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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 depth)
#: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-depth-test
depth-test?
depth-test-write?
depth-test-function
depth-test-near
depth-test-far
basic-depth-test
g:depth-test
current-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 basic-depth-test (make-depth-test))
(define (bind-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))))
(define-graphics-state g:depth-test
current-depth-test
#:default #f
#:bind bind-depth-test)
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