| <!-- |
| 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"> |
| <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> |
| <script src="../../js/tests/canvas-tests-utils.js"></script> |
| <script> |
| function init() |
| { |
| description("Tests behavior under a lost context for OffscreenCanvas"); |
| |
| if (!window.OffscreenCanvas) { |
| testPassed("No OffscreenCanvas support"); |
| finishTest(); |
| return; |
| } |
| |
| canvas = new OffscreenCanvas(10, 10); |
| gl = canvas.getContext('webgl'); |
| |
| // call testValidContext() before checking for the extension, because this is where we check |
| // for the isContextLost() method, which we want to do regardless of the extension's presence. |
| if (!testValidContext()) { |
| testFailed("Some tests failed"); |
| finishTest(); |
| return; |
| } |
| |
| extension = gl.getExtension("WEBGL_lose_context"); |
| // need an extension that exposes new API methods. |
| OES_vertex_array_object = gl.getExtension("OES_vertex_array_object"); |
| if (extension == null || OES_vertex_array_object == null) { |
| testFailed("Some tests failed"); |
| finishTest(); |
| return; |
| } |
| |
| // We need to initialize |uniformLocation| before losing context. |
| // Otherwise gl.getUniform() when context is lost will throw. |
| uniformLocation = gl.getUniformLocation(program, "tex"); |
| extension.loseContext(); |
| |
| canvas.addEventListener("webglcontextlost", function() { |
| if (testLostContextWithoutRestore()) { |
| testPassed("All tests passed"); |
| finishTest(); |
| return; |
| } else { |
| testFailed("Some tests failed"); |
| finishTest(); |
| return; |
| } |
| }, false); |
| } |
| |
| </script> |
| </head> |
| <body onload="init()"> |
| <div id="description"></div> |
| <div id="console"></div> |
| </body> |
| </html> |
