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307 lines
12 KiB
HTML
307 lines
12 KiB
HTML
<!doctype html>
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<!--
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Copyright 2016 The Chromium Authors. All rights reserved.
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Use of this source code is governed by a BSD-style license that can be
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found in the LICENSE file.
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-->
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
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<meta name="mobile-web-app-capable" content="yes">
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<meta name="apple-mobile-web-app-capable" content="yes">
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<title>03 - VR Presentation</title>
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<!--
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This sample demonstrates how to present the contents of a WebGL canvas to
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a VRDisplay. The content is not mirrored on the main display while being
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presented.
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-->
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<style>
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#webgl-canvas, #presenting-message {
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box-sizing: border-box;
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height: 100%;
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left: 0;
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margin: 0;
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position: absolute;
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top: 0;
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width: 100%;
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}
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#presenting-message {
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color: white;
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font-family: sans-serif;
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font-size: 2em;
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font-weight: bold;
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z-index: 1;
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text-align: center;
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padding: 0.5em;
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background-color: #444;
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display: none;
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}
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</style>
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<!-- This entire block in only to facilitate dynamically enabling and
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disabling the WebVR polyfill, and is not necessary for most WebVR apps.
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If you want to use the polyfill in your app, just include the js file and
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everything will work the way you want it to by default. -->
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<script>
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var WebVRConfig = {
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// Prevents the polyfill from initializing automatically.
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DEFER_INITIALIZATION: true,
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// Polyfill optimizations
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DIRTY_SUBMIT_FRAME_BINDINGS: true,
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BUFFER_SCALE: 0.75,
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};
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</script>
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<script src="js/third-party/webvr-polyfill.js"></script>
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<script src="js/third-party/wglu/wglu-url.js"></script>
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<script>
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// Dynamically turn the polyfill on if requested by the query args.
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if (WGLUUrl.getBool('polyfill', false)) {
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InitializeWebVRPolyfill();
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} else {
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// Shim for migration from older version of WebVR. Shouldn't be necessary for very long.
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InitializeSpecShim();
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}
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</script>
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<!-- End sample polyfill enabling logic -->
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<script src="js/third-party/gl-matrix-min.js"></script>
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<script src="js/third-party/wglu/wglu-program.js"></script>
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<script src="js/third-party/wglu/wglu-stats.js"></script>
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<script src="js/third-party/wglu/wglu-texture.js"></script>
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<script src="js/vr-cube-sea.js"></script>
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<script src="js/vr-samples-util.js"></script>
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</head>
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<body>
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<canvas id="webgl-canvas"></canvas>
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<div id="presenting-message">Put on your headset now</div>
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<script>
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/* global mat4, VRCubeSea, WGLUStats, WGLUTextureLoader, VRSamplesUtil */
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(function () {
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"use strict";
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var vrDisplay = null;
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var frameData = null;
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var projectionMat = mat4.create();
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var viewMat = mat4.create();
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var vrPresentButton = null;
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// ===================================================
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// WebGL scene setup. This code is not WebVR specific.
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// ===================================================
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// WebGL setup.
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var webglCanvas = document.getElementById("webgl-canvas");
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var glAttribs = {
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alpha: false,
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antialias: false //!VRSamplesUtil.isMobile()
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};
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var gl = webglCanvas.getContext("webgl", glAttribs);
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if (!gl) {
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gl = webglCanvas.getContext("experimental-webgl", glAttribs);
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if (!gl) {
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VRSamplesUtil.addError("Your browser does not support WebGL.");
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return;
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}
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}
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gl.clearColor(0.1, 0.2, 0.3, 1.0);
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gl.enable(gl.DEPTH_TEST);
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gl.enable(gl.CULL_FACE);
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var textureLoader = new WGLUTextureLoader(gl);
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var texture = textureLoader.loadTexture("media/textures/cube-sea.png");
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var cubeSea = new VRCubeSea(gl, texture);
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var stats = new WGLUStats(gl);
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var presentingMessage = document.getElementById("presenting-message");
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// ================================
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// WebVR-specific code begins here.
