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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
|
<!--
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL OES_vertex_array_object Conformance Tests</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../js/js-test-pre.js"></script>
<script src="../../js/webgl-test-utils.js"></script>
<!-- comment in the script tag below to test through JS emulation of the extension. -->
<!--
<script src="../../../demos/google/resources/OESVertexArrayObject.js"></script>
-->
</head>
<body>
<div id="description"></div>
<canvas id="canvas" style="width: 50px; height: 50px;"> </canvas>
<div id="console"></div>
<script id="vshader" type="x-shader/x-vertex">
attribute vec4 a_position;
attribute vec4 a_color;
varying vec4 v_color;
void main(void) {
gl_Position = a_position;
v_color = a_color;
}
</script>
<script id="fshader" type="x-shader/x-fragment">
precision mediump float;
varying vec4 v_color;
void main(void) {
gl_FragColor = v_color;
}
</script>
<script>
"use strict";
description("This test verifies the functionality of the OES_vertex_array_object extension, if it is available.");
debug("");
var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = wtu.create3DContext(canvas);
var ext = null;
var vao = null;
var contextA;
var contextB;
var extA;
var extB;
var vertexArrayA;
var vertexArrayB;
if (!gl) {
testFailed("WebGL context does not exist");
} else {
testPassed("WebGL context exists");
// Setup emulated OESVertexArrayObject if it has been included.
if (window.setupVertexArrayObject) {
debug("using emulated OES_vertex_array_object");
setupVertexArrayObject(gl);
}
// Run tests with extension disabled
runBindingTestDisabled();
// Query the extension and store globally so shouldBe can access it
ext = gl.getExtension("OES_vertex_array_object");
if (!ext) {
testPassed("No OES_vertex_array_object support -- this is legal");
runSupportedTest(false);
} else {
testPassed("Successfully enabled OES_vertex_array_object extension");
runSupportedTest(true);
runBindingTestEnabled();
runObjectTest();
runAttributeTests();
runAttributeValueTests();
runDrawTests();
runUnboundDeleteTests();
runBoundDeleteTests();
runArrayBufferBindTests();
runInvalidContextTests();
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
}
}
function runSupportedTest(extensionEnabled) {
var supported = gl.getSupportedExtensions();
if (supported.indexOf("OES_vertex_array_object") >= 0) {
if (extensionEnabled) {
testPassed("OES_vertex_array_object listed as supported and getExtension succeeded");
} else {
testFailed("OES_vertex_array_object listed as supported but getExtension failed");
}
} else {
if (extensionEnabled) {
testFailed("OES_vertex_array_object not listed as supported but getExtension succeeded");
} else {
testPassed("OES_vertex_array_object not listed as supported and getExtension failed -- this is legal");
}
}
}
function runBindingTestDisabled() {
debug("");
debug("Testing binding enum with extension disabled");
// Use the constant directly as we don't have the extension
var VERTEX_ARRAY_BINDING_OES = 0x85B5;
gl.getParameter(VERTEX_ARRAY_BINDING_OES);
wtu.glErrorShouldBe(gl, gl.INVALID_ENUM, "VERTEX_ARRAY_BINDING_OES should not be queryable if extension is disabled");
}
function runBindingTestEnabled() {
debug("");
debug("Testing binding enum with extension enabled");
shouldBe("ext.VERTEX_ARRAY_BINDING_OES", "0x85B5");
gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "VERTEX_ARRAY_BINDING_OES query should succeed if extension is enabled");
// Default value is null
