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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:
;;
;; Scene graph
;;
;;; Code:
(define-module (sly scene)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-26)
#:use-module (sly camera)
#:use-module (sly mesh)
#:use-module (sly quaternion)
#:use-module (sly signal)
#:use-module (sly transform)
#:use-module (sly transition)
#:export (scene-node
make-scene-node
scene-node?
scene-node-position scene-node-scale scene-node-rotation
scene-node-uniforms scene-node-children
update-scene-node draw-scene-node
make-scene
scene?
scene-root
update-scene draw-scene))
(define-record-type <scene-node>
(%make-scene-node position scale rotation uniforms children)
scene-node?
(position scene-node-position)
(scale scene-node-scale)
(rotation scene-node-rotation)
(uniforms scene-node-uniforms)
(children scene-node-children))
(define* (make-scene-node #:optional #:key
(position #(0 0))
(scale 1)
(rotation identity-quaternion)
(uniforms '())
(children '())
#:allow-other-keys)
(%make-scene-node position scale rotation uniforms children))
(define-syntax-rule (scene-node (field val) ...)
(apply make-scene-node
(append (list (symbol->keyword 'field) val) ...)))
(define (interpolate current prev alpha)
(if (or (not prev)
(equal? current prev))
current
(vector-interpolate prev current alpha)))
(define* (draw-scene-node node alpha transform #:optional (uniforms '()))
(signal-let ((node node))
(if (mesh? node)
(draw-mesh node `(("mvp" ,transform)
,@uniforms))
(signal-let ((children (scene-node-children node))
(position (scene-node-position node))
(%scale (scene-node-scale node))
(rotation (scene-node-rotation node)))
(let ((node-transform (transform*
(translate position)
(scale %scale)
(quaternion->transform rotation))))
(for-each (cut draw-scene-node <> alpha
(transform* transform node-transform)
(scene-node-uniforms node))
children))))))
;;;
;;; Scene
;;;
(define-record-type <scene>
(make-scene root cameras)
scene?
(root scene-root)
(cameras scene-cameras))
(define (update-scene scene)
"Update the nodes within SCENE."
(update-scene-node (scene-root scene)))
(define (draw-scene scene alpha)
"Draw SCENE from the perspective of CAMERA with interpolation factor
ALPHA."
(for-each (lambda (camera)
(call-with-camera camera
(lambda (projection location)
(draw-scene-node (scene-root scene)
alpha
(transform* projection location)))))
(scene-cameras scene)))
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