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
|
<!--
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_bufferData 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 emualation 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 drawing results when using gl.bufferData with the OES_vertex_array_object extension.");
debug("");
var wtu = WebGLTestUtils;
var canvas = document.getElementById("canvas");
var gl = wtu.create3DContext(canvas);
var ext = null;
var vao = null;
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 emuated OES_vertex_array_object");
setupVertexArrayObject(gl);
}
// 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");
} else {
testPassed("Successfully enabled OES_vertex_array_object extension");
runBufferDataTest();
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "there should be no errors");
}
}
/**
* The OES_vertex_array_object extension seems to work incorrectly on some handheld devices,
* namely the Nexus 5, and Nexus 7 (in 2014/01) when using bufferData before binding the VAO.
* The tested OS was Android KitKat 4.4.2, the effects were the same in all tested browsers
* (Chrome, Chrome Beta, Firefox, Firefox Beta), so it is likely a driver bug.
* These devices have the similar Adreno 320 and Adreno 330 GPUs respectively.
*
* The issuse resulted from this sequence of actions in a requestAnimationFrame loop:
* 1. upload some vertex buffers with gl.bufferData (eg. colors)
* 2. bind the VAO
* 3. clear the canvas
* 4. draw (some triangles) to the canvas
* 5. unbind the VAO
*
* This caused the drawn triangles to be drawn with black (0) for most of the frames, with some
* rare frames presenting the correct render results. Interestingly on both devices exactly every
* 64th frame passed (starting with the very first one), the others failed.
* (Because of this, we test multiple frames.)
* When positions were uploaded, seemingly nothing was drawn, that's likely because the
* position buffer was also all 0s.
*
* The issue did not occur:
* - if step 1. and 2. were swapped
* - or if step5 was ommited (probably because that makes step 2 a no-op since the VAO is bound)
*/
function runBufferDataTest() {
debug("Testing draws with bufferData");
canvas.width = 50; canvas.height = 50;
gl.viewport(0, 0, canvas.width, canvas.height);
var testColor = [0, 255, 0, 255];
var clearColor = [255, 0, 0, 255];
// Where the issue occures, this is the sequence of success/failure every time:
// result: success fail fail fail fail ... success fail fail ...
// currentTestCount: 0 1 2 3 4 ... 64 65 66 ...
// So with just 1 test it passes, but 2 tests are enough. Here we use 3.
var numberOfTests = 3;
var currentTestCount = 0;
var positionLoc = 0;
var colorLoc = 1;
var gridRes = 1;
var program = wtu.setupSimpleVertexColorProgram(gl, positionLoc, colorLoc);
var vao0 = ext.createVertexArrayOES();
ext.bindVertexArrayOES(vao0);
var buffers = wtu.setupIndexedQuadWithOptions(gl,
{ gridRes: gridRes,
positionLocation: positionLoc
});
var colorTypedArray = createColorTypedArray();
var colorBuffer = gl.createBuffer(gl.ARRAY_BUFFER);
gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
gl.enableVertexAttribArray(colorLoc);
gl.vertexAttribPointer(colorLoc, 4, gl.FLOAT, false, 0, 0);
ext.bindVertexArrayOES(null);
testDrawing();
function testDrawing() {
// this order works fine:
// ext.bindVertexArrayOES(vao0);
// uploadColor();
// this order doesn't:
uploadColor();
ext.bindVertexArrayOES(vao0);
wtu.clearAndDrawIndexedQuad(gl, 1, clearColor);
ext.bindVertexArrayOES(null);
//debug("<span>"+currentTestCount+"</span");
wtu.checkCanvas(gl, testColor, "should be green")
if (++currentTestCount < numberOfTests) {
testDrawing();
// wtu.requestAnimFrame(testDrawing);
} else {
// clean up
ext.deleteVertexArrayOES(vao0);
}
}
function uploadColor() {
gl.bindBuffer(gl.ARRAY_BUFFER, colorBuffer);
gl.bufferData(gl.ARRAY_BUFFER, colorTypedArray, gl.STREAM_DRAW);
}
function createColorTypedArray() {
var colors = [];
var pOffset = 0;
for (var yy = 0; yy <= gridRes; ++yy) {
for (var xx = 0; xx <= gridRes; ++xx) {
colors[pOffset + 0] = testColor[0];
colors[pOffset + 1] = testColor[1];
colors[pOffset + 2] = testColor[2];
colors[pOffset + 3] = testColor[3];
pOffset += 4;
}
}
return new Float32Array(colors);
}
}
debug("");
var successfullyParsed = true;
</script>
<script src="../../js/js-test-post.js"></script>
</body>
</html>
|
