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;;; Catbird Game Engine
;;; Copyright © 2022 David Thompson <davet@gnu.org>
;;;
;;; Catbird 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.
;;;
;;; Catbird 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 Catbird. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Game scenes encapsulate a tree of nodes and the state machine
;; (modes) that manipulate those nodes to create a playable game.
;;
;;; Code:
(define-module (catbird scene)
#:use-module (catbird config)
#:use-module (catbird mixins)
#:use-module (catbird mode)
#:use-module (catbird node)
#:use-module (chickadee data array-list)
#:use-module (chickadee scripting)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 format)
#:use-module (oop goops)
#:use-module (srfi srfi-1)
#:export (<scene>
current-scene
with-scene
add-to-scene
scene-script
$
regions
major-mode
minor-modes
replace-major-mode
push-major-mode
pop-major-mode
add-minor-mode
remove-minor-mode))
(define-root-class <scene> (<node>)
(regions #:accessor regions #:init-value '())
(major-mode #:accessor major-mode #:init-keyword #:major-mode
#:init-form (make <nothing-mode>))
(major-mode-stack #:getter major-mode-stack #:init-thunk make-array-list)
(minor-modes #:accessor minor-modes #:init-value '())
(input-map #:getter input-map #:init-value '()))
(define current-scene (make-parameter #f))
(define-syntax-rule (with-scene scene body ...)
(parameterize ((current-scene scene)) body ...))
(define-syntax $
(syntax-rules ()
((_) (current-scene))
((_ names ...)
(& (current-scene) names ...))))
(define-method (add-to-scene . nodes)
(apply attach-to (current-scene) nodes))
(define-syntax-rule (scene-script body ...)
(run-script (current-scene) body ...))
(define-method (initialize (scene <scene>) args)
(next-method)
(with-scene scene
(attach (major-mode scene) scene)))
(define-method (replace-major-mode (scene <scene>) (mode <major-mode>))
(let ((old-mode (major-mode scene)))
(when old-mode
(detach old-mode))
(set! (major-mode scene) mode)
(attach mode scene)))
(define-method (replace-major-mode (mode <major-mode>))
(replace-major-mode (current-scene) mode))
(define-method (push-major-mode (scene <scene>) (mode <major-mode>))
(let ((old-mode (major-mode scene)))
(array-list-push! (major-mode-stack scene) old-mode)
(when old-mode
(pause old-mode))
(set! (major-mode scene) mode)
(attach mode scene)))
(define-method (push-major-mode (mode <major-mode>))
(push-major-mode (current-scene) mode))
(define-method (pop-major-mode (scene <scene>))
(let ((stack (major-mode-stack scene)))
(unless (array-list-empty? stack)
(let ((mode (major-mode scene))
(prev-mode (array-list-pop! stack)))
(when mode
(detach mode))
(set! (major-mode scene) prev-mode)
(resume prev-mode)))))
(define-method (pop-major-mode)
(pop-major-mode (current-scene)))
(define-method (add-minor-mode (scene <scene>) (mode <minor-mode>))
(when (parent mode)
(raise-exception
(make-exception-with-message "mode already attached to a scene")))
(set! (minor-modes scene) (cons mode (minor-modes scene)))
(attach mode scene))
(define-method (add-minor-mode (mode <minor-mode>))
(add-minor-mode (current-scene) mode))
(define-method (remove-minor-mode (scene <scene>) (mode <minor-mode>))
(unless (eq? scene (parent mode))
(raise-exception
(make-exception-with-message "mode not attached to scene")))
(let ((modes (minor-modes scene)))
(set! (minor-modes scene) (delq mode modes))
(detach mode)))
(define-method (remove-minor-mode (mode <minor-mode>))
(remove-minor-mode (current-scene) mode))
(define-method (remove-minor-mode (scene <scene>) (mode-class <class>))
(with-scene scene
(let ((mode (find (lambda (mode)
(eq? (class-of mode) mode-class))
(minor-modes scene))))
(when mode
(remove-minor-mode scene mode)))))
(define-method (search-modes (scene <scene>) proc)
(with-scene scene
(or (proc (major-mode scene))
(find (lambda (mode)
(proc mode))
(minor-modes scene)))))
(define-method (on-key-press (scene <scene>) key modifiers)
(search-modes scene
(lambda (mode)
(on-key-press mode key modifiers))))
(define-method (on-key-release (scene <scene>) key modifiers)
(search-modes scene
(lambda (mode)
(on-key-release mode key modifiers))))
(define-method (on-text-input (scene <scene>) text)
(search-modes scene
(lambda (mode)
(on-text-input mode text))))
(define-method (on-mouse-press (scene <scene>) button x y)
(search-modes scene
(lambda (mode)
(on-mouse-press mode button x y))))
(define-method (on-mouse-release (scene <scene>) button x y)
(search-modes scene
(lambda (mode)
(on-mouse-release mode button x y))))
(define-method (on-mouse-move (scene <scene>) x y x-rel y-rel buttons)
(search-modes scene
(lambda (mode)
(on-mouse-move mode x y x-rel y-rel buttons))))
(define-method (on-mouse-wheel (scene <scene>) x y)
(search-modes scene
(lambda (mode)
(on-mouse-wheel mode x y))))
(define-method (on-controller-press (scene <scene>) controller-id button)
(search-modes scene
(lambda (mode)
(on-controller-press mode controller-id button))))
(define-method (on-controller-release (scene <scene>) controller-id button)
(search-modes scene
(lambda (mode)
(on-controller-release mode controller-id button))))
(define-method (on-controller-move (scene <scene>) controller-id axis value)
(search-modes scene
(lambda (mode)
(on-controller-move mode controller-id axis value))))
(define-method (update (scene <scene>) dt)
(with-scene scene
(update (major-mode scene) dt)
(for-each (lambda (mode) (update mode dt))
(minor-modes scene))))
(define-method (pause (scene <scene>))
(for-each-child pause scene)
(next-method))
(define-method (resume (scene <scene>))
(for-each-child resume scene)
(next-method))
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