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WebVR API Implementation, r=larsbergstrom
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Imanol Fernandez
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70 changed files with 13044 additions and 20 deletions
312
tests/html/webvr/dynamic-resolution.html
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312
tests/html/webvr/dynamic-resolution.html
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<!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>08 - Dynamic Resolution</title>
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<!--
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This sample demonstrates how to efficiently adjust the resolution of your
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WebVR scene on the fly using the layer bounds. Based off sample 4b.
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-->
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<style>
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body {
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background-color: black;
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}
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#canvas-clip, #webgl-canvas {
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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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#canvas-clip.presenting {
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overflow: hidden;
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bottom: 0;
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right: 0;
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margin: auto;
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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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<div id="canvas-clip">
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<canvas id="webgl-canvas"></canvas>
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</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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// WebVR-specific code begins here.
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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 canvasClip = document.getElementById("canvas-clip");
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var gl = null;
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var cubeSea = null;
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var stats = null;
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function initWebGL (preserveDrawingBuffer) {
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var glAttribs = {
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alpha: false,
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antialias: false, //!VRSamplesUtil.isMobile(),
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preserveDrawingBuffer: false //preserveDrawingBuffer
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};
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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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cubeSea = new VRCubeSea(gl, texture);
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stats = new WGLUStats(gl);
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window.addEventListener("resize", onResize, false);
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onResize();
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window.requestAnimationFrame(onAnimationFrame);
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}
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function onVRRequestPresent () {
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vrDisplay.requestPresent([{ source: webglCanvas }]).then(function () {
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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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if (!vrDisplay.isPresenting)
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return;
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resolutionMultiplier = 1.0;
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vrDisplay.exitPresent().then(function () {
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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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if (vrDisplay.isPresenting) {
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if (vrDisplay.capabilities.hasExternalDisplay) {
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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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canvasClip.classList.add("presenting");
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var leftEye = vrDisplay.getEyeParameters("left");
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canvasClip.style.width = (leftEye.renderWidth/2) + "px";
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canvasClip.style.height = (leftEye.renderHeight/2) + "px";
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}
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} else {
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if (vrDisplay.capabilities.hasExternalDisplay) {
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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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canvasClip.classList.remove("presenting");
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canvasClip.style.width = "";
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canvasClip.style.height = "";
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webglCanvas.style.width = "";
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webglCanvas.style.height = "";
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}
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}
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// Make sure the canvas is resized AFTER we've updated the container div.
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onResize();
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}
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if (navigator.vr) {
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frameData = new VRFrameData();
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navigator.vr.getDisplays().then(function (displays) {
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if (displays.length > 0) {
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vrDisplay = displays[0];
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VRSamplesUtil.addButton("Reset Pose", "R", null, function () { vrDisplay.resetPose(); });
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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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vrDisplay.addEventListener('presentchange', onVRPresentChange, false);
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//vrDisplay.addEventListener('activate', onVRRequestPresent, false);
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//vrDisplay.addEventListener('deactivate', onVRExitPresent, false);
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initWebGL(vrDisplay.capabilities.hasExternalDisplay);
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} else {
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initWebGL(false);
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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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initWebGL(false);
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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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initWebGL(false);
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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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// How
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function onResize () {
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if (vrDisplay && vrDisplay.isPresenting) {
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var leftEye = vrDisplay.getEyeParameters("left");
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var rightEye = vrDisplay.getEyeParameters("right");
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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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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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// How large our frame should be in relation to the recommended render
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// target size.
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var resolutionMultiplier = 1.0;
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var eyeWidth, eyeHeight;
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var lastAdjustment = 0;
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function adjustResolution(t) {
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// Update the resolution every quarter second
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if (t - lastAdjustment < 100)
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return;
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lastAdjustment = t;
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// Modify the resolution we are rendering at over time on a sin wave.
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// In the real world this would probably be based on scene complexity.
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// Oscillates between 1.0 to 0.5.
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resolutionMultiplier = (Math.sin(t / 1000) * 0.25) + 0.75;
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eyeWidth = webglCanvas.width * 0.5 * resolutionMultiplier;
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eyeHeight = webglCanvas.height * resolutionMultiplier;
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// Layer bounds are described in UV space, so 0.0 to 1.0
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var boundsWidth = 0.5 * resolutionMultiplier;
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var boundsHeight = resolutionMultiplier;
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// Tell the presenting display about the new texture bounds. This
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// ensures it only picks up the parts of the texture we're going to be
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// rendering to and avoids the need to resize the WebGL canvas, which
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// can be a slow operation. Because we're already presenting when we
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// call requestPresent again it only updates the VRLayer information and
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// doesn't require a user gesture.
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vrDisplay.requestPresent([{
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source: webglCanvas,
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leftBounds: [0.0, 0.0, boundsWidth, boundsHeight],
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rightBounds: [boundsWidth, 0.0, boundsWidth, boundsHeight],
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}]);
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// To ensure our mirrored content also shows up correctly we'll scale
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// the canvas display size to be scaled appropriately such that it
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// continues to only show one eye.
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webglCanvas.style.width = (1.0/resolutionMultiplier) * 200 + "%";
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webglCanvas.style.height = (1.0/resolutionMultiplier) * 100 + "%";
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//webglCanvas.style.marginTop = ((eyeHeight - webglCanvas.height)* resolutionMultiplier) + "px";
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}
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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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vrDisplay.requestAnimationFrame(onAnimationFrame);
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vrDisplay.getFrameData(frameData);
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if (vrDisplay.isPresenting) {
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adjustResolution(t);
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// Note that the viewports use the eyeWidth/height rather than the
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// canvas width and height.
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gl.viewport(0, webglCanvas.height-eyeHeight, eyeWidth, eyeHeight);
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cubeSea.render(frameData.leftProjectionMatrix, frameData.leftViewMatrix, stats);
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gl.viewport(eyeWidth, webglCanvas.height-eyeHeight, eyeWidth, eyeHeight);
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cubeSea.render(frameData.rightProjectionMatrix, frameData.rightViewMatrix, stats);
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vrDisplay.submitFrame();
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} else {
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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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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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})();
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</script>
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</body>
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</html>
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