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comparison: content/canvas/test/reftest/webgl-disable-test.html
content/canvas/test/reftest/webgl-disable-test.html
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| -1:000000000000 | 0:3dfa4c8ab50b |
|---|---|
| 1 <!DOCTYPE html> | |
| 2 <html class="reftest-wait"> | |
| 3 <head> | |
| 4 <meta charset="UTF-8"> | |
| 5 | |
| 6 <script type="text/javascript" src="webgl-utils.js"></script> | |
| 7 <script type="text/javascript"> | |
| 8 /* Disable Test | |
| 9 * | |
| 10 * If we succeed in getting a WebGL context, we will fill | |
| 11 * the canvas with red. If we fail to acquire a WebGL context, | |
| 12 * we will use Canvas2D to instead fill it with green. | |
| 13 * | |
| 14 * Note that this test differs from the others in that | |
| 15 * it will draw differently if it receives a WebGL context. | |
| 16 * Other tests are designed to fallback silently to Canvas2D. | |
| 17 * | |
| 18 * We use this test to assure that when we disable WebGL, | |
| 19 * WebGL does not function. This is trivially true for systems | |
| 20 * that don't support WebGL. This test is not viable for testing | |
| 21 * that WebGL works, as blocklisted systems will always draw green. | |
| 22 */ | |
| 23 | |
| 24 "use strict"; | |
| 25 | |
| 26 function renderGL(gl) { | |
| 27 gl.clearColor(1.0, 0.0, 0.0, 1.0); | |
| 28 gl.clear(gl.COLOR_BUFFER_BIT); | |
| 29 gl.finish(); | |
| 30 } | |
| 31 | |
| 32 function renderBackup(canvas) { | |
| 33 var context = canvas.getContext("2d"); | |
| 34 context.fillStyle = "rgba(0, 255, 0, 1.0)"; | |
| 35 context.fillRect(0, 0, 256, 256); | |
| 36 } | |
| 37 | |
| 38 function runTest() { | |
| 39 var canvas = document.getElementById("canvas"); | |
| 40 var gl = initGL(canvas); | |
| 41 | |
| 42 if (gl) | |
| 43 renderGL(gl); | |
| 44 else | |
| 45 renderBackup(canvas); | |
| 46 | |
| 47 waitForComposite(testComplete); | |
| 48 } | |
| 49 | |
| 50 function testComplete() { | |
| 51 document.documentElement.removeAttribute("class"); | |
| 52 } | |
| 53 </script> | |
| 54 </head> | |
| 55 | |
| 56 <body onload="rAF(runTest);"> | |
| 57 <canvas id="canvas" width="256" height="256"></canvas> | |
| 58 </body> | |
| 59 | |
| 60 </html> |
