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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">
<title>WebGL 2 Resizing With PBO Bound 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>
<div id="description"></div>
<canvas id="canvas1" style="width: 256px; height: 256px;"> </canvas>
<canvas id="canvas2" style="width: 256px; height: 256px;"> </canvas>
<div id="console"></div>
<script>
"use strict";
description("Verifies that resizing the canvas (recreating the backing framebuffer) works correctly while a PBO is bound.");
debug("");
debug("Regression test for Chromium <a href='https://bugs.chromium.org/p/chromium/issues/detail?id=644572'>Issue 644572</a>");
debug("");
var wtu = WebGLTestUtils;
var canvas;
var largeSize = 256;
var smallSize = 128;
var currentSize;
var gl;
var numFrames = 0;
var testNumber = 0;
var pbo;
function nextTest() {
++testNumber;
numFrames = 0;
currentSize = largeSize;
if (testNumber > 2) {
finishTest();
return;
}
canvas = document.getElementById("canvas" + testNumber);
canvas.width = currentSize;
canvas.height = currentSize;
var usePreserveDrawingBuffer = (testNumber == 1) ? true : false;
debug("Testing preserveDrawingBuffer = " + usePreserveDrawingBuffer);
gl = wtu.create3DContext(canvas, { preserveDrawingBuffer: usePreserveDrawingBuffer }, 2);
if (!gl) {
testFailed("context does not exist");
wtu.requestAnimFrame(nextTest);
} else {
testPassed("context exists");
gl.clearColor(0, 1, 0, 1);
pbo = gl.createBuffer();
gl.bindBuffer(gl.PIXEL_UNPACK_BUFFER, pbo);
wtu.requestAnimFrame(render);
}
}
function render() {
if (++numFrames < 4) {
if (currentSize == largeSize) {
canvas.height = smallSize;
currentSize = smallSize;
} else {
canvas.height = largeSize;
currentSize = largeSize;
}
}
gl.viewport(0, 0, largeSize, currentSize);
gl.clear(gl.COLOR_BUFFER_BIT);
// Check the four corners
var green = [ 0, 255, 0, 255 ];
var inset = 3;
wtu.checkCanvasRect(gl, inset, inset, 1, 1, green, "lower left should be green", 1);
wtu.checkCanvasRect(gl, largeSize - inset, inset, 1, 1, green, "lower right should be green", 1);
wtu.checkCanvasRect(gl, inset, currentSize - inset, 1, 1, green, "upper left should be green", 1);
wtu.checkCanvasRect(gl, largeSize - inset, currentSize - inset, 1, 1, green, "upper right should be green", 1);
wtu.glErrorShouldBe(gl, gl.NO_ERROR, "No GL error");
if (gl.getParameter(gl.PIXEL_UNPACK_BUFFER_BINDING) != pbo) {
testFailed("Pixel unpack buffer binding was lost");
}
if (numFrames < 4) {
wtu.requestAnimFrame(render);
} else {
wtu.requestAnimFrame(nextTest);
}
}
wtu.requestAnimFrame(nextTest);
</script>
</body>
</html>