| <!-- |
| 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"> |
| <title>Scissor Rectangle Repeated Rendering Test</title> |
| <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> |
| </head> |
| <body> |
| <canvas id="example" width="128" height="128"></canvas> |
| <div id="description"></div> |
| <div id="console"></div> |
| <script> |
| "use strict"; |
| |
| description(); |
| debug('Regression test for <a href="https://code.google.com/p/chromium/issues/detail?id=778770">Chromium bug 778770</a>'); |
| |
| var wtu = WebGLTestUtils; |
| |
| // These context creation attributes are significant to reproduce the bug. |
| var gl = wtu.create3DContext("example", {alpha: false, antialias: false}); |
| |
| // Draw into the upper right quadrant. |
| var x = 64; |
| var y = 64; |
| var width = 64; |
| var height = 64; |
| |
| var numRenders = 10; |
| |
| function render() { |
| gl.viewport(x, y, width, height); |
| gl.scissor(x, y, width, height); |
| gl.enable(gl.SCISSOR_TEST); |
| gl.clearColor(0.0, 1.0, 0.0, 1.0); |
| gl.clear(gl.COLOR_BUFFER_BIT); |
| |
| // If anything but black is ever seen in the un-drawn region of |
| // the canvas, the test fails. |
| var black = [0, 0, 0, 255]; |
| wtu.checkCanvasRect(gl, 10, 10, 10, 10, black, "should be black", 1); |
| |
| if (--numRenders > 0) { |
| window.requestAnimationFrame(render); |
| } else { |
| finishTest(); |
| } |
| } |
| |
| window.requestAnimationFrame(render); |
| |
| var successfullyParsed = true; |
| </script> |
| </body> |
| </html> |
