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;;; Chickadee Game Toolkit
;;; Copyright © 2016 David Thompson <davet@gnu.org>
;;;
;;; Chickadee 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.
;;;
;;; Chickadee 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
;;; <http://www.gnu.org/licenses/>.
(define-module (chickadee render gpu)
#:use-module (oop goops)
#:use-module (srfi srfi-9)
#:export (make-gpu-state
gpu-state-ref
gpu-state-set!
gpu-finalize
gpu-guard
gpu-reap!))
;;;
;;; GPU state
;;;
(define-record-type <gpu-state>
(make-gpu-state bind value)
gpu-state?
(bind gpu-state-bind)
(value gpu-state-ref %gpu-state-set!))
(define (gpu-state-set! state new-value)
(unless (eq? new-value (gpu-state-ref state))
((gpu-state-bind state) new-value)
(%gpu-state-set! state new-value)))
;;;
;;; GPU finalizers
;;;
(define-generic gpu-finalize)
(define *gpu-guardian* (make-guardian))
(define (gpu-guard obj)
"Protect OBJ for the garbage collector until OBJ has been deleted
from the GPU's memory."
(*gpu-guardian* obj)
obj)
(define (gpu-reap!)
"Delete all GPU objects that are no longer being referenced."
(let loop ((obj (*gpu-guardian*)))
(when obj
(gpu-finalize obj)
(loop (*gpu-guardian*)))))
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