scissor-rect-repeated-rendering.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.

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<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>Scissor Rectangle Repeated Rendering 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="example" width="128" height="128"></canvas>

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

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

<script>

"use strict";

description();

debug('Regression test for <a href="https://code.google.com/p/chromium/issues/detail?id=778770">Chromium bug 778770</a>');

var wtu = WebGLTestUtils;

// These context creation attributes are significant to reproduce the bug.

var gl = wtu.create3DContext("example", {alpha: false, antialias: false});

// Draw into the upper right quadrant.

var x      = 64;

var y      = 64;

var width  = 64;

var height = 64;

var numRenders = 10;

function render() {

    gl.viewport(x, y, width, height);

    gl.scissor(x, y, width, height);

    gl.enable(gl.SCISSOR_TEST);

    gl.clearColor(0.0, 1.0, 0.0, 1.0);

    gl.clear(gl.COLOR_BUFFER_BIT);

    // If anything but black is ever seen in the un-drawn region of

    // the canvas, the test fails.

    var black = [0, 0, 0, 255];

    wtu.checkCanvasRect(gl, 10, 10, 10, 10, black, "should be black", 1);

    if (--numRenders > 0) {

        window.requestAnimationFrame(render);

    } else {

        finishTest();

window.requestAnimationFrame(render);

var successfullyParsed = true;

</script>

</body>

</html>