if (gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES) === null) {
testPassed("Default value of VERTEX_ARRAY_BINDING_OES is null");
} else {
testFailed("Default value of VERTEX_ARRAY_BINDING_OES is not null");
}
debug("");
debug("Testing binding a VAO");
var vao0 = ext.createVertexArrayOES();
var vao1 = ext.createVertexArrayOES();
shouldBeNull("gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES)");
ext.bindVertexArrayOES(vao0);
if (gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES) == vao0) {
testPassed("gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES) is expected VAO");
} else {
testFailed("gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES) is not expected VAO")
}
ext.bindVertexArrayOES(vao1);
if (gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES) == vao1) {
testPassed("gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES) is expected VAO");
} else {
testFailed("gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES) is not expected VAO")
}
ext.deleteVertexArrayOES(vao1);
shouldBeNull("gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES)");
ext.bindVertexArrayOES(vao1);
wtu.glErrorShouldBe(gl, gl.INVALID_OPERATION, "binding a deleted vertex array object");
ext.bindVertexArrayOES(null);
shouldBeNull("gl.getParameter(ext.VERTEX_ARRAY_BINDING_OES)");
ext.deleteVertexArrayOES(vao1);
}
function runObjectTest() {
debug("");
debug("Testing object creation");
vao = ext.createVertexArrayOES();
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "createVertexArrayOES should not set an error");
shouldBeNonNull("vao");
// Expect false if never bound
shouldBeFalse("ext.isVertexArrayOES(vao)");
ext.bindVertexArrayOES(vao);
shouldBeTrue("ext.isVertexArrayOES(vao)");
ext.bindVertexArrayOES(null);
shouldBeTrue("ext.isVertexArrayOES(vao)");
shouldBeFalse("ext.isVertexArrayOES(null)");
ext.deleteVertexArrayOES(vao);
vao = null;
}
function runAttributeTests() {
debug("");
debug("Testing attributes work across bindings");
var states = [];
var attrCount = gl.getParameter(gl.MAX_VERTEX_ATTRIBS);
for (var n = 0; n < attrCount; n++) {
gl.bindBuffer(gl.ARRAY_BUFFER, null);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
var state = {};
states.push(state);
var vao = state.vao = ext.createVertexArrayOES();
ext.bindVertexArrayOES(vao);
var enableArray = (n % 2 == 0);
if (enableArray) {
gl.enableVertexAttribArray(n);
} else {
gl.disableVertexAttribArray(n);
}
if (enableArray) {
var buffer = state.buffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, 1024, gl.STATIC_DRAW);
gl.vertexAttribPointer(n, 1 + n % 4, gl.FLOAT, true, n * 4, n * 4);
}
if (enableArray) {
var elbuffer = state.elbuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elbuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, 1024, gl.STATIC_DRAW);
}
ext.bindVertexArrayOES(null);
}
var anyMismatch = false;
for (var n = 0; n < attrCount; n++) {
var state = states[n];
ext.bindVertexArrayOES(state.vao);
var shouldBeEnabled = (n % 2 == 0);
var isEnabled = gl.getVertexAttrib(n, gl.VERTEX_ATTRIB_ARRAY_ENABLED);
if (shouldBeEnabled != isEnabled) {
testFailed("VERTEX_ATTRIB_ARRAY_ENABLED not preserved");
anyMismatch = true;
}
var buffer = gl.getVertexAttrib(n, gl.VERTEX_ATTRIB_ARRAY_BUFFER_BINDING);
if (shouldBeEnabled) {
if (buffer == state.buffer) {
// Matched
if ((gl.getVertexAttrib(n, gl.VERTEX_ATTRIB_ARRAY_SIZE) == 1 + n % 4) &&
(gl.getVertexAttrib(n, gl.VERTEX_ATTRIB_ARRAY_TYPE) == gl.FLOAT) &&
(gl.getVertexAttrib(n, gl.VERTEX_ATTRIB_ARRAY_NORMALIZED) == true) &&