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// ================================
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function onVRRequestPresent () {
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// This can only be called in response to a user gesture.
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vrDisplay.requestPresent([{ source: webglCanvas }]).then(function () {
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onVRPresentChange();
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// Nothing to do because we're handling things in onVRPresentChange.
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}, function () {
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VRSamplesUtil.addError("requestPresent failed.", 2000);
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});
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}
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function onVRExitPresent () {
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// No sense in exiting presentation if we're not actually presenting.
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// (This may happen if we get an event like vrdisplaydeactivate when
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// we weren't presenting.)
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if (!vrDisplay.isPresenting)
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return;
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vrDisplay.exitPresent().then(function () {
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// Nothing to do because we're handling things in onVRPresentChange.
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}, function () {
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VRSamplesUtil.addError("exitPresent failed.", 2000);
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});
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}
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function onVRPresentChange () {
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// When we begin or end presenting, the canvas should be resized to the
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// recommended dimensions for the display.
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onResize();
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if (vrDisplay.isPresenting) {
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if (vrDisplay.capabilities.hasExternalDisplay) {
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// Because we're not mirroring any images on an external screen will
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// freeze while presenting. It's better to replace it with a message
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// indicating that content is being shown on the VRDisplay.
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presentingMessage.style.display = "block";
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// On devices with an external display the UA may not provide a way
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// to exit VR presentation mode, so we should provide one ourselves.
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VRSamplesUtil.removeButton(vrPresentButton);
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vrPresentButton = VRSamplesUtil.addButton("Exit VR", "E", "media/icons/cardboard64.png", onVRExitPresent);
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}
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} else {
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// If we have an external display take down the presenting message and
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// change the button back to "Enter VR".
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if (vrDisplay.capabilities.hasExternalDisplay) {
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presentingMessage.style.display = "";
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VRSamplesUtil.removeButton(vrPresentButton);
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vrPresentButton = VRSamplesUtil.addButton("Enter VR", "E", "media/icons/cardboard64.png", onVRRequestPresent);
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}
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}
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}
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if (navigator.getVRDisplays) {
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frameData = new VRFrameData();
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navigator.getVRDisplays().then(function (displays) {
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if (displays.length > 0) {
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vrDisplay = displays[0];
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// It's heighly reccommended that you set the near and far planes to
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// something appropriate for your scene so the projection matricies
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// WebVR produces have a well scaled depth buffer.
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vrDisplay.depthNear = 0.1;
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vrDisplay.depthFar = 1024.0;
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VRSamplesUtil.addButton("Reset Pose", "R", null, function () { vrDisplay.resetPose(); });
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// Generally, you want to wait until VR support is confirmed and
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// you know the user has a VRDisplay capable of presenting connected
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// before adding UI that advertises VR features.
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if (vrDisplay.capabilities.canPresent)
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vrPresentButton = VRSamplesUtil.addButton("Enter VR", "E", "media/icons/cardboard64.png", onVRRequestPresent);
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// The UA may kick us out of VR present mode for any reason, so to
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// ensure we always know when we begin/end presenting we need to
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// listen for vrdisplaypresentchange events.
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window.addEventListener('vrdisplaypresentchange', onVRPresentChange, false);
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// These events fire when the user agent has had some indication that
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// it would be appropariate to enter or exit VR presentation mode, such
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// as the user putting on a headset and triggering a proximity sensor.
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// You can inspect the `reason` property of the event to learn why the
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// event was fired, but in this case we're going to always trust the
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// event and enter or exit VR presentation mode when asked.
