content/canvas/test/webgl-conformance/conformance/attribs/gl-vertex-attrib-zero-issues.html@8bccb770b82d
content/canvas/test/webgl-conformance/conformance/attribs/gl-vertex-attrib-zero-issues.html
Wed, 31 Dec 2014 13:27:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 13:27:57 +0100
- branch
- TOR_BUG_3246
- changeset 6
- 8bccb770b82d
- permissions
- -rw-r--r--
Ignore runtime configuration files generated during quality assurance.
1 <!--
2 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
3 // Use of this source code is governed by a BSD-style license that can be
4 // found in the LICENSE file.
5 -->
6 <!DOCTYPE html>
7 <html>
8 <head>
9 <meta charset="utf-8">
10 <title>WebGL Enable Vertex Attrib Zero Test</title>
11 <link rel="stylesheet" href="../../resources/js-test-style.css"/>
12 <script src="../../resources/js-test-pre.js"></script>
13 <script src="../resources/webgl-test.js"> </script>
14 <script src="../resources/webgl-test-utils.js"> </script>
15 </head>
16 <body>
17 <canvas id="example" width="50" height="50">
18 </canvas>
19 <div id="description"></div>
20 <div id="console"></div>
21 <script id="vshader" type="x-shader/x-vertex">
22 attribute vec4 vPosition;
23 void main()
24 {
25 gl_Position = vPosition;
26 }
27 </script>
29 <script id="fshader" type="x-shader/x-fragment">
30 void main()
31 {
32 gl_FragColor = vec4(0.0,0.0,0.0,0.0);
33 }
34 </script>
36 <script>
37 description("Test some of the issues of the difference between attrib 0 on OpenGL vs WebGL");
38 debug("");
39 var wtu = WebGLTestUtils;
40 var gl = wtu.create3DContext("example");
42 function setup(numVerts, attribIndex) {
43 var program = wtu.setupProgram(
44 gl, ['vshader', 'fshader'], ['vPosition'], [attribIndex]);
45 // draw with something on attrib zero with a small number of vertices
46 var vertexObject = gl.createBuffer();
47 g_program = program;
48 g_attribLocation = attribIndex;
49 shouldBe("g_attribLocation", "gl.getAttribLocation(g_program, 'vPosition')");
50 gl.bindBuffer(gl.ARRAY_BUFFER, vertexObject);
51 gl.bufferData(
52 gl.ARRAY_BUFFER, new Float32Array(numVerts * 3), gl.STATIC_DRAW);
53 gl.vertexAttribPointer(attribIndex, 3, gl.FLOAT, false, 0, 0);
54 var indices = new Uint16Array(numVerts);
55 for (var ii = 0; ii < numVerts; ++ii) {
56 indices[ii] = ii;
57 }
58 var indexBuffer = gl.createBuffer();
59 gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, indexBuffer);
60 gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, indices, gl.STATIC_DRAW);
61 return program;
62 }
64 var p1 = setup(3, 0);
65 var p2 = setup(60000, 3);
67 for (var ii = 0; ii < 5; ++ii) {
68 gl.useProgram(p1);
69 gl.enableVertexAttribArray(0);
70 gl.drawElements(gl.TRIANGLES, 3, gl.UNSIGNED_SHORT, 0);
71 glErrorShouldBe(
72 gl, gl.NO_ERROR,
73 "drawing using attrib 0 with 3 verts");
75 gl.useProgram(p2);
76 gl.enableVertexAttribArray(3);
77 gl.drawArrays(gl.LINES, 0, 60000);
78 glErrorShouldBe(
79 gl, gl.NO_ERROR,
80 "drawing using attrib 3 with 60000 verts");
81 }
83 wtu.checkCanvas(gl, [0, 0, 0, 0], "canvas should be 0, 0, 0, 0");
85 successfullyParsed = true;
86 </script>
87 <script>finishTest();</script>
89 </body>
90 </html>
