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;;; Sly
;;; Copyright (C) 2014 David Thompson <davet@gnu.org>
;;;
;;; This program 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.
;;;
;;; This program 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:
;;
;; Primitive 2D/3D shapes.
;;
;;; Code:
(define-module (sly render shape)
#:use-module (sly math)
#:use-module (sly render)
#:use-module (sly render mesh)
#:use-module (sly render texture)
#:use-module (sly math vector)
#:export (make-cube))
;; TODO: Write some combinators for composing triangles into more
;; complex shapes with a procedure to convert them into a mesh.
(define* (make-cube size #:optional #:key (texture #f))
(let* ((half-size (half size))
(mesh (build-mesh #(
;; Front
0 3 2 0 2 1
;; Back
4 6 7 4 5 6
;; Top
8 11 10 8 10 9
;; Bottom
12 14 15 12 13 14
;; Left
16 19 18 16 18 17
;; Right
20 22 23 20 21 22)
(vector
;; Front
(vector3 (- half-size) (- half-size) (- half-size))
(vector3 half-size (- half-size) (- half-size))
(vector3 half-size half-size (- half-size))
(vector3 (- half-size) half-size (- half-size))
;; Back
(vector3 (- half-size) (- half-size) half-size)
(vector3 half-size (- half-size) half-size)
(vector3 half-size half-size half-size)
(vector3 (- half-size) half-size half-size)
;; Top
(vector3 (- half-size) half-size (- half-size))
(vector3 half-size half-size (- half-size))
(vector3 half-size half-size half-size)
(vector3 (- half-size) half-size half-size)
;; Bottom
(vector3 (- half-size) (- half-size) (- half-size))
(vector3 half-size (- half-size) (- half-size))
(vector3 half-size (- half-size) half-size)
(vector3 (- half-size) (- half-size) half-size)
;; Left
(vector3 (- half-size) (- half-size) (- half-size))
(vector3 (- half-size) half-size (- half-size))
(vector3 (- half-size) half-size half-size)
(vector3 (- half-size) (- half-size) half-size)
;; Right
(vector3 half-size (- half-size) (- half-size))
(vector3 half-size half-size (- half-size))
(vector3 half-size half-size half-size)
(vector3 half-size (- half-size) half-size))
(let ((s1 (texture-s1 texture))
(t1 (texture-t1 texture))
(s2 (texture-s2 texture))
(t2 (texture-t2 texture)))
(vector
;; Front
(vector2 s1 t1)
(vector2 s2 t1)
(vector2 s2 t2)
(vector2 s1 t2)
;; Back
(vector2 s1 t1)
(vector2 s2 t1)
(vector2 s2 t2)
(vector2 s1 t2)
;; Top
(vector2 s1 t1)
(vector2 s2 t1)
(vector2 s2 t2)
(vector2 s1 t2)
;; Bottom
(vector2 s1 t1)
(vector2 s2 t1)
(vector2 s2 t2)
(vector2 s1 t2)
;; Left
(vector2 s1 t1)
(vector2 s2 t1)
(vector2 s2 t2)
(vector2 s1 t2)
;; Right
(vector2 s1 t1)
(vector2 s2 t1)
(vector2 s2 t2)
(vector2 s1 t2))))))
(with-texture texture
(render-mesh mesh))))
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