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;;; Chickadee Game Toolkit
;;; Copyright © 2020 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 depth)
#:use-module (ice-9 match)
#:use-module (gl)
#:use-module (chickadee render gl)
#:use-module (chickadee render gpu)
#:use-module (srfi srfi-9)
#:export (make-depth-test
depth-test?
depth-test-write?
depth-test-function
depth-test-near
depth-test-far
default-depth-test
apply-depth-test))
(define-record-type <depth-test>
(%make-depth-test write? function near far)
depth-test?
(write? depth-test-write?)
(function depth-test-function)
(near depth-test-near)
(far depth-test-far))
(define* (make-depth-test #:key (write? #t) (function 'less-than) (near 0.0) (far 1.0))
(%make-depth-test write? function near far))
(define default-depth-test (make-depth-test))
(define (apply-depth-test depth-test)
(if depth-test
(let ((glfunc (match (depth-test-function depth-test)
('always (depth-function always))
('never (depth-function never))
('equal (depth-function equal))
('not-equal (depth-function notequal))
('less-than (depth-function less))
('less-than-or-equal (depth-function lequal))
('greater-than (depth-function greater))
('greater-than-or-equal (depth-function gequal)))))
(gl-enable (enable-cap depth-test))
(gl-depth-func glfunc)
(gl-depth-mask (depth-test-write? depth-test))
(gl-depth-range (depth-test-near depth-test) (depth-test-far depth-test)))
(gl-disable (enable-cap depth-test))))
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