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;;; Catbird Game Engine
;;; Copyright © 2022 David Thompson <davet@gnu.org>
;;;
;;; Licensed under the Apache License, Version 2.0 (the "License");
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; http://www.apache.org/licenses/LICENSE-2.0
;;;
;;; Unless required by applicable law or agreed to in writing, software
;;; distributed under the License is distributed on an "AS IS" BASIS,
;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
;;; See the License for the specific language governing permissions and
;;; limitations under the License.
;;; 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 (catbird pushdown)
#:use-module (chickadee data array-list)
#:use-module (chickadee scripting)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#: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
on-region-resize
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-state #:getter major-mode-state #:init-thunk make-pushdown-state)
(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-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
(replace-major-mode scene (make <nothing-mode>))))
(define-method (major-mode (scene <scene>))
(state-current (major-mode-state scene)))
(define-method (replace-major-mode (scene <scene>) (mode <major-mode>))
(let ((old-mode (major-mode scene)))
(when old-mode
(detach old-mode))
(state-replace! (major-mode-state 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)))
(when old-mode
(pause old-mode))
(state-push! (major-mode-state 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>))
(when (state-previous (major-mode-state scene))
(let ((mode (major-mode scene)))
(when mode
(detach mode))
(resume (state-pop! (major-mode-state scene))))))
(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 (on-region-resize (scene <scene>))
#t)
(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))
(define-method (width (scene <scene>))
(fold (lambda (r w) (max w (width r))) 0.0 (regions scene)))
(define-method (height (scene <scene>))
(fold (lambda (r h) (max h (height r))) 0.0 (regions scene)))
(define-method (pick (scene <scene>) p)
(let loop ((kids (children scene)))
(match kids
(() #f)
((node . rest)
(or (pick node p)
(loop rest))))))
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