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window.addEventListener('vrdisplayactivate', onVRRequestPresent, false);
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window.addEventListener('vrdisplaydeactivate', onVRExitPresent, false);
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} else {
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VRSamplesUtil.addInfo("WebVR supported, but no VRDisplays found.", 3000);
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}
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});
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} else if (navigator.getVRDevices) {
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VRSamplesUtil.addError("Your browser supports WebVR but not the latest version. See <a href='http://webvr.info'>webvr.info</a> for more info.");
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} else {
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VRSamplesUtil.addError("Your browser does not support WebVR. See <a href='http://webvr.info'>webvr.info</a> for assistance.");
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}
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function onResize () {
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if (vrDisplay && vrDisplay.isPresenting) {
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// If we're presenting we want to use the drawing buffer size
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// recommended by the VRDevice, since that will ensure the best
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// results post-distortion.
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var leftEye = vrDisplay.getEyeParameters("left");
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var rightEye = vrDisplay.getEyeParameters("right");
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// For simplicity we're going to render both eyes at the same size,
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// even if one eye needs less resolution. You can render each eye at
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// the exact size it needs, but you'll need to adjust the viewports to
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// account for that.
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webglCanvas.width = Math.max(leftEye.renderWidth, rightEye.renderWidth) * 2;
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webglCanvas.height = Math.max(leftEye.renderHeight, rightEye.renderHeight);
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} else {
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// We only want to change the size of the canvas drawing buffer to
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// match the window dimensions when we're not presenting.
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webglCanvas.width = window.innerWidth * window.devicePixelRatio * 2;
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webglCanvas.height = window.innerHeight * window.devicePixelRatio * 2;
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}
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}
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window.addEventListener("resize", onResize, false);
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onResize();
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function onAnimationFrame (t) {
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stats.begin();
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gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
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if (vrDisplay) {
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// When presenting content to the VRDisplay we want to update at its
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// refresh rate if it differs from the refresh rate of the main
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// display. Calling VRDisplay.requestAnimationFrame ensures we render
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// at the right speed for VR.
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vrDisplay.requestAnimationFrame(onAnimationFrame);
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// As a general rule you want to get the pose as late as possible
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// and call VRDisplay.submitFrame as early as possible after
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// retrieving the pose. Do any work for the frame that doesn't need
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// to know the pose earlier to ensure the lowest latency possible.
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//var pose = vrDisplay.getPose();
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vrDisplay.getFrameData(frameData);
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if (vrDisplay.isPresenting) {
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// When presenting render a stereo view.
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gl.viewport(0, 0, webglCanvas.width * 0.5, webglCanvas.height);
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cubeSea.render(frameData.leftProjectionMatrix, frameData.leftViewMatrix, stats);
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gl.viewport(webglCanvas.width * 0.5, 0, webglCanvas.width * 0.5, webglCanvas.height);
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cubeSea.render(frameData.rightProjectionMatrix, frameData.rightViewMatrix, stats);
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// If we're currently presenting to the VRDisplay we need to
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// explicitly indicate we're done rendering.
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vrDisplay.submitFrame();
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} else {
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// When not presenting render a mono view that still takes pose into
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// account.
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gl.viewport(0, 0, webglCanvas.width, webglCanvas.height);
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// It's best to use our own projection matrix in this case, but we can use the left eye's view matrix
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mat4.perspective(projectionMat, Math.PI*0.4, webglCanvas.width / webglCanvas.height, 0.1, 1024.0);
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cubeSea.render(projectionMat, frameData.leftViewMatrix, stats);
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stats.renderOrtho();
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}
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} else {
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window.requestAnimationFrame(onAnimationFrame);
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// No VRDisplay found.
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gl.viewport(0, 0, webglCanvas.width, webglCanvas.height);
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mat4.perspective(projectionMat, Math.PI*0.4, webglCanvas.width / webglCanvas.height, 0.1, 1024.0);
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mat4.identity(viewMat);
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cubeSea.render(projectionMat, viewMat, stats);
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stats.renderOrtho();
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}
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stats.end();
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}
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window.requestAnimationFrame(onAnimationFrame);
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})();
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</script>
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</body>
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</html>
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