gl-vertex-attrib-context-switch.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

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<!DOCTYPE html>

<html>

  <head>

<meta charset="utf-8">

    <title>WebGL Vertex Attrib Context Switch Test</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>

</head>

<body>

<canvas id="one" width="50" height="50">

</canvas>

<canvas id="two" width="50" height="50">

</canvas>

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

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

<script>

"use strict";

description("tests that vertex attrib value is preserved across context switches");

var wtu = WebGLTestUtils;

var positionLocation = 0;

var colorLocation = 1;

var gridRes = 1;

var canvas1 = document.getElementById("one");

var gl1 = wtu.create3DContext(canvas1);

var program1 = wtu.setupSimpleVertexColorProgram(gl1, positionLocation, colorLocation);

gl1.vertexAttrib4f(colorLocation, 0.0, 1.0, 0.0, 1.0);

wtu.setupIndexedQuad(gl1, gridRes, positionLocation);

wtu.clearAndDrawIndexedQuad(gl1, gridRes);

wtu.checkCanvas(gl1, [0, 255, 0, 255], "should be green 1");

var canvas2 = document.getElementById("two");

var gl2 = wtu.create3DContext(canvas2);

var program2 = wtu.setupSimpleVertexColorProgram(gl2, positionLocation, colorLocation);

wtu.setupIndexedQuad(gl2, gridRes, positionLocation);

wtu.clearAndDrawIndexedQuad(gl2, gridRes);

wtu.checkCanvas(gl2, [0, 0, 0, 255], "should be black 1");

wtu.checkCanvas(gl1, [0, 255, 0, 255], "should be green 2");

wtu.clearAndDrawIndexedQuad(gl2, gridRes);

wtu.checkCanvas(gl2, [0, 0, 0, 255], "should be black 2");

wtu.clearAndDrawIndexedQuad(gl1, gridRes);

wtu.checkCanvas(gl1, [0, 255, 0, 255], "should be green 3");

var successfullyParsed = true;

</script>

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

</body>

</html>