69 lines
3.1 KiB
Common Lisp
69 lines
3.1 KiB
Common Lisp
;;;; Copyright © 2023, Jaidyn Ann <jadedctrl@posteo.at>
|
||
;;;;
|
||
;;;; This program is free software: you can redistribute it and/or
|
||
;;;; modify it under the terms of the GNU General Public License as
|
||
;;;; published by the Free Software Foundation, either version 3 of
|
||
;;;; the License, or (at your option) any later version.
|
||
;;;;
|
||
;;;; This program is distributed in the hope that it will be useful,
|
||
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
;;;; GNU General Public License for more details.
|
||
;;;;
|
||
;;;; You should have received a copy of the GNU General Public License
|
||
;;;; along with this program. If not, see <https://www.gnu.org/licenses/>.
|
||
|
||
;;;; FLORA-SEARCH-AURORA.ENGINE
|
||
;;;; The core of the game’s engine, the loop. Not much to see here other
|
||
;;;; than a loop. Honest!
|
||
|
||
(in-package :flora-search-aurora.engine)
|
||
|
||
|
||
(defun state-loop
|
||
(states &key (last-matrix (✎:make-screen-matrix)) (matrix (✎:make-screen-matrix)) (state-params nil))
|
||
"Begin the game’s loop, which executes (henceforthly called) state-functions over and over again
|
||
until Hell freezes over and a new king reigns supreme.
|
||
Given a list of state-functions, STATES, it will execute the first function.
|
||
Each state-function must take at least a single parameter, a matrix of characters. A state-function
|
||
should edit this matrix in-place, replacing its elements with characters that will later be printed
|
||
to the terminal.
|
||
What the state-function returns is pretty important, having different repercussions:
|
||
* NIL — The function is removed from STATES, and so the next function in STATES will start
|
||
getting executed instead.
|
||
* T — The function will continue to be run with the same parameters.
|
||
* (:FUNCTION FUNCTION :PARAMETERS LIST :DROP NUMBER)
|
||
Make note to add a delay w SLEEP to your state functions, or… well, y’know. Your computer will
|
||
overheat, or something ¯\_(ツ)_/¯"
|
||
(when states
|
||
(let ((state-result
|
||
(apply (car states) (cons matrix state-params)))) ;; Run the last-added state-loop.
|
||
(✎:print-screen-matrix (✎:matrix-delta last-matrix matrix)) ;; Print its results.
|
||
;; (format *error-output* "~S~%" state-result)
|
||
(force-output)
|
||
(state-loop
|
||
(cond ((listp state-result)
|
||
(nconc (if (getf state-result :function)
|
||
(list (getf state-result :function)))
|
||
(nthcdr (or (getf state-result :drop) 0) states)))
|
||
((not state-result)
|
||
(cdr states))
|
||
('t states))
|
||
:state-params
|
||
(cond ((listp state-result)
|
||
(getf state-result :parameters))
|
||
((not state-result)
|
||
nil)
|
||
('t state-params))
|
||
:last-matrix matrix))))
|
||
|
||
|
||
(defun main (states)
|
||
"A toplevel-worthy function that configures rendering and kicks off the
|
||
game’s loop. Let’s get started!"
|
||
(cl-charms:with-curses ()
|
||
(cl-charms:enable-raw-input :interpret-control-characters 't)
|
||
(✎:hide-cursor)
|
||
(✎:clear-screen)
|
||
(state-loop states)))
|