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;;; Chickadee Game Toolkit
;;; Copyright © 2023 David Thompson <dthompson2@worcester.edu>
;;;
;;; 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
;;
;; Depth/stencil buffer configuration.
;;
;;; Code:
(define-module (chickadee graphics depth-stencil)
#:use-module (ice-9 match)
#:use-module (srfi srfi-9)
#:export (<stencil-face>
make-stencil-face
stencil-face?
stencil-face-compare
stencil-face-fail-op
stencil-face-depth-fail-op
stencil-face-pass-op
<depth+stencil>
make-depth+stencil
depth+stencil?
depth+stencil-format
depth+stencil-depth-write-enabled?
depth+stencil-compare-function
depth+stencil-stencil-front
depth+stencil-stencil-back
depth+stencil-stencil-read-mask
depth+stencil-stencil-write-mask
<depth-operation>
make-depth-operation
depth-operation?
depth-operation-clear-value
depth-operation-load-op
depth-operation-store-op
depth-operation-read-only?
<stencil-operation>
make-stencil-operation
stencil-operation?
stencil-operation-clear-value
stencil-operation-load-op
stencil-operation-store-op
stencil-operation-read-only?))
(define-record-type <stencil-face>
(%make-stencil-face compare fail-op depth-fail-op pass-op)
stencil-face?
(compare stencil-face-compare)
(fail-op stencil-face-fail-op)
(depth-fail-op stencil-face-depth-fail-op)
(pass-op stencil-face-pass-op))
(define* (make-stencil-face #:key (compare 'always) (fail-op 'keep)
(depth-fail-op 'keep) (pass-op 'keep))
(%make-stencil-face compare fail-op depth-fail-op pass-op))
(define-record-type <depth+stencil>
(%make-depth+stencil format depth-write? depth-compare stencil-front
stencil-back stencil-read-mask stencil-write-mask)
depth+stencil?
(format depth+stencil-format)
(depth-write? depth+stencil-depth-write?)
(depth-compare depth+stencil-depth-compare)
(stencil-front depth+stencil-stencil-front)
(stencil-back depth+stencil-stencil-back)
(stencil-read-mask depth+stencil-stencil-read-mask)
(stencil-write-mask depth+stencil-stencil-write-mask))
(define* (make-depth+stencil #:key
(format 'depth24plus-stencil8)
depth-write?
(depth-compare 'less)
(stencil-front (make-stencil-face))
(stencil-back (make-stencil-face))
(stencil-read-mask #xffffFFFF)
(stencil-write-mask #xffffFFFF))
(%make-depth+stencil format depth-write? depth-compare stencil-front
stencil-back stencil-read-mask stencil-write-mask))
(define-record-type <depth-operation>
(%make-depth-operation clear-value load-op store-op read-only?)
depth-operation?
(clear-value depth-operation-clear-value)
(load-op depth-operation-load-op)
(store-op depth-operation-store-op)
(read-only? depth-operation-read-only?))
(define* (make-depth-operation #:key
(clear-value 0.0)
(load-op 'clear)
(store-op 'store)
read-only?)
(%make-depth-operation clear-value load-op store-op read-only?))
(define-record-type <stencil-operation>
(%make-stencil-operation clear-value load-op store-op read-only?)
stencil-operation?
(clear-value stencil-operation-clear-value)
(load-op stencil-operation-load-op)
(store-op stencil-operation-store-op)
(read-only? stencil-operation-read-only?))
(define* (make-stencil-operation #:key
(clear-value #x00000000)
(load-op 'clear)
(store-op 'store)
read-only?)
(%make-stencil-operation clear-value load-op store-op read-only?))
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