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;;; Chickadee Game Toolkit
;;; Copyright © 2020, 2021 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.
(define-module (chickadee graphics stencil)
#:use-module (ice-9 match)
#:use-module (gl)
#:use-module (chickadee graphics engine)
#:use-module (chickadee graphics gl)
#:use-module (srfi srfi-9)
#:export (make-stencil-test
stencil-test?
stencil-test-mask-front
stencil-test-mask-back
stencil-test-function-front
stencil-test-function-back
stencil-test-function-mask-front
stencil-test-function-mask-back
stencil-test-reference-front
stencil-test-reference-back
stencil-test-on-fail-front
stencil-test-on-fail-back
stencil-test-on-depth-fail-front
stencil-test-on-depth-fail-back
stencil-test-on-pass-front
stencil-test-on-pass-back
default-stencil-test
g:stencil-test
current-stencil-test))
(define-record-type <stencil-test>
(%make-stencil-test mask-front mask-back function-front function-back
function-mask-front function-mask-back
reference-front reference-back
on-fail-front on-fail-back
on-depth-fail-front on-depth-fail-back
on-pass-front on-pass-back)
stencil-test?
(mask-front stencil-test-mask-front)
(mask-back stencil-test-mask-back)
(function-front stencil-test-function-front)
(function-back stencil-test-function-back)
(function-mask-front stencil-test-function-mask-front)
(function-mask-back stencil-test-function-mask-back)
(reference-front stencil-test-reference-front)
(reference-back stencil-test-reference-back)
(on-fail-front stencil-test-on-fail-front)
(on-fail-back stencil-test-on-fail-back)
(on-depth-fail-front stencil-test-on-depth-fail-front)
(on-depth-fail-back stencil-test-on-depth-fail-back)
(on-pass-front stencil-test-on-pass-front)
(on-pass-back stencil-test-on-pass-back))
(define* (make-stencil-test #:key (mask #xFF) (function 'always)
(function-mask #xFF) (reference 0)
(on-fail 'keep) (on-depth-fail 'keep) (on-pass 'keep)
(mask-front mask) (mask-back mask)
(function-front function) (function-back function)
(function-mask-front function-mask)
(function-mask-back function-mask)
(reference-front reference)
(reference-back reference)
(on-fail-front on-fail) (on-fail-back on-fail)
(on-depth-fail-front on-depth-fail)
(on-depth-fail-back on-depth-fail)
(on-pass-front on-pass) (on-pass-back on-pass))
(%make-stencil-test mask-front mask-back function-front function-back
function-mask-front function-mask-back
reference-front reference-back
on-fail-front on-fail-back
on-depth-fail-front on-depth-fail-back
on-pass-front on-pass-back))
(define default-stencil-test (make-stencil-test))
(define* (bind-stencil-test stencil)
(define (symbol->op sym)
(match sym
('zero (stencil-op zero))
('keep (stencil-op keep))
('replace (stencil-op replace))
('increment (stencil-op incr))
('increment-wrap (version-1-4 incr-wrap))
('decrement (stencil-op decr))
('decrement-wrap (version-1-4 decr-wrap))
('invert (stencil-op invert))))
(define (symbol->function sym)
(match sym
('always (stencil-function always))
('never (stencil-function never))
('less-than (stencil-function less))
('equal (stencil-function equal))
('less-than-or-equal (stencil-function lequal))
('greater-than (stencil-function greater))
('greater-than-or-equal (stencil-function gequal))
('not-equal (stencil-function notequal))))
(if stencil
(begin
(gl-enable (enable-cap stencil-test))
;; Mask
(gl-stencil-mask-separate (cull-face-mode front)
(stencil-test-mask-front stencil))
(gl-stencil-mask-separate (cull-face-mode back)
(stencil-test-mask-back stencil))
;; Function
(gl-stencil-func-separate (cull-face-mode front)
(symbol->function
(stencil-test-function-front stencil))
(stencil-test-reference-front stencil)
(stencil-test-function-mask-front stencil))
(gl-stencil-func-separate (cull-face-mode back)
(symbol->function
(stencil-test-function-back stencil))
(stencil-test-reference-back stencil)
(stencil-test-function-mask-back stencil))
;; Operation
(gl-stencil-op-separate (cull-face-mode front)
(symbol->op (stencil-test-on-fail-front stencil))
(symbol->op (stencil-test-on-depth-fail-front stencil))
(symbol->op (stencil-test-on-pass-front stencil)))
(gl-stencil-op-separate (cull-face-mode back)
(symbol->op (stencil-test-on-fail-back stencil))
(symbol->op (stencil-test-on-depth-fail-back stencil))
(symbol->op (stencil-test-on-pass-back stencil))))
(gl-disable (enable-cap stencil-test))))
(define-graphics-state g:stencil-test
current-stencil-test
#:default default-stencil-test
#:bind bind-stencil-test)
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