(gl.getVertexAttrib(n, gl.VERTEX_ATTRIB_ARRAY_STRIDE) == n * 4) &&
(gl.getVertexAttribOffset(n, gl.VERTEX_ATTRIB_ARRAY_POINTER) == n * 4)) {
// Matched
} else {
testFailed("VERTEX_ATTRIB_ARRAY_* not preserved");
anyMismatch = true;
}
} else {
testFailed("VERTEX_ATTRIB_ARRAY_BUFFER_BINDING not preserved");
anyMismatch = true;
}
} else {
// GL_CURRENT_VERTEX_ATTRIB is not preserved
if (buffer) {
testFailed("VERTEX_ATTRIB_ARRAY_BUFFER_BINDING not preserved");
anyMismatch = true;
}
}
var elbuffer = gl.getParameter(gl.ELEMENT_ARRAY_BUFFER_BINDING);
if (shouldBeEnabled) {
if (elbuffer == state.elbuffer) {
// Matched
} else {
testFailed("ELEMENT_ARRAY_BUFFER_BINDING not preserved");
anyMismatch = true;
}
} else {
if (elbuffer == null) {
// Matched
} else {
testFailed("ELEMENT_ARRAY_BUFFER_BINDING not preserved");
anyMismatch = true;
}
}
}
ext.bindVertexArrayOES(null);
if (!anyMismatch) {
testPassed("All attributes preserved across bindings");
}
for (var n = 0; n < attrCount; n++) {
var state = states[n];
ext.deleteVertexArrayOES(state.vao);
}
}
function runAttributeValueTests() {
debug("");
debug("Testing that attribute values are not attached to bindings");
var v;
var vao0 = ext.createVertexArrayOES();
var anyFailed = false;
ext.bindVertexArrayOES(null);
gl.vertexAttrib4f(0, 0, 1, 2, 3);
v = gl.getVertexAttrib(0, gl.CURRENT_VERTEX_ATTRIB);
if (!(v[0] == 0 && v[1] == 1 && v[2] == 2 && v[3] == 3)) {
testFailed("Vertex attrib value not round-tripped?");
anyFailed = true;
}
ext.bindVertexArrayOES(vao0);
v = gl.getVertexAttrib(0, gl.CURRENT_VERTEX_ATTRIB);
if (!(v[0] == 0 && v[1] == 1 && v[2] == 2 && v[3] == 3)) {
testFailed("Vertex attrib value reset across bindings");
anyFailed = true;
}
gl.vertexAttrib4f(0, 4, 5, 6, 7);
ext.bindVertexArrayOES(null);
v = gl.getVertexAttrib(0, gl.CURRENT_VERTEX_ATTRIB);
if (!(v[0] == 4 && v[1] == 5 && v[2] == 6 && v[3] == 7)) {
testFailed("Vertex attrib value bound to buffer");
anyFailed = true;
}
if (!anyFailed) {
testPassed("Vertex attribute values are not attached to bindings")
}
ext.bindVertexArrayOES(null);
ext.deleteVertexArrayOES(vao0);
}
function runDrawTests() {
debug("");
debug("Testing draws with various VAO bindings");
canvas.width = 50; canvas.height = 50;
gl.viewport(0, 0, canvas.width, canvas.height);
var vao0 = ext.createVertexArrayOES();
var vao1 = ext.createVertexArrayOES();
var vao2 = ext.createVertexArrayOES();
var positionLocation = 0;
var colorLocation = 1;
var program = wtu.setupSimpleVertexColorProgram(gl, positionLocation, colorLocation);
function setupQuad(s, colorsInArray) {
var vertexObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
1.0 * s, 1.0 * s, 0.0,
-1.0 * s, 1.0 * s, 0.0,
-1.0 * s, -1.0 * s, 0.0,
1.0 * s, 1.0 * s, 0.0,
-1.0 * s, -1.0 * s, 0.0,
1.0 * s, -1.0 * s, 0.0]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(positionLocation);
gl.vertexAttribPointer(positionLocation, 3, gl.FLOAT, false, 0, 0);
// Test switching between VAOs that have different number of enabled arrays
if (colorsInArray) {
var vertexObject = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
0.0, 0.0, 0.0, 1.0,
0.0, 0.0, 0.0, 1.0,
0.0, 0.0, 0.0, 1.0,
0.0, 0.0, 0.0, 1.0,
0.0, 0.0, 0.0, 1.0,
0.0, 0.0, 0.0, 1.0]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(colorLocation);
gl.vertexAttribPointer(colorLocation, 4, gl.FLOAT, false, 0, 0);
} else {
gl.disableVertexAttribArray(colorLocation);
}
};
function verifyDiagonalPixels(s, expectedInside, drawDescription) {
// Tests pixels along a diagonal running from the center of the canvas to the (0, 0) corner.
