| <!DOCTYPE html> |
| <html> |
| <head> |
| <style type="text/css" media="screen"> |
| canvas { |
| margin: 20px; |
| width: 200px; |
| height: 200px; |
| padding: 0 0; |
| } |
| .border { |
| border: 1px solid black; |
| } |
| </style> |
| <script src="../../resources/run-after-layout-and-paint.js"></script> |
| <script> |
| function initWebGL() |
| { |
| var canvas = document.getElementById('canvas'); |
| var gl = canvas.getContext("webgl", {'antialias': false}); |
| if (!gl) { |
| alert("No WebGL context found"); |
| return null; |
| } |
| |
| return gl; |
| } |
| |
| var gl = null; |
| |
| function init() |
| { |
| gl = initWebGL(); |
| gl.viewport(0, 0, 200, 200); |
| gl.clearColor(1, 0, 0, 1); // red |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| runAfterLayoutAndPaint(drawGreen, true); |
| } |
| |
| function drawGreen() |
| { |
| gl.clearColor(0, 1, 0, 1); // green |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| if (!window.testRunner) { |
| window.setInterval(function() { |
| document.getElementById('canvas').classList.toggle('border'); |
| }, 50); |
| } |
| } |
| |
| </script> |
| </head> |
| <body onload="init()"> |
| <canvas id="canvas" width="200" height="200"></canvas> |
| </body> |
| </html> |
