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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:
;;
;; Rectangular sub-regions of the game window to which a scene can be
;; rendered.
;;
;;; Code:
(define-module (catbird region)
#:use-module (catbird camera)
#:use-module (catbird config)
#:use-module (catbird mixins)
#:use-module (catbird node)
#:use-module (catbird pushdown)
#:use-module (catbird scene)
#:use-module (chickadee)
#:use-module (chickadee data array-list)
#:use-module (chickadee graphics engine)
#:use-module (chickadee graphics framebuffer)
#:use-module (chickadee graphics sprite)
#:use-module (chickadee math matrix)
#:use-module (chickadee math rect)
#:use-module (ice-9 exceptions)
#:use-module (oop goops)
#:export (<region>
make-region
area
area-x
area-y
area-width
area-height
camera
freeze
frozen?
scene
replace-scene
push-scene
pop-scene
unfreeze)
#:re-export (name
rank
render
update))
(define-root-class <region> (<renderable> <updatable> <nameable> <rankable>)
(area #:accessor area #:init-keyword #:area)
(camera #:accessor camera #:init-keyword #:camera #:init-value #f)
(scene-state #:accessor scene-state #:init-thunk make-pushdown-state)
(framebuffer #:accessor framebuffer)
(framebuffer-rect #:accessor framebuffer-rect)
;; Regions can be frozen for debugging purposes, so that the scene
;; they contain isn't updated or rendered.
(frozen? #:accessor frozen? #:init-value #f))
(define-method (area-x (region <region>))
(rect-x (area region)))
(define-method (area-y (region <region>))
(rect-y (area region)))
(define-method (area-width (region <region>))
(rect-width (area region)))
(define-method (width (region <region>))
(area-width region))
(define-method (area-height (region <region>))
(rect-height (area region)))
(define-method (height (region <region>))
(area-height region))
(define (float->int x)
(inexact->exact (round x)))
(define-method (initialize (region <region>) args)
(next-method)
(let ((r (area region)))
(set! (framebuffer region)
(make-framebuffer (float->int (rect-width r))
(float->int (rect-height r))))
(set! (framebuffer-rect region)
(make-rect 0.0 0.0
(float->int (rect-width r))
(float->int (rect-height r))))))
(define (make-region area name rank)
(let* ((window (current-window))
(w (window-width window))
(h (window-height window)))
(when (or (< (rect-left area) 0.0)
(< (rect-bottom area) 0.0)
(> (rect-right area) w)
(> (rect-top area) h))
(raise-exception
(make-exception-with-message "region area exceeds window area")))
(make <region> #:area area #:name name #:rank rank)))
(define-method (freeze (region <region>))
(set! (frozen? region) #t))
(define-method (unfreeze (region <region>))
(set! (frozen? region) #f))
(define-method (scene (region <region>))
(state-current (scene-state region)))
(define-method (replace-scene (region <region>) (new-scene <scene>))
(let ((old-scene (scene region)))
(when old-scene (on-exit old-scene))
(state-push! (scene-state region) new-scene)
(set! (regions new-scene) (cons region (regions new-scene)))
(on-enter new-scene)))
(define-method (push-scene (region <region>) (new-scene <scene>))
(let ((old-scene (scene region)))
(when old-scene
(on-exit old-scene))
(state-push! (scene-state region))
(set! (regions new-scene) (cons region (regions new-scene)))
(on-enter new-scene)))
(define-method (pop-scene (region <region>))
(let ((old-scene (state-pop! (scene-state region))))
(on-exit old-scene)
(set! (regions old-scene)
(delq region (regions old-scene))))
(let ((restored-scene (scene region)))
(when restored-scene
(on-enter restored-scene))))
(define-method (update (region <region>) dt)
(let ((s (scene region)))
(when (and s (not (frozen? region)))
(update/around s dt))))
(define %identity-matrix (make-identity-matrix4))
(define-method (render (region <region>) alpha)
(let ((s (scene region))
(c (camera region))
(fb (framebuffer region)))
(when (and s c)
(parameterize ((current-camera c))
;; Don't render to the framebuffer if region is frozen. Just
;; draw the frozen frame instead.
(unless (frozen? region)
(with-framebuffer fb
(with-projection (projection-matrix (camera region))
(render/around s alpha))))
(draw-sprite* (framebuffer-texture fb)
(framebuffer-rect region)
%identity-matrix)))))
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