// Values on the points list indicate relative position along this diagonal.
var points = [0.0, 0.2, 0.4, 0.6, 0.8, 1.0];
for (var n = 0; n < points.length; n++) {
var expected = points[n] <= s ? expectedInside : 255;
var x = Math.round((1 - points[n]) * canvas.width / 2);
var y = Math.round((1 - points[n]) * canvas.height / 2);
wtu.checkCanvasRect(gl, x, y, 1, 1, [expected, expected, expected, 255],
"Drawing " + drawDescription + " should pass", 2);
}
};
function verifyDraw(drawDescription, s, colorsInArray) {
wtu.clearAndDrawUnitQuad(gl);
var expectedInside = colorsInArray ? 0 : 128;
verifyDiagonalPixels(s, expectedInside, drawDescription);
};
// Setup all bindings
setupQuad(1, true);
ext.bindVertexArrayOES(vao0);
setupQuad(0.5, true);
ext.bindVertexArrayOES(vao1);
setupQuad(0.25, true);
ext.bindVertexArrayOES(vao2);
setupQuad(0.75, false);
gl.vertexAttrib4f(colorLocation, 0.5, 0.5, 0.5, 1);
// Verify drawing
ext.bindVertexArrayOES(null);
verifyDraw("with the default VAO", 1, true);
ext.bindVertexArrayOES(vao0);
verifyDraw("with VAO #0", 0.5, true);
ext.bindVertexArrayOES(vao1);
verifyDraw("with VAO #1", 0.25, true);
ext.bindVertexArrayOES(vao2);
verifyDraw("with VAO that has the color array disabled", 0.75, false);
// Verify bound VAO after delete
ext.bindVertexArrayOES(vao1);
ext.deleteVertexArrayOES(vao0);
verifyDraw("after deleting another VAO", 0.25, true);
ext.deleteVertexArrayOES(vao1);
verifyDraw("after deleting the VAO that was bound", 1, true);
// Disable global vertex attrib array
gl.disableVertexAttribArray(positionLocation);
gl.disableVertexAttribArray(colorLocation);
// Check that constant values are treated correctly as not being part of VAO state.
var positionLoc = 0;
var colorLoc = 1;
var gridRes = 1;
wtu.setupIndexedQuad(gl, gridRes, positionLoc);
// Set the vertex color to red.
gl.vertexAttrib4f(colorLoc, 1, 0, 0, 1);
var vao0 = ext.createVertexArrayOES();
ext.bindVertexArrayOES(vao0);
var program = wtu.setupSimpleVertexColorProgram(gl, positionLoc, colorLoc);
wtu.setupIndexedQuad(gl, gridRes, positionLoc);
// Set the vertex color to green.
