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;;; Sly
;;; Copyright (C) 2014 David Thompson <davet@gnu.org>
;;;
;;; Sly 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.
;;;
;;; Sly 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:
;;
;; Hierarchy of renderable objects using a directed acyclic graph
;; structure.
;;
;;; Code:
(define-module (sly render group)
#:use-module (ice-9 match)
#:use-module (srfi srfi-9)
#:use-module (sly math transform)
#:use-module (sly render shader)
#:use-module (sly render texture)
#:use-module (sly render utils)
#:use-module (sly render camera)
#:use-module (sly render context)
#:use-module (sly render model)
#:export (make-group group
group?
group-transform group-visible? group-children
draw-group
group-move group-place group-show))
;;;
;;; Group
;;;
;; The composite object of the scene graph. Groups have zero or more
;; children, which may be groups or models.
(define-record-type <group>
(%make-group transform visible? children)
group?
(transform group-transform)
(visible? group-visible?)
(children group-children))
(define* (make-group children #:optional #:key (transform identity-transform)
(visible? #t))
"Create a new group containing CHILDREN in which each child is
rendered relative to TRANSFORM. The VISIBLE? flag determines whether
or not to render child nodes."
(%make-group transform visible? children))
(define (%draw-group group parent-transform view context)
(match group
(($ <group> transform visible? children)
(when visible?
(with-temp-transform context world-transform
(transform*! world-transform transform parent-transform)
(for-each (lambda (child)
(let ((draw (match child
((? group? group) %draw-group)
((? model? model) draw-model))))
(draw child world-transform view context)))
children))))))
(define (set-transform-identity! t)
(let ((matrix (transform-matrix t)))
(array-set! matrix 1 0 0)
(array-set! matrix 0 0 1)
(array-set! matrix 0 0 2)
(array-set! matrix 0 0 3)
(array-set! matrix 0 1 0)
(array-set! matrix 1 1 1)
(array-set! matrix 0 1 2)
(array-set! matrix 0 1 3)
(array-set! matrix 0 2 0)
(array-set! matrix 0 2 1)
(array-set! matrix 1 2 2)
(array-set! matrix 0 2 3)
(array-set! matrix 0 3 0)
(array-set! matrix 0 3 1)
(array-set! matrix 0 3 2)
(array-set! matrix 1 3 3)))
(define draw-group
(let ((context (make-render-context)))
(lambda* (group camera #:optional (context context))
"Draw the scene defined by GROUP as viewed by CAMERA, with the given
render CONTEXT."
(with-temp-transform context view
(transform*! view
(camera-location camera)
(camera-projection camera))
(with-temp-transform context base-transform
(set-transform-identity! base-transform)
(apply-viewport (camera-viewport camera))
(%draw-group group base-transform view context))))))
;;;
;;; Utility Procedures
;;;
(define (group . children)
"Create a new group containing the list of CHILDREN."
(make-group children))
(define (group-move position . children)
"Create a new group in which the list of CHILDREN are translated by
the vector POSITION."
(make-group children #:transform (translate position)))
(define (group-place transform . children)
"Create a new group in which the tranformation matrices of the
CHILDREN are multiplied by TRANSFORM."
(make-group children #:transform transform))
(define (group-show visible? . children)
"Create a new group in which the visibility of the list of
CHILDREN is determined by the VISIBLE? flag."
(make-group children #:visible? visible?))
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