ((object powered-object) time)
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(loop for engine in (loop for engine-sym in (getf (engines object) :active) collecting (getf (engines engines) engine-sym)) do
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(time-step engine object time)))
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; (motion-step (motion *self*) time))
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;(defclass engine ()
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; (
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; (make-instance 'model
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; :vertices (make-2d-array 4 3 '((0 0 0) (0 1 3) (-2 0 3) (2 0 3)))
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; :faces (make-2d-array 4 3 '((0 1 3) (0 2 1) (0 3 2) (1 2 3)))
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; :colors (make-2d-array 2 3 '((196 196 196) (32 32 32)))
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; :face-colors (make-2d-array 4 3 '((0 0 0) (0 0 0) (0 0 0) (1 1 1)))))
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(defparameter *world* nil)
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(defparameter *self* nil)
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(defparameter *velocity* 2) ; 1 unit / second
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(defparameter *acceleration* 2) ; 1 unit /second
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(defparameter *controls-active* '())
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(defparameter *start-time* (wall-time))
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(defparameter *last-time* nil)
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(defparameter *num-frames* 0)
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(defun draw-triangle (tri colors)
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(declare (type shape-vector tri))
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(declare (type shape-vector colors))
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(gl:with-primitive :triangles
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(let ((c (aref colors 0)))
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(gl:color (aref c 0) (aref c 1) (aref c 2)))
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(let ((v (aref tri 0)))
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(gl:vertex (aref v 0) (aref v 1) (aref v 2)))
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(let ((c (aref colors 1)))
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(gl:color (aref c 0) (aref c 1) (aref c 2)))
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(let ((v (aref tri 1)))
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(gl:vertex (aref v 0) (aref v 1) (aref v 2)))
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(let ((c (aref colors 2)))
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(gl:color (aref c 0) (aref c 1) (aref c 2)))
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(let ((v (aref tri 2)))
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(gl:vertex (aref v 0) (aref v 1) (aref v 2)))))
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(defun draw-entity (entity)
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(gl:translate (aref (coords (motion entity)) 0) (aref (coords (motion entity)) 1) (aref (coords (motion entity)) 2))
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(gl:rotate (aref (angles entity) 0) 1 0 0)
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(gl:rotate (aref (angles entity) 1) 0 1 0)
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(gl:rotate (aref (angles entity) 2) 0 0 1)
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(loop for i from 0 to (1- (length (faces (model entity)))) do
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(draw-triangle (get-vertecies (aref (faces (model entity)) i) (vertices (model entity)))
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(get-vertecies (aref (face-colors (model entity)) i) (colors (model entity))))))
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(defgeneric object-draw (object))
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(defmethod object-draw :before ((object game-object))
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(gl:push-matrix))
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(defmethod object-draw :after ((object game-object))
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(gl:pop-matrix))
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(defmethod object-draw ((object game-object))
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(draw-entity object))
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(defmethod object-draw ((object powered-object))
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(draw-entity object)
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(if (eql (active (engine object)) t)
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(progn
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(setf (model (engine object)) (engine-genmodel (engine object)))
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(gl:translate 0 0 0)
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(object-draw (engine object)))))
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(defun draw ()
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;; clear the buffer
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(gl:clear :color-buffer-bit :depth-buffer-bit)
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;; move to eye position
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(object-draw (make-instance 'powered-object :motion (make-instance 'motion :coords (vector 0 0 -3)) :model *ship-model* :engine (engine *self*)))
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(gl:translate (- (aref (coords (motion *self*)) 0)) (- (aref (coords (motion *self*)) 1)) (- (aref (coords (motion *self*)) 2))) ;; eye
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(loop for entity across *world* do
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; only draw if its infront of me
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(if (< (aref (coords (motion entity)) 2) (+ 10 (aref (coords (motion *self*)) 2)))
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(object-draw entity)))
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(gl:matrix-mode :modelview)
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(gl:load-identity)
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(glu:look-at 0 6 10 ;; pos
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0 0 0 ;; center
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0 1 0 ;; up in y pos
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)
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;; finish the frame
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(gl:flush)
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(sdl:update-display))
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(defun phys-step (time)
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(time-step *self* time))
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(defun thruster-on (key)
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(case key
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((:sdl-key-w) ; + z
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(progn
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;(setf (aref (acceleration (motion *self*)) 2) (- *acceleration*))
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;(engine-start (engine *self*) (wall-time))))
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(activate-engine *self* :thrust)))
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((:sdl-key-s) ; - z
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(setf (aref (acceleration (motion *self*)) 2) *acceleration*))
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((:sdl-key-q) ; + x
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(setf (aref (acceleration (motion *self*)) 0) *acceleration*))
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((:sdl-key-a) ; - x
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(setf (aref (acceleration (motion *self*)) 0) (- *acceleration*)))
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((:sdl-key-e) ; + y
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(setf (aref (acceleration (motion *self*)) 1) *acceleration*))
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((:sdl-key-d) ; - y
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(setf (aref (acceleration (motion *self*)) 1) (- *acceleration*)))