gl.vertexAttrib4f(colorLoc, 0, 1, 0, 1);
wtu.clearAndDrawIndexedQuad(gl, gridRes);
wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
ext.deleteVertexArrayOES(vao0);
wtu.clearAndDrawIndexedQuad(gl, gridRes);
wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
}
function runUnboundDeleteTests() {
debug("");
debug("Testing using buffers that are deleted when attached to unbound VAOs");
var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_position", "a_color"]);
gl.useProgram(program);
var positionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
1.0, 1.0,
-1.0, 1.0,
-1.0, -1.0,
1.0, -1.0]),
gl.STATIC_DRAW);
var colors = [
[255, 0, 0, 255],
[ 0, 255, 0, 255],
[ 0, 0, 255, 255],
[ 0, 255, 255, 255]
];
var colorBuffers = [];
var elementBuffers = [];
var vaos = [];
for (var ii = 0; ii < colors.length; ++ii) {
var vao = ext.createVertexArrayOES();
vaos.push(vao);
ext.bindVertexArrayOES(vao);
// Set the position buffer
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
var elementBuffer = gl.createBuffer();
elementBuffers.push(elementBuffer);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elementBuffer);
gl.bufferData(
gl.ELEMENT_ARRAY_BUFFER,
new Uint8Array([0, 1, 2, 0, 2, 3]),
gl.STATIC_DRAW);
// Setup the color attrib
var color = colors[ii];
if (ii < 3) {
var colorBuffer = gl.createBuffer();
colorBuffers.push(colorBuffer);
gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array(
[ color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3],
color[0], color[1], color[2], color[3]
]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(1);
gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, 0);
} else {
gl.vertexAttrib4f(1, color[0] / 255, color[1] / 255, color[2] / 255, color[3] / 255);
}
}
// delete the color buffers AND the position buffer.
ext.bindVertexArrayOES(null);
for (var ii = 0; ii < colorBuffers.length; ++ii) {
gl.deleteBuffer(colorBuffers[ii]);
gl.deleteBuffer(elementBuffers[ii]);
ext.bindVertexArrayOES(vaos[ii]);
var boundBuffer = gl.getVertexAttrib(1, gl.VERTEX_ATTRIB_ARRAY_BUFFER_BINDING);
// The buffers should still be valid at this point, since it was attached to the VAO
if(boundBuffer != colorBuffers[ii]) {
testFailed("buffer removed even though it is still attached to a VAO");
}
}
ext.bindVertexArrayOES(null);
gl.deleteBuffer(positionBuffer);
// Render with the deleted buffers. As they are referenced by VAOs they
// must still be around.
for (var ii = 0; ii < colors.length; ++ii) {
var color = colors[ii];
ext.bindVertexArrayOES(vaos[ii]);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_BYTE, 0);
wtu.checkCanvas(gl, color, "should be " + color);
}
// Clean up.
for (var ii = 0; ii < colorBuffers.length; ++ii) {
ext.deleteVertexArrayOES(vaos[ii]);
}
for (var ii = 0; ii < colorBuffers.length; ++ii) {
// The buffers should no longer be valid now that the VAOs are deleted
if(gl.isBuffer(colorBuffers[ii])) {
testFailed("buffer not properly cleaned up after VAO deletion");
}
}
}
function runBoundDeleteTests() {
debug("Testing using buffers that are deleted when attached to bound VAOs");
var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_position", "a_color"]);
gl.useProgram(program);
var positionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
1.0, 1.0,
-1.0, 1.0,
-1.0, -1.0,
1.0, -1.0]),
gl.STATIC_DRAW);
// Setup the color attrib
var colorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array(
[ 255, 0, 0, 255,
0, 255, 0, 255,
0, 0, 255, 255,
0, 255, 255, 255
]), gl.STATIC_DRAW);
var vaos = [];
var elementBuffers = [];
for (var ii = 0; ii < 4; ++ii) {
var vao = ext.createVertexArrayOES();
vaos.push(vao);
ext.bindVertexArrayOES(vao);
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 2, gl.FLOAT, false, 0, 0);
var elementBuffer = gl.createBuffer();
elementBuffers.push(elementBuffer);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elementBuffer);
gl.bufferData(
gl.ELEMENT_ARRAY_BUFFER,
new Uint8Array([0, 1, 2, 0, 2, 3]),
gl.STATIC_DRAW);
gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
gl.enableVertexAttribArray(1);
gl.vertexAttribPointer(1, 4, gl.UNSIGNED_BYTE, true, 0, 0);
}
// delete the color buffers AND the position buffer, that are bound to the current VAO
for (var ii = 0; ii < vaos.length; ++ii) {
ext.bindVertexArrayOES(vaos[ii]);
gl.deleteBuffer(colorBuffer);
gl.deleteBuffer(positionBuffer);
// After the first iteration, deleteBuffer will be a no-op, and will not unbind its matching
// bind points on the now-bound VAO like it did on the first iteration.
