1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
;;; Sly
;;; Copyright (C) 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; 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:
;;
;; Scene graph API.
;;
;;; Code:
(define-module (sly scene-graph)
#:use-module (ice-9 hash-table)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-26)
#:use-module (gl)
#:use-module (sly wrappers gl)
#:use-module (sly color)
#:use-module (sly rect)
#:use-module (sly signal)
#:use-module (sly transform)
#:use-module (sly vector)
#:export (make-scene-node
scene-node?
scene-node-transform
scene-node-color
scene-node-texture
scene-node-shader
scene-node-arrays
scene-node-children
draw-scene-node))
;; Types of scene nodes:
;; - Group: position, scale, rotation, children
;; - Vertices: vertex arrays + style (shader, texture)
;; All nodes have the following
;; - transform
;; - children
;; - shader
;; - texture
;; - vertex array
;; (define (sprite)
;; (make-scene-node #:transform (make-transform* #:translate (vector2 100 100))
;; #:color white
;; #:texture (load-texture "images/p1_front.png")
;; #:arrays `((vertex float ,vertices
;; #:stride ,texture-vertex-size
;; #:offset ,x-offset)
;; (texture float ,vertices
;; #:stride ,texture-vertex-size
;; #:offset ,s-offset))
;; #:shader sprite-shader))
;;;
;;; Meshes
;;;
(define-vertex sprite-vertex
(position vector2)
(texcoord vector2))
(define-record-type <geometry>
(make-geometry primitive size arrays)
geometry?
(primitive geometry-primitive)
(size geometry-size)
(arrays geometry-arrays))
(define gl-primitives
(alist->hash-table
'((points . 0)
(lines . 1)
(line-loop . 2)
(line-strip . 3)
(triangles . 4)
(triangle-strip . 5)
(triangle-fan . 6)
(quads . 7)
(quad-strip . 8)
(polygon . 9))))
(define gl-arrays
(alist->hash-table
'((vertex-array . 32884)
(normal-array . 32885)
(color-array . 32886)
(index-array . 32887)
(texture-coord-array . 32888)
(edge-flag-array . 32889))))
(define gl-types
(alist->hash-table
'((byte . 5120)
(unsigned-byte . 5121)
(short . 5122)
(unsigned-short . 5123)
(int . 5124)
(unsigned-int . 5125)
(float . 5126)
(#{2-bytes}# . 5127)
(#{3-bytes}# . 5128)
(#{4-bytes}# . 5129)
(double . 5130)
(double-ext . 5130))))
(define (draw-geometry geometry)
(define (iter arrays)
(cond
((null? arrays)
(let ((primitive (hash-ref gl-primitives (geometry-primitive geometry))))
(gl-draw-arrays primitive 0 (geometry-size geometry))))
(else
(match (car arrays)
((array-type data-type vertices . rest)
(with-gl-client-state (hash-ref gl-arrays array-type)
(set-gl-vertex-array (hash-ref gl-types data-type) vertices)
(iter (cdr arrays))))))))
(iter (geometry-arrays geometry)))
(define foo
'(vertex float #(1 2 3 4) #:stride 4 #:offset 8))
(match foo
((array-type data-type vertices . kwargs)
(format #t "~a ~a ~a\n" array-type data-type vertices)
(let lp ((kwargs kwargs))
(match kwargs
((key value . rest)
(format #t "~a - ~a\n" key value)
(lp rest))
(_ #f)))))
(define-record-type <scene-node>
(%make-scene-node transform color texture shader arrays children)
scene-node?
(transform scene-node-transform)
(color scene-node-color)
(texture scene-node-texture)
(shader scene-node-shader)
(arrays scene-node-arrays)
(primitive scene-node-primitive)
(children scene-node-children))
(define* (make-scene-node #:optional #:key (transform identity-transform)
(color white) (texture #f) (shader #f)
(arrays '()) (children '()))
(%make-scene-node transform color texture shader arrays children))
(define* (draw-scene-node node #:optional (transform identity-transform))
(let ((transform (transform* transform (scene-node-transform node))))
;; WRITEME
(for-each (cut draw-scene-node <> transform)
(scene-node-children node))))
(define (draw-arrays node)
#f)
;; (define (draw-sprite transform)
;; (display "drew a sprite\n"))
;; (define (draw-label transform)
;; (display "drew a label\n"))
;; (define s
;; (make-scene-node
;; #:position (vector2 100 100)
;; #:size (vector2 200 200)
;; #:proc draw-sprite
;; #:children
;; (list (make-scene-node
;; #:position (vector2 50 50)
;; #:size (vector2 50 50)
;; #:rotation 45
;; #:proc draw-label))))
;; (draw-scene-node s)
;; (define scene
;; (scene-graph
;; (sprite
;; (position (vector2 320 240))
;; (texture "logo.png")
;; (anchor 'center))
;; (label
;; (position (vector2 320 160))
;; (text "Some Really Awesome Game")
;; (anchor 'bottom-center))
;; (group
;; (position (vector2 160 300))
;; (children
;; (sprite
;; (position (vector2 16 16))
;; (texture "load-game.png"))
;; (sprite
;; (position (vector2 64 16))
;; (texture "new-game.png"))
;; (sprite
;; (position (vector2 96 16))
;; (texture "options.png"))))))
|
