| <!DOCTYPE HTML> |
| <html> |
| <head> |
| <meta name="viewport" content="initial-scale=1"> |
| <title>Video Context Loss Test</title> |
| <style type="text/css"> |
| .nomargin { |
| margin: 0px auto; |
| } |
| </style> |
| <script> |
| var video; |
| |
| var QueryString = function() { |
| // Allows access to query parameters on the URL; e.g., given a URL like: |
| // http://<server>/my.html?test=123&bob=123 |
| // Parameters can then be accessed via QueryString.test or QueryString.bob. |
| var params = {}; |
| // RegEx to split out values by &. |
| var r = /([^&=]+)=?([^&]*)/g; |
| // Lambda function for decoding extracted match values. Replaces '+' with |
| // space so decodeURIComponent functions properly. |
| function d(s) { return decodeURIComponent(s.replace(/\+/g, ' ')); } |
| var match; |
| while (match = r.exec(window.location.search.substring(1))) |
| params[d(match[1])] = d(match[2]); |
| return params; |
| }(); |
| |
| function CrashGpuProcess() { |
| // Ensure we only get one crash in case of multiple canplaythrough events. |
| video.removeEventListener('canplaythrough', CrashGpuProcess, false); |
| |
| // Create a canvas element and webgl context -- without a context, we won't |
| // get a webglcontextlost event. |
| var canvas = document.createElement('canvas'); |
| var gl = canvas.getContext('webgl'); |
| |
| // webglcontextlost may not be invoked unless we actually try to execute a GL |
| // command, so use a repeating function to tickle the context. |
| var tickle = setInterval(function() { gl.getParameter(gl.VERSION); }, 250); |
| |
| // Now wait for the context loss before starting video playback. |
| canvas.addEventListener('webglcontextlost', function(e) { |
| clearInterval(tickle); |
| |
| // Now wait for the video to play until the end, by which point a frame |
| // should be visible on screen. |
| video.addEventListener('ended', function(e) { |
| domAutomationController.send('SUCCESS'); |
| }, false); |
| video.play(); |
| }, false); |
| |
| // Invokes chrome://gpucrash, which triggers a webglcontextlost event above. |
| chrome.gpuBenchmarking.crashGpuProcess(); |
| } |
| |
| function Main() { |
| video = document.getElementById('video'); |
| |
| // Wait until we're sure a frame has been displayed before crashing GPU. |
| video.addEventListener('canplaythrough', CrashGpuProcess, false); |
| |
| // Add an error listener to avoid timeouts if playback fails. |
| video.addEventListener('error', function(e) { |
| console.log('Video playback failed: ' + e.code + ', "' + e.message + '"'); |
| domAutomationController.send('ERROR'); |
| }, false); |
| |
| // We set a poster and preload=metadata to ensure that no frames are decoded |
| // before the gpu crash -- otherwise the media pipeline can't guarantee that |
| // we'll fall over to the software decoder. |
| video.poster = 'single_face.jpg'; |
| video.preload = 'metadata'; |
| |
| // src needs to be set after listeners are added. |
| video.src = QueryString.src; |
| } |
| </script> |
| </head> |
| <body onload="Main()"> |
| <div id="container" style="position:absolute; top:0px; left:0px"> |
| <video class="nomargin" id="video" width="240" height="135"></video> |
| </div> |
| </body> |
| </html> |