var expectRetained = (ii != 0);
var shouldBeStr = (expectRetained ? "retained" : "cleared");
var boundPositionBuffer = gl.getVertexAttrib(0, gl.VERTEX_ATTRIB_ARRAY_BUFFER_BINDING);
if (expectRetained != (boundPositionBuffer == positionBuffer)) {
testFailed("Position attrib stored buffer should be " + shouldBeStr + ".");
}
var boundColorBuffer = gl.getVertexAttrib(1, gl.VERTEX_ATTRIB_ARRAY_BUFFER_BINDING);
if (expectRetained != (boundColorBuffer == colorBuffer)) {
testFailed("Color attrib stored buffer should be " + shouldBeStr + ".");
}
// If retained, everything should still work. If cleared, drawing should now fail.
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_BYTE, 0);
var expectedError = (expectRetained ? gl.NO_ERROR : gl.INVALID_OPERATION);
wtu.glErrorShouldBe(gl, expectedError,
"Draw call should " + (expectRetained ? "not " : "") + "fail.");
if (gl.isBuffer(positionBuffer)) {
testFailed("References from unbound VAOs don't keep Position buffer alive.");
}
if (gl.isBuffer(colorBuffer)) {
testFailed("References from unbound VAOs don't keep Color buffer alive");
}
}
}
function runArrayBufferBindTests() {
debug("");
debug("Testing that buffer bindings on VAOs don't affect default VAO ARRAY_BUFFER binding.");
ext.bindVertexArrayOES(null);
var program = wtu.setupProgram(gl, ["vshader", "fshader"], ["a_color", "a_position"]);
gl.useProgram(program);
// create shared element buffer
var elementBuffer = gl.createBuffer();
// bind to default
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elementBuffer);
gl.bufferData(
gl.ELEMENT_ARRAY_BUFFER,
new Uint8Array([0, 1, 2, 0, 2, 3]),
gl.STATIC_DRAW);
// first create the buffers for no VAO draw.
var nonVAOColorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, nonVAOColorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array(
[ 0, 255, 0, 255,
0, 255, 0, 255,
0, 255, 0, 255,
0, 255, 0, 255,
]), gl.STATIC_DRAW);
// shared position buffer.
var positionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
gl.bufferData(
gl.ARRAY_BUFFER,
new Float32Array([
1.0, 1.0,
-1.0, 1.0,
-1.0, -1.0,
1.0, -1.0]),
gl.STATIC_DRAW);
// attach position buffer to default
gl.enableVertexAttribArray(1);
gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
// now create VAO
var vao = ext.createVertexArrayOES();
ext.bindVertexArrayOES(vao);
// attach the position buffer VAO
gl.enableVertexAttribArray(1);
gl.vertexAttribPointer(1, 2, gl.FLOAT, false, 0, 0);
var vaoColorBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vaoColorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new Uint8Array(
[ 255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
255, 0, 0, 255,
]), gl.STATIC_DRAW);
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 4, gl.UNSIGNED_BYTE, true, 0, 0);
// now set the buffer back to the nonVAOColorBuffer
gl.bindBuffer(gl.ARRAY_BUFFER, nonVAOColorBuffer);
// bind to VAO
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, elementBuffer);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_BYTE, 0);
wtu.checkCanvas(gl, [255, 0, 0, 255], "should be red");
// unbind VAO
ext.bindVertexArrayOES(null);
// At this point the nonVAOColorBuffer should be still be bound.
