video_to_sub_texture.html | Explore in Territory

<!DOCTYPE html>
<html>
<body>
<video id="video" muted="muted" loop></video>
<script src="resources/canvas_runner.js"></script>
<script>
var videoElement = document.getElementById("video");
var canvas3D = document.createElement('canvas');
var gl = canvas3D.getContext('webgl');
document.body.appendChild(canvas3D);

if(!gl) {
    console.logFatalError("WebGL is not supported or enabled on this platform!");
    throw "WebGL is not supported or enabled on this platform!";
}

function setSize(width, height) {
    canvas3D.width = width;
    canvas3D.height = height;
}

function getArgValue(argname) {
    const queryString = window.location.search;
    const urlParams = new URLSearchParams(queryString);
    var result = urlParams.get(argname);
    if (!result) {
      return false;
    }
    return result === "true";
}

function startPerfTest() {
    preRun();
    perfTest();
}

function perfTest() {
    gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, flipY);
    gl.pixelStorei(gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, premultiply);
    gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, gl.RGBA, gl.UNSIGNED_BYTE, videoElement);
    gl.readPixels(0, 0, 1, 1, gl.RGBA, gl.UNSIGNED_BYTE, new Uint8Array(4));
    requestAnimationFrame(perfTest);
}

var flipY = false;
var premultiply = false;
var tex = null;

function preRun() {
    tex = gl.createTexture();
    gl.bindTexture(gl.TEXTURE_2D, tex);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, videoElement.videoWidth, videoElement.videoHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
    flipY = getArgValue('flip_y');
    premultiply = getArgValue('premult');
}

window.onload = function () {
    setSize(1, 1);

    videoElement.src = "resources/crowd1080.webm";
    if(!videoElement.canPlayType('video/webm').replace(/no/, '')) {
        console.logFatalError("video/webm is unsupported");
        throw 'video/webm is unsupported';
    };
    CanvasRunner.startPlayingAndWaitForVideo(videoElement, startPerfTest);
}

</script>
</body>
</html>
chromium/tools/perf/page_sets/simple_canvas/video_to_sub_texture.html
