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content / test / data / gpu / pixel_offscreenCanvas_webgl_paint_after_resize.html [blame]
<!DOCTYPE HTML>
<html>
<head>
<title>OffscreenCanvas webgl still updates after canvas resize.</title>
<style type="text/css">
.nomargin {
margin: 0px auto;
}
</style>
</head>
<body onload="main()">
<div id="container" style="position:absolute; top:0px; left:0px">
<canvas id="output" width="100" height="100" class="nomargin"></canvas>
</div>
<script>
// Correct end result of this test: A vertical green rectangle.
function main() {
var canvas = document.getElementById('output');
var offscreen = canvas.transferControlToOffscreen();
var gl = offscreen.getContext('webgl');
gl.clearColor(1.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
requestAnimationFrame(() => {
// nested rAF to ensure initial frame is pushed before resize attempt
requestAnimationFrame(() => {
offscreen.width = 50;
requestAnimationFrame(() => {
gl.clearColor(0.0, 1.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT);
waitForFinish();
});
});
});
}
var g_swapsBeforeAck = 15;
function waitForFinish()
{
if (g_swapsBeforeAck == 0) {
domAutomationController.send("SUCCESS");
} else {
g_swapsBeforeAck--;
requestAnimationFrame(waitForFinish);
}
}
</script>
</body>
</html>