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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>WebGL required buffer clear behaviour test</title>
<link rel="stylesheet" href="../../resources/js-test-style.css"/>
<script src="../../resources/js-test-pre.js"></script>
<script src="../resources/webgl-test.js"> </script>
<script src="../resources/webgl-test-utils.js"> </script>
<style type="text/css">
body {
height: 3000px;
}
</style>
<script type="text/javascript">
var iter = 0;
var gl1;
var gl2;
var wtu = WebGLTestUtils;
function timer() {
if (iter == 0) {
// some random hacky stuff to make sure that we get a compositing step
window.scrollBy(0, 10);
window.scrollBy(0, -10);
iter++;
setTimeout(timer, 500);
} else if (iter == 1) {
function clear(gl) {
// scissor was set earlier
gl.clearColor(0, 0, 1, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
}
clear(gl1);
clear(gl2);
debug("check on screen canvas");
wtu.checkCanvasRect(gl1, 0, 10, 10, 10, [0, 0, 255, 255], "cleared corner should be blue, stencil should be preserved");
wtu.checkCanvasRect(gl1, 0, 0, 10, 10, [0, 0, 0, 0], "remainder of buffer should be cleared");
debug("check off screen canvas");
wtu.checkCanvasRect(gl2, 0, 10, 10, 10, [0, 0, 255, 255], "cleared corner should be blue, stencil should be preserved");
wtu.checkCanvasRect(gl2, 0, 0, 10, 10, [255, 0, 0, 255], "remainder of buffer should be un-cleared red");
finishTest();
}
}
function go() {
description("This test ensures WebGL implementations correctly clear the drawing buffer on composite if preserveDrawingBuffer is false.");
debug("");
gl1 = wtu.create3DContext("c");
gl2 = create3DContext();
shouldBeTrue("gl1 != null");
shouldBeTrue("gl2 != null");
shouldBeTrue('gl1.getContextAttributes().preserveDrawingBuffer == false');
shouldBeTrue('gl2.getContextAttributes().preserveDrawingBuffer == false');
function init(gl) {
gl.clearColor(1, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
// enable scissor here, before compositing, to make sure it's correctly
// ignored and restored
gl.scissor(0, 10, 10, 10);
gl.enable(gl.SCISSOR_TEST);
}
init(gl1);
init(gl2);
setTimeout(timer, 500);
}
window.addEventListener("load", go, false);
successfullyParsed = true;
</script>
</head>
<body>
<div id="description"></div>
<canvas width="20" height="20" style="border: 1px solid blue;" id="c"></canvas>
<div id="console"></div>
</body>
</html>
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