point-no-attributes-stress.html

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<!--

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">

<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>

<script id="vshader" type="x-shader/x-vertex">

void main()

    gl_PointSize = 1.0;

    gl_Position = vec4(0.0, 0.0, 0.0, 1.0);

</script>

<script id="fshader" type="x-shader/x-fragment">

precision mediump float;

void main()

    gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);

</script>

</head>

<body>

<canvas id="testbed" width="1" height="1" style="width: 100px; height: 100px;"></canvas>

<div id="description"></div>

<div id="console"></div>

<script>

"use strict";

description('Stress test drawing a huge number of points without enabling any attributes');

debug('This test stresses drawing a large number of points and workarounds created to run WebGL with simulated attrib 0');

if (confirm('After clicking OK your machine may become unresponsive or crash.')) {

  var wtu = WebGLTestUtils;

  var gl = wtu.create3DContext('testbed');

  var program1 = wtu.setupProgram(gl, ['vshader', 'fshader']);

  gl.enable(gl.BLEND);

  debug('Draw 2^31 points with a shader that takes no attributes and verify it fills the whole canvas.');

  gl.drawArrays(gl.POINTS, 0, Math.pow(2, 31) - 1);

  wtu.glErrorShouldBe(gl, gl.NO_ERROR);

  wtu.checkCanvas(gl, [0, 255, 0, 255]);

var successfullyParsed = true;

</script>

<script src="../js/js-test-post.js"></script>

</body>

</html>