<!--
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>Stresses the camera-to-texture upload path.</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>
<div id="console"></div>
<canvas id="canvas" width="640" height="360">
</canvas>
<script>
"use strict";
description();

debug("Repeatedly uploads from a camera video element to a texture, many times per frame.")

const wtu = WebGLTestUtils;
const gl = wtu.create3DContext(document.getElementById('canvas'));
const video = document.createElement('video');
video.src = '';
video.loop = false;
video.muted = true;
video.setAttribute('playsinline', '');

const program = wtu.setupTexturedQuad(gl);
const textureLoc = gl.getUniformLocation(program, "tex");
gl.uniform1i(textureLoc, 0);

const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);

navigator.mediaDevices.getUserMedia({
        audio: false,
        video: {
            facingMode: 'environment',
            width: 1280,
            height: 720,
        }
    })
    .then(mediaStream => {
        video.srcObject = mediaStream;
        video.onloadedmetadata = () => {
            wtu.startPlayingAndWaitForVideo(video, startTestLoop);
        };
    });

const urlOptions = wtu.getUrlOptions();
const uploadsPerFrame = urlOptions.uploadsPerFrame ? urlOptions.uploadsPerFrame : 400;
debug('');
debug(`Testing with ${uploadsPerFrame} uploads per frame`);

function startTestLoop() {
    requestAnimationFrame(startTestLoop);
    for (let i = 0; i < uploadsPerFrame; ++i) {
        gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, gl.RGB, gl.UNSIGNED_BYTE, video);
    }
    wtu.clearAndDrawUnitQuad(gl);
}

var successfullyParsed = true;
</script>

</body>
</html>