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(otherwise (format t "~a~%" key))))
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(defun thruster-off (key)
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(case key
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((:sdl-key-w) ; + z
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(progn
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(setf (aref (acceleration (motion *self*)) 2) 0)
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(engine-stop (engine *self*))))
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((:sdl-key-s) ; - z
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(setf (aref (acceleration (motion *self*)) 2) 0))
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((:sdl-key-q) ; + q
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(setf (aref (acceleration (motion *self*)) 0) 0))
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((:sdl-key-a) ; - a
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(setf (aref (acceleration (motion *self*)) 0) 0))
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((:sdl-key-e) ; + e
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(setf (aref (acceleration (motion *self*)) 1) 0))
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((:sdl-key-d) ; - d
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(setf (aref (acceleration (motion *self*)) 1) 0))
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(otherwise (format t "~a~%" key))))
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(defun sim-step ()
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"draw a frame"
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(let* ((start-time (wall-time))
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(time (- start-time *last-time*)))
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(phys-step time)
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(draw)
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(incf *num-frames*)
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(if (not (eql (floor *last-time*) (floor time)))
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(let* ((short-interval time)
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(long-interval (- start-time *start-time*) )
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(short-fps (floor (if (zerop short-interval) 0 (/ 1 short-interval))))
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(long-fps (floor (if (zerop long-interval) 0 (/ *num-frames* long-interval)))))
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(format t "FPS since last:~a since start:~a (~a frames in ~a seconds)~%" short-fps long-fps *num-frames* long-interval)))
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(setf *last-time* start-time)))
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(defun reshape ()
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(gl:shade-model :smooth)
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(gl:clear-color 0 0 0 0)
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(gl:clear-depth 1)
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(gl:enable :depth-test)
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(gl:depth-func :lequal)
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(gl:enable :cull-face)
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(gl:hint :perspective-correction-hint :nicest)
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(gl:matrix-mode :projection)
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(gl:load-identity)
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(glu:perspective 50; 45 ;; FOV
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1.0 ;; aspect ratio(/ width (max height 1))
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1/10 ;; z near
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1000 ;; z far
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)
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(gl:matrix-mode :modelview)
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)
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(defun populate-world ()
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(setf *world*
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(make-array 101 :initial-contents
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(loop for i from 0 to 100 collecting
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(let ((e (make-instance 'game-object
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:model (make-instance 'model
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:vertices (vertices *diamond-model*)
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:faces (faces *diamond-model*))
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:angles (vector (random 360) (random 360) (random 360))
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:motion (make-instance 'motion
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:coords (vector (- (random 75) 37) (- (random 75) 37) (- (random 200) ))))))
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(setf (colors (model e)) (make-2d-array 3 3 `((,(random 255) ,(random 255) ,(random 255)) (,(random 255) ,(random 255) ,(random 255)) (,(random 255) ,(random 255) ,(random 255)))))
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(setf (face-colors (model e)) (make-2d-array 8 3 '((0 1 1) (0 1 1) (0 1 1) (0 1 1) (1 2 1) (1 2 1) (1 2 1) (1 2 1))))
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e)))))
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(defun init ()
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(setf *start-time* (wall-time))
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(setf *num-frames* 0)
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(setf *last-time* *start-time*)
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(setf *controls-active* '())
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(setf *self* (make-instance 'powered-object
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:motion (make-instance 'motion :coords (vector 0 0 11))
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:model *ship-model*
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:engines (list :engines (list :thrust
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(make-instance 'engine-object
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:motion (make-instance 'motion :coords (vector 0 0.5 3.0))
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:forces (list (make-instance 'force :newtons 10 :direction '(0 0 1))))))))
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(populate-world)
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)
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(defun main-loop ()
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(init)
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(sdl:with-init ()
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(sdl:window 640 480 :flags sdl:sdl-opengl)
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;; cl-opengl needs platform specific support to be able to load GL
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;; extensions, so we need to tell it how to do so in lispbuilder-sdl
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(reshape)
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(setf cl-opengl-bindings:*gl-get-proc-address* #'sdl-cffi::sdl-gl-get-proc-address)
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(sdl:with-events ()
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(:quit-event () t)
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(:key-down-event (:key key) (thruster-on key)) ;(push key *controls-active*))
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(:key-up-event (:key key) (thruster-off key)) ;(setf *controls-active* (remove key *controls-active*)))
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(:idle ()
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;; this lets slime keep working while the main loop is running
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;; in sbcl using the :fd-handler swank:*communication-style*
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;; (something similar might help in some other lisps, not sure which though)
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#+(and sbcl (not sb-thread)) (restartable
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(sb-sys:serve-all-events 0))
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(restartable (sim-step))))))
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;(draw))))) |