// If the WebGL impl is emulating VAOs it must make sure
// it correctly restores this binding.
gl.enableVertexAttribArray(0);
gl.vertexAttribPointer(0, 4, gl.UNSIGNED_BYTE, true, 0, 0);
gl.drawElements(gl.TRIANGLES, 6, gl.UNSIGNED_BYTE, 0);
wtu.checkCanvas(gl, [0, 255, 0, 255], "should be green");
}
function runInvalidContextTests() {
contextA = wtu.create3DContext(undefined, undefined, 1);
contextB = wtu.create3DContext(undefined, undefined, 1);
extA = contextA.getExtension("OES_vertex_array_object");
extB = contextB.getExtension("OES_vertex_array_object");
vertexArrayA = extA.createVertexArrayOES();
vertexArrayB = extB.createVertexArrayOES();
wtu.shouldGenerateGLError(contextA, contextA.NO_ERROR, "extA.bindVertexArrayOES(vertexArrayA)");
wtu.shouldGenerateGLError(contextA, contextA.NO_ERROR, "extA.bindVertexArrayOES(null)");
wtu.shouldGenerateGLError(contextB, contextB.NO_ERROR, "extB.bindVertexArrayOES(vertexArrayB)");
wtu.shouldGenerateGLError(contextB, contextB.NO_ERROR, "extB.bindVertexArrayOES(null)");
debug("")
debug("State queries validate context");
shouldBeFalse("extA.isVertexArrayOES(vertexArrayB)");
wtu.glErrorShouldBe(contextA, gl.NO_ERROR, "there should be no errors from invalid request");
shouldBeFalse("extB.isVertexArrayOES(vertexArrayA)");
wtu.glErrorShouldBe(contextB, gl.NO_ERROR, "there should be no errors from invalid request");
shouldBeTrue("extA.isVertexArrayOES(vertexArrayA)");
wtu.glErrorShouldBe(contextA, gl.NO_ERROR, "there should be no errors from valid request");
shouldBeTrue("extB.isVertexArrayOES(vertexArrayB)");
wtu.glErrorShouldBe(contextB, gl.NO_ERROR, "there should be no errors from valid request");
debug("")
debug("Deleting an object from another context generates an error");
wtu.shouldGenerateGLError(contextA, contextA.INVALID_OPERATION, "extA.deleteVertexArrayOES(vertexArrayB)");
wtu.shouldGenerateGLError(contextB, contextB.INVALID_OPERATION, "extB.deleteVertexArrayOES(vertexArrayA)");
debug("")
debug("Invalid delete operations do not delete");
shouldBeTrue("extA.isVertexArrayOES(vertexArrayA)");
shouldBeTrue("extB.isVertexArrayOES(vertexArrayB)");
debug("")
debug("Cannot bind VAOs from other contexts");
wtu.shouldGenerateGLError(contextA, contextA.INVALID_OPERATION, "extA.bindVertexArrayOES(vertexArrayB)");
wtu.shouldGenerateGLError(contextB, contextB.INVALID_OPERATION, "extB.bindVertexArrayOES(vertexArrayA)");
debug("")
debug("Context checks happen even for deleted objects");
wtu.shouldGenerateGLError(contextA, contextA.NO_ERROR, "extA.deleteVertexArrayOES(vertexArrayA)");
wtu.shouldGenerateGLError(contextB, contextB.NO_ERROR, "extB.deleteVertexArrayOES(vertexArrayB)");
wtu.shouldGenerateGLError(contextA, contextA.INVALID_OPERATION, "extA.deleteVertexArrayOES(vertexArrayB)");
wtu.shouldGenerateGLError(contextB, contextB.INVALID_OPERATION, "extB.deleteVertexArrayOES(vertexArrayA)");
}
debug("");
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
