2 Copyright (c) 2019 The Khronos Group Inc.
3 Use of this source code is governed by an MIT-style license that can be
4 found in the LICENSE.txt file.
7 importScripts("../../js/tests/canvas-tests-utils.js");
8 self.onmessage = function(e) {
9 canvas = new OffscreenCanvas(10, 10);
10 gl = canvas.getContext('webgl');
12 // call testValidContext() before checking for the extension, because this is where we check
13 // for the isContextLost() method, which we want to do regardless of the extension's presence.
14 self.postMessage({fail: !testValidContext(), msg: "testValidContext()"});
16 WEBGL_lose_context = gl.getExtension("WEBGL_lose_context");
17 self.postMessage({fail: !WEBGL_lose_context, msg: "WEBGL_lose_context"});
19 // need an extension that exposes new API methods.
20 OES_vertex_array_object = gl.getExtension("OES_vertex_array_object");
21 self.postMessage({fail: !OES_vertex_array_object, msg: "OES_vertex_array_object"});
23 // We need to initialize |uniformLocation| before losing context.
24 // Otherwise gl.getUniform() when context is lost will throw.
25 uniformLocation = gl.getUniformLocation(program, "tex");
26 WEBGL_lose_context.loseContext();
28 canvas.addEventListener("webglcontextlost", function() {
29 self.postMessage({fail: !testLostContextWithoutRestore(), msg: "testLostContextWithoutRestore()",