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;;; Chickadee Game Toolkit
;;; Copyright © 2021 David Thompson <dthompson2@worcester.edu>
;;;
;;; 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/>.
;;; Commentary:
;;
;; 3D Skybox
;;
;;; Code:
(define-module (chickadee graphics skybox)
#:use-module (chickadee config)
#:use-module (chickadee graphics buffer)
#:use-module (chickadee graphics blend)
#:use-module (chickadee graphics color)
#:use-module (chickadee graphics depth)
#:use-module (chickadee graphics engine)
#:use-module (chickadee graphics polygon)
#:use-module (chickadee graphics shader)
#:use-module (chickadee graphics texture)
#:use-module (srfi srfi-9)
#:export (make-skybox
skybox?
skybox-cube-map
skybox-mesh
default-skybox
draw-skybox))
(define-record-type <skybox>
(%make-skybox cube-map vertex-array)
skybox?
(cube-map skybox-cube-map)
(vertex-array skybox-vertex-array))
(define (make-skybox cube-map)
(let* ((index (u32vector 0 3 2 0 2 1
4 7 6 4 6 5
8 11 10 8 10 9
12 15 14 12 14 13
16 19 18 16 18 17
20 23 22 20 22 21))
(verts (f32vector -1.0 -1.0 -1.0 ; bottom
1.0 -1.0 -1.0
1.0 -1.0 1.0
-1.0 -1.0 1.0
-1.0 1.0 -1.0 ; top
1.0 1.0 -1.0
1.0 1.0 1.0
-1.0 1.0 1.0
-1.0 -1.0 -1.0 ; left
-1.0 1.0 -1.0
-1.0 1.0 1.0
-1.0 -1.0 1.0
1.0 -1.0 -1.0 ; right
1.0 1.0 -1.0
1.0 1.0 1.0
1.0 -1.0 1.0
-1.0 -1.0 1.0 ; front
1.0 -1.0 1.0
1.0 1.0 1.0
-1.0 1.0 1.0
-1.0 -1.0 -1.0 ; back
1.0 -1.0 -1.0
1.0 1.0 -1.0
-1.0 1.0 -1.0))
(index-buffer (make-buffer index #:target 'index))
(vertex-buffer (make-buffer verts))
(indices (make-vertex-attribute #:buffer index-buffer
#:type 'scalar
#:component-type 'unsigned-int))
(positions (make-vertex-attribute #:buffer vertex-buffer
#:type 'vec3
#:component-type 'float))
(va (make-vertex-array #:indices indices
#:attributes `((0 . ,positions)))))
(%make-skybox cube-map va)))
;; A default, dark gray skybox.
(define %default-skybox
(delay
(let ((face (list (u32vector #xff202020
#xff202020
#xff202020
#xff202020)
2 2)))
(make-skybox (make-cube-map (make-list 6 face))))))
(define (default-skybox)
(force %default-skybox))
(define %skybox-shader
(delay (load-shader (scope-datadir "shaders/skybox-vert.glsl")
(scope-datadir "shaders/skybox-frag.glsl"))))
(define (skybox-shader)
(force %skybox-shader))
(define (draw-skybox skybox view)
(with-graphics-state ((g:texture-0 (skybox-cube-map skybox)))
(shader-apply (skybox-shader) (skybox-vertex-array skybox)
#:view view
#:projection (current-projection))))
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